/** 
 * Project   : AMDA-NG
 * Name      : SampModule.js
 * @class    amdaDesktop.SampModule
 * @extends  amdaDesktop.SampModule
 * @brief    Samp Module controller definition 
 * @author   Benjamin RENARD
 * $Id: SampModule.js 1698 2013-07-17 10:54:37Z benjamin $
 *****************************************************************************
 *    FT Id     :   Date   : Name - Description
 *******************************************************************************
 *  			 23/04/2012: BRE  - file creation
 */

Ext.define('amdaDesktop.SampModule', {
	
	extend: 'Ext.util.Observable',

	connector : null,
	ready     : false,
	
	constructor: function() 
	{
		this.addEvents({
			"connected"        : true,
			"disconnected"     : true,
			"clientregister"   : true,
			"clientunregister" : true,
			"clientmetachange" : true,
			"clientsubs"       : true,
			"uploadfile"       : true
		});
		
		this.callParent(arguments);
	},
	
	destroy: function()
	{
		if (this.isConnected())
			this.disconnect();
	},

	loadScript : function(successfn)
	{
		var me = this;
		
		if (this.ready)
		{
			successfn.call(me);
			return;
		}
			
		var connectorURL = Ext.Loader.getPath('samp')+"/jsamp/samp.js";
		var onLoadConnector = function () {
				
			var href = window.location.href;
	    	var baseurl = href.replace('desktop.php','');
	    	var iconURL = baseurl+'js/resources/images/amda_samp.jpg';
			
			var meta = {
				    "samp.name": "AMDA",
				    "samp.description.text":
				    "AMDA (Automated Multi Dataset Analysis) : Versatile web tool for space physics",
				    "samp.icon.url": iconURL
				};
				
			
			var cc = new samp.ClientTracker();
			
			var callHandler = cc.callHandler;
			
			callHandler["samp.app.ping"] = function(senderId, message, isCall) {
			    if (isCall) {
			        return {text: "ping to you, " + cc.getName(senderId)};
			    }
			};
			
			callHandler["table.load.votable"] = function(senderId, message, isCall) {
				var clientName = cc.getName(senderId);
				var url = message["samp.params"]["url"];
				me.receiveFile(clientName, url, "votable");
			};
			
			callHandler["table.load.cdf"] = function(senderId, message, isCall) {
				var clientName = cc.getName(senderId);
				var url = message["samp.params"]["url"];
				me.receiveFile(clientName, url, "cdf");
			};
			
			callHandler["table.load.netcdf"] = function(senderId, message, isCall) {
				var clientName = cc.getName(senderId);
				var url = message["samp.params"]["url"];
				me.receiveFile(clientName, url, "netcdf");
			};
			
			callHandler["samp.hub.event.shutdown"] = function(senderId, message, isCall) 
			{
				me.disconnect();
			};
			
			cc.onchange = function(id, type, data) 
			{
				switch (type)
				{
					case 'register' :
						me.fireEvent('clientregister',me,id);
						break;
					case 'unregister' :
						me.fireEvent('clientunregister',me,id);
						break;
					case 'meta' :
						me.fireEvent('clientmetachange',me,id,data,cc.subs[id]);
						break;
					case 'subs' :
						me.fireEvent('clientsubs',me,id,data);
						break;
				}
			};
			
			logCc = {
			    receiveNotification: function(senderId, message) {
					var handled = cc.receiveNotification(senderId, message);
			        //console.log("notification: " + message["samp.mtype"] +
			        //            " from " + cc.getName(senderId));
			    },
			    receiveCall: function(senderId, msgId, message) {
			        var handled = cc.receiveCall(senderId, msgId, message);
			        //console.log("call: " + message["samp.mtype"] +
			        //            " from " + cc.getName(senderId));
			    },
			    receiveResponse: function(responderId, msgTag, response) {
			        var handled = cc.receiveResponse(responderId, msgTag, response);
			        //	("response: " + msgTag +
			        //            " from " + cc.getName(responderId));
			    },
			    init: function(connection) {
			        cc.init(connection);
			    }
			};
			
			
			var subs = cc.calculateSubscriptions();
			
			me.connector = new samp.Connector("AMDA", meta, logCc, subs);
				
			me.connector.onreg = function(conn) {
				me.fireEvent('connected',me,true);
			};
			
			me.connector.onunreg = function(conn) {
				me.fireEvent('disconnected',me,true);
			};
			
