package com.songoda.epicheads.volatilecode.reflection;

import org.bukkit.Bukkit;

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

public final class ReflectionUtils {

	public static String getServerVersion() {
		String name = Bukkit.getServer().getClass().getPackage().getName();
		return name.substring(name.lastIndexOf('.') + 1);
	}

	public static Class<?> getNMSClass(String ClassName) {
		String className = "net.minecraft.server." + getServerVersion() + "." + ClassName;

		try {
			return Class.forName(className);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}

		return null;
	}

	public static Class<?> getCraftBukkitClass(String ClassPackageName) {
		String className = "org.bukkit.craftbukkit." + getServerVersion() + "." + ClassPackageName;

		try {
			return Class.forName(className);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}

		return null;
	}

	public static Constructor<?> getConstructor(Class<?> clazz, Class<?>... params) {
		outer: for (Constructor<?> c : clazz.getDeclaredConstructors()) {
			Class<?>[] para = c.getParameterTypes();

			if (para.length != params.length) {
				continue;
			}

			for (int i = 0; i < para.length; i++) {
				if (!para[i].equals(params[i])) {
					continue outer;
				}
			}

			return c;
		}
		reportNotFound("Could not find constructor in class " + clazz);
		return null;
	}

	public static Method getMethod(Class<?> clazz, String name) {
		for (Method m : clazz.getDeclaredMethods()) {
			if (m.getName().equals(name)) {
				m.setAccessible(true);
				return m;
			}
		}
		reportNotFound("Could not find method " + name + " in class " + clazz);
		return null;
	}

	public static Method getMethod(Class<?> clazz, Class<?> returnType, Class<?>... params) {
		return getMethod(clazz, null, false, returnType, params);
	}

	public static Method getMethod(Class<?> clazz, String name, Class<?> returnType, Class<?>... params) {
		return getMethod(clazz, name, false, returnType, params);
	}

	public static Method getMethod(Class<?> clazz, boolean staticMethod, Class<?> returnType, Class<?>... params) {
		return getMethod(clazz, null, staticMethod, returnType, params);
	}

	public static Method getMethod(Class<?> clazz, String name, boolean staticMethod, Class<?> returnType, Class<?>... params) {
		outer: for (Method m : clazz.getDeclaredMethods()) {
			if (name != null && !m.getName().equals(name)) {
				continue;
			}

			if (staticMethod != Modifier.isStatic(m.getModifiers())) {
				continue;
			}

			if (!m.getReturnType().equals(returnType)) {
				continue;
			}

			Class<?>[] para = m.getParameterTypes();

			if (para.length != params.length) {
				continue;
			}

			for (int i = 0; i < para.length; i++) {
				if (!para[i].equals(params[i])) {
					continue outer;
				}
			}

			return m;
		}
		reportNotFound("Could not find method " + name + " in class " + clazz);
		return null;
	}

	public static void reportNotFound(String message) {
		new Exception(message).printStackTrace();
	}
}