/*
    This source file is part of Konsole, a terminal emulator.

    SPDX-FileCopyrightText: 2007-2008 Robert Knight <robertknight@gmail.com>

    SPDX-License-Identifier: GPL-2.0-or-later

    This program 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 for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301  USA.
*/

// Own
#include "KeyboardTranslator.h"

// System
#include <cctype>
#include <cstdio>

// Qt
#include <QBuffer>
#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QKeySequence>
#include <QRegExp>
#include <QTextStream>
#include <QtDebug>

#include "tools.h"

// KDE
// #include <KDebug>
// #include <KLocale>
// #include <KStandardDirs>

using namespace Konsole;

const QByteArray KeyboardTranslatorManager::defaultTranslatorText(
    "keyboard \"Fallback Key Translator\"\n"
    "key Tab : \"\\t\"");

#ifdef Q_OS_MAC
// On Mac, Qt::ControlModifier means Cmd, and MetaModifier means Ctrl
const Qt::KeyboardModifier KeyboardTranslator::CTRL_MOD = Qt::MetaModifier;
#else
const Qt::KeyboardModifier KeyboardTranslator::CTRL_MOD = Qt::ControlModifier;
#endif

KeyboardTranslatorManager::KeyboardTranslatorManager()
    : _haveLoadedAll(false)
{
}

KeyboardTranslatorManager::~KeyboardTranslatorManager()
{
    qDeleteAll(_translators);
}

QString KeyboardTranslatorManager::findTranslatorPath(const QString &name)
{
    return QString(kbLayoutDir() + name + QLatin1String(".keytab"));
    // return KGlobal::dirs()->findResource("data","konsole/"+name+".keytab");
}

void KeyboardTranslatorManager::findTranslators()
{
    QDir dir(kbLayoutDir());
    QStringList filters;
    filters << QLatin1String("*.keytab");
    dir.setNameFilters(filters);
    QStringList list = dir.entryList(filters);
    //    QStringList list = KGlobal::dirs()->findAllResources("data",
    //                                                         "konsole/*.keytab",
    //                                                        KStandardDirs::NoDuplicates);

    // add the name of each translator to the list and associated
    // the name with a null pointer to indicate that the translator
    // has not yet been loaded from disk
    QStringListIterator listIter(list);
    while (listIter.hasNext()) {
        QString translatorPath = listIter.next();

        QString name = QFileInfo(translatorPath).baseName();

        if (!_translators.contains(name))
            _translators.insert(name, nullptr);
    }

    _haveLoadedAll = true;
}

const KeyboardTranslator *KeyboardTranslatorManager::findTranslator(const QString &name)
{
    if (name.isEmpty())
        return defaultTranslator();

    if (_translators.contains(name) && _translators[name] != nullptr)
        return _translators[name];

    KeyboardTranslator *translator = loadTranslator(name);

    if (translator != nullptr)
        _translators[name] = translator;
    else if (!name.isEmpty())
        qDebug() << "Unable to load translator" << name;

    return translator;
}

bool KeyboardTranslatorManager::saveTranslator(const KeyboardTranslator *translator)
{
    qDebug() << "KeyboardTranslatorManager::saveTranslator"
             << "unimplemented";
    Q_UNUSED(translator);
#if 0
    const QString path = KGlobal::dirs()->saveLocation("data","konsole/")+translator->name()
           +".keytab";

    //kDebug() << "Saving translator to" << path;

    QFile destination(path);
    if (!destination.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        qDebug() << "Unable to save keyboard translation:"
                   << destination.errorString();
        return false;
    }

    {
        KeyboardTranslatorWriter writer(&destination);
        writer.writeHeader(translator->description());

        QListIterator<KeyboardTranslator::Entry> iter(translator->entries());
        while ( iter.hasNext() )
            writer.writeEntry(iter.next());
    }

    destination.close();
#endif
    return true;
}

KeyboardTranslator *KeyboardTranslatorManager::loadTranslator(const QString &name)
{
    const QString &path = findTranslatorPath(name);

