/*
 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.tools.internal.jxc.apt;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.xml.bind.SchemaOutputResolver;
import javax.xml.namespace.QName;
import javax.xml.transform.Result;
import javax.xml.transform.stream.StreamResult;

import com.sun.mirror.apt.AnnotationProcessor;
import com.sun.mirror.apt.AnnotationProcessorEnvironment;
import com.sun.mirror.apt.AnnotationProcessorFactory;
import com.sun.mirror.apt.Filer;
import com.sun.mirror.declaration.AnnotationTypeDeclaration;
import com.sun.mirror.declaration.ClassDeclaration;
import com.sun.mirror.declaration.TypeDeclaration;
import com.sun.tools.internal.xjc.api.J2SJAXBModel;
import com.sun.tools.internal.xjc.api.Reference;
import com.sun.tools.internal.xjc.api.XJC;

/**
 * {@link AnnotationProcessorFactory} that implements the schema generator
 * command line tool.
 *
 * @author Kohsuke Kawaguchi
 */
public class SchemaGenerator implements AnnotationProcessorFactory {

    /**
     * User-specified schema locations, if any.
     */
    private final Map<String,File> schemaLocations = new HashMap<String, File>();

    private File episodeFile;

    public SchemaGenerator() {
    }

    public SchemaGenerator( Map<String,File> m ) {
        schemaLocations.putAll(m);
    }

    public void setEpisodeFile(File episodeFile) {
        this.episodeFile = episodeFile;
    }

    public Collection<String> supportedOptions() {
        return Collections.emptyList();
    }

    public Collection<String> supportedAnnotationTypes() {
        return Arrays.asList("*");
    }

    public AnnotationProcessor getProcessorFor(Set<AnnotationTypeDeclaration> atds, final AnnotationProcessorEnvironment env) {
        return new AnnotationProcessor() {
            final ErrorReceiverImpl errorListener = new ErrorReceiverImpl(env);

            public void process() {
                List<Reference> decls = new ArrayList<Reference>();
                for(TypeDeclaration d : env.getTypeDeclarations()) {
                    // simply ignore all the interface definitions,
                    // so that users won't have to manually exclude interfaces, which is silly.
                    if(d instanceof ClassDeclaration)
                        decls.add(new Reference(d,env));
                }

                J2SJAXBModel model = XJC.createJavaCompiler().bind(decls,Collections.<QName,Reference>emptyMap(),null,env);
                if(model==null)
                    return; // error

                try {
                    model.generateSchema(
                        new SchemaOutputResolver() {
                            public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException {
                                File file;
                                OutputStream out;
                                if(schemaLocations.containsKey(namespaceUri)) {
                                    file = schemaLocations.get(namespaceUri);
                                    if(file==null)  return null;    // don't generate
                                    out = new FileOutputStream(file);
                                } else {
                                    // use the default
                                    file = new File(suggestedFileName);
                                    out = env.getFiler().createBinaryFile(Filer.Location.CLASS_TREE,"",file);
                                    file = file.getAbsoluteFile();
                                }

                                StreamResult ss = new StreamResult(out);
                                env.getMessager().printNotice("Writing "+file);
                                ss.setSystemId(file.toURL().toExternalForm());
                                return ss;
                            }
                        }, errorListener);

                    if(episodeFile!=null) {
                        env.getMessager().printNotice("Writing "+episodeFile);
                        model.generateEpisodeFile(new StreamResult(episodeFile));
                    }
                } catch (IOException e) {
                    errorListener.error(e.getMessage(),e);
                }
            }
        };
    }
}
