/**
 * Javascript to do with the login screen
 * @author Tim Cooper & Daniel Dammann <dd@volnet.freeserve.co.uk>
 */

function logIntoDock() {
    $.ajax({
        type: 'POST',
        url: '/main/ajax/log_into_dock.php',
        data: 'u_name=' + document.getElementById('u_name').value + '&p_word=' + document.getElementById('p_word').value + '&school=' + document.getElementById('school').value,
        timeout: 20000,
        success: function(arg_user_id) {
            if ( arg_user_id == 0 ) {
                displayErrorMessage('Sorry, username or password not<br />recognised. Please try again.');
            } else {
                //alert('Logged in ok '+arg_user_id );
                login(arg_user_id);
            }
			
        },
        error: function(request, errorType, errorThrown) {
            // Output error
            alert('Unfortunately, your login details could not be checked. Please check your Internet connection and try logging into realsmart again. Should this keep happening even with a live Internet connection, please contact support@smartassess.com and quote: \n\n1. Error time: Fri, 03 Sep 10 00:31:36 +0000 \n2. Error type: ' + errorType + ' \n3. Error: ' + errorThrown + ' (should you see a yellow exclamation mark in the bottom left corner of your browser, please double-click it and also report us that error message) \n4. User id: 0 \n5. Web page: http://rlsmart.net/main/js/login_js.php');
        }
    });
}

function validateFormAndSubmit() {
    if (document.getElementById('u_name').value == '' && document.getElementById('p_word').value == '') {
        displayErrorMessage('You have missed filling in<br />your username &amp; password.');
    } else if (document.getElementById('u_name').value == '') {
        displayErrorMessage('You have missed filling in<br />your username.');
    } else if (document.getElementById('p_word').value == '') {
        displayErrorMessage('You have missed filling in<br />your password.');
    } else {
        displayLoginButton();
        logIntoDock();
    }
    return false;
}

function displayErrorMessage(argMsg) {
    document.getElementById('loginButtonAndErrorMessage').style.color = '#FFFFFF';
    document.getElementById('loginButtonAndErrorMessage').innerHTML = '<marquee><blink>' + argMsg + '</blink></marquee>';
    document.getElementById('openIdSentence').innerHTML = '';
}

function displayLoginButton() {
    document.getElementById('loginButtonAndErrorMessage').innerHTML = '<input type="button" value="Login" onclick="validateFormAndSubmit();" />';
    //document.getElementById('openIdSentence').innerHTML = '<a href="/main/index_open_id.php?id=0" style="color:#FFFFFF;">Log in using an open id instead &raquo;&raquo;</a>';
}

// grabs a reference to the flash movie
function thisMovie(movieName) {
    if (navigator.appName.indexOf("Microsoft") != -1) {
    	return window[movieName];
    } else {
    	return document[movieName];
    }
}

function writeErrorToPage(argWhatError) {
    document.write('<div align="center">');
    document.write('    <p>&nbsp;</p>');
    document.write('    <p>&nbsp;</p>');

    if (argWhatError == 'browser') {
        document.write('    <img src="/main/images/login/error_browser.png" alt="browser error" />');
    } else if (argWhatError == 'screen_resolution') {
        document.write('    <img src="/main/images/login/error_screen_resolution.png" alt="screen resolution error" />');
    } else if (argWhatError == 'cookies') {
        document.write('    <img src="/main/images/login/error_cookies.png" alt="cookies error" />');
    }

    document.write('</div>');
}

function writeFlashErrorToPage() {
    var flashMsg;
    flashMsg  = '<div align="center">';
    flashMsg += '   <p>&nbsp;</p>';
    flashMsg += '   <p>&nbsp;</p>';
    flashMsg += '   <a href="http://get.adobe.com/flashplayer/" target="_blank">';
    flashMsg += '       <img src="/main/images/login/error_flash.png" alt="flash error" />';
    flashMsg += '   </a>';
    flashMsg += '</div>';
    document.getElementById('divFlashContent').innerHTML = flashMsg;
}

function isUserHighTechEnough() {
    // Detect browser
    var br = new Array(4);
    br = getBrowser();
    var brVersion = parseInt(getMajorVersion(br[1]));
    var isBrowserGood;

    if (br[0] == 'firefox' && brVersion >= 3){
        isBrowserGood = true;
    } else if (br[0] == 'safari' && brVersion >= 530){
        // Build version 522 is Safari 3 and build version 530 is Safari 4
        // Build version 532 is Chrome 4.1
        isBrowserGood = true;
    } else if (br[0] == 'msie' && brVersion >= 6){
        isBrowserGood = true;
    } else {
        isBrowserGood = false;
    }

    // Detect cookies
    var tmpCookie = new Date();
    chkCookie = (tmpCookie.getTime() + '');
    document.cookie = "chkCookie=" + chkCookie;

    // Debugging
    //alert("<p>Browser '" + br[0] + "' version '" + getMajorVersion(br[1]) + "'</p>");

    // Let em through ?
    if (isBrowserGood == false){
        // Has browser ?
        writeErrorToPage('browser');
        return false;
    } else if (screen.width < 800 || screen.height < 480){
        // Has screen ?
        writeErrorToPage('screen_resolution');
        return false;
    } else if (document.cookie.indexOf(chkCookie, 0) < 0) {
        // Has cookies ?
        writeErrorToPage('cookies');
        return false;
    } else {
        return true;
    }
}

function login( userId ) {
    // begin the login process
    thisMovie('dock').login( userId );
    showFlash();
}
    
function showFlash() {
    // resize the flash content
    document.getElementById('htmlPage').style.display = 'none';
    document.getElementById('divFlashContent').style.width = '100%';
    document.getElementById('divFlashContent').style.height = '100%';
    return false;
}

function userLoggedOutFromFlash() {
    // hide the flash content
    document.getElementById('divFlashContent').style.width = '10px';
    document.getElementById('divFlashContent').style.height = '10px';
    document.getElementById('htmlPage').style.display = 'block';
    
    // make sure password removed from login form
    document.getElementById('u_name').value = '';
    document.getElementById('p_word').value = '';
    //document.getElementById('u_name').focus();
    document.getElementById('u_name').style.background = 'url(/main/images/login/username_background.gif) no-repeat';
    document.getElementById('p_word').style.background = 'url(/main/images/login/password_background.gif) no-repeat';
    
    //alert('logged out');
    return false;
}