package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DSL;
import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.TypeRewriteRule;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.serialization.Dynamic;
import com.mojang.serialization.OptionalDynamic;
import net.minecraft.util.datafix.ExtraDataFixUtils;

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

	private static <T> Dynamic<T> fixDragonFight(final Dynamic<T> tag) {
		return tag.update("ExitPortalLocation", ExtraDataFixUtils::fixBlockPos);
	}

	@Override
	protected TypeRewriteRule makeRule() {
		return this.fixTypeEverywhereTyped(
			"LegacyDragonFightFix", this.getInputSchema().getType(References.LEVEL), input -> input.update(DSL.remainderFinder(), tag -> {
				OptionalDynamic<?> dragonFight = tag.get("DragonFight");
				if (dragonFight.result().isPresent()) {
					return tag;
				} else {
					Dynamic<?> legacyFight = tag.get("DimensionData").get("1").get("DragonFight").orElseEmptyMap();
					return tag.set("DragonFight", fixDragonFight(legacyFight));
				}
			})
		);
	}
}