package net.minecraft.world.level.levelgen;

import net.minecraft.core.BlockPos;
import net.minecraft.core.Holder;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.tags.BiomeTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.monster.PatrollingMonster;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.level.CustomSpawner;
import net.minecraft.world.level.GameRules;
import net.minecraft.world.level.NaturalSpawner;
import net.minecraft.world.level.biome.Biome;
import net.minecraft.world.level.block.state.BlockState;

public class PatrolSpawner implements CustomSpawner {
	private int nextTick;

	@Override
	public void tick(ServerLevel level, boolean spawnEnemies, boolean spawnFriendlies) {
		if (spawnEnemies) {
			if (level.getGameRules().getBoolean(GameRules.RULE_DO_PATROL_SPAWNING)) {
				RandomSource randomSource = level.random;
				this.nextTick--;
				if (this.nextTick <= 0) {
					this.nextTick = this.nextTick + 12000 + randomSource.nextInt(1200);
					long l = level.getDayTime() / 24000L;
					if (l >= 5L && level.isBrightOutside()) {
						if (randomSource.nextInt(5) == 0) {
							int i = level.players().size();
							if (i >= 1) {
								Player player = (Player)level.players().get(randomSource.nextInt(i));
								if (!player.isSpectator()) {
									if (!level.isCloseToVillage(player.blockPosition(), 2)) {
										int j = (24 + randomSource.nextInt(24)) * (randomSource.nextBoolean() ? -1 : 1);
										int k = (24 + randomSource.nextInt(24)) * (randomSource.nextBoolean() ? -1 : 1);
										BlockPos.MutableBlockPos mutableBlockPos = player.blockPosition().mutable().move(j, 0, k);
										int m = 10;
										if (level.hasChunksAt(mutableBlockPos.getX() - 10, mutableBlockPos.getZ() - 10, mutableBlockPos.getX() + 10, mutableBlockPos.getZ() + 10)) {
											Holder<Biome> holder = level.getBiome(mutableBlockPos);
											if (!holder.is(BiomeTags.WITHOUT_PATROL_SPAWNS)) {
												int n = (int)Math.ceil(level.getCurrentDifficultyAt(mutableBlockPos).getEffectiveDifficulty()) + 1;

												for (int o = 0; o < n; o++) {
													mutableBlockPos.setY(level.getHeightmapPos(Heightmap.Types.MOTION_BLOCKING_NO_LEAVES, mutableBlockPos).getY());
													if (o == 0) {
														if (!this.spawnPatrolMember(level, mutableBlockPos, randomSource, true)) {
															break;
														}
													} else {
														this.spawnPatrolMember(level, mutableBlockPos, randomSource, false);
													}

													mutableBlockPos.setX(mutableBlockPos.getX() + randomSource.nextInt(5) - randomSource.nextInt(5));
													mutableBlockPos.setZ(mutableBlockPos.getZ() + randomSource.nextInt(5) - randomSource.nextInt(5));
												}
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
	}

	private boolean spawnPatrolMember(ServerLevel level, BlockPos pos, RandomSource random, boolean leader) {
		BlockState blockState = level.getBlockState(pos);
		if (!NaturalSpawner.isValidEmptySpawnBlock(level, pos, blockState, blockState.getFluidState(), EntityType.PILLAGER)) {
			return false;
		} else if (!PatrollingMonster.checkPatrollingMonsterSpawnRules(EntityType.PILLAGER, level, EntitySpawnReason.PATROL, pos, random)) {
			return false;
		} else {
			PatrollingMonster patrollingMonster = EntityType.PILLAGER.create(level, EntitySpawnReason.PATROL);
			if (patrollingMonster != null) {
				if (leader) {
					patrollingMonster.setPatrolLeader(true);
					patrollingMonster.findPatrolTarget();
				}

				patrollingMonster.setPos(pos.getX(), pos.getY(), pos.getZ());
				patrollingMonster.finalizeSpawn(level, level.getCurrentDifficultyAt(pos), EntitySpawnReason.PATROL, null);
				level.addFreshEntityWithPassengers(patrollingMonster);
				return true;
			} else {
				return false;
			}
		}
	}
}