/*

 * Copyright (c) 1998, 2018, 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.doclets.formats.html;

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

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

import java.util.*;

import javax.lang.model.element.PackageElement;

import javax.lang.model.element.TypeElement;

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

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

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

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

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

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

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

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

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

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

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

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

/**

 * Generate package usage information.

 *

 *  <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>

 *

 * @author Robert G. Field

 * @author Bhavesh Patel (Modified)

 */

public class PackageUseWriter extends SubWriterHolderWriter {

    final PackageElement packageElement;

    final SortedMap<String, Set<TypeElement>> usingPackageToUsedClasses = new TreeMap<>();

    protected HtmlTree mainTree = HtmlTree.MAIN();

    final String packageUseTableSummary;

    /**

     * Constructor.

     *

     * @param configuration the configuration

     * @param mapper a mapper to provide details of where elements are used

     * @param filename the file to be generated

     * @param pkgElement the package element to be documented

     */

    public PackageUseWriter(HtmlConfiguration configuration,

                            ClassUseMapper mapper, DocPath filename,

                            PackageElement pkgElement) {

        this.packageElement = pkgElement;

        // by examining all classes in this package, find what packages

        // use these classes - produce a map between using package and

        // used classes.

        for (TypeElement usedClass : utils.getEnclosedTypeElements(pkgElement)) {

            Set<TypeElement> usingClasses = mapper.classToClass.get(usedClass);

            if (usingClasses != null) {

                for (TypeElement usingClass : usingClasses) {

                    PackageElement usingPackage = utils.containingPackage(usingClass);

                    Set<TypeElement> usedClasses = usingPackageToUsedClasses

                            .get(utils.getPackageName(usingPackage));

                    if (usedClasses == null) {

                        usedClasses = new TreeSet<>(utils.makeGeneralPurposeComparator());

                        usingPackageToUsedClasses.put(utils.getPackageName(usingPackage),

                                                      usedClasses);

                    }

                    usedClasses.add(usedClass);

                }

            }

        }

        packageUseTableSummary = resources.getText("doclet.Use_Table_Summary",

                resources.getText("doclet.packages"));

    }

    /**

     * Generate a class page.

     *

     * @param configuration the current configuration of the doclet.

     * @param mapper        the mapping of the class usage.

     * @param pkgElement    the package being documented.

     * @throws DocFileIOException if there is a problem generating the package use page

     */

    public static void generate(HtmlConfiguration configuration,

                                ClassUseMapper mapper, PackageElement pkgElement)

            throws DocFileIOException {

        DocPath filename = DocPaths.PACKAGE_USE;

        PackageUseWriter pkgusegen = new PackageUseWriter(configuration, mapper, filename, pkgElement);

        pkgusegen.generatePackageUseFile();

    }

    /**

     * Generate the package use list.

     * @throws DocFileIOException if there is a problem generating the package use page

     */

    protected void generatePackageUseFile() throws DocFileIOException {

        HtmlTree body = getPackageUseHeader();

        HtmlTree div = new HtmlTree(HtmlTag.DIV);

        div.setStyle(HtmlStyle.contentContainer);

        if (usingPackageToUsedClasses.isEmpty()) {

            div.addContent(contents.getContent("doclet.ClassUse_No.usage.of.0", utils.getPackageName(packageElement)));

        } else {

            addPackageUse(div);

        }

        if (configuration.allowTag(HtmlTag.MAIN)) {

            mainTree.addContent(div);

            body.addContent(mainTree);

        } else {

            body.addContent(div);

        }

        HtmlTree tree = (configuration.allowTag(HtmlTag.FOOTER))

                ? HtmlTree.FOOTER()

                : body;

        addNavLinks(false, tree);

        addBottom(tree);

        if (configuration.allowTag(HtmlTag.FOOTER)) {

            body.addContent(tree);

        }

        printHtmlDocument(null, true, body);

    }

    /**

     * Add the package use information.

     *

     * @param contentTree the content tree to which the package use information will be added

     */

    protected void addPackageUse(Content contentTree) {

        HtmlTree ul = new HtmlTree(HtmlTag.UL);

        ul.setStyle(HtmlStyle.blockList);

        if (configuration.packages.size() > 1) {

            addPackageList(ul);

        }

        addClassList(ul);

        contentTree.addContent(ul);

    }

    /**

     * Add the list of packages that use the given package.

     *

     * @param contentTree the content tree to which the package list will be added

     */

    protected void addPackageList(Content contentTree) {

        Content caption = contents.getContent(

                "doclet.ClassUse_Packages.that.use.0",

                getPackageLink(packageElement, utils.getPackageName(packageElement)));

        Table table = new Table(configuration.htmlVersion, HtmlStyle.useSummary)

                .setSummary(packageUseTableSummary)

                .setCaption(caption)

                .setHeader(getPackageTableHeader())

                .setColumnStyles(HtmlStyle.colFirst, HtmlStyle.colLast);

        for (String pkgname: usingPackageToUsedClasses.keySet()) {

            PackageElement pkg = utils.elementUtils.getPackageElement(pkgname);

            Content packageLink = links.createLink(utils.getPackageName(pkg),

                    new StringContent(utils.getPackageName(pkg)));

            Content summary = new ContentBuilder();

            if (pkg != null && !pkg.isUnnamed()) {

                addSummaryComment(pkg, summary);

            } else {

                summary.addContent(Contents.SPACE);

            }

            table.addRow(packageLink, summary);

        }

        Content li = HtmlTree.LI(HtmlStyle.blockList, table.toContent());

        contentTree.addContent(li);

    }

    /**

     * Add the list of classes that use the given package.

