/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
ChromeUtils.import("resource://gre/modules/Services.jsm");

ChromeUtils.import("resource:///modules/syncedtabs/SyncedTabsDeckStore.js");
ChromeUtils.import("resource:///modules/syncedtabs/SyncedTabsDeckView.js");
ChromeUtils.import("resource:///modules/syncedtabs/SyncedTabsListStore.js");
ChromeUtils.import("resource:///modules/syncedtabs/TabListComponent.js");
ChromeUtils.import("resource:///modules/syncedtabs/TabListView.js");
let { getChromeWindow } = ChromeUtils.import("resource:///modules/syncedtabs/util.js", {});

XPCOMUtils.defineLazyGetter(this, "FxAccountsCommon", function() {
  return ChromeUtils.import("resource://gre/modules/FxAccountsCommon.js", {});
});

let log = ChromeUtils.import("resource://gre/modules/Log.jsm", {})
            .Log.repository.getLogger("Sync.RemoteTabs");

var EXPORTED_SYMBOLS = [
  "SyncedTabsDeckComponent"
];

/* SyncedTabsDeckComponent
 * This component instantiates views and storage objects as well as defines
 * behaviors that will be passed down to the views. This helps keep the views
 * isolated and easier to test.
 */

function SyncedTabsDeckComponent({
  window, SyncedTabs, fxAccounts, deckStore, listStore, listComponent, DeckView, getChromeWindowMock,
}) {
  this._window = window;
  this._SyncedTabs = SyncedTabs;
  this._fxAccounts = fxAccounts;
  this._DeckView = DeckView || SyncedTabsDeckView;
  // used to stub during tests
  this._getChromeWindow = getChromeWindowMock || getChromeWindow;

  this._deckStore = deckStore || new SyncedTabsDeckStore();
  this._syncedTabsListStore = listStore || new SyncedTabsListStore(SyncedTabs);
  this.tabListComponent = listComponent || new TabListComponent({
    window: this._window,
    store: this._syncedTabsListStore,
    View: TabListView,
    SyncedTabs,
    clipboardHelper: Cc["@mozilla.org/widget/clipboardhelper;1"]
                       .getService(Ci.nsIClipboardHelper),
    getChromeWindow: this._getChromeWindow,
  });
}

SyncedTabsDeckComponent.prototype = {
  PANELS: {
    TABS_CONTAINER: "tabs-container",
    TABS_FETCHING: "tabs-fetching",
    LOGIN_FAILED: "reauth",
    NOT_AUTHED_INFO: "notAuthedInfo",
    SINGLE_DEVICE_INFO: "singleDeviceInfo",
    TABS_DISABLED: "tabs-disabled",
    UNVERIFIED: "unverified"
  },

  get container() {
    return this._deckView ? this._deckView.container : null;
  },

  init() {
    Services.obs.addObserver(this, this._SyncedTabs.TOPIC_TABS_CHANGED);
    Services.obs.addObserver(this, FxAccountsCommon.ONLOGIN_NOTIFICATION);
    Services.obs.addObserver(this, "weave:service:login:change");
    // If the Sync service is not ready, in init() > updatePanel() we will
    // show a blank screen. If tab syncing is disabled, we will not get any other
    // ui-refreshing notifications! We listen to :ready in order to check again
    // if this engine is disabled and refresh the UI one last time.
    Services.obs.addObserver(this, "weave:service:ready");

    // Go ahead and trigger sync
    this._SyncedTabs.syncTabs()
                    .catch(Cu.reportError);

    this._deckView = new this._DeckView(this._window, this.tabListComponent, {
      onConnectDeviceClick: event => this.openConnectDevice(event),
      onSyncPrefClick: event => this.openSyncPrefs(event)
    });

    this._deckStore.on("change", state => this._deckView.render(state));
    // Trigger the initial rendering of the deck view
    // Object.values only in nightly
    this._deckStore.setPanels(Object.keys(this.PANELS).map(k => this.PANELS[k]));
    // Set the initial panel to display
    this.updatePanel();
  },

  uninit() {
    Services.obs.removeObserver(this, this._SyncedTabs.TOPIC_TABS_CHANGED);
    Services.obs.removeObserver(this, FxAccountsCommon.ONLOGIN_NOTIFICATION);
    Services.obs.removeObserver(this, "weave:service:login:change");
    Services.obs.removeObserver(this, "weave:service:ready");
    this._deckView.destroy();
  },

  observe(subject, topic, data) {
    switch (topic) {
      case this._SyncedTabs.TOPIC_TABS_CHANGED:
        this._syncedTabsListStore.getData();
        this.updatePanel();
        break;
      case "weave:service:ready":
        Services.obs.removeObserver(this, "weave:service:ready");
        // Intended fallthrough.
      case FxAccountsCommon.ONLOGIN_NOTIFICATION:
      case "weave:service:login:change":
        this.updatePanel();
        break;
      default:
        break;
    }
  },

  // There's no good way to mock fxAccounts in browser tests where it's already
  // been instantiated, so we have this method for stubbing.
  _getSignedInUser() {
    return this._fxAccounts.getSignedInUser();
  },

  getPanelStatus() {
    return this._getSignedInUser().then(user => {
      if (!user) {
        return this.PANELS.NOT_AUTHED_INFO;
      }
      if (this._SyncedTabs.loginFailed) {
        return this.PANELS.LOGIN_FAILED;
      }
      if (!user.verified) {
        return this.PANELS.UNVERIFIED;
      }
      if (!this._SyncedTabs.isConfiguredToSyncTabs) {
        return this.PANELS.TABS_DISABLED;
      }
      if (!this._SyncedTabs.hasSyncedThisSession) {
        return this.PANELS.TABS_FETCHING;
      }
      return this._SyncedTabs.getTabClients().then(clients => {
        if (clients.length) {
          return this.PANELS.TABS_CONTAINER;
        }
        return this.PANELS.SINGLE_DEVICE_INFO;
      });
    })
    .catch(err => {
      Cu.reportError(err);
      return this.PANELS.NOT_AUTHED_INFO;
    });
  },

  updatePanel() {
    // return promise for tests
    return this.getPanelStatus()
      .then(panelId => this._deckStore.selectPanel(panelId))
      .catch(Cu.reportError);
  },

  openSyncPrefs() {
    this._getChromeWindow(this._window).gSync.openPrefs("tabs-sidebar");
  },

  openConnectDevice() {
    this._getChromeWindow(this._window).gSync.openConnectAnotherDevice("tabs-sidebar");
  },
};