/** @jsx React.DOM */

/* 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/. */

/*jshint newcap:false*/
/*global loop:true, React */

var loop = loop || {};
loop.panel = (function(_, mozL10n) {
  "use strict";

  var sharedViews = loop.shared.views,
      // aliasing translation function as __ for concision
      __ = mozL10n.get;

  /**
   * Panel router.
   * @type {loop.desktopRouter.DesktopRouter}
   */
  var router;

  /**
   * Availability drop down menu subview.
   */
  var AvailabilityDropdown = React.createClass({
    getInitialState: function() {
      return {
        doNotDisturb: navigator.mozLoop.doNotDisturb,
        showMenu: false
      };
    },

    showDropdownMenu: function() {
      this.setState({showMenu: true});
    },

    hideDropdownMenu: function() {
      this.setState({showMenu: false});
    },

    // XXX target event can either be the li, the span or the i tag
    // this makes it easier to figure out the target by making a
    // closure with the desired status already passed in.
    changeAvailability: function(newAvailabilty) {
      return function(event) {
        // Note: side effect!
        switch (newAvailabilty) {
          case 'available':
            this.setState({doNotDisturb: false});
            navigator.mozLoop.doNotDisturb = false;
            break;
          case 'do-not-disturb':
            this.setState({doNotDisturb: true});
            navigator.mozLoop.doNotDisturb = true;
            break;
        }
        this.hideDropdownMenu();
      }.bind(this);
    },

    render: function() {
      // XXX https://github.com/facebook/react/issues/310 for === htmlFor
      var cx = React.addons.classSet;
      var availabilityStatus = cx({
        'status': true,
        'status-dnd': this.state.doNotDisturb,
        'status-available': !this.state.doNotDisturb
      });
      var availabilityDropdown = cx({
        'dnd-menu': true,
        'hide': !this.state.showMenu
      });
      var availabilityText = this.state.doNotDisturb ?
                              __("display_name_dnd_status") :
                              __("display_name_available_status");

      return (
        <div className="footer component-spacer">
          <div className="do-not-disturb">
            <p className="dnd-status" onClick={this.showDropdownMenu}>
              <span>{availabilityText}</span>
              <i className={availabilityStatus}></i>
            </p>
            <ul className={availabilityDropdown}
                onMouseLeave={this.hideDropdownMenu}>
              <li onClick={this.changeAvailability("available")}
                  className="dnd-menu-item dnd-make-available">
                <i className="status status-available"></i>
                <span>{__("display_name_available_status")}</span>
              </li>
              <li onClick={this.changeAvailability("do-not-disturb")}
                  className="dnd-menu-item dnd-make-unavailable">
                <i className="status status-dnd"></i>
                <span>{__("display_name_dnd_status")}</span>
              </li>
            </ul>
          </div>
        </div>
      );
    }
  });

  var ToSView = React.createClass({
    getInitialState: function() {
      return {seenToS: navigator.mozLoop.getLoopCharPref('seenToS')};
    },

    render: function() {
      var tosHTML = __("legal_text_and_links", {
        "terms_of_use_url": "https://accounts.firefox.com/legal/terms",
        "privacy_notice_url": "www.mozilla.org/privacy/"
      });

      if (this.state.seenToS == "unseen") {
        navigator.mozLoop.setLoopCharPref('seenToS', 'seen');
        return <p className="terms-service"
                  dangerouslySetInnerHTML={{__html: tosHTML}}></p>;
      } else {
        return <div />;
      }
    }
  });

  var PanelLayout = React.createClass({
    propTypes: {
      summary: React.PropTypes.string.isRequired
    },

    render: function() {
      return (
        <div className="component-spacer share generate-url">
          <div className="description">
            <p className="description-content">{this.props.summary}</p>
          </div>
          <div className="action">
            {this.props.children}
          </div>
        </div>
      );
    }
  });

  var CallUrlResult = React.createClass({

    getInitialState: function() {
      return {
        pending: false,
        callUrl: ''
      };
    },

