using AibisDream.Framework;
using AibisDream.Kit;
using UnityEngine;
using UnityEngine.UI;

namespace AibisDream
{
    public class CursorManager : Singleton<CursorManager>
    {
        [SerializeField] private GameObject border;

        [Header("指针图片")] public Sprite defaultCursor;
        public Sprite nextTalk, talking, option, interactive, holding, rotating, disable;

        private Image _cursor;
        private Object _interactionCursorOwner;
        private CursorStateEnum _interactionCursorState;
        private bool _cursorVisible = true;

        private void Start()
        {
            border.SetActive(true);
            InitRefs();
#if UNITY_ANDROID || UNITY_IOS
            _cursor.gameObject.SetActive(false);
#else
            InitCursor();
#endif
        }

        public void SetCursorVisible(bool visible)
        {
#if UNITY_ANDROID || UNITY_IOS
            return;
#endif

            _cursorVisible = visible;
            ApplyCursorVisibility();
        }

        private void ApplyCursorVisibility()
        {
            if (_cursor != null)
            {
                _cursor.gameObject.SetActive(_cursorVisible);
            }

            // 隐藏自定义指针图时显示系统真实指针，便于录制等场景定位鼠标
            Cursor.visible = !_cursorVisible;
        }

        private void InitCursor()
        {
            Cursor.visible = false;
            _cursor.sprite = defaultCursor;
        }

        private void InitRefs()
        {
            _cursor = transform.Find("Cursor").GetComponent<Image>();
        }

        private void LateUpdate()
        {
#if !(UNITY_ANDROID || UNITY_IOS)
            // // 将虚拟指针与鼠标位置同步
            // RectTransformUtility.ScreenPointToLocalPointInRectangle(_cursorCanvas, Input.mousePosition,
            //     CameraKit.Instance.uiCamera, out var worldPos);

            // 判断当前要用什么样的指针
            _cursor.rectTransform.position = Input.mousePosition;

            var cursorState = CheckCursorState();
            _cursor.sprite = GetCursorSprite(cursorState);
#endif
        }

        private CursorStateEnum CheckCursorState()
        {
            var gameState = GameManager.Session;

            if (gameState.Phase != GameSessionPhase.Playing || gameState.IsPaused)
            {
                // 非游戏中显示默认指针
                return CursorStateEnum.Default;
            }
            else if (UIManager.Instance.IsOverRegion("MainUI"))
            {
                // 游戏中鼠标移至右上角Main Panel时显示默认指针
                return CursorStateEnum.Default;
            }
            else if (gameState.IsDialogueActive)
            {
                // 处理对话中的指针
                var dialogState = DialogController.Instance.GetDialogState();
                return HandleDialogState(dialogState);
            }
            else
            {
                // 非对话处理指针交互
                if (_interactionCursorOwner != null)
                {
                    return _interactionCursorState;
                }

                var triggerEnum = EventSystemEx.Instance.GetPointerState();
                return HandleDraggingState(triggerEnum);
            }
        }

        private CursorStateEnum HandleDialogState(LineSyncState dialogState)
        {
            return dialogState switch
            {
                LineSyncState.Default => CursorStateEnum.Default,
                LineSyncState.PlayText => CursorStateEnum.PlayText,
                LineSyncState.AdvanceDelay => CursorStateEnum.PlayText,
                LineSyncState.WaitForAdvance => CursorStateEnum.WaitForAdvance,
                LineSyncState.WaitForAutoAdvance => CursorStateEnum.WaitForAdvance,
                LineSyncState.Advanced => CursorStateEnum.Default,
                LineSyncState.InOption => CursorStateEnum.InOption,
                _ => CursorStateEnum.Default,
            };
        }

        private CursorStateEnum HandleDraggingState(TriggerEnum triggerEnum)
        {
            return triggerEnum switch
            {
                TriggerEnum.Dragging => CursorStateEnum.Dragging,
                TriggerEnum.PointerOver => CursorStateEnum.PointerOver,
                _ => CursorStateEnum.Default,
            };
        }

        private Sprite GetCursorSprite(CursorStateEnum cursorState)
        {
            return cursorState switch
            {
                CursorStateEnum.Default => defaultCursor,
                CursorStateEnum.PlayText => talking,
                CursorStateEnum.WaitForAdvance => nextTalk,
                CursorStateEnum.InOption => option,
                CursorStateEnum.Dragging => holding,
                CursorStateEnum.PointerOver => interactive,
                CursorStateEnum.Rotating => rotating != null ? rotating : interactive,
                _ => defaultCursor,
            };
        }

        public void SetInteractionCursor(Object owner, CursorStateEnum state)
        {
            if (owner == null) return;
            _interactionCursorOwner = owner;
            _interactionCursorState = state;
        }

        public void ClearInteractionCursor(Object owner)
        {
            if (owner != null && _interactionCursorOwner != owner) return;
            _interactionCursorOwner = null;
            _interactionCursorState = CursorStateEnum.Default;
        }
    }

    public enum CursorStateEnum
    {
        Default,
        PlayText,
        WaitForAdvance,
        InOption,
        Dragging,
        PointerOver,
        Rotating
    }
}