// Copyright 2014 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.

cr.define('gcmInternals', function() {
  'use strict';

  var isRecording = false;

  /**
   * If the info dictionary has property prop, then set the text content of
   * element to the value of this property. Otherwise clear the content.
   * @param {!Object} info A dictionary of device infos to be displayed.
   * @param {string} prop Name of the property.
   * @param {string} elementId The id of a HTML element.
   */
  function setIfExists(info, prop, elementId) {
    var element = $(elementId);
    if (!element)
      return;

    if (info[prop] !== undefined) {
      element.textContent = info[prop];
    } else {
      element.textContent = '';
    }
  }

  /**
   * Display device informations.
   * @param {!Object} info A dictionary of device infos to be displayed.
   */
  function displayDeviceInfo(info) {
    setIfExists(info, 'androidId', 'android-id');
    setIfExists(info, 'profileServiceCreated', 'profile-service-created');
    setIfExists(info, 'gcmEnabled', 'gcm-enabled');
    setIfExists(info, 'gcmClientCreated', 'gcm-client-created');
    setIfExists(info, 'gcmClientState', 'gcm-client-state');
    setIfExists(info, 'connectionClientCreated', 'connection-client-created');
    setIfExists(info, 'connectionState', 'connection-state');
    setIfExists(info, 'lastCheckin', 'last-checkin');
    setIfExists(info, 'nextCheckin', 'next-checkin');
    setIfExists(info, 'registeredAppIds', 'registered-app-ids');
    setIfExists(info, 'sendQueueSize', 'send-queue-size');
    setIfExists(info, 'resendQueueSize', 'resend-queue-size');
  }

  /**
   * Remove all the child nodes of the element.
   * @param {HTMLElement} element A HTML element.
   */
  function removeAllChildNodes(element) {
    element.textContent = '';
  }

  /**
   * For each item in line, add a row to the table. Each item is actually a list
   * of sub-items; each of which will have a corresponding cell created in that
   * row, and the sub-item will be displayed in the cell.
   * @param {HTMLElement} table A HTML tbody element.
   * @param {!Object} list A list of list of item.
   */
  function addRows(table, list) {
    for (var i = 0; i < list.length; ++i) {
      var row = document.createElement('tr');

      // The first element is always a timestamp.
      var cell = document.createElement('td');
      var d = new Date(list[i][0]);
      cell.textContent = d;
      row.appendChild(cell);

      for (var j = 1; j < list[i].length; ++j) {
        var cell = document.createElement('td');
        cell.textContent = list[i][j];
        row.appendChild(cell);
      }
      table.appendChild(row);
    }
  }

  /**
   * Refresh all displayed information.
   */
  function refreshAll() {
    chrome.send('getGcmInternalsInfo', [false]);
  }

  /**
   * Toggle the isRecording variable and send it to browser.
   */
  function setRecording() {
    isRecording = !isRecording;
    chrome.send('setGcmInternalsRecording', [isRecording]);
  }

  /**
   * Clear all the activity logs.
   */
  function clearLogs() {
    chrome.send('getGcmInternalsInfo', [true]);
  }

  function initialize() {
    $('recording').disabled = true;
    $('refresh').onclick = refreshAll;
    $('recording').onclick = setRecording;
    $('clear-logs').onclick = clearLogs;
    chrome.send('getGcmInternalsInfo', [false]);

    // Recording defaults to on.
    chrome.send('setGcmInternalsRecording', [true]);
  }

  /**
   * Refresh the log html table by clearing it first. If data is not empty, then
   * it will be used to populate the table.
   * @param {string} tableId ID of the log html table.
   * @param {!Object} data A list of list of data items.
   */
  function refreshLogTable(tableId, data) {
    var element = $(tableId);
    if (!element)
      return;

    removeAllChildNodes(element);
    if (data !== undefined)
      addRows(element, data);
  }

  /**
   * Callback function accepting a dictionary of info items to be displayed.
   * @param {!Object} infos A dictionary of info items to be displayed.
   */
  function setGcmInternalsInfo(infos) {
    isRecording = infos.isRecording;
    if (isRecording)
      $('recording').textContent = 'Stop Recording';
    else
      $('recording').textContent = 'Start Recording';
    $('recording').disabled = false;
    if (infos.deviceInfo !== undefined) {
      displayDeviceInfo(infos.deviceInfo);
    }

    refreshLogTable('checkin-info', infos.checkinInfo);
    refreshLogTable('connection-info', infos.connectionInfo);
    refreshLogTable('registration-info', infos.registrationInfo);
    refreshLogTable('receive-info', infos.receiveInfo);
    refreshLogTable('decryption-failure-info', infos.decryptionFailureInfo);
    refreshLogTable('send-info', infos.sendInfo);
  }

  // Return an object with all of the exports.
  return {
    initialize: initialize,
    setGcmInternalsInfo: setGcmInternalsInfo,
  };
});

document.addEventListener('DOMContentLoaded', gcmInternals.initialize);