/**
	 * index.php  JavaScript
	 *
	 * @since   2003/06/12
	 * @author  ShenTing Lin
	 * @version $Id: index.js,v 1.31.2.1 2007/07/18 03:36:34 edi Exp $
	 * @copyright 2003 SUNNET
	 **/
	function getTarget(m) {
		var obj = null;
		if (typeof(m) != 'undefined' && this.name == '') return self.s_catalog;
		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;
	}

	function getSysbar() {
		var obj = null;
		switch (this.name) {
			case "s_main"    :
			case "s_catalog" :
				obj = parent.s_sysbar;
				break;
			case "c_main"    :
			case "c_catalog" :
				obj = parent.c_sysbar;
				break;
			case "main"    :
			case "catalog" :
				obj = parent.sysbar;
				break;
		}
		return obj;
	}

	/**
	 * Change Tabs
	 * @param integer val : tabs id
	 * @return
	 **/
	function chgTabs(val) {
		var obj = document.getElementById("chgFm");
		if ((typeof(obj) == "object") && (obj != null)) {
			obj.tabs.value = val;
			window.onunload = function () {};
			obj.submit();
		}
	}

	/**
	 * reload Course Group tree
	 **/
	function resetTree() {
		var obj = null;
		var tabs = 0;

		obj = document.getElementById("chgFm");
		if ((typeof(obj) == "object") && (obj != null)) {
			tabs = parseInt(obj.tabs.value);
		}
		obj = getTarget();
		if ((typeof(obj) == "object") && (obj != null)) {
			if (typeof(obj.do_func) == "function") obj.do_func("list_group", tabs);
		}
	}

	/**
	 * reload index.php
	 **/
	function reloadSelf() {
		var obj = document.getElementById("gpFm");
		if ((typeof(obj) == "object") && (obj != null)) {
			window.onunload = function () {};
			obj.submit();
		}
	}

	/**
	 * change page
	 * @param integer n : action type or page number
	 * @return
	 **/
	function go_page(n){
		/*
		 * course name keyword
		*/
		var obj = null;
		var cour_key = "", teacher_key = "", en_begin = "", en_end = "", st_begin = "", st_end = "";
		obj  = document.getElementById("cour_keyword");
		if (obj != null) cour_key = obj.value;
		/*
		 * teacher name keyword
		*/
		obj  = document.getElementById("teacher");
		if (obj != null) teacher_key = obj.value;

		/*
		 * 報名日期(起) (enroll begin)
		*/
		obj  = document.getElementById("en_begin");
		if (obj != null) en_begin = obj.value;

		/*
		 * 報名日期(訖) (enroll end)
		*/
		obj  = document.getElementById("en_end");
		if (obj != null) en_end = obj.value;

		/*
		 * 上課日期(起) (study begin)
		*/
		obj  = document.getElementById("st_begin");
		if (obj != null) st_begin = obj.value;

		/*
		 * 上課日期(訖) (study end)
		*/
		var obj  = document.getElementById("st_end");
		var st_end = (obj != null) ? obj.value : "";

		obj  = document.getElementById("actFm");

		if ((typeof(obj) != "object") || (obj == null)) return '';
		obj.course_name.value = cour_key;
		obj.teacher.value = teacher_key;
		obj.en_begin.value = en_begin;
		obj.en_end.value = en_end;
		obj.st_begin.value = st_begin;
		obj.st_end.value = st_end;

		switch(n){
			case -1:	// 第一頁
				obj.page.value = 1;
				break;
			case -2:	// 前一頁
				obj.page.value = parseInt(obj.page.value) - 1;
				if (parseInt(obj.page.value) == 0) obj.page.value = 1;
				break;
			case -3:	// 後一頁
				obj.page.value = parseInt(obj.page.value) + 1;
				break;
			case -4:	// 最末頁
				obj.page.value = parseInt(total_page);
				break;
			default:	// 指定某頁
				obj.page.value = parseInt(n);
				break;
		}
		window.onunload = function () {};
		obj.submit();
	}

