package net.minecraft.world.entity.monster;

import java.util.EnumSet;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.sounds.SoundEvents;
import net.minecraft.tags.DamageTypeTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.damagesource.DamageSource;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.ai.attributes.AttributeSupplier;
import net.minecraft.world.entity.ai.attributes.Attributes;
import net.minecraft.world.entity.ai.goal.ClimbOnTopOfPowderSnowGoal;
import net.minecraft.world.entity.ai.goal.FloatGoal;
import net.minecraft.world.entity.ai.goal.Goal;
import net.minecraft.world.entity.ai.goal.MeleeAttackGoal;
import net.minecraft.world.entity.ai.goal.RandomStrollGoal;
import net.minecraft.world.entity.ai.goal.target.HurtByTargetGoal;
import net.minecraft.world.entity.ai.goal.target.NearestAttackableTargetGoal;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.LevelAccessor;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.block.InfestedBlock;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.gamerules.GameRules;
import org.jspecify.annotations.Nullable;

public class Silverfish extends Monster {
	@Nullable
	private Silverfish.SilverfishWakeUpFriendsGoal friendsGoal;

	public Silverfish(final EntityType<? extends Silverfish> type, final Level level) {
		super(type, level);
	}

	@Override
	protected void registerGoals() {
		this.friendsGoal = new Silverfish.SilverfishWakeUpFriendsGoal(this);
		this.goalSelector.addGoal(1, new FloatGoal(this));
		this.goalSelector.addGoal(1, new ClimbOnTopOfPowderSnowGoal(this, this.level()));
		this.goalSelector.addGoal(3, this.friendsGoal);
		this.goalSelector.addGoal(4, new MeleeAttackGoal(this, 1.0, false));
		this.goalSelector.addGoal(5, new Silverfish.SilverfishMergeWithStoneGoal(this));
		this.targetSelector.addGoal(1, new HurtByTargetGoal(this).setAlertOthers());
		this.targetSelector.addGoal(2, new NearestAttackableTargetGoal(this, Player.class, true));
	}

	public static AttributeSupplier.Builder createAttributes() {
		return Monster.createMonsterAttributes().add(Attributes.MAX_HEALTH, 8.0).add(Attributes.MOVEMENT_SPEED, 0.25).add(Attributes.ATTACK_DAMAGE, 1.0);
	}

	@Override
	protected Entity.MovementEmission getMovementEmission() {
		return Entity.MovementEmission.EVENTS;
	}

	@Override
	protected SoundEvent getAmbientSound() {
		return SoundEvents.SILVERFISH_AMBIENT;
	}

	@Override
	protected SoundEvent getHurtSound(final DamageSource source) {
		return SoundEvents.SILVERFISH_HURT;
	}

	@Override
	protected SoundEvent getDeathSound() {
		return SoundEvents.SILVERFISH_DEATH;
	}

	@Override
	protected void playStepSound(final BlockPos pos, final BlockState blockState) {
		this.playSound(SoundEvents.SILVERFISH_STEP, 0.15F, 1.0F);
	}

	@Override
	public boolean hurtServer(final ServerLevel level, final DamageSource source, final float damage) {
		if (this.isInvulnerableTo(level, source)) {
			return false;
		} else {
			if ((source.getEntity() != null || source.is(DamageTypeTags.ALWAYS_TRIGGERS_SILVERFISH)) && this.friendsGoal != null) {
				this.friendsGoal.notifyHurt();
			}

			return super.hurtServer(level, source, damage);
		}
	}

	@Override
	public void tick() {
		this.yBodyRot = this.getYRot();
		super.tick();
	}

	@Override
	public void setYBodyRot(final float yBodyRot) {
		this.setYRot(yBodyRot);
		super.setYBodyRot(yBodyRot);
	}

