using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightGame
{
    public class Enemy : AnimatedGameObject
    {
        protected static readonly double SPEED = 75;
        protected static ResourcePool<Enemy> resourcePool = new ResourcePool<Enemy>();
        public delegate void EnemyLogic(double dt);
        protected EnemyLogic enemyLogic = null;

        static public Enemy UnusedEnemy
        {
            get
            {
                return resourcePool.UnusedObject;
            }
        }

        public Enemy()
        {

        }

        public override void enterFrame(double dt)
        {
            base.enterFrame(dt);
            if (enemyLogic != null) enemyLogic(dt);
        }

        public Enemy startupBasicEnemy(Point dimensions, AnimationData animationData, int zLayer)
        {
            base.startupAnimatedGameObject(dimensions, animationData, zLayer);
            enemyLogic = new EnemyLogic(this.basicEnemyLogic);
            return this;
        }

        public override void shutdown()
        {
            base.shutdown();
            enemyLogic = null;
        }

        protected void basicEnemyLogic(double dt)
        {
            Position = new Point(Position.X, Position.Y + SPEED * dt);
            offscreenCheck();
        }
    }
}