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

namespace Sunless.Architecture;

public static class ArchPlanWalls
{
	// A wall is filed on a room OR on a deck, so anything that reaches for "every wall in the plan" has to ask here -
	// walking the rooms alone is how a parapet stopped being reached by half the passes that reach a wall.
	public static IEnumerable<ArchWall> AllWalls( this ArchPlan plan, ArchKinds table = null ) => plan.Parts<ArchWall>( table );

	// The walls standing on this STOREY's own plane. A deck's walls are not among them - they stand a whole roof
	// higher, and anything working the deck asks the deck for them.
	public static IEnumerable<ArchWall> WallsOn( this ArchPlan plan, int level, ArchKinds table = null )
	{
		var kinds = table ?? ArchKinds.Load();

		return plan.AllRooms().Where( room => room.Floor == level ).SelectMany( room => plan.Filed<ArchWall>( room, kinds ) );
	}
}