package eu.mikroskeem.utils.bukkit;

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

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

import static com.google.common.base.Preconditions.checkNotNull;
import static eu.mikroskeem.utils.bukkit.ServerUtils.getNmsVersion;

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){
        try {
            String nmsVer = getNmsVersion();
            Class<?> craftPlayerClass = checkNotNull(Reflect.getClass(
                    String.format("org.bukkit.craftbukkit.%s.entity.CraftPlayer", nmsVer)));
            Class<?> craftEntityPlayerClass = checkNotNull(Reflect.getClass(
                    String.format("net.minecraft.server.%s.EntityPlayer", nmsVer)));
            Method getHandle = checkNotNull(Reflect.getMethod(craftPlayerClass, "getHandle"));
            Object handle = checkNotNull(Reflect.invokeMethod(getHandle, player));
            Field pingField = checkNotNull(Reflect.getField(craftEntityPlayerClass, "ping"));
            return (Integer) checkNotNull(Reflect.readField(pingField, handle));
        }
        catch (NullPointerException ignored){
            return -1;
        }
    }
}