//   #####################################################################
//
//                                W A R N I N G
//
//   This Javascript code is a copyright work. You do NOT have permission 
//   to copy, store, modify, reproduce, retransmit or distribute it. Your
//   download has been recorded and date-stamped by our web server, along
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//
//                English Forum is a public service website 
//                       http://www.english-forum.com
//                      Email: admin@english-forum.com
//
//     Irregular Verbs Quiz javascript (c) copyright 2001 Nikolay Babin
//     Website and javascript portions (c) copyright 2001 English Forum
//
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//   #####################################################################
//
//       English Forum modifications 25 Oct 2001 marked:  // # mod 10.01
// 
//   #####################################################################


function iw_cat(base,pasts, pastp, used, teststatus)
{
   this.base = base;
   this.pasts = pasts;
   this.pastp = pastp;
   this.active = 0;
   this.used = 0;
   this.teststatus = 0;
}

category_iw = new Array(
new iw_cat("awake", "awoke", "awoken", 0,0, 0),  
new iw_cat("be", "was,were", "been", 0,0, 0),
new iw_cat("beat", "beat", "beaten", 0,0, 0),
new iw_cat("become", "became", "become", 0,0, 0),
new iw_cat("begin", "began", "begun", 0,0, 0),
new iw_cat("bend", "bent", "bent", 0,0, 0),
new iw_cat("bet", "bet", "bet", 0,0, 0),
new iw_cat("bid", "bid", "bid", 0,0, 0),
new iw_cat("bite", "bit", "bitten", 0,0, 0),
new iw_cat("blow", "blew", "blown", 0,0, 0),
new iw_cat("break", "broke", "broken", 0,0, 0),
new iw_cat("bring", "brought", "brought", 0,0, 0),
new iw_cat("build", "built", "built", 0,0, 0),
new iw_cat("burn", "burned,burnt", "burned,burnt",0,  0, 0), 
new iw_cat("buy", "bought", "bought",  0,0, 0),
new iw_cat("catch", "caught", "caught",  0,0, 0),
new iw_cat("choose", "chose", "chosen",  0,0, 0),
new iw_cat("come", "came", "come",  0,0, 0),
new iw_cat("cost", "cost", "cost",  0,0, 0),
new iw_cat("cut", "cut", "cut",  0,0, 0),
new iw_cat("dig", "dug", "dug",  0,0, 0),
new iw_cat("do", "did", "done", 0,0, 0),
new iw_cat("draw", "drew", "drawn",  0,0, 0),
new iw_cat("dream", "dreamed,dreamt", "dreamed,dreamt", 0,0, 0), 
new iw_cat("drive", "drove", "driven", 0,0, 0),
new iw_cat("drink", "drank", "drunk", 0,0, 0),
new iw_cat("eat", "ate", "eaten",  0,0, 0),
new iw_cat("fall", "fell", "fallen",  0,0, 0),
new iw_cat("feel", "felt", "felt",  0,0, 0),
new iw_cat("fight", "fought", "fought",  0,0, 0),
new iw_cat("find", "found", "found", 0,0, 0),
new iw_cat("fly", "flew", "flown", 0,0, 0),
new iw_cat("forget", "forgot", "forgotten", 0,0, 0),
new iw_cat("forgive", "forgave", "forgiven", 0,0, 0),
new iw_cat("freeze", "froze", "frozen",  0,0, 0),
new iw_cat("get", "got", "got,gotten",  0,0, 0),
new iw_cat("give", "gave", "given",  0,0, 0),
new iw_cat("go", "went", "gone", 0,0, 0),
new iw_cat("grow", "grew", "grown",  0,0, 0),
new iw_cat("hang", "hung", "hung", 0,0, 0),
new iw_cat("have", "had", "had",  0,0, 0),
new iw_cat("hear", "heard", "heard",  0,0, 0),
new iw_cat("hide", "hid", "hidden",  0,0, 0),
new iw_cat("hit", "hit", "hit", 0,0, 0),
new iw_cat("hold", "held", "held",  0,0, 0),
new iw_cat("hurt", "hurt", "hurt", 0,0, 0),
new iw_cat("keep", "kept", "kept", 0,0, 0),
new iw_cat("know", "knew", "known",  0,0, 0),
new iw_cat("lay", "laid", "laid", 0,0, 0),
new iw_cat("lead", "led", "led",  0,0, 0),
new iw_cat("learn", "learned,learnt", "learned,learnt", 0,0, 0),
new iw_cat("leave", "left", "left", 0,0, 0),
new iw_cat("lend", "lent", "lent",  0,0, 0),
new iw_cat("let", "let", "let", 0,0, 0),
new iw_cat("lie", "lay", "lain", 0,0, 0),
new iw_cat("lose", "lost", "lost",  0,0, 0),
new iw_cat("make", "made", "made", 0,0, 0),
new iw_cat("mean", "meant", "meant",  0,0, 0),
new iw_cat("meet", "met", "met",  0,0, 0),
new iw_cat("pay", "paid", "paid", 0,0, 0),
new iw_cat("put", "put", "put",  0,0, 0),
new iw_cat("read", "read", "read", 0,0, 0),
new iw_cat("ride", "rode", "ridden",  0,0, 0),
new iw_cat("ring", "rang", "rung", 0,0, 0),
new iw_cat("rise", "rose", "risen",  0,0, 0),
new iw_cat("run", "ran", "run", 0,0, 0),
new iw_cat("say", "said", "said", 0,0, 0),
new iw_cat("see", "saw", "seen",  0,0, 0),
new iw_cat("sell", "sold", "sold",  0,0, 0),
new iw_cat("send", "sent", "sent", 0,0, 0),
new iw_cat("show", "showed", "showed,shown", 0,0, 0),
new iw_cat("shut", "shut", "shut",  0, 0,0),
new iw_cat("sing", "sang", "sung",  0,0, 0),
new iw_cat("sit", "sat", "sat",  0, 0,0),
new iw_cat("sleep", "slept", "slept",  0,0, 0),
new iw_cat("speak", "spoke", "spoken",  0, 0,0),
new iw_cat("spend", "spent", "spent", 0,0, 0),
new iw_cat("stand", "stood", "stood",  0,0, 0),
new iw_cat("swim", "swam", "swum",  0, 0,0),
new iw_cat("take", "took", "taken",  0, 0,0)               // # mod 10.01
);

