(function($) {

	$(function() {
		$.yuga.externalLink({
			blankIconPath: '<img src="/img/share/icon_blank.gif" alt="別窓で開きます" class="externalIcon" />',
			notWindowURL: 'a[href^="http://www.youtube.com/"],a[href^="http://ja.wikipedia.org/"]', //MTなどで別窓が開いてしまう対策
			blankIconHidden: '.no_exlink .externalIcon , #sub1 .externalIcon' //別窓アイコンを表示させたくない要素
		});
		$.yuga.scroll();
	});

	//---------------------------------------------------------------------

	$.yuga = {
		//外部リンクは別ウインドウを設定
		externalLink: function(options) {
			var c = $.extend({
				windowOpen:true,
				externalClass: 'externalLink',
				blankIconPath: '<img src="/img/item/icon_blank.gif" alt="別窓で開きます" class="externalIcon" />',
				notWindowURL: 'a[href^="http://example.com/"]',
				blankIconHidden: '#sub .externalIcon'
			}, options);
			var e = $('a[href^="http://"]').not(c.notWindowURL).append(c.blankIconPath);
			if (c.windowOpen) {
				e.click(function(){
					window.open(this.href, '_blank');
					return false;
				});
			}
			e.addClass(c.externalClass);
			$(c.blankIconHidden).css("display","none");
		},
		//ページ内リンクはするするスクロール
		scroll: function(options) {
			//ドキュメントのスクロールを制御するオブジェクト
			var scroller = (function() {
				var c = $.extend({
					easing:100,
					step:30,
					fps:60,
					fragment:''
				}, options);
				c.ms = Math.floor(1000/c.fps);
				var timerId;
				var param = {
					stepCount:0,
					startY:0,
					endY:0,
					lastY:0
				};
				//スクロール中に実行されるfunction
				function move() {
					if (param.stepCount == c.step) {
						//スクロール終了時
						setFragment(param.hrefdata.absolutePath);
						window.scrollTo(getCurrentX(), param.endY);
					} else if (param.lastY == getCurrentY()) {
						//通常スクロール時
						param.stepCount++;
						window.scrollTo(getCurrentX(), getEasingY());
						param.lastY = getEasingY();
						timerId = setTimeout(move, c.ms); 
					} else {
						//キャンセル発生
						if (getCurrentY()+getViewportHeight() == getDocumentHeight()) {
							//画面下のためスクロール終了
							setFragment(param.hrefdata.absolutePath);
						}
					}
				}
				function setFragment(path){
					location.href = path
				}
				function getCurrentY() {
					return document.body.scrollTop  || document.documentElement.scrollTop;
				}
				function getCurrentX() {
					return document.body.scrollLeft  || document.documentElement.scrollLeft;
				}
				function getDocumentHeight(){
					return document.documentElement.scrollHeight || document.body.scrollHeight;
				}
				function getViewportHeight(){
					return (!$.browser.safari && !$.browser.opera) ? document.documentElement.clientHeight || document.body.clientHeight || document.body.scrollHeight : window.innerHeight;
				}
				function getEasingY() {
					return Math.floor(getEasing(param.startY, param.endY, param.stepCount, c.step, c.easing));
				}
				function getEasing(start, end, stepCount, step, easing) {
					var s = stepCount / step;
					return (end - start) * (s + easing / (100 * Math.PI) * Math.sin(Math.PI * s)) + start;
				}
				return {
					set: function(options) {
						this.stop();
						if (options.startY == undefined) options.startY = getCurrentY();
						param = $.extend(param, options);
						param.lastY = param.startY;
						timerId = setTimeout(move, c.ms); 
					},
					stop: function(){
						clearTimeout(timerId);
						param.stepCount = 0;
					}
				};
			})();
			$('a[href^=#], area[href^=#]').not('a[href=#], area[href=#]').each(function(){
				this.hrefdata = new $.yuga.Uri(this.getAttribute('href'));
			}).click(function(){
				var target = $('#'+this.hrefdata.fragment);
				if (target.length == 0) target = $('a[name='+this.hrefdata.fragment+']');
				if (target.length) {
					scroller.set({
						endY: target.offset().top,
						hrefdata: this.hrefdata
					});
					return false;
				}
			});
		}
	};
})(jQuery);