package net.minecraft.world.level.levelgen.placement;

import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.stream.Stream;
import net.minecraft.core.BlockPos;
import net.minecraft.util.RandomSource;
import net.minecraft.world.level.levelgen.VerticalAnchor;
import net.minecraft.world.level.levelgen.heightproviders.HeightProvider;
import net.minecraft.world.level.levelgen.heightproviders.TrapezoidHeight;
import net.minecraft.world.level.levelgen.heightproviders.UniformHeight;

public class HeightRangePlacement extends PlacementModifier {
	public static final MapCodec<HeightRangePlacement> CODEC = RecordCodecBuilder.mapCodec(
		instance -> instance.group(HeightProvider.CODEC.fieldOf("height").forGetter(heightRangePlacement -> heightRangePlacement.height))
			.apply(instance, HeightRangePlacement::new)
	);
	private final HeightProvider height;

	private HeightRangePlacement(HeightProvider height) {
		this.height = height;
	}

	public static HeightRangePlacement of(HeightProvider height) {
		return new HeightRangePlacement(height);
	}

	public static HeightRangePlacement uniform(VerticalAnchor minInclusive, VerticalAnchor maxInclusive) {
		return of(UniformHeight.of(minInclusive, maxInclusive));
	}

	public static HeightRangePlacement triangle(VerticalAnchor minInclusive, VerticalAnchor maxInclusive) {
		return of(TrapezoidHeight.of(minInclusive, maxInclusive));
	}

	@Override
	public Stream<BlockPos> getPositions(PlacementContext context, RandomSource random, BlockPos pos) {
		return Stream.of(pos.atY(this.height.sample(random, context)));
	}

	@Override
	public PlacementModifierType<?> type() {
		return PlacementModifierType.HEIGHT_RANGE;
	}
}