			me.connector.onregerror = function(message) {
				me.showStartHubMsg();
			};
				
			me.ready = true;
				
			successfn.call(me);
		};
		
		var onErrorConnector = function () {
			myDesktopApp.errorMsg("Cannot load jsamp script");
			me.fireEvent('connected',me,false);
		};
		Ext.Loader.injectScriptElement(connectorURL, onLoadConnector, onErrorConnector, me);
	},
	
	showStartHubMsg : function()
	{
		var msg = "Cannot connect to a SAMP hub.<br/>";
		msg += 'You can use Java WebStart to start a JSAMP hub by just clicking here: <a href="http://astrojs.github.io/sampjs/hub/webhub.jnlp">start hub</a><br/>';
		msg += 'Or use internal hub included in tools like <a href="http://www.star.bris.ac.uk/~mbt/topcat/topcat-full.jnlp">TOPCAT</a> or <a href="http://aladin.u-strasbg.fr/java/nph-aladin.pl?frame=get&id=aladin.jnlp">Aladin</a>';
		myDesktopApp.errorMsg(msg);
	},
	
	connect : function()
	{
		if (!this.connector || !this.ready)
			return false;
		try
		{
			this.connector.register();		
			return true;
		}
		catch(err)
		{
			myDesktopApp.errorMsg(err);
			return false;
		}
	},
	
	disconnect : function()
	{
		if (!this.connector || !this.ready)
			return false;
		try
		{
			this.connector.unregister();
			this.fireEvent('disconnected',this,true);
				
			return true;
		}
		catch(err)
		{
			myDesktopApp.errorMsg(err);
			return false;
		}
	},
	
	isConnected : function()
	{
		if (!this.connector || !this.ready)
			return false;
		try
		{
			return this.connector.connection;
		}
		catch(err)
		{
			myDesktopApp.errorMsg(err);
			return false;
		}
	},
	
	notififyMessage : function(message,clientId)
	{
		if (!this.connector || !this.ready)
			return false;
		try
		{
			if (!clientId || clientId == 'hub')
				this.connector.connection.notifyAll([message]);
			else
				this.connector.connection.notify([clientId,message]);
			return true;
		}
		catch(err)
		{
			myDesktopApp.errorMsg(err);
			return false;
		}
	},
	
	sendVOTable : function(url,clientId)
	{
		var message = new samp.Message('table.load.votable', {"url": url});
		return this.notififyMessage(message,clientId);
	},
	
	sendFITS : function(url,name)
	{
		var message = new samp.Message('image.load.fits', {"url": url, "name": name});
		return this.notififyMessage(message);
	},
	
	sendAladinScript : function(ascript)
	{
		var message = new samp.Message('script.aladin.send', {"script": ascript});
		return this.notififyMessage(message);
	},
	
	getSubscribedClients : function(mType)
	{
		if (!this.connector || !this.ready)
			return [];
		return this.connector.connection.getSubscribedClients([mType]);
	},
	
	isSubscribed : function(subs, mtype)
	{
		if (!this.connector || !this.ready)
			return [];
		return samp.isSubscribed(subs, mtype);
	},
	
	receiveFile : function(clientName, url, format)
	{
		this.fireEvent('uploadfile',this,clientName, url, format);
	},

	loadFile : function(url, onLoad, onError)
 	{
		if (!this.connector || !this.ready) {
			if (onError)
				onError("Not connected to a SAMP hub");
			return;
		}
		var proxifiedUrl = this.connector.connection.translateUrl(url);
		var xobj = null;
		if ((typeof XMLHttpRequest != "undefined") && (typeof FileReader != "undefined")) {
			xobj = new XMLHttpRequest();
		}
		else {
			if (onError)
				onError("Not supported by your browser");
			return;
		}
		xobj.open('GET', proxifiedUrl, true);
		xobj.responseType = "blob";
		xobj.onload = function() {
			var blob = xobj.response;
			var reader  = new FileReader();
			reader.addEventListener("load", function () {
				if (onLoad)
					onLoad(reader.result);
			}, false);
			reader.addEventListener("error", function () {
				if (onError)
					onError("Cannot load data received from SAMP");
			}, false);
			reader.readAsText(blob,"UTF-8");
		};
		xobj.onerror = function () {
			if (onError)
				onError("An error occurred during the SAMP request");
		};
		xobj.send(null);
		return true;
	},
});