var Conf = {
	 appName: 'Verdnatura'
	,dsName: 'verdnatura'
	,dsPath: 'HKCU\\Software\\ODBC\\ODBC.INI\\verdnatura'
	,regPath: 'HKCU\\Software\\Verdnatura\\vn-access'
	,remoteUrl: 'https://verdnatura.es/vn-access'
	,dbHost: 'db.verdnatura.es'
	,defaultModule: 'tpv'
	,defaultLocale: 'es'
};

var Locale = {
	es: {
		"Enter a user name":
			"Introduce un nombre de usuario"
		,"Enter a password":
			"Introduce una contraseña"
		,"Server can't be reached":
			"No se ha podido conectar con el servidor"
		,"Updating":
			"Actualizando"
		,"Bad login":
			"Usuario o contraseña incorrectos"
		,"Loading":
			"Cargando"
		,"Error while updating":
			"Error al actualizar"
		,"Microsoft Access 2003 is not installed":
			"Microsoft Access 2003 no está instalado en el sistema"
		,"MDB file not found":
			"No se encontro el fichero MDB"
   }
};

var App = {
	shell: new ActiveXObject('WScript.Shell'),
	fso: new ActiveXObject('scripting.filesystemobject'),
	
	init: function() {
		var width = 420;
		var height = 360;

		window.resizeTo(width, height);
		window.moveTo((screen.width - width) / 2, (screen.height - height) / 2);
	},
	
	_onLoad: function() {
		// Initializes the global variables
	
		var split = Verdnatura.commandLine.match(/(?:[^\s"]+|"[^"]*")+/g);
		
		if (split.length > 1)
			this.module = split[1].replace(/^"+|"+$/g, '');
		if (!this.module)
			this.module = Conf.defaultModule;

		this.appDir = this.getEnv('ProgramFiles') +'\\'+ Conf.appName;
		this.moduleDir = this.shell.SpecialFolders('AppData') +'\\'+ Conf.appName;
		this.remoteFile = Conf.remoteUrl +'/'+ this.module +'.7z';
		this.compressFile = this.getEnv('TEMP') +'\\'+ this.module +'.7z';
		this.mdbFile = this.moduleDir +'\\'+ this.module +'.mdb';

		// Creates the necessary registry entries
		
		var configured = this.regRead(Conf.regPath, 'configured');
		
		if (!configured) {
			var path;
			
			// Creates the Access configuration entries
			
			path = 'HKCU\\Software\\Microsoft\\Office\\11.0\\Access\\Settings';
			this.regWrites(path, 'REG_DWORD', {
				'Confirm Document Deletions' : 0,
				'Confirm Action Queries'     : 0,
				'Confirm Record Changes'     : 0
			});
			
			path = 'HKCU\\Software\\Microsoft\\Office\\11.0\\Access\\Security';
			this.regWrite(path, 'Level', 1, 'REG_DWORD');
			
			// Creates the MySQL ODBC connection
			
			var driverPath = this.getEnv('ProgramFiles')
				+'\\MySQL\\Connector ODBC 5.1\\myodbc5.dll';
			
			var params = {
				'Driver'         : driverPath,
				'DESCRIPTION'    : Conf.appName,
				'SERVER'         : Conf.dbHost,
				'DATABASE'       : 'vn2008',
				'SSLCA'          : this.appDir +'\\cacert.pem',
				'SSLVERIFY'      : 1,
				'AUTO_RECONNECT' : 1
			};

			this.createOdbc(
				Conf.dsName,
				'Mysql ODBC 5.1 Driver',
				params
			);
			
