/**
 	 * 教材目錄
 	 *
 	 * @since   2003/06/05
 	 * @author  ShenTing Lin
 	 * @version $Id: course_tree.js,v 1.33 2006/04/20 08:55:25 wiseguy Exp $
 	 * @copyright 2003 SUNNET
 	 **/

	var isIE = false, isMZ = false;
	var bodyHeight = 0, bodyWidth = 0;
	var xmlVars = null, xmlHttp = null, xmlDocs = null;
	var objCkbox = new Object;
	var majorCourse = new Object;

 	function chkBrowser() {
		var re = new RegExp("MSIE","ig");
		if (re.test(navigator.userAgent)) {
			isIE = true;
		}

		re = new RegExp("Gecko","ig");
		if (re.test(navigator.userAgent)) {
			isMZ = true;
		}
	}

	/**
	 * 轉換 Html 的特殊字
	 * @param string str : 要轉換的字串
	 * @return string : 轉換後的字串
	 **/
	function htmlspecialchars(str) {
		var txt = "";
		if (str == "") return txt;
		txt = str.replace(/&/ig, "&");
		txt = txt.replace(/</ig, "&lt;");
		txt = txt.replace(/>/ig, "&gt;");
		txt = txt.replace(/'/ig, "&#039;");
		txt = txt.replace(/"/ig, "&quot;");
		return txt;
	}
///////////////////////////////////////////////////////////////////////////////
	function getTarget() {
		var obj = null;
		switch (this.name) {
			case "s_main": obj = parent.s_catalog; break;
			case "c_main": obj = parent.c_catalog; break;
			case "main"  : obj = parent.catalog;   break;
			case "s_catalog": obj = parent.s_main; break;
			case "c_catalog": obj = parent.c_main; break;
			case "catalog"  : obj = parent.main;   break;
		}
		return obj;
	}

	/**
	 * 取得節點的值
	 * @param object node : 要從哪個節點中取值
	 * @param string tag  : 節點中的哪個 tag
	 * @return string result : 取得的值。若無法取值，則回傳空字串
	 **/
	function getNodeValue(node, tag) {
		var childs = null;

		if ((typeof(node) != "object") || (node == null))
			return "";
		childs = node.getElementsByTagName(tag);
		if ((childs == null) || (childs.length <= 0)) return "";
		if (childs[0].hasChildNodes()) {
			return childs[0].firstChild.data;
		} else {
			return "";
		}
	}
///////////////////////////////////////////////////////////////////////////////

	var expandStatus = true;

	/**
	 * 顯示或隱藏 Frame
	 **/
	function winExpand(val) {
		var obj1 = document.getElementById("IconExpand");
		var obj2 = document.getElementById("IconCollection");
		var obj3 = document.getElementById("ToolBar");
		if ((obj1 == null) || (obj2 == null) || (obj3 == null))
			return false;

		expandStatus = val;
		if (val) {
			obj1.style.display = "none";
			obj2.style.display = "";
			obj3.style.visibility = "visible";
			if (obj2.offsetParent != null) obj2.offsetParent.style.padding = "6px 5px 0px 0px";
			parent.FrameExpand(1, true, '');
		} else {
			obj1.style.display = "";
			obj2.style.display = "none";
			obj3.style.visibility = "hidden";
			if (obj1.offsetParent != null) obj1.offsetParent.style.padding = "6px 0px 0px 0px";
			parent.FrameExpand(2, false, '20');
		}
		return false;
	}

	/**
	 * 展開或收攏群組
	 **/
	function gpExpand(val, indent) {
		var obj = document.getElementById("Group" + val);
		var icon = document.getElementById("Icon" + val);
		var attr = null;
		var txt = "";

		if (obj == null) return false;
		if (obj.style.display == "block") {
			obj.style.display = "none";
			if (icon != null) {
				icon.src = "/theme/" + theme + "/plus.gif";
				icon.alt = MSG_EXPAND;
				icon.title = MSG_EXPAND;
			}
		} else {
			if (icon != null) {
				icon.src = "/theme/" + theme + "/minus.gif";
				icon.alt = MSG_COLLECT;
				icon.title = MSG_COLLECT;
			}
			obj.style.display = "block";
			attr = obj.getAttribute("MyAttr");
			if ((attr != null) && (attr == "false")) {
				obj.innerHTML = MSG_LOADING;
				obj.setAttribute("MyAttr", "true");
				txt = buildGP(val, parseInt(indent));
				obj.innerHTML = txt;
				disableBubble();
			}
		}
		if (isIE) event.cancelBubble = true;
		return false;
	}

