package net.minecraft.world.level.storage.loot.functions;

import com.mojang.serialization.Codec;
import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.List;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.level.storage.loot.LootContext;
import net.minecraft.world.level.storage.loot.Validatable;
import net.minecraft.world.level.storage.loot.ValidationContext;
import net.minecraft.world.level.storage.loot.predicates.LootItemCondition;
import net.minecraft.world.level.storage.loot.providers.number.NumberProvider;
import net.minecraft.world.level.storage.loot.providers.number.NumberProviders;

public class SetItemCountFunction extends LootItemConditionalFunction {
	public static final MapCodec<SetItemCountFunction> MAP_CODEC = RecordCodecBuilder.mapCodec(
		i -> commonFields(i)
			.<NumberProvider, boolean>and(
				i.group(NumberProviders.CODEC.fieldOf("count").forGetter(f -> f.count), Codec.BOOL.optionalFieldOf("add", false).forGetter(f -> f.add))
			)
			.apply(i, SetItemCountFunction::new)
	);
	private final NumberProvider count;
	private final boolean add;

	private SetItemCountFunction(final List<LootItemCondition> predicates, final NumberProvider count, final boolean add) {
		super(predicates);
		this.count = count;
		this.add = add;
	}

	@Override
	public MapCodec<SetItemCountFunction> codec() {
		return MAP_CODEC;
	}

	@Override
	public void validate(final ValidationContext context) {
		super.validate(context);
		Validatable.validate(context, "count", this.count);
	}

	@Override
	public ItemStack run(final ItemStack itemStack, final LootContext context) {
		int base = this.add ? itemStack.getCount() : 0;
		itemStack.setCount(base + this.count.getInt(context));
		return itemStack;
	}

	public static LootItemConditionalFunction.Builder<?> setCount(final NumberProvider count) {
		return simpleBuilder(conditions -> new SetItemCountFunction(conditions, count, false));
	}

	public static LootItemConditionalFunction.Builder<?> setCount(final NumberProvider count, final boolean add) {
		return simpleBuilder(conditions -> new SetItemCountFunction(conditions, count, add));
	}
}