/*
 * AppGo使用的 图片查看插件
 * Author : lufeng@bingosoft.net
 * Version: 1.0.0
 * Date : 2015/11/17
 */
(function($) {

	var windowMargin = 8; // 加多边距的宽高，使得图片看起来有边框效果

	// 图片查看器
	$.fn.extend({

		photoGallery : function(options) {

			var isFirefox = navigator.userAgent.indexOf("Firefox") > -1;
			var MOUSEWHEEL_EVENT = isFirefox ? "DOMMouseScroll" : "mousewheel";
			var defaults = {
				// 图片缩放倍率
				ratio : 1.2,
				// 右下角缩略图宽度
				thumbnailsWidth : 180,
				// 右下角缩略图高度
				thumbnailsHeight : 120,
				// HTML模版
				template : {
					// 操作工具
					OPERTATION : '<div class="oper">' + '<span class="prev"><i class="icon_tool-prev"></i></span>' + '<span class="next"><i class="icon_tool-next"></i></span>' + '</div>' + '<div class="tool">' + '<div class="toolct">' + '<span class="oper_fullscreen" title="查看全屏"><i class="icon_tool-fullscreen"></i></span>' + '<span class="oper_bigger" title="放大图片"><i class="icon_tool-bigger"></i></span>' + '<span class="oper_smaller" title="缩小图片"><i class="icon_tool-smaller"></i></span>' + '<span class="oper_rotate" title="向右旋转"><i class="icon_tool-rotate"></i></span>' + '<span class="oper_download" title="关闭图片"><i class="icon_tool-download"></i></span>' + '</div>' + '</div>',
					// 缩略图
					THUMBNAILS : "<div class='thumbnails'>" + '<span class="thumbClose" title="关闭缩略图"><i class="icon_close-small"></i></span>' + '<img ondragstart="return false;"/>' + '<div class="thumbDrag"><span></span></div>' + "</div>",
					// 大图
					IMAGE : '<img class="image" ondragstart="return false;"/>'
				}
			};

			var o = $.extend(defaults, options), $gallery = $(this);
			$gallery.append(o.template.OPERTATION).append(o.template.THUMBNAILS);

			var $tool = $(this).find(".tool"), $fullscreen = $(this).find(".oper_fullscreen"), $bigger = $(this).find(".oper_bigger"), $smaller = $(this).find(".oper_smaller"), $rotate = $(this).find(".oper_rotate"), $download = $(this).find(".oper_download"), $prev = $(this).find(".prev"), $next = $(this).find(".next"), $thumbnails = $(this).find(".thumbnails"), $image, $thumbImg, imageWidth, imageHeight, imgRatio, dragX, dragY, cW, cH, w, h, isVertical, thumbX, thumbY;
			
			
			// 上一张
			$prev.on('click', function() {
				if (o.activeIndex > 0)
					o.activeIndex--;
				toggleImage();
			});

			// 下一张
			$next.on('click', function() {
				if (o.activeIndex < o.imgs.length - 1)
					o.activeIndex++;
				toggleImage();
			});

			// 缩略图
			$thumbnails.css({
				height : o.thumbnailsHeight,
				width : o.thumbnailsWidth
			}).on("mouseenter", function(e) {
				thumbX = -1;
			}).on("mousedown", function(e) {
				thumbX = e.pageX || e.clientX;
				thumbY = e.pageY || e.clientY;

				cW = document.body.clientWidth;
				cH = document.body.clientHeight;
				e.stopPropagation();
			}).on("mousemove", function(e) {
				if (thumbX > 0) {
					var nextDragX = e.pageX || e.clientX;
					var nextDragY = e.pageY || e.clientY;
					var $td = $(this).find(".thumbDrag"), imageWidth = $image.width(), imageHeight = $image.height(), thumbImgWidth = $thumbImg.width(), thumbImgHeight = $thumbImg.height(), left = parseFloat($td.css("left")) + (nextDragX - thumbX), top = parseFloat($td.css("top")) + (nextDragY - thumbY), w = $td.width(), h = $td.height(), it, il, maxL, maxT;

