/*
 * jquery.powerFloat.js
 * jQuery 万能浮动层插件

 * http://www.zhangxinxu.com/wordpress/?p=1328
 * by zhangxinxu  
 * 2010-12-06 v1.0
 */
 
(function($) {
	$.fn.powerFloat = function(options) {
		return $(this).each(function() {
			var s = $.extend({}, defaults, options || {});
			var init = function(pms, trigger) {
				if (o.target && o.target.css("display") !== "none") {
					o.targetClear();
				}		
				o.s = pms;
				o.trigger = trigger;				
			};

			switch (s.eventType) {
				case "hover": {
					$(this).hover(function() {
						init(s, $(this));
						var numShowDelay = parseInt(s.showDelay, 10), hoverTimer;	
						//鼠标hover延时
						if (numShowDelay) {
							if (hoverTimer) {
								clearTimeout(hoverTimer);
							}
							hoverTimer = setTimeout(function() {
								o.targetGet();
							}, numShowDelay);	
						} else {
							o.targetGet();	
						}
					}, function() {
						o.flagDisplay = false;
						o.targetHold();
						if (s.hoverHold) {
							setTimeout(function() {
								o.displayDetect();	
							}, 200);
						} else {
							o.displayDetect();
						}
					});
					if (s.hoverFollow) {
						//鼠标跟随	
						$(this).mousemove(function(e) {
							o.cacheData.left = e.pageX;
							o.cacheData.top = e.pageY;
							o.targetGet();
							return false;
						});
					}
					break;	
				}
				case "click": {
					$(this).click(function(e) {
						if (o.flagDisplay && e.target === o.trigger.get(0)) {
							o.flagDisplay = false;	
							o.displayDetect();
							$(document).unbind("mouseup");
						} else {
							init(s, $(this));		
							o.targetGet();
							documentEventBind();
						}
					});
					var documentEventBind = function() {
						$(document).mouseup(function(e) {						
							if (s.eventType === "click" && o.flagDisplay === true && e.target != o.trigger.get(0) ) {
								var px = e.pageX, py = e.pageY, off = o.target.offset(), tarw = o.target.data("width") || o.target.outerWidth(), tarh = o.target.data("height") || o.target.outerHeight();	
								if (!(px > off.left && px < off.left + tarw && py > off.top && py < off.top + tarh)) {
									o.flagDisplay = false;	
									o.displayDetect();
									$(document).unbind("mouseup");
								}
							}
							return false;
						});
					};
					break;
				}
				case "focus": {
					$(this).focus(function() {
						init(s, $(this));
						o.targetGet();
					}).blur(function() {
						o.flagDisplay = false;
						setTimeout(function() {
							o.displayDetect();
						}, 200);
						
					});	
					break;
				}
				default: {
					init(s, $(this));
					o.targetGet();
					$(document).unbind("mouseup");
				}
			}
		});
	};
	
	var o = {
		targetGet: function() {
			//一切显示的触发来源
			if (!this.trigger) { return this; }
			var attr = this.trigger.attr(this.s.targetAttr), target = this.s.target;
			switch (this.s.targetMode) {
				case "common": {
					if (target) {
						var type = typeof(target);
						if (type === "object") {
							if (target.size()) {
								o.target = target.eq(0);
							}
						} else if (type === "string") {
							if ($(target).size()) {
								o.target = $(target).eq(0);
							}	
						}
					} else {
						if (attr && $("#" + attr).size()) {
							o.target = $("#" + attr);
						}
					}
					if (o.target) {
						o.targetShow();
					} else {
						return this;	
					}
					
					break;
				}
				case "ajax": {
					//ajax元素，如图片，页面地址
					var url = target || attr;
					this.targetProtect = false;
					
