/*

 * Copyright (c) 2017, 2019, 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 jdk.javadoc.internal.doclets.formats.html;

import com.sun.source.doctree.DocTree;

import com.sun.source.doctree.EndElementTree;

import com.sun.source.doctree.StartElementTree;

import com.sun.source.doctree.TextTree;

import com.sun.source.util.DocTreeFactory;

import com.sun.tools.doclint.HtmlTag;

import jdk.javadoc.internal.doclets.formats.html.markup.HtmlTree;

import jdk.javadoc.internal.doclets.formats.html.markup.Navigation;

import jdk.javadoc.internal.doclets.toolkit.Content;

import jdk.javadoc.internal.doclets.toolkit.DocFileElement;

import jdk.javadoc.internal.doclets.toolkit.DocFilesHandler;

import jdk.javadoc.internal.doclets.toolkit.util.DocFile;

import jdk.javadoc.internal.doclets.toolkit.util.DocFileIOException;

import jdk.javadoc.internal.doclets.toolkit.util.DocPath;

import jdk.javadoc.internal.doclets.toolkit.util.DocPaths;

import jdk.javadoc.internal.doclets.toolkit.util.DocletConstants;

import jdk.javadoc.internal.doclets.toolkit.util.Utils;

import javax.lang.model.element.Element;

import javax.lang.model.element.ModuleElement;

import javax.lang.model.element.PackageElement;

import javax.tools.FileObject;

import javax.tools.JavaFileManager.Location;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import jdk.javadoc.internal.doclets.formats.html.markup.Navigation.PageMode;

public class DocFilesHandlerImpl implements DocFilesHandler {

    public final Element element;

    public final Location location;

    public final DocPath  source;

    public final HtmlConfiguration configuration;

    private Navigation navBar;

    /**

     * Constructor to construct the DocFilesWriter object.

     *

     * @param configuration the configuration of this doclet.

     * @param element the containing element of the doc-files.

     *

     */

    public DocFilesHandlerImpl(HtmlConfiguration configuration, Element element) {

        this.configuration = configuration;

        this.element = element;

        switch (element.getKind()) {

            case MODULE:

                ModuleElement mdle = (ModuleElement)element;

                location = configuration.utils.getLocationForModule(mdle);

                source = DocPaths.DOC_FILES;

                break;

            case PACKAGE:

                PackageElement pkg = (PackageElement)element;

                location = configuration.utils.getLocationForPackage(pkg);

                // Note, given that we have a module-specific location,

                // we want a module-relative path for the source, and not the

                // standard path that may include the module directory

                source = DocPath.create(pkg.getQualifiedName().toString().replace('.', '/'))

                        .resolve(DocPaths.DOC_FILES);

                break;

            default:

                throw new AssertionError("unsupported element " + element);

        }

    }

    /**

     * Copy doc-files directory and its contents from the source

     * elements directory to the generated documentation directory.

     *

     * @throws DocFileIOException if there is a problem while copying

     *         the documentation files

     */

    public void copyDocFiles()  throws DocFileIOException {

        boolean first = true;

        for (DocFile srcdir : DocFile.list(configuration, location, source)) {

            if (!srcdir.isDirectory()) {

                continue;

            }

            DocPath path = null;

            switch (this.element.getKind()) {

                case MODULE:

                    path = DocPaths.forModule((ModuleElement)this.element);

                    break;

                case PACKAGE:

                    path = configuration.docPaths.forPackage((PackageElement)this.element);

                    break;

                default:

                    throw new AssertionError("unknown kind:" + this.element.getKind());

            }

            copyDirectory(srcdir, path.resolve(DocPaths.DOC_FILES), first);

            first = false;

        }

    }

    public List<DocPath> getStylesheets() throws DocFileIOException {

        List<DocPath> stylesheets = new ArrayList<DocPath>();

        for (DocFile srcdir : DocFile.list(configuration, location, source)) {

            for (DocFile srcFile : srcdir.list()) {

                if (srcFile.getName().endsWith(".css"))

                    stylesheets.add(DocPaths.DOC_FILES.resolve(srcFile.getName()));

            }

        }

        return stylesheets;

    }

    private void copyDirectory(DocFile srcdir, final DocPath dstDocPath,

                               boolean first) throws DocFileIOException {

        DocFile dstdir = DocFile.createFileForOutput(configuration, dstDocPath);

        if (srcdir.isSameFile(dstdir)) {

            return;

        }

        for (DocFile srcfile: srcdir.list()) {

            DocFile destfile = dstdir.resolve(srcfile.getName());

            if (srcfile.isFile()) {

                if (destfile.exists() && !first) {

                    configuration.messages.warning("doclet.Copy_Overwrite_warning",

                            srcfile.getPath(), dstdir.getPath());

                } else {

                    if (Utils.toLowerCase(srcfile.getPath()).endsWith(".html")) {

                        handleHtmlFile(srcfile, dstDocPath);

                    } else {

                        configuration.messages.notice("doclet.Copying_File_0_To_Dir_1",

                                srcfile.getPath(), dstdir.getPath());

                        destfile.copyFile(srcfile);

