package net.minecraft.world.level.levelgen.structure.structures;

import com.mojang.serialization.MapCodec;
import java.util.List;
import java.util.Optional;
import net.minecraft.world.level.levelgen.structure.Structure;
import net.minecraft.world.level.levelgen.structure.StructurePiece;
import net.minecraft.world.level.levelgen.structure.StructureType;
import net.minecraft.world.level.levelgen.structure.pieces.StructurePiecesBuilder;

public class StrongholdStructure extends Structure {
	public static final MapCodec<StrongholdStructure> CODEC = simpleCodec(StrongholdStructure::new);

	public StrongholdStructure(final Structure.StructureSettings settings) {
		super(settings);
	}

	@Override
	public Optional<Structure.GenerationStub> findGenerationPoint(final Structure.GenerationContext context) {
		return Optional.of(new Structure.GenerationStub(context.chunkPos().getWorldPosition(), builder -> generatePieces(builder, context)));
	}

	private static void generatePieces(final StructurePiecesBuilder builder, final Structure.GenerationContext context) {
		int tries = 0;

		StrongholdPieces.StartPiece startRoom;
		do {
			builder.clear();
			context.random().setLargeFeatureSeed(context.seed() + tries++, context.chunkPos().x(), context.chunkPos().z());
			StrongholdPieces.resetPieces();
			startRoom = new StrongholdPieces.StartPiece(context.random(), context.chunkPos().getBlockX(2), context.chunkPos().getBlockZ(2));
			builder.addPiece(startRoom);
			startRoom.addChildren(startRoom, builder, context.random());
			List<StructurePiece> pendingChildren = startRoom.pendingChildren;

			while (!pendingChildren.isEmpty()) {
				int pos = context.random().nextInt(pendingChildren.size());
				StructurePiece structurePiece = (StructurePiece)pendingChildren.remove(pos);
				structurePiece.addChildren(startRoom, builder, context.random());
			}

			builder.moveBelowSeaLevel(context.chunkGenerator().getSeaLevel(), context.chunkGenerator().getMinY(), context.random(), 10);
		} while (builder.isEmpty() || startRoom.portalRoomPiece == null);
	}

	@Override
	public StructureType<?> type() {
		return StructureType.STRONGHOLD;
	}
}