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** This file is part of the Qt Linguist of the Qt Toolkit.
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****************************************************************************/

#include "translator.h"

#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>
#include <QtCore/QString>
#include <QtCore/QStringList>

static int usage(const QStringList &args)
{
    Q_UNUSED(args);

    QString loaders;
    QString savers;
    QString line = QString(QLatin1String("    %1 - %2\n"));
    foreach (Translator::FileFormat format, Translator::registeredFileFormats()) {
        loaders += line.arg(format.extension, -5).arg(format.description);
        if (format.fileType != Translator::FileFormat::SourceCode)
            savers += line.arg(format.extension, -5).arg(format.description);
    }

    qWarning("%s", qPrintable(QString(QLatin1String("\nUsage:\n"
        "    lconvert [options] <infile> [<infile>...]\n\n"
        "lconvert is part of Qt's Linguist tool chain. It can be used as a\n"
        "stand-alone tool to convert translation data files from one of the\n"
        "following input formats\n\n%1\n"
        "to one of the following output formats\n\n%2\n"
        "If multiple input files are specified the translations are merged with\n"
        "translations from later files taking precedence.\n\n"
        "Options:\n"
        "    -h\n"
        "    --help  Display this information and exit.\n\n"
        "    -i <infile>\n"
        "    --input-file <infile>\n"
        "           Specify input file. Use if <infile> might start with a dash.\n"
        "           This option can be used several times to merge inputs.\n"
        "           May be '-' (standard input) for use in a pipe.\n\n"
        "    -o <outfile>\n"
        "    --output-file <outfile>\n"
        "           Specify output file. Default is '-' (standard output).\n\n"
        "    -if <informat>\n"
        "    --input-format <format>\n"
        "           Specify input format for subsequent <infile>s.\n"
        "           The format is auto-detected from the file name and defaults to 'ts'.\n\n"
        "    -of <outformat>\n"
        "    --output-format <outformat>\n"
        "           Specify output format. See -if.\n\n"
        "    --input-codec <codec>\n"
        "           Specify encoding for .qm and .po input files. Default is 'Latin1'\n"
        "           for .qm and 'UTF-8' for .po files. UTF-8 is always tried as well for\n"
        "           .qm, corresponding to the possible use of the trUtf8() function.\n\n"
        "    --output-codec <codec>\n"
        "           Specify encoding for .po output files. Default is 'UTF-8'.\n\n"
        "    --drop-tags <regexp>\n"
        "           Drop named extra tags when writing 'ts' or 'xlf' files.\n"
        "           May be specified repeatedly.\n\n"
        "    --drop-translations\n"
        "           Drop existing translations and reset the status to 'unfinished'.\n"
        "           Note: this implies --no-obsolete.\n\n"
        "    --source-language <language>[_<region>]\n"
        "           Specify/override the language of the source strings. Defaults to\n"
        "           POSIX if not specified and the file does not name it yet.\n"
        "    --target-language <language>[_<region>]\n"
        "           Specify/override the language of the translation.\n"
        "           The target language is guessed from the file name if this option\n"
        "           is not specified and the file contents name no language yet.\n\n"
        "    --no-obsolete\n"
        "           Drop obsolete messages.\n\n"
        "    --no-finished\n"
        "           Drop finished messages.\n\n"
        "    --verbose\n"
        "           be a bit more verbose\n\n"
        "Long options can be specified with only one leading dash, too.\n\n"
        "Return value:\n"
        "    0 on success\n"
        "    1 on command line parse failures\n"
        "    2 on read failures\n"
        "    3 on write failures\n")).arg(loaders).arg(savers)));
    return 1;
}

struct File
{
    QString name;
    QString format;
};

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    QStringList args = app.arguments();

    QList<File> inFiles;
    QString inFormat(QLatin1String("auto"));
    QString outFileName;
    QString outFormat(QLatin1String("auto"));
    QString targetLanguage;
    QString sourceLanguage;
    bool dropTranslations = false;
    bool noObsolete = false;
    bool noFinished = false;
    bool verbose = false;

