//
// MoinMoin commonly used JavaScript functions
//

// We keep here the state of the search box
searchIsDisabled = false;

function searchChange(e) {
    // Update search buttons status according to search box content.
    // Ignore empty or whitespace search term.
    var value = e.value.replace(/\s+/, '');
    if (value == '' || searchIsDisabled) { 
        searchSetDisabled(true);
    } else {
        searchSetDisabled(false);
    }
}

function searchSetDisabled(flag) {
    // Enable or disable search
    document.getElementById('fullsearch').disabled = flag;
    document.getElementById('titlesearch').disabled = flag;
}

function searchFocus(e) {
    // Update search input content on focus
    if (e.value == search_hint) {
        e.value = '';
        e.className = '';
        searchIsDisabled = false;
    }
}

function searchBlur(e) {
    // Update search input content on blur
    if (e.value == '') {
        e.value = search_hint;
        e.className = 'disabled';
        searchIsDisabled = true;
    }
}

function actionsMenuInit(title) {
    // Initialize action menu
    for (i = 0; i < document.forms.length; i++) {
        var form = document.forms[i];
        if (form.className == 'actionsmenu') {
            // Check if this form needs update
            var div = form.getElementsByTagName('div')[0];
            var label = div.getElementsByTagName('label')[0];
            if (label) {
                // This is the first time: remove label and do buton.
                div.removeChild(label);
                var dobutton = div.getElementsByTagName('input')[0];
                div.removeChild(dobutton);
                // and add menu title
                var select = div.getElementsByTagName('select')[0];
                var item = document.createElement('option');
                item.appendChild(document.createTextNode(title));
                item.value = 'show';
                select.insertBefore(item, select.options[0]);
                select.selectedIndex = 0;
            }
        }
    }
}

// use this instead of assigning to window.onload directly:
function addLoadEvent(func) {
  // alert("addLoadEvent " + func)
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function can_use_gui_editor() {
    var sAgent = navigator.userAgent.toLowerCase() ;

    // Internet Explorer
    if ( sAgent.indexOf("msie") != -1 && sAgent.indexOf("mac") == -1 && sAgent.indexOf("opera") == -1 )
    {   
        var sBrowserVersion = navigator.appVersion.match(/MSIE (.\..)/)[1] ;
        return ( sBrowserVersion >= 5.5 ) ;
    }
    
    // Gecko
    if ( navigator.product == "Gecko" && navigator.productSub >= 20030210 )
        return true ;

    // Opera
    if ( this.EnableOpera )
    {   
        var aMatch = sAgent.match( /^opera\/(\d+\.\d+)/ ) ;
        if ( aMatch && aMatch[1] >= 9.0 )
            return true ;
    }
    
    // Safari
    if ( this.EnableSafari && sAgent.indexOf( 'safari' ) != -1 )
        return ( sAgent.match( /safari\/(\d+)/ )[1] >= 312 ) ;  // Build must be at least 312 (1.3)

    return false ;

}


function update_edit_links() {
    // Update editlink according if if the browser is compatible
    if (can_use_gui_editor() == false){
        //alert("update_edit_links: can't use gui editor");
        return;
    }
    var editlinks = document.getElementsByName("editlink");
    for (i = 0; i < editlinks.length; i++) {
        var link = editlinks[i];
        href = link.href.replace('editor=textonly','editor=guipossible');
        link.href = href;
        //alert("update_edit_links: modified to guipossible");
    }
}


function add_gui_editor_links() {
    // Add gui editor link after the text editor link
    
    // If the variable is not set or browser is not compatible, exit
    try {gui_editor_link_href}
    catch (e) {
        //alert("add_gui_editor_links: gui_editor_link_href not here");
        return
    }
    if (can_use_gui_editor() == false){
        //alert("add_gui_editor_links: can't use gui_editor");
        return;
    }
    var all = document.getElementsByName('texteditlink');
    for (i = 0; i < all.length; i++) {
        var textEditorLink = all[i];
        // Create a list item with a link
        var guiEditorLink = document.createElement('a');
        guiEditorLink.href = gui_editor_link_href;
        var text = document.createTextNode(gui_editor_link_text);
        guiEditorLink.appendChild(text);
        var listItem = document.createElement('li')
        listItem.appendChild(guiEditorLink);
        // Insert in the editbar
        var editbar = textEditorLink.parentNode.parentNode
        var nextListItem = textEditorLink.parentNode.nextSibling;
        editbar.insertBefore(listItem, nextListItem);
        //alert("add_gui_editor_links: added gui editor link");
    }
}
 