	@Override
	public float getWalkTargetValue(final BlockPos pos, final LevelReader level) {
		return InfestedBlock.isCompatibleHostBlock(level.getBlockState(pos.below())) ? 10.0F : super.getWalkTargetValue(pos, level);
	}

	public static boolean checkSilverfishSpawnRules(
		final EntityType<Silverfish> type, final LevelAccessor level, final EntitySpawnReason spawnReason, final BlockPos pos, final RandomSource random
	) {
		if (!checkAnyLightMonsterSpawnRules(type, level, spawnReason, pos, random)) {
			return false;
		} else if (EntitySpawnReason.isSpawner(spawnReason)) {
			return true;
		} else {
			Player nearestPlayer = level.getNearestPlayer(pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5, 5.0, true);
			return nearestPlayer == null;
		}
	}

	private static class SilverfishMergeWithStoneGoal extends RandomStrollGoal {
		@Nullable
		private Direction selectedDirection;
		private boolean doMerge;

		public SilverfishMergeWithStoneGoal(final Silverfish silverfish) {
			super(silverfish, 1.0, 10);
			this.setFlags(EnumSet.of(Goal.Flag.MOVE));
		}

		@Override
		public boolean canUse() {
			if (this.mob.getTarget() != null) {
				return false;
			} else if (!this.mob.getNavigation().isDone()) {
				return false;
			} else {
				RandomSource random = this.mob.getRandom();
				if (getServerLevel(this.mob).getGameRules().get(GameRules.MOB_GRIEFING) && random.nextInt(reducedTickDelay(10)) == 0) {
					this.selectedDirection = Direction.getRandom(random);
					BlockPos pos = BlockPos.containing(this.mob.getX(), this.mob.getY() + 0.5, this.mob.getZ()).relative(this.selectedDirection);
					BlockState blockState = this.mob.level().getBlockState(pos);
					if (InfestedBlock.isCompatibleHostBlock(blockState)) {
						this.doMerge = true;
						return true;
					}
				}

				this.doMerge = false;
				return super.canUse();
			}
		}

		@Override
		public boolean canContinueToUse() {
			return this.doMerge ? false : super.canContinueToUse();
		}

		@Override
		public void start() {
			if (!this.doMerge) {
				super.start();
			} else {
				LevelAccessor level = this.mob.level();
				BlockPos pos = BlockPos.containing(this.mob.getX(), this.mob.getY() + 0.5, this.mob.getZ()).relative(this.selectedDirection);
				BlockState blockState = level.getBlockState(pos);
				if (InfestedBlock.isCompatibleHostBlock(blockState)) {
					level.setBlock(pos, InfestedBlock.infestedStateByHost(blockState), 3);
					this.mob.spawnAnim();
					this.mob.discard();
				}
			}
		}
	}

	private static class SilverfishWakeUpFriendsGoal extends Goal {
		private final Silverfish silverfish;
		private int lookForFriends;

		public SilverfishWakeUpFriendsGoal(final Silverfish silverfish) {
			this.silverfish = silverfish;
		}

		public void notifyHurt() {
			if (this.lookForFriends == 0) {
				this.lookForFriends = this.adjustedTickDelay(20);
			}
		}

		@Override
		public boolean canUse() {
			return this.lookForFriends > 0;
		}

		@Override
		public void tick() {
			this.lookForFriends--;
			if (this.lookForFriends <= 0) {
				Level level = this.silverfish.level();
				RandomSource random = this.silverfish.getRandom();
				BlockPos basePos = this.silverfish.blockPosition();

				for (int yOff = 0; yOff <= 5 && yOff >= -5; yOff = (yOff <= 0 ? 1 : 0) - yOff) {
					for (int xOff = 0; xOff <= 10 && xOff >= -10; xOff = (xOff <= 0 ? 1 : 0) - xOff) {
						for (int zOff = 0; zOff <= 10 && zOff >= -10; zOff = (zOff <= 0 ? 1 : 0) - zOff) {
							BlockPos testPos = basePos.offset(xOff, yOff, zOff);
							BlockState blockState = level.getBlockState(testPos);
							if (blockState.getBlock() instanceof InfestedBlock infestedBlock) {
								if (getServerLevel(level).getGameRules().get(GameRules.MOB_GRIEFING)) {
									level.destroyBlock(testPos, true, this.silverfish);
								} else {
									level.setBlock(testPos, infestedBlock.hostStateByInfested(level.getBlockState(testPos)), 3);
								}

								if (random.nextBoolean()) {
									return;
								}
							}
						}
					}
				}
			}
		}
	}
}