    QFile source(path);
    if (name.isEmpty() || !source.open(QIODevice::ReadOnly | QIODevice::Text))
        return nullptr;

    return loadTranslator(&source, name);
}

const KeyboardTranslator *KeyboardTranslatorManager::defaultTranslator()
{
    // Try to find the default.keytab file if it exists, otherwise
    // fall back to the hard-coded one
    const KeyboardTranslator *translator = findTranslator(QLatin1String("default"));
    if (!translator) {
        QBuffer textBuffer;
        textBuffer.setData(defaultTranslatorText);
        textBuffer.open(QIODevice::ReadOnly);
        translator = loadTranslator(&textBuffer, QLatin1String("fallback"));
    }
    return translator;
}

KeyboardTranslator *KeyboardTranslatorManager::loadTranslator(QIODevice *source, const QString &name)
{
    KeyboardTranslator *translator = new KeyboardTranslator(name);
    KeyboardTranslatorReader reader(source);
    translator->setDescription(reader.description());
    while (reader.hasNextEntry())
        translator->addEntry(reader.nextEntry());

    source->close();

    if (!reader.parseError()) {
        return translator;
    } else {
        delete translator;
        return nullptr;
    }
}

KeyboardTranslatorWriter::KeyboardTranslatorWriter(QIODevice *destination)
    : _destination(destination)
{
    Q_ASSERT(destination && destination->isWritable());

    _writer = new QTextStream(_destination);
}
KeyboardTranslatorWriter::~KeyboardTranslatorWriter()
{
    delete _writer;
}
void KeyboardTranslatorWriter::writeHeader(const QString &description)
{
    *_writer << "keyboard \"" << description << '\"' << '\n';
}
void KeyboardTranslatorWriter::writeEntry(const KeyboardTranslator::Entry &entry)
{
    QString result;
    if (entry.command() != KeyboardTranslator::NoCommand)
        result = entry.resultToString();
    else
        result = QLatin1Char('\"') + entry.resultToString() + QLatin1Char('\"');

    *_writer << QLatin1String("key ") << entry.conditionToString() << QLatin1String(" : ") << result << QLatin1Char('\n');
}

// each line of the keyboard translation file is one of:
//
// - keyboard "name"
// - key KeySequence : "characters"
// - key KeySequence : CommandName
//
// KeySequence begins with the name of the key ( taken from the Qt::Key enum )
// and is followed by the keyboard modifiers and state flags ( with + or - in front
// of each modifier or flag to indicate whether it is required ).  All keyboard modifiers
// and flags are optional, if a particular modifier or state is not specified it is
// assumed not to be a part of the sequence.  The key sequence may contain whitespace
//
// eg:  "key Up+Shift : scrollLineUp"
//      "key Next-Shift : "\E[6~"
//
// (lines containing only whitespace are ignored, parseLine assumes that comments have
// already been removed)
//

KeyboardTranslatorReader::KeyboardTranslatorReader(QIODevice *source)
    : _source(source)
    , _hasNext(false)
{
    // read input until we find the description
    while (_description.isEmpty() && !source->atEnd()) {
        QList<Token> tokens = tokenize(QString::fromUtf8(source->readLine()));
        if (!tokens.isEmpty() && tokens.first().type == Token::TitleKeyword)
            _description = tokens[1].text;
    }
    // read first entry (if any)
    readNext();
}
void KeyboardTranslatorReader::readNext()
{
    // find next entry
    while (!_source->atEnd()) {
        const QList<Token> &tokens = tokenize(QString::fromUtf8(_source->readLine()));
        if (!tokens.isEmpty() && tokens.first().type == Token::KeyKeyword) {
            KeyboardTranslator::States flags = KeyboardTranslator::NoState;
            KeyboardTranslator::States flagMask = KeyboardTranslator::NoState;
            Qt::KeyboardModifiers modifiers = Qt::NoModifier;
            Qt::KeyboardModifiers modifierMask = Qt::NoModifier;

            int keyCode = Qt::Key_unknown;

            decodeSequence(tokens[1].text.toLower(), keyCode, modifiers, modifierMask, flags, flagMask);

            KeyboardTranslator::Command command = KeyboardTranslator::NoCommand;
            QByteArray text;

