/*
* Copyright Onix Solutions Limited [OnixS]. All rights reserved.
*
* This software owned by Onix Solutions Limited [OnixS] and is protected by copyright law
* and international copyright treaties.
*
* Access to and use of the software is governed by the terms of the applicable OnixS Software
* Services Agreement (the Agreement) and Customer end user license agreements granting
* a non-assignable, non-transferable and non-exclusive license to use the software
* for it's own data processing purposes under the terms defined in the Agreement.
*
* Except as otherwise granted within the terms of the Agreement, copying or reproduction of any part
* of this source code or associated reference material to any other location for further reproduction
* or redistribution, and any amendments to this copyright notice, are expressly prohibited.
*
* Any reproduction or redistribution for sale or hiring of the Software not in accordance with
* the terms of the Agreement is a violation of copyright law.
*/

#pragma once

#include <string>

#include <OnixS/FIXEngine/ABI.h>
#include <OnixS/FIXEngine/FIX/TimeSpan.h>

namespace OnixS {
namespace FIX {
typedef Amount Year;
typedef Amount Day;

typedef Amount Hour;
typedef Amount Minute;
typedef Amount Second;

typedef Amount Millisecond;
typedef Amount Microsecond;
typedef Amount Nanosecond;
typedef HugeAmount Picosecond;

/// Defines all the months in the year.
struct ONIXS_FIXENGINE_API Month {
    enum Enum {
        Undefined,
        January,
        February,
        March,
        April,
        May,
        June,
        July,
        August,
        September,
        October,
        November,
        December
    };
};

/// Year, month, day fields.
struct ONIXS_FIXENGINE_API YearMonthDay {
    Year year;
    Month::Enum month;
    Day day;
};

/// The collection of timestamp formats supported.
struct ONIXS_FIXENGINE_API TimestampFormat {
    enum Enum {
        /// Indicates the timestamp in the "YYYYMMDD" format.
        YYYYMMDD,

        /// Indicates the timestamp in the "YYYYMMDD-HH:MM:SS" format.
        YYYYMMDDHHMMSS,

        /// Indicates the timestamp in the "YYYYMMDD-HH:MM:SS.sss" format.
        YYYYMMDDHHMMSSMsec,

        /// Indicates the timestamp in the "YYYYMMDD-HH:MM:SS.ssssss" format.
        YYYYMMDDHHMMSSUsec,

        /// Indicates the timestamp in the "YYYYMMDD-HH:MM:SS.sssssssss" format.
        YYYYMMDDHHMMSSNsec,

        /// Indicates the timestamp in the "YYYYMMDD-HH:MM:SS.ssssssssssss" format.
        YYYYMMDDHHMMSSPsec
    };
};

/// The timestamps related functionality.
class ONIXS_FIXENGINE_API Timestamp
{
public:
    /// Constructs an uninitialized instance.
    Timestamp();

    /// Initializes from seconds and nanoseconds since Jan 1, 0001, 00:00:00.
    Timestamp(
        TotalSeconds seconds,
        Nanosecond nanosecond);

    /// Initializes from seconds and picoseconds since Jan 1, 0001, 00:00:00.
    Timestamp(
        TotalSeconds seconds,
        Picosecond picosecond);

    /// Initializes date-time from all details.
    Timestamp(
        Year year, Month::Enum month, Day day,
        Hour hour = 0, Minute minute = 0, Second second = 0,
        Nanosecond nanosecond = 0);

    /// Initializes date-time from all details.
    Timestamp(
        Year year, Month::Enum month, Day day,
        Hour hour, Minute minute, Second second,
        Picosecond picosecond);

    /// Initializes from nanoseconds since Jan 1, 1970, 00:00:00 (Unix epoch).
    explicit Timestamp(TotalNanoseconds unixTimestampNanoseconds);

    /// The current year.
    Year year() const;

    /// The current month.
    Month::Enum month() const;

    /// The current day of month.
    /// Valid values are 1 through 31.
    Day day() const;

    /// Returns the date part of the timestamp.
    void date(YearMonthDay &) const;

