// Copyright 2020-2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

/* eslint-disable no-nested-ternary */
/* eslint-disable camelcase */
/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
/* eslint-disable no-restricted-syntax */
/* eslint-disable no-console */
/* eslint-disable @typescript-eslint/no-explicit-any */

import { join } from 'path';
import mkdirp from 'mkdirp';
import rimraf from 'rimraf';
import SQL, { Database, Statement } from 'better-sqlite3';

import { v4 as generateUUID } from 'uuid';
import {
  Dictionary,
  forEach,
  fromPairs,
  isNil,
  isNumber,
  isString,
  keyBy,
  last,
  map,
  pick,
  omit,
} from 'lodash';

import { assert } from '../util/assert';
import { isNormalNumber } from '../util/isNormalNumber';
import { combineNames } from '../util/combineNames';

import { GroupV2MemberType } from '../model-types.d';

import {
  AttachmentDownloadJobType,
  ConversationMetricsType,
  ConversationType,
  EmojiType,
  IdentityKeyType,
  ItemType,
  MessageType,
  MessageTypeUnhydrated,
  MessageMetricsType,
  PreKeyType,
  SearchResultMessageType,
  ServerInterface,
  SessionType,
  SignedPreKeyType,
  StickerPackStatusType,
  StickerPackType,
  StickerType,
  UnprocessedType,
} from './Interface';

declare global {
  // We want to extend `Function`'s properties, so we need to use an interface.
  // eslint-disable-next-line no-restricted-syntax
  interface Function {
    needsSerial?: boolean;
  }
}

type JSONRows = Array<{ readonly json: string }>;
type ConversationRow = Readonly<{
  json: string;
  profileLastFetchedAt: null | number;
}>;
type ConversationRows = Array<ConversationRow>;

type EmptyQuery = [];
type ArrayQuery = Array<Array<null | number | string>>;
type Query = { [key: string]: null | number | string };

// Because we can't force this module to conform to an interface, we narrow our exports
//   to this one default export, which does conform to the interface.
// Note: In Javascript, you need to access the .default property when requiring it
// https://github.com/microsoft/TypeScript/issues/420
const dataInterface: ServerInterface = {
  close,
  removeDB,
  removeIndexedDBFiles,

  createOrUpdateIdentityKey,
  getIdentityKeyById,
  bulkAddIdentityKeys,
  removeIdentityKeyById,
  removeAllIdentityKeys,
  getAllIdentityKeys,

  createOrUpdatePreKey,
  getPreKeyById,
  bulkAddPreKeys,
  removePreKeyById,
  removeAllPreKeys,
  getAllPreKeys,

  createOrUpdateSignedPreKey,
  getSignedPreKeyById,
  getAllSignedPreKeys,
  bulkAddSignedPreKeys,
  removeSignedPreKeyById,
  removeAllSignedPreKeys,

  createOrUpdateItem,
  getItemById,
  getAllItems,
  bulkAddItems,
  removeItemById,
  removeAllItems,

  createOrUpdateSession,
  createOrUpdateSessions,
  getSessionById,
  getSessionsById,
  bulkAddSessions,
  removeSessionById,
  removeSessionsByConversation,
  removeAllSessions,
  getAllSessions,

  getConversationCount,
  saveConversation,
  saveConversations,
  getConversationById,
  updateConversation,
  updateConversations,
  removeConversation,
  eraseStorageServiceStateFromConversations,
  getAllConversations,
  getAllConversationIds,
  getAllPrivateConversations,
  getAllGroupsInvolvingId,

  searchConversations,
  searchMessages,
  searchMessagesInConversation,

  getMessageCount,
  saveMessage,
  saveMessages,
  removeMessage,
  removeMessages,
  getUnreadByConversation,
  getMessageBySender,
  getMessageById,
  _getAllMessages,
  getAllMessageIds,
  getMessagesBySentAt,
  getExpiredMessages,
  getOutgoingWithoutExpiresAt,
  getNextExpiringMessage,
  getNextTapToViewMessageToAgeOut,
  getTapToViewMessagesNeedingErase,
  getOlderMessagesByConversation,
  getNewerMessagesByConversation,
  getMessageMetricsForConversation,
  getLastConversationActivity,
  getLastConversationPreview,
  hasGroupCallHistoryMessage,
  migrateConversationMessages,

  getUnprocessedCount,
  getAllUnprocessed,
  saveUnprocessed,
  updateUnprocessedAttempts,
  updateUnprocessedWithData,
  updateUnprocessedsWithData,
  getUnprocessedById,
  saveUnprocesseds,
  removeUnprocessed,
  removeAllUnprocessed,

  getNextAttachmentDownloadJobs,
  saveAttachmentDownloadJob,
  setAttachmentDownloadJobPending,
  resetAttachmentDownloadPending,
  removeAttachmentDownloadJob,
  removeAllAttachmentDownloadJobs,

  createOrUpdateStickerPack,
  updateStickerPackStatus,
  createOrUpdateSticker,
  updateStickerLastUsed,
  addStickerPackReference,
  deleteStickerPackReference,
  getStickerCount,
  deleteStickerPack,
  getAllStickerPacks,
  getAllStickers,
  getRecentStickers,
  clearAllErrorStickerPackAttempts,

  updateEmojiUsage,
  getRecentEmojis,

  removeAll,
  removeAllConfiguration,

  getMessagesNeedingUpgrade,
  getMessagesWithVisualMediaAttachments,
  getMessagesWithFileAttachments,

  // Server-only

  initialize,
  initializeRenderer,

  removeKnownAttachments,
  removeKnownStickers,
  removeKnownDraftAttachments,
};
export default dataInterface;

type DatabaseQueryCache = Map<string, Statement<any[]>>;

const statementCache = new WeakMap<Database, DatabaseQueryCache>();

function prepare(db: Database, query: string): Statement<Query> {
  let dbCache = statementCache.get(db);
  if (!dbCache) {
    dbCache = new Map();
    statementCache.set(db, dbCache);
  }

  let result = dbCache.get(query);
  if (!result) {
    result = db.prepare(query);
    dbCache.set(query, result);
  }

  return result;
}

function objectToJSON(data: any) {
  return JSON.stringify(data);
}
function jsonToObject(json: string): any {
  return JSON.parse(json);
}
function rowToConversation(row: ConversationRow): ConversationType {
  const parsedJson = JSON.parse(row.json);

  let profileLastFetchedAt: undefined | number;
  if (isNormalNumber(row.profileLastFetchedAt)) {
    profileLastFetchedAt = row.profileLastFetchedAt;
  } else {
    assert(
      isNil(row.profileLastFetchedAt),
      'profileLastFetchedAt contained invalid data; defaulting to undefined'
    );
    profileLastFetchedAt = undefined;
  }

  return {
    ...parsedJson,
    profileLastFetchedAt,
  };
}

function isRenderer() {
  if (typeof process === 'undefined' || !process) {
    return true;
  }

  return process.type === 'renderer';
}

function getSQLiteVersion(db: Database): string {
  const { sqlite_version } = db
    .prepare<EmptyQuery>('select sqlite_version() AS sqlite_version')
    .get();

  return sqlite_version;
}

function getSchemaVersion(db: Database): number {
  return db.pragma('schema_version', { simple: true });
}

function setUserVersion(db: Database, version: number): void {
  if (!isNumber(version)) {
    throw new Error(`setUserVersion: version ${version} is not a number`);
  }
  db.pragma(`user_version = ${version}`);
}
function keyDatabase(db: Database, key: string): void {
  // https://www.zetetic.net/sqlcipher/sqlcipher-api/#key
  db.pragma(`key = "x'${key}'"`);

  // https://sqlite.org/wal.html
  db.pragma('journal_mode = WAL');
  db.pragma('synchronous = NORMAL');
}
function getUserVersion(db: Database): number {
  return db.pragma('user_version', { simple: true });
}

function getSQLCipherVersion(db: Database): string | undefined {
  return db.pragma('cipher_version', { simple: true });
}

function getSQLCipherIntegrityCheck(db: Database): Array<string> | undefined {
  const rows: Array<{ cipher_integrity_check: string }> = db.pragma(
    'cipher_integrity_check'
  );
  if (rows.length === 0) {
    return undefined;
  }
  return rows.map(row => row.cipher_integrity_check);
}

function getSQLIntegrityCheck(db: Database): string | undefined {
  const checkResult = db.pragma('integrity_check', { simple: true });
  if (checkResult !== 'ok') {
    return checkResult;
  }

  return undefined;
}

function migrateSchemaVersion(db: Database): void {
  const userVersion = getUserVersion(db);
  if (userVersion > 0) {
    return;
  }

  const schemaVersion = getSchemaVersion(db);
  const newUserVersion = schemaVersion > 18 ? 16 : schemaVersion;
  console.log(
    'migrateSchemaVersion: Migrating from schema_version ' +
      `${schemaVersion} to user_version ${newUserVersion}`
  );

  setUserVersion(db, newUserVersion);
}

function openAndMigrateDatabase(filePath: string, key: string) {
  let db: Database | undefined;

  // First, we try to open the database without any cipher changes
  try {
    db = new SQL(filePath);
    keyDatabase(db, key);
    migrateSchemaVersion(db);

    return db;
  } catch (error) {
    if (db) {
      db.close();
    }
    console.log('migrateDatabase: Migration without cipher change failed');
  }

  // If that fails, we try to open the database with 3.x compatibility to extract the
  //   user_version (previously stored in schema_version, blown away by cipher_migrate).
  db = new SQL(filePath);
  keyDatabase(db, key);

  // https://www.zetetic.net/blog/2018/11/30/sqlcipher-400-release/#compatability-sqlcipher-4-0-0
  db.pragma('cipher_compatibility = 3');
  migrateSchemaVersion(db);
  db.close();

  // After migrating user_version -> schema_version, we reopen database, because we can't
  //   migrate to the latest ciphers after we've modified the defaults.
  db = new SQL(filePath);
  keyDatabase(db, key);

  db.pragma('cipher_migrate');

  return db;
}

const INVALID_KEY = /[^0-9A-Fa-f]/;
function openAndSetUpSQLCipher(filePath: string, { key }: { key: string }) {
  const match = INVALID_KEY.exec(key);
  if (match) {
    throw new Error(`setupSQLCipher: key '${key}' is not valid`);
  }

  const db = openAndMigrateDatabase(filePath, key);

  // Because foreign key support is not enabled by default!
  db.pragma('foreign_keys = ON');

  return db;
}

function updateToSchemaVersion1(currentVersion: number, db: Database): void {
  if (currentVersion >= 1) {
    return;
  }

  console.log('updateToSchemaVersion1: starting...');

  db.transaction(() => {
    db.exec(`
      CREATE TABLE messages(
        id STRING PRIMARY KEY ASC,
        json TEXT,

        unread INTEGER,
        expires_at INTEGER,
        sent_at INTEGER,
        schemaVersion INTEGER,
        conversationId STRING,
        received_at INTEGER,
        source STRING,
        sourceDevice STRING,
        hasAttachments INTEGER,
        hasFileAttachments INTEGER,
        hasVisualMediaAttachments INTEGER
      );
      CREATE INDEX messages_unread ON messages (
        unread
      );
      CREATE INDEX messages_expires_at ON messages (
        expires_at
      );
      CREATE INDEX messages_receipt ON messages (
        sent_at
      );
      CREATE INDEX messages_schemaVersion ON messages (
        schemaVersion
      );
      CREATE INDEX messages_conversation ON messages (
        conversationId,
        received_at
      );
      CREATE INDEX messages_duplicate_check ON messages (
        source,
        sourceDevice,
        sent_at
      );
      CREATE INDEX messages_hasAttachments ON messages (
        conversationId,
        hasAttachments,
        received_at
      );
      CREATE INDEX messages_hasFileAttachments ON messages (
        conversationId,
        hasFileAttachments,
        received_at
      );
      CREATE INDEX messages_hasVisualMediaAttachments ON messages (
        conversationId,
        hasVisualMediaAttachments,
        received_at
      );
      CREATE TABLE unprocessed(
        id STRING,
        timestamp INTEGER,
        json TEXT
      );
      CREATE INDEX unprocessed_id ON unprocessed (
        id
      );
      CREATE INDEX unprocessed_timestamp ON unprocessed (
        timestamp
      );
    `);

    db.pragma('user_version = 1');
  })();

  console.log('updateToSchemaVersion1: success!');
}

function updateToSchemaVersion2(currentVersion: number, db: Database): void {
  if (currentVersion >= 2) {
    return;
  }

  console.log('updateToSchemaVersion2: starting...');

  db.transaction(() => {
    db.exec(`
      ALTER TABLE messages
        ADD COLUMN expireTimer INTEGER;

      ALTER TABLE messages
        ADD COLUMN expirationStartTimestamp INTEGER;

      ALTER TABLE messages
        ADD COLUMN type STRING;

      CREATE INDEX messages_expiring ON messages (
        expireTimer,
        expirationStartTimestamp,
        expires_at
      );