	/**
	 * cancel event bubble
	 * @param Event event
	 * @return
	 **/
	function eCancelBubble(evnt) {
		if (isMZ) {
			evnt.cancelBubble = true;
		} else if (isIE) {
			event.cancelBubble = true;
		}
	}

	/**
	 * run action
	 * @param object obj : object
	 * @param integer val : what event
	 * @return
	 **/
	var preIdx = '';
	function mouseEvent(obj, val) {
		var idx = 0;
		var node = null;
		if ((typeof(obj) != "object") || (obj == null)) return false;
		idx = obj.getAttribute("MyAttr");
		if (idx == preIdx) {
			if (parseInt(val) == 3) do_func("folder", idx);
			return false;
		}
		switch (parseInt(val)) {
			case 1 : obj.className = "cssTbFocus"; break;   // Mouse Over
			case 2 : obj.className = "cssTbBlur"; break;   // Mouse Out
			case 3 :    // Mouse Click
			case 4 :    // Mouse Click
				node = document.getElementById("Div" + preIdx);
				if (node != null) {
					node.className = "cssTbBlur";
				}
				obj.className = "cssTbFocus";
				preIdx = idx;
				if (parseInt(val) == 3) do_func("group", idx);
				break;
		}
	}
///////////////////////////////////////////////////////////////////////////////
	function searchPoint() {
		var nodes = null;
		nodes = document.getElementsByTagName("input");
		for (var i = 0; i < nodes.length; i++) {
			if ((nodes[i].type == "radio") && nodes[i].checked) {
				return nodes[i].value;
			}
		}
		return "";
	}

	function getGroupNode(gid) {
		var nodes = null, attr = null;
		if (gid == "root") return xmlDocs.documentElement;
		nodes = xmlDocs.getElementsByTagName("courses");
		if ((nodes == null) || (nodes.length <= 0)) return null;
		for (var i = 0; i < nodes.length; i++) {
			attr = nodes[i].getAttribute("id");
			if ((attr != null) && (attr == gid)) return nodes[i];
		}
		return null;
	}

	/**
	 * 建立子課程群組
	 * @param string  gid   : 課程群組的編號
	 * @param integer indent: 層級
	 * @return string result: 呈現課程目錄的結果
	 **/
	function buildGP(gid, indent) {
		var nodes = null, childs = null, node = null;
		var cnt = 0, idx = 0;
		var txt = "", result = "";

		node = getGroupNode(gid);
		if ((typeof(node) != "object") || (node == null)) return "";
		if (!node.hasChildNodes()) return "";
		nodes = node.childNodes;
		cnt = nodes.length;
		for (var i = 0; i < cnt; i++) {
			if (nodes[i].nodeType != 1) continue;
			if (nodes[i].nodeName == "courses") {
				idx = nodes[i].getAttribute("id");

				txt += '<table width="100%" border="0" cellspacing="0" cellpadding="0">';
				txt += '<tr><td nowrap>';
				// ident
				for (var j = (indent + 1); j > 0 ; j--)
					txt += '<pre style="width: 15px; display: inline;">&nbsp;&nbsp;</pre>';
				// icon
				childs = nodes[i].getElementsByTagName("courses");
				if ((childs != null) && (childs.length > 0))
					txt += '<img src="/theme/' + theme + '/plus.gif" width="9" height="15" border="0" align="absmiddle" alt="' + MSG_EXPAND + '" title="' + MSG_EXPAND + '" id="Icon' + idx + '" onclick="gpExpand(\'' + idx + '\', ' + (indent + 1) + ')">';
				else
					txt += '<img src="/theme/' + theme + '/dot.gif" width="9" height="15" border="0" align="absmiddle">';
				if (favorite) txt += '<input type="radio" name="actTarget[]" value="' + idx + '">';
				txt += '<span class="cssTbBlur" MyAttr="' + idx + '" id="Div' + idx + '" onmouseover="mouseEvent(this, 1)" onmouseout="mouseEvent(this, 2)" onclick="mouseEvent(this, 3)">';
				txt += htmlspecialchars(getCaption(nodes[i]));
				txt += '</span>';
				txt += '<div id="Group' + idx + '" MyAttr="false" style="display:none">' + result + '</div>';
				txt += '</td></tr>';
				txt += '</table>';
			}
		}
		return txt;
	}

