using System;
using Framework;
using Obfuz;
using PhxhSDK;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.InputSystem;
using UnityEngine.InputSystem.Controls;
using UnityEngine.InputSystem.EnhancedTouch;
using UnityEngine.InputSystem.UI;
using Touch = UnityEngine.InputSystem.EnhancedTouch.Touch;


/// <summary>
/// 旧版输入管理器，已被更灵活的基于InputInterpreter的输入系统替代
/// </summary>
[Obsolete("InputManager已被废弃，请使用新的InputInterpreter架构替代。参见Framework.InputInterpreter")]
[ObfuzIgnore]
public class InputManager : SingletonMono<InputManager>
{
    /// <summary>
    /// 是否激活
    /// </summary>
    public bool IsEnable;

    public delegate void OnFingerMoveEvent(Vector2 delta);

    public delegate void OnFingerUpEvent(Vector2 screenPosition);

    public delegate void OnFingersMoveEvent(float delta);

    public delegate void OnAnyClickEvent();

    public OnFingerMoveEvent OnFingerMove;
    public OnFingerMoveEvent OnFingerMoveUI;

    public OnFingerUpEvent OnFingerUp;
    public OnFingerUpEvent OnFingerUpUI;
    public OnFingerUpEvent OnClick;
    /// <summary>
    /// 任意屏幕点击
    /// </summary>
    public OnAnyClickEvent OnAnyClick;

    public OnFingersMoveEvent OnFingersMove;


    private bool handledThisFrame;
    
    private bool isOverUI = false;

    public bool IsOverUI => isOverUI;


# if UNITY_STANDALONE || UNITY_EDITOR
    private float moveDelta = 2f;
    private bool isMousePressedLastFrame;
    private bool isGuidePressLastFrame;
    private bool isMouseMovedSincePressed;
    private Vector2 lastMousePosition;
    private ButtonControl mouseButtonAsFinger;
    private bool isMosuePressUI;
#endif

    private void Awake()
    {
        IsEnable = true;
        DontDestroyOnLoad(gameObject);
        EventSystem eventSystem = FindObjectOfType<EventSystem>();
        if (null == eventSystem)
        {
            DebugUtil.Log($"没有EventSystem，创建！");
            GameObject go = new()
            {
                name = "EventSystem"
            };
            go.AddComponent<InputSystemUIInputModule>();
            eventSystem = go.AddComponent<EventSystem>();
            DontDestroyOnLoad(go);
            return;
        }

        DontDestroyOnLoad(eventSystem.gameObject);
    }

    private void OnEnable()
    {
        EnhancedTouchSupport.Enable();

        Touch.onFingerMove += _OnFingerMove;
        Touch.onFingerUp += _OnFingerUp;

# if UNITY_STANDALONE || UNITY_EDITOR
        mouseButtonAsFinger = Mouse.current.leftButton;
#endif
    }


    private void OnDisable()
    {
        Touch.onFingerMove -= _OnFingerMove;
        Touch.onFingerUp -= _OnFingerUp;

        EnhancedTouchSupport.Disable();
    }

    

    private void Update()
    {
        if (!IsEnable)
            return;

        isOverUI = IsPointerOverUI();
        //CheckIsBackKeyDown();

#if UNITY_STANDALONE || UNITY_EDITOR
        if (isGuidePressLastFrame && !mouseButtonAsFinger.isPressed)
            OnAnyClick?.Invoke();

        isGuidePressLastFrame = mouseButtonAsFinger.isPressed;

        if (IsPointerOverUI() && mouseButtonAsFinger.isPressed && !isMousePressedLastFrame)
            isMosuePressUI = true;

        if (!IsPointerOverUI() && !mouseButtonAsFinger.isPressed)
            isMosuePressUI = false;

        var currentMouse = Mouse.current;
        if (isMousePressedLastFrame && mouseButtonAsFinger.isPressed)
        {
            var delta = currentMouse.position.ReadValue() - lastMousePosition;

            isMouseMovedSincePressed |= delta.sqrMagnitude > float.Epsilon;

            if (IsPointerOverUI() || isMosuePressUI)
                OnFingerMoveUI?.Invoke(delta);
            else
                OnFingerMove?.Invoke(delta);
        }

        if (!IsPointerOverUI() && !isMosuePressUI)
        {
            if (isMousePressedLastFrame && !mouseButtonAsFinger.isPressed)
            {
                if (!isMouseMovedSincePressed)
                {
                    OnClick?.Invoke(currentMouse.position.ReadValue());
                }

                OnFingerUp?.Invoke(currentMouse.position.ReadValue());
                isMouseMovedSincePressed = false;
            }
        }

        if (IsPointerOverUI())
        {
            if (isMousePressedLastFrame && !mouseButtonAsFinger.isPressed)
            {
                OnFingerUpUI?.Invoke(currentMouse.position.ReadValue());
                isMouseMovedSincePressed = false;
            }
        }

