window.addEventListener ('load',
	function () { Vn.Web.initialize (); });

Vn.Web = 
{
	 forms: {}
	,activeForm: null
	,activeFormPath: null
	,requestedForm: null
	,menuShown: false
	,menuOptions: {}
	,choosedOption: null

	,initialize: function ()
	{
		this.loadingCount = 0;
		this.loader = Vn.get ('loader');

		this.formHolder = Vn.get ('form');

		this.hash = new Vn.Hash ();
		this.hashLink = new Vn.HashLink
		({
			 hash: this.hash
			,key: 'form'
		});
		this.hashLink.on ('changed', this.onFormChange, this);

		this.conn = new Db.Conn ();
		this.conn.on ('error', this.onConnError, this);
		this.conn.on ('loading-changed', this.onConnLoading, this);
		this.conn.open (null, null, null, this.connOpened.bind (this));

		var menuButton = Vn.get ('menu-button');
		menuButton.addEventListener ('click', this.onMenuClick.bind (this));

		var menuBox = Vn.get ('menu-box');
		menuBox.addEventListener ('click', function (event)
		{
			event.stopPropagation ();
		});
	}

	,onMenuClick: function (event)
	{
		event.stopPropagation ();

		if (!this.menuShown)
			this.showMenu ();
		else
			this.hideMenu ();
	}

	,showMenu: function ()
	{
		var menu = Vn.get ('menu-box');
		menu.style.display = 'block';
		var menuBackground = Vn.get ('menu-background');
		menuBackground.style.display = 'block';
		this.menuShown = true;

		this.hideMenuCallback = this.hideMenu.bind (this);
		document.addEventListener ('click', this.hideMenuCallback);
	}

	,hideMenu: function ()
	{
		var menu = Vn.get ('menu-box');
		menu.style.display = 'none';
		var menuBackground = Vn.get ('menu-background');
		menuBackground.style.display = 'none';
		this.menuShown = false;
		
		document.removeEventListener ('click', this.hideMenuCallback);
		this.hideMenuCallback = null;
	}
	
	,connOpened: function (conn, success)
	{
		var sql = 'SELECT default_form, image_dir FROM config;'
			+'SELECT name FROM customer_view;'
			+'CALL form_list ();';
		this.conn.execQuery (sql, this.onMainQueryDone.bind (this));
	}

	,onMainQueryDone: function (resultSet)
	{
		// Retrieving configuration parameters

		var res = resultSet.fetchResult ();
		var columns = res.columns;
	
		if (res.next ())
		for (var i = 0; i < res.columns.length; i++)
			Vn.Config[columns[i].name] = res.get (columns[i].name);

		// Retrieving the user name

		var userName = resultSet.fetchValue ();

		if (userName)
		{
			var span = Vn.get ('user-name');
			span.appendChild (document.createTextNode (', '+ userName));
		}

		// Retrieving menu sections		

		var res = resultSet.fetchResult ();	
		var sectionMap = {};
		
		if (res)
		for (var i = 0; res.next (); i++)
		{
			var parent = res.get ('parent');
			
			if (!sectionMap[parent])
				sectionMap[parent] = [];
				
			sectionMap[parent].push (i);
		}

		this.createMenu (res, sectionMap, null, Vn.get ('menu'));

		// Loading the default form

		this.onFormChange ();
	}

	,onConnError: function (conn, error)
	{
		switch (error.domain)
		{
			case 'Auth':
				this.unload ();
				location.assign ('?page=login#!error='+ error.code);
				break;
			case 'Version':
				this.newVersion (error);
				break;
			case 'Conn':
				alert (error.message);
				break;
			default:
				console.warn (error.message);
		}
	}

	,onConnLoading: function (conn, isLoading)
	{
		if (isLoading)
			this.loaderPush ();
		else
			this.loaderPop ();
	}
	
	,loaderPush: function ()
	{
		this.loadingCount++;

		if (this.loadingCount == 1)
			this.loader.style.visibility = 'visible';
	}
	
	,loaderPop: function ()
	{
		if (this.loadingCount == 0)
			return;
		
		this.loadingCount--;
		
		if (this.loadingCount == 0)
			this.loader.style.visibility = 'hidden';
	}
	
	,newVersion: function (error)
	{
		if (this.skipVersion)
			return;

		this.skipVersion = true;

		var reload;
		var message = _('NewVersionAvailable') +"\n\n"+ error.message;

		if (error.code == 'criticalVersion')
		{
			alert (message)
			reload = true;
		}
		else
			reload = confirm (message);
		
		if (reload)
		{
			this.unload ();
			location.reload ();
		}
	}

	,createMenu: function (res, sectionMap, parent, ul)
	{
		var sections = sectionMap[parent];

		for (var i = 0; i < sections.length; i++)
		{
			res.row = sections[i];
		
			var li = document.createElement ('li');
			ul.appendChild (li);
			this.menuOptions[res.get ('path')] = li;

			var a = document.createElement ('a');
			a.href = this.hash.make ({'form': res.get ('path')});
			li.appendChild (a);