					if (isVertical) {
						thumbImgWidth = [ thumbImgHeight, thumbImgHeight = thumbImgWidth ][0];
						imageWidth = [ imageHeight, imageHeight = imageWidth ][0];
					}
					it = (o.thumbnailsHeight - thumbImgHeight) / 2, il = (o.thumbnailsWidth - thumbImgWidth) / 2, maxL = o.thumbnailsWidth - w - il - 2, // 减去2像素边框部分
					maxT = o.thumbnailsHeight - h - it - 2;

					if (left < il)
						left = il;
					else if (left > maxL)
						left = maxL;

					if (top < it)
						top = it;
					else if (top > maxT)
						top = maxT;

					$td.css({
						left : left,
						top : top
					})
					thumbX = nextDragX;
					thumbY = nextDragY;

					if (imageWidth < cW)
						left = (cW - imageWidth) / 2;
					else
						left = -imageWidth * (left - il) / thumbImgWidth;

					if (imageHeight < cH)
						top = (cH - imageHeight) / 2;
					else
						top = -imageHeight * (top - it) / thumbImgHeight;

					$image.offset({
						left : left,
						top : top
					});
				}
			}).on("mouseup", function(e) {
				thumbX = -1;
			});

			$thumbnails.find(".thumbClose").on("click", function() {
				$thumbnails.hide();
			});

			// 显示工具栏
			$gallery.on("mouseover", function(e) {
				$tool.show();

			}).on("mouseenter", function(e) {
				dragX = -1;
			}).on("mouseout", function(e) {
				$tool.hide();
			}).on("mousedown", function(e) {
				dragX = e.pageX || e.clientX;
				dragY = e.pageY || e.clientY;

				cW = document.body.clientWidth;
				cH = document.body.clientHeight;
				e.stopPropagation();
			}).on("mousemove", function(e) {
				if (dragX > 0) {
					var nextDragX = e.pageX || e.clientX;
					var nextDragY = e.pageY || e.clientY;
					var o = $image.offset(), left = o.left + (nextDragX - dragX), top = o.top + (nextDragY - dragY), w = $image.width(), h = $image.height();

					if (isVertical) {
						w = [ h, h = w ][0];
					}
					if (w > cW) {
						if (left > 0) {
							left = 0;
						} else if (left < cW - w) {
							left = cW - w;
						}
					} else {
						left = o.left;
					}
					if (h > cH) {
						if (top > 0) {
							top = 0;
						} else if (top < cH - h) {
							top = cH - h;
						}
					} else {
						top = o.top;
					}

					$image.offset({
						left : left,
						top : top
					});
					dragX = nextDragX;
					dragY = nextDragY;
					setThumbnails(); // 缩略图拖拽点
				}
			}).on("mouseup", function(e) {
				dragX = -1;
			});

			// 全屏
			var isMax, preWidth, preHeight, preTop, preLeft;
			$fullscreen.on("click", function() {
				var parentD = window.parent.document, J = $(parentD.getElementById("J_pg"));
				if (!isMax) {
					isMax = true;
					preWidth = document.body.clientWidth;
					preHeight = document.body.clientHeight;
					preTop = J.css("top");
					preLeft = J.css("left");
					J.css({
						top : 0,
						left : 0,
						width : parentD.body.clientWidth,
						height : parentD.body.clientHeight,
					});
				} else {
					isMax = false;
					J.css({
						top : preTop,
						left : preLeft,
						width : preWidth,
						height : preHeight
					});
				}
			});

			// 放大图片
			$bigger.on("click", function() {
				biggerImage();
			});

			// 缩小图片
			$smaller.on("click", function() {
				smallerImage();
			});

