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 ZoomSpeewd = 5000.0f;
    ///// <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 = 60;
    /// <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;


    public override void Awake()
    {
    
    }
    void Start()
    {
        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);





        }



    }


    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 DistanceBasedInteriorDisplay(Vector3 vector)
    //{
    //    foreach (TrainInterior interior in ModelTypeManager.Inst.CurrentTrain.TrainInteriors)
    //    {
    //        float distance = Vector3.Distance(vector, interior.CentralAxis.transform.position);

    //        if(distance > m_InteriorDistance)
    //        {
    //            interior.gameObject.SetActive(false);
    //        } else
    //        {
    //            interior.gameObject.SetActive(true);
    //        }
    //    }
    //}


    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.x > m_CameraInitOffset.x + m_CanMoveDistance)
        {
            transform.position = new Vector3(transform.position.x - movePosition.x, transform.position.y, transform.position.z);
        }
        else if (transform.position.x < m_CameraInitOffset.x - m_CanMoveDistance)
        {
            transform.position = new Vector3(transform.position.x - movePosition.x, transform.position.y, transform.position.z);
        }

        if (transform.position.y > m_CameraInitOffset.y + m_CanMoveDistance)
        {
            transform.position = new Vector3(transform.position.x, transform.position.y - movePosition.y, transform.position.z);
        }
        else if (transform.position.y < m_CameraInitOffset.y - m_CanMoveDistance)
        {
            transform.position = new Vector3(transform.position.x, transform.position.y - movePosition.y, transform.position.z);
        }

        if (transform.position.z > m_CameraInitOffset.z + m_CanMoveDistance)
        {
            transform.position = new Vector3(transform.position.x, transform.position.y, transform.position.z - movePosition.z);
        }
        else if (transform.position.z < m_CameraInitOffset.z - m_CanMoveDistance)
        {
            transform.position = new Vector3(transform.position.x, transform.position.y, transform.position.z - movePosition.z);
        }

       

    }
}