      UPDATE messages SET
        expirationStartTimestamp = json_extract(json, '$.expirationStartTimestamp'),
        expireTimer = json_extract(json, '$.expireTimer'),
        type = json_extract(json, '$.type');
    `);
    db.pragma('user_version = 2');
  })();
  console.log('updateToSchemaVersion2: success!');
}

function updateToSchemaVersion3(currentVersion: number, db: Database): void {
  if (currentVersion >= 3) {
    return;
  }

  console.log('updateToSchemaVersion3: starting...');

  db.transaction(() => {
    db.exec(`
      DROP INDEX messages_expiring;
      DROP INDEX messages_unread;

      CREATE INDEX messages_without_timer ON messages (
        expireTimer,
        expires_at,
        type
      ) WHERE expires_at IS NULL AND expireTimer IS NOT NULL;

      CREATE INDEX messages_unread ON messages (
        conversationId,
        unread
      ) WHERE unread IS NOT NULL;

      ANALYZE;
    `);

    db.pragma('user_version = 3');
  })();

  console.log('updateToSchemaVersion3: success!');
}

function updateToSchemaVersion4(currentVersion: number, db: Database): void {
  if (currentVersion >= 4) {
    return;
  }

  console.log('updateToSchemaVersion4: starting...');

  db.transaction(() => {
    db.exec(`
      CREATE TABLE conversations(
        id STRING PRIMARY KEY ASC,
        json TEXT,

        active_at INTEGER,
        type STRING,
        members TEXT,
        name TEXT,
        profileName TEXT
      );
      CREATE INDEX conversations_active ON conversations (
        active_at
      ) WHERE active_at IS NOT NULL;

      CREATE INDEX conversations_type ON conversations (
        type
      ) WHERE type IS NOT NULL;
    `);

    db.pragma('user_version = 4');
  })();

  console.log('updateToSchemaVersion4: success!');
}

function updateToSchemaVersion6(currentVersion: number, db: Database): void {
  if (currentVersion >= 6) {
    return;
  }
  console.log('updateToSchemaVersion6: starting...');

  db.transaction(() => {
    db.exec(`
      -- key-value, ids are strings, one extra column
      CREATE TABLE sessions(
        id STRING PRIMARY KEY ASC,
        number STRING,
        json TEXT
      );
      CREATE INDEX sessions_number ON sessions (
        number
      ) WHERE number IS NOT NULL;
      -- key-value, ids are strings
      CREATE TABLE groups(
        id STRING PRIMARY KEY ASC,
        json TEXT
      );
      CREATE TABLE identityKeys(
        id STRING PRIMARY KEY ASC,
        json TEXT
      );
      CREATE TABLE items(
        id STRING PRIMARY KEY ASC,
        json TEXT
      );
      -- key-value, ids are integers
      CREATE TABLE preKeys(
        id INTEGER PRIMARY KEY ASC,
        json TEXT
      );
      CREATE TABLE signedPreKeys(
        id INTEGER PRIMARY KEY ASC,
        json TEXT
      );
    `);

    db.pragma('user_version = 6');
  })();

  console.log('updateToSchemaVersion6: success!');
}

function updateToSchemaVersion7(currentVersion: number, db: Database): void {
  if (currentVersion >= 7) {
    return;
  }
  console.log('updateToSchemaVersion7: starting...');

  db.transaction(() => {
    db.exec(`
      -- SQLite has been coercing our STRINGs into numbers, so we force it with TEXT
      -- We create a new table then copy the data into it, since we can't modify columns
      DROP INDEX sessions_number;
      ALTER TABLE sessions RENAME TO sessions_old;

      CREATE TABLE sessions(
        id TEXT PRIMARY KEY,
        number TEXT,
        json TEXT
      );
      CREATE INDEX sessions_number ON sessions (
        number
      ) WHERE number IS NOT NULL;
      INSERT INTO sessions(id, number, json)
        SELECT "+" || id, number, json FROM sessions_old;
      DROP TABLE sessions_old;
    `);

    db.pragma('user_version = 7');
  })();
  console.log('updateToSchemaVersion7: success!');
}

function updateToSchemaVersion8(currentVersion: number, db: Database): void {
  if (currentVersion >= 8) {
    return;
  }
  console.log('updateToSchemaVersion8: starting...');
  db.transaction(() => {
    db.exec(`
      -- First, we pull a new body field out of the message table's json blob
      ALTER TABLE messages
        ADD COLUMN body TEXT;
      UPDATE messages SET body = json_extract(json, '$.body');

      -- Then we create our full-text search table and populate it
      CREATE VIRTUAL TABLE messages_fts
        USING fts5(id UNINDEXED, body);

      INSERT INTO messages_fts(id, body)
        SELECT id, body FROM messages;

      -- Then we set up triggers to keep the full-text search table up to date
      CREATE TRIGGER messages_on_insert AFTER INSERT ON messages BEGIN
        INSERT INTO messages_fts (
          id,
          body
        ) VALUES (
          new.id,
          new.body
        );
      END;
      CREATE TRIGGER messages_on_delete AFTER DELETE ON messages BEGIN
        DELETE FROM messages_fts WHERE id = old.id;
      END;
      CREATE TRIGGER messages_on_update AFTER UPDATE ON messages BEGIN
        DELETE FROM messages_fts WHERE id = old.id;
        INSERT INTO messages_fts(
          id,
          body
        ) VALUES (
          new.id,
          new.body
        );
      END;
    `);

    // For formatting search results:
    //   https://sqlite.org/fts5.html#the_highlight_function
    //   https://sqlite.org/fts5.html#the_snippet_function

    db.pragma('user_version = 8');
  })();
  console.log('updateToSchemaVersion8: success!');
}

function updateToSchemaVersion9(currentVersion: number, db: Database): void {
  if (currentVersion >= 9) {
    return;
  }
  console.log('updateToSchemaVersion9: starting...');

  db.transaction(() => {
    db.exec(`
      CREATE TABLE attachment_downloads(
        id STRING primary key,
        timestamp INTEGER,
        pending INTEGER,
        json TEXT
      );

      CREATE INDEX attachment_downloads_timestamp
        ON attachment_downloads (
          timestamp
      ) WHERE pending = 0;
      CREATE INDEX attachment_downloads_pending
        ON attachment_downloads (
          pending
      ) WHERE pending != 0;
    `);

    db.pragma('user_version = 9');
  })();

  console.log('updateToSchemaVersion9: success!');
}

function updateToSchemaVersion10(currentVersion: number, db: Database): void {
  if (currentVersion >= 10) {
    return;
  }
  console.log('updateToSchemaVersion10: starting...');
  db.transaction(() => {
    db.exec(`
      DROP INDEX unprocessed_id;
      DROP INDEX unprocessed_timestamp;
      ALTER TABLE unprocessed RENAME TO unprocessed_old;

      CREATE TABLE unprocessed(
        id STRING,
        timestamp INTEGER,
        version INTEGER,
        attempts INTEGER,
        envelope TEXT,
        decrypted TEXT,
        source TEXT,
        sourceDevice TEXT,
        serverTimestamp INTEGER
      );

      CREATE INDEX unprocessed_id ON unprocessed (
        id
      );
      CREATE INDEX unprocessed_timestamp ON unprocessed (
        timestamp
      );

      INSERT INTO unprocessed (
        id,
        timestamp,
        version,
        attempts,
        envelope,
        decrypted,
        source,
        sourceDevice,
        serverTimestamp
      ) SELECT
        id,
        timestamp,
        json_extract(json, '$.version'),
        json_extract(json, '$.attempts'),
        json_extract(json, '$.envelope'),
        json_extract(json, '$.decrypted'),
        json_extract(json, '$.source'),
        json_extract(json, '$.sourceDevice'),
        json_extract(json, '$.serverTimestamp')
      FROM unprocessed_old;

      DROP TABLE unprocessed_old;
    `);

    db.pragma('user_version = 10');
  })();
  console.log('updateToSchemaVersion10: success!');
}

function updateToSchemaVersion11(currentVersion: number, db: Database): void {
  if (currentVersion >= 11) {
    return;
  }
  console.log('updateToSchemaVersion11: starting...');

  db.transaction(() => {
    db.exec(`
      DROP TABLE groups;
    `);

    db.pragma('user_version = 11');
  })();
  console.log('updateToSchemaVersion11: success!');
}

function updateToSchemaVersion12(currentVersion: number, db: Database): void {
  if (currentVersion >= 12) {
    return;
  }

  console.log('updateToSchemaVersion12: starting...');
  db.transaction(() => {
    db.exec(`
      CREATE TABLE sticker_packs(
        id TEXT PRIMARY KEY,
        key TEXT NOT NULL,

        author STRING,
        coverStickerId INTEGER,
        createdAt INTEGER,
        downloadAttempts INTEGER,
        installedAt INTEGER,
        lastUsed INTEGER,
        status STRING,
        stickerCount INTEGER,
        title STRING
      );

      CREATE TABLE stickers(
        id INTEGER NOT NULL,
        packId TEXT NOT NULL,

        emoji STRING,
        height INTEGER,
        isCoverOnly INTEGER,
        lastUsed INTEGER,
        path STRING,
        width INTEGER,

        PRIMARY KEY (id, packId),
        CONSTRAINT stickers_fk
          FOREIGN KEY (packId)
          REFERENCES sticker_packs(id)
          ON DELETE CASCADE
      );

      CREATE INDEX stickers_recents
        ON stickers (
          lastUsed
      ) WHERE lastUsed IS NOT NULL;

      CREATE TABLE sticker_references(
        messageId STRING,
        packId TEXT,
        CONSTRAINT sticker_references_fk
          FOREIGN KEY(packId)
          REFERENCES sticker_packs(id)
          ON DELETE CASCADE
      );
    `);

    db.pragma('user_version = 12');
  })();
  console.log('updateToSchemaVersion12: success!');
}

function updateToSchemaVersion13(currentVersion: number, db: Database): void {
  if (currentVersion >= 13) {
    return;
  }

  console.log('updateToSchemaVersion13: starting...');
  db.transaction(() => {
    db.exec(`
      ALTER TABLE sticker_packs ADD COLUMN attemptedStatus STRING;
    `);

    db.pragma('user_version = 13');
  })();
  console.log('updateToSchemaVersion13: success!');
}

function updateToSchemaVersion14(currentVersion: number, db: Database): void {
  if (currentVersion >= 14) {
    return;
  }

  console.log('updateToSchemaVersion14: starting...');
  db.transaction(() => {
    db.exec(`
      CREATE TABLE emojis(
        shortName STRING PRIMARY KEY,
        lastUsage INTEGER
      );

      CREATE INDEX emojis_lastUsage
        ON emojis (
          lastUsage
      );
    `);

    db.pragma('user_version = 14');
  })();

  console.log('updateToSchemaVersion14: success!');
}

function updateToSchemaVersion15(currentVersion: number, db: Database): void {
  if (currentVersion >= 15) {
    return;
  }

  console.log('updateToSchemaVersion15: starting...');
  db.transaction(() => {
    db.exec(`
      -- SQLite has again coerced our STRINGs into numbers, so we force it with TEXT
      -- We create a new table then copy the data into it, since we can't modify columns

      DROP INDEX emojis_lastUsage;
      ALTER TABLE emojis RENAME TO emojis_old;

      CREATE TABLE emojis(
        shortName TEXT PRIMARY KEY,
        lastUsage INTEGER
      );
      CREATE INDEX emojis_lastUsage
        ON emojis (
          lastUsage
      );

      DELETE FROM emojis WHERE shortName = 1;
      INSERT INTO emojis(shortName, lastUsage)
        SELECT shortName, lastUsage FROM emojis_old;

      DROP TABLE emojis_old;
    `);

    db.pragma('user_version = 15');
  })();
  console.log('updateToSchemaVersion15: success!');
}

function updateToSchemaVersion16(currentVersion: number, db: Database): void {
  if (currentVersion >= 16) {
    return;
  }

  console.log('updateToSchemaVersion16: starting...');
  db.transaction(() => {
    db.exec(`
      ALTER TABLE messages
      ADD COLUMN messageTimer INTEGER;
      ALTER TABLE messages
      ADD COLUMN messageTimerStart INTEGER;
      ALTER TABLE messages
      ADD COLUMN messageTimerExpiresAt INTEGER;
      ALTER TABLE messages
      ADD COLUMN isErased INTEGER;

      CREATE INDEX messages_message_timer ON messages (
        messageTimer,
        messageTimerStart,
        messageTimerExpiresAt,
        isErased
      ) WHERE messageTimer IS NOT NULL;

      -- Updating full-text triggers to avoid anything with a messageTimer set

      DROP TRIGGER messages_on_insert;
      DROP TRIGGER messages_on_delete;
      DROP TRIGGER messages_on_update;

      CREATE TRIGGER messages_on_insert AFTER INSERT ON messages
      WHEN new.messageTimer IS NULL
      BEGIN
        INSERT INTO messages_fts (
          id,
          body
        ) VALUES (
          new.id,
          new.body
        );
      END;
      CREATE TRIGGER messages_on_delete AFTER DELETE ON messages BEGIN
        DELETE FROM messages_fts WHERE id = old.id;
      END;
      CREATE TRIGGER messages_on_update AFTER UPDATE ON messages
      WHEN new.messageTimer IS NULL
      BEGIN
        DELETE FROM messages_fts WHERE id = old.id;
        INSERT INTO messages_fts(
          id,
          body
        ) VALUES (
          new.id,
          new.body
        );
      END;
    `);

    db.pragma('user_version = 16');
  })();
  console.log('updateToSchemaVersion16: success!');
}

function updateToSchemaVersion17(currentVersion: number, db: Database): void {
  if (currentVersion >= 17) {
    return;
  }

  console.log('updateToSchemaVersion17: starting...');
  db.transaction(() => {
    try {
      db.exec(`
        ALTER TABLE messages
        ADD COLUMN isViewOnce INTEGER;

