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#include "translator.h"

#include <QtCore/QDebug>

#include <QtCore/QIODevice>

#include <QtCore/QHash>

#include <QtCore/QString>

#include <QtCore/QTextStream>

#include <ctype.h>

#define MAGIC_OBSOLETE_REFERENCE "Obsolete_PO_entries"

// Uncomment if you wish to hard wrap long lines in .po files. Note that this

// affects only msg strings, not comments.

//#define HARD_WRAP_LONG_WORDS

QT_BEGIN_NAMESPACE

static const int MAX_LEN = 79;

static QString poEscapedString(const QString &prefix, const QString &keyword,

                               bool noWrap, const QString &ba)

{

    QStringList lines;

    int off = 0;

    QString res;

    while (off < ba.length()) {

        ushort c = ba[off++].unicode();

        switch (c) {

        case '\n':

            res += QLatin1String("\\n");

            lines.append(res);

            res.clear();

            break;

        case '\r':

            res += QLatin1String("\\r");

            break;

        case '\t':

            res += QLatin1String("\\t");

            break;

        case '\v':

            res += QLatin1String("\\v");

            break;

        case '\a':

            res += QLatin1String("\\a");

            break;

        case '\b':

            res += QLatin1String("\\b");

            break;

        case '\f':

            res += QLatin1String("\\f");

            break;

        case '"':

            res += QLatin1String("\\\"");

            break;

        case '\\':

            res += QLatin1String("\\\\");

            break;

        default:

            if (c < 32) {

                res += QLatin1String("\\x");

                res += QString::number(c, 16);

                if (off < ba.length() && isxdigit(ba[off].unicode()))

                    res += QLatin1String("\"\"");

            } else {

                res += QChar(c);

            }

            break;

        }

    }

    if (!res.isEmpty())

        lines.append(res);

    if (!lines.isEmpty()) {

        if (!noWrap) {

            if (lines.count() != 1 ||

                lines.first().length() > MAX_LEN - keyword.length() - prefix.length() - 3)

            {

                QStringList olines = lines;

                lines = QStringList(QString());

                const int maxlen = MAX_LEN - prefix.length() - 2;

                foreach (const QString &line, olines) {

                    int off = 0;

                    while (off + maxlen < line.length()) {

                        int idx = line.lastIndexOf(QLatin1Char(' '), off + maxlen - 1) + 1;

                        if (idx == off) {

#ifdef HARD_WRAP_LONG_WORDS

                            // This doesn't seem too nice, but who knows ...

                            idx = off + maxlen;

#else

                            idx = line.indexOf(QLatin1Char(' '), off + maxlen) + 1;

                            if (!idx)

                                break;

#endif

                        }

                        lines.append(line.mid(off, idx - off));

                        off = idx;

                    }

                    lines.append(line.mid(off));

                }

            }

        } else if (lines.count() > 1) {

            lines.prepend(QString());

        }

    }

    return prefix + keyword + QLatin1String(" \"") +

           lines.join(QLatin1String("\"\n") + prefix + QLatin1Char('"')) +

           QLatin1String("\"\n");

}

static QString poEscapedLines(const QString &prefix, bool addSpace, const QStringList &lines)

{

    QString out;

    foreach (const QString &line, lines) {

        out += prefix;

        if (addSpace && !line.isEmpty())

            out += QLatin1Char(' ' );

        out += line;

        out += QLatin1Char('\n');

    }

    return out;

}

static QString poEscapedLines(const QString &prefix, bool addSpace, const QString &in0)

{

    QString in = in0;

    if (in.endsWith(QLatin1Char('\n')))

        in.chop(1);

    return poEscapedLines(prefix, addSpace, in.split(QLatin1Char('\n')));

}

static QString poWrappedEscapedLines(const QString &prefix, bool addSpace, const QString &line)

{

    const int maxlen = MAX_LEN - prefix.length();

    QStringList lines;

    int off = 0;

    while (off + maxlen < line.length()) {

        int idx = line.lastIndexOf(QLatin1Char(' '), off + maxlen - 1);

        if (idx < off) {

#if 0 //def HARD_WRAP_LONG_WORDS

            // This cannot work without messing up semantics, so do not even try.