     *

     * @param contentTree the content tree to which the class list will be added

     */

    protected void addClassList(Content contentTree) {

        TableHeader classTableHeader = new TableHeader(

                contents.classLabel, contents.descriptionLabel);

        for (String packageName : usingPackageToUsedClasses.keySet()) {

            PackageElement usingPackage = utils.elementUtils.getPackageElement(packageName);

            HtmlTree li = new HtmlTree(HtmlTag.LI);

            li.setStyle(HtmlStyle.blockList);

            if (usingPackage != null) {

                li.addContent(links.createAnchor(utils.getPackageName(usingPackage)));

            }

            String tableSummary = resources.getText("doclet.Use_Table_Summary",

                                                        resources.getText("doclet.classes"));

            Content caption = contents.getContent(

                    "doclet.ClassUse_Classes.in.0.used.by.1",

                    getPackageLink(packageElement, utils.getPackageName(packageElement)),

                    getPackageLink(usingPackage, utils.getPackageName(usingPackage)));

            Table table = new Table(configuration.htmlVersion, HtmlStyle.useSummary)

                    .setSummary(tableSummary)

                    .setCaption(caption)

                    .setHeader(classTableHeader)

                    .setColumnStyles(HtmlStyle.colFirst, HtmlStyle.colLast);

            for (TypeElement te : usingPackageToUsedClasses.get(packageName)) {

                DocPath dp = pathString(te,

                Content stringContent = new StringContent(utils.getSimpleName(te));

                Content typeContent = links.createLink(dp.fragment(getPackageAnchorName(usingPackage)),

                        stringContent);

                Content summary = new ContentBuilder();

                addIndexComment(te, summary);

                table.addRow(typeContent, summary);

            }

            li.addContent(table.toContent());

            contentTree.addContent(li);

        }

    }

    /**

     * Get the header for the package use listing.

     *

     * @return a content tree representing the package use header

     */

    private HtmlTree getPackageUseHeader() {

        String packageText = resources.getText("doclet.Package");

        String name = packageElement.isUnnamed() ? "" : utils.getPackageName(packageElement);

        String title = resources.getText("doclet.Window_ClassUse_Header", packageText, name);

        HtmlTree bodyTree = getBody(true, getWindowTitle(title));

        HtmlTree htmlTree = (configuration.allowTag(HtmlTag.HEADER))

                ? HtmlTree.HEADER()

                : bodyTree;

        addTop(htmlTree);

        addNavLinks(true, htmlTree);

        if (configuration.allowTag(HtmlTag.HEADER)) {

            bodyTree.addContent(htmlTree);

        }

        ContentBuilder headContent = new ContentBuilder();

        headContent.addContent(contents.getContent("doclet.ClassUse_Title", packageText));

        headContent.addContent(new HtmlTree(HtmlTag.BR));

        headContent.addContent(name);

        Content heading = HtmlTree.HEADING(HtmlConstants.TITLE_HEADING, true,

                HtmlStyle.title, headContent);

        Content div = HtmlTree.DIV(HtmlStyle.header, heading);

        if (configuration.allowTag(HtmlTag.MAIN)) {

            mainTree.addContent(div);

        } else {

            bodyTree.addContent(div);

        }

        return bodyTree;

    }

    /**

     * Get the module link.

     *

     * @return a content tree for the module link

     */

    @Override

    protected Content getNavLinkModule() {

        Content linkContent = getModuleLink(utils.elementUtils.getModuleOf(packageElement),

                contents.moduleLabel);

        Content li = HtmlTree.LI(linkContent);

        return li;

    }

    /**

     * Get this package link.

     *

     * @return a content tree for the package link

     */

    @Override

    protected Content getNavLinkPackage() {

        Content linkContent = links.createLink(DocPaths.PACKAGE_SUMMARY,

                contents.packageLabel);

        Content li = HtmlTree.LI(linkContent);

        return li;

    }

    /**

     * Get the use link.

     *

     * @return a content tree for the use link

     */

    @Override

    protected Content getNavLinkClassUse() {

        Content li = HtmlTree.LI(HtmlStyle.navBarCell1Rev, contents.useLabel);

        return li;

    }

    /**

     * Get the tree link.

     *

     * @return a content tree for the tree link

     */

    @Override

    protected Content getNavLinkTree() {

        Content linkContent = links.createLink(DocPaths.PACKAGE_TREE,

                contents.treeLabel);

        Content li = HtmlTree.LI(linkContent);

        return li;

    }

}