					if (/[\.jpg\.png\.gif\.bmp\.jpeg]$/i.test(url)) {
						if (o.cacheData[url]) {
							o.target = $(o.cacheData[url]);
							o.targetShow();
						} else {
							var tempImage = new Image();
							o.loading();
							tempImage.onload = function() {
								var w = tempImage.width, h = tempImage.height;
								var winw = $(window).width(), winh = $(window).height();
								var imgScale = w / h, winScale = winw / winh;
								if (imgScale > winScale) {
									//图片的宽高比大于显示屏幕
									if (w > winw / 2) {
										w = winw / 2;
										h = w / imgScale;	
									}
								} else {
									//图片高度较高
									if (h > winh / 2) {
										h = winh / 2;
										w = h * imgScale;
									}
								}
								var imgHtml = '<img class="float_ajax_image" src="' + url + '" width="' + w + '" height = "' + h + '" /><iframe style="position:absolute;top:0;left:0;;filter:alpha(opacity=0);"  width="' + w + '" height = "' + h + '"></iframe>';
								o.cacheData[url] = imgHtml;
								o.target = $(imgHtml);
								o.targetShow();
							};
							tempImage.onerror = function() {
								o.target = $('<div class="float_ajax_error">图片加载失败。</div>');
								o.targetShow();
							};
							tempImage.src = url;
						}
					} else {
						if (url) {
							if (o.cacheData[url]) {
								o.target = $('<div class="float_ajax_data">' + o.cacheData[url] + '</div>');
								o.targetShow();	
							} else {
								o.loading();
								$.ajax({
									url: url,
									success: function(data) {
										if (typeof(data) === "string") {
											o.target = $('<div class="float_ajax_data">' + data + '</div>');
											o.targetShow();
											o.cacheData[url] = data;
										}
									},
									error: function() {
										o.target = $('<div class="float_ajax_error">数据没有加载成功。</div>');
										o.targetShow();
									}
								});
							}
						}
					}
					break;
				}
				case "list": {
					//下拉列表
					var targetHtml = '<ul class="float_list_ul">',  arrLength;
					if ($.isArray(target) && (arrLength = target.length)) {
						$.each(target, function(i, obj) {
							var list = "", strClass = "", text, href;
							if (i === 0) {
								strClass = ' class="float_list_li_first"';
							}
							if (i === arrLength - 1) {
								strClass = ' class="float_list_li_last"';	
							}
							if (typeof(obj) === "object" && (text = obj.text.toString())) {
								if (href = obj.href.toString()) {
									list = '<a href="' + href + '" class="float_list_a">' + text + '</a>';	
								} else {
									list = text;	
								}
							} else if (typeof(obj) === "string" && obj) {
								list = obj;
							}
							if (list) {
								targetHtml += '<li' + strClass + '>' + list + '</li>';	
							}
						});
					} else {
						targetHtml += '<li class="float_list_null">列表无数据。</li>';	
					}
					targetHtml += '</ul>';
					o.target = $(targetHtml);
					this.targetProtect = false;	
					o.targetShow();	
					break;	
				}
				case "remind": {
					//内容均是字符串

					var strRemind = target || attr;
					this.targetProtect = false;	
					if (typeof(strRemind) === "string") {
						o.target = $('<span>' + strRemind + '</span>');
						o.targetShow();	
					}
					break;
				}
				default: {
					var objOther = target || attr, type = typeof(objOther);
					if (objOther) {
						if (type === "string") {
							//选择器

							if (/<.*>/.test(objOther)) {
								//纯粹字符串了
								o.target = $('<div>' + objOther + '</div>');
								this.targetProtect = false;
							} else if ($(objOther).size()) {
								o.target = $(objOther).eq(0);
								this.targetProtect = true;	
							} else if ($("#" + objOther).size()) {
								o.target = $("#" + objOther).eq(0);
								this.targetProtect = true;
							} else {
								o.target = $('<div>' + objOther + '</div>');
								this.targetProtect = false;		
							}
							o.targetShow();	
						} else if (type === "object") {
							if (!$.isArray(objOther) && objOther.size()) {
								o.target = objOther.eq(0);
								this.targetProtect = true;
								o.targetShow();	
							}
						}
					}
				}
			}
			return this;
		},
		container: function() {
			//容器(如果有)重装target
			var cont = this.s.container, mode = this.s.targetMode || "mode";
			if (mode === "ajax" || mode === "remind") {
				//显示三角
				this.s.sharpAngle = true;	
			} else {
				this.s.sharpAngle = false;
			}
			//是否反向
			if (this.s.reverseSharp) {
				this.s.sharpAngle = !this.s.sharpAngle;	
			}
			
