public class Core extends JavaPlugin implements CommandExecutor {

    @Override
    public void onEnable() {
        getCommand("npc").setExecutor(this);
    }

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if(args.length != 2) return true;
        String option = args[0];
        String nick = args[1];
        if(option.equals("create")) {
            Player p = (Player) sender;
            createNPC(nick, p.getLocation());
        }else{
            return true;
        }

        return false;
    }

    public void createNPC(String name, Location loc){
        MinecraftServer nmsServer = ((CraftServer) Bukkit.getServer()).getServer();
        WorldServer nmsWorld = ((CraftWorld)Bukkit.getWorld("world")).getHandle();
        GameProfile gameProfile = new GameProfile(UUID.randomUUID(), name);
        String[] skin = getSkin(name);
        gameProfile.getProperties().put("textures", new Property("textures", skin[0], skin[1]));
        EntityPlayer npc = new EntityPlayer(nmsServer, nmsWorld, gameProfile, new PlayerInteractManager(nmsWorld));
        npc.setLocation(loc.getX(), loc.getY(), loc.getZ(), loc.getYaw(), loc.getPitch());

        for(Player p : Bukkit.getOnlinePlayers()) {
            PlayerConnection connection = ((CraftPlayer)p).getHandle().playerConnection;
            connection.sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, npc));
            connection.sendPacket(new PacketPlayOutNamedEntitySpawn(npc));
            connection.sendPacket(new PacketPlayOutEntityHeadRotation(npc, (byte) (npc.yaw * 256 / 360)));
            connection.sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER, npc));
        }
    }

    private static String[] getSkin(String name) {
        try {
            URL url = new URL("https://api.mojang.com/users/profiles/minecraft/" + name);
            InputStreamReader reader = new InputStreamReader(url.openStream());
            String uuid = (new JsonParser()).parse(reader).getAsJsonObject().get("id").getAsString();
            URL url2 = new URL("https://sessionserver.mojang.com/session/minecraft/profile/" + uuid + "?unsigned=false");
            InputStreamReader reader2 = new InputStreamReader(url2.openStream());
            JsonObject property = (new JsonParser()).parse(reader2).getAsJsonObject().get("properties").getAsJsonArray().get(0).getAsJsonObject();
            String texture = property.get("value").getAsString();
            String signature = property.get("signature").getAsString();
            return new String[] { texture, signature };
        } catch (Exception e) {
            return null;
        }
    }
}