using System;
using UnityEngine;
using Cinemachine;
using System.Collections;

public class CameraManager : MonoBehaviour
{
	public InputReader inputReader;
	public Camera mainCamera;
	public CinemachineFreeLook freeLookVCam;
	private bool _isRMBPressed;

	[SerializeField, Range(1f, 5f)]
	private float speed = default;
	[SerializeField] private TransformAnchor _cameraTransformAnchor = default;

	[Header("Listening on channels")]
	[Tooltip("The CameraManager listens to this event, fired by objects in any scene, to adapt camera position")]
	[SerializeField] private TransformEventChannelSO _frameObjectChannel = default;


	private bool cameraMovementLock = false;

	public void SetupProtagonistVirtualCamera(Transform target)
	{
		freeLookVCam.Follow = target;
		freeLookVCam.LookAt = target;
	}

	private void OnEnable()
	{
		inputReader.cameraMoveEvent += OnCameraMove;
		inputReader.enableMouseControlCameraEvent += OnEnableMouseControlCamera;
		inputReader.disableMouseControlCameraEvent += OnDisableMouseControlCamera;

		if (_frameObjectChannel != null)
			_frameObjectChannel.OnEventRaised += OnFrameObjectEvent;

		_cameraTransformAnchor.Transform = mainCamera.transform;
	}

	private void OnDisable()
	{
		inputReader.cameraMoveEvent -= OnCameraMove;
		inputReader.enableMouseControlCameraEvent -= OnEnableMouseControlCamera;
		inputReader.disableMouseControlCameraEvent -= OnDisableMouseControlCamera;

		if (_frameObjectChannel != null)
			_frameObjectChannel.OnEventRaised -= OnFrameObjectEvent;
	}

	private void OnEnableMouseControlCamera()
	{
		_isRMBPressed = true;

		Cursor.lockState = CursorLockMode.Locked;
		Cursor.visible = false;

		StartCoroutine(DisableMouseControlForFrame());
	}

	IEnumerator DisableMouseControlForFrame()
	{
		cameraMovementLock = true;
		yield return new WaitForEndOfFrame();
		cameraMovementLock = false;
	}

	private void OnDisableMouseControlCamera()
	{
		_isRMBPressed = false;

		Cursor.lockState = CursorLockMode.None;
		Cursor.visible = true;

		// when mouse control is disabled, the input needs to be cleared
		// or the last frame's input will 'stick' until the action is invoked again
		freeLookVCam.m_XAxis.m_InputAxisValue = 0;
		freeLookVCam.m_YAxis.m_InputAxisValue = 0;
	}

	private void OnCameraMove(Vector2 cameraMovement, bool isDeviceMouse)
	{
		if (cameraMovementLock)
			return;

		if (isDeviceMouse && !_isRMBPressed)
			return;

		freeLookVCam.m_XAxis.m_InputAxisValue = cameraMovement.x * Time.smoothDeltaTime * speed;
		freeLookVCam.m_YAxis.m_InputAxisValue = cameraMovement.y * Time.smoothDeltaTime * speed;
	}

	private void OnFrameObjectEvent(Transform value)
	{
		SetupProtagonistVirtualCamera(value);
	}
}