using System.Collections;
using System.Collections.Generic;
using Platformer.Gameplay;
using UnityEngine;
using static Platformer.Core.Simulation;

namespace Platformer.Mechanics
{
    /// <summary>
    /// A simple controller for enemies. Provides movement control over a patrol path.
    /// </summary>
    [RequireComponent(typeof(AnimationController), typeof(Collider2D))]
    public class EnemyController : MonoBehaviour
    {
        public PatrolPath path;
        public AudioClip ouch;

        /// <summary>BT5-Dev #16 — Distance 기반 감지 영역 X 임계값 (전체 폭). 표준 platformer Enemy 옆 닿음 영역 0.6~0.8.</summary>
        public float hitRangeX = 0.7f;
        /// <summary>Y 임계값. 위/아래 둘 다 인정.</summary>
        public float hitRangeY = 1.0f;
        /// <summary>밟기 판정 — Player가 Enemy보다 위 거리.</summary>
        public float stompMinDy = 0.5f;

        internal PatrolPath.Mover mover;
        internal AnimationController control;
        internal Collider2D _collider;
        internal AudioSource _audio;
        SpriteRenderer spriteRenderer;

        public Bounds Bounds => _collider.bounds;

        /// <summary>
        /// PD 지시 2026-05-07 — Enemy 시각(SpriteRenderer) 영역 기반 충돌 감지용. CapsuleCollider2D는 작은 ground sensor 영역(0.45×0.09)이라 감지에 부적합.
        /// SpriteRenderer 부재 시 Collider Bounds로 fallback.
        /// </summary>
        public Bounds VisualBounds => spriteRenderer != null ? spriteRenderer.bounds : _collider.bounds;

        PlayerController _cachedPlayer;

        void Awake()
        {
            control = GetComponent<AnimationController>();
            _collider = GetComponent<Collider2D>();
            _audio = GetComponent<AudioSource>();
            spriteRenderer = GetComponent<SpriteRenderer>();

            // PD 지시 2026-05-07 — Player ↔ Enemy 물리 충돌 무시 (통과 가능). 감지는 Bounds.Intersects 별도.
            // Enemy Collider 일반 유지 (지면 충돌 영역 보존) → 등장 정합.
            var playerObj = GameObject.FindGameObjectWithTag("Player");
            if (playerObj != null && _collider != null)
            {
                var pc = playerObj.GetComponent<Collider2D>();
                if (pc != null) Physics2D.IgnoreCollision(_collider, pc, true);
            }

            // BT5-Dev #17 marker — 본 영역 출력 시 새 코드 영역 적용 정합. 출력 X = Editor Asset Refresh 영역 미수행
            Debug.Log($"[BT17-MARKER@{name}] sr={(spriteRenderer != null ? "OK" : "NULL")} hitX={hitRangeX} hitY={hitRangeY} stomp={stompMinDy} | colB={_collider?.bounds.size} vB={VisualBounds.size}");
        }

        void Update()
        {
            if (path != null)
            {
                if (mover == null) mover = path.CreateMover(control.maxSpeed * 0.5f);
                control.move.x = Mathf.Clamp(mover.Position.x - transform.position.x, -1, 1);
            }

            // PD 지시 2026-05-07 — Player ↔ Enemy 통과 가능이지만 Bounds.Intersects로 매 프레임 감지
            if (_cachedPlayer == null)
            {
                // 1차: tag 영역 발견
                var pgo = GameObject.FindGameObjectWithTag("Player");
                if (pgo != null) _cachedPlayer = pgo.GetComponent<PlayerController>();

                // 2차 fallback: tag 영역 미설정 영역에 대비해 PlayerController 영역 직접 검색
                if (_cachedPlayer == null)
                {
                    _cachedPlayer = Object.FindFirstObjectByType<PlayerController>();
                }

                if (Time.frameCount % 60 == 0)
                {
                    int allCount = Object.FindObjectsByType<PlayerController>(FindObjectsSortMode.None).Length;
                    Debug.Log($"[BT17-Update@{name}] f={Time.frameCount} cached={(_cachedPlayer != null ? _cachedPlayer.name : "NULL")} pgoTag={(pgo != null ? pgo.name : "NULL")} allPCcount={allCount}");
                }
            }
            if (_cachedPlayer != null && _cachedPlayer.health != null && _cachedPlayer.health.IsAlive)
            {
                // BT5-Dev #16 — Distance 기반 단순 감지 (Bounds 영역 산수 영역 의존 X·항상 작동)
                // dx 0.7·|dy| 1.0 = 표준 platformer Enemy/Player 닿음 영역. dy > 0.5 = Player가 Enemy 위에서 밟음.
                Vector3 ePos = transform.position;
                Vector3 pPos = _cachedPlayer.transform.position;
                float dx = Mathf.Abs(pPos.x - ePos.x);
                float dy = pPos.y - ePos.y;

                bool inRange = dx < hitRangeX && Mathf.Abs(dy) < hitRangeY;

                if (inRange != _diagWasIntersecting)
                {
                    Debug.Log($"[EnemyDiag@{name}] inRange={inRange} dx={dx:F2} dy={dy:F2} (thresholds dx<{hitRangeX} |dy|<{hitRangeY}) | ePos={ePos} pPos={pPos}");
                    _diagWasIntersecting = inRange;
                }

                if (inRange)
                {
                    var ev = Schedule<PlayerEnemyCollision>();
                    ev.player = _cachedPlayer;
                    ev.enemy = this;
                    ev.dyAtCollision = dy;
                }
            }
        }

        bool _diagWasIntersecting;

        void OnDrawGizmos()
        {
            // BT5-Dev #15 진단 — Scene 영역 시각화 (Editor에서만 표시)
            if (Application.isPlaying && spriteRenderer != null)
            {
                Gizmos.color = Color.red;
                Gizmos.DrawWireCube(VisualBounds.center, VisualBounds.size);
            }
            if (Application.isPlaying && _collider != null)
            {
                Gizmos.color = Color.yellow;
                Gizmos.DrawWireCube(_collider.bounds.center, _collider.bounds.size);
            }
        }

    }
}