			if (mode !== "common") {
				//common模式无新容器装载
				if (cont === null) {
					cont = "plugin";	
				} 
				if ( cont === "plugin" ) {
					if (!$("#floatBox_" + mode).size()) {
						$('<div id="floatBox_' + mode + '" class="float_' + mode + '_box"></div>').appendTo($("body")).hide();
					}
					cont = $("#floatBox_" + mode);	
				} 
				
				if (cont && typeof(cont) !== "string" && cont.size()) {
					if (this.targetProtect) {
						o.target.show().css("position", "static");
					}
					o.target = cont.empty().append(o.target);
				}
			}
			return this;
		},
		setWidth: function() {
			var w = this.s.width;
			if (w === "auto") {
				if (this.target.get(0).style.width) {
					this.target.css("width", "auto");	
				}
			} else if (w === "inherit") {
				this.target.width(this.trigger.width());
			} else {
				this.target.css("width", w);	
			}
			return this;
		},
		position: function() {
			var pos, tri_h = 0, tri_w = 0, cor_w = 0, cor_h = 0, tri_l, tri_t, tar_l, tar_t, cor_l, cor_t,
				tar_h = this.target.data("height"), tar_w = this.target.data("width"),
				st = $(window).scrollTop(),
				off_x = parseInt(this.s.offsets.x, 10) || 0, off_y = parseInt(this.s.offsets.y, 10) || 0,
				mousePos = this.cacheData;

			//缓存目标对象高度，宽度，提高鼠标跟随时显示性能，元素隐藏时缓存清除
			if (!tar_h) {
				tar_h = this.target.outerHeight();
				if (this.s.hoverFollow) {
					this.target.data("height", tar_h);
				}
			}
			if (!tar_w) {
				tar_w = this.target.outerWidth();
				if (this.s.hoverFollow) {
					this.target.data("width", tar_w);
				}
			}
			
			pos = this.trigger.offset();
			tri_h = this.trigger.outerHeight();
			tri_w = this.trigger.outerWidth();
			tri_l = pos.left;
			tri_t = pos.top;
			
			var funMouseL = function() {
				if (tri_l < 0) {
					tri_l = 0;
				} else if (tri_l + tri_h > $(window).width()) {
					tri_l = $(window).width() = tri_h;	
				}
			}, funMouseT = function() {
				if (tri_t < 0) {
					tri_t = 0;
				} else if (tri_t + tri_h > $(document).height()) {
					tri_t = $(document).height() - tri_h;
				}
			};
			//如果是鼠标跟随

			if (this.s.hoverFollow && mousePos.left && mousePos.top) {
				if (this.s.hoverFollow === "x") {
					//水平方向移动，说明纵坐标固定
					tri_l = mousePos.left
					funMouseL();
				} else if (this.s.hoverFollow === "y") {
					//垂直方向移动，说明横坐标固定，纵坐标跟随鼠标移动
					tri_t = mousePos.top;
					funMouseT();
				} else {
					tri_l = mousePos.left;
					tri_t = mousePos.top;
					funMouseL();
					funMouseT();
				}	
			}	
			
			
			var arrLegalPos = ["4-1", "1-4", "5-7", "2-3", "2-1", "6-8", "3-4", "4-3", "8-6", "1-2", "7-5", "3-2"],
				align = this.s.position, alignMatch = false, strDirect;
			$.each(arrLegalPos, function(i, n) {
				if (n === align) {
					alignMatch = true;	
					return;
				}
			});
			if (!alignMatch) {
				align = "4-1";
			}
			
