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.Typed;
import com.mojang.datafixers.schemas.Schema;
import com.mojang.datafixers.types.Type;
import com.mojang.datafixers.util.Pair;
import java.util.Optional;
import java.util.function.Predicate;
import java.util.function.UnaryOperator;
import net.minecraft.util.datafix.schemas.NamespacedSchema;

public abstract class ItemStackTagFix extends DataFix {
	private final String name;
	private final Predicate<String> idFilter;

	public ItemStackTagFix(final Schema outputSchema, final String name, final Predicate<String> idFilter) {
		super(outputSchema, false);
		this.name = name;
		this.idFilter = idFilter;
	}

	@Override
	public final TypeRewriteRule makeRule() {
		Type<?> itemStackType = this.getInputSchema().getType(References.ITEM_STACK);
		return this.fixTypeEverywhereTyped(this.name, itemStackType, createFixer(itemStackType, this.idFilter, this::fixItemStackTag));
	}

	public static UnaryOperator<Typed<?>> createFixer(final Type<?> itemStackType, final Predicate<String> idFilter, final UnaryOperator<Typed<?>> fixer) {
		OpticFinder<Pair<String, String>> idF = DSL.fieldFinder("id", DSL.named(References.ITEM_NAME.typeName(), NamespacedSchema.namespacedString()));
		OpticFinder<?> tagF = itemStackType.findField("tag");
		return input -> {
			Optional<Pair<String, String>> idOpt = input.getOptional(idF);
			return idOpt.isPresent() && idFilter.test((String)((Pair)idOpt.get()).getSecond()) ? input.updateTyped(tagF, fixer) : input;
		};
	}

	protected abstract Typed<?> fixItemStackTag(final Typed<?> tag);
}