	function disableBubble() {
		// 取消事件沸升 (Begin)
		if (isMZ) {
			nodes = document.getElementsByTagName("img");
			if (nodes == null) return false;
			cnt = nodes.length;
			for (var i = 0; i < cnt; i++) {
				if (nodes[i].getAttribute("id") != null) {
					nodes[i].addEventListener("click", eCancelBubble, false);
				}
			}   // End for (var i = 0; i < cnt; i++)
		}   // End if (isMZ)

		nodes = document.getElementsByTagName("input");
		if (nodes == null) return false;
		cnt = nodes.length;
		for (var i = 0; i < cnt; i++) {
			if (nodes[i].type == "radio") {
				nodes[i].onclick = eCancelBubble;
			}
		}   // End for (var i = 0; i < cnt; i++)
		// 取消事件沸升 (End)
	}

	/**
	 * 顯示課程群組
	 * @return
	 **/
	function showListFolder() {
		var obj = document.getElementById("CGroup");
		var nodes = null;
		var txt = "";

		if ((typeof(obj) != "object") || (obj == null)) return false;
		txt = buildGP("root", 0);
		obj.innerHTML = txt;
		disableBubble();
	}

	/**
	 * show all course
	 **/
	function showRoot() {
		var obj = null;
		obj = document.getElementById("Div" + preIdx);
		if (obj != null) {
			obj.className = "cssTbBlur";
		}
		preIdx = 10000000;
		do_func('group', 10000000);
	}
///////////////////////////////////////////////////////////////////////////////
	/**
	 * 重新定位物件的位置
	 **/
	function resetWin() {
		var obj = document.getElementById("ToolBar");
		if (obj == null) return false;
		bodyHeight = (isIE) ? document.body.clientHeight : window.innerHeight;
		bodyHeight = Math.max(parseInt(bodyHeight) - 30, 0);
		bodyWidth  = (isIE) ? document.body.clientWidth : window.innerWidth;
		bodyWidth  = Math.max(parseInt(bodyWidth) - 12, 0);

		obj.style.height = parseInt(bodyHeight);
		if (parseInt(bodyWidth) <= 30) {
			bodyWidth = 20;
			winExpand(false);
		}
		obj.style.width = bodyWidth;
		obj.firstChild.style.width = bodyWidth;
	}

	window.onresize = resetWin;

///////////////////////////////////////////////////////////////////////////////
	/**
	 * 控制台
	 * @param
	 * @return
	 **/
	function do_func(act, extra) {
		var obj = null, nodes = null, node = null;
		var txt = "";
		var res = 0;
		var csObj = null;

		if ((typeof(xmlHttp) != "object") || (xmlHttp == null)) xmlHttp = XmlHttp.create();
		if ((typeof(xmlVars) != "object") || (xmlVars == null)) xmlVars = XmlDocument.create();
		if ((typeof(xmlDocs) != "object") || (xmlDocs == null)) xmlDocs = XmlDocument.create();

		switch (act) {
			case "list_group" :
				objCkbox = new Object;
				majorCourse = new Object;

				if (parseInt(extra) >= 5) {
					window.onresize = function () {};
					parent.FrameExpand(0, false, '');
					return true;
				} else {
					//resetWin();
					window.onresize = resetWin;
					winExpand(expandStatus);
				}
				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "</manifest>";

