/**
 * Installation javascript for Gallery
 *
 * $Id$
 */

function display_error(parentElt, text)
{
    var div = document.createElement('div');
    div.setAttribute('id', 'step2');
    div.style.display = 'none';
    div.style.position = 'relative';
    div.innerHTML = '\
        <i>'+text+'</i>\
        ';
    parentElt.appendChild(div);
        
    Effect.Appear('div')
}


function open_http_request()
{
    var http_request = false;
    
    if ( window.XMLHttpRequest ) 
    { 
        // Mozilla, Safari, ...
        http_request = new XMLHttpRequest();
        if ( http_request.overrideMimeType)
            http_request.overrideMimeType('text/xml');
    }
    else if ( windows.ActiveXObject )
    {
        // IE
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch ( e ) {
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch ( e ) {}
        }
    }

    return http_request;
}

function begin_download()
{
    var pane = document.getElementById('pane');
    Effect.SlideUp('step1');
    
    var step2 = document.createElement('div');
    step2.setAttribute('id', 'step2');
    step2.style.display = 'none';
    step2.style.position = 'relative';
    step2.innerHTML = '\
        <p style="text-align: center;">\
        <img src="/images/stock/spinner.gif">\
        <br />\
        SiteComponents is downloading Gallery. Please wait.</p>\
        <div name="status" style="font-size: 9px; font-style: italic;"></div>\
        ';
    pane.appendChild(step2);
        
    Effect.Appear('step2')
    
    var http_request = open_http_request();
    
    if ( !http_request )
    {
        display_error("Could not initiate download request.  Please <a href='?setup=manual'>install manually</a>.");
        return;
    }
    
    var statusTimer;
    
    http_request.onreadystatechange = function()
        {
            try {
                if ( http_request.readyState == 4 )
                {
                    if ( http_request.status == 200 )
                    {
                        var xmldoc = http_request.responseXML;
                        var resultCode = xmldoc.getElementsByTagName('resultcode').item(0).firstChild.data;
                        var resultString = xmldoc.getElementsByTagName('resultstring').item(0).firstChild.data;
                        
                        if ( resultCode == 0 )
                        {
                            // Success
                            clearTimeout(statusTimer);
                            begin_extraction();
                            return;
                        }
                        else
                        {
                            clearTimeout(statusTimer);
                            display_error(resultString);
                            return;
                        }
                    }
                    else
                    {
                        display_error("There was a problem initiating the download request.  Please <a href='?setup=manual'>install manually</a>.");
                        return;
                    }
                }
            } catch ( e ) {
                display_error("There was a problem initiating the download request.  Please <a href='?setup=manual'>install manually</a>.");
            }
        };
        
    http_request.open('GET', "?setup&command=download", true);
    http_request.send(null);
    
    statusTimer = setTimeout(update_download_status, 1000, document.getElementById('status'));
}


function update_download_status(elt)
{
    var http_request = open_http_request();
    
    if ( !http_request )
    {
        setTimeout(update_download_status, 1000, elt);
        return;
    }
    
    http_request.onreadystatechange = function()
        {
            try {
                if ( http_request.readyState == 4 )
                {
                    if ( http_request.status == 200 )
                    {
                        var xmldoc = http_request.responseXML;
                        var resultCode = xmldoc.getElementsByTagName('resultcode').item(0).firstChild.data;
                        var resultString = xmldoc.getElementsByTagName('resultstring').item(0).firstChild.data;
                        
                        if ( resultCode == 0 )
                        {
                            // Success
                            elt.innerHTML = (resultString / 1000) + " kB";
                        }
                    }
                }
            } catch ( e ) { }
            
            setTimeout(update_download_status, 1000, elt);
            return;
        };
        
    http_request.open('GET', "?setup&command=get_download_status", true);
    http_request.send(null);
}


function begin_extraction()
{
    var pane = document.getElementById('pane');
    Effect.SlideUp('step2');
    
    var step3 = document.createElement('div');
    step3.setAttribute('id', 'step3');
    step3.style.display = 'none';
    step3.style.position = 'relative';
    step3.innerHTML = '\
        <p style="text-align: center;">\
        <img src="/images/stock/spinner.gif">\
        <br />\
        Please wait while SiteComponents extracts the Gallery package.</p>\
        ';
    pane.appendChild(step3);
        
    Effect.Appear('step3')
    
    var http_request = open_http_request();
    
    if ( !http_request )
    {
        display_error("Could not initiate extraction request.  Please <a href='?setup=manual'>install manually</a>.");
        return;
    }
    
    http_request.onreadystatechange = function()
        {
            try {
                if ( http_request.readyState == 4 )
                {
                    if ( http_request.status == 200 )
                    {
                        var xmldoc = http_request.responseXML;
                        var resultCode = xmldoc.getElementsByTagName('resultcode').item(0).firstChild.data;
                        var resultString = xmldoc.getElementsByTagName('resultstring').item(0).firstChild.data;
                        
                        if ( resultCode == 0 )
                        {
                            // Success
                            show_installation();
                            return;
                        }
                        else
                        {
                             display_error(resultString);
                             return;
                        }
                    }
                    else
                    {
                        display_error("There was a problem initiating the extraction request.  Please <a href='?setup=manual'>install manually</a>.");
                        return;
                    }
                }
            } catch ( e ) {
                display_error("There was a problem initiating the extraction request.  Please <a href='?setup=manual'>install manually</a>.");
            }
        };
        
    http_request.open('GET', "?setup&command=extract", true);
    http_request.send(null);
}


function show_installation()
{
    var pane = document.getElementById('pane');
    Effect.SlideUp('step3');
    
    var step4 = document.createElement('div');
    step4.setAttribute('id', 'step4');
    step4.style.display = 'none';
    step4.style.position = 'relative';
    step4.innerHTML = '\
        Initial installation complete.<p>\
        Please visit the <a href="gallery2/">Gallery setup page</a> to proceed.\
        ';
    pane.appendChild(step4);
        
    Effect.Appear('step4')
    
}