			var text = document.createTextNode (_(res.get ('description')));
			a.appendChild (text);
			
			var formId = res.get ('id');
			
			if (sectionMap[formId])
			{
				var submenu;
				
				if (!Vn.isMobile ())
				{
					submenu = document.createElement ('ul');
					submenu.className = 'submenu';
					li.appendChild (submenu);

					li.addEventListener ('mouseover',
						this.onLiMouseHover.bind (this, submenu, a));
					li.addEventListener ('mouseout',
						this.onLiMouseOut.bind (this));
				}
				else
					submenu = ul;

				this.createMenu (res, sectionMap, formId, submenu);
			}
		}
	}

	,onLiMouseHover: function (submenu, parent)
	{
		this.hideSubmenu ();
		this.activeSubmenu = submenu;

		var rect = parent.getBoundingClientRect ();
		submenu.style.display = 'inline';
		submenu.style.left = rect.right +'px';
		submenu.style.top = rect.top +'px';
	}
	
	,onLiMouseOut: function ()
	{
		this.timeout = setTimeout (this.hideSubmenu.bind (this), 160);
	}
	
	,hideSubmenu: function ()
	{
		var submenu = this.activeSubmenu;
	
		if (submenu)
		{
			submenu.style.display = 'none';
			clearTimeout (this.timeout);
			this.activeSubmenu = null;
			this.timeout = 0;
		}
	}
	
	,onFormChange: function ()
	{
		var formPath = this.hashLink.value;
		this.openForm (formPath ? formPath : Vn.Config['default_form']);
	}

	,openForm: function (formPath)
	{
		if (Vn.isMobile ())
			this.hideMenu ();

		this.requestedForm = formPath;
		this.loadForm (formPath, this.onFormLoad.bind (this));
	}
	
	,loadForm: function (formPath, callback)
	{
		var formInfo = this.forms[formPath];

		if (!formInfo)
		{
			var aux = formPath.split ('/');
			var formName = aux[aux.length - 1];

			var klass = 'Vn.'+ formName.charAt (0).toUpperCase ();
			klass += formName.substr (1).replace (/\w\-\w/g, function (token)
			{
				return token.charAt (0) + token.charAt (2).toUpperCase ();
			});

			formInfo = {
				 path: formPath
				,klass: klass
				,localeReady: false
				,jsReady: false
				,xml: null
				,ready: false
				,callbacks: []
			};

			var path = 'forms/'+ formPath;

			Vn.Locale.load (path,
				this.onFormLocaleReady.bind (this, formInfo));
			Vn.includeJs (path +'/'+ formName +'.js',
				this.onFormJsReady.bind (this, formInfo));
			Vn.includeCss (path +'/style.css');

			var request = new XMLHttpRequest ();
			request.onreadystatechange =
				this.onFormUiReady.bind (this, formInfo, request);
			request.open ('get', 'form.php?form='+ formPath, true);
			request.send ();

			this.forms[formPath] = formInfo;
			this.loaderPush ();
		}

		var newChoosedOption = this.menuOptions[formInfo.path];
		
		if (newChoosedOption)
		{
			if (this.choosedOption)
				this.choosedOption.className = null;
			
			newChoosedOption.className = 'selected';
			this.choosedOption = newChoosedOption;
		}

		if (callback)
		{
			if (formInfo.ready)
				callback (formInfo);
			else
				formInfo.callbacks.push (callback);
		}
	}

	,onFormLocaleReady: function (formInfo)
	{
		formInfo.localeReady = true;
		this.onFormDownload (formInfo);
	}

	,onFormJsReady: function (formInfo)
	{
		formInfo.jsReady = true;
		this.onFormDownload (formInfo);
	}
	
	,onFormUiReady: function (formInfo, request)
	{
		if (request.readyState != 4)
			return;
		if (request.status == 200)
			formInfo.xml = request;

		this.onFormDownload (formInfo);
	}

	,onFormDownload: function (formInfo)
	{
		if (!(formInfo.localeReady && formInfo.jsReady && formInfo.xml))
			return;

		formInfo.ready = true;

		var callbacks = formInfo.callbacks;
		delete formInfo.callbacks;

		for (var i = 0; i < callbacks.length; i++)	
			callbacks[i] (formInfo);

		this.loaderPop ();
	}		
	
	,onFormLoad: function (formInfo)
	{
		if (formInfo.path != this.requestedForm)
			return;		

		if (this.activeForm)
			this.activeForm.close ();

		this.activeFormPath = formInfo.path;

		try {
			var klass = eval (formInfo.klass);
			this.activeForm = new klass (this, formInfo);
			this.activeForm.activate ();
		}
		catch (e) {
			console.error (e);
		}
	}
	
	,unload: function ()
	{
		this.hashLink.disconnect ('changed', this.onFormChange, this);
		this.conn.disconnect ('error', this.onConnError, this);
		this.conn.disconnect ('loading-changed', this.onConnLoading, this);
	}
};