			// Marks the application as configured
			
			this.regWrite(Conf.regPath, 'configured', 1, 'REG_DWORD');
		}
		
		// Loads the form data
		
		var user = this.regRead(Conf.dsPath, 'UID');
		var password = this.regRead(Conf.dsPath, 'PWD');
		var remember = this.regRead(Conf.regPath, 'remember');

		if (user)
			this.$('user').value = user;

		if (remember && password) {
			this.$('password').value = password;
			this.$('remember').checked = true;
			this._onEnterClick();
		} else
			this.resetForm(true);
	},

	resetForm: function(clearPassword) {
		if (clearPassword)
			this.$('password').value = '';

		this.$('user').focus();
		this.$('user').select();
	},

	createOdbc: function(dsName, driverName, params) {
		var odbcPath = 'HKCU\\Software\\ODBC\\ODBC.INI\\';
		
		this.regWrites(odbcPath + dsName, 'REG_SZ', params);
		this.regWrite(odbcPath + 'ODBC Data Sources',
			dsName, driverName, 'REG_SZ');	
	},
	
	_disableUi: function(disabled, loadMessage) {
		if (disabled)
			this._hideMessage();
		else
			loadMessage = '';
		
		this.$('loading-message').innerHTML = loadMessage;
		
		this.$('user').disabled = disabled;
		this.$('password').disabled = disabled;
		this.$('remember').disabled = disabled;
		this.$('enter').disabled = disabled;
		
		var display = disabled ? 'block' : 'none';
		this.$('background').style.display = display;
		this.$('spinner').style.display = display;
	},
	
	_onKeyPress: function(e) {
		switch (e.keyCode) {
			case 13: // Enter
				this._onEnterPress(e);
				break;
			case 27: // Esc
				window.close();
				break;
		}
	},

	_onEnterPress: function(event) {
		var target = event.target || event.srcElement;

		if (target && target.id == 'user' && this.$('password').value == '') {
			this.$('password').focus();
			return;
		}

		this._onEnterClick();
	},
	
	_onEnterClick: function() {
		this._disableUi(true, _('Loading'));
		setTimeout(function() {App._login();}, 0);
	},

	_login: function() {
		var clearPassword;

		try {
			var user = this.$('user').value;
			var password = this.$('password').value;
	
			if (!user || user === '')
				throw new Error(_('Enter a user name'));
			if (!password || password === '')
				throw new Error(_('Enter a password'));
		
			this.regWrite(Conf.dsPath, 'UID', user, 'REG_SZ');
			this.regWrite(Conf.dsPath, 'PWD', password, 'REG_SZ');

			// Gets the last version number using the MySQL ODBC connection
			
			var mysqlConn = new ActiveXObject('ADODB.Connection');

			try {
				mysqlConn.open(Conf.dsName);
			} catch (e) {
				var dbErrors = mysqlConn.errors;

				if (dbErrors.count > 0) {
					var errorMsg;
					var dbError = dbErrors.item(0);

					switch (dbError.NativeError) {
						case 1045: // Access denied
							clearPassword = true;
							errorMsg = _('Bad login');
							break;
						case 2003: // Can't connect
							errorMsg = _('Server can\'t be reached');
							break;
						default:
							errorMsg = dbError.description;
					}

					dbErrors.clear();
					throw new Error(errorMsg);
				} else
					throw e;
			}
		
			var sql = 'SELECT version FROM versiones WHERE programa = \''+ this.module +'\'';
			var rs = mysqlConn.execute(sql);

			var lastVersion = rs.EOF ? 0 : parseInt(rs.fields(0).value);

			rs.close();
			mysqlConn.close();

			// Obtains the local version number from the MDB file

			var localVersion = -1;
			
			if (this.fso.fileExists(this.mdbFile))
			try {
				var mdbConn = new ActiveXObject('ADODB.Connection');
				mdbConn.open('Provider=Microsoft.Jet.OLEDB.4.0; Data Source='+ this.mdbFile +';');

				var oRs = new ActiveXObject('ADODB.Recordset');
				oRs.Open('SELECT Version FROM tblVariables', mdbConn);
				localVersion = oRs.EOF ? -1 : parseInt(oRs('Version'));
				
				oRs.close();
				mdbConn.close();
			} catch (e) {}
			
			// Compares the local version with the las version

			if (localVersion < lastVersion) {
				this._disableUi(true, _('Updating'));

				var queryString = lastVersion
					? 'v'+ lastVersion
					: new Date().getTime();

				var request = new ActiveXObject('MSXML2.XMLHTTP');
				request.open('GET', this.remoteFile +'?'+ queryString, true);
				request.onreadystatechange = function() {
					App._onRequestReady(request);
				};
				request.send();
			} else
				this.openMdb();
		} catch (e) {
			this._catchError(e, clearPassword);
		}
	},
	
