package eu.mikroskeem.utils.bukkit;

import eu.mikroskeem.utils.reflect.Reflect;
import org.bukkit.Bukkit;

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

public class ServerUtils {
    /**
     * Get server's TPS
     *
     * Will use PaperSpigot's API if available, reflection otherwise
     * @return double array of TPS (not rounded!), values are -1 if reflection failed
     */
    public static double[] getTPS(){
        if(Bukkit.getVersion().contains("Paper")) {
            return Bukkit.getTPS();
        } else {
            String bukkitPackageName = Bukkit.getServer().getClass().getPackage().getName();
            String nmsVer = bukkitPackageName.substring(bukkitPackageName.lastIndexOf(".") + 1);

            Class<?> MinecraftServerClass = Reflect.getClass(
                    String.format("net.minecraft.server.%s.MinecraftServer", nmsVer));
            if(MinecraftServerClass != null){
                Method getServer = Reflect.getMethod(MinecraftServerClass, "getServer");
                Field recentTPS = Reflect.getField(MinecraftServerClass, "recentTps");
                if(getServer != null && recentTPS != null){
                    Object server = Reflect.invokeMethod(getServer, null);
                    try {
                        return (double[]) Reflect.readField(recentTPS, server);
                    } catch (NullPointerException e){}
                }
            }
        }
        return new double[]{-1, -1, -1};
    }
}