			// 旋转
			$rotate.on("click", function() {

				var rotateClass = $image.attr("class").match(/(rotate)(\d*)/);

				if (rotateClass) {
					var nextDeg = (rotateClass[2] * 1 + 90) % 360;
					$image.removeClass(rotateClass[0]).addClass("rotate" + nextDeg);
					$thumbImg.removeClass(rotateClass[0]).addClass("rotate" + nextDeg);
					resizeImage(nextDeg);
					resizeThumbImg(nextDeg);
					isVertical = nextDeg == 90 || nextDeg == 270;
				} else {
					$image.addClass("rotate90");
					$thumbImg.addClass("rotate90");
					resizeImage("90");
					resizeThumbImg("90");
					isVertical = true;
				}
			});

			// 下载
			$download.on("click", function() {
				var _parent = window.parent || window.top, _jg = _parent.document.getElementById("J_pg");
				$(_jg).remove();
			});

			$(window).on("resize", function() {
				setImagePosition();
			});

			if (document.attachEvent) {
				document.attachEvent("on" + MOUSEWHEEL_EVENT, function(e) {
					mouseWheelScroll(e);
				});
			} else if (document.addEventListener) {
				document.addEventListener(MOUSEWHEEL_EVENT, function(e) {
					mouseWheelScroll(e);
				}, true);
			}

			function mouseWheelScroll(e) {
				//var _delta = parseInt(e.wheelDelta || -e.detail);
				var _delta = Math.max(-1, Math.min(1, (e.wheelDelta || -e.detail)));
				//阻止向上冒泡
				//e.stopPropagation();
				e.preventDefault(); 
				// 向上滚动
				if (_delta > 0) {
					biggerImage();
				}
				// 向下滚动
				else {
					smallerImage();
				}
			}

			// 键盘左右键
			document.onkeydown = function(e) {
				e = e || window.event;
				if (e.keyCode) {
					if (e.keyCode == 37) { // left
						if (o.activeIndex > 0)
							o.activeIndex--;
						toggleImage();
					}
					if (e.keyCode == 39) { // right
						if (o.activeIndex < o.imgs.length - 1)
							o.activeIndex++;
						toggleImage();
					}
				}
			};

			document.onmouseup = function(oEvent) {
				if (!oEvent)
					oEvent = window.event;
				if (oEvent.button == 2) {
					var _parent = window.parent || window.top, _jg = _parent.document.getElementById("J_pg");
					$(_jg).remove();
				}
			}

			function init() {
				toggleImage();

				$(o.imgs).each(function(i, img) {
					$(o.template.IMAGE).appendTo($gallery).attr("src", img.url).attr("index", i).css({
						width : img.imgWidth,
						height : img.imgHeight,
						left : (cW - img.imgWidth) / 2,
						top : (cH - img.imgHeight) / 2
					}).on("dblclick", function() {

					});
					;
				});
				$image = $(".image[index='" + o.activeIndex + "']", $gallery).addClass("active");
			}

			function toggleImage() {
				imageWidth = o.imgs[o.activeIndex].imgWidth;
				imageHeight = o.imgs[o.activeIndex].imgHeight;
				imgRatio = imageWidth / imageHeight;
				cW = document.body.clientWidth;
				cH = document.body.clientHeight;
				$(".image", $gallery).removeClass("active");
				$image = $(".image[index='" + o.activeIndex + "']", $gallery).addClass("active").css({
					width : imageWidth,
					height : imageHeight
				}).removeClass("rotate0 rotate90 rotate180 rotate270");
				$thumbImg = $thumbnails.find("img").attr("src", o.imgs[o.activeIndex].url);
				$thumbnails.find("img").removeAttr("class").removeAttr("style");
				isVertical = false;
				$thumbnails.hide();
				$prev.addClass("active");
				$next.addClass("active");
				setImagePosition();
			}

			function biggerImage() {
				var w = $image.width(), h = $image.height(), nextW = w * o.ratio, nextH = h * o.ratio;
				if (nextW - w < 1)
					nextW = Math.ceil(nextW);
				var percent = (nextW / imageWidth * 100).toFixed(0);
				if (percent > 90 && percent < 110) {
					percent = 100;
					nextW = imageWidth;
					nextH = imageHeight;
				} else if (percent > 1600) {
					percent = 1600;
					nextW = imageWidth * 16;
					nextH = imageHeight * 16;
				}

