src/game/java/net/minecraft/util/datafix/fixes/BoatSplitFix.java

package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DSL;
import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.OpticFinder;
import com.mojang.datafixers.TypeRewriteRule;
import com.mojang.datafixers.Typed;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.serialization.Dynamic;
import java.util.Optional;
import net.minecraft.util.datafix.ExtraDataFixUtils;
import net.minecraft.util.datafix.schemas.NamespacedSchema;

public class BoatSplitFix extends DataFix {
    public BoatSplitFix(Schema p_366558_) {
        super(p_366558_, true);
    }

    private static boolean isNormalBoat(String p_363922_) {
        return p_363922_.equals("minecraft:boat");
    }

    private static boolean isChestBoat(String p_369570_) {
        return p_369570_.equals("minecraft:chest_boat");
    }

    private static boolean isAnyBoat(String p_366835_) {
        return isNormalBoat(p_366835_) || isChestBoat(p_366835_);
    }

    private static String mapVariantToNormalBoat(String p_362351_) {
        return switch (p_362351_) {
            case "spruce" -> "minecraft:spruce_boat";
            case "birch" -> "minecraft:birch_boat";
            case "jungle" -> "minecraft:jungle_boat";
            case "acacia" -> "minecraft:acacia_boat";
            case "cherry" -> "minecraft:cherry_boat";
            case "dark_oak" -> "minecraft:dark_oak_boat";
            case "mangrove" -> "minecraft:mangrove_boat";
            case "bamboo" -> "minecraft:bamboo_raft";
            default -> "minecraft:oak_boat";
        };
    }

    private static String mapVariantToChestBoat(String p_368305_) {
        return switch (p_368305_) {
            case "spruce" -> "minecraft:spruce_chest_boat";
            case "birch" -> "minecraft:birch_chest_boat";
            case "jungle" -> "minecraft:jungle_chest_boat";
            case "acacia" -> "minecraft:acacia_chest_boat";
            case "cherry" -> "minecraft:cherry_chest_boat";
            case "dark_oak" -> "minecraft:dark_oak_chest_boat";
            case "mangrove" -> "minecraft:mangrove_chest_boat";
            case "bamboo" -> "minecraft:bamboo_chest_raft";
            default -> "minecraft:oak_chest_boat";
        };
    }

    @Override
    public TypeRewriteRule makeRule() {
        OpticFinder<String> opticfinder = DSL.fieldFinder("id", NamespacedSchema.namespacedString());
        Type<?> type = this.getInputSchema().getType(References.ENTITY);
        Type<?> type1 = this.getOutputSchema().getType(References.ENTITY);
        return this.fixTypeEverywhereTyped("BoatSplitFix", type, type1, p_367696_ -> {
            Optional<String> optional = p_367696_.getOptional(opticfinder);
            if (optional.isPresent() && isAnyBoat(optional.get())) {
                Dynamic<?> dynamic = p_367696_.getOrCreate(DSL.remainderFinder());
                Optional<String> optional1 = dynamic.get("Type").asString().result();
                String s;
                if (isChestBoat(optional.get())) {
                    s = optional1.map(BoatSplitFix::mapVariantToChestBoat).orElse("minecraft:oak_chest_boat");
                } else {
                    s = optional1.map(BoatSplitFix::mapVariantToNormalBoat).orElse("minecraft:oak_boat");
                }

                return ExtraDataFixUtils.cast(type1, p_367696_).update(DSL.remainderFinder(), p_362212_ -> p_362212_.remove("Type")).set(opticfinder, s);
            } else {
                return ExtraDataFixUtils.cast(type1, p_367696_);
            }
        });
    }
}