			var funDirect = function(a) {
				var dir = "bottom";
				//确定方向
				switch (a) {
					case "1-4": case "5-7": case "2-3": {
						dir = "top";
						break;
					}
					case "2-1": case "6-8": case "3-4": {
						dir = "right";
						break;
					}
					case "1-2": case "8-6": case "4-3": {
						dir = "left";
						break;
					}
					case "4-1": case "7-5": case "3-2": {
						dir = "bottom";
						break;
					}
				}
				return dir;
			};
			
			var funJudge = function(dir) {
				var totalHeight = 0, totalWidth = 0, flagCorner = (o.s.sharpAngle && o.corner) ? true: false;
				if (dir === "right") {
					totalWidth = tri_l + tri_w + tar_w + off_x;
					if (flagCorner) {
						totalWidth += o.corner.width();
					}	
					if (totalWidth > $(window).width()) {
						return false;	
					}
				} else if (dir === "bottom") {
					totalHeight = tri_t + tri_h + tar_h + off_y;
					if (flagCorner) {
						totalHeight += 	o.corner.height();
					}
					if (totalHeight > st + $(window).height()) {
						return false;	
					}
				} else if (dir === "top") {
					totalHeight = tar_h + off_y;
					if (flagCorner) {
						totalHeight += 	o.corner.height();
					}
					if (totalHeight > tri_t - st) {
						return false;	
					} 
				} else if (dir === "left") {
					totalWidth = tar_w + off_x;
					if (flagCorner) {
						totalWidth += o.corner.width();
					}
					if (totalWidth > tri_l) {
						return false;	
					}
				}
				return true;
			};
			//此时的方向

			strDirect = funDirect(align);

			if (this.s.sharpAngle) {
				//创建尖角
				this.createSharp(strDirect);
			}
			
			//边缘过界判断
			if (this.s.edgeAdjust) {
				//根据位置是否溢出显示界面重新判定定位
				if (funJudge(strDirect)) {
					//该方向不溢出
					(function() {
						var obj = {
							top: {
								right: "2-3",
								left: "1-4"	
							},
							right: {
								top: "2-1",
								bottom: "3-4"
							},
							bottom: {
								right: "3-2",
								left: "4-1"	
							},
							left: {
								top: "1-2",
								bottom: "4-3"	
							}
						};
						var o = obj[strDirect], name;
						if (o) {
							for (name in o) {
								if (!funJudge(name)) {
									align = o[name];
								}
							}
						}
					})();
				} else {
					//该方向溢出

					(function() {
						var obj = {
							top: {
								left: "3-2",
								right: "4-1"	
							},
							right: {
								bottom: "1-2",
								top: "4-3"
							},
							bottom: {
								left: "2-3",
								right: "1-4"
							},
							left: {
								bottom: "2-1",
								top: "3-4"
							}
						};
						var o = obj[strDirect], arr = [];
						for (name in o) {
							arr.push(name);
						}
						if (funJudge(arr[0]) || !funJudge(arr[1])) {
							align = o[arr[0]];
						} else {
							align = o[arr[1]];	
						}
					})();
				}
			}
			
			//已确定的尖角
			var strNewDirect = funDirect(align), strFirst = align.split("-")[0];
			if (this.s.sharpAngle) {
				//创建尖角
				this.createSharp(strNewDirect);
				cor_w = this.corner.width(), cor_h = this.corner.height();
			}

			//确定left, top值

			if (this.s.hoverFollow) {
				//如果鼠标跟随
				if (this.s.hoverFollow === "x") {
					//仅水平方向跟随

					tar_l = tri_l + off_x;
					if (strFirst === "1" || strFirst === "8" || strFirst === "4" ) {
						//最左

						tar_l = tri_l - (tar_w - tri_w) / 2 + off_x;
					} else {
						//右侧
						tar_l = tri_l - (tar_w - tri_w) + off_x;
					}
					
					//这是垂直位置，固定不动

					if (strFirst === "1" || strFirst === "5" || strFirst === "2" ) {
						tar_t = tri_t - off_y - tar_h - cor_h;
						//尖角
						cor_t = tri_t - cor_h - off_y - 1;
						
