using System;
using System.Collections.Generic;
using System.Linq;
using Sandbox;

namespace Sunless.Architecture;

public sealed class ArchRoofManifest : ArchKindManifest<ArchRoofPart> {
	public override ArchKind Kind => ArchKind.Roof;

	public override string Slot => "Roofs";

	public override IEnumerable<Type> Hosts => new[] { typeof( ArchBuilding ) };

	public override string Label => "Roof";

	public override string Glyph => ArchIcons.Get( "subtool_roof", "roofing" );

	public override string Subtool => ArchSubtools.Roof;

	public override string HostOutput => "Roof deck or eave run";

	// A wall standing on the deck is a parapet, so the deck it stands on is what owns it.
	public override IEnumerable<ArchKind> Children => new[]
	{
		ArchKind.RoofLight, ArchKind.Downpipe, ArchKind.Wall
	};

	// Ranks BEHIND the building on purpose: a roofed shell reads as all roof from above, and a roof that won the
	// click would leave the building unpickable.
	public override int DirectRank => 120;

	public override ArchLayerStage Stage( object payload ) => ArchLayerStage.Structure;

	public override IReadOnlyList<List<Vector2>> Loops( object payload ) {
		if ( payload is not ArchRoofPart roof ) {
			return Array.Empty<List<Vector2>>();
		}

		var outline = roof.Outline();

		return outline.Count >= 3 ? new List<List<Vector2>> { outline } : Array.Empty<List<Vector2>>();
	}

	public override float Height( object payload, float fallback ) {
		return payload is ArchRoofPart roof ? roof.BaseHeight : fallback;
	}
}