// declaring a global variable for AI cars
Car[] cars;

//player car
Car player;

//number of cars
int numCars = 500;

//speed of player
int ros = 4;

//sample
Sample sine;

//rate array
int[] sr;
int srCnt;

void setup() {
  //size of canvas
  size(640, 480);
  
  //start up Sonia
  Sonia.start(this);
  //create a sample instance
  sine = new Sample("beck.aif");
  //create empty rate array
  sr = new int[8];
  //fill rate array, high to low
  for (int i=0; i<8; i++) {
    sr[i] = 22000+(8275*(i));
  }
  //counter to step through rate array
  srCnt = 0;

  //making an empty array of AI cars
  cars = new Car[numCars];

  //populating that array
  for (int i=0; i<numCars; i++) {
    cars[i] = new Car();
    cars[i].x = random(0, width);
    cars[i].y = random(0, height);
    cars[i].w = 5;
    cars[i].h = 5;
  }

  //making a player car
  player = new Car();
  player.x = width/2;
  player.y = height/2;
  player.w = 5;
  player.h = 5;

}

void loop() {
  //refresh
  background(color(255,255,255));
  for (int i=0; i<numCars; i++) {
    cars[i].drawAICar();
    cars[i].aiDrive();
    cars[i].check();
  }
  
  player.drawPCar();
  keyPressed();

}

void keyPressed() {
  //player moves w/ WSDA
  //speed is determined by global var rATE oF sPEED
  if (key == 'w') {
    player.y-=ros;
  }
  if (key == 's') {
    player.y+=ros;
  }
  if (key == 'd') {
    player.x+=ros;
  }
  if (key == 'a') {
    player.x-=ros;
  }

}

class Car {
  //vars
  float x,y,w,h,tx,ty,delta_x,delta_y;
  int travel, distance, dir, hits;

  //draws the AI cars out
  void drawAICar()
  {
    rectMode(CENTER_RADIUS);
    fill(255, 250, 50, 200);
    rect(x, y, w, h);
  }

  void redirect() {
    //pick a distance (pixels) to travel
    distance = int(random(40) + 20);
    //variable to determine distance travelled
    travel = 0;
    //pick a direction
    dir = int(random(4));
  }
  
  void checkBnds() {
    //right boundary
    if (x>width) {
      redirect();
    }
    //left boundary
    if (x<0) {
      redirect();
    }
    //top boundary
    if (y<0) {
      redirect();
    }
    //bottom boundary
    if (y>height) {
      redirect();
    }
  }

  void aiDrive() {
    //move left
    if (dir == 0) {
      if (travel<distance) {
        x--;
        travel++;
        checkBnds();
      } else {
        redirect();
      }
    }
    //move right
    if (dir == 1) {
      if (travel<distance) {
        x++;
        travel++;
        checkBnds();
      } else {
        //get a new distance and direction
        redirect();
      }
    }
    //move up
    if (dir == 2) {
      if (travel<distance) {
        y--;
        travel++;
        checkBnds();
      } else {
        //get a new distance and direction
        redirect();
      }
    }
    //move down
    if (dir == 3) {
      if (travel<distance) {
        y++;
        travel++;
        checkBnds();
      } else {
        //get a new distance and direction
        redirect();
      }
    }
  }

  //draws the AI cars out
  void drawPCar()
  {
    rectMode(CENTER_RADIUS);
    fill(255, 0, 0, 200);
    rect(x, y, w, h);
  }

/*
  boolean collision(Car check) {
    //print(check.x);
      if (this.x == check.x || this.x + this.w == check.x) {
        return true;
      } else {
        return false;
      }
  }
*/

  void setTarget(float xin, float yin)
  {
    tx = xin;
    ty = yin;
  }
  
  void check() {
    //set the x,y target as the human
    setTarget(player.x, player.y);

    //calculate the delta x, y
    delta_x = tx-x;
    delta_y = ty-y;

    //determine distance from player based on hypoteneuse (c)
    float a_squared = sq(delta_x);
    float b_squared = sq(delta_y);
    float c = sqrt(a_squared+b_squared);
    //print(c + " ");

    //check distance (if we are close, then hunt, if we are far, then don't
    if (c<10) {
      hits++;
      if (hits==1) {
        float rate = sr[srCnt];
        sine.setRate(rate);
        sine.play();
        if (srCnt<7) {
          srCnt++;
        } else {
          srCnt=0;
        }
      }
    } else {
       hits=0;
    }
  }
  
}