/* Copyright (c) 2008 Kean Loong Tan http://www.gimiti.com/kltan
 * Licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * Version: 1.1 (March 26, 2008)
 * Requires: jQuery 1.2+
 */
 
(function($) {

    var dialogDisplayed = false;
    var currentPos = true;

    $.fn.createDialog = function(options) {

        // Extend our default options with those provided.
        var opts = $.extend({}, $.fn.createDialog.defaults, options);
        $(this).click(function() {
            currentPos = opts.center;
            if (!dialogDisplayed) { //display dialog if none is there
                $("body").prepend('<div id="jDialogProgressBar"><img src="/images/ajax-loader.gif" class="loadergif" /></div><div id="jDialogOverlay"></div><div id="jDialogContainer"></div>');
                overlayPos(1);
                dialogDisplayed = true;
            }

            if (opts.progress)
                $("#jDialogProgressBar").show();

            $.ajax({
                type: opts.method,
                data: opts.data,
                url: opts.addr,
                success: function(msg) {
                    $("#jDialogContainer").html(msg);
                    if (currentPos)
                        reposition();
                    $("#jDialogProgressBar").fadeOut(900);
                }
            });
            //only IE6 needs this function
            if ($.browser.msie && parseInt($.browser.version) < 7) {
                $(window).scroll(function() {
                    if (dialogDisplayed == 1) {
                        overlayPos();
                        if (currentPos)
                            reposition();
                    }
                });
            }
            $(window).resize(function() {
                if (dialogDisplayed == 1) {
                    overlayPos();
                    if (currentPos)
                        reposition();
                }
            });

            $(window).unload(function() {
                if (dialogDisplayed == 1)
                    $.closeDialog();
            });

            $(window).keydown(function(event) {
                if (event.keyCode == 27)
                    $.closeDialog();
            });

        });

        //private function
        function overlayPos(init) {
            var left = 0;
            var top = 0;
            var overlayWidth = $(window).width();
            var overlayHeight = $(document).height();
            var winHeight = $(window).height();

            if ($.browser.msie && parseInt($.browser.version) < 7) { //if IE6
                $("#jDialogOverlay").css({
                    top: 0,
                    left: 0,
                    width: overlayWidth,
                    height: overlayHeight,
                    position: "absolute",
                    display: "block",
                    color: opts.bg,
                    zIndex: opts.index
                });
            }
            else { //other browsers
                $("#jDialogOverlay").css({
                    top: 0,
                    left: 0,
                    width: overlayWidth,
                    height: winHeight,
                    position: "fixed",
                    display: "block",
                    background: opts.bg,
                    zIndex: opts.index
                }).show();
            }

            if (init == 1) {
                $("#jDialogOverlay").css("opacity", 0);
                $("#jDialogOverlay").fadeTo(200, opts.opacity);
            }
        }

        //private function
        function reposition() { //calculate the position
            var left = 0;
            var top = 0;
            var winWidth = $(window).width();
            var winHeight = $(window).height();
            var dialogHeight = $("#jDialogContainer").children().height();
            var dialogWidth = $("#jDialogContainer").children().width();

            if ($.browser.msie) {
                left = document.body.scrollLeft || document.documentElement.scrollLeft;
                top = document.body.scrollTop || document.documentElement.scrollTop;
            }
            else {
                left = window.pageXOffset;
                top = window.pageYOffset;
            }

            var topOff = top + winHeight / 2 - dialogHeight / 2; //offset for IE6
            var leftOff = left + winWidth / 2 - dialogWidth / 2; //offset for IE6
            var topFixed = topOff - top;
            var leftFixed = leftOff - left;

            if ($.browser.msie && parseInt($.browser.version) < 7) { // IE6
                //IE 6 fix
                $("select").hide();
                //IE 6 fix
                $("#jDialogContainer select").show();
                //IE6 doesn't support fixed position
                $("#jDialogContainer").children().css({
                    top: topOff,
                    left: leftOff,
                    position: "absolute",
                    zIndex: (opts.index + 1)
                }).show();
            }
            else {	// firefox and IE7
                $("#jDialogContainer").children().css({
                    top: topFixed,
                    left: leftFixed,
                    position: "fixed",
                    zIndex: (opts.index + 1)
                }).show();
            }
        }
    };

    $.fn.createDialog.defaults = {
        progress: true,
        center: true,
        method: 'GET',
        data: '',
        opacity: 0.85,
        bg: '#FFFFFF',
        index: 2000
    };

    $.closeDialog = function() {
        dialogDisplayed = false;
        if ($.browser.msie && parseInt($.browser.version) < 7) //IE6 bug
            $("select").show();
        //fade out and remove DOM nodes
        $("#jDialogOverlay").fadeTo(200, 0, function() {
            $("#jDialogContainer, #jDialogOverlay, #jDialogProgressBar").remove();
        });

    };

})(jQuery);