/* @author Russ Tennant (russ@i2rd.com)
* @require i2rd-util.js
*/

if(typeof AC == 'undefined') {
	AC = {};
	AC.getElementsByTagName = function(tagName, start) {
	    if(!start){start = document;} // All variables are in function scope.
	    var elements = start.getElementsByTagName(tagName);
	    if(!elements || elements.length === 0){
	        elements = start.getElementsByTagName(tagName.toUpperCase());
		}
	    return elements;
	};
	AC.countWords = function(text) {
		var count = 0;
		if(text) {
			var list = text.split(/\s+/);
			for(var h = 0; h < list.length; h++) {
				if(!(list[h] == '')) {
					count++;
				}
			}
		}
		//log4js.logger.info("Found " + count + " words in: " + text);
		return count;
	};
	AC.Article = function(li, wpm) {
		this.article = li;
		var text = "";
		
		var components = AC.getElementsByTagName("div", li);
		for(var el = null, idx = 0; (el = components[idx]); idx++) {
			var cn = el.className || "";
			if(cn.match(/article_heading/)
	            || cn.match(/article_subheading/) 
	            || cn.match(/article_teaser/)
	            || cn.match(/article_post_time/)
	            || cn.match(/article_link_read_more/)
	            || cn.match(/article_byline/)
	            || cn.match(/article_content/)
	            ) {
				text = text + this.getText(el);
			} else if(cn != '') {
				log4js.logger.info("Unexpected component with classname: " + cn);
			}
		}
		this.wordCount = AC.countWords(text);
		// 100-200 WPM + acquire time
		wpm = wpm || 120.0;
		var t1 = (this.wordCount / wpm);
		t1 = Math.ceil(t1 * 60) * 1000; 
		this.minShowTime = t1 + 2000 /* Acquire Time */;
		//log4js.logger.info("ShowTime: " + this.minShowTime + " for " + li.id + ", wordcount = " + this.wordCount + ", WPM = " + wpm + ", t1 = " + t1);
	};
	AC.Article.prototype = {
		getRecommendedInterval : function() {
			return this.minShowTime;
		},
		show : function(cb) {
			var opacity = this.getOpacity();
			if(this.article.style.display != 'block') {
	            opacity = 0.0;
	            this.setOpacity(opacity);
				this.article.style.display = 'block';
			}
			if(opacity > 0.9) {
	            if(cb){cb.apply(this);}
			} else {
				opacity = opacity + 0.1;
				//log4js.logger.info("SHOW: Opacity is " + opacity);
				this.setOpacity(opacity);
				if(parseInt(opacity * 100) != parseInt(this.getOpacity() * 100)) {
					if(cb){cb.apply(this);}
				}
	            else
				    window.setTimeout(i2rd.bind(this.show, this, cb), 100);
			}
		},
		hide : function(cb) {
			var opacity = this.getOpacity();
			if(opacity < 0.1) {
	            if(cb){cb.apply(this);}
			} else {
				opacity = opacity - 0.1;
				//log4js.logger.info("HIDE: Opacity is " + opacity);
				this.setOpacity(opacity);
				if(parseInt(opacity * 100) != parseInt(this.getOpacity() * 100)) { // Check if we are spinning our wheels
					if(cb){cb.apply(this);}
				}
	            else
				    window.setTimeout(i2rd.bind(this.hide, this, cb), 100);
			}
		},
		getText : function(el) {
			if(!el){return el;}
			if (typeof el == "string"){return el;}
			var str = "", children = el.childNodes;
			var cn, i;
			for	(i = 0; (cn = children[i]); i++) {
				switch (cn.nodeType) {
					case 1:
						str += this.getText(cn);
						break;
					case 3:
						if(cn.nodeValue) {
							str += cn.nodeValue;
						} else if(str.length > 0 && str[str.length - 1] != "") {
							str += " ";
						}
						break;
				}
			}
			return str;
		},
		setOpacity : function(value) {
	        if (value >= 1) {
	          value = (/Gecko/.test(navigator.userAgent) &&
	            !/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0;
	          if(/MSIE [678]/.test(navigator.userAgent) && !window.opera) {
	            this.article.style.filter = this.article.style.filter.replace(/alpha\([^\)]*\)/gi,'');
	          }
	        } else {
	          if(value < 0.00001) value = 0;
	          if(/MSIE [678]/.test(navigator.userAgent) && !window.opera) {
	            this.article.style.filter = this.article.style.filter.replace(/alpha\([^\)]*\)/gi,'') +
	              'alpha(opacity='+ parseInt(value * 100) +')';
	           }
	        }
	        this.article.style.opacity = value;
		},
		getOpacity : function() {
			var value = this.article.style.opacity;
	        if(this.article.style.filter) {
	            value=/alpha\(opacity=([^\)]+)\)/gi.exec((this.article.style.filter||''));
	            if(value && value[1]) {value=parseFloat(value[1]) / 100.0;}
	        }	
			if(value) return parseFloat(value);
			return  this.article.style.filter ? 100 : 1.0;
		}
	};
	