            // get text or command
            if (tokens[2].type == Token::OutputText) {
                text = tokens[2].text.toLocal8Bit();
            } else if (tokens[2].type == Token::Command) {
                // identify command
                if (!parseAsCommand(tokens[2].text, command))
                    qDebug() << "Command" << tokens[2].text << "not understood.";
            }

            KeyboardTranslator::Entry newEntry;
            newEntry.setKeyCode(keyCode);
            newEntry.setState(flags);
            newEntry.setStateMask(flagMask);
            newEntry.setModifiers(modifiers);
            newEntry.setModifierMask(modifierMask);
            newEntry.setText(text);
            newEntry.setCommand(command);

            _nextEntry = newEntry;

            _hasNext = true;

            return;
        }
    }

    _hasNext = false;
}

bool KeyboardTranslatorReader::parseAsCommand(const QString &text, KeyboardTranslator::Command &command)
{
    if (text.compare(QLatin1String("erase"), Qt::CaseInsensitive) == 0)
        command = KeyboardTranslator::EraseCommand;
    else if (text.compare(QLatin1String("scrollpageup"), Qt::CaseInsensitive) == 0)
        command = KeyboardTranslator::ScrollPageUpCommand;
    else if (text.compare(QLatin1String("scrollpagedown"), Qt::CaseInsensitive) == 0)
        command = KeyboardTranslator::ScrollPageDownCommand;
    else if (text.compare(QLatin1String("scrolllineup"), Qt::CaseInsensitive) == 0)
        command = KeyboardTranslator::ScrollLineUpCommand;
    else if (text.compare(QLatin1String("scrolllinedown"), Qt::CaseInsensitive) == 0)
        command = KeyboardTranslator::ScrollLineDownCommand;
    else if (text.compare(QLatin1String("scrolllock"), Qt::CaseInsensitive) == 0)
        command = KeyboardTranslator::ScrollLockCommand;
    else if (text.compare(QLatin1String("scrolluptotop"), Qt::CaseInsensitive) == 0)
        command = KeyboardTranslator::ScrollUpToTopCommand;
    else if (text.compare(QLatin1String("scrolldowntobottom"), Qt::CaseInsensitive) == 0)
        command = KeyboardTranslator::ScrollDownToBottomCommand;
    else
        return false;

    return true;
}

bool KeyboardTranslatorReader::decodeSequence(const QString &text,
                                              int &keyCode,
                                              Qt::KeyboardModifiers &modifiers,
                                              Qt::KeyboardModifiers &modifierMask,
                                              KeyboardTranslator::States &flags,
                                              KeyboardTranslator::States &flagMask)
{
    bool isWanted = true;
    bool endOfItem = false;
    QString buffer;

    Qt::KeyboardModifiers tempModifiers = modifiers;
    Qt::KeyboardModifiers tempModifierMask = modifierMask;
    KeyboardTranslator::States tempFlags = flags;
    KeyboardTranslator::States tempFlagMask = flagMask;

    for (int i = 0; i < text.size(); i++) {
        const QChar &ch = text[i];
        bool isFirstLetter = i == 0;
        bool isLastLetter = (i == text.size() - 1);
        endOfItem = true;
        if (ch.isLetterOrNumber()) {
            endOfItem = false;
            buffer.append(ch);
        } else if (isFirstLetter) {
            buffer.append(ch);
        }

        if ((endOfItem || isLastLetter) && !buffer.isEmpty()) {
            Qt::KeyboardModifier itemModifier = Qt::NoModifier;
            int itemKeyCode = 0;
            KeyboardTranslator::State itemFlag = KeyboardTranslator::NoState;

            if (parseAsModifier(buffer, itemModifier)) {
                tempModifierMask |= itemModifier;

                if (isWanted)
                    tempModifiers |= itemModifier;
            } else if (parseAsStateFlag(buffer, itemFlag)) {
                tempFlagMask |= itemFlag;

                if (isWanted)
                    tempFlags |= itemFlag;
            } else if (parseAsKeyCode(buffer, itemKeyCode))
                keyCode = itemKeyCode;
            else
                qDebug() << "Unable to parse key binding item:" << buffer;

