//
// RotateStrategy.h
//
// Library: Foundation
// Package: Logging
// Module:  FileChannel
//
// Definition of the RotateStrategy class and subclasses.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_RotateStrategy_INCLUDED
#define Foundation_RotateStrategy_INCLUDED


#include "Poco/DateTimeParser.h"
#include "Poco/Exception.h"
#include "Poco/Foundation.h"
#include "Poco/LogFile.h"
#include "Poco/NumberParser.h"
#include "Poco/StringTokenizer.h"
#include "Poco/Timespan.h"
#include "Poco/Timestamp.h"


namespace Poco
{


class Foundation_API RotateStrategy
/// The RotateStrategy is used by LogFile to determine when
/// a file must be rotated.
{
public:
    RotateStrategy();
    virtual ~RotateStrategy();

    virtual bool mustRotate(LogFile * pFile) = 0;
    /// Returns true if the given log file must
    /// be rotated, false otherwise.

private:
    RotateStrategy(const RotateStrategy &);
    RotateStrategy & operator=(const RotateStrategy &);
};


template <class DT>
class RotateAtTimeStrategy : public RotateStrategy
/// The file is rotated at specified [day,][hour]:minute
{
public:
    RotateAtTimeStrategy(const std::string & rtime) : _day(-1), _hour(-1), _minute(0)
    {
        if (rtime.empty())
            throw InvalidArgumentException("Rotation time must be specified.");

        if ((rtime.find(',') != rtime.npos) && (rtime.find(':') == rtime.npos))
            throw InvalidArgumentException("Invalid rotation time specified.");

        StringTokenizer timestr(rtime, ",:", StringTokenizer::TOK_TRIM | StringTokenizer::TOK_IGNORE_EMPTY);
        int index = 0;

        switch (timestr.count())
        {
            case 3: // day,hh:mm
            {
                std::string::const_iterator it = timestr[index].begin();
                _day = DateTimeParser::parseDayOfWeek(it, timestr[index].end());
                ++index;
            }
            case 2: // hh:mm
                _hour = NumberParser::parse(timestr[index]);
                ++index;
            case 1: // mm
                _minute = NumberParser::parse(timestr[index]);
                break;
            default:
                throw InvalidArgumentException("Invalid rotation time specified.");
        }
        getNextRollover();
    }

    ~RotateAtTimeStrategy() { }

    bool mustRotate(LogFile * /*pFile*/)
    {
        if (DT() >= _threshold)
        {
            getNextRollover();
            return true;
        }
        return false;
    }

private:
    void getNextRollover()
    {
        Timespan tsp(0, 0, 1, 0, 1000); // 0,00:01:00.001
        do
        {
            _threshold += tsp;
        } while (
            !(_threshold.minute() == _minute && (-1 == _hour || _threshold.hour() == _hour)
              && (-1 == _day || _threshold.dayOfWeek() == _day)));
        // round to :00.0 seconds
        _threshold.assign(_threshold.year(), _threshold.month(), _threshold.day(), _threshold.hour(), _threshold.minute());
    }

    DT _threshold;
    int _day;
    int _hour;
    int _minute;
};


class Foundation_API RotateByIntervalStrategy : public RotateStrategy
/// The file is rotated when the log file
/// exceeds a given age.
///
/// For this to work reliably across all platforms and file systems
/// (there are severe issues on most platforms finding out the real
/// creation date of a file), the creation date of the file is
/// written into the log file as the first entry.
{
public:
    RotateByIntervalStrategy(const Timespan & span);
    ~RotateByIntervalStrategy();
    bool mustRotate(LogFile * pFile);

private:
    Timespan _span;
    Timestamp _lastRotate;
    static const std::string ROTATE_TEXT;
};


class Foundation_API RotateBySizeStrategy : public RotateStrategy
/// The file is rotated when the log file
/// exceeds a given size.
{
public:
    RotateBySizeStrategy(UInt64 size);
    ~RotateBySizeStrategy();
    bool mustRotate(LogFile * pFile);

private:
    UInt64 _size;
};


} // namespace Poco


#endif // Foundation_RotateStrategy_INCLUDED