/**
* jmpopups
* Copyright (c) 2009 Otavio Avila (http://otavioavila.com)
* Licensed under GNU Lesser General Public License
* 
* @docs http://jmpopups.googlecode.com/
* @version 0.5.1
* 
*/


(function($) {
	var openedPopups = [];
	var popupLayerScreenLocker = false;
	var focusableElement = [];
	var setupJqueryMPopups = {
		screenLockerBackground: "#000",
		screenLockerOpacity: "0.5"
	};

	var resizingTimeoutID;

	$.setupJMPopups = function(settings) {
		setupJqueryMPopups = jQuery.extend(setupJqueryMPopups, settings);
		return this;
	};

	$.openPopupLayer = function(settings) {
		if (typeof (settings.name) != "undefined" && !checkIfItExists(settings.name)) {
			settings = jQuery.extend({
				width: "auto",
				height: "auto",
				parameters: {},
				target: "",
				success: function() { },
				error: function() { },
				beforeClose: function() { },
				afterClose: function() { },
				reloadSuccess: null,
				cache: false
			}, settings);
			loadPopupLayerContent(settings, true);
			return this;
		}
	};

	$.closePopupLayer = function(name) {
		if (name) {
			for (var i = 0; i < openedPopups.length; i++) {
				if (openedPopups[i].name == name) {
					var thisPopup = openedPopups[i];

					openedPopups.splice(i, 1);

					thisPopup.beforeClose();

					$("#popupLayer_" + name).fadeOut(function() {
						$("#popupLayer_" + name).remove();

						focusableElement.pop();

						if (focusableElement.length > 0) {
							$(focusableElement[focusableElement.length - 1]).focus();
						}

						thisPopup.afterClose();
						hideScreenLocker(name);
					});



					break;
				}
			}
		} else {
			if (openedPopups.length > 0) {
				$.closePopupLayer(openedPopups[openedPopups.length - 1].name);
			}
		}

		return this;
	};

	$.reloadPopupLayer = function(name, callback) {
		if (name) {
			for (var i = 0; i < openedPopups.length; i++) {
				if (openedPopups[i].name == name) {
					if (callback) {
						openedPopups[i].reloadSuccess = callback;
					}

					loadPopupLayerContent(openedPopups[i], false);
					break;
				}
			}
		} else {
			if (openedPopups.length > 0) {
				$.reloadPopupLayer(openedPopups[openedPopups.length - 1].name);
			}
		}

		return this;
	};

	function setScreenLockerSize() {
		if (popupLayerScreenLocker) {
			$('#popupLayerScreenLocker').height($(document).height() + "px");
			$('#popupLayerScreenLocker').width($(document.body).outerWidth(true) + "px");
		}
	}

	function checkIfItExists(name) {
		if (name) {
			for (var i = 0; i < openedPopups.length; i++) {
				if (openedPopups[i].name == name) {
					return true;
				}
			}
		}
		return false;
	}

	function showScreenLocker() {
		if ($("#popupLayerScreenLocker").length) {
			if (openedPopups.length == 1) {
				popupLayerScreenLocker = true;
				setScreenLockerSize();
				$('#popupLayerScreenLocker').fadeIn();
			}

			if ($.browser.msie && $.browser.version < 7) {
				$("select:not(.hidden-by-jmp)").addClass("hidden-by-jmp hidden-by-" + openedPopups[openedPopups.length - 1].name).css("visibility", "hidden");
			}

			$('#popupLayerScreenLocker').css("z-index", parseInt(openedPopups.length == 1 ? 999 : $("#popupLayer_" + openedPopups[openedPopups.length - 2].name).css("z-index"), 10) + 1);
		} else {
			$("body").append("<div id='popupLayerScreenLocker'><!-- --></div>");
			$("#popupLayerScreenLocker").css({
				position: "absolute",
				background: setupJqueryMPopups.screenLockerBackground,
				left: "0",
				top: "0",
				opacity: setupJqueryMPopups.screenLockerOpacity,
				display: "none"
			});
			showScreenLocker();

			$("#popupLayerScreenLocker").click(function() {
				$.closePopupLayer();
			});
		}
	}

	function hideScreenLocker(popupName) {
		if (openedPopups.length === 0) {
			screenlocker = false;
			$('#popupLayerScreenLocker').fadeOut();
		} else {
			$('#popupLayerScreenLocker').css("z-index", parseInt($("#popupLayer_" + openedPopups[openedPopups.length - 1].name).css("z-index"), 10) - 1);
		}

		if ($.browser.msie && $.browser.version < 7) {
			$("select.hidden-by-" + popupName).removeClass("hidden-by-jmp hidden-by-" + popupName).css("visibility", "visible");
		}
	}

	function setPopupLayersPosition(popupElement, animate) {
		if (popupElement) {
			if (popupElement.width() < $(window).width()) {
				var leftPosition = (document.documentElement.offsetWidth - popupElement.width()) / 2;
			} else {
				var leftPosition = document.documentElement.scrollLeft + 5;
			}

