package eu.mikroskeem.utils.test.reflect;

import eu.mikroskeem.utils.reflect.Reflect;
import eu.mikroskeem.utils.reflect.Validate;
import org.junit.Test;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Type;

import static eu.mikroskeem.utils.reflect.Validate.ClassDescriptor.newClassDescriptor;
import static eu.mikroskeem.utils.reflect.Validate.MethodDescriptor.newMethodDescriptor;
import static eu.mikroskeem.utils.reflect.Validate.checkClass;
import static eu.mikroskeem.utils.reflect.Validate.checkMethods;
import static org.objectweb.asm.Opcodes.*;

public class TestValidate {
    @Test
    public void testMethodNoArguments() throws Exception {
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
        cw.visit(V1_8, ACC_PUBLIC+ACC_SUPER, "eu/mikroskeem/utils/test/reflect/TestClass1",
                null, Type.getInternalName(Object.class), null);
        String desc = String.format("(%s)%s", "", "V");
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", desc, null, null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(Object.class), "<init>", desc, false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
        desc = String.format("(%s)%s", "", Type.getDescriptor(String.class));
        mv = cw.visitMethod(ACC_PUBLIC, "toString", desc, null, null);
        mv.visitLdcInsn("TestClass1 instance");
        mv.visitInsn(ARETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
        cw.visitEnd();
        Class<?> clazz = Reflect.defineClass(
                ClassLoader.getSystemClassLoader(),
                "eu.mikroskeem.utils.test.reflect.TestClass1",
                cw.toByteArray());
        Validate.ClassDescriptor cd = newClassDescriptor(clazz, Object.class);

        checkClass(cd);
        checkMethods(cd, newMethodDescriptor("toString"));
    }
}