            buffer.clear();
        }

        // check if this is a wanted / not-wanted flag and update the
        // state ready for the next item
        if (ch == QLatin1Char('+'))
            isWanted = true;
        else if (ch == QLatin1Char('-'))
            isWanted = false;
    }

    modifiers = tempModifiers;
    modifierMask = tempModifierMask;
    flags = tempFlags;
    flagMask = tempFlagMask;

    return true;
}

bool KeyboardTranslatorReader::parseAsModifier(const QString &item, Qt::KeyboardModifier &modifier)
{
    if (item == QLatin1String("shift"))
        modifier = Qt::ShiftModifier;
    else if (item == QLatin1String("ctrl") || item == QLatin1String("control"))
        modifier = Qt::ControlModifier;
    else if (item == QLatin1String("alt"))
        modifier = Qt::AltModifier;
    else if (item == QLatin1String("meta"))
        modifier = Qt::MetaModifier;
    else if (item == QLatin1String("keypad"))
        modifier = Qt::KeypadModifier;
    else
        return false;

    return true;
}
bool KeyboardTranslatorReader::parseAsStateFlag(const QString &item, KeyboardTranslator::State &flag)
{
    if (item == QLatin1String("appcukeys") || item == QLatin1String("appcursorkeys"))
        flag = KeyboardTranslator::CursorKeysState;
    else if (item == QLatin1String("ansi"))
        flag = KeyboardTranslator::AnsiState;
    else if (item == QLatin1String("newline"))
        flag = KeyboardTranslator::NewLineState;
    else if (item == QLatin1String("appscreen"))
        flag = KeyboardTranslator::AlternateScreenState;
    else if (item == QLatin1String("anymod") || item == QLatin1String("anymodifier"))
        flag = KeyboardTranslator::AnyModifierState;
    else if (item == QLatin1String("appkeypad"))
        flag = KeyboardTranslator::ApplicationKeypadState;
    else
        return false;

    return true;
}
bool KeyboardTranslatorReader::parseAsKeyCode(const QString &item, int &keyCode)
{
    QKeySequence sequence = QKeySequence::fromString(item);
    if (!sequence.isEmpty()) {
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
        keyCode = sequence[0];
#else
        keyCode = sequence[0].toCombined();
#endif

        if (sequence.count() > 1) {
            qDebug() << "Unhandled key codes in sequence: " << item;
        }
    }
    // additional cases implemented for backwards compatibility with KDE 3
    else if (item == QLatin1String("prior"))
        keyCode = Qt::Key_PageUp;
    else if (item == QLatin1String("next"))
        keyCode = Qt::Key_PageDown;
    else
        return false;

    return true;
}

QString KeyboardTranslatorReader::description() const
{
    return _description;
}
bool KeyboardTranslatorReader::hasNextEntry() const
{
    return _hasNext;
}
KeyboardTranslator::Entry KeyboardTranslatorReader::createEntry(const QString &condition, const QString &result)
{
    QString entryString = QString::fromLatin1("keyboard \"temporary\"\nkey ");
    entryString.append(condition);
    entryString.append(QLatin1String(" : "));

    // if 'result' is the name of a command then the entry result will be that command,
    // otherwise the result will be treated as a string to echo when the key sequence
    // specified by 'condition' is pressed
    KeyboardTranslator::Command command;
    if (parseAsCommand(result, command))
        entryString.append(result);
    else
        entryString.append(QLatin1Char('\"') + result + QLatin1Char('\"'));

    QByteArray array = entryString.toUtf8();
    QBuffer buffer(&array);
    buffer.open(QIODevice::ReadOnly);
    KeyboardTranslatorReader reader(&buffer);

    KeyboardTranslator::Entry entry;
    if (reader.hasNextEntry())
        entry = reader.nextEntry();

    return entry;
}

KeyboardTranslator::Entry KeyboardTranslatorReader::nextEntry()
{
    Q_ASSERT(_hasNext);
    KeyboardTranslator::Entry entry = _nextEntry;
    readNext();
    return entry;
}
bool KeyboardTranslatorReader::parseError()
{
    return false;
}
QList<KeyboardTranslatorReader::Token> KeyboardTranslatorReader::tokenize(const QString &line)
{
    QString text = line;

