/* (1) Initialise
---------------------------------------------------------*/
/* (1) Default data structure */
gs.set('login', {
	// fields
	username: {
		model:    '',
		timeout:  '',
		error:    '',
		validate: (_username) => /^[a-z0-9_-]{3,20}$/i.test(_username)
	},

	password: {
		model:    '',
		timeout:  '',
		error:    '',
		validate: (_password) => /^[^<>\/\\]{8,50}$/.test(_password)
	},

	// functions
	func: {
		print_err(_field, _message, _duration){},
		login(){},
		forgot_pass(){},
		press_enter(){}
	}

});




/* (2) Manage error messages
*
* @_field<String>					Field to print errors to
* @_message<String>					Error message to print
* @_duration<int>					Durations (sec) for the message to be displayed
*
---------------------------------------------------------*/
gs.get.login.func.print_err = function(_field, _message='error', _duration=null){

	/* (1) Fail: invalid _field */
	if( typeof _field !== 'string' || this[_field] == null )
		return false;

	/* (2) Fail: invalid _message */
	if( typeof _message !== 'string' )
		return false;

	/* (3) Fail: invalid _message */
	if( isNaN(_duration)  )
		return false;

	/* (4) Clear timeout if exists */
	!isNaN(this[_field].err_to) && clearTimeout(this[_field].err_to);

	/* (5) Display error */
	this[_field].error = _message;

	/* (6) No timeout if _duration if null */
	if( _duration === null )
		return true;

	/* (7) Setup Timeout */
	this[_field].err_to = setTimeout( function(){
		this.error = '';
	}.bind(this[_field]), _duration*1000);

	return true;

}.bind(gs.get.login);








/* (3) Login attempt
*
---------------------------------------------------------*/
gs.get.login.func.login = function(){

	/* (1) Cache fields' values */
	let username = this.username.model;
	let password = this.password.model;

	/* (2) Manage errors */
	let errors = false;

		// username error
		if( !this.username.validate(username) ){
			errors = true;
			this.func.print_err('username', '3 characters are required: letters, numbers, dot');
		}else
			this.func.print_err('username', '', 0);


		// password error
		if( !this.password.validate(password) ){
			errors = true;
			this.func.print_err('password', '8 characters are required');
		}else
			this.func.print_err('password', '', 0);

		// if errors -> fail
		if( errors )
			return false;

	/* (3) API bindings */
	api.call('GET /user/token', {}, function(rs){

		// manage error
		if( rs.error !== 0 || rs.token == null ){
			this.func.print_err('username', 'Invalid combination');
			this.func.print_err('password', 'Invalid combination');
			return;
		}

		// store TOKEN + user data
		auth.token = rs.token;
		auth.user = {
			uid:      null,        // todo
			username: username
		};
		document.location = '';

	}.bind(this), encodeURI(`${username}:${password}`));

}.bind(gs.get.login);








/* (4) Manage pressing on enter
*
---------------------------------------------------------*/
gs.get.login.func.press_enter = function(e){

	// if enter -> launch login
	if( e.keyCode === 13 )
		this.func.login();

}.bind(gs.get.login);