// Every 2.5 seconds check to see the login status of the current user. If it changes to external, logout
var login_status = {};

var loginStatusChecker = function() {
	this.usertype = false;
	this.userid = false;
	this.ttl = false;
	this.timeout = false;
	
	this.initializeDialog = function() {
		var t = this;
		
		var attemptLogin = function() {
			var u = $('#login_check_username').val();
			var p = $('#login_check_password').val();
			
			t.login(u, p);
		};
		
		$('#dlg_login_check').find('input').keypress(function(e) {
			if(e.keyCode == 13) {
				attemptLogin();
			}
		});
		
		$('#dlg_login_check').dialog({
			'autoOpen': false,
			'width': 480,
			'height': 260,
			'modal': true,
			'open': function() {
				$(this).find('input').val('');
			},
			'beforeclose': function(ev, ui) {
				if(t.usertype == 'external') {
					window.location.href = 'index.php';
					return false;
				}
				else {
					return true;
				}
			},
			'buttons': {
				'Cancel': function() {
					$(this).dialog('close');
				},
				'Submit': attemptLogin
			}
		});
	};
	
	this.login = function(username, password) {
			/* Attempt a login
					1. Failed: show error message and allow another attempt to login
					2. Success: 
							Check if returned userid and usertype are same as previous
							1. Yes: Populate new ttl, initiate new timeout, allow user to stay on page
							2. No: Redirect to welcome page
			*/
			var t = this;
			
			$.ajax({
					'type': 'post',
					'dataType': 'json',
					'data': {'username': username, 'password': password},
					'url': 'index.php?page=core.login_status',
					'success': function(o) {
						if(o.usertype == 'external') {
							// Login Failure
							app.msg('Please check your username and password', 'Login Failure');
						}
						else {
							// Login Success
							if(t.isSameUser(o.user, o.usertype)) {
								t.ttl = (o.ttl + 1) * 1000;
								t.timeout = setTimeout(t.check, t.ttl);
								$('#dlg_login_check').dialog('close');
							}
							else {
								window.location.href = 'index.php?page=welcome';	
							}
						}
					}
				});
		};
	
	this.isSameUser = function(id, type) {
		return (this.userid == id && this.usertype == type);
	};
	
	this.check = function() {
		var t = this;
		
		if(this.userid === false) {
			this.initializeDialog();
		}
		
		$.ajax({
			'type': 'get',
			'dataType': 'json',
			'url': 'index.php?page=core.login_status',
			'success': function(o) {
				// If no login info is present, assign new info and set delay
				if(t.userid === false && o.usertype == 'external') {
					// Do nothing, no need to check login status	
				}
				else if(o.usertype == 'external') {
					// User has been logged out due to expiry, give them the chance to log back in again
					$('#dlg_login_check').dialog('open');
				}
				else {
					// User is logged in
					if(t.userid === false) {
						// Initial attempt, setup userID
						t.userid = o.user;
						t.usertype = o.usertype;
					}
					else if(!t.isSameUser(o.user, o.usertype)) {
						// A different username or type was observer - redirect to welcome page
						window.location.href = 'index.php?page=welcome';	
					}

					t.ttl = (o.ttl + 1) * 1000;
					t.timeout = setTimeout(t.check, t.ttl);
				}
			}
		});
	};
};

$(function() {
	login_status = new loginStatusChecker();
	login_status.check();
});