package net.minecraft.advancements.triggers;

import com.mojang.serialization.Codec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.Optional;
import net.minecraft.advancements.predicates.ContextAwarePredicate;
import net.minecraft.advancements.predicates.ItemPredicate;
import net.minecraft.advancements.predicates.entity.EntityPredicate;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.world.entity.npc.villager.AbstractVillager;
import net.minecraft.world.item.ItemInstance;
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.ValidationContextSource;

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

	public void trigger(final ServerPlayer player, final AbstractVillager villager, final ItemStack itemStack) {
		LootContext villagerContext = EntityPredicate.createContext(player, villager);
		this.trigger(player, t -> t.matches(villagerContext, itemStack));
	}

	public record TriggerInstance(Optional<ContextAwarePredicate> player, Optional<ContextAwarePredicate> villager, Optional<ItemPredicate> item)
		implements SimpleCriterionTrigger.SimpleInstance {
		public static final Codec<TradeTrigger.TriggerInstance> CODEC = RecordCodecBuilder.create(
			i -> i.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(i, 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(final EntityPredicate.Builder player) {
			return CriteriaTriggers.TRADE
				.createCriterion(new TradeTrigger.TriggerInstance(Optional.of(EntityPredicate.wrap(player)), Optional.empty(), Optional.empty()));
		}

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

		@Override
		public void validate(final ValidationContextSource validator) {
			SimpleCriterionTrigger.SimpleInstance.super.validate(validator);
			Validatable.validate(validator.entityContext(), "villager", this.villager);
		}
	}
}