/**
 * Copyright (c) Microsoft Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import * as types from '../../types';
import { BrowserChannel, BrowserInitializer } from '../channels';
import { BrowserContext } from './browserContext';
import { Page } from './page';
import { ChannelOwner } from './channelOwner';
import { ConnectionScope } from './connection';
import { Events } from '../../events';
import { CDPSession } from './cdpSession';

export class Browser extends ChannelOwner<BrowserChannel, BrowserInitializer> {
  readonly _contexts = new Set<BrowserContext>();
  private _isConnected = true;
  private _isClosedOrClosing = false;
  private _closedPromise: Promise<void>;

  static from(browser: BrowserChannel): Browser {
    return (browser as any)._object;
  }

  static fromNullable(browser: BrowserChannel | null): Browser | null {
    return browser ? Browser.from(browser) : null;
  }

  constructor(scope: ConnectionScope, guid: string, initializer: BrowserInitializer) {
    super(scope, guid, initializer, true);
    this._channel.on('close', () => {
      this._isConnected = false;
      this.emit(Events.Browser.Disconnected);
      this._isClosedOrClosing = true;
      this._scope.dispose();
    });
    this._closedPromise = new Promise(f => this.once(Events.Browser.Disconnected, f));
  }

  async newContext(options: types.BrowserContextOptions = {}): Promise<BrowserContext> {
    delete (options as any).logger;
    const context = BrowserContext.from(await this._channel.newContext(options));
    this._contexts.add(context);
    context._browser = this;
    return context;
  }

  contexts(): BrowserContext[] {
    return [...this._contexts];
  }

  async newPage(options: types.BrowserContextOptions = {}): Promise<Page> {
    delete (options as any).logger;
    const context = await this.newContext(options);
    const page = await context.newPage();
    page._ownedContext = context;
    context._ownerPage = page;
    return page;
  }

  isConnected(): boolean {
    return this._isConnected;
  }

  async close(): Promise<void> {
    if (!this._isClosedOrClosing) {
      this._isClosedOrClosing = true;
      await this._channel.close();
    }
    await this._closedPromise;
  }

  async newBrowserCDPSession(): Promise<CDPSession> {
    return CDPSession.from(await this._channel.crNewBrowserCDPSession());
  }

  async startTracing(page?: Page, options: { path?: string; screenshots?: boolean; categories?: string[]; } = {}) {
    await this._channel.crStartTracing({ ...options, page: page ? page._channel : undefined });
  }

  async stopTracing(): Promise<Buffer> {
    return Buffer.from(await this._channel.crStopTracing(), 'base64');
  }
}