using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[ExecuteInEditMode, DisallowMultipleComponent]
[RequireComponent(typeof(TopDownTransform))]
[RequireComponent(typeof(SpriteRenderer))]
public class TopDownShadowCaster : MonoBehaviour
{
	[SerializeField] private Color m_Color = Color.black;
	[SerializeField] private Vector2 m_Scale = new Vector2(1, 0.5f);

	private GameObject m_Shadow;
	private SpriteRenderer m_ShadowRenderer;

	private TopDownTransform m_Coord;
	private SpriteRenderer m_SpriteRenderer;

	private void Start()
	{
		m_Coord = GetComponent<TopDownTransform>();
		m_SpriteRenderer = GetComponent<SpriteRenderer>();

		if (m_Shadow == null)
		{
			m_Shadow = new GameObject("shadow");
			m_Shadow.hideFlags = HideFlags.HideAndDontSave;
			m_Shadow.transform.SetParent(transform);

			m_Shadow.transform.localScale = m_Scale;

			m_ShadowRenderer = m_Shadow.AddComponent<SpriteRenderer>();
			m_ShadowRenderer.color = m_Color;
			m_ShadowRenderer.sprite = m_SpriteRenderer.sprite;
			m_ShadowRenderer.sortingLayerName = "Shadow";

		}
	}

	private void Update()
	{
		if (m_Shadow == null)
			return;

		m_ShadowRenderer.color = m_Color;

		Vector3 pos = m_Coord.GetGround3DPosition();
		m_Shadow.transform.position = pos;
	}

}