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

namespace EerieVillage.Skills.Effectors
{
    /// <summary>
    /// 레이저 Effector — FX_Dragonfire 레이저.
    /// PD 지시 (2026-05-13):
    ///   - 3초마다 발사 (BaseCooldown 3)
    ///   - 캐릭터 위치에서 정면 방향 발사
    ///   - 40프레임 이후부터 이펙트 소멸 시점까지 0.5초 간격 5 데미지
    ///   - 경로 상 긴 범위 내 적 (HitboxSize.x=길이·HitboxSize.y=폭)
    /// </summary>
    public class LaserSpawner : IEffector
    {
        public void Trigger(ActiveSkillRuntime runtime, PlayerSkillInventory inventory)
        {
            var data = runtime.ActiveData;
            // PD 지시 2026-05-13 분리 — OffsetDistance(forwardDir) = 히트박스만·OffsetXY = 이펙트만
            Vector2 facing = Vector2.right;
            var pc = inventory.GetComponent<PlayerController>();
            if (pc != null) facing = pc.Facing;
            // PD 지시 2026-05-13 — FxRotation 은 이펙트(시각) 전용. 박스(판정) 은 facing 만 반영.
            float baseAngle = Mathf.Atan2(facing.y, facing.x) * Mathf.Rad2Deg;   // 박스 회전 = facing 만 (좌/우)
            float fxAngle   = baseAngle + data.FxRotation;                        // 이펙트 회전 = facing + FxRotation
            Vector2 boxForward = facing.normalized;                               // 박스 진행 방향 = facing (FxRotation 미적용)
            Vector2 playerPos = inventory.transform.position;
            Vector2 fxPos     = playerPos + data.OffsetXY;                        // 이펙트 위치

            // 이펙트 spawn — fxPos·HitFxScale·facing+FxRotation 적용
            GameObject fx = null;
            if (data.OnHitFxPrefab != null)
            {
                fx = Object.Instantiate(data.OnHitFxPrefab, (Vector3)fxPos, Quaternion.Euler(0f, 0f, fxAngle));
                fx.hideFlags = HideFlags.DontSave;
                fx.transform.SetParent(inventory.transform, true);
                fx.transform.localScale *= data.HitFxScale;
            }

            float fxLifetime = GetFxLifetime(fx);
            // PD 지시 2026-05-13 — fx AutoDestroy 누락 fix·safety cap 5초 (잔상 차단)
            if (fx != null) Object.Destroy(fx, Mathf.Min(fxLifetime + 0.2f, 5f));
            int damage = Mathf.Max(data.BaseDamage, 1);
            float length = Mathf.Max(data.HitboxSize.x, 1f);
            float width  = Mathf.Max(data.HitboxSize.y, 0.5f);

            // 박스 = Player 자식 부착·facing 만 회전 (FxRotation 미적용)
            var boxGo = new GameObject("LaserHitbox_Debug");
            boxGo.hideFlags = HideFlags.DontSave;
            boxGo.transform.SetParent(inventory.transform, false);
            float lpx = inventory.transform.lossyScale.x != 0f ? Mathf.Abs(inventory.transform.lossyScale.x) : 1f;
            float lpy = inventory.transform.lossyScale.y != 0f ? Mathf.Abs(inventory.transform.lossyScale.y) : 1f;
            // PD 지시 2026-05-13 — OffsetDistance.x 는 facing sign 반영 (좌/우 반전)
            float signX = facing.x < 0f ? -1f : 1f;
            float localX = (signX * data.OffsetDistance.x + boxForward.x * length * 0.5f) / lpx;
            float localY = (data.OffsetDistance.y + boxForward.y * length * 0.5f) / lpy;
            boxGo.transform.localPosition = new Vector3(localX, localY, 0f);
            boxGo.transform.localRotation = Quaternion.Euler(0f, 0f, baseAngle);  // facing 만
            boxGo.transform.localScale = new Vector3(length / lpx, width / lpy, 1f);
            var sr = boxGo.AddComponent<SpriteRenderer>();
            sr.sprite = HitboxDebug.GetWhiteSprite();
            sr.color = new Color(1f, 0f, 0f, 0.35f);
            sr.sortingOrder = 100;
            sr.enabled = HitboxDebug.ShowDebugVisuals;
            Object.Destroy(boxGo, fxLifetime + 0.2f);

            // PD 지시 2026-05-13 — DamageFrameDelay·반복 피해 영역 정합 (Player 영역 매 hit 시 영역 영역)
            inventory.StartCoroutine(LaserFixedHitDamageCoroutine(inventory, fx, data, damage, length, width));
        }

        static IEnumerator LaserFixedHitDamageCoroutine(PlayerSkillInventory inventory, GameObject fx, ActiveSkillData data, int damage, float length, float width)
        {
            for (int i = 0; i < data.DamageFrameDelay; i++) yield return null;
            if (fx == null || inventory == null) yield break;
            ApplyLaserDamage(inventory, data, damage, length, width);

            if (data.EnableRepeatDamage)
            {
                int remaining = Mathf.Max(0, data.MaxHitCount - 1);
                int interval = Mathf.Max(1, data.RepeatFrameInterval);
                for (int hit = 0; hit < remaining; hit++)
                {
                    for (int i = 0; i < interval; i++) yield return null;
                    if (fx == null || inventory == null) yield break;
                    ApplyLaserDamage(inventory, data, damage, length, width);
                }
            }
        }

        // PD 지시 2026-05-13 — 판정 방향 = facing 만 (FxRotation 은 시각 전용·박스 미적용)
        static void ApplyLaserDamage(PlayerSkillInventory inventory, ActiveSkillData data, int damage, float length, float width)
        {
            if (inventory == null) return;
            Vector2 facing = Vector2.right;
            var pc = inventory.GetComponent<PlayerController>();
            if (pc != null) facing = pc.Facing;
            Vector2 forwardDir = facing.normalized;  // 판정 진행 방향 = facing 만
            float signX = facing.x < 0f ? -1f : 1f;  // OffsetDistance.x 좌/우 반전
            Vector2 origin = (Vector2)inventory.transform.position
                           + new Vector2(signX * data.OffsetDistance.x, data.OffsetDistance.y);

            var enemies = Object.FindObjectsByType<EnemyController>(FindObjectsSortMode.None);
            int hits = 0;
            foreach (var e in enemies)
            {
                if (e == null) continue;
                Vector2 toEnemy = (Vector2)e.transform.position - origin;
                float along = Vector2.Dot(toEnemy, forwardDir);
                if (along < 0f || along > length) continue;
                Vector2 perpVec = toEnemy - forwardDir * along;
                if (perpVec.magnitude > width * 0.5f) continue;

                var h = e.GetComponent<Health>();
                if (h == null || !h.IsAlive) continue;
                h.DecrementBypassInvulnWithHit(damage);
                hits++;
                if (!h.IsAlive) Schedule<EnemyDeath>().enemy = e;
            }
        }

        static float GetFxLifetime(GameObject fxGo)
        {
            if (fxGo == null) return 2f;
            var psList = fxGo.GetComponentsInChildren<ParticleSystem>(true);
            float max = 0f;
            foreach (var ps in psList)
            {
                var main = ps.main;
                float t = main.duration + main.startLifetime.constantMax;
                if (t > max) max = t;
            }
            return max > 0.1f ? max : 2f;
        }
    }
}