using UnityEngine;
using UnityEngine.Events;
using DG.Tweening;
using System.Collections;

namespace AibisDream.MiniGame.HuoShan
{
    /// <summary>
    /// 发条控制器 - 实现发条的拖拽旋转交互
    /// 功能：拖拽旋转，最大260°，缓慢回位，触发事件
    /// </summary>
    public class CrankController : MonoBehaviour
    {
        [Header("发条配置")]
        [Tooltip("最大旋转角度（度）")]
        [SerializeField] private float maxRotationAngle = 260f;

        [Tooltip("回位速度（度/秒）")]
        [SerializeField] private float returnSpeed = 45f;

        [Tooltip("触发事件的最小角度（度）")]
        [SerializeField] private float triggerAngle = 240f;

        [Tooltip("拖拽阻力，值越大越难拖动")]
        [SerializeField] private float dragResistance = 0.1f;

        [Tooltip("是否自动返回初始位置")]
        [SerializeField] private bool autoReturn = true;

        [Header("事件" )]
        [Tooltip("发条达到最大角度并释放时触发")]
        public UnityEvent onCrankComplete;

        [Tooltip("发条旋转时触发（参数：当前角度0-1）")]
        public UnityEvent<float> onCrankRotate;

        [Tooltip("发条开始拖拽时触发")]
        public UnityEvent onCrankStartDrag;

        [Header("视觉反馈")]
        [Tooltip("发条旋转的中心Transform")]
        [SerializeField] private Transform crankTransform;

        [Tooltip("拖拽时的缩放效果")]
        [SerializeField] private float dragScale = 1.05f;

        [Tooltip("缩放动画时长")]
        [SerializeField] private float scaleDuration = 0.1f;

        private Vector3 _dragStartPosition;
        private float _currentRotation = 0f;
        private bool _isDragging = false;
        private bool _hasTriggered = false;
        private Camera _mainCamera;
        private Vector3 _initialScale;
        private Tweener _scaleTween;
        private Tweener _returnTween;

        #region 生命周期

        private void Awake()
        {
            _mainCamera = Camera.main;
            if (crankTransform != null)
            {
                _initialScale = crankTransform.localScale;
            }
            else
            {
                _initialScale = transform.localScale;
                crankTransform = transform;
            }
        }

        private void OnEnable()
        {
            ResetCrank();
        }

        private void Update()
        {
            HandleMouseInput();
            HandleReturn();
        }

        #endregion

        #region 输入处理

        private void HandleMouseInput()
        {
            if (Input.GetMouseButtonDown(0))
            {
                Ray ray = _mainCamera.ScreenPointToRay(Input.mousePosition);
                RaycastHit2D hit = Physics2D.Raycast(ray.origin, ray.direction);

                if (hit.collider != null && hit.collider.gameObject == gameObject)
                {
                    StartDrag();
                }
            }

            if (_isDragging)
            {
                if (Input.GetMouseButton(0))
                {
                    ContinueDrag();
                }
                else if (Input.GetMouseButtonUp(0))
                {
                    EndDrag();
                }
            }
        }

        #endregion

        #region 拖拽逻辑

        private void StartDrag()
        {
            _isDragging = true;
            _dragStartPosition = Input.mousePosition;
            _hasTriggered = false;

            if (_returnTween != null)
            {
                _returnTween.Kill();
                _returnTween = null;
            }

            // 拖拽缩放效果
            if (_scaleTween != null) _scaleTween.Kill();
            _scaleTween = crankTransform.DOScale(_initialScale * dragScale, scaleDuration)
                .SetEase(Ease.OutQuad);

            onCrankStartDrag?.Invoke();
        }

        private void ContinueDrag()
        {
            // 获取鼠标相对于中心的角度
            Vector3 screenCenter = _mainCamera.WorldToScreenPoint(crankTransform.position);
            Vector3 currentMousePos = Input.mousePosition;

            // 计算角度
            float angle = Mathf.Atan2(currentMousePos.y - screenCenter.y, currentMousePos.x - screenCenter.x) * Mathf.Rad2Deg;