    /// The current hour.
    /// Valid values are 0 through 23.
    Hour hour() const;

    /// The current minute.
    /// Valid values are 0 through 59.
    Minute minute() const;

    /// The current second.
    /// Valid values are 0 through 59.
    Second second() const;

    /// The current millisecond.
    /// Valid values are 0 through 999.
    Millisecond millisecond() const;

    /// The current microsecond.
    /// Valid values are 0 through 999999.
    Microsecond microsecond() const;

    /// The current nanosecond.
    /// Valid values are 0 through 999999999.
    Nanosecond nanosecond() const;

    /// The current picosecond.
    /// Valid values are 0 through 999999999999.
    Picosecond picosecond() const;

    /// The total number of seconds since Jan 1, 0001, 00:00:00.
    TotalSeconds totalSeconds() const;

    /// Compares the instance with another one.
    bool operator == (const Timestamp &) const;

    /// Compares the instance with another one.
    bool operator != (const Timestamp &) const;

    /// Tests whether the instance is less than another one.
    bool operator < (const Timestamp &) const;

    ///  Increases the instance by time span
    Timestamp & operator += (const TimeSpan &);

    ///  Decreases the instance by time span
    Timestamp & operator -= (const TimeSpan &);

    /// Returns the timestamp text presentation in the requested
    /// format ("YYYYMMDD-HH:MM:SS.sssssssss" by default).
    std::string
    toString(
        TimestampFormat::Enum =
            TimestampFormat::YYYYMMDDHHMMSSNsec) const;

    /// Appends the timestamp text presentation in the requested
    /// format ("YYYYMMDD-HH:MM:SS.sssssssss" by default).
    void
    toString(
        std::string & str,
        TimestampFormat::Enum =
            TimestampFormat::YYYYMMDDHHMMSSNsec) const;

    /// Returns the nanosecond timestamp since the Unix epoch.
    TotalNanoseconds toUnixNanosecondTimestamp() const;

    /// Returns the current UTC time.
    ///
    /// @note The timestamp resolution depends on
    /// capabilities of an operating system.
    static Timestamp utc();

    /// Returns the current local time.
    ///
    /// @note The timestamp resolution depends on
    /// capabilities of an operating system.
    static Timestamp local();

    /// Parses the timestamp from its text presentation assuming it's in
    /// the specified format ("YYYYMMDD-HH:MM:SS.sssssssss" by default).
    static
    Timestamp
    parse(
        const std::string &,
        TimestampFormat::Enum =
            TimestampFormat::YYYYMMDDHHMMSSNsec);

private:
    friend class TimeManager;

    TotalSeconds totalSeconds_;
    Picosecond picoseconds_;
};

inline
Timestamp::Timestamp(
    TotalSeconds totalSeconds, Nanosecond subseconds)
    : totalSeconds_(totalSeconds),
      picoseconds_(subseconds * static_cast<Picosecond>(TimeDetails::PicosecondsPerNanosecond))
{
}

inline
Timestamp::Timestamp(
    TotalSeconds totalSeconds, Picosecond subseconds)
    : totalSeconds_(totalSeconds),
      picoseconds_(subseconds)
{
}

inline
TotalSeconds
Timestamp::totalSeconds() const
{
    return totalSeconds_;
}

inline
Millisecond
Timestamp::millisecond() const
{
    return static_cast<Millisecond>(picoseconds_ / TimeDetails::PicosecondsPerMillisecond);
}

inline
Microsecond
Timestamp::microsecond() const
{
    return static_cast<Microsecond>(picoseconds_ / TimeDetails::PicosecondsPerMicrosecond);
}

inline
Nanosecond
Timestamp::nanosecond() const
{
    return static_cast<Nanosecond>(picoseconds_ / TimeDetails::PicosecondsPerNanosecond);
}

inline
Picosecond
Timestamp::picosecond() const
{
    return picoseconds_;
}

inline
std::string
Timestamp::toString(
    TimestampFormat::Enum format) const
{
    std::string str;

    toString(str, format);

    return str;
}
}
}