// version war2.js 210303

// All code and interface design are copyright Mike Capstick 2002/3

// but if you want to use it you probably only have to ask   ;-)

// global variables

var response='0';       // set response to wrong

var hits=0;             // used to count hits

var questions=0;        // number of questions in this quiz (review)

ammo=maxterms;



function loadquestions(){

   // build questions and distractors into a string and randomise location of correct answer



   selectstring='';

   for (i=0;i<maxterms;i++)  //loop through questions

       {

          stem='q'+(i+1);  //build stem id



          // build stem and start select boxes

          selectstring=selectstring+"<span id='"+stem+"'>"+stemarray[i]+"</span> "

          selectstring=selectstring+"<select onchange='assess(this);' size='1' onfocus='unselected(this)' "

          selectstring=selectstring+"id='question"+i+1+"'>";

          selectstring=selectstring+"<option value='0'></option>"



          // build the distractors A to D - 1st check if distractor is correct answer

          if (answer[i]=="A"){value=1} else{value=0}

          optionA="<option value='"+value+"'>"+adistract[i]+"</option>"



          if (answer[i]=="B"){value=1} else{value=0}

          optionB="<option value='"+value+"'>"+bdistract[i]+"</option>"



          if (answer[i]=="C"){value=1} else{value=0}

          optionC="<option value='"+value+"'>"+cdistract[i]+"</option>"



          if (answer[i]=="D"){value=1} else{value=0}

          optionD="<option value='"+value+"'>"+ddistract[i]+"</option>"



          selectstring=selectstring+optionA+optionB+optionC+optionD+"</select> "+tail[i]+"<br />"



       }

   document.getElementById('questionsdiv').innerHTML=selectstring

   //quiz title

   document.getElementById('title').firstChild.nodeValue=title;

}





function resetgame(){

 response='0';  	// set response to wrong

 hits=0;        	// used to count hits

 questions=0;   	// set number of questions to 0

        document.getElementById('a1').style.visibility='hidden';

        document.getElementById('b1').style.visibility='hidden';

        document.getElementById('c1').style.visibility='hidden';

        document.getElementById('d1').style.visibility='hidden';

        document.getElementById('a2').style.visibility='hidden';

        document.getElementById('b2').style.visibility='hidden';

        document.getElementById('c2').style.visibility='hidden';

        document.getElementById('d2').style.visibility='hidden';

        document.getElementById('a3').style.visibility='hidden';

        document.getElementById('b3').style.visibility='hidden';

        document.getElementById('c3').style.visibility='hidden';

        document.getElementById('d3').style.visibility='hidden';

        document.getElementById('a4').style.visibility='hidden';

        document.getElementById('b4').style.visibility='hidden';

        document.getElementById('c4').style.visibility='hidden';

        document.getElementById('d4').style.visibility='hidden';



}



// The unselected function stops users from changing a selected answer

// It is called by an onfocus event. If an answer was picked it focus is sent to the window



function unselected(x){

   

   if(response=='1') //check the player has fired their correct amswer shot 

      {document.getElementById('resetbutton').focus(); //make drop box lose focus by focussing elsewhere

       //alert('You must fire a shot by Clicking  on a Map location')

       alertboxer('You must fire a shot by Clicking  on a Map location');

       } 

   else{

        if (x.selectedIndex !=0){

                document.getElementById('resetbutton').focus(); //make drop box lose focus by focussing elsewhere

	if (gametype=='army')  {alertboxer('That answer is locked in Soldier and cannot be changed !');}

	if (gametype=='fleet') {alertboxer('That answer is locked in Sailor and cannot be changed !');}

	if (gametype=='space') {alertboxer('That answer is locked in Space Cadet and cannot be changed !');}

        }

   }

}



function assess(answer){             // assess a selected response

 // First we blur the current object to lock in the answer

 // we force loss of focus to prevent changes by focusing on the reset button

        //window.focus(); didn't  work for ns7, needs focus 

        document.getElementById('resetbutton').focus(); 



      questions=questions+1; // increment question(ammo) count - see fleet destroyed section

    // answer = this,  passed from onChange event by user selection

    // stores option value, 1 or 0 (correct or incorrect), in variable   response

     response = answer.options[answer.selectedIndex].value;



    //check response, increment score if correct and display result

      if (response=='1')

          { answer.style.color='green';

              alertboxer("Correct, Target a location on the Map and Fire at will !");

          }

    else  { answer.style.color='red';

            alertboxer("Incorrect, Permission to fire denied !"); 

            if (questions==ammo&&hits!=7)  // are we out of ammo

               {outofammo();}

          }

    }



function outofammo(){ // check is no more questions available



        if (gametype=='army')

           { alertboxer("Looks like you're out of ammo Soldier !,<br /> Hit the New Game button to play again")}

        if (gametype=='fleet')  