            // 将角度转换为0-360范围
            if (angle < 0) angle += 360f;

            // 限制最大旋转角度
            angle = Mathf.Clamp(angle, 0f, maxRotationAngle);

            // 应用阻力效果
            float targetRotation = angle * (1f - dragResistance);
            _currentRotation = Mathf.Lerp(_currentRotation, targetRotation, Time.deltaTime * 10f);

            // 更新旋转
            crankTransform.localRotation = Quaternion.Euler(0f, 0f, -_currentRotation);

            // 触发旋转事件
            float normalizedRotation = _currentRotation / maxRotationAngle;
            onCrankRotate?.Invoke(normalizedRotation);

            // 检查是否达到触发角度
            if (_currentRotation >= triggerAngle && !_hasTriggered)
            {
                _hasTriggered = true;
                // 触发完成事件将在释放时调用
            }
        }

        private void EndDrag()
        {
            _isDragging = false;

            // 恢复缩放
            if (_scaleTween != null) _scaleTween.Kill();
            _scaleTween = crankTransform.DOScale(_initialScale, scaleDuration)
                .SetEase(Ease.OutQuad);

            // 触发完成事件
            if (_hasTriggered && _currentRotation >= triggerAngle)
            {
                onCrankComplete?.Invoke();
            }
        }

        #endregion

        #region 回位逻辑

        private void HandleReturn()
        {
            if (!_isDragging && autoReturn && _currentRotation > 0f)
            {
                if (_returnTween == null)
                {
                    float returnDuration = _currentRotation / returnSpeed;
                    _returnTween = DOTween.To(
                        () => _currentRotation,
                        value => {
                            _currentRotation = value;
                            crankTransform.localRotation = Quaternion.Euler(0f, 0f, -_currentRotation);
                            float normalizedRotation = _currentRotation / maxRotationAngle;
                            onCrankRotate?.Invoke(normalizedRotation);
                        },
                        0f,
                        returnDuration
                    ).SetEase(Ease.OutCubic).OnComplete(() => {
                        _currentRotation = 0f;
                        _returnTween = null;
                    });
                }
            }
        }

        #endregion

        #region 公共方法

        public void ResetCrank()
        {
            if (_returnTween != null)
            {
                _returnTween.Kill();
                _returnTween = null;
            }

            _isDragging = false;
            _hasTriggered = false;
            _currentRotation = 0f;

            if (crankTransform != null)
            {
                crankTransform.localRotation = Quaternion.identity;
                crankTransform.localScale = _initialScale;
            }
        }

        /// <summary>
        /// 手动旋转到指定角度（用于动画或程序化控制）
        /// </summary>
        public void RotateTo(float angle, float duration = 0.5f)
        {
            angle = Mathf.Clamp(angle, 0f, maxRotationAngle);

            if (_returnTween != null)
            {
                _returnTween.Kill();
                _returnTween = null;
            }

            DOTween.To(
                () => _currentRotation,
                value => {
                    _currentRotation = value;
                    crankTransform.localRotation = Quaternion.Euler(0f, 0f, -_currentRotation);
                    float normalizedRotation = _currentRotation / maxRotationAngle;
                    onCrankRotate?.Invoke(normalizedRotation);
                },
                angle,
                duration
            ).SetEase(Ease.OutCubic);
        }

        /// <summary>
        /// 获取当前旋转角度（0-1标准化）
        /// </summary>
        public float GetNormalizedRotation()
        {
            return _currentRotation / maxRotationAngle;
        }

        /// <summary>
        /// 获取当前旋转角度（度）
        /// </summary>
        public float GetCurrentAngle()
        {
            return _currentRotation;
        }

        /// <summary>
        /// 是否正在拖拽中
        /// </summary>
        public bool IsDragging => _isDragging;

        /// <summary>
        /// 是否已达到触发角度
        /// </summary>
        public bool HasTriggered => _hasTriggered;

        #endregion
    }
}