/*
	[Discuz!] (C)2001-2099 Comsenz Inc.
	This is NOT a freeware, use is subject to license terms

	$Id: autoloadpage.js 33246 2013-05-09 02:07:17Z kamichen $
*/

(function() {

	var autopbn = $('autopbn');
	var nextpageurl = autopbn.getAttribute('rel').valueOf();
	var curpage = parseInt(autopbn.getAttribute('curpage').valueOf());
	var totalpage = parseInt(autopbn.getAttribute('totalpage').valueOf());
	var picstyle = parseInt(autopbn.getAttribute('picstyle').valueOf());
	var forumdefstyle = parseInt(autopbn.getAttribute('forumdefstyle').valueOf());
	picstyle = picstyle && !forumdefstyle;
	var autopagenum = 0;
	var maxpage = (curpage + autopagenum) > totalpage ? totalpage : (curpage + autopagenum);

	var loadstatus = 0;

	autopbn.onclick = function() {
		var oldloadstatus = loadstatus;
		loadstatus = 2;
		autopbn.innerHTML = '正在加载, 请稍后...';
		getnextpagecontent();
		loadstatus = oldloadstatus;
	};

	if(autopagenum > 0) {
		window.onscroll = function () {
			var curtop = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
			if(curtop + document.documentElement.clientHeight + 500 >= document.documentElement.scrollHeight && !loadstatus) {
				loadstatus = 1;
				autopbn.innerHTML = '正在加载, 请稍后...';
				setTimeout(getnextpagecontent, 1000);
			}
		};
	}

	function getnextpagecontent() {

		if(curpage + 1 > totalpage) {
			window.onscroll = null;
			autopbn.style.display = 'none';
			return;
		}
		if(loadstatus != 2 && curpage + 1 > maxpage) {
			autopbn.innerHTML = '下一页 &raquo;';
			if(curpage + 1 > maxpage) {
				window.onscroll = null;
			}
			return;
		}
		curpage++;
		var url = nextpageurl + '&t=' + parseInt((+new Date()/1000)/(Math.random()*1000));
		var x = new Ajax('HTML');
		x.get(url, function (s) {
			s = s.replace(/\n|\r/g, ' ');
			if(s.indexOf("id=\"autopbn\"") == -1) {
				$("autopbn").style.display = "none";
				window.onscroll = null;
			}

			if(!picstyle) {
				var tableobj = $('threadlisttableid');
				var nexts = s.match(/\<tbody id="normalthread_(\d+)"\>(.+?)\<\/tbody>/g);
				for(i in nexts) {
					if(i == 'index' || i == 'lastIndex') {
						continue;
					}
					var insertid = nexts[i].match(/<tbody id="normalthread_(\d+)"\>/);
					if(!$('normalthread_' + insertid[1])) {

						var newbody = document.createElement('tbody');
						tableobj.appendChild(newbody);
						var div = document.createElement('div');
						div.innerHTML = '<table>' + nexts[i] + '</table>';
						tableobj.replaceChild(div.childNodes[0].childNodes[0], tableobj.lastChild);
					}
				}
			} else {
				var nexts = s.match(/\<li style="width:\d+px;" id="picstylethread_(\d+)"\>(.+?)\<\/li\>/g);
				for(i in nexts) {
					var insertid = nexts[i].match(/id="picstylethread_(\d+)"\>/);
					if(!$('picstylethread_' + insertid[1])) {
						$('threadlist_picstyle').innerHTML += nexts[i];
					}
				}
			}
			var pageinfo = s.match(/\<span id="fd_page_bottom"\>(.+?)\<\/span\>/);
			nextpageurl = nextpageurl.replace(/&page=\d+/, '&page=' + (curpage + 1));

			$('fd_page_bottom').innerHTML = pageinfo[1];
			var pageinfo = s.match(/\<span id="fd_page_top"\>(.+?)\<\/span\>/);
			$('fd_page_top').innerHTML = pageinfo[1];			
			autopbn.style.display = 'none';
			if (curpage + 1 <= totalpage) {
				autopbn.innerHTML = '下一页 &raquo;';
				setTimeout(function () {
					autopbn.style.display = 'block';
				}, 100);
			}
			loadstatus = 0;
		});
	}

})();