using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using System.Collections.Generic;
using AibisDream;

public class MouseCursorManager : MonoBehaviour
{
    public static MouseCursorManager Instance { get; private set; }

    [Header("Cursor Images")]
    public Sprite dialogueCursorSprite;
    public Sprite handCursorSprite;      // 手的图标
    public Sprite searchCursorSprite;    // 搜索图标
    public Sprite defaultCursorSprite;  

    public Canvas dialogueCanvas;        // 对话Canvas
    public Image cursorImage;            // 用于显示自定义光标的Image

    private bool isInDialogue = false;   // 是否处于对话状态
    private bool isDraggingPlug = false; // 是否正在拖拽Plug
    private bool isUsingTool = false;    // 是否处于使用工具状态

    private void Awake()
    {
        if (Instance != null && Instance != this)
        {
            Destroy(gameObject);
            return;
        }

        Instance = this;
        DontDestroyOnLoad(gameObject);
    }

    private void Start()
    {
        ResetCursor();          // 设置为默认光标
    }

    private void Update()
    {
        cursorImage.transform.position = Input.mousePosition;
        UpdateCursorState();

        // 检测点击事件
        if (Input.GetMouseButtonDown(0))
        {
            HandleClick();
        }
    }

    private void UpdateCursorState()
    {
        if (DialogController.Instance.IsTalking)
        {
            SetCursor(dialogueCursorSprite);
            dialogueCanvas.sortingOrder = 1000;   // 确保对话窗口在最前
            dialogueCanvas.overrideSorting = true;
            dialogueCanvas.GetComponent<GraphicRaycaster>().blockingMask = LayerMask.GetMask("Everything");
        }
        else
        {
            dialogueCanvas.overrideSorting = false;
            dialogueCanvas.GetComponent<GraphicRaycaster>().blockingMask = LayerMask.GetMask("Nothing");

            if (IsHoveringOverDragItem())
            {
                SetCursor(handCursorSprite);
            }
            else if (IsHoveringOverDialogueItem())
            {
                SetCursor(searchCursorSprite, true); // 使用翻转光标
            }
            else
            {
                ResetCursor();
            }
        }
    }

    private bool IsHoveringOverDialogueItem()
    {
        if (EventSystem.current.IsPointerOverGameObject())
        {
            PointerEventData pointerData = new PointerEventData(EventSystem.current) { position = Input.mousePosition };
            var results = new List<RaycastResult>();
            EventSystem.current.RaycastAll(pointerData, results);

            foreach (var result in results)
            {
                if (result.gameObject.CompareTag("DialogueObject")) // 物体需添加 DialogueObject 标签
                {
                    return true;
                }
            }
        }
        return false;
    }

    private bool IsHoveringOverDragItem()
    {
        if (EventSystem.current.IsPointerOverGameObject())
        {
            PointerEventData pointerData = new PointerEventData(EventSystem.current) { position = Input.mousePosition };
            var results = new List<RaycastResult>();
            EventSystem.current.RaycastAll(pointerData, results);

            foreach (var result in results)
            {
                if (result.gameObject.CompareTag("Dragable")) // 物体需添加 Dragable 标签
                {
                    return true;
                }
            }
        }
        return false;
    }

    // 处理点击事件
    private void HandleClick()
    {
        PointerEventData pointerData = new PointerEventData(EventSystem.current) { position = Input.mousePosition };
        var results = new List<RaycastResult>();
        EventSystem.current.RaycastAll(pointerData, results);

        foreach (var result in results)
        {
            if (result.gameObject.CompareTag("DialogueObject"))
            {
                string dialogueNode =result.gameObject.name+"Dialogue"; // 假设物体名是对话节点
                DialogController.Instance.StartDialogNode(dialogueNode);
                return;
            }
        }
    }

    public void EnterDialogue()
    {
        isInDialogue = true;
    }

    public void ExitDialogue()
    {
        isInDialogue = false;
        ResetCursor();
    }

    public void StartDraggingPlug()
    {
        isDraggingPlug = true;
    }

    public void StopDraggingPlug()
    {
        isDraggingPlug = false;
        ResetCursor();
    }

    public void StartUsingTool()
    {
        isUsingTool = true;
    }

    public void StopUsingTool()
    {
        isUsingTool = false;
        ResetCursor();
    }

    public void SetCursor(Sprite cursorSprite, bool flip = false)
    {
        if (cursorSprite != null)
        {
            cursorImage.sprite = cursorSprite;
            cursorImage.enabled = true;
            cursorImage.rectTransform.localScale = new Vector3(flip ? -1 : 1, 1, 1);
        }
    }

    public void ResetCursor()
    {
        cursorImage.sprite = defaultCursorSprite;
        cursorImage.rectTransform.localScale = Vector3.one; // 恢复为不翻转的默认状态
    }
}