/*
* Tinh diem trung binh			
* Nguyen Hoang An - 06cntt2 - http://kushm.blogspot.com/ 	
*/
var 	maMonHK1 	= 	new Array(); // Ma mon hoc HK1
var 	tinChiHK1 = 	new Array(); // So tin chi HK1
var	diemHK1 	= 	new Array(); // Diem HK1

var 	maMonHK2 	= 	new Array(); // Ma mon hoc HK2
var 	tinChiHK2 = 	new Array(); // So tin chi HK2
var	diemHK2 	= 	new Array(); // Diem HK2

function getDetails(mon,loai){
	/*
	* - loai = 1 -> ma mon hoc
	* - loai = 3 -> ten mon hoc
	* - loai = 5 -> so tin chi
	* - loai = 7 -> diem
	*/
	if(loai == 1)
		return mon.childNodes[loai].innerHTML;
	else 
		return parseInt(mon.childNodes[loai].innerHTML);
}
function layThongTinHK(){
	/*
	* Lay thong tin cua tung mon: ma mon, so tin chi, diem
	*/
	var mon_H1 = document.getElementById("tb_HK1").getElementsByTagName("tr");
	var mon_H2 = document.getElementById("tb_HK2").getElementsByTagName("tr");
	var soMon_H1 = mon_H1.length;
	var soMon_H2 = mon_H2.length;
	for(i = 1; i< soMon_H1; i++){
		maMonHK1[i-1] 	= getDetails(mon_H1[i],1);
		tinChiHK1[i-1] = getDetails(mon_H1[i],5);
		diemHK1[i-1] 	= getDetails(mon_H1[i],7);
	}
	for(i = 1; i< soMon_H2; i++){
		maMonHK2[i-1] 	= getDetails(mon_H2[i],1);
		tinChiHK2[i-1] = getDetails(mon_H2[i],5);
		diemHK2[i-1] 	= getDetails(mon_H2[i],7);
	}
}

function tinhDiemHK1(){
	/*
	* Tinh diem hoc ky 1
	*/
	var tongDiem1 		= 0
	var tongDiemTL1	= 0;
	var tongTC1		= 0;
	var tongTCTL1		= 0;
	/*
	* Tinh diem trung binh hoc tap va tich luy trong hoc ky 2
	*/
	for(i = 0; i < diemHK1.length; i++){
		tongDiem1	+= diemHK1[i]*tinChiHK1[i];
		tongTC1 	+= tinChiHK1[i];
		if(diemHK1[i]){
			tongDiemTL1	+= diemHK1[i]*tinChiHK1[i];
			tongTCTL1	 	+= tinChiHK1[i];
		}	
	}
	// Trung binh hoc tap
	document.getElementById("tb1").innerHTML = tongDiem1/tongTC1;
	// So tin chi tich luy
	document.getElementById("tc1").innerHTML = tongTCTL1;
	// Trung binh tich luy
	document.getElementById("tbtl1").innerHTML = tongDiemTL1/tongTCTL1;
}
function isTrung(ma){
	/*
	* Kiem tra mon co trung hay khong
	*/
	var j;
	for(j = 0; j < maMonHK2.length; j++ ){
		if (ma == maMonHK2[j])
			return false;
	}
	return true;
}
function tinhDiemHK2(){
	/*
	* Tinh diem hoc ky 2
	*/
	var tongDiem2 		= 0
	var tongDiemTL2	= 0;
	var tongTC2		= 0;
	var tongTCTL2		= 0;
	/*
	* Tinh diem trung binh hoc tap va tich luy trong hoc ky 2
	*/
	for(i = 0; i < diemHK2.length; i++){
		tongDiem2	+= diemHK2[i]*tinChiHK2[i];
		tongTC2 	+= tinChiHK2[i];
		if(diemHK2[i]){
			tongDiemTL2	+= diemHK2[i]*tinChiHK2[i];
			tongTCTL2	 	+= tinChiHK2[i];
		}	
	}
	/*
	* Tinh diem tich luy trong hoc ky 1
	*/
	for(i = 0; i < maMonHK1.length; i++){
		if(isTrung(maMonHK1[i]) && diemHK1[i]){
			tongDiemTL2	+= diemHK1[i]*tinChiHK1[i];
			tongTCTL2	 	+= tinChiHK1[i];
		}

	}
	// Trung binh hoc tap
	document.getElementById("tb2").innerHTML = tongDiem2/tongTC2;
	// So tin chi tich luy
	document.getElementById("tc2").innerHTML = tongTCTL2;
	// Trung binh tich luy
	document.getElementById("tbtl2").innerHTML = tongDiemTL2/tongTCTL2;
}
function tinhDiem(){
	/*
	* Ham tinh toan diem
	*/
	layThongTinHK();
	tinhDiemHK1();
	tinhDiemHK2();	
}