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

import com.google.common.collect.Lists;
import com.mojang.logging.LogUtils;
import com.mojang.serialization.Codec;
import com.mojang.serialization.DataResult;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import com.mojang.serialization.codecs.RecordCodecBuilder.Instance;
import java.util.List;
import java.util.Optional;
import java.util.function.Function;
import net.minecraft.core.Holder;
import net.minecraft.core.HolderGetter;
import net.minecraft.core.HolderSet;
import net.minecraft.core.RegistryCodecs;
import net.minecraft.core.registries.Registries;
import net.minecraft.data.worldgen.placement.MiscOverworldPlacements;
import net.minecraft.data.worldgen.placement.PlacementUtils;
import net.minecraft.resources.RegistryOps;
import net.minecraft.world.level.biome.Biome;
import net.minecraft.world.level.biome.BiomeGenerationSettings;
import net.minecraft.world.level.biome.Biomes;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.dimension.DimensionType;
import net.minecraft.world.level.levelgen.GenerationStep;
import net.minecraft.world.level.levelgen.Heightmap;
import net.minecraft.world.level.levelgen.feature.Feature;
import net.minecraft.world.level.levelgen.feature.configurations.LayerConfiguration;
import net.minecraft.world.level.levelgen.placement.PlacedFeature;
import net.minecraft.world.level.levelgen.structure.BuiltinStructureSets;
import net.minecraft.world.level.levelgen.structure.StructureSet;
import org.slf4j.Logger;

public class FlatLevelGeneratorSettings {
    private static final Logger LOGGER = LogUtils.getLogger();
    public static final Codec<FlatLevelGeneratorSettings> CODEC = RecordCodecBuilder.<FlatLevelGeneratorSettings>create(
            p_209800_ -> p_209800_.group(
                    RegistryCodecs.homogeneousList(Registries.STRUCTURE_SET).lenientOptionalFieldOf("structure_overrides").forGetter(p_209812_ -> p_209812_.structureOverrides),
                    FlatLayerInfo.CODEC.listOf().fieldOf("layers").forGetter(FlatLevelGeneratorSettings::getLayersInfo),
                    Codec.BOOL.fieldOf("lakes").orElse(false).forGetter(p_161912_ -> p_161912_.addLakes),
                    Codec.BOOL.fieldOf("features").orElse(false).forGetter(p_209809_ -> p_209809_.decoration),
                    Biome.CODEC.lenientOptionalFieldOf("biome").orElseGet(Optional::empty).forGetter(p_209807_ -> Optional.of(p_209807_.biome)),
                    RegistryOps.retrieveElement(Biomes.PLAINS),
                    RegistryOps.retrieveElement(MiscOverworldPlacements.LAKE_LAVA_UNDERGROUND),
                    RegistryOps.retrieveElement(MiscOverworldPlacements.LAKE_LAVA_SURFACE)
                )
                .apply(p_209800_, FlatLevelGeneratorSettings::new)
        )
        .comapFlatMap(FlatLevelGeneratorSettings::validateHeight, Function.identity())
        .stable();
    private final Optional<HolderSet<StructureSet>> structureOverrides;
    private final List<FlatLayerInfo> layersInfo = Lists.newArrayList();
    private final Holder<Biome> biome;
    private final List<BlockState> layers;
    private boolean voidGen;
    private boolean decoration;
    private boolean addLakes;
    private final List<Holder<PlacedFeature>> lakes;

    private static DataResult<FlatLevelGeneratorSettings> validateHeight(FlatLevelGeneratorSettings p_161906_) {
        int i = p_161906_.layersInfo.stream().mapToInt(FlatLayerInfo::getHeight).sum();
        return i > DimensionType.Y_SIZE
            ? DataResult.error(() -> "Sum of layer heights is > " + DimensionType.Y_SIZE, p_161906_)
            : DataResult.success(p_161906_);
    }

    private FlatLevelGeneratorSettings(
        Optional<HolderSet<StructureSet>> p_256456_,
        List<FlatLayerInfo> p_255826_,
        boolean p_255740_,
        boolean p_255726_,
        Optional<Holder<Biome>> p_256292_,
        Holder.Reference<Biome> p_255964_,
        Holder<PlacedFeature> p_256419_,
        Holder<PlacedFeature> p_255710_
    ) {
        this(p_256456_, getBiome(p_256292_, p_255964_), List.of(p_256419_, p_255710_));
        if (p_255740_) {
            this.setAddLakes();
        }

        if (p_255726_) {
            this.setDecoration();
        }

        this.layersInfo.addAll(p_255826_);
        this.updateLayers();
    }

    private static Holder<Biome> getBiome(Optional<? extends Holder<Biome>> p_256142_, Holder<Biome> p_256475_) {
        if (p_256142_.isEmpty()) {
            LOGGER.error("Unknown biome, defaulting to plains");
            return p_256475_;
        } else {
            return (Holder<Biome>)p_256142_.get();
        }
    }

    public FlatLevelGeneratorSettings(Optional<HolderSet<StructureSet>> p_256029_, Holder<Biome> p_256190_, List<Holder<PlacedFeature>> p_255960_) {
        this.structureOverrides = p_256029_;
        this.biome = p_256190_;
        this.layers = Lists.newArrayList();
        this.lakes = p_255960_;
    }