        // cache mouse state for next frame

        isMousePressedLastFrame = mouseButtonAsFinger.isPressed;

        if (isMousePressedLastFrame)
            lastMousePosition = currentMouse.position.ReadValue();

        if (Mouse.current.scroll.ReadValue().y != 0)
        {
            OnFingersMove?.Invoke(Mouse.current.scroll.ReadValue().y);
        }

        if (Keyboard.current.aKey.isPressed)
        {
            OnFingerMove?.Invoke(new Vector2(moveDelta, 0));
        }

        if (Keyboard.current.dKey.isPressed)
        {
            OnFingerMove?.Invoke(new Vector2(-moveDelta, 0));
        }

        if (Keyboard.current.wKey.isPressed)
        {
            OnFingerMove?.Invoke(new Vector2(0, -moveDelta));
        }

        if (Keyboard.current.sKey.isPressed)
        {
            OnFingerMove?.Invoke(new Vector2(0, moveDelta));
        }
#endif
    }

    private void LateUpdate()
    {
        handledThisFrame = false;
    }


# if UNITY_STANDALONE || UNITY_EDITOR
    public bool IsLeftButton(int buttonIndex)
    {
        return buttonIndex == 1;
    }

    public bool IsRightButton(int buttonIndex)
    {
        return buttonIndex == 2;
    }
#endif


    public void SetHandledThisFrame()
    {
        handledThisFrame = true;
    }

    public bool HandledThisFrame()
    {
        return handledThisFrame;
    }

    public bool HasTouch()
    {
#if UNITY_EDITOR || UNITY_STANDALONE
        return mouseButtonAsFinger?.isPressed ?? false;
#else
        return Touch.activeTouches.Count > 0;
#endif
    }

    public Vector2 GetTouchPosition()
    {
#if UNITY_EDITOR || UNITY_STANDALONE
        return Mouse.current?.position.ReadValue() ?? Vector2.zero;
#else
        if (Touch.activeTouches.Count > 0)
        {
            return Touch.activeTouches[0].screenPosition;
        }
        if (Mouse.current != null)
        {
            return Mouse.current.position.ReadValue();
        }
        return Vector2.zero;
#endif
    }

    private void _OnFingerUp(Finger finger)
    {
        var touch = Touch.activeTouches[0];
        if (UnityEngine.InputSystem.TouchPhase.Ended == touch.phase)
            OnAnyClick?.Invoke();

        if (isOverUI)
        {
            OnFingerUpUI?.Invoke(touch.screenPosition);
            return;
        }

        if (finger.currentTouch.delta.sqrMagnitude < float.Epsilon)
            OnClick?.Invoke(touch.screenPosition);

        OnFingerUp?.Invoke(touch.screenPosition);
    }

    private Vector2 touch1PrevPos;

    private Vector2 touch2PrevPos;

    private float prevTouchDeltaMag;


    private void _OnFingerMove(Finger finger)
    {
        if (Touch.activeTouches.Count == 1)
        {
            var touch = Touch.activeTouches[0];

            if (touch.phase == UnityEngine.InputSystem.TouchPhase.Moved)
            {
                if (isOverUI)
                {
                    OnFingerMoveUI?.Invoke(touch.delta);
                }
                else
                {
                    OnFingerMove?.Invoke(touch.delta);
                }
            }
        }


        else if (Touch.activeTouches.Count >= 2)

        {
            var touch1 = Touch.activeTouches[0];

            var touch2 = Touch.activeTouches[1];


            if (touch1.phase == UnityEngine.InputSystem.TouchPhase.Moved &&
                touch2.phase == UnityEngine.InputSystem.TouchPhase.Moved)

            {
                var touch1Pos = touch1.screenPosition;

                var touch2Pos = touch2.screenPosition;

                var deltaPos1 = touch1Pos - touch1PrevPos;

                var deltaPos2 = touch2Pos - touch2PrevPos;

                var touchDeltaMag = (touch1Pos - touch2Pos).magnitude;

                var deltaMagnitudeDiff = touchDeltaMag - prevTouchDeltaMag;


                OnFingersMove?.Invoke(deltaMagnitudeDiff);


                touch1PrevPos = touch1Pos;

                touch2PrevPos = touch2Pos;

                prevTouchDeltaMag = touchDeltaMag;
            }

            else if (touch1.phase == UnityEngine.InputSystem.TouchPhase.Began &&
                     touch2.phase == UnityEngine.InputSystem.TouchPhase.Began)

            {
                touch1PrevPos = touch1.screenPosition;

                touch2PrevPos = touch2.screenPosition;

                prevTouchDeltaMag = (touch1PrevPos - touch2PrevPos).magnitude;
            }
        }
    }

    private bool IsPointerOverUI(int pointerId)
    {
        return EventSystem.current.IsPointerOverGameObject(pointerId);
    }


    private bool IsPointerOverUI()
    {
        return EventSystem.current.IsPointerOverGameObject();
    }

    /// <summary>
    /// 检测返回键是否按下
    /// Android: Escape键触发返回
    /// Editor: Escape键模拟Android返回（用于测试）
    /// </summary>
    /// <returns>是否按下了返回键</returns>
    public bool CheckIsBackKeyDown()
    {
#if UNITY_ANDROID || UNITY_EDITOR
        
        if (Input.GetKeyDown(KeyCode.Escape))
        {
            EventManager.Instance.Send(EventManager.EventName.Android_Click_Back);
            return true;
        }
        
#endif
        return false;
    }
}