// Copyright 2024 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import type { Database } from '@signalapp/better-sqlite3';
import { CallLinkRootKey } from '@signalapp/ringrtc';
import type { CallLinkStateType, CallLinkType } from '../../types/CallLink';
import {
  callLinkRestrictionsSchema,
  callLinkRecordSchema,
} from '../../types/CallLink';
import {
  callLinkToRecord,
  callLinkFromRecord,
  toAdminKeyBytes,
} from '../../util/callLinks';
import { getReadonlyInstance, getWritableInstance, prepare } from '../Server';
import { sql } from '../util';
import { strictAssert } from '../../util/assert';

export async function callLinkExists(roomId: string): Promise<boolean> {
  const db = getReadonlyInstance();
  const [query, params] = sql`
    SELECT 1
    FROM callLinks
    WHERE roomId = ${roomId};
  `;
  return db.prepare(query).pluck(true).get(params) === 1;
}

export async function getCallLinkByRoomId(
  roomId: string
): Promise<CallLinkType | undefined> {
  const db = getReadonlyInstance();
  const row = prepare(db, 'SELECT * FROM callLinks WHERE roomId = $roomId').get(
    {
      roomId,
    }
  );

  if (!row) {
    return undefined;
  }

  return callLinkFromRecord(callLinkRecordSchema.parse(row));
}

export async function getAllCallLinks(): Promise<ReadonlyArray<CallLinkType>> {
  const db = getReadonlyInstance();
  const [query] = sql`
    SELECT * FROM callLinks;
  `;
  return db
    .prepare(query)
    .all()
    .map(item => callLinkFromRecord(callLinkRecordSchema.parse(item)));
}

function _insertCallLink(db: Database, callLink: CallLinkType): void {
  const { roomId, rootKey } = callLink;
  assertRoomIdMatchesRootKey(roomId, rootKey);

  const data = callLinkToRecord(callLink);
  prepare(
    db,
    `
    INSERT INTO callLinks (
      roomId,
      rootKey,
      adminKey,
      name,
      restrictions,
      revoked,
      expiration
    ) VALUES (
      $roomId,
      $rootKey,
      $adminKey,
      $name,
      $restrictions,
      $revoked,
      $expiration
    )
    `
  ).run(data);
}

export async function insertCallLink(callLink: CallLinkType): Promise<void> {
  const db = await getWritableInstance();
  _insertCallLink(db, callLink);
}

export async function updateCallLinkState(
  roomId: string,
  callLinkState: CallLinkStateType
): Promise<CallLinkType> {
  const { name, restrictions, expiration, revoked } = callLinkState;
  const db = await getWritableInstance();
  const restrictionsValue = callLinkRestrictionsSchema.parse(restrictions);
  const [query, params] = sql`
    UPDATE callLinks
    SET
      name = ${name},
      restrictions = ${restrictionsValue},
      expiration = ${expiration},
      revoked = ${revoked ? 1 : 0}
    WHERE roomId = ${roomId}
    RETURNING *;
  `;
  const row = db.prepare(query).get(params);
  strictAssert(row, 'Expected row to be returned');
  return callLinkFromRecord(callLinkRecordSchema.parse(row));
}

export async function updateCallLinkAdminKeyByRoomId(
  roomId: string,
  adminKey: string
): Promise<void> {
  const db = await getWritableInstance();
  const adminKeyBytes = toAdminKeyBytes(adminKey);
  prepare(
    db,
    `
    UPDATE callLinks
    SET adminKey = $adminKeyBytes
    WHERE roomId = $roomId;
    `
  ).run({ roomId, adminKeyBytes });
}

function assertRoomIdMatchesRootKey(roomId: string, rootKey: string): void {
  const derivedRoomId = CallLinkRootKey.parse(rootKey)
    .deriveRoomId()
    .toString('hex');
  strictAssert(
    roomId === derivedRoomId,
    'passed roomId must match roomId derived from root key'
  );
}