        DROP INDEX messages_message_timer;
      `);
    } catch (error) {
      console.log(
        'updateToSchemaVersion17: Message table already had isViewOnce column'
      );
    }

    try {
      db.exec('DROP INDEX messages_view_once;');
    } catch (error) {
      console.log(
        'updateToSchemaVersion17: Index messages_view_once did not already exist'
      );
    }

    db.exec(`
      CREATE INDEX messages_view_once ON messages (
        isErased
      ) WHERE isViewOnce = 1;

      -- Updating full-text triggers to avoid anything with isViewOnce = 1

      DROP TRIGGER messages_on_insert;
      DROP TRIGGER messages_on_update;

      CREATE TRIGGER messages_on_insert AFTER INSERT ON messages
      WHEN new.isViewOnce != 1
      BEGIN
        INSERT INTO messages_fts (
          id,
          body
        ) VALUES (
          new.id,
          new.body
        );
      END;
      CREATE TRIGGER messages_on_update AFTER UPDATE ON messages
      WHEN new.isViewOnce != 1
      BEGIN
        DELETE FROM messages_fts WHERE id = old.id;
        INSERT INTO messages_fts(
          id,
          body
        ) VALUES (
          new.id,
          new.body
        );
      END;
    `);

    db.pragma('user_version = 17');
  })();
  console.log('updateToSchemaVersion17: success!');
}

function updateToSchemaVersion18(currentVersion: number, db: Database): void {
  if (currentVersion >= 18) {
    return;
  }

  console.log('updateToSchemaVersion18: starting...');
  db.transaction(() => {
    db.exec(`
      -- Delete and rebuild full-text search index to capture everything

      DELETE FROM messages_fts;
      INSERT INTO messages_fts(messages_fts) VALUES('rebuild');

      INSERT INTO messages_fts(id, body)
      SELECT id, body FROM messages WHERE isViewOnce IS NULL OR isViewOnce != 1;

      -- Fixing full-text triggers

      DROP TRIGGER messages_on_insert;
      DROP TRIGGER messages_on_update;

      CREATE TRIGGER messages_on_insert AFTER INSERT ON messages
      WHEN new.isViewOnce IS NULL OR new.isViewOnce != 1
      BEGIN
        INSERT INTO messages_fts (
          id,
          body
        ) VALUES (
          new.id,
          new.body
        );
      END;
      CREATE TRIGGER messages_on_update AFTER UPDATE ON messages
      WHEN new.isViewOnce IS NULL OR new.isViewOnce != 1
      BEGIN
        DELETE FROM messages_fts WHERE id = old.id;
        INSERT INTO messages_fts(
          id,
          body
        ) VALUES (
          new.id,
          new.body
        );
      END;
    `);

    db.pragma('user_version = 18');
  })();
  console.log('updateToSchemaVersion18: success!');
}

function updateToSchemaVersion19(currentVersion: number, db: Database): void {
  if (currentVersion >= 19) {
    return;
  }

  console.log('updateToSchemaVersion19: starting...');
  db.transaction(() => {
    db.exec(`
      ALTER TABLE conversations
      ADD COLUMN profileFamilyName TEXT;
      ALTER TABLE conversations
      ADD COLUMN profileFullName TEXT;

      -- Preload new field with the profileName we already have
      UPDATE conversations SET profileFullName = profileName;
    `);

    db.pragma('user_version = 19');
  })();

  console.log('updateToSchemaVersion19: success!');
}

function updateToSchemaVersion20(currentVersion: number, db: Database): void {
  if (currentVersion >= 20) {
    return;
  }

  console.log('updateToSchemaVersion20: starting...');
  db.transaction(() => {
    // The triggers on the messages table slow down this migration
    // significantly, so we drop them and recreate them later.
    // Drop triggers
    const triggers = db
      .prepare<EmptyQuery>(
        'SELECT * FROM sqlite_master WHERE type = "trigger" AND tbl_name = "messages"'
      )
      .all();

    for (const trigger of triggers) {
      db.exec(`DROP TRIGGER ${trigger.name}`);
    }

    // Create new columns and indices
    db.exec(`
      ALTER TABLE conversations ADD COLUMN e164 TEXT;
      ALTER TABLE conversations ADD COLUMN uuid TEXT;
      ALTER TABLE conversations ADD COLUMN groupId TEXT;
      ALTER TABLE messages ADD COLUMN sourceUuid TEXT;
      ALTER TABLE sessions RENAME COLUMN number TO conversationId;
      CREATE INDEX conversations_e164 ON conversations(e164);
      CREATE INDEX conversations_uuid ON conversations(uuid);
      CREATE INDEX conversations_groupId ON conversations(groupId);
      CREATE INDEX messages_sourceUuid on messages(sourceUuid);

      -- Migrate existing IDs
      UPDATE conversations SET e164 = '+' || id WHERE type = 'private';
      UPDATE conversations SET groupId = id WHERE type = 'group';
    `);

    // Drop invalid groups and any associated messages
    const maybeInvalidGroups = db
      .prepare<EmptyQuery>(
        "SELECT * FROM conversations WHERE type = 'group' AND members IS NULL;"
      )
      .all();
    for (const group of maybeInvalidGroups) {
      const json: { id: string; members: Array<any> } = JSON.parse(group.json);
      if (!json.members || !json.members.length) {
        db.prepare<Query>('DELETE FROM conversations WHERE id = $id;').run({
          id: json.id,
        });
        db.prepare<Query>(
          'DELETE FROM messages WHERE conversationId = $id;'
        ).run({ id: json.id });
      }
    }

    // Generate new IDs and alter data
    const allConversations = db
      .prepare<EmptyQuery>('SELECT * FROM conversations;')
      .all();
    const allConversationsByOldId = keyBy(allConversations, 'id');

    for (const row of allConversations) {
      const oldId = row.id;
      const newId = generateUUID();
      allConversationsByOldId[oldId].id = newId;
      const patchObj: any = { id: newId };
      if (row.type === 'private') {
        patchObj.e164 = `+${oldId}`;
      } else if (row.type === 'group') {
        patchObj.groupId = oldId;
      }
      const patch = JSON.stringify(patchObj);

      db.prepare<Query>(
        `
        UPDATE conversations
        SET id = $newId, json = JSON_PATCH(json, $patch)
        WHERE id = $oldId
        `
      ).run({
        newId,
        oldId,
        patch,
      });
      const messagePatch = JSON.stringify({ conversationId: newId });
      db.prepare<Query>(
        `
        UPDATE messages
        SET conversationId = $newId, json = JSON_PATCH(json, $patch)
        WHERE conversationId = $oldId
        `
      ).run({ newId, oldId, patch: messagePatch });
    }

    const groupConversations: Array<{
      id: string;
      members: string;
      json: string;
    }> = db
      .prepare<EmptyQuery>(
        `
        SELECT id, members, json FROM conversations WHERE type = 'group';
        `
      )
      .all();

    // Update group conversations, point members at new conversation ids
    groupConversations.forEach(groupRow => {
      const members = groupRow.members.split(/\s?\+/).filter(Boolean);
      const newMembers = [];
      for (const m of members) {
        const memberRow = allConversationsByOldId[m];

        if (memberRow) {
          newMembers.push(memberRow.id);
        } else {
          // We didn't previously have a private conversation for this member,
          // we need to create one
          const id = generateUUID();
          saveConversation({
            id,
            e164: m,
            type: 'private',
            version: 2,
            unreadCount: 0,
            verified: 0,

            // Not directly used by saveConversation, but are necessary
            // for conversation model
            inbox_position: 0,
            isPinned: false,
            lastMessageDeletedForEveryone: false,
            markedUnread: false,
            messageCount: 0,
            sentMessageCount: 0,
            profileSharing: false,
          });

          newMembers.push(id);
        }
      }
      const json = { ...jsonToObject(groupRow.json), members: newMembers };
      const newMembersValue = newMembers.join(' ');
      db.prepare<Query>(
        `
        UPDATE conversations
        SET members = $newMembersValue, json = $newJsonValue
        WHERE id = $id
        `
      ).run({
        id: groupRow.id,
        newMembersValue,
        newJsonValue: objectToJSON(json),
      });
    });

    // Update sessions to stable IDs
    const allSessions = db.prepare<EmptyQuery>('SELECT * FROM sessions;').all();
    for (const session of allSessions) {
      // Not using patch here so we can explicitly delete a property rather than
      // implicitly delete via null
      const newJson = JSON.parse(session.json);
      const conversation = allConversationsByOldId[newJson.number.substr(1)];
      if (conversation) {
        newJson.conversationId = conversation.id;
        newJson.id = `${newJson.conversationId}.${newJson.deviceId}`;
      }
      delete newJson.number;
      db.prepare<Query>(
        `
        UPDATE sessions
        SET id = $newId, json = $newJson, conversationId = $newConversationId
        WHERE id = $oldId
        `
      ).run({
        newId: newJson.id,
        newJson: objectToJSON(newJson),
        oldId: session.id,
        newConversationId: newJson.conversationId,
      });
    }

    // Update identity keys to stable IDs
    const allIdentityKeys = db
      .prepare<EmptyQuery>('SELECT * FROM identityKeys;')
      .all();
    for (const identityKey of allIdentityKeys) {
      const newJson = JSON.parse(identityKey.json);
      newJson.id = allConversationsByOldId[newJson.id];
      db.prepare<Query>(
        `
        UPDATE identityKeys
        SET id = $newId, json = $newJson
        WHERE id = $oldId
        `
      ).run({
        newId: newJson.id,
        newJson: objectToJSON(newJson),
        oldId: identityKey.id,
      });
    }

    // Recreate triggers
    for (const trigger of triggers) {
      db.exec(trigger.sql);
    }

    db.pragma('user_version = 20');
  })();
  console.log('updateToSchemaVersion20: success!');
}

function updateToSchemaVersion21(currentVersion: number, db: Database): void {
  if (currentVersion >= 21) {
    return;
  }

  db.transaction(() => {
    db.exec(`
      UPDATE conversations
      SET json = json_set(
        json,
        '$.messageCount',
        (SELECT count(*) FROM messages WHERE messages.conversationId = conversations.id)
      );
      UPDATE conversations
      SET json = json_set(
        json,
        '$.sentMessageCount',
        (SELECT count(*) FROM messages WHERE messages.conversationId = conversations.id AND messages.type = 'outgoing')
      );
    `);
    db.pragma('user_version = 21');
  })();
  console.log('updateToSchemaVersion21: success!');
}

function updateToSchemaVersion22(currentVersion: number, db: Database): void {
  if (currentVersion >= 22) {
    return;
  }

  db.transaction(() => {
    db.exec(`
      ALTER TABLE unprocessed
        ADD COLUMN sourceUuid STRING;
    `);

    db.pragma('user_version = 22');
  })();
  console.log('updateToSchemaVersion22: success!');
}

function updateToSchemaVersion23(currentVersion: number, db: Database): void {
  if (currentVersion >= 23) {
    return;
  }

  db.transaction(() => {
    db.exec(`
      -- Remove triggers which keep full-text search up to date
      DROP TRIGGER messages_on_insert;
      DROP TRIGGER messages_on_update;
      DROP TRIGGER messages_on_delete;
    `);

    db.pragma('user_version = 23');
  })();
  console.log('updateToSchemaVersion23: success!');
}

function updateToSchemaVersion24(currentVersion: number, db: Database): void {
  if (currentVersion >= 24) {
    return;
  }

  db.transaction(() => {
    db.exec(`
      ALTER TABLE conversations
      ADD COLUMN profileLastFetchedAt INTEGER;
    `);

    db.pragma('user_version = 24');
  })();
  console.log('updateToSchemaVersion24: success!');
}

const SCHEMA_VERSIONS = [
  updateToSchemaVersion1,
  updateToSchemaVersion2,
  updateToSchemaVersion3,
  updateToSchemaVersion4,
  (_v: number, _i: Database) => null, // version 5 was dropped
  updateToSchemaVersion6,
  updateToSchemaVersion7,
  updateToSchemaVersion8,
  updateToSchemaVersion9,
  updateToSchemaVersion10,
  updateToSchemaVersion11,
  updateToSchemaVersion12,
  updateToSchemaVersion13,
  updateToSchemaVersion14,
  updateToSchemaVersion15,
  updateToSchemaVersion16,
  updateToSchemaVersion17,
  updateToSchemaVersion18,
  updateToSchemaVersion19,
  updateToSchemaVersion20,
  updateToSchemaVersion21,
  updateToSchemaVersion22,
  updateToSchemaVersion23,
  updateToSchemaVersion24,
];

function updateSchema(db: Database): void {
  const sqliteVersion = getSQLiteVersion(db);
  const sqlcipherVersion = getSQLCipherVersion(db);
  const userVersion = getUserVersion(db);
  const maxUserVersion = SCHEMA_VERSIONS.length;
  const schemaVersion = getSchemaVersion(db);

  console.log(
    'updateSchema:\n',
    ` Current user_version: ${userVersion};\n`,
    ` Most recent db schema: ${maxUserVersion};\n`,
    ` SQLite version: ${sqliteVersion};\n`,
    ` SQLCipher version: ${sqlcipherVersion};\n`,
    ` (deprecated) schema_version: ${schemaVersion};\n`
  );

  if (userVersion > maxUserVersion) {
    throw new Error(
      `SQL: User version is ${userVersion} but the expected maximum version is ${maxUserVersion}. Did you try to start an old version of Signal?`
    );
  }

  for (let index = 0; index < maxUserVersion; index += 1) {
    const runSchemaUpdate = SCHEMA_VERSIONS[index];

