using System.Collections.Generic;
using Unity.Cinemachine;
using UnityEngine;
using UnityEngine.Rendering;

public class AimCameraRig : CameraRigBase
{
    public InputAxis AimMode = InputAxis.DefaultMomentary; //누르는 동안만 유지

    [SerializeField] private CinemachineCamera _aimCamera;
    [SerializeField] private CinemachineCamera _freeCamera;

    //CameraRigBase에 전달용
    private List<CinemachineVirtualCameraBase> _myCameras = new List<CinemachineVirtualCameraBase>();
    protected override IReadOnlyList<CinemachineVirtualCameraBase> CameraCandidates => _myCameras;

    public CinemachineCamera ActiveCmCamera => LiveChild as CinemachineCamera;

    private bool _isAiming => AimMode.Value > 0.5f;
    private float _lastKnownFOV = 60f;

    protected override void Awake()
    {
        base.Awake();
        
        _myCameras.Clear();
        if (_aimCamera != null) _myCameras.Add(_aimCamera);
        if (_freeCamera != null) _myCameras.Add(_freeCamera);
    }

    protected override void Start()
    {
        base.Start();

        if (_aimCamera == null || _freeCamera == null)
        {
            Debug.LogError($"{gameObject.name}: 프리팹 인스펙터에서 카메라 할당이 되지 않았습니다.");
            return;
        }

        CinemachineCamera topPriorityCam = GetHighestPriorityCamera() as CinemachineCamera;
        CinemachineCamera currentTargetCam = (LiveChild as CinemachineCamera) ?? topPriorityCam;

        if (currentTargetCam != null && currentTargetCam.Follow != null)
        {
            _controller = currentTargetCam.Follow.GetComponentInChildren<PlayerCharacterController>();
        }

        if (_controller == null)
        {
            Debug.LogWarning($"현재 카메라의 Follow 대상을 찾을 수 없습니다.");
        }
    }

    public override void GetInputAxes(List<IInputAxisOwner.AxisDescriptor> axes)
    {
        base.GetInputAxes(axes);
        axes.Add(new() { DrivenAxis = () => ref AimMode, Name = "Aim" });
    }

    protected override CinemachineVirtualCameraBase ChooseCurrentCamera(Vector3 worldUp, float deltaTime)
    {
        var oldCam = (CinemachineVirtualCameraBase)LiveChild;
        var newCam = _isAiming ? _aimCamera : _freeCamera;
        if (_controller != null && oldCam != newCam)
        {
            _controller.RotationMode = _isAiming
                ? PlayerCharacterController.PlayerRotationMode.CameraCoupled
                : PlayerCharacterController.PlayerRotationMode.CameraDecoupled;
            _controller.RecenterPlayer();
        }
        return newCam;
    }

    public float CurrentFOV 
    {
        get 
        {
            if (ActiveCmCamera != null)
                _lastKnownFOV = ActiveCmCamera.Lens.FieldOfView;

            return _lastKnownFOV;
        }
        set 
        {
            if (ActiveCmCamera != null)
                ActiveCmCamera.Lens.FieldOfView = value;
        } 
    }
}