	_onRequestReady: function(request)
	{
		if (request.readyState !== 4)
			return;
		
		try {
			if (request.status !== 200)
				throw new Error('HTTP: '+ request.statusText);

			if (this.fso.fileExists(this.compressFile))
				this.fso.deleteFile(this.compressFile);

			var stream = new ActiveXObject('ADODB.Stream');
			stream.open();
			stream.Type = 1; //adTypeBinary
			stream.write(request.responseBody);
			stream.Position = 0;
			stream.saveToFile(this.compressFile, 2);
			stream.close();
			
			if (this.fso.fileExists(this.mdbFile))
				this.fso.deleteFile(this.mdbFile);
		
			this.run('7za e "'+ this.compressFile +'" -o"'+ this.moduleDir +'"', true);
			this.fso.deleteFile(this.compressFile);
		} catch (e) {
			alert(_('Error while updating') +': '+ e.message);
		}

		try {
			if (!this.fso.fileExists(this.mdbFile))
				throw new Error(_('MDB file not found'));

			this.openMdb();
		} catch (e) {
			this._catchError(e);
		}
	},
	
	openMdb: function() {
		var remember = this.$('remember').checked ? 1 : 0;
		this.regWrite(Conf.regPath, 'remember', remember, 'REG_DWORD');

		var programFiles = this.getEnv('ProgramFiles');
		var accessBin = programFiles +'\\Microsoft Office\\OFFICE11\\MSACCESS.EXE';

		if (!this.fso.fileExists(accessBin))
			throw new Error(_('Microsoft Access 2003 is not installed'));

		this.shell.exec('"'+ accessBin +'" "'+ this.mdbFile +'"');
		window.close();
	},
	
	_catchError: function(error, clearPassword) {
		if (!this.$('remember').checked || clearPassword)
			this.regWrite(Conf.dsPath, 'PWD', '', 'REG_SZ');

		this._disableUi(false);
		this.showMessage(error.message);
		this.resetForm(clearPassword);
	},
	
	showMessage: function(message) {
		if (this.messageTimeout)
			clearTimeout(this.messageTimeout);

		var messageDiv = this.$('message');
		messageDiv.innerHTML = message;
		messageDiv.style.display = 'block';
		this.messageTimeout = setTimeout(function() {App._hideMessage();}, 10000);
	},
	
	_onBodyClick: function() {
		this._hideMessage();
	},
	
	_hideMessage: function() {
		if (this.messageTimeout) {
			this.$('message').style.display = 'none';
			clearTimeout(this.messageTimeout);
			this.messageTimeout = null;
		}
	},
	
	_onUnload: function() {
		this._disableUi(false);
	},
	
	$: function(id) {
		return document.getElementById(id);
	},

	run: function(command, wait) {
		if (!wait)
			wait = false;
	
		this.shell.run(command, 0, wait);
	},
	
	getEnv: function(varName) {
		return this.shell.expandEnvironmentStrings('%'+ varName +'%');
	},

	regRead: function(path, key) {
		try {
			var value = this.shell.regRead(path +'\\'+ key);
		} catch (e) {
			var value = null;
		}
		
		return value;
	},
	
	regWrite: function(path, key, value, type) {
		this.shell.regWrite(path +'\\'+ key, value, type);
	},

	regWrites: function(path, type, values) {
		for(var key in values)
			this.regWrite(path, key, values[key], type);		
	}
};

App.init();

function _(string) {
	var translation = Locale[Conf.defaultLocale][string];
	return translation ? translation : string;
}