// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/* eslint-disable rulesdir/no_underscored_properties */

import * as Common from '../common/common.js';
import * as i18n from '../i18n/i18n.js';
import * as SDK from '../sdk/sdk.js';

import {NetworkThrottlingConditionsGroup, ThrottlingPresets} from './ThrottlingPresets.js';  // eslint-disable-line no-unused-vars

export const UIStrings = {
  /**
  *@description Text to indicate something is not enabled
  */
  disabled: 'Disabled',
  /**
  *@description Title for a group of configuration options
  */
  presets: 'Presets',
  /**
  *@description Text in Network Throttling Selector of the Network panel
  */
  custom: 'Custom',
};
const str_ = i18n.i18n.registerUIStrings('mobile_throttling/NetworkThrottlingSelector.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
export class NetworkThrottlingSelector {
  _populateCallback: (arg0: Array<NetworkThrottlingConditionsGroup>) => Array<SDK.NetworkManager.Conditions|null>;
  _selectCallback: (arg0: number) => void;
  _customNetworkConditionsSetting: Common.Settings.Setting<SDK.NetworkManager.Conditions[]>;
  _options!: (SDK.NetworkManager.Conditions|null)[];

  constructor(
      populateCallback: (arg0: Array<NetworkThrottlingConditionsGroup>) => Array<SDK.NetworkManager.Conditions|null>,
      selectCallback: (arg0: number) => void,
      customNetworkConditionsSetting: Common.Settings.Setting<SDK.NetworkManager.Conditions[]>) {
    this._populateCallback = populateCallback;
    this._selectCallback = selectCallback;
    this._customNetworkConditionsSetting = customNetworkConditionsSetting;
    this._customNetworkConditionsSetting.addChangeListener(this._populateOptions, this);
    SDK.NetworkManager.MultitargetNetworkManager.instance().addEventListener(
        SDK.NetworkManager.MultitargetNetworkManager.Events.ConditionsChanged, () => {
          this._networkConditionsChanged();
        }, this);
    this._populateOptions();
  }

  revealAndUpdate(): void {
    Common.Revealer.reveal(this._customNetworkConditionsSetting);
    this._networkConditionsChanged();
  }

  optionSelected(conditions: SDK.NetworkManager.Conditions): void {
    SDK.NetworkManager.MultitargetNetworkManager.instance().setNetworkConditions(conditions);
  }

  _populateOptions(): void {
    const disabledGroup = {title: i18nString(UIStrings.disabled), items: [SDK.NetworkManager.NoThrottlingConditions]};
    const presetsGroup = {title: i18nString(UIStrings.presets), items: ThrottlingPresets.networkPresets};
    const customGroup = {title: i18nString(UIStrings.custom), items: this._customNetworkConditionsSetting.get()};
    this._options = this._populateCallback([disabledGroup, presetsGroup, customGroup]);
    if (!this._networkConditionsChanged()) {
      for (let i = this._options.length - 1; i >= 0; i--) {
        if (this._options[i]) {
          this.optionSelected(this._options[i] as SDK.NetworkManager.Conditions);
          break;
        }
      }
    }
  }

  /**
   * returns false if selected condition no longer exists
   */
  _networkConditionsChanged(): boolean {
    const value = SDK.NetworkManager.MultitargetNetworkManager.instance().networkConditions();
    for (let index = 0; index < this._options.length; ++index) {
      const option = this._options[index];
      if (option && option.download === value.download && option.upload === value.upload &&
          option.latency === value.latency && option.title === value.title) {
        this._selectCallback(index);
        return true;
      }
    }
    return false;
  }
}