/******************************************************************************
 *
 * 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_DAILYROLLINGFILEAPPENDER_H
#define LOG4QT_DAILYROLLINGFILEAPPENDER_H

#include "fileappender.h"

#include <QDateTime>

namespace Log4Qt
{

/*!
 * \brief The class DailyRollingFileAppender extends FileAppender so that the
 *        underlying file is rolled over at a specified frequency.
 *
 * \note All the functions declared in this class are thread-safe.
 *
 * \note The ownership and lifetime of objects of this class are managed. See
 *       \ref Ownership "Object ownership" for more details.
 */
class LOG4QT_EXPORT DailyRollingFileAppender : public FileAppender
{
    Q_OBJECT

    /*!
     * The property holds the date pattern used by the appender.
     *
     * The default is DAILY_ROLLOVER for rollover at midnight each day.
     *
     * \sa datePattern(), setDatePattern()
     */
    Q_PROPERTY(QString datePattern READ datePattern WRITE setDatePattern)

public:
    /*!
     * The enum DatePattern defines constants for date patterns.
     *
     * \sa setDatePattern(DatePattern)
     */
    enum DatePattern
    {
        /*! The minutely date pattern string is "'.'yyyy-MM-dd-hh-mm". */
        MINUTELY_ROLLOVER = 0,
        /*! The hourly date pattern string is "'.'yyyy-MM-dd-hh". */
        HOURLY_ROLLOVER,
        /*! The half-daily date pattern string is "'.'yyyy-MM-dd-a". */
        HALFDAILY_ROLLOVER,
        /*! The daily date pattern string is "'.'yyyy-MM-dd". */
        DAILY_ROLLOVER,
        /*! The weekly date pattern string is "'.'yyyy-ww". */
        WEEKLY_ROLLOVER,
        /*! The monthly date pattern string is "'.'yyyy-MM". */
        MONTHLY_ROLLOVER
    };
    Q_ENUM(DatePattern)

    DailyRollingFileAppender(QObject *parent = nullptr);
    DailyRollingFileAppender(const LayoutSharedPtr &layout,
                             const QString &fileName,
                             const QString &datePattern,
                             QObject *parent = nullptr);

private:
    Q_DISABLE_COPY(DailyRollingFileAppender)
public:
    QString datePattern() const;

    /*!
    * Sets the datePattern to the value specified by the \a datePattern
    * constant.
    */
    void setDatePattern(DatePattern datePattern);

    void setDatePattern(const QString &datePattern);

    void activateOptions() override;

protected:
    void append(const LoggingEvent &event) override;

    /*!
     * Tests if all entry conditions for using append() in this class are
     * met.
     *
     * If a conditions is not met, an error is logged and the function
     * returns false. Otherwise the result of
     * FileAppender::checkEntryConditions() is returned.
     *
     * The checked conditions are:
     * - A valid pattern has been set (APPENDER_USE_INVALID_PATTERN_ERROR)
     *
     * The function is called as part of the checkEntryConditions() chain
     * started by AppenderSkeleton::doAppend().
     *
     * \sa AppenderSkeleton::doAppend(),
     *     AppenderSkeleton::checkEntryConditions()
     */
    bool checkEntryConditions() const override;

private:
    void computeFrequency();
    void computeRollOvetime();
    QString frequencyToString() const;
    void rollOver();

private:
    QString mDatePattern;
    DatePattern mFrequency;
    QString mActiveDatePattern;
    QDateTime mRollOvetime;
    QString mRollOverSuffix;
};

inline QString DailyRollingFileAppender::datePattern() const
{
    QMutexLocker locker(&mObjectGuard);
    return mDatePattern;
}

inline void DailyRollingFileAppender::setDatePattern(const QString &datePattern)
{
    QMutexLocker locker(&mObjectGuard);
    mDatePattern = datePattern;
}


} // namespace Log4Qt

#endif // LOG4QT_DAILYROLLINGFILEAPPENDER_H