package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.OpticFinder;
import com.mojang.datafixers.TypeRewriteRule;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import net.minecraft.nbt.NbtFormatException;

public class WorldGenSettingsDisallowOldCustomWorldsFix extends DataFix {
	public WorldGenSettingsDisallowOldCustomWorldsFix(final Schema outputSchema) {
		super(outputSchema, false);
	}

	@Override
	protected TypeRewriteRule makeRule() {
		Type<?> worldGenSettingsType = this.getInputSchema().getType(References.WORLD_GEN_SETTINGS);
		OpticFinder<?> dimensionsFinder = worldGenSettingsType.findField("dimensions");
		return this.fixTypeEverywhereTyped(
			"WorldGenSettingsDisallowOldCustomWorldsFix_" + this.getOutputSchema().getVersionKey(),
			worldGenSettingsType,
			input -> input.updateTyped(dimensionsFinder, dimensions -> {
				dimensions.write().map(tag -> tag.getMapValues().map(map -> {
					map.forEach((key, value) -> {
						if (value.get("type").asString().result().isEmpty()) {
							throw new NbtFormatException("Unable load old custom worlds.");
						}
					});
					return map;
				}));
				return dimensions;
			})
		);
	}
}