/**
 * Copyright 2017 Google Inc. All rights reserved.
 *
 * 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.
 */

const {assert} = require('./helper');

class Dialog {
  /**
   * @param {!Puppeteer.CDPSession} client
   * @param {string} type
   * @param {string} message
   * @param {(string|undefined)} defaultValue
   */
  constructor(client, type, message, defaultValue = '') {
    this._client = client;
    this._type = type;
    this._message = message;
    this._handled = false;
    this._defaultValue = defaultValue;
  }

  /**
   * @return {string}
   */
  type() {
    return this._type;
  }

  /**
   * @return {string}
   */
  message() {
    return this._message;
  }

  /**
   * @return {string}
   */
  defaultValue() {
    return this._defaultValue;
  }

  /**
   * @param {string=} promptText
   */
  /* async */ accept(promptText) {return (fn => {
  const gen = fn.call(this);
  return new Promise((resolve, reject) => {
    function step(key, arg) {
      let info, value;
      try {
        info = gen[key](arg);
        value = info.value;
      } catch (error) {
        reject(error);
        return;
      }
      if (info.done) {
        resolve(value);
      } else {
        return Promise.resolve(value).then(
            value => {
              step('next', value);
            },
            err => {
              step('throw', err);
            });
      }
    }
    return step('next');
  });
})(function*(){
    assert(!this._handled, 'Cannot accept dialog which is already handled!');
    this._handled = true;
    (yield this._client.send('Page.handleJavaScriptDialog', {
      accept: true,
      promptText: promptText
    }));
  });}

  /* async */ dismiss() {return (fn => {
  const gen = fn.call(this);
  return new Promise((resolve, reject) => {
    function step(key, arg) {
      let info, value;
      try {
        info = gen[key](arg);
        value = info.value;
      } catch (error) {
        reject(error);
        return;
      }
      if (info.done) {
        resolve(value);
      } else {
        return Promise.resolve(value).then(
            value => {
              step('next', value);
            },
            err => {
              step('throw', err);
            });
      }
    }
    return step('next');
  });
})(function*(){
    assert(!this._handled, 'Cannot dismiss dialog which is already handled!');
    this._handled = true;
    (yield this._client.send('Page.handleJavaScriptDialog', {
      accept: false
    }));
  });}
}

Dialog.Type = {
  Alert: 'alert',
  BeforeUnload: 'beforeunload',
  Confirm: 'confirm',
  Prompt: 'prompt'
};

module.exports = {Dialog};