/******************************************************************************************************************
* @name: bPopup
* @type: jQuery
* @author: Bjoern Klinggaard (http://dinbror.dk/bpopup)
* @version: 0.3.6
* @requires jQuery 1.3
*
* DEFAULT VALUES:
* amsl(Above Mean Sea Level): 150px // Vertical distance from the middle of the window, + = above, - = under
* appendTo: 'body' // Which element the popup should append to (append to 'form' when ASP.net)
* closeClass: 'bClose' // Class to bind the close event to
* escClose: true // Close on esc
* fadeSpeed: 250 // Animation speed on fadeIn/out
* follow: true // Should the popup follow the screen on scroll/resize? 
* followSpeed: 500 // Animation speed for the popup on scroll/resize
* loadUrl: null // External page or selection to load in popup
* modal: true // Modal overlay
* modalColor: #000 // Modal overlay color
* overlay: 0.5 // Transparency, from 0.1 to 1.0 (filled)
* scrollBar: true // Scrollbars visible
* vStart: null // Vertical start position for popup
* xLink: false // Xlink popup
* zIndex: 9999 // Popup z-index, modal overlay = popup z-index - 1
*
* TODO: REFACTOR CODE!!! easing
*******************************************************************************************************************/
(function($) {
	$.fn.openPopup = function(options, callback) {
		if ($.isFunction(options)) {
			callback = options;
			options = null;
		}
		o = $.extend({}, $.fn.openPopup.defaults, options);

		//HIDE SCROLLBAR?  
		if (!o.scrollBar) {
			$('html').css('overflow', 'hidden');
		}

		var $selector = $(this),
		$modal = $('<div id="bModal"></div>'),
		d = $(document),
		w = $(window),
		cp = getCenterPosition($selector, o.amsl),
		vPos = cp[0],
		hPos = cp[1],
		isIE6 = $.browser.msie
			&& parseInt($.browser.version) == 6
			&& typeof window['XMLHttpRequest'] != 'object'; // browser sniffing is bad

		return this.each(function() {
			// MODAL OVERLAY
			if (o.modal) {
				$modal.css(getModalStyle()).appendTo(o.appendTo).animate({ 'opacity': o.opacity }, o.fadeSpeed);
			}
			// OPEN POPUP  
			create();
		});

		////////////////////////////////////////////////////////////////////////////////////////////////////////////
		// HELP FUNCTIONS - PRIVATE
		////////////////////////////////////////////////////////////////////////////////////////////////////////////
		function create() {
			var hasInputField = $('input[type=text]', $selector).length != 0;
			var t = o.vStart != null ? o.vStart : d.scrollTop() + vPos;
			if (o.xLink) {
				//Not generic yet
				$('a#bContinue').attr({ 'href': $('a.xlink').attr('href') }); $('a#bContinue .btnLink').text($('a.xlink').attr('title'))
			}
			var m_left = d.scrollLeft() + hPos;
			if (d.scrollLeft() + hPos >= 309)
				m_left = 309;

			$selector.css({ 'left': m_left, 'position': 'absolute', 'top': t, 'z-index': o.zIndex }).appendTo(o.appendTo).hide(function() {
				if (hasInputField) {
					// Resets input fields
					$selector.each(function() {
						$selector.find('input[type=text]').val('');
					});
				}
				if (o.loadUrl != null)
					$selector.load(o.loadUrl);
			}).fadeIn(o.fadeSpeed, function() {
				if (hasInputField) {
					$selector.find('input[type=text]:first').focus();
				}
				// Triggering the callback if set    
				$.isFunction(callback) && callback();
			});
			//BIND EVENTS
			bindEvents();
		}
		function close() {
			if (o.modal) {
				$('#bModal').fadeOut(o.fadeSpeed, function() {
					$('#bModal').remove();
				});
			}
			$selector.fadeOut(o.fadeSpeed, function() {
				if (o.loadUrl != null)
					$selector.empty();
			});
			unbindEvents();
		}
		function getModalStyle() {
			if (isIE6) {
				var dd = getDocumentDimensions();
				return { 'background-color': o.modalColor, 'height': dd[0], 'left': getDistanceToBodyFromLeft(), 'opacity': 0, 'position': 'absolute', 'top': 0, 'width': dd[1], 'z-index': o.zIndex - 1 };
			}
			else
				return { 'background-color': o.modalColor, 'height': '100%', 'left': 0, 'opacity': 0, 'position': 'fixed', 'top': 0, 'width': '100%', 'z-index': o.zIndex - 1 };
		}
		function bindEvents() {
			$('.' + o.closeClass).live('click', function() {
				close();
				return false;
			});
			if (o.follow) {
				w.bind('scroll.bPopup', function() {
					$selector.stop().animate({ 'left': d.scrollLeft() + hPos, 'top': d.scrollTop() + vPos }, o.followSpeed);
				}).bind('resize.bPopup', function() {           	// MODAL OVERLAY IE6
					if (o.modal && isIE6) {
						var dd = getDocumentDimensions();
						$modal.css({ 'height': dd[0], 'width': dd[1], 'left': getDistanceToBodyFromLeft() });
					}
					// POPUP
					var pos = getCenterPosition($selector, o.amsl);
					vPos = pos[0];
					hPos = pos[1];
					$selector.stop().animate({ 'left': d.scrollLeft() + hPos, 'top': d.scrollTop() + vPos }, o.followSpeed);
				});
			}
			if (o.escClose) {
				d.bind('keydown.bPopup', function(e) {
					if (e.which == 27) {  //escape
						close();
					}
				});
			}
		}
		function unbindEvents() {
			if (!o.scrollBar) {
				$('html').css('overflow', 'auto');
			}
			$('.' + o.closeClass).die('click');
			d.unbind('keydown.bPopup');
			w.unbind('.bPopup');
		}
		function getDocumentDimensions() {
			return [d.height(), d.width()];
		}
		function getDistanceToBodyFromLeft() {
			return (w.width() < $('body').width()) ? 0 : ($('body').width() - w.width()) / 2;
		}
		function getCenterPosition(s, a) {
			var vertical = ((w.height() - s.height()) / 2) - a;
			var horizontal = ((w.width() - s.width()) / 2) + getDistanceToBodyFromLeft();
			return [vertical < 20 ? 20 : vertical, horizontal];
		}
	};
	$.fn.openPopup.defaults = {
		amsl: 150,
		appendTo: 'body',
		closeClass: 'bClose',
		escClose: true,
		fadeSpeed: 250,
		follow: true,
		followSpeed: 500,
		loadUrl: null,
		modal: true,
		modalColor: '#000',
		opacity: 0.5,
		scrollBar: true,
		xLink: false,
		zIndex: 9999
	};

	$.fn.closePopup = function() {
		$(this).trigger('click');
	}
})(jQuery);