    // remove comments
    bool inQuotes = false;
    int commentPos = -1;
    for (int i = text.length() - 1; i >= 0; i--) {
        QChar ch = text[i];
        if (ch == QLatin1Char('\"'))
            inQuotes = !inQuotes;
        else if (ch == QLatin1Char('#') && !inQuotes)
            commentPos = i;
    }
    if (commentPos != -1)
        text.remove(commentPos, text.length());

    text = text.simplified();

    // title line: keyboard "title"
    static QRegExp title(QLatin1String("keyboard\\s+\"(.*)\""));
    // key line: key KeySequence : "output"
    // key line: key KeySequence : command
    static QRegExp key(QLatin1String("key\\s+([\\w\\+\\s\\-\\*\\.]+)\\s*:\\s*(\"(.*)\"|\\w+)"));

    QList<Token> list;
    if (text.isEmpty()) {
        return list;
    }

    if (title.exactMatch(text)) {
        Token titleToken = {Token::TitleKeyword, QString()};
        Token textToken = {Token::TitleText, title.capturedTexts().at(1)};

        list << titleToken << textToken;
    } else if (key.exactMatch(text)) {
        Token keyToken = {Token::KeyKeyword, QString()};
        Token sequenceToken = {Token::KeySequence, key.capturedTexts().value(1).remove(QLatin1Char(' '))};

        list << keyToken << sequenceToken;

        if (key.capturedTexts().at(3).isEmpty()) {
            // capturedTexts()[2] is a command
            Token commandToken = {Token::Command, key.capturedTexts().at(2)};
            list << commandToken;
        } else {
            // capturedTexts()[3] is the output string
            Token outputToken = {Token::OutputText, key.capturedTexts().at(3)};
            list << outputToken;
        }
    } else {
        qDebug() << "Line in keyboard translator file could not be understood:" << text;
    }

    return list;
}

QList<QString> KeyboardTranslatorManager::allTranslators()
{
    if (!_haveLoadedAll) {
        findTranslators();
    }

    return _translators.keys();
}

KeyboardTranslator::Entry::Entry()
    : _keyCode(0)
    , _modifiers(Qt::NoModifier)
    , _modifierMask(Qt::NoModifier)
    , _state(NoState)
    , _stateMask(NoState)
    , _command(NoCommand)
{
}

bool KeyboardTranslator::Entry::operator==(const Entry &rhs) const
{
    return _keyCode == rhs._keyCode && _modifiers == rhs._modifiers && _modifierMask == rhs._modifierMask && _state == rhs._state
        && _stateMask == rhs._stateMask && _command == rhs._command && _text == rhs._text;
}

bool KeyboardTranslator::Entry::matches(int keyCode, Qt::KeyboardModifiers modifiers, States testState) const
{
#ifdef Q_OS_MAC
    // On Mac, arrow keys are considered part of keypad. Ignore that.
    modifiers &= ~Qt::KeypadModifier;
#endif

    if (_keyCode != keyCode)
        return false;

    if ((modifiers & _modifierMask) != (_modifiers & _modifierMask))
        return false;

    // if modifiers is non-zero, the 'any modifier' state is implicit
    if ((modifiers & ~Qt::KeypadModifier) != 0)
        testState |= AnyModifierState;

    if ((testState & _stateMask) != (_state & _stateMask))
        return false;

    // special handling for the 'Any Modifier' state, which checks for the presence of
    // any or no modifiers.  In this context, the 'keypad' modifier does not count.
    bool anyModifiersSet = modifiers != 0 && modifiers != Qt::KeypadModifier;
    bool wantAnyModifier = _state & KeyboardTranslator::AnyModifierState;
    if (_stateMask & KeyboardTranslator::AnyModifierState) {
        if (wantAnyModifier != anyModifiersSet)
            return false;
    }

    return true;
}
QByteArray KeyboardTranslator::Entry::escapedText(bool expandWildCards, Qt::KeyboardModifiers modifiers) const
{
    QByteArray result(text(expandWildCards, modifiers));

