var ELEMENT_NODE = 1;

var _init_togglers = new Array();

function _toggler_getToggleItemParams(class_string)
{
    var element_classes = class_string.split(/\s+/);

    var params = new Array();

    for (var i = 0; i < element_classes.length; i++) {
        if (element_classes[i].indexOf("toggler-") == 0) {
            params = element_classes[i].split("-");
            break;
        }
    }

    return params;
}

function _toggler_toggleElement(element, toggler_id, status)
{
    var params = _toggler_getToggleItemParams(element.className);

    var re = new RegExp(toggler_id + "$", "i");

    if ((params.length > 0) && (params[1] != "parent") && element.getAttribute("id").match(re)
        && params[2] != "stable")
    {
        if ((params[2] == "expanded" && status) || (params[2] == "collapsed" && !status) ||
            ((params[2] != "expanded" && params[2] != "collapsed") && status))
        {
            element.style.display = "none";
        } else {
            element.style.display = params[1];
        }
    }

    return;
}


function _toggler_toggleTree(element, toggler_id, status)
{
    var elem = element;


    for (var i = 0; i < elem.childNodes.length; i++) {
        var child = elem.childNodes.item(i);

        if (child.nodeType == ELEMENT_NODE) {
            _toggler_toggleTree(child, toggler_id, status);
        }
    }


    _toggler_toggleElement(element, toggler_id, status);

    return;
}

function _toggler_deduceToggleId(element)
{
    var togglee_id = "";

    var toggler_id = element.getAttribute("id");

    var togglee_id_offset = toggler_id.indexOf("toggler_expanded_");

    if (togglee_id_offset >= 0) {

        togglee_id_offset += "toggler_expanded_".length;

    } else {

        togglee_id_offset = toggler_id.indexOf("toggler_collapsed_");
        if (togglee_id_offset >= 0) {
            togglee_id_offset += "toggler_collapsed_".length;
        } else {

            togglee_id_offset = toggler_id.indexOf("toggler_parent_");
            if (togglee_id_offset >= 0) {
                togglee_id_offset += "toggler_parent_".length;
            } else {
                togglee_id_offset = toggler_id.indexOf("toggler_block_");
                if (togglee_id_offset >= 0) {
                    togglee_id_offset += "toggler_block_".length;
                } else {
                    togglee_id_offset = toggler_id.indexOf("toggler_element_");
                    if (togglee_id_offset >= 0) {
                        togglee_id_offset += "toggler_element_".length;
                    }
                }
            }
        }
    }

    if (togglee_id_offset >= 0) {
        togglee_id = toggler_id.substring(togglee_id_offset);
    }

    return togglee_id;
}

function toggler_clickHandler(element)
{
    var params = _toggler_getToggleItemParams(element.className);

    if (params.length > 0) {

        var togglee_id = _toggler_deduceToggleId(element);

        if (togglee_id == "") {
            /* Failed to get the togglee id */
            return false;
        }

        var toggle_block_parent;

        if (params[1] == "parent") {
            toggle_block_parent = element;
        } else {
            toggle_block_parent = document.getElementById("toggler_parent_" + togglee_id);
        }

        if (!toggle_block_parent) {
            toggle_block_parent = document.body;
        }

        /* The main  togglable block */
        var togglee = document.getElementById(togglee_id);

        if (!togglee) {
            togglee = document.getElementById("toggler_block_" + togglee_id);
        }

        /* Toggle status (false - collapsed, true - expanded */
        var status = (togglee.style.display != 'none');
        _toggler_toggleTree(toggle_block_parent, togglee_id, status);
        _toggler_toggleElement(togglee, togglee_id, status);

        return true;
    }

    return false;
}

function _toggler_init(parent)
{
    var toggle_block_parent = document.getElementById(parent);

    var togglee_id = _toggler_deduceToggleId(toggle_block_parent);

    if (togglee_id == "") {
        /* Failed to get the togglee id */
        return false;
    }

    _init_togglers.push(
        {
            tree_parent_elem: toggle_block_parent,
            togglee_id: togglee_id
        });

    return true;
}

function init_togglers()
{
    for (var i = 0; i < _init_togglers.length; i++) {
         /* The main  togglable block */
        var togglee = document.getElementById(_init_togglers[i].togglee_id);

        if (!togglee) {
            togglee = document.getElementById("toggler_block_" + _init_togglers[i].togglee_id);
        }

        var params = _toggler_getToggleItemParams(togglee.className);

        if (params.length > 1) {
            var status = true; // overall default is collapsed
            if (params[2] == "initcollapsed") {
                status = true;
            } else if (params[2] == "initexpanded") {
                status = false;
            }

            _toggler_toggleTree(_init_togglers[i].tree_parent_elem, _init_togglers[i].togglee_id, status);
            _toggler_toggleElement(togglee, _init_togglers[i].togglee_id, status);
        }


    }

    _init_togglers = new Array();
}