    /**
    * Returns a random 5 character string used to identify
    * the conversation.
    * XXX this will go away once the backend changes
    */
    conversationIdentifier: function() {
      return Math.random().toString(36).substring(5);
    },

    componentDidMount: function() {
      this.setState({pending: true});
      this.props.client.requestCallUrl(this.conversationIdentifier(),
                                       this._onCallUrlReceived);
    },

    _onCallUrlReceived: function(err, callUrlData) {
      // XXX this initializer is a bug, as it will cause
      // setState to set the callUrl to false if one is not returned.
      // Should decide on an implement correct behavior and state
      // (eg set widget as disabled, state.callUrl == '')
      //
      var callUrl = false;

      this.props.notifier.clear();

      if (err) {
        this.props.notifier.errorL10n("unable_retrieve_url");
      } else {
        callUrl = callUrlData.callUrl || callUrlData.call_url;
      }

      this.setState({pending: false, callUrl: callUrl});
    },

    render: function() {
      // XXX setting elem value from a state (in the callUrl input)
      // makes it immutable ie read only but that is fine in our case.
      // readOnly attr will suppress a warning regarding this issue
      // from the react lib.
      var cx = React.addons.classSet;
      return (
        <PanelLayout summary={__("share_link_header_text")}>
          <div className="invite">
            <input type="url" value={this.state.callUrl} readOnly="true"
                   className={cx({'pending': this.state.pending})} />
          </div>
        </PanelLayout>
      );
    }
  });

  /**
   * Panel view.
   */
  var PanelView = React.createClass({
    propTypes: {
      notifier: React.PropTypes.object.isRequired,
      client: React.PropTypes.object.isRequired
    },

    render: function() {
      return (
        <div>
          <CallUrlResult client={this.props.client}
                       notifier={this.props.notifier} />
          <ToSView />
          <AvailabilityDropdown />
        </div>
      );
    }
  });

  var PanelRouter = loop.desktopRouter.DesktopRouter.extend({
    /**
     * DOM document object.
     * @type {HTMLDocument}
     */
    document: undefined,

    routes: {
      "": "home"
    },

    initialize: function(options) {
      options = options || {};
      if (!options.document) {
        throw new Error("missing required document");
      }
      this.document = options.document;

      this._registerVisibilityChangeEvent();

      this.on("panel:open panel:closed", this.clearNotifications, this);
      this.on("panel:open", this.reset, this);
    },

    /**
     * Register the DOM visibility API event for the whole document, and trigger
     * appropriate events accordingly:
     *
     * - `panel:opened` when the panel is open
     * - `panel:closed` when the panel is closed
     *
     * @link  http://www.w3.org/TR/page-visibility/
     */
    _registerVisibilityChangeEvent: function() {
      // XXX pass in the visibility status to detect when to generate a new
      // panel view
      this.document.addEventListener("visibilitychange", function(event) {
        this.trigger(event.currentTarget.hidden ? "panel:closed"
                                                : "panel:open");
      }.bind(this));
    },

    /**
     * Default entry point.
     */
    home: function() {
      this.reset();
    },

    clearNotifications: function() {
      this._notifier.clear();
    },

    /**
     * Resets this router to its initial state.
     */
    reset: function() {
      this._notifier.clear();
      var client = new loop.Client({
        baseServerUrl: navigator.mozLoop.serverUrl
      });
      this.loadReactComponent(<PanelView client={client}
                                         notifier={this._notifier} />);
    }
  });

  /**
   * Panel initialisation.
   */
  function init() {
    // Do the initial L10n setup, we do this before anything
    // else to ensure the L10n environment is setup correctly.
    mozL10n.initialize(navigator.mozLoop);

    router = new PanelRouter({
      document: document,
      notifier: new sharedViews.NotificationListView({el: "#messages"})
    });
    Backbone.history.start();

    // Notify the window that we've finished initalization and initial layout
    var evtObject = document.createEvent('Event');
    evtObject.initEvent('loopPanelInitialized', true, false);
    window.dispatchEvent(evtObject);
  }

  return {
    init: init,
    AvailabilityDropdown: AvailabilityDropdown,
    CallUrlResult: CallUrlResult,
    PanelView: PanelView,
    PanelRouter: PanelRouter,
    ToSView: ToSView
  };
})(_, document.mozL10n);