    ConversionData cd;
    Translator tr;

    for (int i = 1; i < args.size(); ++i) {
        if (args[i].startsWith(QLatin1String("--")))
            args[i].remove(0, 1);
        if (args[i] == QLatin1String("-o")
         || args[i] == QLatin1String("-output-file")) {
            if (++i >= args.size())
                return usage(args);
            outFileName = args[i];
        } else if (args[i] == QLatin1String("-of")
                || args[i] == QLatin1String("-output-format")) {
            if (++i >= args.size())
                return usage(args);
            outFormat = args[i];
        } else if (args[i] == QLatin1String("-i")
                || args[i] == QLatin1String("-input-file")) {
            if (++i >= args.size())
                return usage(args);
            File file;
            file.name = args[i];
            file.format = inFormat;
            inFiles.append(file);
        } else if (args[i] == QLatin1String("-if")
                || args[i] == QLatin1String("-input-format")) {
            if (++i >= args.size())
                return usage(args);
            inFormat = args[i];
        } else if (args[i] == QLatin1String("-input-codec")) {
            if (++i >= args.size())
                return usage(args);
            cd.m_codecForSource = args[i].toLatin1();
        } else if (args[i] == QLatin1String("-output-codec")) {
            if (++i >= args.size())
                return usage(args);
            cd.m_outputCodec = args[i].toLatin1();
        } else if (args[i] == QLatin1String("-drop-tag")) {
            if (++i >= args.size())
                return usage(args);
            cd.m_dropTags.append(args[i]);
        } else if (args[i] == QLatin1String("-drop-translations")) {
            dropTranslations = true;
        } else if (args[i] == QLatin1String("-target-language")) {
            if (++i >= args.size())
                return usage(args);
            targetLanguage = args[i];
        } else if (args[i] == QLatin1String("-source-language")) {
            if (++i >= args.size())
                return usage(args);
            sourceLanguage = args[i];
        } else if (args[i].startsWith(QLatin1String("-h"))) {
            usage(args);
            return 0;
        } else if (args[i] == QLatin1String("-no-obsolete")) {
            noObsolete = true;
        } else if (args[i] == QLatin1String("-no-finished")) {
            noFinished = true;
        } else if (args[i] == QLatin1String("-verbose")) {
            verbose = true;
        } else if (args[i].startsWith(QLatin1Char('-'))) {
            return usage(args);
        } else {
            File file;
            file.name = args[i];
            file.format = inFormat;
            inFiles.append(file);
        }
    }

    if (inFiles.isEmpty())
        return usage(args);

    tr.setLanguageCode(Translator::guessLanguageCodeFromFileName(inFiles[0].name));
    if (!targetLanguage.isEmpty())
        tr.setLanguageCode(targetLanguage);
    if (!sourceLanguage.isEmpty())
        tr.setSourceLanguageCode(sourceLanguage);

    if (!tr.load(inFiles[0].name, cd, inFiles[0].format)) {
        qWarning() << qPrintable(cd.error());
        return 2;
    }
    Translator::reportDuplicates(tr.resolveDuplicates(), inFiles[0].name, verbose);

    for (int i = 1; i < inFiles.size(); ++i) {
        Translator tr2;
        if (!tr2.load(inFiles[i].name, cd, inFiles[i].format)) {
            qWarning() << qPrintable(cd.error());
            return 2;
        }
        Translator::reportDuplicates(tr2.resolveDuplicates(), inFiles[i].name, verbose);
        for (int j = 0; j < tr2.messageCount(); ++j)
            tr.replaceSorted(tr2.message(j));
    }

    if (noObsolete)
        tr.stripObsoleteMessages();
    if (noFinished)
        tr.stripFinishedMessages();
    if (dropTranslations)
        tr.dropTranslations();

    tr.normalizeTranslations(cd);
    if (!cd.errors().isEmpty()) {
        qWarning("%s", qPrintable(cd.error()));
        cd.clearErrors();
    }
    if (!tr.save(outFileName, cd, outFormat)) {
        qWarning("%s", qPrintable(cd.error()));
        return 3;
    }
    return 0;
}