minecraft_25w45a_unobfuscated/net/minecraft/world/entity/npc/WanderingTraderSpawner.java

/*
 * Decompiled with CFR 0.152.
 * 
 * Could not load the following classes:
 *  org.jspecify.annotations.Nullable
 */
package net.minecraft.world.entity.npc;

import java.util.Optional;
import net.minecraft.core.BlockPos;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.server.level.ServerPlayer;
import net.minecraft.tags.BiomeTags;
import net.minecraft.util.Mth;
import net.minecraft.util.RandomSource;
import net.minecraft.world.entity.EntitySpawnReason;
import net.minecraft.world.entity.EntityType;
import net.minecraft.world.entity.SpawnPlacementType;
import net.minecraft.world.entity.SpawnPlacements;
import net.minecraft.world.entity.ai.village.poi.PoiManager;
import net.minecraft.world.entity.ai.village.poi.PoiTypes;
import net.minecraft.world.entity.animal.horse.TraderLlama;
import net.minecraft.world.entity.npc.WanderingTrader;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.CustomSpawner;
import net.minecraft.world.level.LevelReader;
import net.minecraft.world.level.gamerules.GameRules;
import net.minecraft.world.level.levelgen.Heightmap;
import net.minecraft.world.level.storage.ServerLevelData;
import org.jspecify.annotations.Nullable;

public class WanderingTraderSpawner
implements CustomSpawner {
    private static final int DEFAULT_TICK_DELAY = 1200;
    public static final int DEFAULT_SPAWN_DELAY = 24000;
    private static final int MIN_SPAWN_CHANCE = 25;
    private static final int MAX_SPAWN_CHANCE = 75;
    private static final int SPAWN_CHANCE_INCREASE = 25;
    private static final int SPAWN_ONE_IN_X_CHANCE = 10;
    private static final int NUMBER_OF_SPAWN_ATTEMPTS = 10;
    private final RandomSource random = RandomSource.create();
    private final ServerLevelData serverLevelData;
    private int tickDelay;
    private int spawnDelay;
    private int spawnChance;

    public WanderingTraderSpawner(ServerLevelData serverLevelData) {
        this.serverLevelData = serverLevelData;
        this.tickDelay = 1200;
        this.spawnDelay = serverLevelData.getWanderingTraderSpawnDelay();
        this.spawnChance = serverLevelData.getWanderingTraderSpawnChance();
        if (this.spawnDelay == 0 && this.spawnChance == 0) {
            this.spawnDelay = 24000;
            serverLevelData.setWanderingTraderSpawnDelay(this.spawnDelay);
            this.spawnChance = 25;
            serverLevelData.setWanderingTraderSpawnChance(this.spawnChance);
        }
    }

    @Override
    public void tick(ServerLevel level, boolean spawnEnemies) {
        if (!level.getGameRules().get(GameRules.SPAWN_WANDERING_TRADERS).booleanValue()) {
            return;
        }
        if (--this.tickDelay > 0) {
            return;
        }
        this.tickDelay = 1200;
        this.spawnDelay -= 1200;
        this.serverLevelData.setWanderingTraderSpawnDelay(this.spawnDelay);
        if (this.spawnDelay > 0) {
            return;
        }
        this.spawnDelay = 24000;
        int chanceToSpawn = this.spawnChance;
        this.spawnChance = Mth.clamp(this.spawnChance + 25, 25, 75);
        this.serverLevelData.setWanderingTraderSpawnChance(this.spawnChance);
        if (this.random.nextInt(100) > chanceToSpawn) {
            return;
        }
        if (this.spawn(level)) {
            this.spawnChance = 25;
        }
    }

    private boolean spawn(ServerLevel level) {
        ServerPlayer player = level.getRandomPlayer();
        if (player == null) {
            return true;
        }
        if (this.random.nextInt(10) != 0) {
            return false;
        }
        BlockPos playerPos = player.blockPosition();
        int radius = 48;
        PoiManager poiManager = level.getPoiManager();
        Optional<BlockPos> poiPos = poiManager.find(p -> p.is(PoiTypes.MEETING), p -> true, playerPos, 48, PoiManager.Occupancy.ANY);
        BlockPos referencePos = poiPos.orElse(playerPos);
        BlockPos spawnPosition = this.findSpawnPositionNear(level, referencePos, 48);
        if (spawnPosition != null && this.hasEnoughSpace(level, spawnPosition)) {
            if (level.getBiome(spawnPosition).is(BiomeTags.WITHOUT_WANDERING_TRADER_SPAWNS)) {
                return false;
            }
            WanderingTrader trader = EntityType.WANDERING_TRADER.spawn(level, spawnPosition, EntitySpawnReason.EVENT);
            if (trader != null) {
                for (int i = 0; i < 2; ++i) {
                    this.tryToSpawnLlamaFor(level, trader, 4);
                }
                this.serverLevelData.setWanderingTraderId(trader.getUUID());
                trader.setDespawnDelay(48000);
                trader.setWanderTarget(referencePos);
                trader.setHomeTo(referencePos, 16);
                return true;
            }
        }
        return false;
    }

    private void tryToSpawnLlamaFor(ServerLevel level, WanderingTrader trader, int radius) {
        BlockPos spawnPosition = this.findSpawnPositionNear(level, trader.blockPosition(), radius);
        if (spawnPosition == null) {
            return;
        }
        TraderLlama llama = EntityType.TRADER_LLAMA.spawn(level, spawnPosition, EntitySpawnReason.EVENT);
        if (llama == null) {
            return;
        }
        llama.setLeashedTo(trader, true);
    }

    private @Nullable BlockPos findSpawnPositionNear(LevelReader level, BlockPos referencePosition, int radius) {
        BlockPos spawnPosition = null;
        SpawnPlacementType wanderingTraderSpawnType = SpawnPlacements.getPlacementType(EntityType.WANDERING_TRADER);
        for (int i = 0; i < 10; ++i) {
            int zPosition;
            int yPosition;
            int xPosition = referencePosition.getX() + this.random.nextInt(radius * 2) - radius;
            BlockPos spawnPos = new BlockPos(xPosition, yPosition = level.getHeight(Heightmap.Types.WORLD_SURFACE, xPosition, zPosition = referencePosition.getZ() + this.random.nextInt(radius * 2) - radius), zPosition);
            if (!wanderingTraderSpawnType.isSpawnPositionOk(level, spawnPos, EntityType.WANDERING_TRADER)) continue;
            spawnPosition = spawnPos;
            break;
        }
        return spawnPosition;
    }

    private boolean hasEnoughSpace(BlockGetter level, BlockPos spawnPos) {
        for (BlockPos pos : BlockPos.betweenClosed(spawnPos, spawnPos.offset(1, 2, 1))) {
            if (level.getBlockState(pos).getCollisionShape(level, pos).isEmpty()) continue;
            return false;
        }
        return true;
    }
}