#include "utils.h"

#include <QElapsedTimer>

const char Token::Delimiter = '\t';
const char Token::Newline = '\n';
const char Token::JournalEntry = 'J';
const char Token::HeaderEntry = 'H';
const char Token::MarkerIdDelimiter = ':';
const char Token::MarkerValueDelimiter = 'x';
const char Token::MarkerEnd = ';';
const int Token::Precision = 4;

const Timestamp maxTimestamp = std::numeric_limits<Timestamp>::max();

static QTextStream logStream;

/*
 * Utility functions
 */

QDebug operator<<(QDebug dbg, const QCameraViewfinderSettings& p)
{
    dbg.nospace() << toQString(p);
    return dbg.space();
}

void logInitBanner()
{
    static QFile logFile;
    if (!logFile.isOpen()) {
        logFile.setFileName("EyeRecToo.log");
        logFile.open(QIODevice::WriteOnly | QIODevice::Append);
        logStream.setDevice(&logFile);
    }

    QDateTime utc = QDateTime::currentDateTimeUtc();
    qInfo() << "Starting\n######################################################################"
            << "\n# " << QString("EyeRecToo v%1").arg(VERSION)
            << "\n# UTC:      " << utc.toString()
            << "\n# Local:    " << utc.toLocalTime().toString()
            << "\n######################################################################";
}

void logExitBanner()
{
    QDateTime utc = QDateTime::currentDateTimeUtc();
    qInfo() << "Exiting\n######################################################################"
            << "\n# UTC:      " << utc.toString()
            << "\n# Local:    " << utc.toLocalTime().toString()
            << "\n######################################################################\n";

    std::cout.flush();
    logStream.flush();
}

extern ReferenceClock gTimer;
extern LogWidget* gLogWidget;
void logMessages(QtMsgType type, const QMessageLogContext& context, const QString& msg)
{
    static QMutex logMutex;
    static std::vector<QString> logBuffer;

    QMutexLocker mutex(&logMutex);

    std::string str = qFormatLogMessage(type, context, msg).prepend(QString("[%1] ").arg(gTimer.elapsed(), 9, 'f', 0, ' ')).append("\n").toStdString();

    std::cout << str.c_str();
    if (logStream.status() == QTextStream::Ok)
        logStream << str.c_str();

    if (gLogWidget) {
        if (logBuffer.size() > 0) {
            for (auto s = logBuffer.begin(); s != logBuffer.end(); s++)
                QMetaObject::invokeMethod(gLogWidget, "appendMessage", Q_ARG(const QString&, *s));
            logBuffer.clear();
        }
        QMetaObject::invokeMethod(gLogWidget, "appendMessage", Q_ARG(const QString&, QString(str.c_str())));
    } else
        logBuffer.push_back(QString(str.c_str()));

    std::cout.flush();
    logStream.flush();
}

QString toQString(QVideoFrame::PixelFormat format)
{
    switch (format) {
    case QVideoFrame::Format_Jpeg:
        return "JPEG";
    case QVideoFrame::Format_YUYV:
        return "YUYV";
    case QVideoFrame::Format_RGB32:
        return "RGB32";
    case QVideoFrame::Format_RGB24:
        return "RGB24";
    case QVideoFrame::Format_Invalid:
        return "Invalid";
    default:
        return "Unsupported";
    }
}

QString toQString(QCameraViewfinderSettings setting)
{
    return QString::number(setting.resolution().width())
        + " x "
        + QString::number(setting.resolution().height())
        + " "
        + toQString(setting.pixelFormat())
        + " @ "
        + QString::number(static_cast<int>(setting.maximumFrameRate())) + " FPS";
}

QString iniStr(QString str)
{
    return str.remove(QRegExp("[^a-zA-Z\\d\\s]"));
}

// CPU hoggers for testing
void delay(const int& thMs)
{
    QElapsedTimer timer;
    Timestamp cur = timer.elapsed();
    volatile int a = 0;
    while (timer.elapsed() - cur < thMs)
        a++;
}

void loadSoundEffect(const QString& fileName, const QString& exeDir, QSoundEffect& effect)
{
    // TODO: clean this up; QSoundEffect doesn't work with resources currently so
    // we search manually in case this is a release or a development environment.
    // It assumes the build location for the development environment!

    QStringList searchPaths;
    searchPaths << exeDir + "/../EyeRecToo/effects" << exeDir + "/effects";
    bool loaded = false;
    for (int i = 0; i < searchPaths.size(); i++) {
        QString target = searchPaths[i] + "/" + fileName;
        if (QFile(target).exists()) {
            loaded = true;
            effect.setSource(QUrl::fromLocalFile(target));
            break;
        }
    }
    if (!loaded)
        qWarning() << "Failed to load" << fileName;
}