    // Yes, we really want to do this asynchronously, in order
    runSchemaUpdate(userVersion, db);
  }
}

let globalInstance: Database | undefined;
let globalInstanceRenderer: Database | undefined;
let databaseFilePath: string | undefined;
let indexedDBPath: string | undefined;

async function initialize({
  configDir,
  key,
}: {
  configDir: string;
  key: string;
}) {
  if (globalInstance) {
    throw new Error('Cannot initialize more than once!');
  }

  if (!isString(configDir)) {
    throw new Error('initialize: configDir is required!');
  }
  if (!isString(key)) {
    throw new Error('initialize: key is required!');
  }

  indexedDBPath = join(configDir, 'IndexedDB');

  const dbDir = join(configDir, 'sql');
  mkdirp.sync(dbDir);

  databaseFilePath = join(dbDir, 'db.sqlite');

  let db: Database | undefined;

  try {
    db = openAndSetUpSQLCipher(databaseFilePath, { key });

    // For profiling use:
    // db.pragma('cipher_profile=\'sqlcipher.log\'');

    updateSchema(db);

    // test database

    const cipherIntegrityResult = getSQLCipherIntegrityCheck(db);
    if (cipherIntegrityResult) {
      console.log(
        'Database cipher integrity check failed:',
        cipherIntegrityResult
      );
      throw new Error(
        `Cipher integrity check failed: ${cipherIntegrityResult}`
      );
    }
    const integrityResult = getSQLIntegrityCheck(db);
    if (integrityResult) {
      console.log('Database integrity check failed:', integrityResult);
      throw new Error(`Integrity check failed: ${integrityResult}`);
    }

    // At this point we can allow general access to the database
    globalInstance = db;

    // test database
    getMessageCount();
  } catch (error) {
    console.log('Database startup error:', error.stack);
    if (db) {
      db.close();
    }
    throw error;
  }
}

async function initializeRenderer({
  configDir,
  key,
}: {
  configDir: string;
  key: string;
}) {
  if (!isRenderer()) {
    throw new Error('Cannot call from main process.');
  }
  if (globalInstanceRenderer) {
    throw new Error('Cannot initialize more than once!');
  }
  if (!isString(configDir)) {
    throw new Error('initialize: configDir is required!');
  }
  if (!isString(key)) {
    throw new Error('initialize: key is required!');
  }

  if (!indexedDBPath) {
    indexedDBPath = join(configDir, 'IndexedDB');
  }

  const dbDir = join(configDir, 'sql');

  if (!databaseFilePath) {
    databaseFilePath = join(dbDir, 'db.sqlite');
  }

  let promisified: Database | undefined;

  try {
    promisified = openAndSetUpSQLCipher(databaseFilePath, { key });

    // At this point we can allow general access to the database
    globalInstanceRenderer = promisified;

    // test database
    getMessageCount();
  } catch (error) {
    window.log.error('Database startup error:', error.stack);
    throw error;
  }
}

async function close(): Promise<void> {
  if (!globalInstance) {
    return;
  }

  const dbRef = globalInstance;
  globalInstance = undefined;
  dbRef.close();
}

async function removeDB(): Promise<void> {
  if (globalInstance) {
    throw new Error('removeDB: Cannot erase database when it is open!');
  }
  if (!databaseFilePath) {
    throw new Error(
      'removeDB: Cannot erase database without a databaseFilePath!'
    );
  }

  rimraf.sync(databaseFilePath);
  rimraf.sync(`${databaseFilePath}-shm`);
  rimraf.sync(`${databaseFilePath}-wal`);
}

async function removeIndexedDBFiles(): Promise<void> {
  if (!indexedDBPath) {
    throw new Error(
      'removeIndexedDBFiles: Need to initialize and set indexedDBPath first!'
    );
  }

  const pattern = join(indexedDBPath, '*.leveldb');
  rimraf.sync(pattern);
  indexedDBPath = undefined;
}

function getInstance(): Database {
  if (isRenderer()) {
    if (!globalInstanceRenderer) {
      throw new Error('getInstance: globalInstanceRenderer not set!');
    }
    return globalInstanceRenderer;
  }

  if (!globalInstance) {
    throw new Error('getInstance: globalInstance not set!');
  }

  return globalInstance;
}

const IDENTITY_KEYS_TABLE = 'identityKeys';
function createOrUpdateIdentityKey(data: IdentityKeyType): Promise<void> {
  return createOrUpdate(IDENTITY_KEYS_TABLE, data);
}
function getIdentityKeyById(id: string): Promise<IdentityKeyType | undefined> {
  return getById(IDENTITY_KEYS_TABLE, id);
}
function bulkAddIdentityKeys(array: Array<IdentityKeyType>): Promise<void> {
  return bulkAdd(IDENTITY_KEYS_TABLE, array);
}
function removeIdentityKeyById(id: string): Promise<void> {
  return removeById(IDENTITY_KEYS_TABLE, id);
}
function removeAllIdentityKeys(): Promise<void> {
  return removeAllFromTable(IDENTITY_KEYS_TABLE);
}
function getAllIdentityKeys(): Promise<Array<IdentityKeyType>> {
  return getAllFromTable(IDENTITY_KEYS_TABLE);
}

const PRE_KEYS_TABLE = 'preKeys';
function createOrUpdatePreKey(data: PreKeyType): Promise<void> {
  return createOrUpdate(PRE_KEYS_TABLE, data);
}
function getPreKeyById(id: number): Promise<PreKeyType | undefined> {
  return getById(PRE_KEYS_TABLE, id);
}
function bulkAddPreKeys(array: Array<PreKeyType>): Promise<void> {
  return bulkAdd(PRE_KEYS_TABLE, array);
}
function removePreKeyById(id: number): Promise<void> {
  return removeById(PRE_KEYS_TABLE, id);
}
function removeAllPreKeys(): Promise<void> {
  return removeAllFromTable(PRE_KEYS_TABLE);
}
function getAllPreKeys(): Promise<Array<PreKeyType>> {
  return getAllFromTable(PRE_KEYS_TABLE);
}

const SIGNED_PRE_KEYS_TABLE = 'signedPreKeys';
function createOrUpdateSignedPreKey(data: SignedPreKeyType): Promise<void> {
  return createOrUpdate(SIGNED_PRE_KEYS_TABLE, data);
}
function getSignedPreKeyById(
  id: number
): Promise<SignedPreKeyType | undefined> {
  return getById(SIGNED_PRE_KEYS_TABLE, id);
}
function bulkAddSignedPreKeys(array: Array<SignedPreKeyType>): Promise<void> {
  return bulkAdd(SIGNED_PRE_KEYS_TABLE, array);
}
function removeSignedPreKeyById(id: number): Promise<void> {
  return removeById(SIGNED_PRE_KEYS_TABLE, id);
}
function removeAllSignedPreKeys(): Promise<void> {
  return removeAllFromTable(SIGNED_PRE_KEYS_TABLE);
}
async function getAllSignedPreKeys(): Promise<Array<SignedPreKeyType>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<EmptyQuery>(
      `
      SELECT json
      FROM signedPreKeys
      ORDER BY id ASC;
      `
    )
    .all();

  return rows.map(row => jsonToObject(row.json));
}

const ITEMS_TABLE = 'items';
function createOrUpdateItem(data: ItemType): Promise<void> {
  return createOrUpdate(ITEMS_TABLE, data);
}
function getItemById(id: string): Promise<ItemType> {
  return getById(ITEMS_TABLE, id);
}
async function getAllItems(): Promise<Array<ItemType>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<EmptyQuery>('SELECT json FROM items ORDER BY id ASC;')
    .all();

  return rows.map(row => jsonToObject(row.json));
}
function bulkAddItems(array: Array<ItemType>): Promise<void> {
  return bulkAdd(ITEMS_TABLE, array);
}
function removeItemById(id: string): Promise<void> {
  return removeById(ITEMS_TABLE, id);
}
function removeAllItems(): Promise<void> {
  return removeAllFromTable(ITEMS_TABLE);
}

const SESSIONS_TABLE = 'sessions';
async function createOrUpdateSession(data: SessionType): Promise<void> {
  const db = getInstance();
  const { id, conversationId } = data;
  if (!id) {
    throw new Error(
      'createOrUpdateSession: Provided data did not have a truthy id'
    );
  }
  if (!conversationId) {
    throw new Error(
      'createOrUpdateSession: Provided data did not have a truthy conversationId'
    );
  }

  prepare(
    db,
    `
    INSERT OR REPLACE INTO sessions (
      id,
      conversationId,
      json
    ) values (
      $id,
      $conversationId,
      $json
    )
    `
  ).run({
    id,
    conversationId,
    json: objectToJSON(data),
  });
}
async function createOrUpdateSessions(
  array: Array<SessionType>
): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    for (const item of array) {
      createOrUpdateSession(item);
    }
  })();
}

async function getSessionById(id: string): Promise<SessionType | undefined> {
  return getById(SESSIONS_TABLE, id);
}
async function getSessionsById(
  conversationId: string
): Promise<Array<SessionType>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<Query>(
      `
      SELECT json
      FROM sessions
      WHERE conversationId = $conversationId;
      `
    )
    .all({
      conversationId,
    });

  return rows.map(row => jsonToObject(row.json));
}
function bulkAddSessions(array: Array<SessionType>): Promise<void> {
  return bulkAdd(SESSIONS_TABLE, array);
}
function removeSessionById(id: string): Promise<void> {
  return removeById(SESSIONS_TABLE, id);
}
async function removeSessionsByConversation(
  conversationId: string
): Promise<void> {
  const db = getInstance();
  db.prepare<Query>(
    `
    DELETE FROM sessions
    WHERE conversationId = $conversationId;
    `
  ).run({
    conversationId,
  });
}
function removeAllSessions(): Promise<void> {
  return removeAllFromTable(SESSIONS_TABLE);
}
function getAllSessions(): Promise<Array<SessionType>> {
  return getAllFromTable(SESSIONS_TABLE);
}

async function createOrUpdate(
  table: string,
  data: Record<string, unknown> & { id: string | number }
): Promise<void> {
  const db = getInstance();
  const { id } = data;
  if (!id) {
    throw new Error('createOrUpdate: Provided data did not have a truthy id');
  }

  db.prepare<Query>(
    `
    INSERT OR REPLACE INTO ${table} (
      id,
      json
    ) values (
      $id,
      $json
    )
    `
  ).run({
    id,
    json: objectToJSON(data),
  });
}

async function bulkAdd(
  table: string,
  array: Array<Record<string, unknown> & { id: string | number }>
): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    for (const data of array) {
      createOrUpdate(table, data);
    }
  })();
}

async function getById<T>(
  table: string,
  id: string | number
): Promise<T | undefined> {
  const db = getInstance();
  const row = db
    .prepare<Query>(
      `
      SELECT *
      FROM ${table}
      WHERE id = $id;
      `
    )
    .get({
      id,
    });

  if (!row) {
    return undefined;
  }

  return jsonToObject(row.json);
}

async function removeById(
  table: string,
  id: string | number | Array<string | number>
): Promise<void> {
  const db = getInstance();
  if (!Array.isArray(id)) {
    db.prepare<Query>(
      `
      DELETE FROM ${table}
      WHERE id = $id;
      `
    ).run({ id });
    return;
  }

  if (!id.length) {
    throw new Error('removeById: No ids to delete!');
  }

  // Our node interface doesn't seem to allow you to replace one single ? with an array
  db.prepare<ArrayQuery>(
    `
    DELETE FROM ${table}
    WHERE id IN ( ${id.map(() => '?').join(', ')} );
    `
  ).run(id);
}

async function removeAllFromTable(table: string): Promise<void> {
  const db = getInstance();
  db.prepare<EmptyQuery>(`DELETE FROM ${table};`).run();
}

async function getAllFromTable<T>(table: string): Promise<Array<T>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<EmptyQuery>(`SELECT json FROM ${table};`)
    .all();

  return rows.map(row => jsonToObject(row.json));
}

// Conversations

async function getConversationCount(): Promise<number> {
  const db = getInstance();
  const row = db
    .prepare<EmptyQuery>('SELECT count(*) from conversations;')
    .get();

  if (!row) {
    throw new Error(
      'getConversationCount: Unable to get count of conversations'
    );
  }

  return row['count(*)'];
}

async function saveConversation(
  data: ConversationType,
  db = getInstance()
): Promise<void> {
  const {
    active_at,
    e164,
    groupId,
    id,
    members,
    membersV2,
    name,
    profileFamilyName,
    profileName,
    profileLastFetchedAt,
    type,
    uuid,
  } = data;

