// Permissions table root element
var areasPermissionTable = null;

// Sets by recursion or removes checks from child permissions for the specified one.
// If parent item checked, all child items set checked too.
// If parent item unchecked all child items set unchecked too.
function processChildLinks(item) {
    var permissionId = $(item).val();
    var currentVal = $(item).prop("checked");
    var currentItemName = $(item).attr('name');
    var childItems = $(areasPermissionTable).find('input[name=' + currentItemName + '][data-parent-item=' + permissionId + ']');

    if (childItems.length > 0) {
        $.each(childItems, function (index, childItem) {
            var childVal = $(childItem).prop("checked");
            if (currentVal != childVal) {
                $(childItem).click();
            }
        });
    }
}

// Sets by recursion or removes checks from parent permissions for the specified one.
// If item checked, all parent items set checked too.
// If item unchecked, and its parent doesn't have any other checked child items, parent set unchecked too.
function processParentLinks(item) {
    var currentVal = $(item).prop("checked");
    var parentPermissionId = $(item).attr('data-parent-item');

    if (parentPermissionId && (parentPermissionId.length > 0)) {
        var currentItemName = $(item).attr('name');
        var parentItems = $(areasPermissionTable).find('input[name=' + currentItemName + '][value=' + parentPermissionId + ']');

        if (parentItems.length > 0) {
            var parentItem = parentItems.get(0);
            var parentVal = $(parentItem).prop("checked");
            var processFunction = null;

            if (currentItemName == 'areaswrite')
                processFunction = writePermissionItemClick;

            if (currentItemName == 'areasread') {
                processFunction = readPermissionItemClick;
            }

            if (currentVal != parentVal) {
                if (currentVal) {
                    // Items was checked. We must check all parent items
                    processFunction(parentItem, false, false);
                }
                else {
                    // Item was unchecked. We must uncheck all parent items, if they have no checked childs
                    var checkedChilds = $(areasPermissionTable).find('input[name=' + currentItemName + '][data-parent-item=' + parentPermissionId + ']')
						.filter(':checked');
                    if (checkedChilds.length < 1) {
                        // Items was checked. We must check all parent items
                        processFunction(parentItem, false, false);
                    }
                }

                processParentLinks(parentItem);
            }
        }
    }
}

// If item was unchecked, the corresponding write permission set unchecked too.
// Param processChildren used to avoid inproper checks of all child items for the current parent item
function readPermissionItemClick(item, fromUi, processChildren) {
    $(item).removeAttr("inherited");
    var readVal = $(item).prop("checked");

    if (!fromUi) {
        readVal = !readVal;
        $(item).prop("checked", readVal);
    }

    var permissionId = $(item).val();
    var write = $(item).parent().find("input[value='" + permissionId + "'][name='areaswrite']");

    if ((write.length > 0) && !readVal) {
        var writeVal = $(write).prop("checked");
        if (writeVal) {
            writePermissionItemClick(write, false, processChildren);
        }
    }

    if (processChildren)
        processChildLinks(item);

    processParentLinks(item);
}

// If item was checked, the corresponding read permission set checked too.
// Param processChildren used to avoid inproper checks of all child items for the current parent item
function writePermissionItemClick(item, fromUi, processChildren) {
    $(item).removeAttr("inherited");
    var writeVal = $(item).prop("checked");

    if (!fromUi) {
        writeVal = !writeVal;
        $(item).prop("checked", writeVal);
    }

    var permissionId = $(item).val();
    var read = $(item).parent().find("input[value='" + permissionId + "'][name='areasread']");

    if ((read.length > 0) && writeVal) {
        var readVal = $(read).prop("checked");
        if (!readVal) {
            readPermissionItemClick(read, false, processChildren);
        }
    }

    if (processChildren)
        processChildLinks(item);

    processParentLinks(item);
};