package net.minecraft.util.datafix.fixes;

import com.mojang.datafixers.DataFix;
import com.mojang.datafixers.TypeRewriteRule;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.serialization.Dynamic;
import net.minecraft.util.datafix.schemas.NamespacedSchema;

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

	@Override
	public TypeRewriteRule makeRule() {
		Type<?> tradeType = this.getInputSchema().getType(References.VILLAGER_TRADE);
		return this.writeFixAndRead("EmptyItemInVillagerTradeFix", tradeType, tradeType, input -> {
			Dynamic<?> buyB = input.get("buyB").orElseEmptyMap();
			String id = NamespacedSchema.ensureNamespaced(buyB.get("id").asString("minecraft:air"));
			int count = buyB.get("count").asInt(0);
			return !id.equals("minecraft:air") && count != 0 ? input : input.remove("buyB");
		});
	}
}