using UnityEngine;

namespace EerieVillage.Skills.Effectors
{
    /// <summary>
    /// PD 지시 2026-05-13 — 모든 액티브 스킬 판정 영역 시각화 공용 helper.
    /// 붉은 반투명 박스 (1×1 white sprite·color 1,0,0,0.35) 를 size 만큼 scale.
    /// </summary>
    public static class HitboxDebug
    {
        /// <summary>지정 world 좌표·size 박스 spawn·lifetime 후 destroy. lifetime=0 영역 영구.</summary>
        public static GameObject Spawn(Vector2 pos, Vector2 size, float lifetime)
        {
            var go = new GameObject("Hitbox_Debug");
            // PD 지시 2026-05-13 — 런타임 spawn 박스 Scene 저장 회피 (Edit Mode execute 시 잔존 방지)
            go.hideFlags = HideFlags.DontSave;
            go.transform.position = (Vector3)pos;
            go.transform.localScale = new Vector3(size.x, size.y, 1f);
            AttachSprite(go);
            if (lifetime > 0f) Object.Destroy(go, lifetime);
            return go;
        }

        /// <summary>지정 Transform 의 자식으로 박스 attach (target 이동 시 함께 이동·scale 은 size 그대로 유지).</summary>
        public static GameObject AttachToTransform(Transform target, Vector2 size)
        {
            var go = new GameObject("Hitbox_Debug");
            go.hideFlags = HideFlags.DontSave;
            go.transform.SetParent(target, false);
            go.transform.localPosition = Vector3.zero;
            // parent lossyScale 보정 — local scale 환산
            float px = target.lossyScale.x != 0f ? Mathf.Abs(target.lossyScale.x) : 1f;
            float py = target.lossyScale.y != 0f ? Mathf.Abs(target.lossyScale.y) : 1f;
            go.transform.localScale = new Vector3(size.x / px, size.y / py, 1f);
            AttachSprite(go);
            return go;
        }

        static void AttachSprite(GameObject go)
        {
            var sr = go.AddComponent<SpriteRenderer>();
            sr.sprite = GetWhiteSprite();
            sr.color = new Color(1f, 0f, 0f, 0.35f);
            sr.sortingOrder = 100;
        }

        static Sprite _whiteSprite;
        public static Sprite GetWhiteSprite()
        {
            if (_whiteSprite != null) return _whiteSprite;
            var tex = new Texture2D(2, 2, TextureFormat.RGBA32, false);
            var pixels = new Color[4];
            for (int i = 0; i < 4; i++) pixels[i] = Color.white;
            tex.SetPixels(pixels);
            tex.Apply();
            _whiteSprite = Sprite.Create(tex, new Rect(0, 0, 2, 2), new Vector2(0.5f, 0.5f), 2);
            return _whiteSprite;
        }
    }
}