			if (popupElement.height() < $(window).height()) {
				var topPosition = document.documentElement.scrollTop + ($(window).height() - popupElement.height()) / 2;
			} else {
				var topPosition = document.documentElement.scrollTop + 5;
			}

			var positions = {
				left: leftPosition + "px",
				top: topPosition + "px"
			};

			if (!animate) {
				popupElement.css(positions);
			} else {
				popupElement.animate(positions, "normal");
			}

			setScreenLockerSize();
		} else {
			for (var i = 0; i < openedPopups.length; i++) {
				setPopupLayersPosition($("#popupLayer_" + openedPopups[i].name), true);
			}
		}
	}

	function showPopupLayerContent(popupObject, newElement, data) {
		var idElement = "popupLayer_" + popupObject.name;

		if (newElement) {
			showScreenLocker();

			$("body").append("<div id='" + idElement + "'><!-- --></div>");

			var zIndex = parseInt(openedPopups.length == 1 ? 1000 : $("#popupLayer_" + openedPopups[openedPopups.length - 2].name).css("z-index"), 10) + 2;
		} else {
			var zIndex = $("#" + idElement).css("z-index");
		}

		var popupElement = $("#" + idElement);

		popupElement.css({
			visibility: "hidden",
			width: popupObject.width == "auto" ? "" : popupObject.width + "px",
			height: popupObject.height == "auto" ? "" : popupObject.height + "px",
			position: "absolute",
			"z-index": zIndex
		});

		var linkAtTop = "<a href='#' class='jmp-link-at-top' style='position:absolute; left:-9999px; top:-1px;'>&nbsp;</a><input class='jmp-link-at-top' style='position:absolute; left:-9999px; top:-1px;' />";
		var linkAtBottom = "<a href='#' class='jmp-link-at-bottom' style='position:absolute; left:-9999px; bottom:-1px;'>&nbsp;</a><input class='jmp-link-at-bottom' style='position:absolute; left:-9999px; top:-1px;' />";

		popupElement.html(linkAtTop + data + linkAtBottom);

		setPopupLayersPosition(popupElement);

		popupElement.css("display", "none");
		popupElement.css("visibility", "visible");

		if (newElement) {
			popupElement.fadeIn();
		} else {
			popupElement.show();
		}

		$("#" + idElement + " .jmp-link-at-top, " +
		  "#" + idElement + " .jmp-link-at-bottom").focus(function() {
		  	$(focusableElement[focusableElement.length - 1]).focus();
		  });

		var jFocusableElements = $("#" + idElement + " a:visible:not(.jmp-link-at-top, .jmp-link-at-bottom), " +
								   "#" + idElement + " *:input:visible:not(.jmp-link-at-top, .jmp-link-at-bottom)");

		if (jFocusableElements.length === 0) {
			var linkInsidePopup = "<a href='#' class='jmp-link-inside-popup' style='position:absolute; left:-9999px;'>&nbsp;</a>";
			popupElement.find(".jmp-link-at-top").after(linkInsidePopup);
			focusableElement.push($(popupElement).find(".jmp-link-inside-popup")[0]);
		} else {
			jFocusableElements.each(function() {
				if (!$(this).hasClass("jmp-link-at-top") && !$(this).hasClass("jmp-link-at-bottom")) {
					focusableElement.push(this);
					return false;
				}
			});
		}

		$(focusableElement[focusableElement.length - 1]).focus();

		popupObject.success();

		if (popupObject.reloadSuccess) {
			popupObject.reloadSuccess();
			popupObject.reloadSuccess = null;
		}
	}

	function loadPopupLayerContent(popupObject, newElement) {
		if (newElement) {
			openedPopups.push(popupObject);
		}

		if (popupObject.target !== "") {
			showPopupLayerContent(popupObject, newElement, $("#" + popupObject.target).html());
		} else {
			$.ajax({
				url: popupObject.url,
				data: popupObject.parameters,
				cache: popupObject.cache,
				dataType: "html",
				method: "GET",
				success: function(data) {
					showPopupLayerContent(popupObject, newElement, data);
				},
				error: popupObject.error
			});
		}
	}

	$(window).resize(resizePopup);

	function resizePopup() {
		//Due to IE constantly firing resize events we are going to call the real resize functions from a timer
		//by clearing the timer and resetting it on every call to resizePopup we can ensure it only fires once 
		//after we have finished resizing and prevent animation queuing
		clearTimeout(resizingTimeoutID);
		resizingTimeoutID = setTimeout(function() {
			setScreenLockerSize();
			setPopupLayersPosition();
		}, 250);
	};

	$(document).keydown(function(e) {
		if (e.keyCode == 27) {
			$.closePopupLayer();
		}
	});

})(jQuery);