#else

            idx = line.indexOf(QLatin1Char(' '), off + maxlen);

            if (idx < 0)

                break;

#endif

        }

        lines.append(line.mid(off, idx - off));

        off = idx + 1;

    }

    lines.append(line.mid(off));

    return poEscapedLines(prefix, addSpace, lines);

}

struct PoItem

{

public:

    PoItem()

      : isPlural(false), isFuzzy(false)

    {}

public:

    QString id;

    QString context;

    QString tscomment;

    QString oldTscomment;

    QString lineNumber;

    QString fileName;

    QString references;

    QString translatorComments;

    QString automaticComments;

    QString msgId;

    QString oldMsgId;

    QStringList msgStr;

    bool isPlural;

    bool isFuzzy;

    QHash<QString, QString> extra;

};

static bool isTranslationLine(const QString &line)

{

    return line.startsWith(QLatin1String("#~ msgstr"))

           || line.startsWith(QLatin1String("msgstr"));

}

static QString slurpEscapedString(const QStringList &lines, int & l,

        int offset, const QString &prefix, ConversionData &cd)

{

    QString msg;

    int stoff;

    for (; l < lines.size(); ++l) {

        const QString &line = lines.at(l);

        if (line.isEmpty() || !line.startsWith(prefix))

            break;

        while (line[offset].isSpace()) // No length check, as string has no trailing spaces.

            offset++;

        if (line[offset].unicode() != '"')

            break;

        offset++;

        forever {

            if (offset == line.length())

                goto premature_eol;

            ushort c = line[offset++].unicode();

            if (c == '"') {

                if (offset == line.length())

                    break;

                while (line[offset].isSpace())

                    offset++;

                if (line[offset++].unicode() != '"') {

                    cd.appendError(QString::fromLatin1(

                            "PO parsing error: extra characters on line %1.")

                            .arg(l + 1));

                    break;

                }

                continue;

            }

            if (c == '\\') {

                if (offset == line.length())

                    goto premature_eol;

                c = line[offset++].unicode();

                switch (c) {

                case 'r':

                    msg += QLatin1Char('\r'); // Maybe just throw it away?

                    break;

                case 'n':

                    msg += QLatin1Char('\n');

                    break;

                case 't':

                    msg += QLatin1Char('\t');

                    break;

                case 'v':

                    msg += QLatin1Char('\v');

                    break;

                case 'a':

                    msg += QLatin1Char('\a');

                    break;

                case 'b':

                    msg += QLatin1Char('\b');

                    break;

                case 'f':

                    msg += QLatin1Char('\f');

                    break;

                case '"':

                    msg += QLatin1Char('"');

                    break;

                case '\\':

                    msg += QLatin1Char('\\');

                    break;

                case '0':

                case '1':

                case '2':

                case '3':

                case '4':

                case '5':

                case '6':

                case '7':

                    stoff = offset - 1;

                    while ((c = line[offset].unicode()) >= '0' && c <= '7')

                        if (++offset == line.length())

                            goto premature_eol;

                    msg += QChar(line.mid(stoff, offset - stoff).toUInt(0, 8));

                    break;

                case 'x':

                    stoff = offset;

                    while (isxdigit(line[offset].unicode()))

                        if (++offset == line.length())

                            goto premature_eol;

                    msg += QChar(line.mid(stoff, offset - stoff).toUInt(0, 16));

                    break;

                default:

                    cd.appendError(QString::fromLatin1(

                            "PO parsing error: invalid escape '\\%1' (line %2).")