           { alertboxer("Looks like you're out of ammo Sailor !,<br /> Hit the New Game button to play again");}

        if (gametype=='space')  

           { alertboxer("Looks like you're out of plasma bolts Space Cadet ,<br /> Hit the New Game button to play again");}

}



function allowplay(x){

 // is player allowed a turn ?

   if(response=='1')

       {// allowed a turn, has cell been targeted before

         if(document.getElementById(x).style.visibility=='visible')

              { alertboxer('This location has been attacked already, Try another');}

         else {fireshot(x)}

       }

   else{

	if (gametype=='army')

	   {alertboxer("Soldier, before you can fire a shot you must answer a question correctly")}

	if (gametype=='fleet')

           {alertboxer("Sailor, before you can fire a shot you must answer a question correctly")}

	if (gametype=='space')

           {alertboxer("Space cadet, before you can fire a shot you must answer a question correctly")}

	}

}



function fireshot(ship){//getting the value of a text node in a span with an id of  ship

                        // document.getElementById(ship).firstChild.nodeValue

        response='0'    // reset response to zero - must get another question right to fire again



        document.getElementById(ship).style.visibility="visible";

if (gametype=='army')

   {if (document.getElementById(ship).firstChild.nodeValue=="B")

        { alertboxer("Excellent, You hit part of their Military Base"); }

     if (document.getElementById(ship).firstChild.nodeValue=="M")

       {  alertboxer("You hit their Missile Launcher"); }

     if (document.getElementById(ship).firstChild.nodeValue=="S")

        { alertboxer("You Killed an enemy Soldier");}

     if (document.getElementById(ship).firstChild.nodeValue=="x")

        { alertboxer("You missed, Soldier");

          }

 

     // Is the army destroyed  - count hits if any cell has a vehicle that is hit

     if (document.getElementById(ship).firstChild.nodeValue=="B"||

         document.getElementById(ship).firstChild.nodeValue=="M"||

         document.getElementById(ship).firstChild.nodeValue=="S")

        {hits=hits+1;

          if (hits==7)

             {message=''

               message='The Army is destroyed.<br /> Congratulations on your promotion to Captain !'

               message=message+'<br /> Hit the New Game button to play again';



               alertboxer(message);

               resetgame() }

        }                  

               if (questions==ammo&&hits!=7)  // are we out of ammo

                   {outofammo();}

   }



if (gametype=='fleet')   

   {if (document.getElementById(ship).firstChild.nodeValue=="B")

           { alertboxer("Excellent, You hit their Battleship"); }

     if (document.getElementById(ship).firstChild.nodeValue=="M")

           { alertboxer("You hit their Mine Sweeper"); }

     if (document.getElementById(ship).firstChild.nodeValue=="S")

           { alertboxer("You destroyed an enemy Submarine"); }

     if (document.getElementById(ship).firstChild.nodeValue=="x")

           { alertboxer("You missed, Sailor"); }

                          

      // Is the naval fleet destroyed  - count hits if any cell has a ship that is hit

        if (document.getElementById(ship).firstChild.nodeValue=="B"||

           document.getElementById(ship).firstChild.nodeValue=="M"||

           document.getElementById(ship).firstChild.nodeValue=="S")

                {hits=hits+1;

                 if (hits==7){message=''

                              message='The Fleet is destroyed.<br /> Congratulations on your promotion to Captain !'

                              message=message+'<br /> Hit the New Game button to play again';

                             

                              alertboxer(message);

                              resetgame() }

                }

               if (questions==ammo&&hits!=7)  // are we out of ammo

                   {outofammo();}

      }



if (gametype=='space')  

   {if (document.getElementById(ship).firstChild.nodeValue=="B")

           { alertboxer("Excellent, You hit their Star Base"); }

     if (document.getElementById(ship).firstChild.nodeValue=="M")

           { alertboxer("You hit their Mind Control Ship"); }

     if (document.getElementById(ship).firstChild.nodeValue=="S")

           { alertboxer("You vapourised a Star Fighter"); }

     if (document.getElementById(ship).firstChild.nodeValue=="x")

           { alertboxer("You missed, Space cadet"); }

            

     // Is the space fleet destroyed  - count hits if any cell has a ship that is hit

        if (document.getElementById(ship).firstChild.nodeValue=="B"||

            document.getElementById(ship).firstChild.nodeValue=="M"||

            document.getElementById(ship).firstChild.nodeValue=="S")

                {hits=hits+1;

                 if (hits==7){message=''

                       message='The Alien Fleet is destroyed.<br /> Congratulations on your promotion to Space Captain !'

                       message=message+'<br /> Hit the New Game button to play again';

                       

                       alertboxer(message);

                       resetgame()}

                }

               if (questions==ammo&&hits!=7)  // are we out of ammo

                   {outofammo();}

      }

}