    for (int i = 0; i < result.size(); i++) {
        char ch = result[i];
        char replacement = 0;

        switch (ch) {
        case 27:
            replacement = 'E';
            break;
        case 8:
            replacement = 'b';
            break;
        case 12:
            replacement = 'f';
            break;
        case 9:
            replacement = 't';
            break;
        case 13:
            replacement = 'r';
            break;
        case 10:
            replacement = 'n';
            break;
        default:
            // any character which is not printable is replaced by an equivalent
            // \xhh escape sequence (where 'hh' are the corresponding hex digits)
            if (!QChar(QLatin1Char(ch)).isPrint())
                replacement = 'x';
        }

        if (replacement == 'x') {
            result.replace(i, 1, QByteArray("\\x" + QByteArray(1, ch).toHex()));
        } else if (replacement != 0) {
            result.remove(i, 1);
            result.insert(i, '\\');
            result.insert(i + 1, replacement);
        }
    }

    return result;
}
QByteArray KeyboardTranslator::Entry::unescape(const QByteArray &input) const
{
    QByteArray result(input);

    for (int i = 0; i < result.size() - 1; i++) {
        auto ch = result[i];
        if (ch == '\\') {
            char replacement[2] = {0, 0};
            int charsToRemove = 2;
            bool escapedChar = true;

            switch (result[i + 1]) {
            case 'E':
                replacement[0] = 27;
                break;
            case 'b':
                replacement[0] = 8;
                break;
            case 'f':
                replacement[0] = 12;
                break;
            case 't':
                replacement[0] = 9;
                break;
            case 'r':
                replacement[0] = 13;
                break;
            case 'n':
                replacement[0] = 10;
                break;
            case 'x': {
                // format is \xh or \xhh where 'h' is a hexadecimal
                // digit from 0-9 or A-F which should be replaced
                // with the corresponding character value
                char hexDigits[3] = {0};

                if ((i < result.size() - 2) && isxdigit(result[i + 2]))
                    hexDigits[0] = result[i + 2];
                if ((i < result.size() - 3) && isxdigit(result[i + 3]))
                    hexDigits[1] = result[i + 3];

                unsigned charValue = 0;
                sscanf(hexDigits, "%x", &charValue);

                replacement[0] = (char)charValue;
                charsToRemove = 2 + strlen(hexDigits);
            } break;
            default:
                escapedChar = false;
            }

            if (escapedChar)
                result.replace(i, charsToRemove, replacement, 1);
        }
    }

    return result;
}

void KeyboardTranslator::Entry::insertModifier(QString &item, int modifier) const
{
    if (!(modifier & _modifierMask))
        return;

    if (modifier & _modifiers)
        item += QLatin1Char('+');
    else
        item += QLatin1Char('-');

    if (modifier == Qt::ShiftModifier)
        item += QLatin1String("Shift");
    else if (modifier == Qt::ControlModifier)
        item += QLatin1String("Ctrl");
    else if (modifier == Qt::AltModifier)
        item += QLatin1String("Alt");
    else if (modifier == Qt::MetaModifier)
        item += QLatin1String("Meta");
    else if (modifier == Qt::KeypadModifier)
        item += QLatin1String("KeyPad");
}
void KeyboardTranslator::Entry::insertState(QString &item, int state) const
{
    if (!(state & _stateMask))
        return;

    if (state & _state)
        item += QLatin1Char('+');
    else
        item += QLatin1Char('-');

