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package com.introproventures.graphql.jpa.query.introspection;

import java.util.ArrayList;
import java.util.List;

public class ClassUtil {

    public static Class[] getAllInterfacesAsArray(Class clazz) {
        if (clazz == null) {
            return null;
        }

        List> interfacesFound = new ArrayList<>();
        getAllInterfaces(clazz, interfacesFound);

        return interfacesFound.toArray(new Class[0]);
    }

    private static void getAllInterfaces(Class clazz, List> interfacesFound) {
        while (clazz != null) {
            Class[] interfaces = clazz.getInterfaces();

            for (int i = 0; i < interfaces.length; i++) {
                if (!interfacesFound.contains(interfaces[i])) {
                    interfacesFound.add(interfaces[i]);
                    getAllInterfaces(interfaces[i], interfacesFound);
                }
            }

            clazz = clazz.getSuperclass();
        }
    }

    public static List> getAllInterfaces(Class clazz) {
        if (clazz == null) {
            return null;
        }

        List> interfacesFound = new ArrayList<>();
        getAllInterfaces(clazz, interfacesFound);

        return interfacesFound;
    }

    public static List> getAllSuperclasses(Class clazz) {
        if (clazz == null) {
            return null;
        }
        List> classes = new ArrayList<>();
        Class superclass = clazz.getSuperclass();
        while (superclass != null && superclass != Object.class) {
            classes.add(superclass);
            superclass = superclass.getSuperclass();
        }
        return classes;
    }

    public static Class[] getAllSuperclassesAsArray(Class clazz) {
        if (clazz == null) {
            return null;
        }
        List> classes = new ArrayList<>();
        Class superclass = clazz.getSuperclass();
        while (superclass != null && superclass != Object.class) {
            classes.add(superclass);
            superclass = superclass.getSuperclass();
        }
        return classes.toArray(new Class[0]);
    }
}