// Copyright (c) 2012 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.

/**
 * @fileoverview Oobe update screen implementation.
 */

login.createScreen('UpdateScreen', 'update', function() {
  var USER_ACTION_CANCEL_UPDATE_SHORTCUT = 'cancel-update';
  var CONTEXT_KEY_TIME_LEFT_SEC = 'time-left-sec';
  var CONTEXT_KEY_SHOW_TIME_LEFT = 'show-time-left';
  var CONTEXT_KEY_UPDATE_MESSAGE = 'update-msg';
  var CONTEXT_KEY_SHOW_CURTAIN = 'show-curtain';
  var CONTEXT_KEY_SHOW_PROGRESS_MESSAGE = 'show-progress-msg';
  var CONTEXT_KEY_PROGRESS = 'progress';
  var CONTEXT_KEY_PROGRESS_MESSAGE = 'progress-msg';
  var CONTEXT_KEY_CANCEL_UPDATE_SHORTCUT_ENABLED = 'cancel-update-enabled';

  return {
    EXTERNAL_API: [],

    /** @override */
    decorate: function() {
      var self = this;

      this.context.addObserver(CONTEXT_KEY_TIME_LEFT_SEC,
                               function(time_left_sec) {
        self.setEstimatedTimeLeft(time_left_sec);
      });
      this.context.addObserver(CONTEXT_KEY_SHOW_TIME_LEFT,
                               function(show_time_left) {
        self.showEstimatedTimeLeft(show_time_left);
      });
      this.context.addObserver(CONTEXT_KEY_UPDATE_MESSAGE,
                               function(update_msg) {
        self.setUpdateMessage(update_msg);
      });
      this.context.addObserver(CONTEXT_KEY_SHOW_CURTAIN,
                               function(show_curtain) {
        self.showUpdateCurtain(show_curtain);
      });
      this.context.addObserver(CONTEXT_KEY_SHOW_PROGRESS_MESSAGE,
                               function(show_progress_msg) {
        self.showProgressMessage(show_progress_msg);
      });
      this.context.addObserver(CONTEXT_KEY_PROGRESS,
                               function(progress) {
        self.setUpdateProgress(progress);
      });
      this.context.addObserver(CONTEXT_KEY_PROGRESS_MESSAGE,
                               function(progress_msg) {
        self.setProgressMessage(progress_msg);
      });
      this.context.addObserver(CONTEXT_KEY_CANCEL_UPDATE_SHORTCUT_ENABLED,
                               function(enabled) {
        $('update-cancel-hint').hidden = !enabled;
      });
    },

    /**
     * Header text of the screen.
     * @type {string}
     */
    get header() {
      return loadTimeData.getString('updateScreenTitle');
    },

    /**
     * Cancels the screen.
     */
    cancel: function() {
      // It's safe to act on the accelerator even if it's disabled on official
      // builds, since Chrome will just ignore this user action in that case.
      var updateCancelHint = $('update-cancel-hint').firstElementChild;
      updateCancelHint.textContent =
          loadTimeData.getString('cancelledUpdateMessage');
      this.send(login.Screen.CALLBACK_USER_ACTED,
                USER_ACTION_CANCEL_UPDATE_SHORTCUT);
    },

    /**
     * Sets update's progress bar value.
     * @param {number} progress Percentage of the progress bar.
     */
    setUpdateProgress: function(progress) {
      $('update-progress-bar').value = progress;
    },

    /**
     * Shows or hides downloading ETA message.
     * @param {boolean} visible Are ETA message visible?
     */
    showEstimatedTimeLeft: function(visible) {
      $('progress-message').hidden = visible;
      $('estimated-time-left').hidden = !visible;
    },

    /**
     * Sets estimated time left until download will complete.
     * @param {number} seconds Time left in seconds.
     */
    setEstimatedTimeLeft: function(seconds) {
      var minutes = Math.ceil(seconds / 60);
      var message = '';
      if (minutes > 60) {
        message = loadTimeData.getString('downloadingTimeLeftLong');
      } else if (minutes > 55) {
        message = loadTimeData.getString('downloadingTimeLeftStatusOneHour');
      } else if (minutes > 20) {
        message = loadTimeData.getStringF('downloadingTimeLeftStatusMinutes',
                                          Math.ceil(minutes / 5) * 5);
      } else if (minutes > 1) {
        message = loadTimeData.getStringF('downloadingTimeLeftStatusMinutes',
                                          minutes);
      } else {
        message = loadTimeData.getString('downloadingTimeLeftSmall');
      }
      $('estimated-time-left').textContent =
        loadTimeData.getStringF('downloading', message);
    },

    /**
     * Shows or hides info message below progress bar.
     * @param {boolean} visible Are message visible?
     */
    showProgressMessage: function(visible) {
      $('estimated-time-left').hidden = visible;
      $('progress-message').hidden = !visible;
    },

    /**
     * Sets message below progress bar.
     * @param {string} message Message that should be shown.
     */
    setProgressMessage: function(message) {
      $('progress-message').innerText = message;
    },

    /**
     * Sets update message, which is shown above the progress bar.
     * @param {text} message Message which is shown by the label.
     */
    setUpdateMessage: function(message) {
      $('update-upper-label').textContent = message;
    },

    /**
     * Shows or hides update curtain.
     * @param {boolean} visible Are curtains visible?
     */
    showUpdateCurtain: function(visible) {
      $('update-screen-curtain').hidden = !visible;
      $('update-screen-main').hidden = visible;
    }
  };
});