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.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.datafixers.util.Either;
import com.mojang.datafixers.util.Pair;
import com.mojang.datafixers.util.Unit;
import com.mojang.serialization.Dynamic;
import java.util.Optional;

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

	@Override
	public TypeRewriteRule makeRule() {
		OpticFinder<Pair<String, Pair<Either<Pair<String, String>, Unit>, Pair<Either<?, Unit>, Dynamic<?>>>>> itemStackF = DSL.typeFinder(
			(Type<Pair<String, Pair<Either<Pair<String, String>, Unit>, Pair<Either<?, Unit>, Dynamic<?>>>>>)this.getInputSchema().getType(References.ITEM_STACK)
		);
		return this.fixTypeEverywhereTyped(
			"EmptyItemInHotbarFix",
			this.getInputSchema().getType(References.HOTBAR),
			input -> input.update(itemStackF, namedStack -> namedStack.mapSecond(itemStack -> {
				Optional<String> id = ((Either)itemStack.getFirst()).left().map(Pair::getSecond);
				Dynamic<?> remainder = (Dynamic<?>)((Pair)itemStack.getSecond()).getSecond();
				boolean isAir = id.isEmpty() || ((String)id.get()).equals("minecraft:air");
				boolean isEmpty = remainder.get("Count").asInt(0) <= 0;
				return !isAir && !isEmpty ? itemStack : Pair.of(Either.right(Unit.INSTANCE), Pair.of(Either.right(Unit.INSTANCE), remainder.emptyMap()));
			}))
		);
	}
}