var arrlength = category_iw.length;
var randomrun = false;
var testtype = 1;
function getnext()
{
	nextword= getnextword();
	if (nextword.base == null)
		return;
		
	var x = getRandom(3)
	document.form1.tBase.value = "";
	document.form1.tPastS.value = "";
	document.form1.tPastP.value = "";
	if (x == 1)
		document.form1.tBase.value = nextword.base;
	else if (x==2)
		document.form1.tPastS.value = nextword.pasts;
	else
		document.form1.tPastP.value = nextword.pastp;
}

function GetIW(st)
{
	if (document.form1.btnNext.value == " Start "){
		document.form1.btnNext.value = " Continue "
		getnext();
		return;
	}
	
	if (checkVal() == false)
			return;
	ValidateVal();
	curSel = curSel + 1;
	getnext();		
}

function ValidateVal()
{
	var val1 = document.form1.tBase.value
	val1 = NoSpace(val1);
	var val2 = document.form1.tPastS.value
	val2 = NoSpace(val2);
	var val3 = document.form1.tPastP.value
	val3 = NoSpace(val3);

	stval = true;
	if (val1 != category_iw[curSel].base) {
		stval= false;
	}else if (val2 != category_iw[curSel].pasts) {
		var commaPS = category_iw[curSel].pasts.indexOf(",");                     // # mod 10.01
		if (commaPS != -1) {                                                      // # mod 10.01
			var PS1 = category_iw[curSel].pasts.substring(0,commaPS);             // # mod 10.01
			var PS2 = category_iw[curSel].pasts.substring(commaPS+1);             // # mod 10.01
			var PS3 = PS2 + "," + PS1;                                            // # mod 10.01
			if ((val2 != PS1) && (val2 != PS2) && (val2 != PS3)) {stval= false}   // # mod 10.01
		}
		else {stval= false}
	}else if (val3 != category_iw[curSel].pastp) {
		var commaPP = category_iw[curSel].pastp.indexOf(",");                     // # mod 10.01
		if (commaPP != -1) {                                                      // # mod 10.01
			var PP1 = category_iw[curSel].pastp.substring(0,commaPP);             // # mod 10.01
			var PP2 = category_iw[curSel].pastp.substring(commaPP+1);             // # mod 10.01
			var PP3 = PP2 + "," + PP1;                                            // # mod 10.01
			if ((val3 != PP1) && (val3 != PP2) && (val3 != PP3)) {stval= false}   // # mod 10.01
		}
		else {stval= false;}
	}
	
	if (stval == false){
		category_iw[curSel].teststatus =  parseInt(category_iw[curSel].teststatus) - 1;
		window.setTimeout("displayStatus('r')", 50);
		alert("No, that's not correct!\nThe right answer is:\n\n     " + category_iw[curSel].base + "\n     " + category_iw[curSel].pasts + "\n     " + category_iw[curSel].pastp);   // # mod 10.01
		document.form1.tBase.focus();                                                                                                                                                 // # mod 10.01
	}else{
		category_iw[curSel].teststatus =  parseInt(category_iw[curSel].teststatus) + 1;
		window.setTimeout("displayStatus('c')", 50);
	}

