/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

var App = require('app');
var stringUtils = require('utils/string_utils');

App.MainAdminStackAndUpgradeController = Em.Controller.extend(App.LocalStorage, {
  name: 'mainAdminStackAndUpgradeController',

  /**
   * @type {Object|null}
   */
  serviceToInstall: null,

  /**
   * @type {object}
   * @default null
   */
  upgradeData: null,

  /**
   * @type {number}
   * @default null
   */
  upgradeId: null,

  /**
   * @type {string}
   * @default null
   */
  upgradeVersion: null,

  /**
   * version that currently applied to server
   * @type {Object|null}
   */
  currentVersion: null,

  /**
   * versions to which cluster could be upgraded
   * @type {Array}
   */
  targetVersions: [],

  /**
   * properties that stored to localStorage to resume wizard progress
   */
  wizardStorageProperties: ['upgradeId', 'upgradeVersion', 'currentVersion'],

  init: function () {
    this.initDBProperties();
  },

  /**
   * restore data from localStorage
   */
  initDBProperties: function () {
    this.get('wizardStorageProperties').forEach(function (property) {
      if (this.getDBProperty(property)) {
        this.set(property, this.getDBProperty(property));
      }
    }, this);
  },

  /**
   * @type {Array}
   */
  services: function() {
    return App.StackService.find().map(function(s) {
      s.set('isInstalled', App.Service.find().someProperty('serviceName', s.get('serviceName')));
      return s;
    });
  }.property('App.router.clusterController.isLoaded'),

  /**
   * launch Add Service wizard
   * @param event
   */
  goToAddService: function (event) {
    this.set('serviceToInstall', event.context);
    App.get('router').transitionTo('main.serviceAdd');
  },

  /**
   * call to fetch cluster stack versions
   * @return {$.ajax}
   */
  loadVersionsInfo: function () {
    return App.ajax.send({
      name: 'admin.stack_versions.all',
      sender: this,
      data: {},
      success: 'loadVersionsInfoSuccessCallback'
    });
  },

  /**
   * parse stack versions and
   * set <code>currentVersion</code>
   * set <code>targetVersions</code>
   * @param data
   */
  loadVersionsInfoSuccessCallback: function (data) {
    var versions = this.parseVersionsData(data);
    var current = versions.findProperty('state', 'CURRENT');
    var targetVersions = versions.without(current).filter(function (version) {
      //Only higher versions that have already been installed to all the hosts are shown
      return (version.state === 'INSTALLED' &&
        stringUtils.compareVersions(version.repository_version, current.repository_version) === 1);
    });
    this.set('currentVersion', current);
    this.set('targetVersions', targetVersions);
  },

  /**
   * parse ClusterStackVersions data to form common structure
   * @param {object} data
   * @return {Array}
   */
  parseVersionsData: function (data) {
    return data.items.map(function (item) {
      item.ClusterStackVersions.repository_name = item.repository_versions[0].RepositoryVersions.display_name;
      item.ClusterStackVersions.repository_id = item.repository_versions[0].RepositoryVersions.id;
      item.ClusterStackVersions.repository_version = item.repository_versions[0].RepositoryVersions.repository_version;
      return item.ClusterStackVersions;
    });
  },

  /**
   * load upgrade tasks by upgrade id
   * @return {$.Deferred}
   * @param {boolean} onlyState
   */
  loadUpgradeData: function (onlyState) {
    var upgradeId = this.get('upgradeId');
    var deferred = $.Deferred();

    if (Em.isNone(upgradeId)) {
      deferred.resolve();
      console.log('Upgrade in INIT state');
    } else {
      App.ajax.send({
        name: (onlyState) ? 'admin.upgrade.state' : 'admin.upgrade.data',
        sender: this,
        data: {
          id: upgradeId
        },
        success: 'loadUpgradeDataSuccessCallback'
      }).then(deferred.resolve);
    }
    return deferred.promise();
  },

  /**
   * parse and push upgrade tasks to controller
   * @param data
   */
  loadUpgradeDataSuccessCallback: function (data) {
    App.set('upgradeState', data.Upgrade.request_status);
    this.setDBProperty('upgradeState', data.Upgrade.request_status);
    if (data.upgrade_groups) {
      this.updateUpgradeData(data);
    }
  },

  /**
   * update data of Upgrade
   * @param {object} newData
   */
  updateUpgradeData: function (newData) {
    var oldData = this.get('upgradeData'),
        groupsMap = {},
        itemsMap = {},
        tasksMap = {};

    if (Em.isNone(oldData)) {
      this.initUpgradeData(newData);
    } else {
      //create entities maps
      newData.upgrade_groups.forEach(function (newGroup) {
        groupsMap[newGroup.UpgradeGroup.group_id] = newGroup.UpgradeGroup;
        newGroup.upgrade_items.forEach(function (item) {
          itemsMap[item.UpgradeItem.stage_id] = item.UpgradeItem;
          item.tasks.forEach(function (task) {
            tasksMap[task.Tasks.id] = task.Tasks;
          });
        })
      });

      //update existed entities with new data
      oldData.upgradeGroups.forEach(function (oldGroup) {
        oldGroup.set('status', groupsMap[oldGroup.get('group_id')].status);
        oldGroup.set('progress_percent', groupsMap[oldGroup.get('group_id')].progress_percent);
        oldGroup.upgradeItems.forEach(function (item) {
          item.set('status', itemsMap[item.get('stage_id')].status);
          item.set('progress_percent', itemsMap[item.get('stage_id')].progress_percent);
          item.tasks.forEach(function (task) {
            task.set('status', tasksMap[task.get('id')].status);
          });
        })
      });
      oldData.set('Upgrade', newData.Upgrade);
    }
  },

