/*
 * Copyright 2001-2013 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.jetbrains.java.generate.config;

import com.intellij.openapi.editor.Editor;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiMethod;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.java.generate.psi.PsiAdapter;

/**
 * Inserts the method last in the javafile.
 */
public final class InsertLastStrategy implements InsertNewMethodStrategy {

    private static final InsertLastStrategy instance = new InsertLastStrategy();

    private InsertLastStrategy() {}

    public static InsertLastStrategy getInstance() {
        return instance;
    }

    @Override
    public PsiMethod insertNewMethod(PsiClass clazz, @NotNull PsiMethod newMethod, Editor editor) {

        // if main method exists and is the last then add toString just before main method
        PsiMethod mainMethod = PsiAdapter.findPublicStaticVoidMainMethod(clazz);
        if (mainMethod != null) {
            // add before main method if it is the last method
            PsiMethod[] methods = clazz.getMethods();
            if (mainMethod.equals(methods[methods.length - 1])) {
                return (PsiMethod) clazz.addBefore(newMethod, mainMethod);  // return as the method is added
            }
        }

        // otherwise add it at the end
        PsiElement last = clazz.getRBrace(); // rbrace is the last } java token. fixes bug #9
        return (PsiMethod) clazz.addBefore(newMethod, last);
    }

    @Override
    public String toString() {
        return "Last";
    }
}
