/*
 * $Id$
 *
 * License Agreement.
 *
 * Rich Faces - Natural Ajax for Java Server Faces (JSF)
 *
 * Copyright (C) 2007 Exadel, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */
package org.richfaces.cdk;

import static org.junit.Assert.assertNotNull;
import japa.parser.JavaParser;
import japa.parser.ParseException;
import japa.parser.ast.CompilationUnit;
import japa.parser.ast.ImportDeclaration;
import japa.parser.ast.body.FieldDeclaration;
import japa.parser.ast.body.MethodDeclaration;
import japa.parser.ast.body.TypeDeclaration;
import japa.parser.ast.body.VariableDeclarator;
import japa.parser.ast.visitor.VoidVisitorAdapter;

import java.io.ByteArrayInputStream;
import java.util.List;

import com.google.common.collect.Lists;

/**
 * <p class="changed_added_4_0">
 * </p>
 *
 * @author asmirnov@exadel.com
 *
 */
public final class JavaSourceParser {
    final class MethodNameVisitor extends VoidVisitorAdapter<String> {
        boolean found = false;

        @Override
        public void visit(MethodDeclaration n, String arg) {
            if (arg.equals(n.getName())) {
                this.found = true;
            }
        }
    }

    final class ImportVisitor extends VoidVisitorAdapter<String> {
        boolean found = false;

        @Override
        public void visit(ImportDeclaration n, String arg) {
            if (arg.equals(n.getName().getName())) {
                this.found = true;
            }
        }
    }

    final class FieldVisitor extends VoidVisitorAdapter<String> {
        boolean found = false;

        @Override
        public void visit(FieldDeclaration n, String arg) {
            for (VariableDeclarator declarator : n.getVariables()) {
                if (arg.equals(declarator.getId().getName())) {
                    this.found = true;
                }
            }
        }
    }

    private final CompilationUnit compiledSource;

    private JavaSourceParser(CompilationUnit compiledSource) {
        this.compiledSource = compiledSource;
    }

    public static JavaSourceParser parse(String javaSource) throws ParseException {
        ByteArrayInputStream inputStream = new ByteArrayInputStream(javaSource.getBytes());
        CompilationUnit compilationUnit = JavaParser.parse(inputStream);
        assertNotNull(compilationUnit);
        return new JavaSourceParser(compilationUnit);
    }

    public boolean containsMethod(String methodName) {
        MethodNameVisitor visitorAdapterExtension = new MethodNameVisitor();
        this.compiledSource.accept(visitorAdapterExtension, methodName);
        return visitorAdapterExtension.found;
    }

    public boolean containsImport(String packageName) {
        ImportVisitor visitorAdapterExtension = new ImportVisitor();
        this.compiledSource.accept(visitorAdapterExtension, packageName);
        return visitorAdapterExtension.found;
    }

    public boolean containsField(String fieldName) {
        FieldVisitor visitorAdapterExtension = new FieldVisitor();
        this.compiledSource.accept(visitorAdapterExtension, fieldName);
        return visitorAdapterExtension.found;
    }

    public String getPackageName() {
        return this.compiledSource.getPakage().getName().getName();
    }

    public Iterable<String> getClassNames() {
        List<String> classNames = Lists.newArrayList();
        List<TypeDeclaration> types = compiledSource.getTypes();
        for (TypeDeclaration typeDeclaration : types) {
            classNames.add(typeDeclaration.getName());
        }
        return classNames;
    }
}