function show_switch2gui() {
    // Show switch to gui editor link if the browser is compatible
    if (can_use_gui_editor() == false) return;
    
    var switch2gui = document.getElementById('switch2gui')
    if (switch2gui) {
        switch2gui.style.display = 'inline';
    }
}

function toggleComments() {
    // Toggle visibility of every tag with class == *comment*
    var all = document.getElementsByTagName('*');
    for (i = 0; i < all.length; i++){
        el = all[i];
        if ( el.className.indexOf('comment') >= 0 ){
            if ( el.style.display != 'none' ) {
                el.style.display = 'none';
            } else {
                el.style.display = '';
            }
        }
    }
}

function show_toggleComments() {
    // Show edit bar item "ToggleComments" if inline comments exist on this page
    var all = document.getElementsByTagName('*');
    var count = 0;
    for (i = 0; i < all.length; i++){
        el = all[i];
        if ( el.className.indexOf('comment') >= 0 ){
            count++;
        }
    }
    if (count > 0) {
        for (i = 0; i < all.length; i++){
            el = all[i];
            if ( el.className == 'toggleCommentsButton' ){
                el.style.display = 'inline';
            }
        }
    }
}


function load() {
    // Do not name this "onload", it does not work with IE :-)
    // TODO: create separate onload for each type of view and set the
    // correct function name in the html. 
    // e.g <body onlod='editor_onload()'>

    // login focus
    if (document.forms['loginform']) {
    	document.forms['loginform'].elements['name'].focus();
    }
    
    // Page view stuff
    update_edit_links();
    add_gui_editor_links();
    
    // Editor stuff
    show_switch2gui();

    // Enable menu item "ToggleComments" if inline comments exist
    show_toggleComments();
 
    // data browser widget
    dbw_hide_buttons();
}


function before_unload(evt) {
    // TODO: Better to set this in the editor html, as it does not make
    // sense elsehwere.
    // confirmleaving is available when editing
    try {return confirmleaving();}
    catch (e) {}
}

// Initialize after loading the page
addLoadEvent(load)

// Catch before unloading the page
window.onbeforeunload = before_unload

function dbw_update_search(dbw_id)
{
    var table = document.getElementById(dbw_id+'table');
    var cell;
    var shown;
    var i
    var cols = table.rows[0].cells.length;
    var filter = new Array();
    var dofilter = new Array();
    var form = document.forms[dbw_id+'form'];

    for (i = 0; i < cols; i++) {
        dofilter[i] = false;
        if (form[dbw_id+'filter'+i]) {
            dofilter[i] = true;
            filter[i] = form[dbw_id+'filter'+i].value;
            if (filter[i] == '[all]')
                dofilter[i] = false;
            if (filter[i] == '[empty]')
                filter[i] = '';
        }
    }

    for (i = 1; i < table.rows.length; i++) {
        var show = true;
        for (col = 0; col < cols; col++) {
            if (!dofilter[col])
                continue;

            cell = table.rows[i].cells[col];

            if (filter[col] == '[notempty]') {
                if (cell.abbr == '') {
                    show = false;
                    break;
                }
            } else if (filter[col] != cell.abbr) {
                show = false;
                break;
            }
        }
        if (show)
            table.rows[i].style.display = '';
        else
            table.rows[i].style.display = 'none';
    }
}

function dbw_hide_buttons() {
    var form;
    var elem;

    for (var fidx = 0; fidx < document.forms.length; fidx++) {
        form = document.forms[fidx];
        for (var eidx = 0; eidx < form.elements.length; eidx++) {
            elem = form.elements[eidx];
            name = elem.name;
            if (name.substr(0,4) == 'dbw.' && name.substr(-7) == '.submit')
                elem.style.display = 'none';
        }
    }
}
