using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Storage;
using Microsoft.Xna.Framework.Audio;

using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;

using System;
using System.Collections.Generic;
using System.Text;

namespace VerticalShot
{
    class Enemy : Sprite
    {
        Random Enemy_Start_Position = new Random();
        const string ENEMY_ASSETNAME = "enemy";
         int START_POSITION_X = 0;
        const int START_POSITION_Y = -3;
        const int ENEMY_SPEED = 160;
        const int MOVE_DOWN = 1;

        Vector2 mDirection = Vector2.Zero;
        Vector2 mSpeed = Vector2.Zero;

        public void LoadContent(ContentManager theContentManager)
        {
            START_POSITION_X = Enemy_Start_Position.Next(700);
            Position = new Vector2(START_POSITION_X, START_POSITION_Y);
            base.LoadContent(theContentManager, ENEMY_ASSETNAME);
        }

        public void Update(GameTime theGameTime)
        {
            UpdateMovement();
            base.Update(theGameTime, mSpeed, mDirection);
        }

        private void UpdateMovement()
        {
            mSpeed = Vector2.Zero;
            mDirection = Vector2.Zero;

            if(START_POSITION_Y < 650)
            {
                mSpeed.X = ENEMY_SPEED;
                mDirection.Y = MOVE_DOWN;
            }
        }
    }
}