gistfile1.txt

package net.minikloon;

import org.bukkit.Chunk;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scheduler.BukkitScheduler;

import java.util.Random;

public class GeneratorBug extends JavaPlugin {
    private final Random rand = new Random();
    private int runs = 0;

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        Player player = (Player) sender;

        BukkitScheduler scheduler = getServer().getScheduler();
        scheduler.runTaskTimer(this, () -> {
            ++runs;

            Chunk playerChunk = player.getLocation().getChunk();
            Chunk chunkFarAway = playerChunk.getWorld().getChunkAt(playerChunk.getX() + 50, playerChunk.getZ());
            Location tpLoc = getSafeLocationInChunk(chunkFarAway, 10);
            if(tpLoc == null) {
                player.sendMessage(runs + " attempts limit reached");
                player.teleport(chunkFarAway.getBlock(0, 100, 0).getLocation());
                return;
            }

            player.teleport(tpLoc);

            Block bottomBlockTped = player.getLocation().getBlock();
            Runnable sendBlockStatus = () -> {
                String status = runs + " " + bottomBlockTped.getType() + " " + bottomBlockTped.getRelative(BlockFace.UP).getType();
                player.sendMessage(status);
            };
            sendBlockStatus.run();
            scheduler.runTaskLater(this, sendBlockStatus, 2L);
        }, 0, 20L);

        return true;
    }

    public Location getSafeLocationInChunk(Chunk chunk, int attempts) {
        for(int attempt = 0; attempt < attempts; ++attempt) {
            Location attemptLoc = chunk.getBlock(rand.nextInt(16), 0, rand.nextInt(16)).getLocation();
            int y = findGroundWithTwoAir(attemptLoc);
            if(y < 0)
                continue;
            attemptLoc.setX(attemptLoc.getBlockX() + 0.5);
            attemptLoc.setY(y);
            attemptLoc.setZ(attemptLoc.getBlockZ() + 0.5);
            return attemptLoc;
        }
        return null;
    }

    public int findGroundWithTwoAir(Location loc) {
        for(int y = 250; y > 0; --y) {
            Block block = loc.getWorld().getBlockAt(loc.getBlockX(), y, loc.getBlockZ());
            Block oneOver = block.getRelative(0, 1, 0);
            Block twoOver = block.getRelative(0, 2, 0);
            if(block.getType().isSolid() && oneOver.getType() == Material.AIR && twoOver.getType() == Material.AIR)
                return y+1;
        }
        return -1;
    }
}