  // prettier-ignore
  const membersList = membersV2
    ? membersV2.map((item: GroupV2MemberType) => item.conversationId).join(' ')
    : members
      ? members.join(' ')
      : null;

  db.prepare<Query>(
    `
    INSERT INTO conversations (
      id,
      json,

      e164,
      uuid,
      groupId,

      active_at,
      type,
      members,
      name,
      profileName,
      profileFamilyName,
      profileFullName,
      profileLastFetchedAt
    ) values (
      $id,
      $json,

      $e164,
      $uuid,
      $groupId,

      $active_at,
      $type,
      $members,
      $name,
      $profileName,
      $profileFamilyName,
      $profileFullName,
      $profileLastFetchedAt
    );
    `
  ).run({
    id,
    json: objectToJSON(omit(data, ['profileLastFetchedAt'])),

    e164: e164 || null,
    uuid: uuid || null,
    groupId: groupId || null,

    active_at: active_at || null,
    type,
    members: membersList,
    name: name || null,
    profileName: profileName || null,
    profileFamilyName: profileFamilyName || null,
    profileFullName: combineNames(profileName, profileFamilyName) || null,
    profileLastFetchedAt: profileLastFetchedAt || null,
  });
}

async function saveConversations(
  arrayOfConversations: Array<ConversationType>
): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    for (const conversation of arrayOfConversations) {
      saveConversation(conversation);
    }
  })();
}

async function updateConversation(data: ConversationType): Promise<void> {
  const db = getInstance();
  const {
    id,
    active_at,
    type,
    members,
    membersV2,
    name,
    profileName,
    profileFamilyName,
    profileLastFetchedAt,
    e164,
    uuid,
  } = data;

  // prettier-ignore
  const membersList = membersV2
    ? membersV2.map((item: GroupV2MemberType) => item.conversationId).join(' ')
    : members
      ? members.join(' ')
      : null;

  prepare(
    db,
    `
    UPDATE conversations SET
      json = $json,

      e164 = $e164,
      uuid = $uuid,

      active_at = $active_at,
      type = $type,
      members = $members,
      name = $name,
      profileName = $profileName,
      profileFamilyName = $profileFamilyName,
      profileFullName = $profileFullName,
      profileLastFetchedAt = $profileLastFetchedAt
    WHERE id = $id;
    `
  ).run({
    id,
    json: objectToJSON(omit(data, ['profileLastFetchedAt'])),

    e164: e164 || null,
    uuid: uuid || null,

    active_at: active_at || null,
    type,
    members: membersList,
    name: name || null,
    profileName: profileName || null,
    profileFamilyName: profileFamilyName || null,
    profileFullName: combineNames(profileName, profileFamilyName) || null,
    profileLastFetchedAt: profileLastFetchedAt || null,
  });
}

async function updateConversations(
  array: Array<ConversationType>
): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    for (const item of array) {
      updateConversation(item);
    }
  })();
}

async function removeConversation(id: Array<string> | string): Promise<void> {
  const db = getInstance();
  if (!Array.isArray(id)) {
    db.prepare<Query>('DELETE FROM conversations WHERE id = id;').run({
      id,
    });

    return;
  }

  if (!id.length) {
    throw new Error('removeConversation: No ids to delete!');
  }

  // Our node interface doesn't seem to allow you to replace one single ? with an array
  db.prepare<ArrayQuery>(
    `
    DELETE FROM conversations
    WHERE id IN ( ${id.map(() => '?').join(', ')} );
    `
  ).run(id);
}

async function getConversationById(
  id: string
): Promise<ConversationType | undefined> {
  const db = getInstance();
  const row: { json: string } = db
    .prepare<Query>('SELECT json FROM conversations WHERE id = $id;')
    .get({ id });

  if (!row) {
    return undefined;
  }

  return jsonToObject(row.json);
}

async function eraseStorageServiceStateFromConversations(): Promise<void> {
  const db = getInstance();

  db.prepare<EmptyQuery>(
    `
    UPDATE conversations
    SET
      json = json_remove(json, '$.storageID', '$.needsStorageServiceSync', '$.unknownFields', '$.storageProfileKey');
    `
  ).run();
}

async function getAllConversations(): Promise<Array<ConversationType>> {
  const db = getInstance();
  const rows: ConversationRows = db
    .prepare<EmptyQuery>(
      `
      SELECT json, profileLastFetchedAt
      FROM conversations
      ORDER BY id ASC;
      `
    )
    .all();

  return rows.map(row => rowToConversation(row));
}

async function getAllConversationIds(): Promise<Array<string>> {
  const db = getInstance();
  const rows: Array<{ id: string }> = db
    .prepare<EmptyQuery>(
      `
      SELECT id FROM conversations ORDER BY id ASC;
      `
    )
    .all();

  return rows.map(row => row.id);
}

async function getAllPrivateConversations(): Promise<Array<ConversationType>> {
  const db = getInstance();
  const rows: ConversationRows = db
    .prepare<EmptyQuery>(
      `
      SELECT json, profileLastFetchedAt
      FROM conversations
      WHERE type = 'private'
      ORDER BY id ASC;
      `
    )
    .all();

  return rows.map(row => rowToConversation(row));
}

async function getAllGroupsInvolvingId(
  id: string
): Promise<Array<ConversationType>> {
  const db = getInstance();
  const rows: ConversationRows = db
    .prepare<Query>(
      `
      SELECT json, profileLastFetchedAt
      FROM conversations WHERE
        type = 'group' AND
        members LIKE $id
      ORDER BY id ASC;
      `
    )
    .all({
      id: `%${id}%`,
    });

  return rows.map(row => rowToConversation(row));
}

async function searchConversations(
  query: string,
  { limit }: { limit?: number } = {}
): Promise<Array<ConversationType>> {
  const db = getInstance();
  const rows: ConversationRows = db
    .prepare<Query>(
      `
      SELECT json, profileLastFetchedAt
      FROM conversations WHERE
        (
          e164 LIKE $query OR
          name LIKE $query OR
          profileFullName LIKE $query
        )
      ORDER BY active_at DESC
      LIMIT $limit
      `
    )
    .all({
      query: `%${query}%`,
      limit: limit || 100,
    });

  return rows.map(row => rowToConversation(row));
}

async function searchMessages(
  query: string,
  { limit }: { limit?: number } = {}
): Promise<Array<SearchResultMessageType>> {
  const db = getInstance();
  const rows: Array<SearchResultMessageType> = db
    .prepare<Query>(
      `
      SELECT
        messages.json,
        snippet(messages_fts, -1, '<<left>>', '<<right>>', '...', 10) as snippet
      FROM messages_fts
      INNER JOIN messages on messages_fts.id = messages.id
      WHERE
        messages_fts match $query
      ORDER BY messages.received_at DESC, messages.sent_at DESC
      LIMIT $limit;
      `
    )
    .all({
      query,
      limit: limit || 500,
    });

  return rows;
}

async function searchMessagesInConversation(
  query: string,
  conversationId: string,
  { limit }: { limit?: number } = {}
): Promise<Array<SearchResultMessageType>> {
  const db = getInstance();
  const rows = db
    .prepare<Query>(
      `
      SELECT
        messages.json,
        snippet(messages_fts, -1, '<<left>>', '<<right>>', '...', 10) as snippet
      FROM messages_fts
      INNER JOIN messages on messages_fts.id = messages.id
      WHERE
        messages_fts match $query AND
        messages.conversationId = $conversationId
      ORDER BY messages.received_at DESC, messages.sent_at DESC
      LIMIT $limit;
      `
    )
    .all({
      query,
      conversationId,
      limit: limit || 100,
    });

  return rows;
}

async function getMessageCount(conversationId?: string): Promise<number> {
  const db = getInstance();
  let row: { 'count(*)': number } | undefined;

  if (conversationId !== undefined) {
    row = db
      .prepare<Query>(
        `
        SELECT count(*)
        FROM messages
        WHERE conversationId = $conversationId;
        `
      )
      .get({ conversationId });
  } else {
    row = db.prepare<EmptyQuery>('SELECT count(*) FROM messages;').get();
  }

  if (!row) {
    throw new Error('getMessageCount: Unable to get count of messages');
  }

  return row['count(*)'];
}

async function saveMessage(
  data: MessageType,
  options: { forceSave?: boolean; alreadyInTransaction?: boolean } = {}
): Promise<string> {
  const db = getInstance();

  const { forceSave, alreadyInTransaction } = options;

  if (!alreadyInTransaction) {
    return db.transaction(() => {
      return saveMessage(data, {
        ...options,
        alreadyInTransaction: true,
      });
    })();
  }

  const {
    body,
    conversationId,
    expires_at,
    hasAttachments,
    hasFileAttachments,
    hasVisualMediaAttachments,
    id,
    isErased,
    isViewOnce,
    received_at,
    schemaVersion,
    sent_at,
    source,
    sourceUuid,
    sourceDevice,
    type,
    unread,
    expireTimer,
    expirationStartTimestamp,
  } = data;

  const payload = {
    id,
    json: objectToJSON(data),

    body: body || null,
    conversationId,
    expirationStartTimestamp: expirationStartTimestamp || null,
    expires_at: expires_at || null,
    expireTimer: expireTimer || null,
    hasAttachments: hasAttachments ? 1 : 0,
    hasFileAttachments: hasFileAttachments ? 1 : 0,
    hasVisualMediaAttachments: hasVisualMediaAttachments ? 1 : 0,
    isErased: isErased ? 1 : 0,
    isViewOnce: isViewOnce ? 1 : 0,
    received_at: received_at || null,
    schemaVersion,
    sent_at: sent_at || null,
    source: source || null,
    sourceUuid: sourceUuid || null,
    sourceDevice: sourceDevice || null,
    type: type || null,
    unread: unread ? 1 : 0,
  };

  if (id && !forceSave) {
    prepare(
      db,
      `
      UPDATE messages SET
        id = $id,
        json = $json,

        body = $body,
        conversationId = $conversationId,
        expirationStartTimestamp = $expirationStartTimestamp,
        expires_at = $expires_at,
        expireTimer = $expireTimer,
        hasAttachments = $hasAttachments,
        hasFileAttachments = $hasFileAttachments,
        hasVisualMediaAttachments = $hasVisualMediaAttachments,
        isErased = $isErased,
        isViewOnce = $isViewOnce,
        received_at = $received_at,
        schemaVersion = $schemaVersion,
        sent_at = $sent_at,
        source = $source,
        sourceUuid = $sourceUuid,
        sourceDevice = $sourceDevice,
        type = $type,
        unread = $unread
      WHERE id = $id;
      `
    ).run(payload);
    db.prepare<Query>('DELETE FROM messages_fts WHERE id = $id;').run({
      id,
    });

    if (body) {
      db.prepare<Query>(
        `
        INSERT INTO messages_fts(
          id,
          body
        ) VALUES (
          $id,
          $body
        );
        `
      ).run({
        id,
        body,
      });
    }

    return id;
  }

  const toCreate = {
    ...data,
    id: id || generateUUID(),
  };

  db.prepare<Query>('DELETE FROM messages_fts WHERE id = $id;').run({
    id,
  });

  prepare(
    db,
    `
    INSERT INTO messages (
      id,
      json,

      body,
      conversationId,
      expirationStartTimestamp,
      expires_at,
      expireTimer,
      hasAttachments,
      hasFileAttachments,
      hasVisualMediaAttachments,
      isErased,
      isViewOnce,
      received_at,
      schemaVersion,
      sent_at,
      source,
      sourceUuid,
      sourceDevice,
      type,
      unread
    ) values (
      $id,
      $json,

