using UnityEngine;

[DisallowMultipleComponent]
[RequireComponent(typeof(Canvas))]
public sealed class WorldSpaceCanvasCameraBinder : MonoBehaviour
{
    [SerializeField] private Canvas targetCanvas;

    public Canvas TargetCanvas => targetCanvas;

    private void Reset()
    {
        targetCanvas = GetComponent<Canvas>();
        RefreshBinding();
    }

    private void Awake() => ResolveCanvas();

    private void OnEnable()
    {
        LocalPlayerCameraRegistry.Changed += HandleLocalCameraChanged;
        RefreshBinding();
    }

    private void OnDisable() =>
        LocalPlayerCameraRegistry.Changed -= HandleLocalCameraChanged;

    public void RefreshBinding()
    {
        ResolveCanvas();

        if (targetCanvas == null || targetCanvas.renderMode != RenderMode.WorldSpace)
            return;

        targetCanvas.worldCamera = LocalPlayerCameraRegistry.Current;
    }

    private void ResolveCanvas()
    {
        if (targetCanvas == null)
            targetCanvas = GetComponent<Canvas>();
    }

    private void HandleLocalCameraChanged(Camera localCamera)
    {
        if (targetCanvas != null && targetCanvas.renderMode == RenderMode.WorldSpace)
            targetCanvas.worldCamera = localCamera;
    }

    [ContextMenu("Refresh Local Player Camera")]
    private void RefreshFromContextMenu() => RefreshBinding();
}