var x=600;
var level=1;
var trial=1;
var number_to_analyze=Math.floor(Math.random()*900+199);

var obj=new Array(100);
var trial=1;
var mousex=0, mousey=0;
var ready_for_a_new_trial="false";
var number_to_extract_temp=100;
var sentence1="";
var str1=" ";
var trialminus1=0;
var number_animation_time_counter=0;
var number_animation_time_counter_active="false";
var rand1,rand2,rand3,rand4,repeatthis,number1,number2,number3,number4;
var mishtaneezer;
var dontshow=false;
var score=0;
var targetnumber;
var tempnumber;
var wrong_answer_is_higher_timer=0;
var delay=15;
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;


	pic1= new Image(1024,768); pic1.src="./apollo-moon-landers_images/moon2.jpg"; 
	pic_black_background= new Image(1022,620); pic_black_background.src="apollo-moon-landers_images/black_background.gif";	


		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;
		 }
		}

		if(winW<1000){document.getElementById("div_ad").style.left=860}  //setting the left limit of the ad location
		else {document.getElementById("div_ad").style.left=winW-160;}  

		if(winW>1200) {document.getElementById("div_ad").style.left=1040;} //setting the right limit of the ad location



		temp=winW-160-110;  //setting the location of the black background left to the ad
		if(temp<750) temp=750;  //setting the left limit to the black background
		if(temp>1010) temp=1010;  //setting the right limit to the black background
		document.getElementById("div_black_background").style.left=temp;

		winW=temp-120; //defining the screen width without ad and black for the animations (if needed) - specific for this game.

}



function init_main(){

	if(is_msie){auPreload();}

//	document.onmousemove=handlemousemove;
	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 "
//	document.getElementById("img_black_background").src=pic_black_background.src;
//	document.getElementById("div_black_background").style.visibility="visible";


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

	obj[1].y=80;	obj[2].y=180;	obj[3].y=280;	obj[4].y=380;


	init_this_task_variables();

	assign_divs_and_images_to_objects();	

	run_main_animation();

}

function init_this_task_variables(){

	document.getElementById("div_spaceship1").style.visibility="visible";
	document.getElementById("div_spaceship2").style.visibility="visible";
	document.getElementById("div_spaceship3").style.visibility="visible";
	document.getElementById("div_spaceship4").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";
	document.getElementById("div_score1").style.left=20;
	document.getElementById("div_score1").style.top=500;


	set_numbers_to_spaceships();
	
}


         
function set_numbers_to_spaceships(){





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

	rand1=Math.floor(Math.random()*8)+2;	
	rand2=Math.floor(Math.random()*8)+2;	

	do	{
		number1=rand1*rand2;  obj[1].numbervalue=number1;
		number2=Math.floor(Math.random()*99)+1; obj[2].numbervalue=number2;
		number3=Math.floor(Math.random()*99)+1; obj[3].numbervalue=number3;
		number4=Math.floor(Math.random()*99)+1; obj[4].numbervalue=number4;
	}
	while (number1==number2||number1==number3||number1==number4||number2==number3||number2==number4||number3==number4);






for (i3=0;i3<=350 ;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=" How much is: "+rand1+"x"+rand2;
	document.getElementById("txbx_targetnumber").value=sentence1;	









}


function assign_divs_and_images_to_objects(){ 

	
			document.getElementById("div_spaceship1").style.left=obj[1].x;
			document.getElementById("div_spaceship1").style.top=obj[1].y;
			document.getElementById("img_spaceship1").style.width=obj[1].sizex;
			document.getElementById("img_spaceship1").style.height=obj[1].sizey;
			document.getElementById("div_number1").style.left=obj[1].x+obj[1].xnumber;
			document.getElementById("div_number1").style.top=obj[1].y+obj[1].ynumber;

			document.getElementById("div_spaceship2").style.left=obj[2].x;
			document.getElementById("div_spaceship2").style.top=obj[2].y;
			document.getElementById("img_spaceship2").style.width=obj[2].sizex;
			document.getElementById("img_spaceship2").style.height=obj[2].sizey;
			document.getElementById("div_number2").style.left=obj[2].x+obj[2].xnumber;
			document.getElementById("div_number2").style.top=obj[2].y+obj[2].ynumber;

			document.getElementById("div_spaceship3").style.left=obj[3].x;
			document.getElementById("div_spaceship3").style.top=obj[3].y;
			document.getElementById("img_spaceship3").style.width=obj[3].sizex;
			document.getElementById("img_spaceship3").style.height=obj[3].sizey;
			document.getElementById("div_number3").style.left=obj[3].x+obj[3].xnumber;
			document.getElementById("div_number3").style.top=obj[3].y+obj[3].ynumber;

			document.getElementById("div_spaceship4").style.left=obj[4].x;
			document.getElementById("div_spaceship4").style.top=obj[4].y;
			document.getElementById("img_spaceship4").style.width=obj[4].sizex;
			document.getElementById("img_spaceship4").style.height=obj[4].sizey;
			document.getElementById("div_number4").style.left=obj[4].x+obj[4].xnumber;
			document.getElementById("div_number4").style.top=obj[4].y+obj[4].ynumber;



