package net.minecraft.advancements.triggers;

import com.mojang.serialization.Codec;
import com.mojang.serialization.DataResult;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import java.util.Optional;
import net.minecraft.advancements.predicates.ContextAwarePredicate;
import net.minecraft.advancements.predicates.StatePropertiesPredicate;
import net.minecraft.advancements.predicates.entity.EntityPredicate;
import net.minecraft.core.Holder;
import net.minecraft.core.registries.BuiltInRegistries;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.state.BlockState;

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

	public void trigger(final ServerPlayer player, final BlockState state) {
		this.trigger(player, t -> t.matches(state));
	}

	public record TriggerInstance(Optional<ContextAwarePredicate> player, Optional<Holder<Block>> block, Optional<StatePropertiesPredicate> state)
		implements SimpleCriterionTrigger.SimpleInstance {
		public static final Codec<EnterBlockTrigger.TriggerInstance> CODEC = RecordCodecBuilder.<EnterBlockTrigger.TriggerInstance>create(
				i -> i.group(
						EntityPredicate.ADVANCEMENT_CODEC.optionalFieldOf("player").forGetter(EnterBlockTrigger.TriggerInstance::player),
						BuiltInRegistries.BLOCK.holderByNameCodec().optionalFieldOf("block").forGetter(EnterBlockTrigger.TriggerInstance::block),
						StatePropertiesPredicate.CODEC.optionalFieldOf("state").forGetter(EnterBlockTrigger.TriggerInstance::state)
					)
					.apply(i, EnterBlockTrigger.TriggerInstance::new)
			)
			.validate(EnterBlockTrigger.TriggerInstance::validate);

		private static DataResult<EnterBlockTrigger.TriggerInstance> validate(final EnterBlockTrigger.TriggerInstance trigger) {
			return (DataResult<EnterBlockTrigger.TriggerInstance>)trigger.block
				.flatMap(
					block -> trigger.state
						.flatMap(state -> state.checkState(((Block)block.value()).getStateDefinition()))
						.map(property -> DataResult.error(() -> "Block" + block + " has no property " + property))
				)
				.orElseGet(() -> DataResult.success(trigger));
		}

		public static Criterion<EnterBlockTrigger.TriggerInstance> entersBlock(final Block block) {
			return CriteriaTriggers.ENTER_BLOCK
				.createCriterion(new EnterBlockTrigger.TriggerInstance(Optional.empty(), Optional.of(block.builtInRegistryHolder()), Optional.empty()));
		}

		public boolean matches(final BlockState state) {
			return this.block.isPresent() && !state.is((Holder<Block>)this.block.get())
				? false
				: !this.state.isPresent() || ((StatePropertiesPredicate)this.state.get()).matches(state);
		}
	}
}