using System.Collections.Generic;
using System.Runtime.CompilerServices;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.InputSystem;
using UnityEngine.InputSystem.Controls;


public class MoveCamera : Singleton<MoveCamera>
{
    /// <summary>
    /// 카메라 시점 변경 속도
    /// </summary>
    public float CameraRotationSpeed = 4;
    /// <summary>
    /// 마우스 휠 줌 속도
    /// </summary>
    public float ZoomSpeed = 50.0f;

    public float ZoomMoveSpeed = 5f;
    /// <summary>
    /// 줌 최솟값, 작을 수록 확대할 수 있는 수치가 커짐
    /// </summary>
    public float MinZoomValue = 10;
    /// <summary>
    /// 줌 최대값, 클 수록 축소할 수 있는 수치가 커짐
    /// </summary>
    public float MaxZoomValue = 90;
    /// <summary>
    /// 카메라 이동 속도
    /// </summary>
    [Range(1f, 10f)]
    public float CameraMoveSpeed = 4;

  


    /// <summary>
    /// 마우스를 움직였을때의 x,y 좌표값
    /// </summary>
    [SerializeField]
    float mouseY = 0;
    [SerializeField]
    float mouseX = 0;
    //bool mouseOverCanvas = false;

    /// <summary>
    /// 마우스 왼쪽버튼 클릭에 대한 컨트롤
    /// </summary>
    private ButtonControl mouseLeftButton;

   
    //[SerializeField]
    //private float m_CanMoveDistance = 3f;


    [SerializeField]
    /// <summary>
    /// 포인트 이동 시 초기 위치 값 저장
    /// </summary>
    private Vector3 m_CameraInitOffset;

    private Camera m_Camera;

    private float initFieldOfView = 60.0f;
    private float targetFieldOfView = 60.0f;
    public override void Awake()
    {
    
    }
    void Start()
    {

        m_Camera = Camera.main;
        
        mouseLeftButton = Mouse.current.leftButton;


        MouseInitialize(transform);

    }

    void Update()
    {
        CameraInputMove();

        if (mouseLeftButton.isPressed && !IsPointerOverCanvas())
        {


            Cursor.SetCursor(null, Vector2.zero, CursorMode.Auto);


            mouseY += Input.GetAxis("Mouse Y") * CameraRotationSpeed;

            mouseY = Mathf.Clamp(mouseY, -90, 90);
            mouseX += Input.GetAxis("Mouse X") * CameraRotationSpeed;

            transform.localEulerAngles = new Vector3(-mouseY, mouseX, 0);





        }


        float scrollValue = Input.GetAxis("Mouse ScrollWheel") * ZoomSpeed;

        if(scrollValue < 0 && m_Camera.fieldOfView > MinZoomValue)
        {
        targetFieldOfView =     m_Camera.fieldOfView + scrollValue;
        } 
        else  if(scrollValue > 0 && m_Camera.fieldOfView < MaxZoomValue)
        {
            targetFieldOfView = m_Camera.fieldOfView + scrollValue;
        }

        if(Input.GetKeyUp(KeyCode.Mouse2))
        {
            targetFieldOfView = initFieldOfView;
        }

        m_Camera.fieldOfView = Mathf.Lerp(m_Camera.fieldOfView, targetFieldOfView , Time.deltaTime * ZoomMoveSpeed);
    }


    bool IsPointerOverCanvas()
    {
        if (EventSystem.current == null) return false;

        PointerEventData eventData = new PointerEventData(EventSystem.current);
        eventData.position = Input.mousePosition;

        var results = new List<RaycastResult>();
        EventSystem.current.RaycastAll(eventData, results);

        return results.Count > 0;
    }


    public void SetCameraInitOffset(Vector3 pos)
    {
        m_CameraInitOffset = pos;
    }


    float getMouseY(float x)
    {
        if (x > 90)
        {
            if (x > 270)
            { //360도 까지만 있다는 전제하에
                return (x - 360);
            }
            return (180 - (x));
        }
        else if (x < -90)
        {
            if (x < -270)
            {
                return (x + 360);
            }
            return (180 + (x));
        }
        else
        {
            return x;
        }

    }



    public void MouseInitialize(Transform CameraTransform)
    {
        mouseX = CameraTransform.localEulerAngles.y;
        mouseY = -getMouseY(CameraTransform.localEulerAngles.x);
    }

    public void MouseInitialize()
    {
        mouseX = 0;
        mouseY = 0;
    }




    private void CameraInputMove()
    {

        Vector3 directionMovePos(Vector3 direction)
        {
            return direction * CameraMoveSpeed * Time.deltaTime;
        }
        Vector3 movePosition = Vector3.zero;
        if (Input.GetKey(InputManager.Forward)) movePosition += directionMovePos(transform.forward);
        if (Input.GetKey(InputManager.Backword)) movePosition -= directionMovePos(transform.forward);
        if (Input.GetKey(InputManager.Right)) movePosition += directionMovePos(transform.right);
        if (Input.GetKey(InputManager.Left)) movePosition -= directionMovePos(transform.right);
        if (Input.GetKey(InputManager.Up)) movePosition += directionMovePos(transform.up);
        if (Input.GetKey(InputManager.Down)) movePosition -= directionMovePos(transform.up);

        transform.position += movePosition;

        if(transform.position.y < 0)
        {
            movePosition =new Vector3(transform.position.x, 0, transform.position.z);
            transform.position = movePosition; 
        }
    



    }
}