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// Copyright © 2013-2015 Esko Luontola 
// This software is released under the Apache License 2.0.
// The license text is at http://www.apache.org/licenses/LICENSE-2.0

package net.orfjackal.retrolambda.interfaces;

import net.orfjackal.retrolambda.lambdas.LambdaNaming;
import org.objectweb.asm.*;
import org.objectweb.asm.tree.MethodNode;

import static net.orfjackal.retrolambda.util.Flags.*;
import static org.objectweb.asm.Opcodes.*;

public class RemoveDefaultMethodBodies extends ClassVisitor {

    public RemoveDefaultMethodBodies(ClassVisitor next) {
        super(ASM5, next);
    }

    @Override
    public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
        if (LambdaNaming.isBodyMethod(access, name)) {
            // lambda impl methods which capture `this` are synthetic instance methods
            return null;
        }
        if (isDefaultMethod(access)) {
            MethodVisitor next = super.visitMethod(access | ACC_ABSTRACT, name, desc, signature, exceptions);
            return new RemoveMethodBody(next, access, name, desc, signature, exceptions);
        } else {
            return super.visitMethod(access, name, desc, signature, exceptions);
        }
    }

    private static boolean isDefaultMethod(int access) {
        return isConcreteMethod(access) && isInstanceMethod(access);
    }

    private static class RemoveMethodBody extends MethodNode {
        private final MethodVisitor next;

        private RemoveMethodBody(MethodVisitor next, int access, String name, String desc, String signature, String[] exceptions) {
            super(ASM5, access, name, desc, signature, exceptions);
            this.next = next;
        }

        @Override
        public void visitEnd() {
            super.visitEnd();
            instructions.clear();
            super.accept(next);
        }
    }
}