                            .arg(QChar(c)).arg(l + 1));

                    msg += QLatin1Char('\\');

                    msg += QChar(c);

                    break;

                }

            } else {

                msg += QChar(c);

            }

        }

        offset = prefix.size();

    }

    --l;

    return msg;

premature_eol:

    cd.appendError(QString::fromLatin1(

            "PO parsing error: premature end of line %1.").arg(l + 1));

    return QString();

}

static void slurpComment(QString &msg, const QStringList &lines, int & l)

{

    const QChar newline = QLatin1Char('\n');

    QString prefix = lines.at(l);

    for (int i = 1; ; i++) {

        if (prefix.at(i).unicode() != ' ') {

            prefix.truncate(i);

            break;

        }

    }

    for (; l < lines.size(); ++l) {

        const QString &line = lines.at(l);

        if (line.startsWith(prefix))

            msg += line.mid(prefix.size());

        else if (line != QLatin1String("#"))

            break;

        msg += newline;

    }

    --l;

}

bool loadPO(Translator &translator, QIODevice &dev, ConversionData &cd)

{

    const QChar quote = QLatin1Char('"');

    const QChar newline = QLatin1Char('\n');

    QTextStream in(&dev);

    in.setCodec(cd.m_codecForSource.isEmpty() ? QByteArray("UTF-8") : cd.m_codecForSource);

    bool error = false;

    // format of a .po file entry:

    // white-space

    // #  translator-comments

    // #. automatic-comments

    // #: reference...

    // #, flag...

    // #~ msgctxt, msgid*, msgstr - used for obsoleted messages

    // #| msgctxt, msgid* previous untranslated-string - for fuzzy message

    // msgctx string-context

    // msgid untranslated-string

    // -- For singular:

    // msgstr translated-string

    // -- For plural:

    // msgid_plural untranslated-string-plural

    // msgstr[0] translated-string

    // ...

    // we need line based lookahead below.

    QStringList lines;

    while (!in.atEnd())

        lines.append(in.readLine().trimmed());

    lines.append(QString());

    int l = 0;

    PoItem item;

    for (; l != lines.size(); ++l) {

        QString line = lines.at(l);

        if (line.isEmpty())

           continue;

        if (isTranslationLine(line)) {

            bool isObsolete = line.startsWith(QLatin1String("#~ msgstr"));

            const QString prefix = QLatin1String(isObsolete ? "#~ " : "");

            while (true) {

                int idx = line.indexOf(QLatin1Char(' '), prefix.length());

                QString str = slurpEscapedString(lines, l, idx, prefix, cd);

                str.replace(QChar(Translator::TextVariantSeparator),

                            QChar(Translator::BinaryVariantSeparator));

                item.msgStr.append(str);

                if (l + 1 >= lines.size() || !isTranslationLine(lines.at(l + 1)))

                    break;

                ++l;

                line = lines.at(l);

            }

            if (item.msgId.isEmpty()) {

                QRegExp rx(QLatin1String("\\bX-Language: ([^\n]*)\n"));

                int idx = rx.indexIn(item.msgStr.first());

                if (idx >= 0) {

                    translator.setLanguageCode(rx.cap(1));

                    item.msgStr.first().remove(idx, rx.matchedLength());

                }

                QRegExp rx2(QLatin1String("\\bX-Source-Language: ([^\n]*)\n"));

                int idx2 = rx2.indexIn(item.msgStr.first());

                if (idx2 >= 0) {

                    translator.setSourceLanguageCode(rx2.cap(1));

                    item.msgStr.first().remove(idx2, rx2.matchedLength());

                }

                if (item.msgStr.first().indexOf(

                        QRegExp(QLatin1String("\\bX-Virgin-Header:[^\n]*\n"))) >= 0) {

                    item = PoItem();

                    continue;

                }

            }

            // build translator message

            TranslatorMessage msg;

            msg.setContext(item.context);

            if (!item.references.isEmpty()) {

                foreach (const QString &ref,

                         item.references.split(QRegExp(QLatin1String("\\s")),

                                               QString::SkipEmptyParts)) {

                    int pos = ref.lastIndexOf(QLatin1Char(':'));

                    if (pos != -1)

                        msg.addReference(ref.left(pos), ref.mid(pos + 1).toInt());

                }

            } else if (isObsolete) {

                msg.setFileName(QLatin1String(MAGIC_OBSOLETE_REFERENCE));