    public FlatLevelGeneratorSettings withBiomeAndLayers(List<FlatLayerInfo> p_256587_, Optional<HolderSet<StructureSet>> p_256500_, Holder<Biome> p_256598_) {
        FlatLevelGeneratorSettings flatlevelgeneratorsettings = new FlatLevelGeneratorSettings(p_256500_, p_256598_, this.lakes);

        for (FlatLayerInfo flatlayerinfo : p_256587_) {
            flatlevelgeneratorsettings.layersInfo.add(new FlatLayerInfo(flatlayerinfo.getHeight(), flatlayerinfo.getBlockState().getBlock()));
            flatlevelgeneratorsettings.updateLayers();
        }

        if (this.decoration) {
            flatlevelgeneratorsettings.setDecoration();
        }

        if (this.addLakes) {
            flatlevelgeneratorsettings.setAddLakes();
        }

        return flatlevelgeneratorsettings;
    }

    public void setDecoration() {
        this.decoration = true;
    }

    public void setAddLakes() {
        this.addLakes = true;
    }

    public BiomeGenerationSettings adjustGenerationSettings(Holder<Biome> p_226295_) {
        if (!p_226295_.equals(this.biome)) {
            return p_226295_.value().getGenerationSettings();
        } else {
            BiomeGenerationSettings biomegenerationsettings = this.getBiome().value().getGenerationSettings();
            BiomeGenerationSettings.PlainBuilder biomegenerationsettings$plainbuilder = new BiomeGenerationSettings.PlainBuilder();
            if (this.addLakes) {
                for (Holder<PlacedFeature> holder : this.lakes) {
                    biomegenerationsettings$plainbuilder.addFeature(GenerationStep.Decoration.LAKES, holder);
                }
            }

            boolean flag = (!this.voidGen || p_226295_.is(Biomes.THE_VOID)) && this.decoration;
            if (flag) {
                List<HolderSet<PlacedFeature>> list = biomegenerationsettings.features();

                for (int i = 0; i < list.size(); i++) {
                    if (i != GenerationStep.Decoration.UNDERGROUND_STRUCTURES.ordinal()
                        && i != GenerationStep.Decoration.SURFACE_STRUCTURES.ordinal()
                        && (!this.addLakes || i != GenerationStep.Decoration.LAKES.ordinal())) {
                        for (Holder<PlacedFeature> holder1 : list.get(i)) {
                            biomegenerationsettings$plainbuilder.addFeature(i, holder1);
                        }
                    }
                }
            }

            List<BlockState> list1 = this.getLayers();

            for (int j = 0; j < list1.size(); j++) {
                BlockState blockstate = list1.get(j);
                if (!Heightmap.Types.MOTION_BLOCKING.isOpaque().test(blockstate)) {
                    list1.set(j, null);
                    biomegenerationsettings$plainbuilder.addFeature(
                        GenerationStep.Decoration.TOP_LAYER_MODIFICATION, PlacementUtils.inlinePlaced(Feature.FILL_LAYER, new LayerConfiguration(j, blockstate))
                    );
                }
            }

            return biomegenerationsettings$plainbuilder.build();
        }
    }

    public Optional<HolderSet<StructureSet>> structureOverrides() {
        return this.structureOverrides;
    }

    public Holder<Biome> getBiome() {
        return this.biome;
    }

    public List<FlatLayerInfo> getLayersInfo() {
        return this.layersInfo;
    }

    public List<BlockState> getLayers() {
        return this.layers;
    }

    public void updateLayers() {
        this.layers.clear();

        for (FlatLayerInfo flatlayerinfo : this.layersInfo) {
            for (int i = 0; i < flatlayerinfo.getHeight(); i++) {
                this.layers.add(flatlayerinfo.getBlockState());
            }
        }

        this.voidGen = this.layers.stream().allMatch(p_209802_ -> p_209802_.is(Blocks.AIR));
    }

    public static FlatLevelGeneratorSettings getDefault(
        HolderGetter<Biome> p_256175_, HolderGetter<StructureSet> p_256081_, HolderGetter<PlacedFeature> p_256484_
    ) {
        HolderSet<StructureSet> holderset = HolderSet.direct(
            p_256081_.getOrThrow(BuiltinStructureSets.STRONGHOLDS), p_256081_.getOrThrow(BuiltinStructureSets.VILLAGES)
        );
        FlatLevelGeneratorSettings flatlevelgeneratorsettings = new FlatLevelGeneratorSettings(
            Optional.of(holderset), getDefaultBiome(p_256175_), createLakesList(p_256484_)
        );
        flatlevelgeneratorsettings.getLayersInfo().add(new FlatLayerInfo(1, Blocks.BEDROCK));
        flatlevelgeneratorsettings.getLayersInfo().add(new FlatLayerInfo(2, Blocks.DIRT));
        flatlevelgeneratorsettings.getLayersInfo().add(new FlatLayerInfo(1, Blocks.GRASS_BLOCK));
        flatlevelgeneratorsettings.updateLayers();
        return flatlevelgeneratorsettings;
    }

    public static Holder<Biome> getDefaultBiome(HolderGetter<Biome> p_256645_) {
        return p_256645_.getOrThrow(Biomes.PLAINS);
    }

    public static List<Holder<PlacedFeature>> createLakesList(HolderGetter<PlacedFeature> p_256282_) {
        return List.of(p_256282_.getOrThrow(MiscOverworldPlacements.LAKE_LAVA_UNDERGROUND), p_256282_.getOrThrow(MiscOverworldPlacements.LAKE_LAVA_SURFACE));
    }
}