					} else {
						//下方
						tar_t = tri_t + tri_h + off_y + cor_h;
						cor_t = tri_t + tri_h + off_y + 1;
					}
					cor_l = pos.left - (cor_w - tri_w) / 2;
				} else if (this.s.hoverFollow === "y") {
					//仅垂直方向跟随

					if (strFirst === "1" || strFirst === "5" || strFirst === "2" ) {
						//顶部
						tar_t = tri_t - (tar_h - tri_h) / 2 + off_y;
					} else {
						//底部
						tar_t = tri_t - (tar_h - tri_h) + off_y;
					}
							
					if (strFirst === "1" || strFirst === "8" || strFirst === "4" ) {
						//左侧
						tar_l = tri_l - tar_w - off_x - cor_w;
						cor_l = tri_l - cor_w - off_x - 1;
					} else {
						//右侧
						tar_l = tri_l + tri_w - off_x + cor_w;
						cor_l = tri_l + tri_w + off_x + 1;
					}
					cor_t = pos.top - (cor_h - tri_h) / 2;
				} else {
					tar_l = tri_l + off_x;
					tar_t = tri_t + off_y;	
				}
				
			} else {
				switch (strNewDirect) {
					case "top": {
						tar_t = tri_t - off_y - tar_h - cor_h;
						if (strFirst == "1") {
							tar_l = tri_l - off_x;	
						} else if (strFirst === "5") {
							tar_l = tri_l - (tar_w - tri_w) / 2 - off_x;
						} else {
							tar_l = tri_l - (tar_w - tri_w) - off_x;
						}
						cor_t = tri_t - cor_h - off_y - 1;
						cor_l = tri_l - (cor_w - tri_w) / 2;
						break;
					}
					case "right": {
						tar_l = tri_l + tri_w + off_x - cor_w;
						if (strFirst == "2") {
							tar_t = tri_t + off_y;	
						} else if (strFirst === "6") {
							tar_t = tri_t - (tar_h - tri_h) / 2 + off_y;
						} else {
							tar_t = tri_t - (tar_h - tri_h) + off_y;
						}
						cor_l = tri_l + tri_w + off_x;
						cor_t = tri_t - (cor_h - tri_h) / 2;
						break;
					}
					case "bottom": {
						tar_t = tri_t + tri_h + off_y + cor_h;
						if (strFirst == "4") {
							tar_l = tri_l + off_x;	
						} else if (strFirst === "7") {
							tar_l = tri_l - (tar_w - tri_w) / 2 + off_x;
						} else {
							tar_l = tri_l - (tar_w - tri_w) + off_x;
						}
						cor_t = tri_t + tri_h + off_y + 1;
						cor_l = tri_l - (cor_w - tri_w) / 2;
						break;
					}
					case "left": {
						tar_l = tri_l - tar_w - off_x - cor_w;
						if (strFirst == "2") {
							tar_t = tri_t - off_y;	
						} else if (strFirst === "6") {
							tar_t = tri_t - (tar_w - tri_w) / 2 - off_y;
						} else {
							tar_t = tri_t - (tar_h - tri_h) - off_y;
						}
						cor_l = tar_l + cor_w;
						cor_t = tri_t - (tar_w - cor_w) / 2;
						break;
					}
				}
			}
			//尖角的显示

			if (cor_h && cor_w && this.corner) {
				this.corner.css({
					left: cor_l,
					top: cor_t,
					zIndex: this.s.zIndex + 1	
				});
			}
			//浮动框显示

			this.target.css({
				position: "absolute",
				left: tar_l,
				top: tar_t,
				zIndex: this.s.zIndex
			});
			return this;
		},
		createSharp: function(dir) {
			var bgColor, bdColor, color1 = "", color2 = "";
			var objReverse = {
				left: "right",
				right: "left",
				bottom: "top",
				top: "bottom"	
			}, dirReverse = objReverse[dir] || "top";
			
			if (this.target) {
				bgColor = this.target.css("background-color");
				if (parseInt(this.target.css("border-" + dirReverse + "-width")) > 0) {
					bdColor = this.target.css("border-" + dirReverse + "-color");
				} 
				