	/**
	 * show course detail info
	 * @param
	 * @return
	 **/
	function chgDetailStatus(val) {
		var obj = null;
		obj = document.getElementById("DetailTable");
		if (obj != null) obj.style.display = (val) ? "block" : "none";
		obj = document.getElementById("ListTable");
		if (obj != null) obj.style.display = (val) ? "none" : "block";
	}

	function showDetail(csid) {
		var obj = null, res = null;
		var idx = "";
		var enroll = new Array("", ""), study = new Array("", "");

		obj = getTarget(true);
		if ((obj == null) || (typeof(obj.do_func) != "function"))  return false;

		res = obj.do_func("detail", csid);
		for (var i in res) {
			switch (i) {
				case "enroll_begin":
					enroll[0] = (res[i].length <= 0) ? (MSG_FROM2+MSG_NOW) : (MSG_FROM2 + res[i]);
					break;
				case "enroll_end":
					enroll[1] = (res[i].length <= 0) ? (MSG_TO2+MSG_FOREVER) : MSG_TO2 + res[i];
					break;
				case "study_begin":
					study[0] = (res[i].length <= 0) ? (MSG_FROM2+MSG_NOW) : MSG_FROM2 + res[i];
					break;
				case "study_end":
					study[1] = (res[i].length <= 0) ? (MSG_TO2+MSG_FOREVER) : MSG_TO2 + res[i];
					break;

				default :
					obj = document.getElementById("cs_" + i);
					if (obj != null) obj.innerHTML = res[i];
			}
			//alert(i + " - " + res[i]);
		}

		obj = document.getElementById("cs_enroll");
		if (obj != null) obj.innerHTML = enroll.join("&nbsp;<br />&nbsp;");
		obj = document.getElementById("cs_study");
		if (obj != null) obj.innerHTML = study.join("&nbsp;<br />&nbsp;");

		// show course detail info
		chgDetailStatus(true);
	}

	/**
	 * close course detail info
	 **/
	function closeDetail() {
		chgDetailStatus(false);
	}

	/**
	 * add course to my favorite
	 * @param string csid : course id
	 **/
	function add_favorite(csid) {
		var obj = null;
		var res = 0;

		obj = getTarget();
		if ((obj == null) || (typeof(obj.do_func) != "function"))  return false;
		res = obj.do_func("add_favorite", csid);
		switch (parseInt(res)) {
			case 0 : alert(MSG_FAVORITE_SUCCESS); break;
			case 1 : alert(MSG_FAVORITE_FAIL); break;
			case 2 : alert(MSG_FAVORITE_EXIST); break;
			default:
				alert(MSG_FAVORITE_FAIL);
		}
	}

	/**
	 * 取得勾選的課程
	 **/
	function getCheckedCourse() {
		var nodes = null, attr = null, obj = null;
		var cnt = 0;
		var idx = new Array();

		nodes = document.getElementsByTagName("input");
		cnt = nodes.length;
		obj = getTarget();

		if ((obj == null) || (typeof(obj.objCkbox) != "object")) {
			for (var i = 0; i < cnt; i++) {
				if ((nodes[i].type == "checkbox") && nodes[i].checked && (nodes[i].value.length != 0)) {
					idx[idx.length] = nodes[i].value;
				}
			}
		} else {
			for (var i = 0; i < cnt; i++) {
				if ((nodes[i].type == "checkbox") && nodes[i].checked && (nodes[i].value.length != 0)) {
					idx[idx.length] = nodes[i].value;
					obj.objCkbox[nodes[i].value] = true;
				} else if (nodes[i].value.length != 0) {
					obj.objCkbox[nodes[i].value] = nodes[i].checked;
				}
			}
		}
		return idx;
	}

