// =================================================================================================
// Sample Mind for more complex starter WWM World  
// =================================================================================================




// World tells us agent position and enemy position
// World does not tell us of existence of walls
// if return invalid move (not empty square) World just ignores it and we miss a turn 


 

function randomPick ( a, b )
{
 if ( randomBoolean() ) 
  return a;
 else
  return b;
}




function Mind() { 


//--- public functions / interface / API ----------------------------------------------------------


	this.newRun = function()
	{
	};

	this.endRun = function()
	{
	};



	this.getAction = function ( x )		// x is an array of [ ai, aj, pai, paj ]
	{ 
		var ai = x[0];
		var aj = x[1];
		var pai = x[2];
		var paj = x[3];
   

    var curDis = Math.round(Math.sqrt((5-ai)*(5-ai)+(5-aj)*(5-aj)));
    var preDis = Math.round(Math.sqrt((5-pai)*(5-pai)+(5-paj)*(5-paj)));
    
    var lastMoveGood = curDis < preDis;
    var lastAction = ACTION_STAYSTILL;
    
    if(pai < ai) { lastAction = ACTION_RIGHT; }
    if(paj < aj) { lastAction = ACTION_UP; }
    if(ai < pai) { lastAction = ACTION_LEFT; }
    if(aj < paj) { lastAction = ACTION_DOWN; }
    
    if(lastMoveGood) {
        //do  it again
        if(lastAction == ACTION_LEFT) { return (randomPick (ACTION_LEFT, (randomPick(ACTION_UP, ACTION_DOWN)))); }
        if(lastAction == ACTION_RIGHT) { return (randomPick (ACTION_RIGHT, (randomPick(ACTION_UP, ACTION_DOWN)))); }
        if(lastAction == ACTION_UP) { return (randomPick (ACTION_UP, (randomPick(ACTION_LEFT, ACTION_RIGHT)))); }
        if(lastAction == ACTION_DOWN) { return (randomPick (ACTION_DOWN, (randomPick (ACTION_LEFT, ACTION_RIGHT)))); }
        else { return (randomPick (ACTION_LEFT, ACTION_UP)); }
    }
    else {
        //go the otherway
        if(lastAction == ACTION_LEFT) { return (randomPick (ACTION_RIGHT, (randomPick(ACTION_UP, ACTION_DOWN)))); }
        if(lastAction == ACTION_RIGHT) { return (randomPick (ACTION_LEFT, (randomPick(ACTION_UP, ACTION_DOWN)))); }
        if(lastAction == ACTION_UP) { return (randomPick (ACTION_DOWN, (randomPick (ACTION_LEFT, ACTION_RIGHT)))); }
        if(lastAction == ACTION_DOWN) { return (randomPick (ACTION_UP, (randomPick(ACTION_LEFT, ACTION_RIGHT)))); }
        else { return (randomPick (ACTION_LEFT, ACTION_UP)); }
    }
    
 		return  ( randomintAtoB (0,3) );
	}


}