/******************************************************************************
 *
 * This file is part of Log4Qt library.
 *
 * Copyright (C) 2007 - 2020 Log4Qt contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ******************************************************************************/

#ifndef LOG4QT_LOG4QTEVENT_H
#define LOG4QT_LOG4QTEVENT_H

#include "level.h"

#include <QHash>
#include <QStringList>
#include <QEvent>

#include <atomic>

namespace Log4Qt
{

class Logger;

class MessageContext
{
public:
    explicit MessageContext()
        : file(nullptr), line(-1), function(nullptr) {}
    explicit MessageContext(const char *fileName, int lineNumber, const char *functionName)
        : file(fileName), line(lineNumber), function(functionName) {}
    const char *file;
    int line;
    const char *function;
};

/*!
 * \brief The class LoggingEvent is the internal representation of a
 *        logging event.
 *
 * The class uses milliseconds since 1970-01-01T00:00:00, Coordinated
 * Universal Time for time values. For converstion from and to QDateTime
 * use DateTime.
 */
class LOG4QT_EXPORT LoggingEvent : public QEvent
{
public:
    static const QEvent::Type eventId;
    LoggingEvent();
    virtual ~LoggingEvent();

    LoggingEvent(const Logger *logger,
                 Level level,
                 const QString &message);
    LoggingEvent(const Logger *logger,
                 Level level,
                 const QString &message,
                 const MessageContext &context,
                 const QString &categoryName);
    LoggingEvent(const Logger *logger,
                 Level level,
                 const QString &message,
                 qint64 timeStamp);
    LoggingEvent(const Logger *logger,
                 Level level,
                 const QString &message,
                 const QString &ndc,
                 const QHash<QString, QString> &properties,
                 const QString &threadName,
                 qint64 timeStamp);
    LoggingEvent(const Logger *logger,
                 Level level,
                 const QString &message,
                 const QString &ndc,
                 const QHash<QString, QString> &properties,
                 qint64 timeStamp,
                 const MessageContext &context,
                 const QString &categoryName);
    LoggingEvent(const Logger *logger,
                 Level level,
                 const QString &message,
                 const QString &ndc,
                 const QHash<QString, QString> &properties,
                 const QString &threadName,
                 qint64 timeStamp,
                 const MessageContext &context,
                 const QString &categoryName);

    Level level() const;
    // LocationInformation locationInformation() const;
    const Logger *logger() const;
    QString message() const;
    QHash<QString, QString> mdc() const;
    QString ndc() const;
    QHash<QString, QString> properties() const;
    qint64 sequenceNumber() const;
    QString threadName() const;
    qint64 timeStamp() const;

    QString loggename() const;
    QString property(const QString &key) const;
    QStringList propertyKeys() const;
    void setProperty(const QString &key, const QString &value);
    QString toString() const;
    static qint64 sequenceCount();
    static qint64 startTime();

    int lineNumber() const;
    void setLineNumber(int lineNumber);
    QString fileName() const;
    void setFileName(const QString &fileName);
    QString functionName() const;
    void setMethodName(const QString &functionName);
    QString categoryName() const;
    void setCategoryName(const QString &categoryName);
    MessageContext context() const;
    void setContext(const MessageContext &context);

private:
    void setThreadNameToCurrent();
    static qint64 nextSequenceNumber();

private:
    Level mLevel;
    const Logger *mLogger;
    QString mMessage;
    QString mNdc;
    QHash<QString, QString> mProperties;
    qint64 mSequenceNumber;
    QString mThreadName;
    qint64 mTimeStamp;
    MessageContext mContext;
    QString mCategoryName;

    static std::atomic<qint64> msSequenceCount;

#ifndef QT_NO_DATASTREAM
    // Needs to be friend to stream objects
    friend LOG4QT_EXPORT QDataStream &operator<<(QDataStream &out,
                                                const LoggingEvent &loggingEvent);
    friend LOG4QT_EXPORT QDataStream &operator>>(QDataStream &in,
                                                 LoggingEvent &loggingEvent);
#endif // QT_NO_DATASTREAM
};

#ifndef QT_NO_DATASTREAM
/*!
 * \relates LoggingEvent
 *
 * Writes the given error \a rLoggingEvent to the given stream \a rStream,
 * and returns a reference to the stream.
 */
LOG4QT_EXPORT QDataStream &operator<<(QDataStream &out,
                                      const LoggingEvent &loggingEvent);

/*!
 * \relates LoggingEvent
 *
 * Reads an error from the given stream \a rStream into the given
 * error \a rLoggingEvent, and returns a reference to the stream.
 */
LOG4QT_EXPORT QDataStream &operator>>(QDataStream &in,
                                      LoggingEvent &loggingEvent);
#endif // QT_NO_DATASTREAM

inline Level LoggingEvent::level() const
{
    return mLevel;
}

inline const Logger *LoggingEvent::logger() const
{
    return mLogger;
}

inline QString LoggingEvent::message() const
{
    return mMessage;
}

inline QHash<QString, QString> LoggingEvent::mdc() const
{
    return mProperties;
}

inline QString LoggingEvent::ndc() const
{
    return mNdc;
}

inline QHash<QString, QString> LoggingEvent::properties() const
{
    return mProperties;
}

inline qint64 LoggingEvent::sequenceNumber() const
{
    return mSequenceNumber;
}

inline QString LoggingEvent::threadName() const
{
    return mThreadName;
}

inline qint64 LoggingEvent::timeStamp() const
{
    return mTimeStamp;
}

inline QString LoggingEvent::property(const QString &key) const
{
    return mProperties.value(key);
}

inline QStringList LoggingEvent::propertyKeys() const
{
    return QStringList(mProperties.keys());
}

inline void LoggingEvent::setProperty(const QString &key, const QString &value)
{
    mProperties.insert(key, value);
}


} // namespace Log4Qt


Q_DECLARE_METATYPE(Log4Qt::LoggingEvent)
Q_DECLARE_TYPEINFO(Log4Qt::LoggingEvent, Q_MOVABLE_TYPE);


#endif // LOG4QT_LOG4QTEVENT_H