var obj=new Array(4);
var mousex=0, mousey=0;
var ready_for_a_new_trial="false";
var sentence1="";
var number1,number2,number3,number4;
var mishtaneezer;
var dontshow=false;
var score=0;
var targetnumber;
var tempnumber;
var wrong_answer_is_higher_timer=0;

var is_msie=navigator.userAgent.toLowerCase().indexOf('msie')>-1;
var is_firefox=navigator.userAgent.toLowerCase().indexOf('firefox')>-1;
var is_chrome=navigator.userAgent.toLowerCase().indexOf('chrome')>-1;

var delay=15;


pic1= new Image(1024,819); pic1.src="./rounding-spaceships_images/Earth.jpg"; 
pic2= new Image(90,37); pic2.src="../themes/space/spaceship1.gif"; 


//preload sounds
var aySound = new Array();
// Below: source for sound files to be preloaded
aySound[0]=new Image(); if(is_msie){aySound[0].src = "./../sounds/DingLing.wav"; } else {aySound[0].src = "./../sounds/DingLing.mp3"; }
aySound[1]=new Image(); if(is_msie){aySound[1].src = "./../sounds/Buzz01.wav"; } else {aySound[1].src = "./../sounds/Buzz01.mp3"; }


function set_width_of_screen(){

		//Get Window Width

		if (parseInt(navigator.appVersion)>3) {
		 if (navigator.appName=="Netscape") {
		  winW = window.innerWidth;
		  winH = window.innerHeight;
		 }
		 if (navigator.appName.indexOf("Microsoft")!=-1) {
		  winW = document.body.offsetWidth;
		  winH = document.body.offsetHeight;
		 }
		}

		var ad_left_limit=860;
		var ad_right_limit=1025;
		var ads_width=160;
		var str_ad="";
		winW-=5;

		if(winW<=1200){	str_ad="div_ad_vertical"; ads_width=160;} else {str_ad="div_ad_big"; ads_width=336;}

			if(winW<ad_left_limit+ads_width){document.getElementById(str_ad).style.left=ad_left_limit}  //setting the left limit of the ad location
			else {document.getElementById(str_ad).style.left=winW-ads_width;}  

			if(winW>ad_right_limit+ads_width) {document.getElementById(str_ad).style.left=ad_right_limit;} //setting the right limit of the ad location
		

		document.getElementById(str_ad).style.visibility="visible";
		document.getElementById(str_ad).style.display="";

}

var wait_timer=100;
var wait_timer_kivun=-1;

function wait_for_images_to_load(){

	if(pic1.complete&&pic2.complete){
		document.getElementById("div_pleasewait").style.visibility="hidden";
		init_main();
	}	else {	
			document.getElementById("div_pleasewait").style.visibility="visible";
			document.getElementById("div_btnrun").style.visibility="hidden";
			document.getElementById("div_pleasewait").style.filter = 'alpha(opacity=' + wait_timer + ')';
			document.getElementById("div_pleasewait").style.opacity=wait_timer/100;
		
			wait_timer+=wait_timer_kivun;
			if(wait_timer<=1){wait_timer_kivun=1}
			if(wait_timer>=100){wait_timer_kivun=-1}
			setTimeout('wait_for_images_to_load()',delay); 
		}
		
}


function init_main(){

	if(is_msie){auPreload();}


	document.onmousedown=handlemousedown;
	document.onmouseup=handlemouseup;
	document.getElementById("div_instructions").style.visibility="hidden";
	document.getElementById("div_imgthumb").style.visibility="hidden";
	document.getElementById("div_linkbacktomenu").style.visibility="hidden";
	document.getElementById("div_linkbacktomathgames").style.visibility="hidden";
	document.body.style.background="url('"+pic1.src+"') black top left no-repeat fixed"

	for ( var i=1; i<5; i++) {
		obj[i]=new obj_prototype();	
	}

	obj[1].y=60;	obj[2].y=150;	obj[3].y=250;	obj[4].y=350;

	init_this_task_variables();

	assign_divs_and_images_to_objects();	

	run_main_animation();