                    }

                }

            } else if (srcfile.isDirectory()) {

                if (configuration.copydocfilesubdirs

                        && !configuration.shouldExcludeDocFileDir(srcfile.getName())) {

                    DocPath dirDocPath = dstDocPath.resolve(srcfile.getName());

                    copyDirectory(srcfile, dirDocPath, first);

                }

            }

        }

    }

    private void handleHtmlFile(DocFile srcfile, DocPath dstPath) throws DocFileIOException {

        Utils utils = configuration.utils;

        FileObject fileObject = srcfile.getFileObject();

        DocFileElement dfElement = new DocFileElement(utils, element, fileObject);

        DocPath dfilePath = dstPath.resolve(srcfile.getName());

        HtmlDocletWriter docletWriter = new DocFileWriter(configuration, dfilePath, element);

        configuration.messages.notice("doclet.Generating_0", docletWriter.filename.getPath());

        List<? extends DocTree> localTags = getLocalHeaderTags(utils.getPreamble(dfElement));

        Content localTagsContent = docletWriter.commentTagsToContent(null, dfElement, localTags, false);

        String title = getWindowTitle(docletWriter, dfElement).trim();

        HtmlTree htmlContent = docletWriter.getBody(title);

        PackageElement pkg = dfElement.getPackageElement();

        Content mdleLinkContent = docletWriter.getModuleLink(utils.elementUtils.getModuleOf(pkg),

                docletWriter.contents.moduleLabel);

        navBar.setNavLinkModule(mdleLinkContent);

        Content pkgLinkContent = docletWriter.getPackageLink(pkg, docletWriter.contents.packageLabel);

        navBar.setNavLinkPackage(pkgLinkContent);

        navBar.setUserHeader(docletWriter.getUserHeaderFooter(true));

        List<? extends DocTree> fullBody = utils.getFullBody(dfElement);

        navBar.setUserFooter(docletWriter.getUserHeaderFooter(false));

        Content footer = HtmlTree.FOOTER();

        footer.add(navBar.getContent(false));

        docletWriter.addBottom(footer);

        docletWriter.printHtmlDocument(Collections.emptyList(), null, localTagsContent, Collections.emptyList(), htmlContent);

    }

    private List<? extends DocTree> getLocalHeaderTags(List<? extends DocTree> dtrees) {

        List<DocTree> localTags = new ArrayList<>();

        DocTreeFactory docTreeFactory = configuration.docEnv.getDocTrees().getDocTreeFactory();

        boolean inHead = false;

        boolean inTitle = false;

        loop:

        for (DocTree dt : dtrees) {

            switch (dt.getKind()) {

                case START_ELEMENT:

                    StartElementTree startElem = (StartElementTree)dt;

                    switch (HtmlTag.get(startElem.getName())) {

                        case HEAD:

                            inHead = true;

                            break;

                        case META:

                            break;

                        case TITLE:

                            inTitle = true;

                            break;

                        default:

                            if (inHead) {

                                localTags.add(startElem);

                                localTags.add(docTreeFactory.newTextTree(DocletConstants.NL));

                            }

                    }

                    break;

                case END_ELEMENT:

                    EndElementTree endElem = (EndElementTree)dt;

                    switch (HtmlTag.get(endElem.getName())) {

                        case HEAD:

                            inHead = false;

                            break loop;

                        case TITLE:

                            inTitle = false;

                            break;

                        default:

                            if (inHead) {

                                localTags.add(endElem);

                                localTags.add(docTreeFactory.newTextTree(DocletConstants.NL));

                            }

                    }

                    break;

                case ENTITY:

                case TEXT:

                    if (inHead && !inTitle) {

                        localTags.add(dt);

                    }

                    break;

            }

        }

        return localTags;

    }

    private String getWindowTitle(HtmlDocletWriter docletWriter, Element element) {

        List<? extends DocTree> preamble = configuration.utils.getPreamble(element);

        StringBuilder sb = new StringBuilder();

        boolean titleFound = false;

        loop:

        for (DocTree dt : preamble) {

            switch (dt.getKind()) {

                case START_ELEMENT:

                    StartElementTree nodeStart = (StartElementTree)dt;

                    if (Utils.toLowerCase(nodeStart.getName().toString()).equals("title")) {

                        titleFound = true;

                    }

                    break;

                case END_ELEMENT:

                    EndElementTree nodeEnd = (EndElementTree)dt;

                    if (Utils.toLowerCase(nodeEnd.getName().toString()).equals("title")) {

                        break loop;

                    }

                    break;

                case TEXT:

                    TextTree nodeText = (TextTree)dt;

                    if (titleFound)

                        sb.append(nodeText.getBody());

                    break;

                default:

                    // do nothing

            }

        }

        return docletWriter.getWindowTitle(sb.toString().trim());

    }

    private static class DocFileWriter extends HtmlDocletWriter {

        /**

         * Constructor to construct the HtmlDocletWriter object.

         *

         * @param configuration the configuruation of this doclet.

         * @param path          the file to be generated.

         * @param e             the anchoring element.

         */

        public DocFileWriter(HtmlConfiguration configuration, DocPath path, Element e) {

            super(configuration, path);

            switch (e.getKind()) {

                case PACKAGE:

                case MODULE:

                    break;

                default:

                    throw new AssertionError("unsupported element: " + e.getKind());

            }

        }

    }

}