package me.mikigal.autopremium.utils;

import org.bukkit.Bukkit;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

/**
 * Created by mikigal on 19.03.2017.
 */
public class FieldUtils {

    public static String bukkitVersion = Bukkit.getServer().getClass().getPackage().getName().substring(23);
    private static Class craftServerClass;
    private static Constructor<?> booleanWrapperConstructor;
    private static Object booleanWrapper;

    static{
        try {
            craftServerClass = Class.forName("org.bukkit.craftbukkit." + bukkitVersion + ".CraftServer");
            booleanWrapperConstructor = craftServerClass.getDeclaredClasses()[0].getDeclaredConstructors()[0];
            booleanWrapperConstructor.setAccessible(true);
            booleanWrapper = booleanWrapperConstructor.newInstance(getCraftServer());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Object getBooleanWrapper(boolean onlineMode){
        set(booleanWrapper, "value", onlineMode);
        return booleanWrapper;
    }
    public static Object getCraftServer(){
        return craftServerClass.cast(Bukkit.getServer());
    }


    /*Basics*/
    public static void set(Object instance, String fieldName, Object newValue){
        try{
            Field nameField = instance.getClass().getDeclaredField(fieldName);
            setValue(instance, nameField, newValue);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    private static void setValue(Object owner, Field field, Object value){
        try{
            makeModifiable(field);
            field.set(owner, value);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    private static void makeModifiable(Field nameField){
        try{
            nameField.setAccessible(true);
            int modifiers = nameField.getModifiers();
            Field modifierField = nameField.getClass().getDeclaredField("modifiers");
            modifiers = modifiers & ~Modifier.FINAL;
            modifierField.setAccessible(true);
            modifierField.setInt(nameField, modifiers);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}