}

function init_this_task_variables(){


	for (var i4=1;i4<=4 ;i4++ )
	{	document.getElementById("div_spaceship"+i4).style.visibility="visible";
	}
	document.getElementById("div_targetnumber").style.visibility="visible";
	document.getElementById("div_btnrun").style.visibility="hidden";
	document.getElementById("div_exittomenu").style.visibility="visible";
	document.getElementById("div_score1").style.visibility="visible";

	set_numbers_to_spaceships();
}

         
function set_numbers_to_spaceships(){

	var repeatthis=true;
	var rand1,rand2,rand3,rand4;

	while (repeatthis==true) {

		rand1=Math.floor(Math.random()*10);
		rand2=Math.floor(Math.random()*10);
		rand3=Math.floor(Math.random()*10);
		rand4=Math.floor(Math.random()*8)+1;
		repeatthis=false;
	}

	targetnumber=rand1*1000+rand2*100+rand3*10+rand4;
	document.getElementById("txbx_score1").value=score;
	temprand=Math.floor(Math.random()*4);	

	if (temprand==0){

		if (rand4>=5)		{number1=rand1*1000+rand2*100+(rand3+1)*10		}  else {number1=rand1*1000+rand2*100+(rand3*10) }
		if (rand4<5)		{number2=rand1*1000+rand2*100+(rand3+1)*10		}  else {number2=rand1*1000+rand2*100+(rand3*10) }
		if (rand3>=5)		{number3=rand1*1000+(rand2+1)*100		}  else {number3=rand1*1000+rand2*100 }
		if (rand3<5)		{number4=rand1*1000+(rand2+1)*100		}  else {number4=rand1*1000+rand2*100 }

		if (number1==number2||number1==number3||number1==number4||number2==number3||number2==number4||number3==number4)		{ temprand=1}
	}

	if (temprand==1){

		if (rand4>=5)		{number1=rand1*1000+rand2*100+(rand3+1)*10		}  else {number1=rand1*1000+rand2*100+(rand3*10) }
		if (rand4<5)		{number2=rand1*1000+rand2*100+(rand3+1)*10		}  else {number2=rand1*1000+rand2*100+(rand3*10) }
		if (rand3>=5)		{number3=rand1*1000+(rand2+1)*100+rand4		}  else {number3=rand1*1000+rand2*100+rand4 }
		if (rand3<5)		{number4=rand1*1000+(rand2+1)*100+rand4		}  else {number4=rand1*1000+rand2*100+rand4 }

		if (number1==number2||number1==number3||number1==number4||number2==number3||number2==number4||number3==number4)		{ temprand=2}
	}

	if (temprand==2){

		if (rand4>=5)		{number1=rand1*1000+rand2*100+(rand3+1)*10		}  else {number1=rand1*1000+rand2*100+(rand3*10) }
		if (rand4<5)		{number2=rand1*1000+rand2*100+(rand3+1)*10		}  else {number2=rand1*1000+rand2*100+(rand3*10) }
		if (rand4>=5)		{number3=rand1*1000+rand2*100+100+(rand3+1)*10		}  else {number3=rand1*1000+rand2*100-100+(rand3*10) }
		if (rand4<5)		{number4=rand1*1000+rand2*100+100+(rand3+1)*10		}  else {number4=rand1*1000+rand2*100-100+(rand3*10) }

		if (number1==number2||number1==number3||number1==number4||number2==number3||number2==number4||number3==number4)		{ temprand=3}
	}

	if (temprand==3){

		if (rand4>=5)		{number1=rand1*1000+rand2*100+(rand3+1)*10		}  else {number1=rand1*1000+rand2*100+(rand3*10) }
		if (rand4<5)		{number2=rand1*1000+rand2*100+(rand3+1)*10		}  else {number2=rand1*1000+rand2*100+(rand3*10) }
		if (rand4>=5)		{number3=rand1*1000+rand2*100+(rand3+2)*10		}  else {number3=rand1*1000+rand2*100+((rand3-1)*10) }
		if (rand4<5)		{number4=rand1*1000+rand2*100+(rand3+2)*10		}  else {number4=rand1*1000+rand2*100+((rand3-1)*10) }

