PImage aUp;  // up arrow
PImage aLft;  // left arrow
PImage aDwn;  // down arrow
PImage aRt;  // right arrow

//WHITE VERSIONS
PImage aUpW;  // up arrow
PImage aLftW;  // left arrow
PImage aDwnW;  // down arrow
PImage aRtW;  // right arrow

int y;
int [] _chordCoords = new int[5];
PImage [] _images = new PImage[4];

PImage Up;
PImage Dwn;
PImage Lft;
PImage Rt;
PImage blank;

int curImageIndex;
int hit = 0;
int miss = 0;

void setup() {
  size(600, 600);
  background(0);
  frameRate(30);
  
  //inactive images
  aUp = loadImage("images/upArrow.GIF");
  aLft = loadImage("images/leftArrow.GIF");
  aDwn = loadImage("images/downArrow.GIF");
  aRt = loadImage("images/rightArrow.GIF");  
  blank = loadImage("images/blank.GIF");
  
  //active images
  aUpW = loadImage("images/upArrowWhite.GIF");
  aLftW = loadImage("images/leftArrowWhite.GIF");
  aDwnW = loadImage("images/downArrowWhite.GIF");
  aRtW = loadImage("images/rightArrowWhite.GIF");  
  
  Up = aUp;
  Dwn = aDwn;
  Lft = aLft;
  Rt = aRt;
  
  setCurImageIndex();
    
  position(Up, 1);
  position(Lft, 2);
  position(Dwn, 3);
  position(Rt, 4);
  
}

void position(PImage buttonImage, int xPlacement){
   
  if(xPlacement <= 0 || xPlacement >= 5) {return;}
  else if(xPlacement == 1) {
   _chordCoords[1] = 0;
   _images[0] = buttonImage;
  }
  else if(xPlacement == 2) {
   _chordCoords[2] = width/4;
  _images[1] = buttonImage; 
  }
  else if(xPlacement == 3) {
   _chordCoords[3] = width/2; 
   _images[2] = buttonImage;
  }
  else {
   _chordCoords[4] = width-width/4; 
   _images[3] = buttonImage;
  }
}

void setCurImageIndex(){
    curImageIndex = int(random(3)+1);
}

void cycle(){
  
  int speed = int(random(15,25));
  
  if(y<600) {y+=speed;
  } else { 
   y = -200;
   setCurImageIndex();
 }
    _chordCoords[0] = y;

  image(_images[curImageIndex-1],_chordCoords[curImageIndex],_chordCoords[0],width/4,height/4);
//  println(curImageIndex-1);
}

void draw(){

  background(0);
  image(Up, 0, height-height/4, width/4, height/4);
  image(Lft, width/4, height-height/4, width/4, height/4);
  image(Dwn, width/2, height-height/4, width/4, height/4);
  image(Rt, width-width/4, height-height/4, width/4, height/4);
  fill(0,hit,0,hit);
  rect(0,0,600,600);
  fill(miss,0,0,miss);
  rect(0,0,600,600);
  cycle();

}  


void keyPressed() {
  if(key == CODED){
    if (keyCode == UP){
      Up = aUpW;
    } else if(keyCode == DOWN){
      Dwn = aDwnW;
    } else if(keyCode == LEFT) {
      Lft = aLftW;
    } else if(keyCode == RIGHT) {
      Rt = aRtW;
    } else {
      Up = aUp;
      Dwn = aDwn;
      Lft = aLft;
      Rt = aRt;
    }
  }
    if(key == CODED){
    if (keyCode == UP && curImageIndex-1 == 0 && y>=340 && y<=600){
      hit=200;
      println("hit!");
    } else if(keyCode == LEFT && curImageIndex-1 == 1 && y>=340 && y<=600){
      hit=200;
      println("hit!");
    } else if(keyCode == DOWN && curImageIndex-1 == 2 && y>=340 && y<=600) {
      hit=200;
      println("hit!");
    } else if(keyCode == RIGHT && curImageIndex-1 == 3 && y>=340 && y<=600) {
      hit=200;
      println("hit!");
    } else {
      miss=200;
      println("miss!");
    }
  }
}

void keyReleased() {
  if(key == CODED){
    if (keyCode == UP){
      Up = aUp;
    } else if(keyCode == DOWN){
      Dwn = aDwn;
    } else if(keyCode == LEFT) {
      Lft = aLft;
    } else if(keyCode == RIGHT) {
      Rt = aRt;
    } else {
      Up = aUp;
      Dwn = aDwn;
      Lft = aLft;
      Rt = aRt;
    }
  }
      if(key == CODED){
    if (keyCode == UP && curImageIndex-1 == 0 && y>=340 && y<=600){
      hit=0;
      miss=0;
    } else if(keyCode == LEFT && curImageIndex-1 == 1 && y>=340 && y<=600){
      hit=0;
      miss=0;
    } else if(keyCode == DOWN && curImageIndex-1 == 2 && y>=340 && y<=600) {
      hit=0;
      miss=0;
    } else if(keyCode == RIGHT && curImageIndex-1 == 3 && y>=340 && y<=600) {
      hit=0;
      miss=0;
    } else {
      miss=0;
    }
  }
}