// Copyright 2022 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import type { ElectronApplication, Page } from 'playwright';
import { _electron as electron } from 'playwright';
import { EventEmitter, once } from 'events';
import pTimeout from 'p-timeout';

import type {
  IPCRequest as ChallengeRequestType,
  IPCResponse as ChallengeResponseType,
} from '../challenge';
import type { ReceiptType } from '../types/Receipt';
import { SECOND } from '../util/durations';
import { drop } from '../util/drop';
import type { MessageAttributesType } from '../model-types';

export type AppLoadedInfoType = Readonly<{
  loadTime: number;
  messagesPerSec: number;
}>;

export type MessageSendInfoType = Readonly<{
  timestamp: number;
  delta: number;
}>;

export type ConversationOpenInfoType = Readonly<{
  delta: number;
}>;

export type ReceiptsInfoType = Readonly<{
  type: ReceiptType;
  timestamps: Array<number>;
}>;

export type StorageServiceInfoType = Readonly<{
  manifestVersion: number;
}>;

export type AppOptionsType = Readonly<{
  main: string;
  args: ReadonlyArray<string>;
  config: string;
}>;

const WAIT_FOR_EVENT_TIMEOUT = 30 * SECOND;

export class App extends EventEmitter {
  private privApp: ElectronApplication | undefined;

  constructor(private readonly options: AppOptionsType) {
    super();
  }

  public async start(): Promise<void> {
    try {
      // launch the electron processs
      this.privApp = await electron.launch({
        executablePath: this.options.main,
        args: this.options.args.slice(),
        env: {
          ...process.env,
          MOCK_TEST: 'true',
          SIGNAL_CI_CONFIG: this.options.config,
        },
        locale: 'en',
        timeout: 30 * SECOND,
      });

      // wait for the first window to load
      await pTimeout(
        (async () => {
          const page = await this.getWindow();
          if (process.env.TRACING) {
            await page.context().tracing.start({
              name: 'tracing',
              screenshots: true,
              snapshots: true,
            });
          }
          await page?.waitForLoadState('load');
        })(),
        20 * SECOND
      );
    } catch (e) {
      this.privApp?.process().kill('SIGKILL');
      throw e;
    }

    this.privApp.on('close', () => this.emit('close'));

    drop(this.printLoop());
  }

  public async waitForProvisionURL(): Promise<string> {
    return this.waitForEvent('provisioning-url');
  }

  public async waitForDbInitialized(): Promise<void> {
    return this.waitForEvent('db-initialized');
  }

  public async waitUntilLoaded(): Promise<AppLoadedInfoType> {
    return this.waitForEvent('app-loaded');
  }

  public async waitForContactSync(): Promise<void> {
    return this.waitForEvent('contactSync');
  }

  public async waitForBackupImportComplete(): Promise<{ duration: number }> {
    return this.waitForEvent('backupImportComplete');
  }

  public async waitForMessageSend(): Promise<MessageSendInfoType> {
    return this.waitForEvent('message:send-complete');
  }

  public async waitForConversationOpen(): Promise<ConversationOpenInfoType> {
    return this.waitForEvent('conversation:open');
  }

  public async waitForChallenge(): Promise<ChallengeRequestType> {
    return this.waitForEvent('challenge');
  }

  public async waitForReceipts(): Promise<ReceiptsInfoType> {
    return this.waitForEvent('receipts');
  }

  public async waitForStorageService(): Promise<StorageServiceInfoType> {
    return this.waitForEvent('storageServiceComplete');
  }

  public async waitForManifestVersion(version: number): Promise<void> {
    // eslint-disable-next-line no-constant-condition
    while (true) {
      // eslint-disable-next-line no-await-in-loop
      const { manifestVersion } = await this.waitForStorageService();
      if (manifestVersion >= version) {
        break;
      }
    }
  }

  public async solveChallenge(response: ChallengeResponseType): Promise<void> {
    const window = await this.getWindow();

    await window.evaluate(
      `window.SignalCI.solveChallenge(${JSON.stringify(response)})`
    );
  }

  private async checkForFatalTestErrors(): Promise<void> {
    const count = await this.getPendingEventCount('fatalTestError');
    if (count === 0) {
      return;
    }
    for (let i = 0; i < count; i += 1) {
      // eslint-disable-next-line no-await-in-loop, no-console
      console.error(await this.waitForEvent('fatalTestError'));
    }
    throw new Error('App had fatal test errors');
  }

  public async close(): Promise<void> {
    try {
      await this.checkForFatalTestErrors();
    } finally {
      await this.app.close();
    }
  }

  public async getWindow(): Promise<Page> {
    return this.app.firstWindow();
  }

  public async openSignalRoute(url: URL | string): Promise<void> {
    const window = await this.getWindow();
    await window.evaluate(
      `window.SignalCI.openSignalRoute(${JSON.stringify(url.toString())})`
    );
  }

  public async getMessagesBySentAt(
    timestamp: number
  ): Promise<Array<MessageAttributesType>> {
    const window = await this.getWindow();
    return window.evaluate(`window.SignalCI.getMessagesBySentAt(${timestamp})`);
  }

  public async uploadBackup(): Promise<void> {
    const window = await this.getWindow();
    await window.evaluate('window.SignalCI.uploadBackup()');
  }

  public async migrateAllMessages(): Promise<void> {
    const window = await this.getWindow();
    await window.evaluate('window.SignalCI.migrateAllMessages()');
  }

  public async unlink(): Promise<void> {
    const window = await this.getWindow();
    return window.evaluate('window.SignalCI.unlink()');
  }

  public async waitForUnlink(): Promise<void> {
    return this.waitForEvent('unlinkCleanupComplete');
  }

  public async waitForConversationOpenComplete(): Promise<void> {
    return this.waitForEvent('conversationOpenComplete');
  }

  // EventEmitter types

  public override on(type: 'close', callback: () => void): this;

  public override on(
    type: string | symbol,
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    listener: (...args: Array<any>) => void
  ): this {
    return super.on(type, listener);
  }

  public override emit(type: 'close'): boolean;

  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  public override emit(type: string | symbol, ...args: Array<any>): boolean {
    return super.emit(type, ...args);
  }

  public async getPendingEventCount(event: string): Promise<number> {
    const window = await this.getWindow();
    const result = await window.evaluate(
      `window.SignalCI.getPendingEventCount(${JSON.stringify(event)})`
    );

    return Number(result);
  }

  //
  // Private
  //

  private async waitForEvent<T>(
    event: string,
    timeout = WAIT_FOR_EVENT_TIMEOUT
  ): Promise<T> {
    const window = await this.getWindow();

    const result = await window.evaluate(
      `window.SignalCI.waitForEvent(${JSON.stringify(event)})`,
      { timeout }
    );

    return result as T;
  }

  private get app(): ElectronApplication {
    if (!this.privApp) {
      throw new Error('Call ElectronWrap.start() first');
    }

    return this.privApp;
  }

  private async printLoop(): Promise<void> {
    const kClosed: unique symbol = Symbol('kClosed');
    const onClose = (async (): Promise<typeof kClosed> => {
      try {
        await once(this, 'close');
      } catch {
        // Ignore
      }
      return kClosed;
    })();

    // eslint-disable-next-line no-constant-condition
    while (true) {
      try {
        // eslint-disable-next-line no-await-in-loop
        const value = await Promise.race([
          this.waitForEvent<string>('print', 0),
          onClose,
        ]);

        if (value === kClosed) {
          break;
        }

        // eslint-disable-next-line no-console
        console.error(`CI.print: ${value}`);
      } catch {
        // Ignore errors
      }
    }
  }
}