      $body,
      $conversationId,
      $expirationStartTimestamp,
      $expires_at,
      $expireTimer,
      $hasAttachments,
      $hasFileAttachments,
      $hasVisualMediaAttachments,
      $isErased,
      $isViewOnce,
      $received_at,
      $schemaVersion,
      $sent_at,
      $source,
      $sourceUuid,
      $sourceDevice,
      $type,
      $unread
    );
    `
  ).run({
    ...payload,
    id: toCreate.id,
    json: objectToJSON(toCreate),
  });
  db.prepare<Query>(
    `
    INSERT INTO messages_fts(
      id,
      body
    ) VALUES (
      $id,
      $body
    );
    `
  ).run({
    id,
    body,
  });

  return toCreate.id;
}

async function saveMessages(
  arrayOfMessages: Array<MessageType>,
  { forceSave }: { forceSave?: boolean } = {}
): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    for (const message of arrayOfMessages) {
      saveMessage(message, { forceSave, alreadyInTransaction: true });
    }
  })();
}

async function removeMessage(id: string): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    db.prepare<Query>('DELETE FROM messages WHERE id = id;').run({ id });
    db.prepare<Query>('DELETE FROM messages_fts WHERE id = id;').run({
      id,
    });
  })();
}

async function removeMessages(ids: Array<string>): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    db.prepare<ArrayQuery>(
      `
      DELETE FROM messages
      WHERE id IN ( ${ids.map(() => '?').join(', ')} );
      `
    ).run(ids);
    db.prepare<ArrayQuery>(
      `
      DELETE FROM messages_fts
      WHERE id IN ( ${ids.map(() => '?').join(', ')} );
      `
    ).run(ids);
  })();
}

async function getMessageById(id: string): Promise<MessageType | undefined> {
  const db = getInstance();
  const row = db.prepare<Query>('SELECT * FROM messages WHERE id = $id;').get({
    id,
  });

  if (!row) {
    return undefined;
  }

  return jsonToObject(row.json);
}

async function _getAllMessages(): Promise<Array<MessageType>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<EmptyQuery>('SELECT json FROM messages ORDER BY id ASC;')
    .all();

  return rows.map(row => jsonToObject(row.json));
}

async function getAllMessageIds(): Promise<Array<string>> {
  const db = getInstance();
  const rows: Array<{ id: string }> = db
    .prepare<EmptyQuery>('SELECT id FROM messages ORDER BY id ASC;')
    .all();

  return rows.map(row => row.id);
}

async function getMessageBySender({
  source,
  sourceUuid,
  sourceDevice,
  sent_at,
}: {
  source: string;
  sourceUuid: string;
  sourceDevice: string;
  sent_at: number;
}): Promise<Array<MessageType>> {
  const db = getInstance();
  const rows: JSONRows = prepare(
    db,
    `
    SELECT json FROM messages WHERE
      (source = $source OR sourceUuid = $sourceUuid) AND
      sourceDevice = $sourceDevice AND
      sent_at = $sent_at;
    `
  ).all({
    source,
    sourceUuid,
    sourceDevice,
    sent_at,
  });

  return rows.map(row => jsonToObject(row.json));
}

async function getUnreadByConversation(
  conversationId: string
): Promise<Array<MessageType>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<Query>(
      `
      SELECT json FROM messages WHERE
        unread = $unread AND
        conversationId = $conversationId
      ORDER BY received_at DESC, sent_at DESC;
      `
    )
    .all({
      unread: 1,
      conversationId,
    });

  return rows.map(row => jsonToObject(row.json));
}

async function getOlderMessagesByConversation(
  conversationId: string,
  {
    limit = 100,
    receivedAt = Number.MAX_VALUE,
    sentAt = Number.MAX_VALUE,
    messageId,
  }: {
    limit?: number;
    receivedAt?: number;
    sentAt?: number;
    messageId?: string;
  } = {}
): Promise<Array<MessageTypeUnhydrated>> {
  const db = getInstance();
  let rows: JSONRows;

  if (messageId) {
    rows = db
      .prepare<Query>(
        `
        SELECT json FROM messages WHERE
          conversationId = $conversationId AND
          id != $messageId AND
          (
            (received_at = $received_at AND sent_at < $sent_at) OR
            received_at < $received_at
          )
        ORDER BY received_at DESC, sent_at DESC
        LIMIT $limit;
        `
      )
      .all({
        conversationId,
        received_at: receivedAt,
        sent_at: sentAt,
        limit,
        messageId,
      });
  } else {
    rows = db
      .prepare<Query>(
        `
        SELECT json FROM messages WHERE
        conversationId = $conversationId AND
        (
          (received_at = $received_at AND sent_at < $sent_at) OR
          received_at < $received_at
        )
        ORDER BY received_at DESC, sent_at DESC
        LIMIT $limit;
        `
      )
      .all({
        conversationId,
        received_at: receivedAt,
        sent_at: sentAt,
        limit,
      });
  }

  return rows.reverse();
}

async function getNewerMessagesByConversation(
  conversationId: string,
  {
    limit = 100,
    receivedAt = 0,
    sentAt = 0,
  }: { limit?: number; receivedAt?: number; sentAt?: number } = {}
): Promise<Array<MessageTypeUnhydrated>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<Query>(
      `
      SELECT json FROM messages WHERE
        conversationId = $conversationId AND
        (
          (received_at = $received_at AND sent_at > $sent_at) OR
          received_at > $received_at
        )
      ORDER BY received_at ASC, sent_at ASC
      LIMIT $limit;
      `
    )
    .all({
      conversationId,
      received_at: receivedAt,
      sent_at: sentAt,
      limit,
    });

  return rows;
}
function getOldestMessageForConversation(
  conversationId: string
): MessageMetricsType | undefined {
  const db = getInstance();
  const row = db
    .prepare<Query>(
      `
      SELECT * FROM messages WHERE
        conversationId = $conversationId
      ORDER BY received_at ASC, sent_at ASC
      LIMIT 1;
      `
    )
    .get({
      conversationId,
    });

  if (!row) {
    return undefined;
  }

  return row;
}
function getNewestMessageForConversation(
  conversationId: string
): MessageMetricsType | undefined {
  const db = getInstance();
  const row = db
    .prepare<Query>(
      `
      SELECT * FROM messages WHERE
        conversationId = $conversationId
      ORDER BY received_at DESC, sent_at DESC
      LIMIT 1;
      `
    )
    .get({
      conversationId,
    });

  if (!row) {
    return undefined;
  }

  return row;
}

async function getLastConversationActivity({
  conversationId,
  ourConversationId,
}: {
  conversationId: string;
  ourConversationId: string;
}): Promise<MessageType | undefined> {
  const db = getInstance();
  const row = db
    .prepare<Query>(
      `
      SELECT * FROM messages
      WHERE
        conversationId = $conversationId AND
        (type IS NULL
          OR
          type NOT IN (
            'profile-change',
            'verified-change',
            'message-history-unsynced',
            'keychange',
            'group-v1-migration'
          )
        ) AND
        (
          json_extract(json, '$.expirationTimerUpdate.fromSync') IS NULL
          OR
          json_extract(json, '$.expirationTimerUpdate.fromSync') != 1
        ) AND NOT
        (
          type = 'group-v2-change' AND
          json_extract(json, '$.groupV2Change.from') != $ourConversationId AND
          json_extract(json, '$.groupV2Change.details.length') = 1 AND
          json_extract(json, '$.groupV2Change.details[0].type') = 'member-remove' AND
          json_extract(json, '$.groupV2Change.details[0].conversationId') != $ourConversationId
        )
      ORDER BY received_at DESC, sent_at DESC
      LIMIT 1;
      `
    )
    .get({
      conversationId,
      ourConversationId,
    });

  if (!row) {
    return undefined;
  }

  return jsonToObject(row.json);
}
async function getLastConversationPreview({
  conversationId,
  ourConversationId,
}: {
  conversationId: string;
  ourConversationId: string;
}): Promise<MessageType | undefined> {
  const db = getInstance();
  const row = db
    .prepare<Query>(
      `
      SELECT * FROM messages
      WHERE
        conversationId = $conversationId AND
        (
          type IS NULL
          OR
          type NOT IN (
            'profile-change',
            'verified-change',
            'message-history-unsynced',
            'group-v1-migration'
          )
        ) AND NOT
        (
          type = 'group-v2-change' AND
          json_extract(json, '$.groupV2Change.from') != $ourConversationId AND
          json_extract(json, '$.groupV2Change.details.length') = 1 AND
          json_extract(json, '$.groupV2Change.details[0].type') = 'member-remove' AND
          json_extract(json, '$.groupV2Change.details[0].conversationId') != $ourConversationId
        )
      ORDER BY received_at DESC, sent_at DESC
      LIMIT 1;
      `
    )
    .get({
      conversationId,
      ourConversationId,
    });

  if (!row) {
    return undefined;
  }

  return jsonToObject(row.json);
}
function getOldestUnreadMessageForConversation(
  conversationId: string
): MessageMetricsType | undefined {
  const db = getInstance();
  const row = db
    .prepare<Query>(
      `
      SELECT * FROM messages WHERE
        conversationId = $conversationId AND
        unread = 1
      ORDER BY received_at ASC, sent_at ASC
      LIMIT 1;
      `
    )
    .get({
      conversationId,
    });

  if (!row) {
    return undefined;
  }

  return row;
}

function getTotalUnreadForConversation(conversationId: string): number {
  const db = getInstance();
  const row = db
    .prepare<Query>(
      `
      SELECT count(id)
      FROM messages
      WHERE
        conversationId = $conversationId AND
        unread = 1;
      `
    )
    .get({
      conversationId,
    });

  if (!row) {
    throw new Error('getTotalUnreadForConversation: Unable to get count');
  }

  return row['count(id)'];
}

async function getMessageMetricsForConversation(
  conversationId: string
): Promise<ConversationMetricsType> {
  const oldest = getOldestMessageForConversation(conversationId);
  const newest = getNewestMessageForConversation(conversationId);
  const oldestUnread = getOldestUnreadMessageForConversation(conversationId);
  const totalUnread = getTotalUnreadForConversation(conversationId);

  return {
    oldest: oldest ? pick(oldest, ['received_at', 'sent_at', 'id']) : undefined,
    newest: newest ? pick(newest, ['received_at', 'sent_at', 'id']) : undefined,
    oldestUnread: oldestUnread
      ? pick(oldestUnread, ['received_at', 'sent_at', 'id'])
      : undefined,
    totalUnread,
  };
}

async function hasGroupCallHistoryMessage(
  conversationId: string,
  eraId: string
): Promise<boolean> {
  const db = getInstance();

  const row: { 'count(*)': number } | undefined = db
    .prepare<Query>(
      `
      SELECT count(*) FROM messages
      WHERE conversationId = $conversationId
      AND type = 'call-history'
      AND json_extract(json, '$.callHistoryDetails.callMode') = 'Group'
      AND json_extract(json, '$.callHistoryDetails.eraId') = $eraId
      LIMIT 1;
      `
    )
    .get({
      conversationId,
      eraId,
    });

  if (row) {
    return Boolean(row['count(*)']);
  }
  return false;
}

async function migrateConversationMessages(
  obsoleteId: string,
  currentId: string
): Promise<void> {
  const db = getInstance();

  db.prepare<Query>(
    `
    UPDATE messages SET
      conversationId = $currentId,
      json = json_set(json, '$.conversationId', $currentId)
    WHERE conversationId = $obsoleteId;
    `
  ).run({
    obsoleteId,
    currentId,
  });
}

async function getMessagesBySentAt(
  sentAt: number
): Promise<Array<MessageType>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<Query>(
      `
      SELECT json FROM messages
      WHERE sent_at = $sent_at
      ORDER BY received_at DESC, sent_at DESC;
      `
    )
    .all({
      sent_at: sentAt,
    });

  return rows.map(row => jsonToObject(row.json));
}

async function getExpiredMessages(): Promise<Array<MessageType>> {
  const db = getInstance();
  const now = Date.now();

  const rows: JSONRows = db
    .prepare<Query>(
      `
      SELECT json FROM messages WHERE
        expires_at IS NOT NULL AND
        expires_at <= $expires_at
      ORDER BY expires_at ASC;
      `
    )
    .all({
      expires_at: now,
    });

  return rows.map(row => jsonToObject(row.json));
}

async function getOutgoingWithoutExpiresAt(): Promise<Array<MessageType>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<EmptyQuery>(
      `
      SELECT json FROM messages
      INDEXED BY messages_without_timer
      WHERE
        expireTimer > 0 AND
        expires_at IS NULL AND
        type IS 'outgoing'
      ORDER BY expires_at ASC;
      `
    )
    .all();

  return rows.map(row => jsonToObject(row.json));
}

async function getNextExpiringMessage(): Promise<MessageType | undefined> {
  const db = getInstance();

