using UnityEngine;

public class CharacterRotation : MonoBehaviour
{
    [Header("Visual")]
    [SerializeField]
    private Transform visual;

    [Header("Rotation")]
    [SerializeField]
    private float rotationSpeed = 540f;

    [Tooltip("In welche lokale Richtung zeigt die Grafik standardm??ig?")]
    [SerializeField]
    private SpriteForwardDirection spriteForward =
        SpriteForwardDirection.Up;

    private IMovementDirection movement;

    private enum SpriteForwardDirection
    {
        Up,
        Right
    }

    private void Awake()
    {
        movement =
            GetComponent<IMovementDirection>();

        if (movement == null)
        {
            Debug.LogError(
                "CharacterRotation ben?tigt eine Komponente, " +
                "die IMovementDirection implementiert.",
                this
            );
        }

        if (visual == null)
        {
            Debug.LogError(
                "CharacterRotation: Kein Visual zugewiesen.",
                this
            );
        }
    }

    private void Update()
    {
        if (movement == null || visual == null)
            return;

        Vector2 direction =
            movement.MovementDirection;

        // Keine Bewegung -> aktuelle Rotation behalten.
        if (direction.sqrMagnitude < 0.001f)
            return;

        RotateTowards(direction);
    }

    private void RotateTowards(Vector2 direction)
    {
        float targetAngle =
            Mathf.Atan2(
                direction.y,
                direction.x
            ) * Mathf.Rad2Deg;

        if (spriteForward ==
            SpriteForwardDirection.Up)
        {
            targetAngle -= 90f;
        }

        Quaternion targetRotation =
            Quaternion.Euler(
                0f,
                0f,
                targetAngle
            );

        visual.rotation =
            Quaternion.RotateTowards(
                visual.rotation,
                targetRotation,
                rotationSpeed * Time.deltaTime
            );
    }
}