  /**
   * change structure of Upgrade
   * In order to maintain nested views in template object should have direct link to its properties, for example
   * item.UpgradeItem.<properties> -> item.<properties>
   * @param {object} newData
   */
  initUpgradeData: function (newData) {
    var upgradeGroups = [];

    //wrap all entities into App.upgradeEntity
    newData.upgrade_groups.forEach(function (newGroup) {
      var oldGroup = App.upgradeEntity.create({type: 'GROUP'}, newGroup.UpgradeGroup);
      var upgradeItems = [];
      newGroup.upgrade_items.forEach(function (item) {
        var oldItem = App.upgradeEntity.create({type: 'ITEM'}, item.UpgradeItem);
        var tasks = [];
        item.tasks.forEach(function (task) {
          tasks.pushObject(App.upgradeEntity.create({type: 'TASK'}, task.Tasks));
        });
        oldItem.set('tasks', tasks);
        upgradeItems.pushObject(oldItem);
      });
      oldGroup.set('upgradeItems', upgradeItems);
      upgradeGroups.pushObject(oldGroup);
    });
    this.set('upgradeData', Em.Object.create({
      upgradeGroups: upgradeGroups,
      Upgrade: newData.Upgrade
    }));
  },

  /**
   * downgrade confirmation popup
   */
  confirmDowngrade: function () {
    var self = this;
    var currentVersion = this.get('currentVersion');
    return App.showConfirmationPopup(
      function() {
        self.downgrade.call(self, currentVersion);
      },
      Em.I18n.t('admin.stackUpgrade.downgrade.body').format(currentVersion.repository_name),
      null,
      Em.I18n.t('admin.stackUpgrade.downgrade.title').format(currentVersion.repository_name),
      Em.I18n.t('admin.stackUpgrade.downgrade.proceed')
    );
  },

  /**
   * make call to start downgrade process
   * @params {object} currentVersion
   */
  downgrade: function (currentVersion) {
    App.ajax.send({
      name: 'admin.downgrade.start',
      sender: this,
      data: {
        value: currentVersion.repository_version,
        label: currentVersion.repository_name
      },
      success: 'upgradeSuccessCallback'
    });
  },

  /**
   * make call to start upgrade process and show popup with current progress
   * @param {object} version
   */
  upgrade: function (version) {
    App.ajax.send({
      name: 'admin.upgrade.start',
      sender: this,
      data: version,
      success: 'upgradeSuccessCallback'
    });
    this.setDBProperty('currentVersion', this.get('currentVersion'));
  },

  /**
   * success callback of <code>upgrade()</code>
   * @param {object} data
   */
  upgradeSuccessCallback: function (data, opt, params) {
    this.set('upgradeId', data.resources[0].Upgrade.request_id);
    this.set('upgradeVersion', params.label);
    this.setDBProperty('upgradeVersion', params.label);
    this.setDBProperty('upgradeId', data.resources[0].Upgrade.request_id);
    this.setDBProperty('upgradeState', 'PENDING');
    App.set('upgradeState', 'PENDING');
    App.clusterStatus.setClusterStatus({
      wizardControllerName: this.get('name'),
      localdb: App.db.data
    });
    this.openUpgradeDialog();
  },

  /**
   * send request for pre upgrade check
   * @param version
   */
  runPreUpgradeCheck: function(version) {
    if (App.get('supports.preUpgradeCheck')) {
      App.ajax.send({
        name: "admin.rolling_upgrade.pre_upgrade_check",
        sender: this,
        data: version,
        success: "runPreUpgradeCheckSuccess"
      });
    } else {
      this.upgrade(version);
    }
  },

  /**
   * success callback of <code>runPreUpgradeCheckSuccess()</code>
   * if there are some fails - it shows popup else run upgrade
   * @param data {object}
   * @param opt {object}
   * @param params {object}
   * @returns {App.ModalPopup|undefined}
   */
  runPreUpgradeCheckSuccess: function (data, opt, params) {
    if (data.items.someProperty('UpgradeChecks.status', "FAIL")) {
      var header = Em.I18n.t('popup.clusterCheck.Upgrade.header').format(params.label);
      var title = Em.I18n.t('popup.clusterCheck.Upgrade.title');
      var alert = Em.I18n.t('popup.clusterCheck.Upgrade.alert');
      App.showClusterCheckPopup(data, header, title, alert);
    } else {
      this.upgrade(params);
    }
  },
  /**
   * make call to resume upgrade process and show popup with current progress
   */
  resumeUpgrade: function () {
    //TODO resume upgrade
    this.openUpgradeDialog();
  },

  /**
   * make call to finish upgrade process
   */
  finalize: function () {
    //TODO execute finalize
    this.finish();
  },

  /**
   * finish upgrade wizard
   * clean auxiliary data
   */
  finish: function () {
    this.set('upgradeId', null);
    this.setDBProperty('upgradeId', undefined);
    this.setDBProperty('upgradeState', 'INIT');
    App.set('upgradeState', 'INIT');
    this.set('upgradeVersion', null);
    this.setDBProperty('upgradeVersion', undefined);
    this.setDBProperty('currentVersion', undefined);
    App.clusterStatus.setClusterStatus({
      localdb: App.db.data
    });
  },

  /**
   * show dialog with tasks of upgrade
   * @return {App.ModalPopup}
   */
  openUpgradeDialog: function () {
    App.router.transitionTo('admin.stackUpgrade');
  }
});