#include "logger.h"
#include "settings.h"
#include <QFileInfo>
#include <sys/stat.h>

QString Logging::fileName = "../logs/EventConfigurator.log";
qint64  Logging::maxFileSize = 1024 *1024 * 10;
int     Logging::maxBackupFiles = 5;
bool    Logging::outputToConsole = false;
bool    Logging::outputToFile = true;
QString Logging::messagePattern = "[%{time yyyyMMdd h:mm:ss.zzz ttt} %{if-debug}D%{endif}%{if-info}I%{endif}%{if-warning}W%{endif}%{if-critical}C%{endif}%{if-fatal}F%{endif}] %{file}:%{line} - %{message}";

QtMessageHandler Logging::originalHandler = nullptr;

void Logging::setupLogging()
{
    fileName = Settings::instance().value("Log", "logFile").toString();
    messagePattern = Settings::instance().value("Log", "pattern").toString();
    maxFileSize = Settings::instance().value("Log", "maxSize").toLongLong();
    maxBackupFiles = Settings::instance().value("Log", "backups").toInt();
    outputToConsole = Settings::instance().value("Log", "consoleOutput").toBool();
    outputToFile = Settings::instance().value("Log", "fileOutput").toBool();

    qSetMessagePattern(messagePattern);
    originalHandler = qInstallMessageHandler(Logging::logMessageHandler);
}

void Logging::logMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
    QString message = qFormatLogMessage(type, context, msg);

    if (outputToFile) {
        static FILE *f = fopen(Logging::fileName.toLocal8Bit().constData(), "a");
        if (f) {
            fprintf(f, "%s\n", qPrintable(message));
            fflush(f);
        }
        else {
            f = fopen(Logging::fileName.toLocal8Bit().constData(), "a");
            if (f) {
                fprintf(f, "%s\n", qPrintable(message));
                fflush(f);
            }
        }

        struct stat st;
        stat(Logging::fileName.toLocal8Bit().constData(), &st);
        auto fileSize = st.st_size;
        if(fileSize > Logging::maxFileSize) {
            if (f) {
                fclose(f);
                f = nullptr;
            }
            rollLogFiles();
        }
    }

    if (originalHandler && outputToConsole)
        (*originalHandler)(type, context, msg);
}

void Logging::rollLogFiles()
{
    QFile::remove(QString("%1.%2").arg(Logging::fileName).arg(Logging::maxBackupFiles));
    for(int i = Logging::maxBackupFiles - 1; i > 0; i--)
        QFile::rename(QString("%1.%2").arg(Logging::fileName).arg(i), QString("%1.%2").arg(Logging::fileName).arg(i + 1));
    QFile::rename(Logging::fileName, QString("%1.1").arg(Logging::fileName));
}