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

namespace AiTest
{
  abstract class EnemySprite : Sprite
  {
		#region  Protected Constructors  

    protected EnemySprite(Direction preferredDirection, Direction fallbackDirection)
    {
      this.PreferredDirection = preferredDirection;
      this.FallbackDirection = fallbackDirection;
    }

		#endregion  Protected Constructors  

		#region  Public Overridden Methods  

    public override CollisionAction GetCollisionAction(Sprite collidedWith)
    {
      CollisionAction result;

      if (collidedWith is PlayerSprite)
        result = CollisionAction.Explode; // Kill player
      else
        result = CollisionAction.None; // Do nothing

      return result;
    }

    public override void Move()
    {
      Tile tile;
      Sprite collision;

      collision = null;

      // first see if we can move in our preferred direction
      tile = this.GetAdjacentTile(this.GetNewDirection(this.PreferredDirection));
      if (!this.Map.IsScenery(tile) && !this.IsCollision(tile.Location, out collision))
      {
        // we can move here, update our position and also set our new direction
        this.Location = tile.Location;
        this.Direction = this.GetNewDirection(this.PreferredDirection);
      }
      else
      {
        // can't move in our preferred direction, so lets try the direction the sprite is facing
        tile = this.GetAdjacentTile(this.Direction);
        if (!this.Map.IsScenery(tile) && !this.IsCollision(tile.Location, out collision))
        {
          // we can move here, update our position, but not the direction
          this.Location = tile.Location;
        }
        else
        {
          // can't move forwards either, so finally lets just turn in our fallback direction
          this.Direction = this.GetNewDirection(this.FallbackDirection);
        }
      }

      // if we collided with a sprite, lets execute the action
      if (collision != null && this.GetCollisionAction(collision)== CollisionAction.Explode)
      {
        // kill both this sprite and the one we collided with
        this.Map.Sprites.Remove(collision);
        this.Map.Sprites.Remove(this);
      }
    }

		#endregion  Public Overridden Methods  

		#region  Protected Properties  

    protected Direction FallbackDirection { get; set; }

    protected Direction PreferredDirection { get; set; }

		#endregion  Protected Properties  
  }

}