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 // -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-

 /* 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";

 this.EXPORTED_SYMBOLS = ["RokuApp"];

 const { classes: Cc, interfaces: Ci, utils: Cu } = Components;

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

 function log(msg) {

   //Services.console.logStringMessage(msg);

 }

 const PROTOCOL_VERSION = 1;

 /* RokuApp is a wrapper for interacting with a Roku channel.

  * The basic interactions all use a REST API.

  * spec: http://sdkdocs.roku.com/display/sdkdoc/External+Control+Guide

  */

 function RokuApp(service, app) {

   this.service = service;

   this.resourceURL = this.service.location;

   this.app = app;

   this.appID = -1;

 }

 RokuApp.prototype = {

   status: function status(callback) {

     // We have no way to know if the app is running, so just return "unknown"

     // but we use this call to fetch the appID for the given app name

     let url = this.resourceURL + "query/apps";

     let xhr = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);

     xhr.open("GET", url, true);

     xhr.channel.loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;

     xhr.overrideMimeType("text/xml");

     xhr.addEventListener("load", (function() {

       if (xhr.status == 200) {

         let doc = xhr.responseXML;

         let apps = doc.querySelectorAll("app");

         for (let app of apps) {

           if (app.textContent == this.app) {

             this.appID = app.id;

           }

         }

       }

       // Since ECP has no way of telling us if an app is running, we always return "unknown"

       if (callback) {

         callback({ state: "unknown" });

       }

     }).bind(this), false);

     xhr.addEventListener("error", (function() {

       if (callback) {

         callback({ state: "unknown" });

       }

     }).bind(this), false);

     xhr.send(null);

   },

   start: function start(callback) {

     // We need to make sure we have cached the appID

     if (this.appID == -1) {

       this.status(function() {

         // If we found the appID, use it to make a new start call

         if (this.appID != -1) {

           this.start(callback);

         } else {

           // We failed to start the app, so let the caller know

           callback(false);

         }

       }.bind(this));

       return;

     }

     // Start a given app with any extra query data. Each app uses it's own data scheme.

     // NOTE: Roku will also pass "source=external-control" as a param

     let url = this.resourceURL + "launch/" + this.appID + "?version=" + parseInt(PROTOCOL_VERSION);

     let xhr = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);

     xhr.open("POST", url, true);

     xhr.overrideMimeType("text/plain");

     xhr.addEventListener("load", (function() {

       if (callback) {

         callback(xhr.status === 200);

       }

     }).bind(this), false);

     xhr.addEventListener("error", (function() {

       if (callback) {

         callback(false);

       }

     }).bind(this), false);

     xhr.send(null);

   },

   stop: function stop(callback) {

     // Roku doesn't seem to support stopping an app, so let's just go back to

     // the Home screen

     let url = this.resourceURL + "keypress/Home";

     let xhr = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);

     xhr.open("POST", url, true);

     xhr.overrideMimeType("text/plain");

     xhr.addEventListener("load", (function() {

       if (callback) {

         callback(xhr.status === 200);

       }

     }).bind(this), false);

     xhr.addEventListener("error", (function() {

       if (callback) {

         callback(false);

       }

     }).bind(this), false);

     xhr.send(null);

   },

   remoteMedia: function remoteMedia(callback, listener) {

     if (this.appID != -1) {

       if (callback) {

         callback(new RemoteMedia(this.resourceURL, listener));

       }

     } else {

       if (callback) {

         callback();

       }

     }

   }

 }

 /* RemoteMedia provides a wrapper for using TCP socket to control Roku apps.

  * The server implementation must be built into the Roku receiver app.

  */

 function RemoteMedia(url, listener) {

   this._url = url;

   this._listener = listener;

   this._status = "uninitialized";

   let serverURI = Services.io.newURI(this._url , null, null);

   this._socket = Cc["@mozilla.org/network/socket-transport-service;1"].getService(Ci.nsISocketTransportService).createTransport(null, 0, serverURI.host, 9191, null);

   this._outputStream = this._socket.openOutputStream(0, 0, 0);

   this._scriptableStream = Cc["@mozilla.org/scriptableinputstream;1"].createInstance(Ci.nsIScriptableInputStream);

   this._inputStream = this._socket.openInputStream(0, 0, 0);

   this._pump = Cc["@mozilla.org/network/input-stream-pump;1"].createInstance(Ci.nsIInputStreamPump);

   this._pump.init(this._inputStream, -1, -1, 0, 0, true);

   this._pump.asyncRead(this, null);

 }

 RemoteMedia.prototype = {

   onStartRequest: function(request, context) {

   },

   onDataAvailable: function(request, context, stream, offset, count) {

     this._scriptableStream.init(stream);

     let data = this._scriptableStream.read(count);

     if (!data) {

       return;

     }

     let msg = JSON.parse(data);

     if (this._status === msg._s) {

       return;

     }

     this._status = msg._s;

     if (this._listener) {

       // Check to see if we are getting the initial "connected" message

       if (this._status == "connected" && "onRemoteMediaStart" in this._listener) {

         this._listener.onRemoteMediaStart(this);

       }

       if ("onRemoteMediaStatus" in this._listener) {

         this._listener.onRemoteMediaStatus(this);

       }

     }

   },

   onStopRequest: function(request, context, result) {

     if (this._listener && "onRemoteMediaStop" in this._listener)

       this._listener.onRemoteMediaStop(this);

   },

   _sendMsg: function _sendMsg(data) {

     if (!data)

       return;

     // Add the protocol version

     data["_v"] = PROTOCOL_VERSION;

     let raw = JSON.stringify(data);

     this._outputStream.write(raw, raw.length);

   },

   shutdown: function shutdown() {

     this._outputStream.close();

     this._inputStream.close();

   },

   get active() {

     return (this._socket && this._socket.isAlive());

   },

   play: function play() {

     // TODO: add position support

     this._sendMsg({ type: "PLAY" });

   },

   pause: function pause() {

     this._sendMsg({ type: "STOP" });

   },

   load: function load(aData) {

     this._sendMsg({ type: "LOAD", title: aData.title, source: aData.source, poster: aData.poster });

   },

   get status() {

     return this._status;

   }

 }