            }

            msg.setId(item.id);

            msg.setSourceText(item.msgId);

            msg.setOldSourceText(item.oldMsgId);

            msg.setComment(item.tscomment);

            msg.setOldComment(item.oldTscomment);

            msg.setExtraComment(item.automaticComments);

            msg.setTranslatorComment(item.translatorComments);

            msg.setPlural(item.isPlural || item.msgStr.size() > 1);

            msg.setTranslations(item.msgStr);

            if (isObsolete)

                msg.setType(TranslatorMessage::Obsolete);

            else if (item.isFuzzy)

                msg.setType(TranslatorMessage::Unfinished);

            else

                msg.setType(TranslatorMessage::Finished);

            msg.setExtras(item.extra);

            //qDebug() << "WRITE: " << context;

            //qDebug() << "SOURCE: " << msg.sourceText();

            //qDebug() << flags << msg.m_extra;

            translator.append(msg);

            item = PoItem();

        } else if (line.startsWith(QLatin1Char('#'))) {

            switch(line.size() < 2 ? 0 : line.at(1).unicode()) {

                case ':':

                    item.references += line.mid(3);

                    item.references += newline;

                    break;

                case ',': {

                    QStringList flags =

                            line.mid(2).split(QRegExp(QLatin1String("[, ]")),

                                              QString::SkipEmptyParts);

                    if (flags.removeOne(QLatin1String("fuzzy")))

                        item.isFuzzy = true;

                    TranslatorMessage::ExtraData::const_iterator it =

                            item.extra.find(QLatin1String("po-flags"));

                    if (it != item.extra.end())

                        flags.prepend(*it);

                    if (!flags.isEmpty())

                        item.extra[QLatin1String("po-flags")] = flags.join(QLatin1String(", "));

                    break;

                }

                case 0:

                    item.translatorComments += newline;

                    break;

                case ' ':

                    slurpComment(item.translatorComments, lines, l);

                    break;

                case '.':

                    if (line.startsWith(QLatin1String("#. ts-context "))) {

                        item.context = line.mid(14);

                    } else if (line.startsWith(QLatin1String("#. ts-id "))) {

                        item.id = line.mid(9);

                    } else {

                        item.automaticComments += line.mid(3);

                        item.automaticComments += newline;

                    }

                    break;

                case '|':

                    if (line.startsWith(QLatin1String("#| msgid "))) {

                        item.oldMsgId = slurpEscapedString(lines, l, 9, QLatin1String("#| "), cd);

                    } else if (line.startsWith(QLatin1String("#| msgid_plural "))) {

                        QString extra = slurpEscapedString(lines, l, 16, QLatin1String("#| "), cd);

                        if (extra != item.oldMsgId)

                            item.extra[QLatin1String("po-old_msgid_plural")] = extra;

                    } else if (line.startsWith(QLatin1String("#| msgctxt "))) {

                        item.oldTscomment = slurpEscapedString(lines, l, 11, QLatin1String("#| "), cd);

                    } else {

                        cd.appendError(QString(QLatin1String("PO-format parse error in line %1: '%2'\n"))

                            .arg(l + 1).arg(lines[l]));

                        error = true;

                    }

                    break;

                case '~':

                    if (line.startsWith(QLatin1String("#~ msgid "))) {

                        item.msgId = slurpEscapedString(lines, l, 9, QLatin1String("#~ "), cd);

                    } else if (line.startsWith(QLatin1String("#~ msgid_plural "))) {

                        QString extra = slurpEscapedString(lines, l, 16, QLatin1String("#~ "), cd);

                        if (extra != item.msgId)

                            item.extra[QLatin1String("po-msgid_plural")] = extra;

                        item.isPlural = true;

                    } else if (line.startsWith(QLatin1String("#~ msgctxt "))) {

                        item.tscomment = slurpEscapedString(lines, l, 11, QLatin1String("#~ "), cd);

                    } else {

                        cd.appendError(QString(QLatin1String("PO-format parse error in line %1: '%2'\n"))

                            .arg(l + 1).arg(lines[l]));

                        error = true;

                    }