/*
* jQuery history plugin
*
* Copyright (c) 2006 Taku Sano (Mikage Sawatari)
* Licensed under the MIT License:
*   http://www.opensource.org/licenses/mit-license.php
*
* Modified by Lincoln Cooper to add Safari support and only call the callback once during initialization
* for msie when no initial hash supplied.
  
*********************************************************************************************************************
********* NOTE: This has been modified specifically for OGM. Do not replace this file with a newer version. *********
*********************************************************************************************************************

*/


jQuery.extend({
    historyCurrentHash: undefined,
    historyCallback: undefined,

    historyInit: function(callback) {
        jQuery.historyCallback = callback;

        var current_hash = location.hash;

        jQuery.historyCurrentHash = current_hash;
        if (jQuery.browser.msie) {
            // To stop the callback firing twice during initilization if no hash present
            if (jQuery.historyCurrentHash == '') {
                jQuery.historyCurrentHash = '#';
            }

            // add hidden iframe for IE
            $("body").prepend('<iframe id="jQuery_history" style="display: none;"></iframe>');
            var ihistory = $("#jQuery_history")[0];
            var iframe = ihistory.contentWindow.document;
            iframe.open();
            iframe.close();
            iframe.location.hash = current_hash;
        }
        else if ($.browser.safari) {
            // etablish back/forward stacks
            jQuery.historyBackStack = [];
            jQuery.historyBackStack.length = history.length;
            jQuery.historyForwardStack = [];

            jQuery.isFirst = true;
        }

        jQuery.historyCallback(current_hash.replace(/^#/, ''));
        setInterval(jQuery.historyCheck, 100);
    },

    historyAddHistory: function(hash) {
        // This makes the looping function do something
        jQuery.historyBackStack.push(hash);

        jQuery.historyForwardStack.length = 0; // clear forwardStack (true click occured)
        this.isFirst = true;
    },

    historyCheck: function() {
        if (jQuery.browser.msie) {
            // On IE, check for location.hash of iframe
            var ihistory = $("#jQuery_history")[0];
            var iframe = ihistory.contentDocument || ihistory.contentWindow.document;
            var current_hash = iframe.location.hash;
            if (current_hash != jQuery.historyCurrentHash) {

                location.hash = current_hash;
                jQuery.historyCurrentHash = current_hash;
                jQuery.historyCallback(current_hash.replace(/^#/, ''));

            }
        } else if ($.browser.safari) {
            if (!jQuery.dontCheck) {
                var historyDelta = history.length - jQuery.historyBackStack.length;

                if (historyDelta) { // back or forward button has been pushed
                    jQuery.isFirst = false;
                    if (historyDelta < 0) { // back button has been pushed
                        // move items to forward stack
                        for (var i = 0; i < Math.abs(historyDelta); i++) jQuery.historyForwardStack.unshift(jQuery.historyBackStack.pop());
                    } else { // forward button has been pushed
                        // move items to back stack
                        for (var i = 0; i < historyDelta; i++) jQuery.historyBackStack.push(jQuery.historyForwardStack.shift());
                    }
                    var cachedHash = jQuery.historyBackStack[jQuery.historyBackStack.length - 1];
                    if (cachedHash != undefined) {
                        jQuery.historyCurrentHash = location.hash;
                        jQuery.historyCallback(cachedHash);
                    }
                } else if (jQuery.historyBackStack[jQuery.historyBackStack.length - 1] == undefined && !jQuery.isFirst) {
                    // back button has been pushed to beginning and URL already pointed to hash (e.g. a bookmark)
                    // document.URL doesn't change in Safari
                    if (document.URL.indexOf('#') >= 0) {
                        jQuery.historyCallback(document.URL.split('#')[1]);
                    } else {
                        var current_hash = location.hash;
                        jQuery.historyCallback('');
                    }
                    jQuery.isFirst = true;
                }
            }
        } else {
            // otherwise, check for location.hash
            var current_hash = location.hash;
            if (current_hash != jQuery.historyCurrentHash) {
                jQuery.historyCurrentHash = current_hash;
                jQuery.historyCallback(current_hash.replace(/^#/, ''));
            }
        }
    },
    historyLoad: function(hash) {

        var newhash;

        if (jQuery.browser.safari) {
            newhash = hash;
        }
        else {
            newhash = '#' + hash;
            location.hash = newhash;
        }
        jQuery.historyCurrentHash = newhash;

        if (jQuery.browser.msie) {
            var ihistory = $("#jQuery_history")[0];
            var iframe = ihistory.contentWindow.document;
            iframe.open();
            iframe.close();
            iframe.location.hash = newhash;
            jQuery.historyCallback(hash);
        }
        else if (jQuery.browser.safari) {
            jQuery.dontCheck = true;
            // Manually keep track of the history values for Safari
            this.historyAddHistory(hash);