				$image.width(nextW).height(nextH);
				setImagePosition();
				showPercentTip(percent);
				showThumbnails(nextW, nextH);
			}

			function smallerImage() {
				var w = $image.width(), h = $image.height(), nextW, nextH;
				var percent = (w / o.ratio / imageWidth * 100).toFixed(0);
				if (percent < 5) {
					percent = 5;
					nextW = imageWidth / 20;
					nextH = imageHeight / 20;
				} else if (percent > 90 && percent < 110) {
					percent = 100;
					nextW = imageWidth;
					nextH = imageHeight;
				} else {
					nextW = w / o.ratio;
					nextH = h / o.ratio;
				}

				$image.width(nextW).height(nextH);
				setImagePosition();
				showPercentTip(percent);
				showThumbnails(nextW, nextH);
			}

			// 显示缩略图
			function showThumbnails(width, height) {
				if (isVertical)
					width = [ height, height = width ][0];
				if (width > document.body.clientWidth || height > document.body.clientHeight) {
					$thumbnails.show();
					setThumbnails();
				} else {
					$thumbnails.hide();
				}
			}

			// 重置图片宽高
			function resizeImage(rotateDeg) {

				var mH = document.body.clientHeight - windowMargin, mW = document.body.clientWidth - windowMargin;
				if (rotateDeg == '90' || rotateDeg == '270') {
					mW = [ mH, mH = mW ][0];
				}

				var width, height;
				width = Math.min(imageWidth, mW);
				height = Math.min(imageHeight, mH);

				if (width / height > imgRatio) {
					width = height * imgRatio;
				} else {
					height = width / imgRatio;
				}

				$image.css({
					width : width,
					height : height
				});
				setImagePosition();
			}

			function resizeThumbImg(rotateDeg) {
				var maxW = o.thumbnailsWidth, maxH = o.thumbnailsHeight;
				if (rotateDeg == '90' || rotateDeg == '270') {
					maxW = [ maxH, maxH = maxW ][0];
				}
				$thumbImg.css({
					maxWidth : maxW,
					maxHeight : maxH
				});
				$thumbnails.hide();
			}

			// 显示百分比提示
			function showPercentTip(percent) {
				$gallery.find(".percentTip").remove();
				$("<div class='percentTip'><span>" + percent + "%</span></div>").appendTo($gallery).fadeOut(1500);
			}

			// 设置图片位置
			function setImagePosition() {
				var w = $image.width(), h = $image.height(), cW = document.body.clientWidth, cH = document.body.clientHeight;

				var left = (cW - w) / 2, top = (cH - h) / 2;

				$image.css("left", left + "px").css("top", top + "px");
			}

			// 设置缩略图拖拽区域
			function setThumbnails() {
				var $img = $thumbnails.find("img"), sW = $img.width(), sH = $img.height(), w = $image.width(), h = $image.height(), imf = $image.offset(), imfl = imf.left, imft = imf.top, cW = document.body.clientWidth, cH = document.body.clientHeight, tW, tH, tl, tt;

				if (isVertical) {
					sW = [ sH, sH = sW ][0];
					w = [ h, h = w ][0];
				}

				tW = sW / (w / cW);
				if (w < cW)
					tW = sW;
				tH = sH / (h / cH);
				if (h < cH)
					tH = sH;
				tl = (o.thumbnailsWidth - sW) / 2 + -imfl / w * sW;
				if (w < cW)
					tl = (o.thumbnailsWidth - sW) / 2;
				tt = (o.thumbnailsHeight - sH) / 2 + -imft / h * sH;
				if (h < cH)
					tt = (o.thumbnailsHeight - sH) / 2;
				$thumbnails.find(".thumbDrag").css({
					width : tW,
					height : tH,
					left : tl,
					top : tt
				});
			}

			init();
			return this;
		}
	});