}

function set_locations_to_spaceships(){

	for (i1=1; i1<5; i1++){
		obj[i1].x=Math.floor(Math.random()*400+150);
		obj[i1].animationstage=0;
		obj[i1].timer1=100;

	}



}




function obj_prototype(){

	this.x=Math.floor(Math.random()*400+150);
	this.y=Math.floor(Math.random()*400+10);
	this.xnumber=52;
	this.ynumber=29;
	this.numbervalue=4837;
	this.movex=1;
	this.movey=0;
	this.istarget=false;
	this.animationstage=0;
	this.timer1=100;
	this.moveacceleration=0;
	this.sizex=125;
	this.sizey=95;

}



function run_main_animation(){

	for (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].timer1-1;
				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>winW||obj[i].x>785||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].animationstage==2){
			obj[i].movey=0;


				document.getElementById("div_number1").style.visibility="hidden";
				document.getElementById("div_number2").style.visibility="hidden";
				document.getElementById("div_number3").style.visibility="hidden";
				document.getElementById("div_number4").style.visibility="hidden";


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

			obj[i].moveacceleration=-0.021;

		}




		if (obj[i].animationstage==21){    			//animating the spacship landing
			obj[i].moveacceleration=obj[i].moveacceleration+0.0004;
			if(obj[i].movey<1){obj[i].movey=obj[i].movey+obj[i].moveacceleration/1;}
			obj[i].y=obj[i].y+obj[i].movey*5;
			obj[i].sizex=obj[i].sizex*(1-obj[i].moveacceleration)*1.001; 
			obj[i].sizey=obj[i].sizey*(1-obj[i].moveacceleration)*1.001; 

			if(obj[i].y>480) {document.getElementById("div_spaceship"+i).style.visibility="hidden";}


			if (obj[i].y>500) {				//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=80;	obj[2].y=180;	obj[3].y=280;	obj[4].y=380;
					set_numbers_to_spaceships();					
					set_locations_to_spaceships();
					

					obj[i2].animationstage=0;


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

					

					obj[i2].sizex=125;
					obj[i2].sizey=95;

					document.getElementById("div_spaceship"+i).style.visibility="visible";

				}

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

					}

				document.getElementById("div_btncontinue").style.visibility="visible";	
				document.getElementById("div_btncontinue").style.left=20;	

				document.getElementById("div_btnrestart").style.visibility="visible";	
				document.getElementById("div_btnrestart").style.left=20;	
							     
				document.getElementById("div_btnbacktomenu").style.visibility="visible";	
				document.getElementById("div_btnbacktomenu").style.left=20;	

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

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

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

					

				}


			}
		}

		if (obj[i].animationstage==3){

			document.getElementById("div_spaceship1").style.visibility="hidden";
			document.getElementById("div_spaceship2").style.visibility="hidden";
			document.getElementById("div_spaceship3").style.visibility="hidden";
			document.getElementById("div_spaceship4").style.visibility="hidden";

			document.getElementById("div_number1").style.visibility="hidden";
			document.getElementById("div_number2").style.visibility="hidden";
			document.getElementById("div_number3").style.visibility="hidden";
			document.getElementById("div_number4").style.visibility="hidden";
			
		}

		
	}  // close the "for (i=1; i<5; i++)


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="400";
	document.getElementById("txtarea_answerfeedback").value="Oops. Try a "+str1+" number...";		

		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 (i2=1; i2<5; i2++){
		obj[i2].animationstage=0;
	}

	document.getElementById("div_spaceship1").style.visibility="visible";
	document.getElementById("div_spaceship2").style.visibility="visible";
	document.getElementById("div_spaceship3").style.visibility="visible";
	document.getElementById("div_spaceship4").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 (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 {
				if(obj[1].animationstage!=2){
					 if(is_msie){playsound_ie(1)}; if(is_chrome){playsound_chrome(1);}
					 if(obj[i].numbervalue<obj[1].numbervalue){	wrong_answer_is_higher_timer=250; str1="larger";} else {wrong_answer_is_higher_timer=250; str1="smaller";}
				}



			}

		}
		

	}

	

	return false;
}

function handlemouseup(evt) {

	ready_for_a_new_trial="true";


	return false;
}


function checkforcontact(i){

var rtemp="false";


		x1=obj[i].x; x2=obj[i].x+150;
		y1=obj[i].y; y2=obj[i].y+150;


		x3=mousex; 	x4=mousex+2;
		y3=mousey; 	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); }


					// Chrome Sound Script

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