package net.minecraft.world.entity.ai.sensing;

import com.google.common.collect.ImmutableSet;
import java.util.Comparator;
import java.util.List;
import java.util.Set;
import java.util.function.BiPredicate;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.entity.EntitySelector;
import net.minecraft.world.entity.PathfinderMob;
import net.minecraft.world.entity.ai.Brain;
import net.minecraft.world.entity.ai.attributes.Attributes;
import net.minecraft.world.entity.ai.memory.MemoryModuleType;
import net.minecraft.world.entity.ai.targeting.TargetingConditions;
import net.minecraft.world.entity.animal.Animal;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.ItemStack;

public class TemptingSensor extends Sensor<PathfinderMob> {
	private static final TargetingConditions TEMPT_TARGETING = TargetingConditions.forNonCombat().ignoreLineOfSight();
	private final BiPredicate<PathfinderMob, ItemStack> temptations;

	public TemptingSensor(final Predicate<ItemStack> tt) {
		this((BiPredicate<PathfinderMob, ItemStack>)((m, i) -> tt.test(i)));
	}

	public static TemptingSensor forAnimal() {
		return new TemptingSensor((BiPredicate<PathfinderMob, ItemStack>)((m, i) -> m instanceof Animal animal ? animal.isFood(i) : false));
	}

	private TemptingSensor(final BiPredicate<PathfinderMob, ItemStack> temptations) {
		this.temptations = temptations;
	}

	protected void doTick(final ServerLevel level, final PathfinderMob body) {
		Brain<?> brain = body.getBrain();
		TargetingConditions targeting = TEMPT_TARGETING.copy().range((float)body.getAttributeValue(Attributes.TEMPT_RANGE));
		List<Player> players = (List<Player>)level.players()
			.stream()
			.filter(EntitySelector.NO_SPECTATORS)
			.filter(playerx -> targeting.test(level, body, playerx))
			.filter(p -> this.playerHoldingTemptation(body, p))
			.filter(playerx -> !body.hasPassenger(playerx))
			.sorted(Comparator.comparingDouble(body::distanceToSqr))
			.collect(Collectors.toList());
		if (!players.isEmpty()) {
			Player player = (Player)players.get(0);
			brain.setMemory(MemoryModuleType.TEMPTING_PLAYER, player);
		} else {
			brain.eraseMemory(MemoryModuleType.TEMPTING_PLAYER);
		}
	}

	private boolean playerHoldingTemptation(final PathfinderMob mob, final Player player) {
		return this.isTemptation(mob, player.getMainHandItem()) || this.isTemptation(mob, player.getOffhandItem());
	}

	private boolean isTemptation(final PathfinderMob mob, final ItemStack itemStack) {
		return this.temptations.test(mob, itemStack);
	}

	@Override
	public Set<MemoryModuleType<?>> requires() {
		return ImmutableSet.of(MemoryModuleType.TEMPTING_PLAYER);
	}
}