import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import net.minecraft.server.v1_8_R3.EntityHorse;
import net.minecraft.server.v1_8_R3.EntityPlayer;
import net.minecraft.server.v1_8_R3.EntityWitherSkull;
import net.minecraft.server.v1_8_R3.PacketPlayOutAttachEntity;
import net.minecraft.server.v1_8_R3.PacketPlayOutEntityDestroy;
import net.minecraft.server.v1_8_R3.PacketPlayOutSpawnEntityLiving;
import net.minecraft.server.v1_8_R3.WorldServer;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_8_R3.CraftWorld;
import org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer;
import org.bukkit.entity.Player;

public class Hologram {
private static final double distance = 0.23;
private List<String> lines = new ArrayList<String>();
private List<Integer> ids = new ArrayList<Integer>();
private boolean showing = false;
private Location location;

public Hologram(String... lines) {
    this.lines.addAll(Arrays.asList(lines));
}

public void show(Player p, Location loc) {
    if (showing == true) {
      try {
          throw new Exception("Is already showing!");
      } catch (Exception e) {
          e.printStackTrace();
      }
    }
    Location first = loc.clone().add(0, (this.lines.size() / 2) * distance, 0);
    for (int i = 0; i < this.lines.size(); i++) {
      ids.addAll(showLine(p, first.clone(), this.lines.get(i)));
      first.subtract(0, distance, 0);
    }
    showing = true;
    this.location = loc;
}

public void destroy() {
    if (showing == false) {
      try {
          throw new Exception("Isn't showing!");
      } catch (Exception e) {
          e.printStackTrace();
      }
    }
    int[] ints = new int[this.ids.size()];
    for (int j = 0; j < ints.length; j++) {
      ints[j] = ids.get(j);
    }
    PacketPlayOutEntityDestroy packet = new PacketPlayOutEntityDestroy(ints);
    for (Player player : Bukkit.getOnlinePlayers()) {
      ((CraftPlayer) player).getHandle().playerConnection.sendPacket(packet);
    }
    showing = false;
    this.location = null;
}

private static List<Integer> showLine(Player p, Location loc, String text) {
    WorldServer world = ((CraftWorld) loc.getWorld()).getHandle();
    EntityWitherSkull skull = new EntityWitherSkull(world);
    skull.setLocation(loc.getX(), loc.getY() + 1 + 55, loc.getZ(), 0, 0);
    ((CraftWorld) loc.getWorld()).getHandle().addEntity(skull);

    EntityHorse horse = new EntityHorse(world);
    horse.setLocation(loc.getX(), loc.getY() + 55, loc.getZ(), 0, 0);
    horse.setAge(-1700000);
    horse.setCustomName(text);
    horse.setCustomNameVisible(true);
    PacketPlayOutSpawnEntityLiving packedt = new PacketPlayOutSpawnEntityLiving(horse);
      EntityPlayer nmsPlayer = ((CraftPlayer) p).getHandle();
      nmsPlayer.playerConnection.sendPacket(packedt);

      PacketPlayOutAttachEntity pa = new PacketPlayOutAttachEntity(0, horse, skull);
      nmsPlayer.playerConnection.sendPacket(pa);
    return Arrays.asList(skull.getId(), horse.getId());
}
}