  // Note: we avoid 'IS NOT NULL' here because it does seem to bypass our index
  const rows: JSONRows = db
    .prepare<EmptyQuery>(
      `
      SELECT json FROM messages
      WHERE expires_at > 0
      ORDER BY expires_at ASC
      LIMIT 1;
      `
    )
    .all();

  if (!rows || rows.length < 1) {
    return undefined;
  }

  return jsonToObject(rows[0].json);
}

async function getNextTapToViewMessageToAgeOut(): Promise<
  MessageType | undefined
> {
  const db = getInstance();
  const rows = db
    .prepare<EmptyQuery>(
      `
      SELECT json FROM messages
      WHERE
        isViewOnce = 1
        AND (isErased IS NULL OR isErased != 1)
      ORDER BY received_at ASC, sent_at ASC
      LIMIT 1;
      `
    )
    .all();

  if (!rows || rows.length < 1) {
    return undefined;
  }

  return jsonToObject(rows[0].json);
}

async function getTapToViewMessagesNeedingErase(): Promise<Array<MessageType>> {
  const db = getInstance();
  const THIRTY_DAYS_AGO = Date.now() - 30 * 24 * 60 * 60 * 1000;

  const rows: JSONRows = db
    .prepare<Query>(
      `
      SELECT json
      FROM messages
      WHERE
        isViewOnce = 1
        AND (isErased IS NULL OR isErased != 1)
        AND received_at <= $THIRTY_DAYS_AGO
      ORDER BY received_at ASC, sent_at ASC;
      `
    )
    .all({
      THIRTY_DAYS_AGO,
    });

  return rows.map(row => jsonToObject(row.json));
}

async function saveUnprocessed(
  data: UnprocessedType,
  { forceSave }: { forceSave?: boolean } = {}
): Promise<string> {
  const db = getInstance();
  const { id, timestamp, version, attempts, envelope } = data;
  if (!id) {
    throw new Error('saveUnprocessed: id was falsey');
  }

  if (forceSave) {
    prepare(
      db,
      `
      INSERT INTO unprocessed (
        id,
        timestamp,
        version,
        attempts,
        envelope
      ) values (
        $id,
        $timestamp,
        $version,
        $attempts,
        $envelope
      );
      `
    ).run({
      id,
      timestamp,
      version,
      attempts,
      envelope,
    });

    return id;
  }

  prepare(
    db,
    `
    UPDATE unprocessed SET
      timestamp = $timestamp,
      version = $version,
      attempts = $attempts,
      envelope = $envelope
    WHERE id = $id;
    `
  ).run({
    id,
    timestamp,
    version,
    attempts,
    envelope,
  });

  return id;
}

async function saveUnprocesseds(
  arrayOfUnprocessed: Array<UnprocessedType>,
  { forceSave }: { forceSave?: boolean } = {}
): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    for (const unprocessed of arrayOfUnprocessed) {
      saveUnprocessed(unprocessed, { forceSave });
    }
  })();
}

async function updateUnprocessedAttempts(
  id: string,
  attempts: number
): Promise<void> {
  const db = getInstance();
  db.prepare<Query>(
    `
    UPDATE unprocessed
    SET attempts = $attempts
    WHERE id = $id;
    `
  ).run({
    id,
    attempts,
  });
}
async function updateUnprocessedWithData(
  id: string,
  data: UnprocessedType
): Promise<void> {
  const db = getInstance();
  const { source, sourceUuid, sourceDevice, serverTimestamp, decrypted } = data;

  prepare(
    db,
    `
    UPDATE unprocessed SET
      source = $source,
      sourceUuid = $sourceUuid,
      sourceDevice = $sourceDevice,
      serverTimestamp = $serverTimestamp,
      decrypted = $decrypted
    WHERE id = $id;
    `
  ).run({
    id,
    source: source || null,
    sourceUuid: sourceUuid || null,
    sourceDevice: sourceDevice || null,
    serverTimestamp: serverTimestamp || null,
    decrypted: decrypted || null,
  });
}
async function updateUnprocessedsWithData(
  arrayOfUnprocessed: Array<{ id: string; data: UnprocessedType }>
): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    for (const { id, data } of arrayOfUnprocessed) {
      updateUnprocessedWithData(id, data);
    }
  })();
}

async function getUnprocessedById(
  id: string
): Promise<UnprocessedType | undefined> {
  const db = getInstance();
  const row = db
    .prepare<Query>('SELECT * FROM unprocessed WHERE id = $id;')
    .get({
      id,
    });

  return row;
}

async function getUnprocessedCount(): Promise<number> {
  const db = getInstance();
  const row = db.prepare<EmptyQuery>('SELECT count(*) from unprocessed;').get();

  if (!row) {
    throw new Error('getMessageCount: Unable to get count of unprocessed');
  }

  return row['count(*)'];
}

async function getAllUnprocessed(): Promise<Array<UnprocessedType>> {
  const db = getInstance();
  const rows = db
    .prepare<EmptyQuery>(
      `
      SELECT *
      FROM unprocessed
      ORDER BY timestamp ASC;
      `
    )
    .all();

  return rows;
}

async function removeUnprocessed(id: string | Array<string>): Promise<void> {
  const db = getInstance();

  if (!Array.isArray(id)) {
    prepare(db, 'DELETE FROM unprocessed WHERE id = id;').run({ id });

    return;
  }

  if (!id.length) {
    throw new Error('removeUnprocessed: No ids to delete!');
  }

  // Our node interface doesn't seem to allow you to replace one single ? with an array
  db.prepare<ArrayQuery>(
    `
    DELETE FROM unprocessed
    WHERE id IN ( ${id.map(() => '?').join(', ')} );
    `
  ).run(id);
}

async function removeAllUnprocessed(): Promise<void> {
  const db = getInstance();
  db.prepare<EmptyQuery>('DELETE FROM unprocessed;').run();
}

// Attachment Downloads

const ATTACHMENT_DOWNLOADS_TABLE = 'attachment_downloads';
async function getNextAttachmentDownloadJobs(
  limit?: number,
  options: { timestamp?: number } = {}
): Promise<Array<AttachmentDownloadJobType>> {
  const db = getInstance();
  const timestamp =
    options && options.timestamp ? options.timestamp : Date.now();

  const rows: JSONRows = db
    .prepare<Query>(
      `
      SELECT json
      FROM attachment_downloads
      WHERE pending = 0 AND timestamp < $timestamp
      ORDER BY timestamp DESC
      LIMIT $limit;
      `
    )
    .all({
      limit: limit || 3,
      timestamp,
    });

  return rows.map(row => jsonToObject(row.json));
}
async function saveAttachmentDownloadJob(
  job: AttachmentDownloadJobType
): Promise<void> {
  const db = getInstance();
  const { id, pending, timestamp } = job;
  if (!id) {
    throw new Error(
      'saveAttachmentDownloadJob: Provided job did not have a truthy id'
    );
  }

  db.prepare<Query>(
    `
    INSERT OR REPLACE INTO attachment_downloads (
      id,
      pending,
      timestamp,
      json
    ) values (
      $id,
      $pending,
      $timestamp,
      $json
    )
    `
  ).run({
    id,
    pending,
    timestamp,
    json: objectToJSON(job),
  });
}
async function setAttachmentDownloadJobPending(
  id: string,
  pending: boolean
): Promise<void> {
  const db = getInstance();
  db.prepare<Query>(
    `
    UPDATE attachment_downloads
    SET pending = $pending
    WHERE id = $id;
    `
  ).run({
    id,
    pending: pending ? 1 : 0,
  });
}
async function resetAttachmentDownloadPending(): Promise<void> {
  const db = getInstance();
  db.prepare<EmptyQuery>(
    `
    UPDATE attachment_downloads
    SET pending = 0
    WHERE pending != 0;
    `
  ).run();
}
function removeAttachmentDownloadJob(id: string): Promise<void> {
  return removeById(ATTACHMENT_DOWNLOADS_TABLE, id);
}
function removeAllAttachmentDownloadJobs(): Promise<void> {
  return removeAllFromTable(ATTACHMENT_DOWNLOADS_TABLE);
}

// Stickers

async function createOrUpdateStickerPack(pack: StickerPackType): Promise<void> {
  const db = getInstance();
  const {
    attemptedStatus,
    author,
    coverStickerId,
    createdAt,
    downloadAttempts,
    id,
    installedAt,
    key,
    lastUsed,
    status,
    stickerCount,
    title,
  } = pack;
  if (!id) {
    throw new Error(
      'createOrUpdateStickerPack: Provided data did not have a truthy id'
    );
  }

  const rows = db
    .prepare<Query>(
      `
      SELECT id
      FROM sticker_packs
      WHERE id = $id;
      `
    )
    .all({ id });
  const payload = {
    attemptedStatus,
    author,
    coverStickerId,
    createdAt: createdAt || Date.now(),
    downloadAttempts: downloadAttempts || 1,
    id,
    installedAt,
    key,
    lastUsed: lastUsed || null,
    status,
    stickerCount,
    title,
  };

  if (rows && rows.length) {
    db.prepare<Query>(
      `
      UPDATE sticker_packs SET
        attemptedStatus = $attemptedStatus,
        author = $author,
        coverStickerId = $coverStickerId,
        createdAt = $createdAt,
        downloadAttempts = $downloadAttempts,
        installedAt = $installedAt,
        key = $key,
        lastUsed = $lastUsed,
        status = $status,
        stickerCount = $stickerCount,
        title = $title
      WHERE id = $id;
      `
    ).run(payload);

    return;
  }

  db.prepare<Query>(
    `
    INSERT INTO sticker_packs (
      attemptedStatus,
      author,
      coverStickerId,
      createdAt,
      downloadAttempts,
      id,
      installedAt,
      key,
      lastUsed,
      status,
      stickerCount,
      title
    ) values (
      $attemptedStatus,
      $author,
      $coverStickerId,
      $createdAt,
      $downloadAttempts,
      $id,
      $installedAt,
      $key,
      $lastUsed,
      $status,
      $stickerCount,
      $title
    )
    `
  ).run(payload);
}
async function updateStickerPackStatus(
  id: string,
  status: StickerPackStatusType,
  options?: { timestamp: number }
): Promise<void> {
  const db = getInstance();
  const timestamp = options ? options.timestamp || Date.now() : Date.now();
  const installedAt = status === 'installed' ? timestamp : null;

  db.prepare<Query>(
    `
    UPDATE sticker_packs
    SET status = $status, installedAt = $installedAt
    WHERE id = $id;
    )
    `
  ).run({
    id,
    status,
    installedAt,
  });
}
async function clearAllErrorStickerPackAttempts(): Promise<void> {
  const db = getInstance();

  db.prepare<EmptyQuery>(
    `
    UPDATE sticker_packs
    SET downloadAttempts = 0
    WHERE status = 'error';
    `
  ).run();
}
async function createOrUpdateSticker(sticker: StickerType): Promise<void> {
  const db = getInstance();
  const {
    emoji,
    height,
    id,
    isCoverOnly,
    lastUsed,
    packId,
    path,
    width,
  } = sticker;

  if (!isNumber(id)) {
    throw new Error(
      'createOrUpdateSticker: Provided data did not have a numeric id'
    );
  }
  if (!packId) {
    throw new Error(
      'createOrUpdateSticker: Provided data did not have a truthy id'
    );
  }

  db.prepare<Query>(
    `
    INSERT OR REPLACE INTO stickers (
      emoji,
      height,
      id,
      isCoverOnly,
      lastUsed,
      packId,
      path,
      width
    ) values (
      $emoji,
      $height,
      $id,
      $isCoverOnly,
      $lastUsed,
      $packId,
      $path,
      $width
    )
    `
  ).run({
    emoji,
    height,
    id,
    isCoverOnly,
    lastUsed,
    packId,
    path,
    width,
  });
}
async function updateStickerLastUsed(
  packId: string,
  stickerId: number,
  lastUsed: number
): Promise<void> {
  const db = getInstance();
  db.prepare<Query>(
    `
    UPDATE stickers
    SET lastUsed = $lastUsed
    WHERE id = $id AND packId = $packId;
    `
  ).run({
    id: stickerId,
    packId,
    lastUsed,
  });
  db.prepare<Query>(
    `
    UPDATE sticker_packs
    SET lastUsed = $lastUsed
    WHERE id = $id;
    `
  ).run({
    id: packId,
    lastUsed,
  });
}
async function addStickerPackReference(
  messageId: string,
  packId: string
): Promise<void> {
  const db = getInstance();

  if (!messageId) {
    throw new Error(
      'addStickerPackReference: Provided data did not have a truthy messageId'
    );
  }
  if (!packId) {
    throw new Error(
      'addStickerPackReference: Provided data did not have a truthy packId'
    );
  }

  db.prepare<Query>(
    `
    INSERT OR REPLACE INTO sticker_references (
      messageId,
      packId
    ) values (
      $messageId,
      $packId
    )
    `
  ).all({
    messageId,
    packId,
  });
}
async function deleteStickerPackReference(
  messageId: string,
  packId: string
): Promise<Array<string>> {
  const db = getInstance();

  if (!messageId) {
    throw new Error(
      'addStickerPackReference: Provided data did not have a truthy messageId'
    );
  }
  if (!packId) {
    throw new Error(
      'addStickerPackReference: Provided data did not have a truthy packId'
    );
  }

  return db
    .transaction(() => {
      // We use an immediate transaction here to immediately acquire an exclusive lock,
      //   which would normally only happen when we did our first write.

      // We need this to ensure that our five queries are all atomic, with no
      // other changes happening while we do it:
      // 1. Delete our target messageId/packId references
      // 2. Check the number of references still pointing at packId
      // 3. If that number is zero, get pack from sticker_packs database
      // 4. If it's not installed, then grab all of its sticker paths
      // 5. If it's not installed, then sticker pack (which cascades to all
      //    stickers and references)
      db.prepare<Query>(
        `
        DELETE FROM sticker_references
        WHERE messageId = $messageId AND packId = $packId;
        `
      ).run({
        messageId,
        packId,
      });

      const countRow = db
        .prepare<Query>(
          `
          SELECT count(*) FROM sticker_references
          WHERE packId = $packId;
          `
        )
        .get({ packId });
      if (!countRow) {
        throw new Error(
          'deleteStickerPackReference: Unable to get count of references'
        );
      }
      const count = countRow['count(*)'];
      if (count > 0) {
        return [];
      }

      const packRow: { status: StickerPackStatusType } = db
        .prepare<Query>(
          `
          SELECT status FROM sticker_packs
          WHERE id = $packId;
          `
        )
        .get({ packId });
      if (!packRow) {
        console.log('deleteStickerPackReference: did not find referenced pack');
        return [];
      }
      const { status } = packRow;

      if (status === 'installed') {
        return [];
      }

      const stickerPathRows: Array<{ path: string }> = db
        .prepare<Query>(
          `
          SELECT path FROM stickers
          WHERE packId = $packId;
          `
        )
        .all({
          packId,
        });
      db.prepare<Query>(
        `
        DELETE FROM sticker_packs
        WHERE id = $packId;
        `
      ).run({
        packId,
      });

      return (stickerPathRows || []).map(row => row.path);
    })
    .immediate();
}

async function deleteStickerPack(packId: string): Promise<Array<string>> {
  const db = getInstance();

  if (!packId) {
    throw new Error(
      'deleteStickerPack: Provided data did not have a truthy packId'
    );
  }

  return db
    .transaction(() => {
      // We use an immediate transaction here to immediately acquire an exclusive lock,
      //   which would normally only happen when we did our first write.