	$.extend({
		// 打开图片查看器
		openPhotoGallery : function(obj) {

			var $img = $(obj), imgUrl = $img[0].src;
			if (!imgUrl)
				return;

			// HTML5提供了一个新属性naturalWidth/naturalHeight可以直接获取图片的原始宽高
			var img = $img[0], imgHeight = img.naturalHeight, imgWidth = img.naturalWidth, ratio = imgWidth / imgHeight, wH = 415, wW = 615, winHeight, winWidth, maxHeight = document.body.clientHeight - windowMargin * 2, maxWidth = document.body.clientWidth - windowMargin;

			winWidth = Math.max(wW, imgWidth);
			winHeight = Math.max(wH, imgHeight);

			if (winWidth > maxWidth) {
				winWidth = maxWidth;
				winHeight = Math.max(wH, Math.ceil(winWidth / ratio));
				if (imgWidth > winWidth) {
					imgWidth = winWidth;
					imgHeight = Math.ceil(imgWidth / ratio);
				}
			}

			if (winHeight > maxHeight) {
				winHeight = maxHeight;
				winWidth = Math.max(wW, Math.ceil(winHeight * ratio));
				if (imgHeight > winHeight) {
					imgHeight = winHeight;
					imgWidth = Math.ceil(imgHeight * ratio);
				}
			}

			var $gallerys = $(obj).closest(".gallerys"), activeIndex = 0, imgs = [];
			$(".gallery-pic").each(function(i, elem) {
				var url = this.src, img = $(this)[0], nH = img.naturalHeight, nW = img.naturalWidth, ratio = nW / nH, w = nW, h = nH;
				if (url == imgUrl) {
					activeIndex = i;
					w = imgWidth;
					h = imgHeight;
				} else {
					if (nW > winWidth) {
						w = winWidth;
						nH = h = Math.ceil(w / ratio);
						if (h > winHeight) {
							nH = h = winHeight;
							w = Math.ceil(h * ratio);
						}
					}
					if (nH > winHeight) {
						h = winHeight;
						w = Math.ceil(h * ratio);
						if (w > winWidth) {
							w = winWidth;
							h = Math.ceil(w / ratio);
						}
					}
				}
				imgs.push({
					url : url,
					imgHeight : h,
					imgWidth : w
				});
			});

			localStorage["photoGalleryImgs"] = JSON.stringify(imgs); // 因为此字符串可能是base64字符，appgo无法传
			localStorage["photoGalleryActiveIndex"] = activeIndex;

			$("#J_pg").remove();
			$("<iframe></iframe").appendTo("body").attr("id", "J_pg").attr("src", "lib/jquery-photo-gallery/gallery.html").css({
				position : "absolute",
				left : (document.body.clientWidth - winWidth) / 2,
				top : (document.body.clientHeight - winHeight) / 2 + $(window).scrollTop(),
				width : winWidth,
				height : winHeight,
				background : 'rgba(177, 178, 179, 1.0)',
				border : '1px solid #6D6D6D',
				'border-radius' : '4px',
				'z-index' : 9999
			});
		},
		// 做初始化
		initGallery : function() {

			var activeIndex = localStorage["photoGalleryActiveIndex"], imgs = JSON.parse(localStorage["photoGalleryImgs"]);

			localStorage.removeItem("photoGalleryActiveIndex");
			localStorage.removeItem("photoGalleryImgs");
			
			$("#mask").hide();

			$(".gallery").photoGallery({
				imgs : imgs,
				activeIndex : activeIndex
			});

			$(".closeWin").click(function() {
				var _parent = window.parent || window.top, _jg = _parent.document.getElementById("J_pg");

				$(_jg).remove();
			});
		}
	});

})(jQuery);