            // Wait a while before allowing checking so that Safari has time to update the "history" object
            // correctly (otherwise the check loop would detect a false change in hash).
            var fn = function() { jQuery.dontCheck = false; };
            window.setTimeout(fn, 200);
            jQuery.historyCallback(hash);
            // N.B. "location.hash=" must be the last line of code for Safari as execution stops afterwards.
            //      By explicitly using the "location.hash" command (instead of using a variable set to "location.hash") the
            //      URL in the browser and the "history" object are both updated correctly.
            location.hash = newhash;
        }
        else {
            jQuery.historyCallback(hash);
        }
    },

    _ctrlId: undefined,
    _viewUrl: undefined,
    _loadingClass: undefined,
    _loadingTimeout: undefined,
    _defaultHash: undefined,
    _doLoadAfterPageLoad: undefined,
    _pageQsKey: undefined,

    JQueryUpdatePanelInit: function(ctrlId, viewUrl, loadingClass, loadingTimeout, defaultHash, pageQsKey, doLoadAfterPageLoad) {
        // Initialize the history plugin if paging is being used	    
        if (pageQsKey != undefined && pageQsKey != "") {
            $._ctrlId = ctrlId;
            $._viewUrl = viewUrl;
            if (pageQsKey != "") $._viewUrl = $._viewUrl + ((viewUrl.indexOf("?") >= 0) ? "&" : "?") + pageQsKey + "=";

            $._loadingClass = loadingClass;
            $._loadingTimeout = loadingTimeout;
            $._defaultHash = defaultHash;
            $._doLoadAfterPageLoad = doLoadAfterPageLoad;
            $._pageQsKey = pageQsKey;

            $.historyInit($.LoadViewWithHistory);
        }
        else {
            $.LoadView("", ctrlId, viewUrl, loadingClass, loadingTimeout, defaultHash, pageQsKey, doLoadAfterPageLoad);
        }
    },

    LoadView: function(hash, ctrlId, viewUrl, loadingClass, loadingTimeout, defaultHash, pageQsKey, doLoadAfterPageLoad) {

        var refreshCount = ($("#" + $._ctrlId).data("RefreshCount") == undefined) ? 0 : $("#" + $._ctrlId).data("RefreshCount");
        // Hide the loading control if we're not loading something else already
        if (refreshCount == 0)
            $("." + loadingClass).attr("style", "display:none");
        $("." + loadingClass).data("IsLoaded", false);

        // If the content has been loaded via non-javascript, no need to load it again
        if (!doLoadAfterPageLoad) {
            if ($("#" + ctrlId).data("IsFirstLoad") != false) {
                $("#" + ctrlId).data("IsFirstLoad", false);
                $("." + loadingClass).data("IsLoaded", true);
            }
        }

        // If no hash is present, set it to the DefaultQueryStringValue
        if (hash == "undefined" || hash == "")
            hash = defaultHash;
        else // If there is a hash, then load it, regardless if this is firstload (bookmark support) 
            $("." + loadingClass).data("IsLoaded", false);

        // show the loading template after the Timeout period. (setTimeout acts as if a new thread gets created for the timeout function)
        setTimeout("$.LoadJQueryUpdatePanelStart('" + loadingClass + "')", loadingTimeout);

        // Load the view's contents if needed
        if ($("." + loadingClass).data("IsLoaded") == false) {
            var sViewUrl = (pageQsKey != "") ? (viewUrl + hash) : viewUrl; // if we're paging, add the hash
            $("#" + ctrlId).load(sViewUrl, null, function() {
                // Only hide the loading symbol if we're completely done loading ALL content for this view
                var refreshCount = ($("#" + ctrlId).data("RefreshCount") == undefined) ? 1 : $("#" + ctrlId).data("RefreshCount");
                refreshCount--;
                if (refreshCount < 0) refreshCount = 0;
                $("#" + ctrlId).data("RefreshCount", refreshCount);
                if (refreshCount == 0) {
                    $("." + loadingClass).data("IsLoaded", true);
                    $("." + loadingClass).attr("style", "display:none");
                }
            });
        }
    },

    LoadViewWithHistory: function(hash) {
        $.LoadView(hash, $._ctrlId, $._viewUrl, $._loadingClass, $._loadingTimeout, $._defaultHash, $._pageQsKey, $._doLoadAfterPageLoad);
    },

    LoadJQueryUpdatePanelStart: function(loadingClass) {
        if ($("." + loadingClass).data("IsLoaded") != true)
            $("." + loadingClass).removeAttr("style");
    },

    RefreshView: function(viewUrl, bDoKeepCurrentPage) // format: "vwPage.aspx?key=value&page=" don't add the page value
    {
        var hash = (bDoKeepCurrentPage) ? location.hash.replace(/^#/, '') : "";
        $._viewUrl = viewUrl;

        // Remember how many times refresh has been set so we know when its COMPLETELY done loading
        var refreshCount = ($("#" + $._ctrlId).data("RefreshCount") == undefined) ? 0 : $("#" + $._ctrlId).data("RefreshCount");
        refreshCount++;
        $("#" + $._ctrlId).data("RefreshCount", refreshCount);

        $.LoadViewWithHistory(hash);
    }

});