package net.minecraft.advancements.critereon;

import com.mojang.serialization.Codec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.Optional;
import net.minecraft.advancements.CriteriaTriggers;
import net.minecraft.advancements.Criterion;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.world.entity.npc.AbstractVillager;
import net.minecraft.world.item.ItemStack;
import net.minecraft.world.level.storage.loot.LootContext;

public class TradeTrigger extends SimpleCriterionTrigger<TradeTrigger.TriggerInstance> {
	@Override
	public Codec<TradeTrigger.TriggerInstance> codec() {
		return TradeTrigger.TriggerInstance.CODEC;
	}

	public void trigger(ServerPlayer player, AbstractVillager villager, ItemStack stack) {
		LootContext lootContext = EntityPredicate.createContext(player, villager);
		this.trigger(player, triggerInstance -> triggerInstance.matches(lootContext, stack));
	}

	public record TriggerInstance(Optional<ContextAwarePredicate> player, Optional<ContextAwarePredicate> villager, Optional<ItemPredicate> item)
		implements SimpleCriterionTrigger.SimpleInstance {
		public static final Codec<TradeTrigger.TriggerInstance> CODEC = RecordCodecBuilder.create(
			instance -> instance.group(
					EntityPredicate.ADVANCEMENT_CODEC.optionalFieldOf("player").forGetter(TradeTrigger.TriggerInstance::player),
					EntityPredicate.ADVANCEMENT_CODEC.optionalFieldOf("villager").forGetter(TradeTrigger.TriggerInstance::villager),
					ItemPredicate.CODEC.optionalFieldOf("item").forGetter(TradeTrigger.TriggerInstance::item)
				)
				.apply(instance, TradeTrigger.TriggerInstance::new)
		);

		public static Criterion<TradeTrigger.TriggerInstance> tradedWithVillager() {
			return CriteriaTriggers.TRADE.createCriterion(new TradeTrigger.TriggerInstance(Optional.empty(), Optional.empty(), Optional.empty()));
		}

		public static Criterion<TradeTrigger.TriggerInstance> tradedWithVillager(EntityPredicate.Builder villager) {
			return CriteriaTriggers.TRADE
				.createCriterion(new TradeTrigger.TriggerInstance(Optional.of(EntityPredicate.wrap(villager)), Optional.empty(), Optional.empty()));
		}

		public boolean matches(LootContext context, ItemStack stack) {
			return this.villager.isPresent() && !((ContextAwarePredicate)this.villager.get()).matches(context)
				? false
				: !this.item.isPresent() || ((ItemPredicate)this.item.get()).test(stack);
		}

		@Override
		public void validate(CriterionValidator validator) {
			SimpleCriterionTrigger.SimpleInstance.super.validate(validator);
			validator.validateEntity(this.villager, ".villager");
		}
	}
}