	/**
	 * reselect checkbox
	 **/
	function reCheckCourse() {
		var nodes = null, obj = null;
		var cnt = 0;
		var idx = new Array();

		nodes = document.getElementsByTagName("input");
		cnt = nodes.length;
		obj = getTarget();
		if ((obj == null) || (typeof(obj.objCkbox) != "object")) return false;
		for (var i = 0; i < cnt; i++) {
			if ((nodes[i].type == "checkbox") && obj.objCkbox[nodes[i].value]) {
				nodes[i].checked = true;
			}
		}
		chgCheckbox();
		return false;
	}

	function SelCourse(node) {
		var obj = null;

		obj = getTarget();
		if ((obj == null) || (typeof(obj.objCkbox) != "object")) return false;
		obj.objCkbox[node.value] = node.checked;
		chgCheckbox();
		return false;
	}

	function select_func(val) {
		// 這個應該不用到了 (not need)
		if (val) {
			do_func('sel_all');
		} else {
			do_func('sel_clean');
		}
	}

	function do_func(act) {
		var obj = null, nodes = null;
		var ary = new Array();

		switch (act) {
			case "major_add"   :
			case "major_del"   :
				nodes = getCheckedCourse();
				if (nodes.length <= 0) {
					alert(MSG_SEL_COURSE);
					return false;
				}

				obj = getTarget();
				if ((obj != null) && (typeof(obj.do_func) == "function")) {
					obj.do_func(act, nodes);
					return true;
				}
				alert(MSG_SYS_ERROR);
				break;

			case "major_reset" :
				obj = getTarget();
				if ((obj != null) && (typeof(obj.do_func) == "function")) {
					obj.do_func(act, "");
					reloadSelf();
					return true;
				}
				alert(MSG_SYS_ERROR);
			break;

			case "elective" :    // 送出選課清單 (submit elective list)
				nodes = document.getElementsByTagName("input");
				for (var i = 0; i < nodes.length; i++) {
					if ((nodes[i].type == "checkbox") && (nodes[i].value != "") && nodes[i].checked) {
						ary[ary.length] = nodes[i].value;
					}
				}
				obj = getTarget();
				if ((obj != null) && (typeof(obj.do_func) == "function")) {
					if (!obj.do_func(act, ary)) {
						return false;
					}
					// reloadSelf();
					if (this.name == 's_main' || this.name == 's_catalog')
					{
						obj = getSysbar();
						obj.updateCourseList();
					}
					chgTabs(6);
					return true;
				}
				break;

			case "sel_all" :
			case "sel_clean" :
				nodes = document.getElementsByTagName("input");
				if (nodes != null) {
					for (var i = 0; i < nodes.length; i++) {
						if (nodes[i].type == "checkbox")
							nodes[i].checked = (act == "sel_all") ? true : false;
					}
				}
				getCheckedCourse();
				break;

			case "append" :
			case "move" :
			case "delete" :
			case "up" :
			case "down" :
				nodes = getCheckedCourse();
				if (nodes.length <= 0) {
					alert(MSG_SRC_COURSE);
					return false;
				}

				obj = getTarget();
				if ((obj != null) && (typeof(obj.do_func) == "function"))
					obj.do_func(act, nodes);
				break;
		}
	}

	/**
	 * 切換全選或全消的 checkbox
	 * @version 1.0
	 **/
	function chgCheckbox() {
		var bol = true;
		var obj  = document.getElementById("ck");
		var btn1 = document.getElementById("btnSel1");
		var btn2 = document.getElementById("btnSel2");
		var nodes = document.getElementsByTagName("input");
		if ((nodes == null) || (nodes.length <= 0)) return false;
		var total_checkbox = 0;

		for (var i = 0; i < nodes.length; i++) {
			if ((nodes[i].type != "checkbox") || (nodes[i].id == "ck")) continue;
			if (nodes[i].checked == false) bol = false;
			if ((nodes[i].type == "checkbox") && (nodes[i].id != "ck")) total_checkbox++;
		}

		if (total_checkbox > 0){
			nowSel = bol;
		}else{
			bol = false;	// none course checkbox default false
		}
		if (obj  != null) obj.checked = bol;
		if (btn1 != null) btn1.value = bol ? MSG_SELECT_CANCEL : MSG_SELECT_ALL;
		if (btn2 != null) btn2.value = bol ? MSG_SELECT_CANCEL : MSG_SELECT_ALL;
		synBtn();
	}