    if (state == KeyboardTranslator::AlternateScreenState)
        item += QLatin1String("AppScreen");
    else if (state == KeyboardTranslator::NewLineState)
        item += QLatin1String("NewLine");
    else if (state == KeyboardTranslator::AnsiState)
        item += QLatin1String("Ansi");
    else if (state == KeyboardTranslator::CursorKeysState)
        item += QLatin1String("AppCursorKeys");
    else if (state == KeyboardTranslator::AnyModifierState)
        item += QLatin1String("AnyModifier");
    else if (state == KeyboardTranslator::ApplicationKeypadState)
        item += QLatin1String("AppKeypad");
}
QString KeyboardTranslator::Entry::resultToString(bool expandWildCards, Qt::KeyboardModifiers modifiers) const
{
    if (!_text.isEmpty())
        return QString::fromLatin1(escapedText(expandWildCards, modifiers));
    else if (_command == EraseCommand)
        return QLatin1String("Erase");
    else if (_command == ScrollPageUpCommand)
        return QLatin1String("ScrollPageUp");
    else if (_command == ScrollPageDownCommand)
        return QLatin1String("ScrollPageDown");
    else if (_command == ScrollLineUpCommand)
        return QLatin1String("ScrollLineUp");
    else if (_command == ScrollLineDownCommand)
        return QLatin1String("ScrollLineDown");
    else if (_command == ScrollLockCommand)
        return QLatin1String("ScrollLock");
    else if (_command == ScrollUpToTopCommand)
        return QLatin1String("ScrollUpToTop");
    else if (_command == ScrollDownToBottomCommand)
        return QLatin1String("ScrollDownToBottom");

    return QString();
}
QString KeyboardTranslator::Entry::conditionToString() const
{
    QString result = QKeySequence(_keyCode).toString();

    insertModifier(result, Qt::ShiftModifier);
    insertModifier(result, Qt::ControlModifier);
    insertModifier(result, Qt::AltModifier);
    insertModifier(result, Qt::MetaModifier);
    insertModifier(result, Qt::KeypadModifier);

    insertState(result, KeyboardTranslator::AlternateScreenState);
    insertState(result, KeyboardTranslator::NewLineState);
    insertState(result, KeyboardTranslator::AnsiState);
    insertState(result, KeyboardTranslator::CursorKeysState);
    insertState(result, KeyboardTranslator::AnyModifierState);
    insertState(result, KeyboardTranslator::ApplicationKeypadState);

    return result;
}

KeyboardTranslator::KeyboardTranslator(const QString &name)
    : _name(name)
{
}

void KeyboardTranslator::setDescription(const QString &description)
{
    _description = description;
}
QString KeyboardTranslator::description() const
{
    return _description;
}
void KeyboardTranslator::setName(const QString &name)
{
    _name = name;
}
QString KeyboardTranslator::name() const
{
    return _name;
}

QList<KeyboardTranslator::Entry> KeyboardTranslator::entries() const
{
    return _entries.values();
}

void KeyboardTranslator::addEntry(const Entry &entry)
{
    const int keyCode = entry.keyCode();
    _entries.insert(keyCode, entry);
}
void KeyboardTranslator::replaceEntry(const Entry &existing, const Entry &replacement)
{
    if (!existing.isNull())
        _entries.remove(existing.keyCode(), existing);
    _entries.insert(replacement.keyCode(), replacement);
}
void KeyboardTranslator::removeEntry(const Entry &entry)
{
    _entries.remove(entry.keyCode(), entry);
}
KeyboardTranslator::Entry KeyboardTranslator::findEntry(int keyCode, Qt::KeyboardModifiers modifiers, States state) const
{
    for (auto it = _entries.cbegin(), end = _entries.cend(); it != end; ++it) {
        if (it.key() == keyCode)
            if (it.value().matches(keyCode, modifiers, state))
                return *it;
    }
    return Entry(); // entry not found
}
void KeyboardTranslatorManager::addTranslator(KeyboardTranslator *translator)
{
    _translators.insert(translator->name(), translator);

    if (!saveTranslator(translator))
        qDebug() << "Unable to save translator" << translator->name() << "to disk.";
}
bool KeyboardTranslatorManager::deleteTranslator(const QString &name)
{
    Q_ASSERT(_translators.contains(name));

    // locate and delete
    QString path = findTranslatorPath(name);
    if (QFile::remove(path)) {
        _translators.remove(name);
        return true;
    } else {
        qDebug() << "Failed to remove translator - " << path;
        return false;
    }
}
Q_GLOBAL_STATIC(KeyboardTranslatorManager, theKeyboardTranslatorManager)
KeyboardTranslatorManager *KeyboardTranslatorManager::instance()
{
    return theKeyboardTranslatorManager;
}