/**
 * History
 *
 * Manipuliert die URL bei Ajax-Calls, um eine History zu realisieren.
 *
 * @copyright Copyright (c) 2014 DMK E-BUSINESS GmbH <dev@dmk-ebusiness.de>
 * @license http://www.gnu.org/licenses/lgpl.html
 *             GNU Lesser General Public License, version 3 or later
 * @version 0.1.0
 * @requires jQuery, Base, Location
 * @author Michael Wagner <michael.wagner@dmk-ebusiness.de>
 */
(function(DMK, w, d, $){
    "use strict";
    var History, _loc = d.location, VERSION = "0.1.0";

    if (!DMK.Base.isDefined(DMK.Objects.Location)) {
        throw "DMK.History requires DMK.Location";
    }

    History = function History() {
        this.setData("version", VERSION);
        this.setData(
            "last_path",
            _loc.pathname + _loc.search + _loc.hash
        );
        this.setData(
            "support_push_state",
            ("pushState" in w.history) && w.history.pushState !== null
        );
    };

    // wir erben von dem basis objekt
    History = DMK.Base.extend(History);

    History.prototype.init = function() {
        if (this.getData("support_push_state")) {
            w.addEventListener("popstate", this.onHistoryChanged, false);
        } else {
            w.setInterval(this.onHistoryChanged, 500);
        }
    };

    History.prototype.onHistoryChanged = function(event) {
        var _self = DMK.History,
            currentPath = _loc.pathname + _loc.search + _loc.hash
        ;
        if (!_self.getData("support_push_state")) {
            if (_loc.hash.length > 0) {
                currentPath = _loc.hash.slice(2);
            }
        }
        if (currentPath !== _self.getData("last_path")) {
            _self.setData("last_path", currentPath);
            if (!_self.doRequestOnHistoryChanged(currentPath)) {
                return; //stopImmediatePropagation vermeiden, wenn der request fehlerhaft war
            }
        }
        if (_self.getData("support_push_state")) {
            event.stopImmediatePropagation();
        }
    };

    History.prototype.doRequestOnHistoryChanged = function(url) {
        // @TODO: how to manage the ajax calls on history change?
        _loc.href = url;
        return false;
    };

    History.prototype.setHistoryUrl = function(url) {
        var
            href = _loc.href,
            ParsedUrl = DMK.Objects.getInstance("Location", url),
            currentPath = ParsedUrl.getPath()
                    + (
                        ParsedUrl.getQuery()
                            ? "?" + ParsedUrl.getQuery()
                            : ""
                    )
                    + (
                        ParsedUrl.getAnchor()
                            ? "#" + ParsedUrl.getAnchor()
                            : ""
                    )
        ;
        this.setData("last_path", currentPath);
        if (this.getData("support_push_state")) {
            w.history.pushState("", "", currentPath);
        }
        else {
            w.location.href = (
                href.indexOf("#") >= 0
                    ? href.slice(0, href.indexOf("#"))
                    : href
                )  + "#!" + currentPath
            ;
        }
    };

    // add lib to basic library
    DMK.Libraries.add(History);

})(DMK, window, document, jQuery);