				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				// alert(xmlHttp.responseText);
				res = xmlDocs.loadXML(xmlHttp.responseText);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				ticket = getNodeValue(xmlDocs.documentElement, "ticket");
				preIdx = 0;
				txt = "";
				switch (parseInt(extra)) {
					case 1 : txt = MSG_ALL_MAJOR;    break;
					case 2 : txt = MSG_ALL_TEACH;    break;
					case 3 : txt = MSG_ALL_SCHOOL;   break;
					case 4 : txt = MSG_ALL_FAVORITE; break;
				}
				obj = document.getElementById("allCSTitle");
				if (obj != null) obj.setAttribute("title", txt);
				if (parseInt(extra) == 4) {
					txt = "<a href=\"javascript:void(null);\" onclick=\"do_func('manage', ''); event.cancelBubble=true;\" class=\"cssAnchor\" title=\"" + MSG_ALT_EDFOLDER + "\">" + MSG_EDIT_FOLDER + "</a>";
					favorite = true;
				} else {
					txt = "";
					favorite = false;
				}
				obj = document.getElementById("editDir");
				if (obj != null) obj.innerHTML = '<br /><blockquote style="display: inline">' + txt + '</blockquote>';
				obj = document.getElementById("sname");
				if (obj != null) {
					obj.innerHTML = favorite ? '<input type="radio" value="10000000" name="actTarget[]">' + MSG_FAVORITE : MSG_SCHOOL_NAME;
				}
				showListFolder(); // display course group
				return true;
				break;

			case "group" :
				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "<group_id>" + extra + "</group_id>";
				txt += "</manifest>";

				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				// alert(xmlHttp.responseText);
				res = xmlVars.loadXML(xmlHttp.responseText);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				ticket = getNodeValue(xmlVars.documentElement, "ticket");
				// reload index.php
				obj = getTarget();
				if ((obj != null) && (typeof(obj.reloadSelf) == "function")) {
					obj.reloadSelf();
				}
				objCkbox = new Object;
				//majorCourse = new Object;
				break;

			case "favorite" : // show or hidden favorite
				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "</manifest>";

				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				// alert(xmlHttp.responseText);
				res = xmlVars.loadXML(xmlHttp.responseText);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				ticket = getNodeValue(xmlVars.documentElement, "ticket");
				break;

			case "add_favorite" : // add course to my favorite
				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "<course_id>" + parseInt(extra) + "</course_id>";
				txt += "</manifest>";

				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				//alert(xmlHttp.responseText);
				res = xmlVars.loadXML(xmlHttp.responseText);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				ticket = getNodeValue(xmlVars.documentElement, "ticket");
				res = getNodeValue(xmlVars.documentElement, "result");
				return parseInt(res);
				break;

			case "manage" : // Goto Favorite manage system
				obj = getTarget();
				if (obj != null) obj.location.replace("manage_folder.php");
				break;

			case "detail" : // get course detail info
				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "<course_id>" + parseInt(extra) + "</course_id>";
				txt += "</manifest>";

				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				// alert(xmlHttp.responseText);
				res = xmlVars.loadXML(xmlHttp.responseText);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				ticket = getNodeValue(xmlVars.documentElement, "ticket");
				csObj = new Object();
				nodes = xmlVars.getElementsByTagName("course");
				if ((nodes == null) || (nodes.length <= 0)) return null;
				node = nodes[0];
				nodes = node.childNodes;
				csObj['title'] = getCaption(node, 'title');
				for (var i = 0; i < nodes.length; i++) {
					if (nodes[i].nodeType != 1) continue;
					switch (nodes[i].nodeName) {
						case "title" : break;
						case "content_name" :
							csObj["content"] = getCaption(nodes[i], 'title');
							break;
						case "status" :
							txt = parseInt(getNodeValue(node, "status"));
							csObj["status"] = cs_status[txt];
							break;
						case "content":
							csObj["introduce"] = getNodeValue(node, nodes[i].nodeName);
							break;
						default :
							csObj[nodes[i].nodeName] = getNodeValue(node, nodes[i].nodeName);
					}
				}
				//csObj['title'] = getCaption(nodes[0]);
				return csObj;
				break;

			case "major_add" :
			case "major_del" :
				nodes = new Array();
				for (var i = 0; i < extra.length; i++) {
					if (!isNaN(parseInt(extra[i])) && (parseInt(extra[i]) > 10000000))
						nodes[nodes.length] = parseInt(extra[i]);
				}

				if (nodes.length == 0) {
					alert(MSG_SEL_COURSE);
					return false;
				}

				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "<course_id>" + nodes.toString() + "</course_id>";
				txt += "</manifest>";
				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				//alert(xmlHttp.responseText);
				res = xmlVars.loadXML(xmlHttp.responseText);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				ticket = getNodeValue(xmlVars.documentElement, "ticket");
				res = getNodeValue(xmlVars.documentElement, "result");
				txt = (act == "major_add") ? MSG_COURSE_ADD : MSG_COURSE_DEL;
				txt += (parseInt(res)) ? MSG_FAIL : MSG_SUCCESS;
				alert(txt);
				break;

			case "major_reset" :
				objCkbox = new Object;