      // We need this to ensure that our two queries are atomic, with no other changes
      //   happening while we do it:
      // 1. Grab all of target pack's sticker paths
      // 2. Delete sticker pack (which cascades to all stickers and references)

      const stickerPathRows: Array<{ path: string }> = db
        .prepare<Query>(
          `
          SELECT path FROM stickers
          WHERE packId = $packId;
          `
        )
        .all({
          packId,
        });
      db.prepare<Query>(
        `
        DELETE FROM sticker_packs
        WHERE id = $packId;
        `
      ).run({ packId });

      return (stickerPathRows || []).map(row => row.path);
    })
    .immediate();
}

async function getStickerCount(): Promise<number> {
  const db = getInstance();

  const row = db.prepare<EmptyQuery>('SELECT count(*) from stickers;').get();

  if (!row) {
    throw new Error('getStickerCount: Unable to get count of stickers');
  }

  return row['count(*)'];
}
async function getAllStickerPacks(): Promise<Array<StickerPackType>> {
  const db = getInstance();

  const rows = db
    .prepare<EmptyQuery>(
      `
      SELECT * FROM sticker_packs
      ORDER BY installedAt DESC, createdAt DESC
      `
    )
    .all();

  return rows || [];
}
async function getAllStickers(): Promise<Array<StickerType>> {
  const db = getInstance();

  const rows = db
    .prepare<EmptyQuery>(
      `
      SELECT * FROM stickers
      ORDER BY packId ASC, id ASC
      `
    )
    .all();

  return rows || [];
}
async function getRecentStickers({ limit }: { limit?: number } = {}): Promise<
  Array<StickerType>
> {
  const db = getInstance();

  // Note: we avoid 'IS NOT NULL' here because it does seem to bypass our index
  const rows = db
    .prepare<Query>(
      `
      SELECT stickers.* FROM stickers
      JOIN sticker_packs on stickers.packId = sticker_packs.id
      WHERE stickers.lastUsed > 0 AND sticker_packs.status = 'installed'
      ORDER BY stickers.lastUsed DESC
      LIMIT $limit
      `
    )
    .all({
      limit: limit || 24,
    });

  return rows || [];
}

// Emojis
async function updateEmojiUsage(
  shortName: string,
  timeUsed: number = Date.now()
): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    const rows = db
      .prepare<Query>(
        `
        SELECT * FROM emojis
        WHERE shortName = $shortName;
        `
      )
      .get({
        shortName,
      });

    if (rows) {
      db.prepare<Query>(
        `
        UPDATE emojis
        SET lastUsage = $timeUsed
        WHERE shortName = $shortName;
        `
      ).run({ shortName, timeUsed });
    } else {
      db.prepare<Query>(
        `
        INSERT INTO emojis(shortName, lastUsage)
        VALUES ($shortName, $timeUsed);
        `
      ).run({ shortName, timeUsed });
    }
  })();
}

async function getRecentEmojis(limit = 32): Promise<Array<EmojiType>> {
  const db = getInstance();
  const rows = db
    .prepare<Query>(
      `
      SELECT *
      FROM emojis
      ORDER BY lastUsage DESC
      LIMIT $limit;
      `
    )
    .all({ limit });

  return rows || [];
}

// All data in database
async function removeAll(): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    db.exec(`
      DELETE FROM conversations;
      DELETE FROM identityKeys;
      DELETE FROM items;
      DELETE FROM messages;
      DELETE FROM preKeys;
      DELETE FROM sessions;
      DELETE FROM signedPreKeys;
      DELETE FROM unprocessed;
      DELETE FROM attachment_downloads;
      DELETE FROM messages_fts;
      DELETE FROM stickers;
      DELETE FROM sticker_packs;
      DELETE FROM sticker_references;
    `);
  })();
}

// Anything that isn't user-visible data
async function removeAllConfiguration(): Promise<void> {
  const db = getInstance();

  db.transaction(() => {
    db.exec(`
      DELETE FROM identityKeys;
      DELETE FROM items;
      DELETE FROM preKeys;
      DELETE FROM sessions;
      DELETE FROM signedPreKeys;
      DELETE FROM unprocessed;
    `);
  })();
}

async function getMessagesNeedingUpgrade(
  limit: number,
  { maxVersion }: { maxVersion: number }
): Promise<Array<MessageType>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<Query>(
      `
      SELECT json
      FROM messages
      WHERE schemaVersion IS NULL OR schemaVersion < $maxVersion
      LIMIT $limit;
      `
    )
    .all({
      maxVersion,
      limit,
    });

  return rows.map(row => jsonToObject(row.json));
}

async function getMessagesWithVisualMediaAttachments(
  conversationId: string,
  { limit }: { limit: number }
): Promise<Array<MessageType>> {
  const db = getInstance();
  const rows: JSONRows = db
    .prepare<Query>(
      `
      SELECT json FROM messages WHERE
        conversationId = $conversationId AND
        hasVisualMediaAttachments = 1
      ORDER BY received_at DESC, sent_at DESC
      LIMIT $limit;
      `
    )
    .all({
      conversationId,
      limit,
    });

  return rows.map(row => jsonToObject(row.json));
}

async function getMessagesWithFileAttachments(
  conversationId: string,
  { limit }: { limit: number }
): Promise<Array<MessageType>> {
  const db = getInstance();
  const rows = db
    .prepare<Query>(
      `
      SELECT json FROM messages WHERE
        conversationId = $conversationId AND
        hasFileAttachments = 1
      ORDER BY received_at DESC, sent_at DESC
      LIMIT $limit;
      `
    )
    .all({
      conversationId,
      limit,
    });

  return map(rows, row => jsonToObject(row.json));
}

function getExternalFilesForMessage(message: MessageType): Array<string> {
  const { attachments, contact, quote, preview, sticker } = message;
  const files: Array<string> = [];

  forEach(attachments, attachment => {
    const { path: file, thumbnail, screenshot } = attachment;
    if (file) {
      files.push(file);
    }

    if (thumbnail && thumbnail.path) {
      files.push(thumbnail.path);
    }

    if (screenshot && screenshot.path) {
      files.push(screenshot.path);
    }
  });

  if (quote && quote.attachments && quote.attachments.length) {
    forEach(quote.attachments, attachment => {
      const { thumbnail } = attachment;

      if (thumbnail && thumbnail.path) {
        files.push(thumbnail.path);
      }
    });
  }

  if (contact && contact.length) {
    forEach(contact, item => {
      const { avatar } = item;

      if (avatar && avatar.avatar && avatar.avatar.path) {
        files.push(avatar.avatar.path);
      }
    });
  }

  if (preview && preview.length) {
    forEach(preview, item => {
      const { image } = item;

      if (image && image.path) {
        files.push(image.path);
      }
    });
  }

  if (sticker && sticker.data && sticker.data.path) {
    files.push(sticker.data.path);

    if (sticker.data.thumbnail && sticker.data.thumbnail.path) {
      files.push(sticker.data.thumbnail.path);
    }
  }

  return files;
}

function getExternalFilesForConversation(
  conversation: Pick<ConversationType, 'avatar' | 'profileAvatar'>
): Array<string> {
  const { avatar, profileAvatar } = conversation;
  const files: Array<string> = [];

  if (avatar && avatar.path) {
    files.push(avatar.path);
  }

  if (profileAvatar && profileAvatar.path) {
    files.push(profileAvatar.path);
  }

  return files;
}

function getExternalDraftFilesForConversation(
  conversation: Pick<ConversationType, 'draftAttachments'>
): Array<string> {
  const draftAttachments = conversation.draftAttachments || [];
  const files: Array<string> = [];

  forEach(draftAttachments, attachment => {
    const { path: file, screenshotPath } = attachment;
    if (file) {
      files.push(file);
    }

    if (screenshotPath) {
      files.push(screenshotPath);
    }
  });

  return files;
}

async function removeKnownAttachments(
  allAttachments: Array<string>
): Promise<Array<string>> {
  const db = getInstance();
  const lookup: Dictionary<boolean> = fromPairs(
    map(allAttachments, file => [file, true])
  );
  const chunkSize = 50;

  const total = getMessageCount();
  console.log(
    `removeKnownAttachments: About to iterate through ${total} messages`
  );

  let count = 0;
  let complete = false;
  let id: string | number = '';

  while (!complete) {
    const rows: JSONRows = db
      .prepare<Query>(
        `
        SELECT json FROM messages
        WHERE id > $id
        ORDER BY id ASC
        LIMIT $chunkSize;
        `
      )
      .all({
        id,
        chunkSize,
      });

    const messages: Array<MessageType> = rows.map(row =>
      jsonToObject(row.json)
    );
    messages.forEach(message => {
      const externalFiles = getExternalFilesForMessage(message);
      forEach(externalFiles, file => {
        delete lookup[file];
      });
    });

    const lastMessage: MessageType | undefined = last(messages);
    if (lastMessage) {
      ({ id } = lastMessage);
    }
    complete = messages.length < chunkSize;
    count += messages.length;
  }

  console.log(`removeKnownAttachments: Done processing ${count} messages`);

  complete = false;
  count = 0;
  // Though conversations.id is a string, this ensures that, when coerced, this
  //   value is still a string but it's smaller than every other string.
  id = 0;

  const conversationTotal = getConversationCount();
  console.log(
    `removeKnownAttachments: About to iterate through ${conversationTotal} conversations`
  );

  while (!complete) {
    const rows = db
      .prepare<Query>(
        `
        SELECT json FROM conversations
        WHERE id > $id
        ORDER BY id ASC
        LIMIT $chunkSize;
        `
      )
      .all({
        id,
        chunkSize,
      });

    const conversations: Array<ConversationType> = map(rows, row =>
      jsonToObject(row.json)
    );
    conversations.forEach(conversation => {
      const externalFiles = getExternalFilesForConversation(conversation);
      externalFiles.forEach(file => {
        delete lookup[file];
      });
    });

    const lastMessage: ConversationType | undefined = last(conversations);
    if (lastMessage) {
      ({ id } = lastMessage);
    }
    complete = conversations.length < chunkSize;
    count += conversations.length;
  }

  console.log(`removeKnownAttachments: Done processing ${count} conversations`);

  return Object.keys(lookup);
}

async function removeKnownStickers(
  allStickers: Array<string>
): Promise<Array<string>> {
  const db = getInstance();
  const lookup: Dictionary<boolean> = fromPairs(
    map(allStickers, file => [file, true])
  );
  const chunkSize = 50;

  const total = getStickerCount();
  console.log(
    `removeKnownStickers: About to iterate through ${total} stickers`
  );

  let count = 0;
  let complete = false;
  let rowid = 0;

  while (!complete) {
    const rows: Array<{ rowid: number; path: string }> = db
      .prepare<Query>(
        `
        SELECT rowid, path FROM stickers
        WHERE rowid > $rowid
        ORDER BY rowid ASC
        LIMIT $chunkSize;
        `
      )
      .all({
        rowid,
        chunkSize,
      });

    const files: Array<string> = rows.map(row => row.path);
    files.forEach(file => {
      delete lookup[file];
    });

    const lastSticker = last(rows);
    if (lastSticker) {
      ({ rowid } = lastSticker);
    }
    complete = rows.length < chunkSize;
    count += rows.length;
  }

  console.log(`removeKnownStickers: Done processing ${count} stickers`);

  return Object.keys(lookup);
}

async function removeKnownDraftAttachments(
  allStickers: Array<string>
): Promise<Array<string>> {
  const db = getInstance();
  const lookup: Dictionary<boolean> = fromPairs(
    map(allStickers, file => [file, true])
  );
  const chunkSize = 50;

  const total = getConversationCount();
  console.log(
    `removeKnownDraftAttachments: About to iterate through ${total} conversations`
  );

  let complete = false;
  let count = 0;
  // Though conversations.id is a string, this ensures that, when coerced, this
  //   value is still a string but it's smaller than every other string.
  let id: number | string = 0;

  while (!complete) {
    const rows: JSONRows = db
      .prepare<Query>(
        `
        SELECT json FROM conversations
        WHERE id > $id
        ORDER BY id ASC
        LIMIT $chunkSize;
        `
      )
      .all({
        id,
        chunkSize,
      });

    const conversations: Array<ConversationType> = rows.map(row =>
      jsonToObject(row.json)
    );
    conversations.forEach(conversation => {
      const externalFiles = getExternalDraftFilesForConversation(conversation);
      externalFiles.forEach(file => {
        delete lookup[file];
      });
    });

    const lastMessage: ConversationType | undefined = last(conversations);
    if (lastMessage) {
      ({ id } = lastMessage);
    }
    complete = conversations.length < chunkSize;
    count += conversations.length;
  }

  console.log(
    `removeKnownDraftAttachments: Done processing ${count} conversations`
  );

  return Object.keys(lookup);
}