package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DSL;
import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.DataFixUtils;
import com.mojang.datafixers.OpticFinder;
import com.mojang.datafixers.TypeRewriteRule;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.serialization.Dynamic;

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

	@Override
	public TypeRewriteRule makeRule() {
		TypeRewriteRule playerRule = this.fixTypeEverywhereTyped(
			"PlayerLegacyDimensionFix", this.getInputSchema().getType(References.PLAYER), input -> input.update(DSL.remainderFinder(), this::fixPlayer)
		);
		Type<?> dataType = this.getInputSchema().getType(References.SAVED_DATA_MAP_DATA);
		OpticFinder<?> mapDataF = dataType.findField("data");
		TypeRewriteRule mapRule = this.fixTypeEverywhereTyped(
			"MapLegacyDimensionFix", dataType, input -> input.updateTyped(mapDataF, data -> data.update(DSL.remainderFinder(), this::fixMap))
		);
		return TypeRewriteRule.seq(playerRule, mapRule);
	}

	private <T> Dynamic<T> fixMap(final Dynamic<T> remainder) {
		return remainder.update("dimension", this::fixDimensionId);
	}

	private <T> Dynamic<T> fixPlayer(final Dynamic<T> remainder) {
		return remainder.update("Dimension", this::fixDimensionId);
	}

	private <T> Dynamic<T> fixDimensionId(final Dynamic<T> id) {
		return DataFixUtils.orElse(id.asNumber().result().map(legacyId -> {
			return switch (legacyId.intValue()) {
				case -1 -> id.createString("minecraft:the_nether");
				case 1 -> id.createString("minecraft:the_end");
				default -> id.createString("minecraft:overworld");
			};
		}), id);
	}
}