using UnityEngine;
using UnityEngine.Tilemaps;

namespace Platformer.Mechanics
{
    /// <summary>
    /// 게임 시작 시 프레임·렌더·물리 영역 기본 최적화 + One-Way Platform 자동 적용.
    /// PD 지시 2026-05-07 — 스크롤 버벅임 보완 + 점프·이동 시 지형 통과(One-Way Platform).
    /// </summary>
    public static class GameOptimizer
    {
        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
        static void Init()
        {
            Application.targetFrameRate = 60;
            QualitySettings.vSyncCount = 0;
            Time.fixedDeltaTime = 1f / 60f;

            // BT5-Dev #34 — Layer Matrix 영역 = Player(13) ↔ Enemy(14)만 OFF. JumpThrough Layer 8 영역 폐기.
            // OneWay = PlatformEffector2D 영역 표준 패턴 활용 (Layer Matrix 폐기)
            Physics2D.IgnoreLayerCollision(13, 14, true);
            Debug.Log($"[BT34-LayerSep] Player(13) ↔ Enemy(14) collision OFF (Layer 8 영역 폐기·PlatformEffector2D 영역 활용)");
        }

        /// <summary>
        /// BT5-Dev #27 — PD 제안: Layer 8(JumpThrough) + Raycast 동적 충돌.
        /// PlatformEffector2D 폐기. 모든 일반 BoxCollider2D를 Layer 8로 변환 → 기본 통과 + Player 발 Raycast 시점만 충돌 활성.
        /// 제외: Tilemap·Player·Enemy·DeathZone·VictoryZone·TokenInstance·AttackHitbox·Trigger Collider.
        /// </summary>
        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
        static void SetupJumpThroughPlatforms()
        {
            // BT5-Dev #46 — PD 제안 채택: Level Tilemap = Layer 0 (일반 지면·벽 영구 충돌) / Foreground Tilemap = Layer 16 (공중 발판 Drop-Through·Tile m_ColliderType=Sprite 런타임 강제)
            int applied = 0, excluded = 0, levelKept = 0;
            var allColliders = Object.FindObjectsByType<Collider2D>(FindObjectsSortMode.None);
            var appliedNames = new System.Collections.Generic.List<string>();
            foreach (var c in allColliders)
            {
                if (c == null) continue;
                if (c.isTrigger) { excluded++; continue; }
                if (c.GetComponent<PlayerController>() != null
                    || c.GetComponent<EnemyController>() != null
                    || c.GetComponent<DeathZone>() != null
                    || c.GetComponent<TokenInstance>() != null
                    || c.GetComponent<VictoryZone>() != null
                    || c.GetComponent<AttackHitbox>() != null)
                {
                    excluded++;
                    continue;
                }

                // BT46 — Level Tilemap (TilemapCollider2D + name='Level') = Layer 0 (일반 지면·벽 영구 충돌)
                if (c.GetComponent<UnityEngine.Tilemaps.TilemapCollider2D>() != null && c.gameObject.name == "Level")
                {
                    if (c.gameObject.layer == 16) c.gameObject.layer = 0;  // 잔존 복원
                    var lvlEffector = c.GetComponent<PlatformEffector2D>();
                    if (lvlEffector != null) Object.Destroy(lvlEffector);
                    c.usedByEffector = false;
                    levelKept++;
                    continue;
                }

                var effector = c.GetComponent<PlatformEffector2D>();
                if (effector != null) Object.Destroy(effector);
                c.usedByEffector = false;
                c.gameObject.layer = 16;
                applied++;
                if (appliedNames.Count < 8) appliedNames.Add($"{c.gameObject.name}({c.GetType().Name})");
            }

            // BT46 — Foreground GameObject TilemapCollider2D + Layer 16 + 모든 Tile m_ColliderType=Sprite 런타임 강제
            var foreground = GameObject.Find("Foreground");
            if (foreground != null)
            {
                var fgTc = foreground.GetComponent<UnityEngine.Tilemaps.TilemapCollider2D>();
                if (fgTc == null) fgTc = foreground.AddComponent<UnityEngine.Tilemaps.TilemapCollider2D>();
                foreground.layer = 16;

                var fgTilemap = foreground.GetComponent<UnityEngine.Tilemaps.Tilemap>();
                if (fgTilemap != null)
                {
                    var bounds = fgTilemap.cellBounds;
                    int forced = 0;
                    for (int x = bounds.xMin; x <= bounds.xMax; x++)
                    {
                        for (int y = bounds.yMin; y <= bounds.yMax; y++)
                        {
                            var pos = new Vector3Int(x, y, 0);
                            if (fgTilemap.HasTile(pos))
                            {
                                fgTilemap.SetColliderType(pos, UnityEngine.Tilemaps.Tile.ColliderType.Sprite);
                                forced++;
                            }
                        }
                    }
                    fgTc.ProcessTilemapChanges();
                    Debug.Log($"[BT46-Foreground] TilemapCollider2D + Layer 16 + ColliderType=Sprite forced on {forced} tiles");
                }
            }

            Debug.Log($"[BT46-DropThrough] Layer16 applied={applied} levelKeptLayer0={levelKept} excluded={excluded} total={allColliders.Length}");
            Debug.Log($"[BT46-DropThrough] appliedSamples=[{string.Join(", ", appliedNames)}]");
        }
    }
}