using System;
using Continentis.MainGame.Character;
using Cysharp.Threading.Tasks;
using Lean.Pool;
using SLSUtilities.General;
using SLSUtilities.UModAssistance;
using UnityEngine;

namespace Continentis.MainGame.Commands
{
    public class Cmd_SpawnVFX : CommandBase
    {
        private readonly VisualEffectBase vfxPrefab;
        private readonly CharacterBase target;
        private readonly Vector3 fixedPosition;
        private readonly Vector3 positionOffset;
        private readonly bool willWaitUntilFinish;
        private readonly float overrideDuration;

        /// <summary>在目标角色位置生成 VFX。</summary>
        public Cmd_SpawnVFX(string vfxID, CharacterBase target, Vector3 positionOffset = default,
            bool willWaitUntilFinish = false, float overrideDuration = -1f)
        {
            this.vfxPrefab = ModManager.GetAsset<GameObject>(vfxID).GetComponent<VisualEffectBase>();
            this.target = target;
            this.positionOffset = positionOffset;
            this.fixedPosition = Vector3.zero;
            this.willWaitUntilFinish = willWaitUntilFinish;
            this.overrideDuration = overrideDuration;
        }

        /// <summary>在世界坐标固定位置生成 VFX。</summary>
        public Cmd_SpawnVFX(string vfxID, Vector3 position = default,
            bool willWaitUntilFinish = false, float overrideDuration = -1f)
        {
            this.vfxPrefab = ModManager.GetAsset<GameObject>(vfxID).GetComponent<VisualEffectBase>();
            this.target = null;
            this.fixedPosition = position;
            this.positionOffset = Vector3.zero;
            this.willWaitUntilFinish = willWaitUntilFinish;
            this.overrideDuration = overrideDuration;
        }

        /// <summary>在目标角色位置生成 VFX（直接传入 Prefab GameObject）。</summary>
        public Cmd_SpawnVFX(GameObject prefab, CharacterBase target, Vector3 positionOffset = default,
            bool willWaitUntilFinish = false, float overrideDuration = -1f)
        {
            this.vfxPrefab = prefab.GetComponent<VisualEffectBase>();
            this.target = target;
            this.positionOffset = positionOffset;
            this.fixedPosition = Vector3.zero;
            this.willWaitUntilFinish = willWaitUntilFinish;
            this.overrideDuration = overrideDuration;
        }

        /// <summary>在世界坐标固定位置生成 VFX（直接传入 Prefab GameObject）。</summary>
        public Cmd_SpawnVFX(GameObject prefab, Vector3 position = default,
            bool willWaitUntilFinish = false, float overrideDuration = -1f)
        {
            this.vfxPrefab = prefab.GetComponent<VisualEffectBase>();
            this.target = null;
            this.fixedPosition = position;
            this.positionOffset = Vector3.zero;
            this.willWaitUntilFinish = willWaitUntilFinish;
            this.overrideDuration = overrideDuration;
        }

        protected override async UniTask ExecuteAsync(CommandContext outerContext)
        {
            if (vfxPrefab == null)
            {
                Debug.LogWarning("[Cmd_SpawnVFX] VFX Prefab 为空。");
                return;
            }

            Vector3 spawnPosition = target != null
                ? target.characterView.centerPoint.transform.position + positionOffset
                : fixedPosition;

            VisualEffectBase spawnedVFX = LeanPool.Spawn(vfxPrefab, spawnPosition, Quaternion.identity);

            if (!spawnedVFX.isAutoDespawn)
                Debug.LogWarning("[Cmd_SpawnVFX] 生成的 VFX 未设置自动销毁，可能导致内存泄漏。");

            if (willWaitUntilFinish)
            {
                float duration = overrideDuration > 0f ? overrideDuration : spawnedVFX.autoDespawnTime;
                await UniTask.Delay(TimeSpan.FromSeconds(duration));
            }
        }
    }
}