/*
 * Copyright (c) 2012, 2016, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package jdk.javadoc.internal.api;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Locale;
import java.util.Objects;
import java.util.Set;

import javax.lang.model.SourceVersion;
import javax.tools.DiagnosticListener;
import javax.tools.DocumentationTool;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;

import com.sun.tools.javac.api.ClientCodeWrapper;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.file.BaseFileManager;
import com.sun.tools.javac.util.ClientCodeException;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Log;
import jdk.javadoc.internal.tool.ToolOption;

Provides access to functionality specific to the JDK documentation tool,
javadoc.
This is NOT part of any supported API.
If you write code that depends on this, you do so at your own
risk.  This code and its internal interfaces are subject to change
or deletion without notice.
/**
 * Provides access to functionality specific to the JDK documentation tool,
 * javadoc.
 *
 * <p><b>This is NOT part of any supported API.
 * If you write code that depends on this, you do so at your own
 * risk.  This code and its internal interfaces are subject to change
 * or deletion without notice.</b></p>
 */
public class JavadocTool implements DocumentationTool {
    // @Override // can't add @Override until bootstrap JDK provides Tool.name()
    public String name() {
        return "javadoc";
    }

    @Override
    public DocumentationTask getTask(
            Writer out,
            JavaFileManager fileManager,
            DiagnosticListener<? super JavaFileObject> diagnosticListener,
            Class<?> docletClass,
            Iterable<String> options,
            Iterable<? extends JavaFileObject> compilationUnits) {
        Context context = new Context();
        return getTask(out, fileManager, diagnosticListener,
                docletClass, options, compilationUnits, context);
    }

    public DocumentationTask getTask(
            Writer out,
            JavaFileManager fileManager,
            DiagnosticListener<? super JavaFileObject> diagnosticListener,
            Class<?> docletClass,
            Iterable<String> options,
            Iterable<? extends JavaFileObject> compilationUnits,
            Context context) {
        try {
            ClientCodeWrapper ccw = ClientCodeWrapper.instance(context);

            if (options != null) {
                for (String option : options)
                    Objects.requireNonNull(option);
            }

            if (compilationUnits != null) {
                compilationUnits = ccw.wrapJavaFileObjects(compilationUnits); // implicit null check
                for (JavaFileObject cu : compilationUnits) {
                    if (cu.getKind() != JavaFileObject.Kind.SOURCE) {
                        final String kindMsg = "All compilation units must be of SOURCE kind";
                        throw new IllegalArgumentException(kindMsg);
                    }
                }
            }

            if (diagnosticListener != null)
                context.put(DiagnosticListener.class, ccw.wrap(diagnosticListener));

            if (out == null)
                context.put(Log.errKey, new PrintWriter(System.err, true));
            else if (out instanceof PrintWriter)
                context.put(Log.errKey, ((PrintWriter) out));
            else
                context.put(Log.errKey, new PrintWriter(out, true));

            if (fileManager == null) {
                fileManager = getStandardFileManager(diagnosticListener, null, null);
                if (fileManager instanceof BaseFileManager) {
                    ((BaseFileManager) fileManager).autoClose = true;
                }
            }
            fileManager = ccw.wrap(fileManager);
            context.put(JavaFileManager.class, fileManager);

            return new JavadocTaskImpl(context, docletClass, options, compilationUnits);
        } catch (ClientCodeException ex) {
            throw new RuntimeException(ex.getCause());
        }
    }

    // TODO: used shared static method in JavacFileManager
    @Override
    public StandardJavaFileManager getStandardFileManager(
            DiagnosticListener<? super JavaFileObject> diagnosticListener,
            Locale locale,
            Charset charset) {
        Context context = new Context();
        context.put(Locale.class, locale);
        if (diagnosticListener != null)
            context.put(DiagnosticListener.class, diagnosticListener);
        PrintWriter pw = (charset == null)
                ? new PrintWriter(System.err, true)
                : new PrintWriter(new OutputStreamWriter(System.err, charset), true);
        context.put(Log.errKey, pw);
        return new JavacFileManager(context, true, charset);
    }

    @Override
    public int run(InputStream in, OutputStream out, OutputStream err, String... arguments) {
        PrintWriter err_pw = new PrintWriter(err == null ? System.err : err, true);
        PrintWriter out_pw = new PrintWriter(out == null ? System.out : out);
        try {
            return jdk.javadoc.internal.tool.Main.execute(arguments, err_pw);
        } finally {
            err_pw.flush();
            out_pw.flush();
        }
    }

    @Override
    public Set<SourceVersion> getSourceVersions() {
        return Collections.unmodifiableSet(
                EnumSet.range(SourceVersion.RELEASE_3, SourceVersion.latest()));
    }

    @Override
    public int isSupportedOption(String option) {
        if (option == null)
            throw new NullPointerException();
        for (ToolOption o : ToolOption.values()) {
            for (String name : o.names) {
                if (name.equals(option))
                    return o.hasArg ? 1 : 0;
            }
        }
        return -1;
    }

}