import processing.core.*;

public class Fish {
	PApplet p;
  PVector position;
  PVector velocity;
  float pondWidth;
  float pondHeight;
  float pondX;
  float pondY;
  boolean alive;
  float size;
  //float angle;
  Fish (PApplet p, PVector position, float size) {
	  pondWidth = 580;
	  pondHeight = 380;
	  pondX = 10;
	  pondY = 10;
	this.p = p;
    this.position = position;
    this.size = size;
    velocity = new PVector(p.random(-1, 3), p.random(-1, 3));
    alive = true;
  }

  void update() {
    position.add(velocity);
  }
  void detectBound() {
    if (position.x + size * 5 > pondWidth  && alive) {
      velocity.x = - velocity.x;
    }
    if (position.x < pondX + size * 6 && alive) {
      velocity.x = - velocity.x;
    }
    if (position.y > pondHeight - size * 2.5 && alive) {
      velocity.y = - velocity.y;
    }
    if (position.y < pondY + size * 2.5 && alive) {
      velocity.y = - velocity.y;
    }
  }

  boolean detectCollision(Fish otherFish) {
    if (p.abs(position.x - otherFish.position.x) < (size * 5 + otherFish.size * 6)&& p.abs(position.y - otherFish.position.y) < (size * 2 + otherFish.size *2.5)) {
      return true;
    }
    else {
      return false;
    }
  }
  void kill() {
    velocity.x = 0;
    velocity.y = 0;
    alive = false;
  }
  boolean detectOffScreen() {
    if (position.x - size * 6 == pondX || position.x + size * 5 == pondWidth || position.y  - size * 2.5 == pondY || position.y  + size * 2.5 == pondHeight) {
      return true;
    }
    return false;
  }

  void bounce(Fish otherFish) {
    float angle = p.atan2(position.y - otherFish.position.y, position.x - otherFish.position.x);
    velocity.x = 1 * p.cos(angle);
    velocity.y = 1 * p.sin(angle);
    otherFish.velocity.x = 1 * p.cos(angle - p.PI);
    otherFish.velocity.y = 1 * p.sin(angle - p.PI);
  }
}