	AC.RotatingHeadline = function(ol) {
		this.container = ol;
	    var articleContainer = ol.parentNode;
	    while (articleContainer && 
	        (articleContainer.className || "").toLowerCase().indexOf('articlecontainer') == -1) {
	        articleContainer = articleContainer.parentNode;
	    }
	    if(!articleContainer) {
	        log4js.logger.error("Unable to find article container.");
	        return;
	    }
	    var article, idx, el, lis = AC.getElementsByTagName("var", articleContainer), wpm = 95.0;
	    for (el = null, idx = 0; (el = lis[idx]); idx++) {
	        if (el.className == "wpm") {wpm = parseFloat(el.innerHTML+"");}
	    }    
		this.containerId = articleContainer.id;
		this.articles = [];
		this.paused = false;
		lis = AC.getElementsByTagName("li", ol);
	    if(lis.length <= 1) {return;}
		for(el = null, idx = 0; (el = lis[idx]); idx++) {
			article = new AC.Article(el, wpm);
			this.articles[this.articles.length] = article;
			article.article.style.display = 'none';
		}
	
		this.currentIdx = 0;
		i2rd.addEvent(ol, "mouseover", i2rd.bind(this.pause, this));
		i2rd.addEvent(ol, "mouseout", i2rd.bind(this.start, this));
		
		var startIdx = 0;
		if(this.containerId) {
			var articleId = i2rd.getCookie(this.containerId + "-la");
			for(var el = null, idx = 0; (el = lis[idx]); idx++) {
				var article = this.articles[idx];
				if(article.article.id == articleId) {
					startIdx = idx;
					break;
				}
			}
		}
		this.currentArticle = this.articles[startIdx];
		this.currentIdx = startIdx;
		this.currentArticle.show();
		//log4js.logger.info("Showing next article in " + this.currentArticle.getRecommendedInterval());
		window.setTimeout(i2rd.bind(this.showNextArticle, this), 
				this.currentArticle.getRecommendedInterval());
	};
	AC.RotatingHeadline.prototype = {
		pause : function() {
			this.paused = true;
		},
		start : function() {
			this.paused = false;
		},
		showNextArticle : function() {
			if(this.paused) {
				window.setTimeout(i2rd.bind(this.showNextArticle, this), 750);
				return;
			}
			this.prevArticle = null;
			this.currentIdx++;
			if(this.currentIdx >= this.articles.length) this.currentIdx = 0;
			if(this.currentIdx == 0) this.prevArticle = this.articles[this.articles.length - 1];
			else this.prevArticle = this.articles[this.currentIdx - 1];
			this.currentArticle = this.articles[this.currentIdx];
			//log4js.logger.info("showNextArticle. current = " + this.currentArticle.article.id 
			//	+ ", prev = " + this.prevArticle.article.id);
			this.prevArticle.hide(i2rd.bind(this.showNext, this));
			
			if(this.containerId) {
				var time = new Date();
				time.setHours(time.getHours() + 48);
				i2rd.setCookie(this.containerId + "-la", this.currentArticle.article.id, time);
			}
		},
		showNext : function(nextFunc) {
	        if(this.prevArticle)
	            this.prevArticle.article.style.display = 'none';
			this.currentArticle.show(i2rd.bind(this.startTimer, this));
		},
		startTimer : function() {
			window.setTimeout(i2rd.bind(this.showNextArticle, this), 
				this.currentArticle.getRecommendedInterval());
		}
	};
	
	AC.init = function(evt) {
	  // Find ac_style_stock_ticker
	  var lists = AC.getElementsByTagName("ol");
	  for(var el = null, idx = 0; (el = lists[idx]); idx++) {
	  	var cn = el.className || "";
	  	if(cn.match(/ac_style_rotating_headline/)) {
	  		new AC.RotatingHeadline(el);
	  	}
	  }
	};
	
	i2rd.addEvent(window, 'load', AC.init);
}