using System;
using System.Collections.Generic;
using AibisDream.Kit;
using DG.Tweening;
using UnityEngine;
using Sequence = DG.Tweening.Sequence;

namespace AibisDream.FixSystem
{
    /// <summary>
    /// 维修系统注册信息
    /// </summary>
    public class RegisteredSystem
    {
        public Type SystemType;
        public Transform Transform;
        public Vector3 OriginalPosition;
        public Vector3 OriginalScale;
        public Vector3 Offset;
    }

    /// <summary>
    /// 维修系统管理器 - 管理面板中央的维修系统切换和视图控制
    /// </summary>
    public class RepairSystemManager : Singleton<RepairSystemManager>
    {
        [Header("位置配置")]
        [Tooltip("面板中央放置位（激活系统位置）")]
        [SerializeField] private Transform centerSlot;

        [Tooltip("屏幕外隐藏位置（非激活系统位置）")]
        [SerializeField] private Transform hiddenSlot;

        [Header("缩放动画")]
        [SerializeField] private float scaleDuration = 0.3f;
        [SerializeField] private Ease scaleEase = Ease.OutBack;

        // 注册的系统字典
        private readonly Dictionary<Type, RegisteredSystem> _registeredSystems = new();

        // 当前激活的系统类型
        private Type _currentSystemType = typeof(BodyModuleSystem);

        private Sequence _activeScaleTween;

        private void OnDisable()
        {
            _registeredSystems.Clear();
        }

        #region 系统注册

        /// <summary>
        /// 注册维修系统到管理器（供系统自注册使用）
        /// </summary>
        public static void Register<T>(T instance) where T : class
        {
            if (instance is not MonoBehaviour mb)
            {
                Debug.LogError($"[RepairSystemManager] 注册失败：{typeof(T).Name} 不是 MonoBehaviour");
                return;
            }

            var type = typeof(T);
            var system = new RegisteredSystem
            {
                SystemType = type,
                Transform = mb.transform,
                OriginalPosition = mb.transform.position,
                OriginalScale = mb.transform.localScale,
                Offset = Vector3.zero
            };

            if (Instance != null)
            {
                Instance._registeredSystems[type] = system;
            }

            Debug.Log($"[RepairSystemManager] 注册系统: {type.Name}");
        }

        #endregion

        #region 系统切换

        /// <summary>
        /// 切换到指定类型的维修系统
        /// </summary>
        public void SwitchSystem<T>() where T : class
        {
            SwitchSystem(typeof(T));
        }

        /// <summary>
        /// 切换到指定类型的维修系统
        /// </summary>
        public void SwitchSystem(Type systemType)
        {
            if (_currentSystemType == systemType) return;

            if (!_registeredSystems.TryGetValue(systemType, out var targetSystem))
            {
                Debug.LogError($"[RepairSystemManager] 未找到系统: {systemType.Name}");
                return;
            }

            PerformSwitch(targetSystem);
        }

        private void PerformSwitch(RegisteredSystem targetSystem)
        {
            // 停止当前动画
            _activeScaleTween?.Kill();
            _activeScaleTween = null;

            // 获取当前系统
            RegisteredSystem currentSystem = null;
            if (_currentSystemType != null)
            {
                _registeredSystems.TryGetValue(_currentSystemType, out currentSystem);
            }

            // 重置当前系统的缩放和偏移
            if (currentSystem != null)
            {
                currentSystem.Transform.localScale = currentSystem.OriginalScale;
            }

            // 位置移动
            if (currentSystem != null)
            {
                currentSystem.Transform.position = hiddenSlot.position + currentSystem.Offset;
            }
            targetSystem.Transform.position = centerSlot.position + targetSystem.Offset;

            _currentSystemType = targetSystem.SystemType;
        }

        #endregion

        #region 缩放控制

        /// <summary>
        /// 缩放当前激活的系统
        /// </summary>
        /// <param name="targetScale">目标缩放倍数（相对于原始大小）</param>
        /// <param name="anchor">锚点世界坐标，null则使用物体中心</param>
        public Tween ScaleCurrentSystem(float targetScale, Vector3? anchor = null)
        {
            if (_currentSystemType == null) return null;
            if (!_registeredSystems.TryGetValue(_currentSystemType, out var system)) return null;

            _activeScaleTween?.Kill();

            // 参数初始化
            var transform = system.Transform;
            var finalScale = system.OriginalScale * targetScale;
            var anchorPos = (2*transform.position - anchor) ?? transform.position;
            // 计算偏移量
            system.Offset = anchorPos - transform.position;

            // 并行执行缩放和位移
            var sequence = DOTween.Sequence();
            sequence.Join(transform.DOScale(finalScale, scaleDuration).SetEase(scaleEase));
            sequence.Join(transform.DOMove(anchorPos, scaleDuration).SetEase(scaleEase));

            _activeScaleTween = sequence;
            return sequence;
        }

        /// <summary>
        /// 恢复当前系统的原始缩放
        /// </summary>
        public void ResetCurrentSystemScale()
        {
            if (_currentSystemType == null) return;
            if (!_registeredSystems.TryGetValue(_currentSystemType, out var system)) return;

            _activeScaleTween?.Kill();

            var transform = system.Transform;

            // 恢复到中心位置，减去之前记录的偏移量来还原位置
            var targetPosition = centerSlot.position - system.Offset;
            var sequence = DOTween.Sequence();
            sequence.Join(transform.DOScale(system.OriginalScale, scaleDuration).SetEase(scaleEase));
            sequence.Join(transform.DOMove(targetPosition, scaleDuration).SetEase(scaleEase));

            _activeScaleTween = sequence;
        }

        #endregion

        #region 查询方法

        /// <summary>
        /// 获取当前激活的系统类型
        /// </summary>
        public Type GetCurrentSystemType()
        {
            return _currentSystemType;
        }

        /// <summary>
        /// 获取当前激活系统的 Transform
        /// </summary>
        public Transform GetCurrentSystemTransform()
        {
            if (_currentSystemType == null) return null;
            return _registeredSystems.TryGetValue(_currentSystemType, out var system)
                ? system.Transform
                : null;
        }

        /// <summary>读档：按已注册类型名切换中央维修视图（无动画）。</summary>
        public void RestoreSystemType(string typeName)
        {
            Type targetType = typeof(BodyModuleSystem);

            if (!string.IsNullOrEmpty(typeName))
            {
                Type matched = null;
                foreach (var kv in _registeredSystems)
                {
                    if (kv.Key.Name == typeName)
                    {
                        matched = kv.Key;
                        break;
                    }
                }

                if (matched != null)
                {
                    targetType = matched;
                }
                else
                {
                    Debug.LogWarning($"[RepairSystemManager] 未找到已注册系统: {typeName}，保持当前类型。");
                    return;
                }
            }

            SwitchSystem(targetType);
        }

        #endregion
    }
}