	/**
	 * 同步全選或全消的按鈕與 checkbox
	 * @version 1.0
	 **/
	var nowSel = false;
	function selfunc() {
		var obj  = document.getElementById("ck");
		var btn1 = document.getElementById("btnSel1");
		var btn2 = document.getElementById("btnSel2");
		if ((obj == null) || (btn1 == null) || (btn2 == null)) return false;
		nowSel = !nowSel;
		obj.checked = nowSel;
		// alert(nowSel);
		btn1.value = nowSel ? MSG_SELECT_CANCEL : MSG_SELECT_ALL;
		btn2.value = nowSel ? MSG_SELECT_CANCEL : MSG_SELECT_ALL;
		// select_func(!nowSel);
		nowSel ? do_func("sel_all") : do_func("sel_clean");
		synBtn();
	}

	/**
	 * 同步按鈕的狀態
	 **/
	function synBtn() {
		var btn1 = document.getElementById("btnAdd1");
		var btn2 = document.getElementById("btnAdd2");
		var nodes = document.getElementsByTagName("input");
		if ((nodes == null) || (nodes.length <= 0)) return false;
		for (var i = 0, j = 0; i < nodes.length; i++) {
			if ((nodes[i].type != "checkbox") || (nodes[i].id == "ck")) continue;
			if (nodes[i].checked) j++;
		}
		if (btn1 != null) btn1.disabled = !(j > 0);
		if (btn2 != null) btn2.disabled = !(j > 0);
		var btn1 = document.getElementById("btnDel1");
		var btn2 = document.getElementById("btnDel2");
		if (btn1 != null) btn1.disabled = !(j > 0);
		if (btn2 != null) btn2.disabled = !(j > 0);
	}

	/*
	 * 去掉空格
	 */
	function trim(str){
 		if(str.charAt(0) == " "){
  			str = str.slice(1);
  			str = Trim(str);
 		}
 		return str;
	}

	/*
	 * 是否為潤年
	 */
	 function isLeapYear(year){
 		if((year%4==0&&year%100!=0)||(year%400==0)) {
 			return true;
 		}
 		return false;
	}

	/*
	 * 檢查日期是否合法
	 */
	function checkDate(val){
		var datetime;
		var year,month,day;
		var gone,gtwo;
		var date_reg = /^[0-9]{4,}\-[0-9]{2}\-[0-9]{2}$/;

		var datetime=trim(val);
		if(datetime.length > 0){

			if (datetime.search(date_reg) == -1){
   				return 1;
   			}

  			var temp = datetime.split('-');

			var year = parseInt(temp[0]);
			var month = parseInt(temp[1].replace(/^0/ig,''));
			var day = parseInt(temp[2]);

			if (year == 0){
				return 1;
			}
			if (day == 0){
				return 1;
			}
			if(month<1||month>12) {
   				return 2;
    		}
			if(month==2){
				if(isLeapYear(year)&&day>29){
   					return 3;
     			}
     			if(!isLeapYear(year)&&day>28){
   					return 4;
     			}
     		}

			if((month==1||month==3||month==5||month==7||month==8||month==10||month==12)&&(day>31)){
   				return 6;
    		}

			if((month==4||month==6||month==9||month==11)&&(day>30)){
				return 5;
   			}

		}
	}

	/**
	 * 加入課程名稱排序
	 *
	 **/
	 
	 function SortCourseName(val)
	 {
		// 加入課程名稱排序的條件
		obj = document.getElementById("CourseName_SORT");
		obj.value = val;
		queryCourse();
	 }
	
