package eu.mikroskeem.utils.bukkit;

import eu.mikroskeem.utils.reflect.Reflect;
import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.jetbrains.annotations.NotNull;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class PlayerUtils {
    /**
     * Return player ping (via NMS reflection)
     *
     * Note: I'm bit disappointed, that Bukkit API doesn't expose method to get player's ping
     *
     * @param player Player who ping to query
     * @return Player's ping (-1 if reflection failed)
     */
    public static int getNMSPing(@NotNull Player player){
        int ping = -1;

        String bukkitPackageName = Bukkit.getServer().getClass().getPackage().getName();
        String nmsVer = bukkitPackageName.substring(bukkitPackageName.lastIndexOf(".") + 1);

        Class<?> craftPlayerClass = Reflect.getClass(
                String.format("org.bukkit.craftbukkit.%s.entity.CraftPlayer", nmsVer));
        Class<?> craftEntityPlayerClass = Reflect.getClass(
                String.format("net.minecraft.server.%s.EntityPlayer", nmsVer));

        if(craftPlayerClass != null && craftEntityPlayerClass != null){
            Method getHandle = Reflect.getMethod(craftPlayerClass, "getHandle");
            if(getHandle != null){
                Object handle = Reflect.invokeMethod(getHandle, player);
                if(handle != null){
                    Field pingField = Reflect.getField(craftEntityPlayerClass, "ping");
                    if(pingField != null){
                        Integer nmsPing = (Integer)Reflect.readField(pingField, handle);
                        if(nmsPing != null){
                            return nmsPing;
                        }
                    }
                }
            }
        }
        return ping;
    }
}