	}

for (var i3=0;i3<=30 ;i3++ ){	
	temprand=Math.floor(Math.random()*4);	
		if (temprand==0)		{tempnumber=obj[1].y;	obj[1].y=obj[2].y;	obj[2].y=tempnumber;}
		if (temprand==1)		{tempnumber=obj[2].y;	obj[2].y=obj[3].y;	obj[3].y=tempnumber;}
		if (temprand==2)		{tempnumber=obj[3].y;	obj[3].y=obj[4].y;	obj[4].y=tempnumber;}
		if (temprand==3)		{tempnumber=obj[4].y;	obj[4].y=obj[1].y;	obj[1].y=tempnumber;}
}

	obj[1].istarget=true;
	obj[2].istarget=false;
	obj[3].istarget=false;
	obj[4].istarget=false;


	document.getElementById("txbx_number1").value=number1;
	document.getElementById("txbx_number2").value=number2;
	document.getElementById("txbx_number3").value=number3;
	document.getElementById("txbx_number4").value=number4;

	sentence1=" Round this number to the nearest ten: "+targetnumber;
	document.getElementById("txbx_targetnumber").value=sentence1;	
}

function assign_divs_and_images_to_objects(){ 

		for (var i=1;i<=4 ;i++ )
		{

			document.getElementById("div_spaceship"+i).style.left=obj[i].x;
			document.getElementById("div_spaceship"+i).style.top=obj[i].y;
			document.getElementById("img_spaceship"+i).style.width=obj[i].sizex;
			document.getElementById("img_spaceship"+i).style.height=obj[i].sizey;
			document.getElementById("div_number"+i).style.left=obj[i].x+obj[i].xnumber;
			document.getElementById("div_number"+i).style.top=obj[i].y+obj[i].ynumber;
		}
}

function set_locations_to_spaceships(){

	for (var i1=1; i1<5; i1++){
		obj[i1].x=Math.floor(Math.random()*300+250);
		obj[i1].animationstage=0;
		obj[i1].timer1=100;

	}
}

function obj_prototype(){

	this.x=Math.floor(Math.random()*300+250);
	this.y=Math.floor(Math.random()*400+10);
	this.xnumber=20;
	this.ynumber=32;
	this.movex=1;
	this.movey=0;
	this.istarget=false;
	this.animationstage=0;
	this.timer1=100;
	this.moveacceleration=0;
	this.sizex=90;
	this.sizey=37;

}


function run_main_animation(){

	for (var i=1; i<5; i++){

		if (obj[i].animationstage==0){

			if (dontshow==false) document.getElementById("div_number"+i).style.visibility="visible";

			if (obj[i].timer1>0) {
				
				obj[i].timer1=obj[i].timer1-0.5;
				mishtaneezer=100-obj[i].timer1;
				document.getElementById("div_spaceship"+i).style.filter = 'alpha(opacity=' + mishtaneezer + ')';
				document.getElementById("div_number"+i).style.filter = 'alpha(opacity=' + mishtaneezer + ')';
				document.getElementById("div_spaceship"+i).style.opacity=mishtaneezer/100;
				document.getElementById("div_number"+i).style.opacity=mishtaneezer/100;


				if (obj[i].timer1<95) dontshow=false;  //this is to show the spaceships and numbers in their new locations only after set their opacity to transparent.

