/**
 *  Enemy object
 *
 *
 *  @param Int speed - Speed in pixels
 *  @param Int hp - Hit points
 */
function Enemy() {

  this.init = function (path, startPosition, startSpeed, startHp) {
    this.path = path;
    this.destination = 0;

    this.size = 5;

    this.startPosition = startPosition;
    this.position = startPosition;
    console.log(this.startPosition);

    this.direction = 0;
    this.speed = startSpeed;

    this.hp = startHp;
    this.maxHp = this.hp;

    this.findDirection();
  }

  this.findDirection = function () {
    if(this.position[1]>this.path[this.destination][1]) {
      this.direction = 0;
    } else if(this.position[0]<this.path[this.destination][0]) {
      this.direction = 1;
    } else if(this.position[1]<this.path[this.destination][1]) {
      this.direction = 2;
    } else if(this.position[0]>this.path[this.destination][0]) {
      this.direction = 3;
    }
  }

  this.update = function () {
    if(this.direction==0) {
      this.position[1]-=this.speed;
    } else if(this.direction==1) {
      this.position[0]+=this.speed;
    } else if(this.direction==2) {
      this.position[1]+=this.speed;
    } else if(this.direction==3) {
      this.position[0]-=this.speed;
    }

    //If we reach destination - find next one
    //... and we use pythagoras to find that out
    var a = b = c = 0;
    a = this.path[this.destination][0]-this.position[0];
    b = this.path[this.destination][1]-this.position[1];
    c = Math.sqrt((Math.pow(a, 2)+Math.pow(b, 2)));
    if(c<1) {
      this.destination++;

      //If enemy reached end position/castle
      if(this.destination >= this.path.length) {
        this.restart();
      } else {
        this.findDirection();
      }
    }
  }

  this.restart = function () {
    this.destination = 0;
    console.log(this.position);
    this.position = [18,432];
    console.log(this.position);
    this.findDirection();
  }

  this.draw = function () {
    canvas.fillStyle("blue");
    canvas.circle(
      this.position[0],
      this.position[1],
      this.size
    );
  }
}