				if (bdColor &&  bdColor !== "transparent") {
					color1 = 'style="color:' + bdColor + ';"';
				} else {
					color1 = 'style="display:none;"';
				}
				if (bgColor && bgColor !== "transparent") {
					color2 = 'style="color:' + bgColor + ';"';	
				}else {
					color2 = 'style="display:none;"';
				}
			}
			
			var html = '<div id="floatCorner_' + dir + '" class="float_corner float_corner_' + dir + '">' +
					'<span class="corner corner_1" ' + color1 + '>◆</span>' +
					'<span class="corner corner_2" ' + color2 + '>◆</span>' +
				'</div>';
			if (!$("#floatCorner_" + dir).size()) {
				$("body").append($(html));	
			}
			this.corner = $("#floatCorner_" + dir);
			return this;
		},
		targetHold: function() {
			if (this.s.hoverHold) {
				var delay = parseInt(this.s.hideDelay, 10) || 200;
				this.target.hover(function() {
					o.flagDisplay = true;
				}, function() {
					o.flagDisplay = false;
					//鼠标移出检测是否hover trigger，以决定其显示与否

					setTimeout(function() {
						o.displayDetect();	
					}, delay);
				});
			}
			return this;
		},
		loading: function() {
			this.target = $('<div class="float_loading"></div>');
			this.targetShow();
			this.target.removeData("width").removeData("height");
			return this;
		},
		displayDetect: function() {
			//显示与否检测与触发
			if (!this.flagDisplay) {
				this.targetHide();
			}
			return this;
		},
		targetShow: function() {
			o.cornerClear();
			this.flagDisplay = true;
			this.container().setWidth().position();
			this.target.show();
			if ($.isFunction(this.s.showCall)) {
				this.s.showCall.call(this.trigger, this.target);	
			}
			return this;
		},
		targetHide: function() {
			this.flagDisplay = false;
			this.targetClear();
			this.cornerClear();
			if ($.isFunction(this.s.hideCall)) {
				this.s.hideCall.call(this.trigger);	
			}
			this.target = null;
			this.trigger = null;
			this.s = {};
			this.targetProtect = false;
			return this;
		},
		targetClear: function() {
			if (this.target) {
				if (this.target.data("width")) {
					this.target.removeData("width").removeData("height");	
				}
				if (this.targetProtect) {
					//保护孩子
					this.target.children().hide().appendTo($("body"));
				} 
				this.target.unbind().hide();
			}
		},
		cornerClear: function() {
			if (this.corner) {
				//使用remove避免潜在的尖角颜色冲突问题

				this.corner.remove();
			}
		},
		target: null,
		trigger: null,
		s: {},
		cacheData: {},
		targetProtect: false
	};
	
	$.powerFloat = {};
	$.powerFloat.hide = function() {
		o.targetHide();	
	};
	
	var defaults  = {
		width: "auto", //可选参数：inherit，数值(px)
		offsets: {
			x: 0,
			y: 0	
		},
		zIndex: 999,
		
		eventType: "hover", //事件类型，其他可选参数有：click, focus
		
		showDelay: 0, //鼠标hover显示延迟
		hideDelay: 0, //鼠标移出隐藏延时
		
		hoverHold: true,
		hoverFollow: false, //true或是关键字x, y
		
		targetMode: "common", //浮动层的类型，其他可选参数有：ajax, list, remind
		target: null, //target对象获取来源，优先获取，如果为null，则从targetAttr中获取。

		targetAttr: "rel", //target对象获取来源，当targetMode为list时无效

		
		container: null, //转载target的容器，可以使用"plugin"关键字，则表示使用插件自带容器类型

		reverseSharp: false, //是否反向小三角的显示，默认ajax, remind是显示三角的，其他如list和自定义形式是不显示的

		
		position: "4-1", //trigger-target
		edgeAdjust: true, //边缘位置自动调整
		
		showCall: $.noop,
		hideCall: $.noop

	};
})(jQuery);