/**
 * Cookie plugin
 *
 * Copyright (c) 2006 Klaus Hartl (stilbuero.de)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 */

/**
 * Create a cookie with the given name and value and other optional parameters.
 *
 * @example $.cookie('the_cookie', 'the_value');
 * @desc Set the value of a cookie.
 * @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true });
 * @desc Create a cookie with all available options.
 * @example $.cookie('the_cookie', 'the_value');
 * @desc Create a session cookie.
 * @example $.cookie('the_cookie', null);
 * @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain
 *       used when the cookie was set.
 *
 * @param String name The name of the cookie.
 * @param String value The value of the cookie.
 * @param Object options An object literal containing key/value pairs to provide optional cookie attributes.
 * @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object.
 *                             If a negative value is specified (e.g. a date in the past), the cookie will be deleted.
 *                             If set to null or omitted, the cookie will be a session cookie and will not be retained
 *                             when the the browser exits.
 * @option String path The value of the path atribute of the cookie (default: path of page that created the cookie).
 * @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie).
 * @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will
 *                        require a secure protocol (like HTTPS).
 * @type undefined
 *
 * @name $.cookie
 * @cat Plugins/Cookie
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */

/**
 * Get the value of a cookie with the given name.
 *
 * @example $.cookie('the_cookie');
 * @desc Get the value of a cookie.
 *
 * @param String name The name of the cookie.
 * @return The value of the cookie.
 * @type String
 *
 * @name $.cookie
 * @cat Plugins/Cookie
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */
jQuery.cookie = function(name, value, options) {
    if (typeof value != 'undefined') { // name and value given, set cookie
        options = options || {};
        if (value === null) {
            value = '';
            options.expires = -1;
        }
        var expires = '';
        if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
            var date;
            if (typeof options.expires == 'number') {
                date = new Date();
                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
            } else {
                date = options.expires;
            }
            expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
        }
        // CAUTION: Needed to parenthesize options.path and options.domain
        // in the following expressions, otherwise they evaluate to undefined
        // in the packed version for some reason...
        var path = options.path ? '; path=' + (options.path) : '';
        var domain = options.domain ? '; domain=' + (options.domain) : '';
        var secure = options.secure ? '; secure' : '';
        document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
    } else { // only name given, get cookie
        var cookieValue = null;
        if (document.cookie && document.cookie != '') {
            var cookies = document.cookie.split(';');
            for (var i = 0; i < cookies.length; i++) {
                var cookie = jQuery.trim(cookies[i]);
                // Does this cookie string begin with the name we want?
                if (cookie.substring(0, name.length + 1) == (name + '=')) {
                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                    break;
                }
            }
        }
        return cookieValue;
    }
};


/*
 * 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.
 * API rewrite by Lauris Buk?is-Haberkorns
 */

(function($) {

function History()
{
	this._curHash = '';
	this._callback = function(hash){};
};

$.extend(History.prototype, {

	init: function(callback, prefix, selector, secondcallback) {
		this._callback = callback;
		this._curHash = location.hash;

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

			// add hidden iframe for IE
			$("body").prepend('<iframe id="jQuery_history" style="display: none;"></iframe>');
			var iframe = $("#jQuery_history")[0].contentWindow.document;
			iframe.open();
			iframe.close();
			iframe.location.hash = this._curHash;
		}
		else if ($.browser.safari) {
			// etablish back/forward stacks
			this._historyBackStack = [];
			this._historyBackStack.length = history.length;
			this._historyForwardStack = [];
			this._isFirst = true;
			this._dontCheck = false;
		}

                var tmpthis = this;

                $(selector).each(function(){

                    this.oldhref = this.href;
                    hash = '#' + prefix + (this.title && this.title.replace(/\s/g, '_'));
                    this.href = hash;

                    $(this).unbind('click').click(function(e) {
                        $(e.target)[0].clickedonce = true;

                        tmpthis.load(e.target);
                    });
                });

		this._callback(this._curHash);
		setInterval(this._check, 100);
	},

	add: function(hash) {
		// This makes the looping function do something
		this._historyBackStack.push(hash);

		this._historyForwardStack.length = 0; // clear forwardStack (true click occured)
		this._isFirst = true;
	},

	_check: function() {
		if($.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 != $.history._curHash) {

				location.hash = current_hash;
				$.history._curHash = current_hash;
				$.history._callback(current_hash);

			}
		} else if ($.browser.safari) {
			if (!$.history._dontCheck) {
				var historyDelta = history.length - $.history._historyBackStack.length;

				if (historyDelta) { // back or forward button has been pushed
					$.history._isFirst = false;
					if (historyDelta < 0) { // back button has been pushed
						// move items to forward stack
						for (var i = 0; i < Math.abs(historyDelta); i++) $.history._historyForwardStack.unshift($.history._historyBackStack.pop());
					} else { // forward button has been pushed
						// move items to back stack
						for (var i = 0; i < historyDelta; i++) $.history._historyBackStack.push($.history._historyForwardStack.shift());
					}
					var cachedHash = $.history._historyBackStack[$.history._historyBackStack.length - 1];
					if (cachedHash != undefined) {
						$.history._curHash = location.hash;
						$.history._callback(cachedHash);
					}
				} else if ($.history._historyBackStack[$.history._historyBackStack.length - 1] == undefined && !$.history._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) {
						$.history._callback(document.URL.split('#')[1]);
					} else {
						$.history._callback('');
					}
					$.history._isFirst = true;
				}
			}
		} else {
			// otherwise, check for location.hash
			var current_hash = location.hash;
			if(current_hash != $.history._curHash) {
				$.history._curHash = current_hash;
				$.history._callback(current_hash);
			}
		}
	},

	load: function(obj) {
                var hash = (typeof(obj) == "object") ? obj.hash : obj;
		var newhash;

		if ($.browser.safari) {
			newhash = hash;
		} else {
			newhash = hash;
			location.hash = newhash;
		}
		this._curHash = newhash;

		if ($.browser.msie) {
			var ihistory = $("#jQuery_history")[0]; // TODO: need contentDocument?
			var iframe = ihistory.contentWindow.document;
			iframe.open();
			iframe.close();
			iframe.location.hash = newhash;
			this._callback(obj);
		}
		else if ($.browser.safari) {
			this._dontCheck = true;
			// Manually keep track of the history values for Safari
			this.add(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() {$.history._dontCheck = false;};
			window.setTimeout(fn, 200);
			this._callback(obj);
			// 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 {
		  this._callback(obj);
		}
	}
});

$(document).ready(function() {
	$.history = new History(); // singleton instance
});

})(jQuery);