/* Copyright 2012 Mozilla Foundation
 *
 * 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 { mozL10n } from './ui_utils';
import { OverlayManager } from './overlay_manager';
import { PasswordResponses } from './pdfjs';

/**
 * @typedef {Object} PasswordPromptOptions
 * @property {string} overlayName - Name of the overlay for the overlay manager.
 * @property {HTMLDivElement} container - Div container for the overlay.
 * @property {HTMLParagraphElement} label - Label containing instructions for
 *                                          entering the password.
 * @property {HTMLInputElement} input - Input field for entering the password.
 * @property {HTMLButtonElement} submitButton - Button for submitting the
 *                                              password.
 * @property {HTMLButtonElement} cancelButton - Button for cancelling password
 *                                              entry.
 */

class PasswordPrompt {
  /**
   * @param {PasswordPromptOptions} options
   */
  constructor(options) {
    this.overlayName = options.overlayName;
    this.container = options.container;
    this.label = options.label;
    this.input = options.input;
    this.submitButton = options.submitButton;
    this.cancelButton = options.cancelButton;

    this.updateCallback = null;
    this.reason = null;

    // Attach the event listeners.
    this.submitButton.addEventListener('click', this.verify.bind(this));
    this.cancelButton.addEventListener('click', this.close.bind(this));
    this.input.addEventListener('keydown', (e) => {
      if (e.keyCode === 13) { // Enter key
        this.verify();
      }
    });

    OverlayManager.register(this.overlayName, this.container,
                            this.close.bind(this), true);
  }

  open() {
    OverlayManager.open(this.overlayName).then(() => {
      this.input.focus();

      var promptString = mozL10n.get('password_label', null,
        'Enter the password to open this PDF file.');

      if (this.reason === PasswordResponses.INCORRECT_PASSWORD) {
        promptString = mozL10n.get('password_invalid', null,
          'Invalid password. Please try again.');
      }

      this.label.textContent = promptString;
    });
  }

  close() {
    OverlayManager.close(this.overlayName).then(() => {
      this.input.value = '';
    });
  }

  verify() {
    var password = this.input.value;
    if (password && password.length > 0) {
      this.close();
      return this.updateCallback(password);
    }
  }

  setUpdateCallback(updateCallback, reason) {
    this.updateCallback = updateCallback;
    this.reason = reason;
  }
}

export {
  PasswordPrompt,
};