			} else {
				obj[i].timer1=0;
				obj[i].animationstage=1;
				}

		}


		if (obj[i].animationstage==1){

			obj[i].x=obj[i].x+obj[i].movex;
		
			if (obj[i].x>=650||obj[i].x<=40) obj[i].movex=obj[i].movex*(-1);


			temprand=Math.floor(Math.random()*60);
			if (temprand==1) {obj[i].movex=obj[i].movex+0.3}
			if (temprand==2) {obj[i].movex=obj[i].movex-0.3}
			
			if (obj[i].movex>1.5) obj[i].movex=1.5;
			if (obj[i].movex<-1.5) obj[i].movex=-1.5;

			temprand=Math.floor(Math.random()*20);
			if (Math.random()*20>19) {obj[i].y=obj[i].y-1} 
			else {if (Math.random()*20>19) {obj[i].y=obj[i].y+1} }
			if (obj[i].y<50) obj[i].y=50;

		}

		if (obj[i].animationstage==2){
			obj[i].movey=-2.5;
			obj[i].moveacceleration=0.05;

		for (var i4=1;i4<=4 ;i4++ )
		{	document.getElementById("div_number"+i4).style.visibility="hidden";
		}

			obj[i].animationstage=21;
			
			document.getElementById("div_spaceship"+i).style.zIndex="0";
		}

		if (obj[i].animationstage==21){    			//animating the spacship landing
			obj[i].moveacceleration=obj[i].moveacceleration*1.01;
			obj[i].movey=obj[i].movey+obj[i].moveacceleration;
			obj[i].y=obj[i].y+obj[i].movey/1.5;
			obj[i].sizex=obj[i].sizex+obj[i].movey/1.5; // if (obj[i].sizex<20) obj[i].sizex=20;
			obj[i].sizey=obj[i].sizey+obj[i].movey/4; //if (obj[i].sizey<10) obj[i].sizey=10;


			if (obj[i].movey>20) {				//bringing everything back to normal, and starting new values and locations

				score=score+1; 
				document.getElementById("txbx_score1").value=score;

				for (i2=1; i2<5; i2++){
					dontshow=true;
					obj[1].y=60;	obj[2].y=150;	obj[3].y=250;	obj[4].y=350;
					set_numbers_to_spaceships();					
					set_locations_to_spaceships();

					obj[i2].animationstage=0;
					obj[i2].movey=0;
					obj[i2].moveacceleration=0;

					obj[i2].sizex=90;
					obj[i2].sizey=37;

				}

				if (score%20==0){
					for (i2=1; i2<5; i2++){
						obj[i2].animationstage=3;
					}

				document.getElementById("div_btncontinue").style.visibility="visible";	
				document.getElementById("div_btnrestart").style.visibility="visible";	
				document.getElementById("div_btnbacktomenu").style.visibility="visible";	
				document.getElementById("div_exittomenu").style.visibility="hidden";	

				document.getElementById("div_targetnumber").style.visibility="hidden";	

				sentence1="Great job! You sent "+score+" spaceships successfully on their way!";
				document.getElementById("txbx_sentence1").value=sentence1;	
				document.getElementById("div_sentence1").style.visibility="visible";	

				}
			}
		}

		if (obj[i].animationstage==3){
			for (var i4=1; i4<=4 ;i4++ )
			{
				document.getElementById("div_spaceship"+i4).style.visibility="hidden";
				document.getElementById("div_number"+i4).style.visibility="hidden";
			}

		}

	}


if(wrong_answer_is_higher_timer>0){
	document.getElementById("div_answerfeedback").style.visibility="visible";
	mousex=0; mousey=0;
	wrong_answer_is_higher_timer=wrong_answer_is_higher_timer-1;

	document.getElementById("txtarea_answerfeedback").style.width="340";
	document.getElementById("txtarea_answerfeedback").value=str1;		

		document.getElementById("div_answerfeedback").style.filter = 'alpha(opacity=' + wrong_answer_is_higher_timer + ')';
		document.getElementById("div_answerfeedback").style.opacity=wrong_answer_is_higher_timer/100;


} else {
	document.getElementById("div_answerfeedback").style.visibility="hidden";

