/*
 * Copyright 2009-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.jdt.groovy.internal.compiler.ast;

import java.util.List;

import org.codehaus.groovy.ast.AnnotationNode;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.Parameter;
import org.codehaus.groovy.ast.stmt.Statement;
import org.eclipse.jdt.internal.compiler.lookup.AnnotationBinding;
import org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.eclipse.jdt.internal.compiler.lookup.MethodBinding;

/**
 * Wraps a JDT MethodBinding, representing it to groovy as a MethodNode. Translates annotations only when required.
 *
 * @author Andy Clement
 */
public class JDTMethodNode extends MethodNode implements JDTNode {

    private MethodBinding methodBinding;
    private JDTResolver resolver;
    private int bits = 0;

    public JDTMethodNode(MethodBinding methodBinding, JDTResolver resolver, String name, int modifiers, ClassNode returnType,
            Parameter[] gParameters, ClassNode[] thrownExceptions, Statement object) {
        super(name, modifiers, returnType, gParameters, thrownExceptions, object);
        this.resolver = resolver;
        this.methodBinding = methodBinding;
    }

    @Override
    public void addAnnotation(AnnotationNode value) {
        // The grails TestMixinTransformation.autoAnnotateSetupTeardown likes to add annotations to immutable objects... (it gets the setup method from a junit class sometimes)
        System.err.println("Unexpected: Trying to add an annotation " + value.getClassNode().getName() + " to an immutable method node " + toString());
        // throwImmutableException();
    }

    @Override
    public void addAnnotations(List<AnnotationNode> annotations) {
        throwImmutableException();
    }

    @Override
    public List<AnnotationNode> getAnnotations() {
        ensureAnnotationsInitialized();
        return super.getAnnotations();
    }

    @Override
    public List<AnnotationNode> getAnnotations(ClassNode type) {
        ensureAnnotationsInitialized();
        return super.getAnnotations(type);
    }

    private void ensureAnnotationsInitialized() {
        if ((bits & ANNOTATIONS_INITIALIZED) == 0) {
            // If the backing declaring entity for the member is not a SourceTypeBinding then the
            // annotations will have already been discarded/lost
            AnnotationBinding[] annotationBindings = methodBinding.getAnnotations();
            for (AnnotationBinding annotationBinding : annotationBindings) {
                super.addAnnotation(new JDTAnnotationNode(annotationBinding, this.resolver));
            }
            bits |= ANNOTATIONS_INITIALIZED;
        }
    }

    private void throwImmutableException() {
        throw new IllegalStateException("JDTMethodNode is immutable");
    }

    public JDTResolver getResolver() {
        return resolver;
    }

    public MethodBinding getMethodBinding() {
        return methodBinding;
    }

    public Binding getJdtBinding() {
        return methodBinding;
    }

    public boolean isDeprecated() {
        return methodBinding.isDeprecated();
    }
}