using UnityEngine;

/// <summary>
/// Placement handler for repositioning an already-placed block.
/// </summary>
public class ExistingBlockPlacementHandler : IPlacementHandler
{
    private readonly CommandHandler _commandHandler;

    public ExistingBlockPlacementHandler(CommandHandler commandHandler)
    {
        _commandHandler = commandHandler;
        Debug.Log("initialize the ExistingBlockPlacement");
    }

    public void Commit(BlockEditContext ctx)
    {
        if (ctx.SourceObject == null) return;

        _commandHandler.moveBlock(
            ctx.SourceObject.GetComponent<Block>().getBlockId(),
            ctx.OriginalPosition,
            ctx.GhostTransform.position,
            ctx.OriginalRotation,
            ctx.GhostTransform.rotation);
        // ensure the correct positionning after commiting
        RestoreObject(ctx, ctx.GhostTransform.position, ctx.GhostTransform.rotation);
    }

    public void Cancel(BlockEditContext ctx)
    {
        if (ctx.SourceObject == null) return;
        RestoreObject(ctx, ctx.OriginalPosition, ctx.OriginalRotation);
    }

    private void RestoreObject(BlockEditContext ctx, Vector3 pos, Quaternion rot)
    {
        ctx.SourceObject.transform.SetPositionAndRotation(pos, rot);
        RestoreMaterialAlphaAndColor(ctx.SourceObject);
        SetLayerRecursively(ctx.SourceObject, LayerMask.NameToLayer("Interactable"));
        ctx.SourceObject.SetActive(true);
    }

    private void RestoreMaterialAlphaAndColor(GameObject obj)
    {
        foreach (var r in obj.GetComponentsInChildren<Renderer>())
        {
            if (r.gameObject.layer == LayerMask.NameToLayer("Gizmos")) continue;

            foreach (var mat in r.materials)
            {
                if (mat.HasProperty("_Color"))
                {
                    mat.color = new Color(1f, 1f, 1f, 1f);
                }
            }
        }
    }

    private void SetLayerRecursively(GameObject obj, int layer, System.Func<Transform, bool> Method)
    {
        if (Method(obj.transform))
            obj.layer = layer;
        foreach (Transform child in obj.transform)
            SetLayerRecursively(child.gameObject, layer, Method);
    }

    private void SetLayerRecursively(GameObject obj, int layer)
    {
        SetLayerRecursively(obj, layer, x =>
        {
            return x.gameObject.layer != LayerMask.NameToLayer("Gizmos");
        });
    }

    public void Debugln()
    {
        Debug.Log("Hi I'm Existing");
    }
}