  }


	if (dontshow==false) assign_divs_and_images_to_objects();

	setTimeout('run_main_animation()',delay);
}


function continuegame(){

	for (var i2=1; i2<5; i2++){
		obj[i2].animationstage=0;
		document.getElementById("div_spaceship"+i2).style.visibility="visible";
	}
	
	document.getElementById("div_targetnumber").style.visibility="visible";

	document.getElementById("div_btncontinue").style.visibility="hidden";	
	document.getElementById("div_btnrestart").style.visibility="hidden";	
	document.getElementById("div_btnbacktomenu").style.visibility="hidden";
	document.getElementById("div_exittomenu").style.visibility="visible";	
	document.getElementById("div_sentence1").style.visibility="hidden";

	dontshow=true;
}




function handlemousedown(evt) {

	var e = (window.event) ? window.event : evt; 

	

	if (e.pageX)  {  				//firefox

		mousex=e.pageX; //event.clientX;
		mousey=e.pageY; //event.clientY;
	} else {  					//IE
		mousex=event.clientX;
		mousey=event.clientY;
	}

	for (var i=1; i<5; i++){
		if (checkforcontact(i)=="true") {            
			if (obj[i].istarget==true) {
				obj[i].animationstage=2;
				obj[i].timer1=100;
				
				if(is_msie){playsound_ie(0)}; 
				if(is_chrome){playsound_chrome(0);}
			}
			else {
				 str1="Oops. Think again..."; wrong_answer_is_higher_timer=220;

				if(is_msie){playsound_ie(1)}; 
				if(is_chrome){playsound_chrome(1);}
			}
		}
	}

	return false;
}

function handlemouseup(evt) {

	ready_for_a_new_trial="true";
	return false;
}


function checkforcontact(i){

var rtemp="false";

		var x1=obj[i].x; var x2=obj[i].x+90;
		var y1=obj[i].y; var y2=obj[i].y+70;

		var x3=mousex; 	var x4=mousex+2;
		var y3=mousey; 	var y4=mousey+2;
	
		if(x3>x1&&x3<x2&&y3>y1&&y3<y2) rtemp="true";
		if(x4>x1&&x4<x2&&y3>y1&&y3<y2) rtemp="true";
		if(x3>x1&&x3<x2&&y4>y1&&y4<y2) rtemp="true";
		if(x4>x1&&x4<x2&&y4>y1&&y4<y2) rtemp="true";
		
		if(x2>x3&&x2<x4&&y2>y3&&y2<y4) rtemp="true";
		if(x1>x3&&x1<x4&&y2>y3&&y2<y4) rtemp="true";
		if(x2>x3&&x2<x4&&y1>y3&&y1<y4) rtemp="true";
		if(x1>x3&&x1<x4&&y1>y3&&y1<y4) rtemp="true";	
	
	return rtemp;
}	


					// IE Sound Script

						// DO NOT edit below this line
						document.write('<BGSOUND ID="auIEContainer">')
						IE = (navigator.userAgent.toLowerCase().indexOf('msie')>-1)? 1:0;
						


						function auPreload() {
							Str = "<DIV ID='auEmb' STYLE='position:absolute;'></DIV>";
							document.body.insertAdjacentHTML("BeforeEnd",Str);
							var Str = '';
							for (i=0;i<aySound.length;i++)
							Str += "<EMBED SRC='"+aySound[i].src+"' AUTOSTART='FALSE' HIDDEN='TRUE'>"
							auEmb.innerHTML = Str;
							auCon = document.all.auIEContainer;
							auCon.control = auCtrl;
						}

						function auCtrl(whSound,play) {
							if(play==true){this.src=aySound[whSound].src};
						}

						function playsound_ie(whSound) {auCon.control(whSound,true); }

						function stopsound_ie(whSound) { if (window.auCon) auCon.control(whSound,false); }



						function playsound_chrome(tslil){
//						document.getElementById("sound_element").innerHTML="<embed src='"+aySound[tslil].src+"' hidden=true autostart=true loop=false>";
						
						}