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/*
  main.cpp
*/

#include <qglobal.h>
#include <QtCore>
#include <stdlib.h>
#include "apigenerator.h"
#include "codemarker.h"
#include "codeparser.h"
#include "config.h"
#include "cppcodemarker.h"
#include "cppcodeparser.h"
#include "cpptoqsconverter.h"
#include "doc.h"
#include "htmlgenerator.h"
#include "jambiapiparser.h"
#include "javacodemarker.h"
#include "javadocgenerator.h"
#include "linguistgenerator.h"
#include "loutgenerator.h"
#include "mangenerator.h"
#include "plaincodemarker.h"
#include "polyarchiveextractor.h"
#include "polyuncompressor.h"
#include "qsakernelparser.h"
#include "qscodemarker.h"
#include "qscodeparser.h"
#include "sgmlgenerator.h"
#include "webxmlgenerator.h"
#include "tokenizer.h"
#include "tree.h"

QT_BEGIN_NAMESPACE

/*
  The default indent for code is 4.
  The default value for false is 0.
  The default language is c++.
  The default output format is html.
  The default tab size is 8.
  And those are all the default values for configuration variables.
 */
static const struct {
    const char *key;
    const char *value;
} defaults[] = {
    { CONFIG_CODEINDENT, "4" },
    { CONFIG_FALSEHOODS, "0" },
    { CONFIG_LANGUAGE, "Cpp" },
    { CONFIG_OUTPUTFORMATS, "HTML" },
    { CONFIG_TABSIZE, "8" },
    { 0, 0 }
};

static bool slow = false;
static QStringList defines;
static QHash<QString, Tree *> trees;

/*!
  Find the Tree for language \a lang and return a pointer to it.
  If there is no Tree for language \a lang in the Tree table, add
  a new one. The Tree table is indexed by \a lang strings.
 */
static Tree* treeForLanguage(const QString &lang)
{
    Tree* tree = trees.value(lang);
    if (tree == 0) {
        tree = new Tree;
        trees.insert( lang, tree );
    }
    return tree;
}

/*!
  Print the help message to \c stdout.
 */
static void printHelp()
{
    Location::information(tr("Usage: qdoc [options] file1.qdocconf ...\n"
                              "Options:\n"
                              "    -help     "
                              "Display this information and exit\n"
                              "    -version  "
                              "Display version of qdoc and exit\n"
                              "    -D<name>  "
                              "Define <name> as a macro while parsing sources\n"
                              "    -slow     "
                              "Turn on features that slow down qdoc") );
}

/*!
  Prints the qdoc version number to stdout.
 */
static void printVersion()
{
    QString s = QString(tr("qdoc version ")) + QString(QT_VERSION_STR);
    Location::information(s);
}

/*!
  Processes the qdoc config file \a fileName. This is the
  controller for all of qdoc.
 */
static void processQdocconfFile(const QString &fileName)
{
    QList<QTranslator *> translators;

    /*
      The Config instance represents the configuration data for qdoc.
      All the other classes are initialized with the config. Here we
      initialize the configuration with some default values.
     */
    Config config(tr("qdoc"));
    int i = 0;
    while (defaults[i].key) {
	config.setStringList(defaults[i].key,
                             QStringList() << defaults[i].value);
	++i;
    }
    config.setStringList(CONFIG_SLOW, QStringList(slow ? "true" : "false"));

    /*
      With the default configuration values in place, load
      the qdoc configuration file. Note that the configuration
      file may include other configuration files.

      The Location class keeps track of the current location
      in the file being processed, mainly for error reporting
      purposes.
     */
    Location::initialize(config);
    config.load(fileName);

    /*
      Add the defines to the configuration variables.
     */
    QStringList defs = defines + config.getStringList(CONFIG_DEFINES);
    config.setStringList(CONFIG_DEFINES,defs);
    Location::terminate();

    QString prevCurrentDir = QDir::currentPath();
    QString dir = QFileInfo(fileName).path();
    if (!dir.isEmpty())
	QDir::setCurrent(dir);

    /*
      Initialize all the classes and data structures with the
      qdoc configuration.
     */
    Location::initialize(config);
    Tokenizer::initialize(config);
    Doc::initialize(config);
    CppToQsConverter::initialize(config);
    CodeMarker::initialize(config);
    CodeParser::initialize(config);
    Generator::initialize(config);

