using System;
using System.Collections.Generic;

namespace Sunless.Architecture;

public sealed class ArchAssetInstanceManifest : ArchKindManifest<ArchAssetInstance>
{
	public override ArchKind Kind => ArchKind.AssetInstance;

	public override string Slot => "Instances";

	public override ArchLayerDomain Domain => ArchLayerDomain.Connections;

	public override string Label => "Instance";

	public override string Glyph => "link";

	// A placed copy stands at the plan root, so nothing hosts it and only a hostless ask reaches its list.
	public override IEnumerable<object> Filed( ArchPlan plan, object host )
	{
		return plan is not null && host is null ? plan.Instances : Array.Empty<object>();
	}

	public override bool Unfile( ArchPlan plan, object payload )
	{
		return plan is not null && payload is ArchAssetInstance instance && plan.Instances.Remove( instance );
	}
}