using Cinemachine;
using UnityEngine;

public class CameraController : MonoBehaviour {
    private const float minFollowYOffset = 2f;
    private const float maxFollowYOffset = 12f;
    [SerializeField] private float MoveSpeed = 10f;
    [SerializeField] private float RotationSpeed = 100f;
    [SerializeField] private float ZoomAmount = 1f;
    [SerializeField] private float ZoomSpeed = 5f;
    [SerializeField] private CinemachineVirtualCamera CinemachineVirtualCamera;
    private CinemachineTransposer cinemachineTransposer;
    private Vector3 targetFollowOffset;

    private void Awake() => cinemachineTransposer = CinemachineVirtualCamera.GetCinemachineComponent<CinemachineTransposer>();

    private void Start() => targetFollowOffset = cinemachineTransposer.m_FollowOffset;

    private void Update() {
        HandleMovement();
        HandleRotation();
        HandleZoom();
    }

    private void HandleMovement() {
        Vector3 inputMoveDir = new();
        if (Input.GetKey(KeyCode.W)) inputMoveDir.z = +1f;
        if (Input.GetKey(KeyCode.S)) inputMoveDir.z = -1f;
        if (Input.GetKey(KeyCode.A)) inputMoveDir.x = -1f;
        if (Input.GetKey(KeyCode.D)) inputMoveDir.x = +1f;
        transform.position += Time.deltaTime * MoveSpeed * (transform.forward * inputMoveDir.z + transform.right * inputMoveDir.x);
    }

    private void HandleRotation() {
        Vector3 rotationVector = new();
        if (Input.GetKey(KeyCode.Q)) rotationVector.y = +1f;
        if (Input.GetKey(KeyCode.E)) rotationVector.y = -1f;
        transform.eulerAngles += Time.deltaTime * RotationSpeed * rotationVector;
    }

    private void HandleZoom() {
        switch (Input.mouseScrollDelta.y) {
            case > 0:
                targetFollowOffset.y -= ZoomAmount;
                break;
            case < 0:
                targetFollowOffset.y += ZoomAmount;
                break;
        }

        targetFollowOffset.y = Mathf.Clamp(targetFollowOffset.y, minFollowYOffset, maxFollowYOffset);
        cinemachineTransposer.m_FollowOffset = Vector3.Lerp(cinemachineTransposer.m_FollowOffset, targetFollowOffset, ZoomSpeed * Time.deltaTime);
    }
}