    /*
      Load the language translators, if the configuration specifies any.
     */
    QStringList fileNames = config.getStringList(CONFIG_TRANSLATORS);
    QStringList::Iterator fn = fileNames.begin();
    while (fn != fileNames.end()) {
	QTranslator *translator = new QTranslator(0);
	if (!translator->load(*fn))
	    config.lastLocation().error(tr("Cannot load translator '%1'")
					 .arg(*fn));
	QCoreApplication::instance()->installTranslator(translator);
	translators.append(translator);
	++fn;
    }

    //QSet<QString> outputLanguages = config.getStringSet(CONFIG_OUTPUTLANGUAGES);

    /*
      Get the source language (Cpp) from the configuration
      and the location in the configuration file where the
      source language was set.
     */
    QString lang = config.getString(CONFIG_LANGUAGE);
    Location langLocation = config.lastLocation();

    /*
      Initialize the tree where all the parsed sources will be stored.
      The tree gets built as the source files are parsed, and then the
      documentation output is generated by traversing the tree.
     */
    Tree *tree = new Tree;
    tree->setVersion(config.getString(CONFIG_VERSION));

    /*
      There must be a code parser for the source code language, e.g. C++.
      If there isn't one, give up.
     */
    CodeParser *codeParser = CodeParser::parserForLanguage(lang);
    if (codeParser == 0)
        config.lastLocation().fatal(tr("Cannot parse programming language '%1'").arg(lang));

    /*
      By default, the only output format is HTML.
     */
    QSet<QString> outputFormats = config.getStringSet(CONFIG_OUTPUTFORMATS);
    Location outputFormatsLocation = config.lastLocation();

    /*
      There must be a code marker for the source code language, e.g. C++.
      If there isn't one, give up.
     */
    CodeMarker *marker = CodeMarker::markerForLanguage(lang);
    if (!marker && !outputFormats.isEmpty())
	langLocation.fatal(tr("Cannot output documentation for programming language '%1'").arg(lang));

    /*
      Read some XML indexes. What are they??? 
     */
    QStringList indexFiles = config.getStringList(CONFIG_INDEXES);
    tree->readIndexes(indexFiles);
    
    /*
      Get all the header files: "*.ch *.h *.h++ *.hh *.hpp *.hxx"
      Put them in a set.
     */
    QSet<QString> excludedDirs;
    QStringList excludedDirsList = config.getStringList(CONFIG_EXCLUDEDIRS);
    foreach (const QString &excludeDir, excludedDirsList)
        excludedDirs.insert(QDir::fromNativeSeparators(excludeDir));
    QSet<QString> headers = QSet<QString>::fromList(
        config.getAllFiles(CONFIG_HEADERS, CONFIG_HEADERDIRS,
                           codeParser->headerFileNameFilter(),
                           excludedDirs));

    /*
      Parse each header file in the set and add it to the big tree.
     */
    QSet<QString>::ConstIterator h = headers.begin();
    while (h != headers.end()) {
	codeParser->parseHeaderFile(config.location(), *h, tree);
	++h;
    }
    codeParser->doneParsingHeaderFiles(tree);

    /*
      Get all the source text files: "*.cpp *.qdoc *.mm"
      Put them in a set.
     */
    QSet<QString> sources = QSet<QString>::fromList(
        config.getAllFiles(CONFIG_SOURCES, CONFIG_SOURCEDIRS,
                           codeParser->sourceFileNameFilter(),
                           excludedDirs));

    /*
      Parse each source text file in the set and add it to the big tree.
     */
    QSet<QString>::ConstIterator s = sources.begin();
    while (s != sources.end()) {
	codeParser->parseSourceFile(config.location(), *s, tree);
	++s;
    }
    codeParser->doneParsingSourceFiles(tree);

    /*
      Now the big tree has been built from all the header and
      source files. Resolve all the class names, function names,
      targets, URLs, links, and other stuff that needs resolving.
     */
    tree->resolveGroups();
    tree->resolveTargets();

