var app_version = navigator.appVersion.toLowerCase ();
var user_agent = navigator.userAgent.toLowerCase ();
var detected_os = "unknown";

function detect_os (ua_fragment, output_os) 
{
    var fingerprint = ua_fragment.toLowerCase ();
    if (app_version.indexOf (fingerprint) >= 0 || user_agent.indexOf (fingerprint) >= 0) {
        detected_os = output_os;
    }
}

detect_os ("Win", "unsupported");
detect_os ("Mac", "unsupported");
detect_os ("openSUSE", "openSUSE");
detect_os ("SUSE", "openSUSE");
detect_os ("SLED", "unsupported");
detect_os ("Ubuntu", "Ubuntu");
detect_os ("Debian", "unsupported");
detect_os ("Fedora", "Fedora");
detect_os ("RedHat", "Fedora");
detect_os ("Foresight", "unsupported");
detect_os ("ArchLinux", "ArchLinux");
detect_os ("Gentoo", "Gentoo");
detect_os ("FreeBSD", "FreeBSD");

var default_distro = detected_os.toLowerCase ();
var href_parts = document.location.href.split ('#');
if (href_parts.length > 1) {
    var override_distro = href_parts[href_parts.length - 1].toLowerCase ();
    if (override_distro.length > 1) {
        default_distro = override_distro;
    }
}

var download_action = "Install on";

function show_distro_details (button)
{
    var title = $$('#' + button.id + ' h4')[0].innerHTML;
    var content = $$('#' + button.id + ' div.details')[0].innerHTML;
    
    button.addClassName ('chosen');
    $$('#distros div.button').each (function (element, index) {
        if (element != button) {
            element.removeClassName ('chosen');
        }
    });
    
    $('distro-details').innerHTML = content;
    $('distro-details-header').innerHTML = download_action + ' ' + title;
}

function install_distro_button_actions ()
{
    $$('#distros div.button').each (function (button, index) {
        if (button.id == 'distro-' + default_distro) {
            show_distro_details (button);
        }
        
        button.observe ('click', function () { show_distro_details (button); } );
    });
    
    $('distro-details').setStyle ("display: block");
}

Event.observe (window, 'load', install_distro_button_actions);