using UnityEngine;

public class DialogueBillboard : MonoBehaviour
{
    [Header("Target")]
    [SerializeField] private Transform target;
    [SerializeField] private Camera targetCamera;

    [Header("Position")]
    [SerializeField] private Vector3 offset = new Vector3(0f, 2f, 0f);

    [Header("Look At Camera")]
    [SerializeField] private bool faceCamera = true;
    [SerializeField] private bool lockYAxis = false;
    [SerializeField] private bool rotate180AfterLookAt = true;

    public Transform Target => target;

    private void LateUpdate()
    {
        if (target == null)
            return;

        transform.position = target.position + offset;

        if (!faceCamera)
            return;

        if (targetCamera == null)
            targetCamera = Camera.main;

        if (targetCamera == null)
            return;

        Vector3 lookPosition = targetCamera.transform.position;

        if (lockYAxis)
            lookPosition.y = transform.position.y;

        transform.LookAt(lookPosition);

        if (rotate180AfterLookAt)
            transform.Rotate(0f, 180f, 0f);
    }

    public void SetTarget(Transform newTarget)
    {
        target = newTarget;
    }

    public void ClearTarget()
    {
        target = null;
    }

    public void SetCamera(Camera newCamera)
    {
        targetCamera = newCamera;
    }

    public void SetOffset(Vector3 newOffset)
    {
        offset = newOffset;
    }
}