using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using Cinemachine;
using Unity.VisualScripting;
using UnityEngine.UI;
using DG.Tweening;
using UnityEngine.UIElements;

namespace CodeMonkey.CameraSystem {

    public class CameraControlSystem : MonoBehaviour {

        [SerializeField] private CinemachineVirtualCamera cinemachineVirtualCamera;
        [SerializeField] private bool useDragPan = true;
        [SerializeField] private bool LowerY
            
            = true;
        [SerializeField] private bool MoveForward = false;
        [SerializeField] private float dragPanSpeed = 1f;
        [SerializeField] private float RotateSpeed = 50f;
        [SerializeField] private float zoomSpeed = 10f;
        [SerializeField] private float rotateMin = -30f;
        [SerializeField] private float rotateMax = 60f;
        [SerializeField] private float QESpeed = 60f;


        [SerializeField] private float followOffsetMin = 5f;
        [SerializeField] private float followOffsetMax = 50f;
        [SerializeField] private float followOffsetMinY = 10f;
        [SerializeField] private float followOffsetMaxY = 50f;

        private bool originalAOn = false;
        private bool originalBOn = false;

        private bool dragPanMoveActive;
        private Vector2 lastMousePosition;
        private bool RotateActive;
        private Vector3 followOffset;
        public bool OnUI = false;
        private float currentRotation = 0f;//µ±Ç°Ðýת½Ç¶È


        private void Awake() 
        {
            followOffset = cinemachineVirtualCamera.GetCinemachineComponent<CinemachineTransposer>().m_FollowOffset;

        }

        private void Update() {
            if (useDragPan) {
                HandleCameraMovementDragPan();
                originalAOn = true;
            }

            HandleCameraRotation();
            HandleCameraMouseRotation();

            if (LowerY)
            {
                HandleCameraZoom_LowerY();

                originalBOn = true;
            }
            if (MoveForward)
            {
                HandleCameraZoom_MoveForward();
            }

            if (EventSystem.current.IsPointerOverGameObject())
            {
                OnUI = true;
            }
            else
            {
                OnUI = false;
            }
            if (OnUI == true)
            {
                useDragPan = false;
                LowerY = false;
            }
            else
            {
                if (originalAOn)
                {
                    useDragPan = true;
                }
                else
                {
                    useDragPan = false;
                }
                if (originalBOn)
                {
                    LowerY = true;
                }
                else
                {
                    LowerY = false;
                }
            }
            //Debug.Log(followOffset);
            
        }
        private void HandleCameraMovementDragPan() {
            Vector3 inputDir = new Vector3(0, 0, 0);

            if (Input.GetMouseButtonDown(0)) {
                dragPanMoveActive = true;
                lastMousePosition = Input.mousePosition;
            }
            if (Input.GetMouseButtonUp(0)) {
                dragPanMoveActive = false;
            }

            if (dragPanMoveActive) {
                Vector2 mouseMovementDelta = (Vector2)Input.mousePosition - lastMousePosition;

                // float dragPanSpeed = 1f;
                inputDir.x = mouseMovementDelta.x * dragPanSpeed;
                inputDir.z = mouseMovementDelta.y * dragPanSpeed;

                lastMousePosition = Input.mousePosition;
            }

            Vector3 moveDir = transform.forward * inputDir.z + transform.right * inputDir.x;
            float moveSpeed = 1f;
            transform.position += moveDir * moveSpeed * Time.deltaTime;
            transform.position = new Vector3(Mathf.Clamp(transform.position.x, -.3f, .7f), 0, Mathf.Clamp(transform.position.z, -1.66f, 1.44f));
        }

        private void HandleCameraRotation() {
            float rotateDir = 0f;
            if (Input.GetKey(KeyCode.Q)) rotateDir = +1f;
            if (Input.GetKey(KeyCode.E)) rotateDir = -1f;

            transform.eulerAngles += new Vector3(0, rotateDir * RotateSpeed * Time.deltaTime, 0);
            transform.eulerAngles = new Vector3(0, ClampAngle(transform.eulerAngles.y, rotateMin, rotateMax), 0);
            //Debug.Log(transform.eulerAngles);