	/**
	 * 搜尋課程
	 *
	 **/
	function queryCourse() {
		var obj = null;
		// course name keyword
		obj = document.getElementById("cour_keyword");
		var cour_key = (obj == null) ? "" : obj.value;

		// teacher name keyword
		obj = document.getElementById("teacher");
		var teacher_key = (obj == null) ? "" : obj.value;

		// enroll date (begin)
		obj = document.getElementById("en_begin");
		var en_begin = (obj == null) ? "" : obj.value;

		// enroll date (end)
		obj = document.getElementById("en_end");
		var en_end = (obj == null) ? "" : obj.value;

		if ((en_begin != "") && (en_end != "")) {
			if (parseInt(en_begin.replace("-", "")) > parseInt(en_end.replace("-", ""))) {
				alert(MSG_ENROLL_DATE);
				return false;
			}
		}

		// study date (begin)
		obj = document.getElementById("st_begin");
		var st_begin = (obj == null) ? "" : obj.value;

		// study date (end)
		obj = document.getElementById("st_end");
		var st_end = (obj == null) ? "" : obj.value;

		if ((st_begin != "") && (st_end != "")) {
			if (parseInt(st_begin.replace("-", "")) > parseInt(st_end.replace("-", ""))) {
				alert(MSG_STUDY_DATE);
				return false;
			}
		}
		
		obj  = document.getElementById("actFm");
		obj.course_name.value = cour_key;
		obj.teacher.value = teacher_key;
		obj.en_begin.value = en_begin;
		obj.en_end.value = en_end;
		obj.st_begin.value = st_begin;
		obj.st_end.value = st_end;
		obj.advqy.value = (document.getElementById("QueryCond").style.display == "none") ? "hidden" : "visible";
		obj.isquery.value = "true";
		window.onunload = function () {};
		obj.submit();
	}

	/*
	 * 流程：首頁 -> 搜尋& 選課 -> 允許 guest -> 進入 [個人區 - 我的課程 - 全校課程]
	 *       選完課之後 -> 幫 user login -> 送出選課清單
	 */
	function login() {
		var obj = null, nodes = null;
		var ary = new Array();
		var loginDailog2 = null;

		nodes = getCheckedCourse();

		obj = getTarget();

		var obj = document.getElementById('course_ids');
		obj.value = nodes;

		if ((loginDailog2 != null) && !loginDailog2.closed) {
			loginDailog2.focus();
		} else {
			var rnd = Math.ceil(Math.random() * 100000);
			loginDailog2 = window.open("/learn/login.php", "win" + rnd, "top=250,left=350,width=300,height=150,toolbar=0,location=0,status=0,menubar=0,directories=0,resizable=1,scrollbar=1");
		}
	}

	window.onload = function () {
		var obj = null, obj1 = null, obj2 = null;
		var re = /\/learn\/mycourse\/course_tree\.php$/;

		obj = getTarget();
		if ((typeof(obj) == "object") && (obj != null)) {
			if (obj.location.href.match(re) == null) {
				obj.location.replace("course_tree.php");
			} else if (isTreeLoad) {
				resetTree();
			}
		}
		reCheckCourse();

		// display 2nd toolsbar
		obj1 = document.getElementById("tb1");
		obj2 = document.getElementById("tb2");
		if ((obj1 != null) && (obj2 != null))
			obj2.innerHTML = obj1.innerHTML;
		chgCheckbox();
	};

	window.onunload = function () {
		var obj = null;
		obj = getTarget();
		if ((typeof(obj) == "object") && (obj != null)) obj.location.replace("about:blank");
	};

	/**
	 * 目的 : 退選課程用function
	 * @param string act : 使用動作
	 * @param string course : 課程編號
	 *
	 * @return int result : (false,動作成功、true,動作失敗)
	 */
	
	function drop_elective(act,course) {
		obj = getTarget();
		if ((obj != null) && (typeof(obj.do_func) == "function")) {
		if (!obj.do_func(act, course)) {
			return false;
		}
			return true;
		}
	}