}
function displayStatus(st)
{
	var str = "";
	var scoreval = 0;
	for (i=0;i < arrlength;i++)
		scoreval = scoreval + category_iw[i].teststatus;
	document.form1.tScore.value = scoreval;
	
	
	wordssel = getnumsel();
	document.form1.tReq.value = wordssel *  testtype;
}
function NoSpace(val)
{
	re = / /gi
	val = val.replace(re, "")
	return val;
}
function getRandom(n)
{
	var x = Math.random();
	x = parseInt(x*100)%n+1
	return x;
}
function checkVal()
{
	if (document.form1.tBase.value == ""){
		alert("Base Form is missing.")
		document.form1.tBase.focus();
		return false;
	}
	if (document.form1.tPastS.value == "") {
		alert("Past Simple is missing.")
		document.form1.tPastS.focus();
		return false;
	}
	if (document.form1.tPastP.value == ""){
		alert("Past Participle is missing.")
		document.form1.tPastP.focus();
		return false;
	}
	document.form1.tBase.focus();
	return 	true;
}
function resettest()
{
	document.form1.btnNext.value = " Start ";
	//document.form1.tScore.value = 0;
	//document.form1.tReq.value = 0;
	document.form1.tBase.value = "";
	document.form1.tPastS.value = "";
	document.form1.tPastP.value = "";
	var dropt =document.form1.drilltype;  
	testtype = dropt.options[dropt.selectedIndex].value;
	curSel = 0;
	for (i=0;i < arrlength;i++){
		category_iw[i].active = "0";
		category_iw[i].teststatus = 0;
	}
	var list =document.form1.testopt;  
	var val = list.options[list.selectedIndex].value;
	selected = val.split(String.fromCharCode(95))
	if (selected.length==2)
		setupwords(selected[0],selected[1])
	else
		setupwordsR(selected[0])
	GetIW(1);
	displayStatus('c');
	document.form1.tBase.focus();
}
function setupwords(startl, endl)
{
	randomrun = false;
	startl--;endl--;
	for (i=startl;i <= endl;i++)
		category_iw[i].active = '1';
}
function setupwordsR(num)
{
	randomrun = true;
	if (num == "00") {
		for (i=0;i < arrlength;i++)
			category_iw[i].active = '1';
		return;
	}

	for(k = 0; k < num ; k ++){
		var rundw = getRandom(arrlength);
		if (category_iw[rundw] == null) 
			rundw = 30;
		if (rundw >= arrlength)
			rundw = arrlength-1;
		
		if (category_iw[rundw].active == "1")
			rundw = getnotused (rundw);

		category_iw[rundw].active = "1";
	}
}
function getnotused(cur)
{
	for (i=cur;i < arrlength;i++)
		if (category_iw[i].active != "1")
			return i;
	for (i=0;i < arrlength;i++)
		if (category_iw[i].active != "1")
			return i;
	return cur;
}
function getnextword()
{
	if (randomrun == true){
		curSel = getRandom(arrlength);
	}
	if (curSel >=category_iw.length)
		curSel = 0;
	for (i=curSel;i < arrlength;i++){
		if (category_iw[i].teststatus < testtype)
			if (category_iw[i].active == 1){
				curSel = i;
				return category_iw[i];
			}
	}
	curSel = 0; //second run
	for (i=curSel;i < arrlength;i++){
		if (category_iw[i].teststatus < testtype)
			if (category_iw[i].active == 1){
				curSel = i;
				return category_iw[i];
			}
	}
	alert("Well done!  You've reached the Target Score.\n\nTo continue, select different verbs or another level.")   // # mod 10.01
	resettest();
	return "none";
}
function getnumsel()
{
var wordssel = 0;
for (j=0;j < arrlength;j++)
	if (category_iw[j].active == 1)
		wordssel++;

return wordssel;
}