        }

        private  void HandleCameraMouseRotation()
        {
            float rotateDir = 0f;
            if (Input.GetMouseButtonDown(1))
            {
                RotateActive  = true;
                lastMousePosition = Input.mousePosition;
            }
            if (Input.GetMouseButtonUp(1))
            {
                RotateActive  = false;
            }

            if (RotateActive)
            {
                float mouseMovementDelta=Input.mousePosition .x-lastMousePosition.x;
                float RotateSpeed = 2f;
                rotateDir = mouseMovementDelta * RotateSpeed;
            }

            float rotateSpeed = .1f;
            transform.eulerAngles += new Vector3(0, rotateDir * rotateSpeed * Time.deltaTime, 0);
        }
        private void HandleCameraZoom_MoveForward()
        {
            Vector3 zoomDir = followOffset.normalized;

            float zoomAmount = 3f;
            if (Input.mouseScrollDelta.y > 0)
            {
                followOffset -= zoomDir * zoomAmount;
            }
            if (Input.mouseScrollDelta.y < 0)
            {
                followOffset += zoomDir * zoomAmount;
            }

            if (followOffset.magnitude < followOffsetMin)
            {
                followOffset = zoomDir * followOffsetMin;
            }

            if (followOffset.magnitude > followOffsetMax)
            {
                followOffset = zoomDir * followOffsetMax;
            }

            cinemachineVirtualCamera.GetCinemachineComponent<CinemachineTransposer>().m_FollowOffset =
                Vector3.Lerp(cinemachineVirtualCamera.GetCinemachineComponent<CinemachineTransposer>().m_FollowOffset, followOffset, Time.deltaTime * zoomSpeed);
        }

        private void HandleCameraZoom_LowerY()
        {
            float zoomAmount = .3f;
            if (Input.mouseScrollDelta.y > 0)
            {
                followOffset.y -= zoomAmount;
            }
            if (Input.mouseScrollDelta.y < 0)
            {
                followOffset.y += zoomAmount;
            }

            followOffset.y = Mathf.Clamp(followOffset.y, followOffsetMinY, followOffsetMaxY);

            cinemachineVirtualCamera.GetCinemachineComponent<CinemachineTransposer>().m_FollowOffset =
                Vector3.Lerp(cinemachineVirtualCamera.GetCinemachineComponent<CinemachineTransposer>().m_FollowOffset, followOffset, Time.deltaTime * zoomSpeed);

        }
        public void zhuanQ()
        {
            if (currentRotation < rotateMax)
        {
            transform.DORotate(new Vector3(0, QESpeed, 0), 1f, RotateMode.LocalAxisAdd);
            //transform.rotation = Quaternion.Euler(0, QESpeed, 0);
            currentRotation += QESpeed;
        }
        
        }
        public void zhuanE()
        {
            if (currentRotation > rotateMin)
            {
                transform.DORotate(new Vector3(0, -QESpeed, 0), 1f, RotateMode.LocalAxisAdd);
                currentRotation -= QESpeed;
            }
        }
        static float ClampAngle(float angle, float min, float max)
        {
            if (angle < -360)
                angle += 0;
            if (angle > 180)
                angle -= 360;
            return Mathf.Clamp(angle, min, max);
        }
        public void resetView()
        {
            followOffset = new Vector3(0, 2, 2);
            Vector3 move = new Vector3(0.25f, 0, 0.2f);
            cinemachineVirtualCamera.GetCinemachineComponent<CinemachineTransposer>().m_FollowOffset = followOffset;
            transform.DOMove(move, 1f);
            transform.DORotate(new Vector3(0,0,0) , .5f);
            currentRotation = 0;
        }
    }
}