    /*
      Now the tree has been built, and all the stuff that needed
      resolving has been resolved. Now it is time to traverse
      the big tree and generate the documentation output.
     */
    QSet<QString>::ConstIterator of = outputFormats.begin();
    while (of != outputFormats.end()) {
        Generator *generator = Generator::generatorForFormat(*of);
        if (generator == 0)
            outputFormatsLocation.fatal(tr("Unknown output format '%1'")
                                        .arg(*of));
        generator->generateTree(tree, marker);
        ++of;
    }

    /*
      Generate the XML tag file, if it was requested.
     */
    QString tagFile = config.getString(CONFIG_TAGFILE);
    if (!tagFile.isEmpty())
        tree->generateTagFile(tagFile);
    
    tree->setVersion("");
    Generator::terminate();
    CodeParser::terminate();
    CodeMarker::terminate();
    CppToQsConverter::terminate();
    Doc::terminate();
    Tokenizer::terminate();
    Location::terminate();
    QDir::setCurrent(prevCurrentDir);

    foreach (QTranslator *translator, translators)
        delete translator;

    delete tree;
}

QT_END_NAMESPACE

int main(int argc, char **argv)
{
    QT_USE_NAMESPACE

    QCoreApplication app(argc, argv);
    QString cf = "qsauncompress \1 \2";
    PolyArchiveExtractor qsaExtractor(QStringList() << "qsa",cf);
    cf = "tar -C \2 -xf \1";
    PolyArchiveExtractor tarExtractor(QStringList() << "tar",cf);
    cf = "tar -C \2 -Zxf \1";
    PolyArchiveExtractor tazExtractor(QStringList() << "taz",cf);
    cf = "tar -C \2 -jxf \1";
    PolyArchiveExtractor tbz2Extractor(QStringList() << "tbz" << "tbz2",cf);
    cf = "tar -C \2 -zxf \1";
    PolyArchiveExtractor tgzExtractor(QStringList() << "tgz",cf);
    cf = "unzip \1 -d \2";
    PolyArchiveExtractor zipExtractor(QStringList() << "zip",cf);
    cf = "bunzip2 -c \1 > \2";
    PolyUncompressor bz2Uncompressor(QStringList() << "bz" << "bz2",cf);
    cf = "gunzip -c \1 > \2";
    PolyUncompressor gzAndZUncompressor(QStringList() << "gz" << "z" << "Z",cf);
    cf = "unzip -c \1 > \2";
    PolyUncompressor zipUncompressor(QStringList() << "zip",cf);

    /*
      Create code parsers for the languages to be parsed,
      and create a tree for C++.
     */
    CppCodeParser cppParser;
    Tree *cppTree = treeForLanguage(cppParser.language());

    QsCodeParser qsParser(cppTree);
    QsaKernelParser qsaKernelParser(cppTree);
    JambiApiParser jambiParser(cppTree);

    /*
      Create code markers for plain text, C++, Java, and qs.
     */
    PlainCodeMarker plainMarker;
    CppCodeMarker cppMarker;
    JavaCodeMarker javaMarker;
    QsCodeMarker qsMarker;

    ApiGenerator apiGenerator;
    HtmlGenerator htmlGenerator;
    JavadocGenerator javadocGenerator;
    LinguistGenerator linguistGenerator;
    LoutGenerator loutGenerator;
    ManGenerator manGenerator;
    SgmlGenerator smglGenerator;
    WebXMLGenerator webxmlGenerator;

    QStringList qdocFiles;
    QString opt;
    int i = 1;

    while (i < argc) {
        opt = argv[i++];

	if (opt == "-help") {
	    printHelp();
	    return EXIT_SUCCESS;
	}
        else if (opt == "-version") {
	    printVersion();
	    return EXIT_SUCCESS;
	}
        else if (opt == "--") {
	    while (i < argc)
		qdocFiles.append(argv[i++]);
        }
        else if (opt.startsWith("-D")) {
            QString define = opt.mid(2);
            defines += define;
        }
        else if (opt == "-slow") {
            slow = true;
	}
        else {
	    qdocFiles.append(opt);
	}
    }

    if (qdocFiles.isEmpty()) {
        printHelp();
        return EXIT_FAILURE;
    }

    /*
      Main loop.
     */
    foreach (QString qf, qdocFiles)
	processQdocconfFile(qf);

    qDeleteAll(trees);
    return EXIT_SUCCESS;
}