using UnityEngine;
using UnityEngine.Tilemaps;

/// <summary>
/// A component that is also a Tile in a Tilemap. If the Tilemap is not
/// specified it will default to the Tilemap in the parent Game Object.
/// </summary>
public class TileComponent : MonoBehaviour
{
    public Tilemap tilemap;

    Tile tile;
    Vector3 curPos;

    public virtual void Start()
    {
        if (tilemap == null)
        {
            tilemap = GetComponentInParent<Tilemap>();
        }

        tile = ScriptableObject.CreateInstance<Tile>();
        curPos = transform.position;
        SetTile(transform.position);
    }

    /// <summary>
    /// Sets a tile representing the game object to the given location in the
    /// tilemap. Call this method whenever the game object moves to a new
    /// location on the tilemap.
    /// </summary>
    public void SetTile(Vector3 newPos)
    {
        tilemap.SetTile(tilemap.WorldToCell(curPos), null);
        tilemap.SetTile(tilemap.WorldToCell(newPos), tile);
        curPos = newPos;
    }

    public virtual void OnDestroy()
    {
        tilemap.SetTile(tilemap.WorldToCell(curPos), null);
    }
}