				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "</manifest>";
				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				//alert(xmlHttp.responseText);
				res = xmlVars.loadXML(xmlHttp.responseText);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				ticket = getNodeValue(xmlVars.documentElement, "ticket");
				//res = getNodeValue(xmlVars.documentElement, "result");
				break;

			case "elective" :    // 送出選課清單 (submit elective list)
				nodes = new Array();
				for (var i = 0; i < extra.length; i++) {
					if (!isNaN(parseInt(extra[i])) && (parseInt(extra[i]) > 10000000))
						nodes[nodes.length] = parseInt(extra[i]);
				}

				if (nodes.length == 0) {
					alert(MSG_NO_ELECTIVE);
					return false;
				}

				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "<course_id>" + nodes.toString() + "</course_id>";
				txt += "</manifest>";
				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				// alert(xmlHttp.responseText);
				if (!xmlVars.loadXML(xmlHttp.responseText)) {
					alert(MSG_SYS_ERROR);
					// alert(xmlHttp.responseText);
					return false;
				}
				ticket = getNodeValue(xmlVars.documentElement, "ticket");
				res = getNodeValue(xmlVars.documentElement, "result");
				txt = (parseInt(res)) ? MSG_SEND_FAIL : MSG_SEND_SUCCESS;
				if ((parseInt(res))) alert(txt);
				break;
			case "drop_unelective": // 正式生退選未審核
			case "drop_elective" : //退選課程
				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "<course_id>" + parseInt(extra) + "</course_id>";
				txt += "</manifest>";

				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				//alert(xmlHttp.responseText);
				if (!xmlVars.loadXML(xmlHttp.responseText)) {
					alert(MSG_SYS_ERROR);
					// alert(xmlHttp.responseText);
					return false;
				}
				ticket = getNodeValue(xmlVars.documentElement, "ticket");
				res = getNodeValue(xmlVars.documentElement, "result");
				txt = (parseInt(res)) ? MSG_DROP_SUCCESS : MSG_DROP_FAIL;
				alert(txt);
				obj = getTarget();
				obj.reloadSelf();
				break;
			case "append" :
			case "move" :
				res = searchPoint();
				if (res == "") {
					alert(MSG_TARGET);
					return false;
				}
				if (res == preIdx) {
					alert(MSG_SAME_SRC_TGT);
					return false;
				}
				// 注意：這邊沒有 break (Note: This no break)

			case "delete" :
			case "up" :
			case "down" :
				if (!((act == "append") || (act == "move"))) res = "";
				txt  = "<manifest>";
				txt += "<ticket>" + ticket + "</ticket>";
				txt += "<action>" + act + "</action>";
				txt += "<group_id>" + res + "</group_id>";
				txt += "<course_id>" + extra.toString() + "</course_id>";
				txt += "</manifest>";

				res = xmlVars.loadXML(txt);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				xmlHttp.open("POST", "do_function.php", false);
				xmlHttp.send(xmlVars);
				//alert(xmlHttp.responseText);
				res = xmlVars.loadXML(xmlHttp.responseText);
				if (!res) {
					alert(MSG_SYS_ERROR);
					return false;
				}
				ticket = getNodeValue(xmlVars.documentElement, "ticket");
				res = getNodeValue(xmlVars.documentElement, "result");
				res = parseInt(res);
				obj = getTarget();
				if (res == 0) {
					// reload index.php
					if ((obj != null) && (typeof(obj.reloadSelf) == "function")) {
						obj.reloadSelf();
					}
				} else if (res < 0) {
					switch (act) {
						case "up"     : alert(MSG_NOT_MV_UP); break;
						case "down"   : alert(MSG_NOT_MV_DOWN); break;
						case "move"   :
						case "append" :
							if ((obj != null) && (typeof(obj.reloadSelf) == "function")) {
								obj.reloadSelf();
							}
							alert(MSG_SAME_COURSE);
							break;
						default:
					}
				}
				break;
		}
		return true;
	}