Duration.cpp

/*
 * Copyright(c) Sophist Solutions, Inc. 1990-2026.  All rights reserved
 */
#include "Stroika/Foundation/StroikaPreComp.h"
 
#include <cmath>
#include <cstdio>
 
#include "Stroika/Foundation/Characters/CString/Utilities.h"
#include "Stroika/Foundation/Characters/FloatConversion.h"
#include "Stroika/Foundation/Characters/Format.h"
#include "Stroika/Foundation/Debug/Assertions.h"
#include "Stroika/Foundation/Debug/Trace.h"
#include "Stroika/Foundation/Linguistics/MessageUtilities.h"
#include "Stroika/Foundation/Math/Common.h"
#include "Stroika/Foundation/Time/Duration.h"
 
using namespace Stroika::Foundation;
using namespace Stroika::Foundation::Characters;
using namespace Stroika::Foundation::Execution;
using namespace Stroika::Foundation::Time;
 
using Debug::TraceContextBumper;
 
using namespace Time;
 
// Comment this in to turn on aggressive noisy DbgTrace in this module
//#define   USE_NOISY_TRACE_IN_THIS_MODULE_       1
 
/*
 ********************************************************************************
 ********************** Duration::FormatException *******************************
 ********************************************************************************
 */
Duration::FormatException::FormatException ()
    : inherited{"Invalid Duration Format"sv}
{
}
 
/*
 ********************************************************************************
 *********************************** Duration ***********************************
 ********************************************************************************
 */
namespace {
    // sigh - not sure why so hard still -- LGP 2023-01-22 ;-)
    constexpr wstring_view kMS_ = L"\u00b5s"sv; // u8"µs"sv
    static_assert (kMS_.size () == 2 && kMS_[0] == 0x00B5 and kMS_[1] == 's');
    //static_assert (sizeof (u8"µ") == 3 and u8"µ"[0] == 0xC2 and u8"µ"[1] == 0xB5); // be sure above encoding working, since appantly not well standardized (file has UTF8 BOM)
}
const Duration::PrettyPrintInfo Duration::kDefaultPrettyPrintInfo = {{
    "year"sv,    "years"sv,  "month"sv,   "months"sv, "week"sv, "weeks"sv, "day"sv, "days"sv, "hour"sv, "hours"sv, "minute"sv,
    "minutes"sv, "second"sv, "seconds"sv, "ms"sv,     "ms"sv,   kMS_,      kMS_,    "ns"sv,   "ns"sv,   "ps"sv,    "ps"sv,
}};
 
const Duration::AgePrettyPrintInfo Duration::kDefaultAgePrettyPrintInfo = {
    {
        "now"sv,
        "ago"sv,
        "from now"sv,
    },
    12 * 60 /*fNowThreshold*/
};
 
Duration& Duration::operator+= (const Duration& rhs)
{
    *this = *this + rhs;
    return *this;
}
 
Duration& Duration::operator-= (const Duration& rhs)
{
    *this = *this - rhs;
    return *this;
}
 
namespace {
    string::const_iterator SkipWhitespace_ (string::const_iterator i, string::const_iterator end)
    {
        // GNU LIBC code (header) says that whitespace is allowed (though I've found no external docs to support this).
        // Still - no harm in accepting this - so long as we don't ever generate it...
        while (i != end and isspace (*i)) {
            ++i;
        }
        Ensure (i <= end);
        return i;
    }
    string::const_iterator FindFirstNonDigitOrDot_ (string::const_iterator i, string::const_iterator end)
    {
        while (i != end and (isdigit (*i) or *i == '.')) {
            ++i;
        }
        Ensure (i <= end);
        return i;
    }
 
    constexpr time_t kSecondsPerMinute_ = 60;
    constexpr time_t kSecondsPerHour_   = kSecondsPerMinute_ * 60;
    constexpr time_t kSecondsPerDay_    = kSecondsPerHour_ * 24;
    constexpr time_t kSecondsPerWeek_   = kSecondsPerDay_ * 7;
    constexpr time_t kSecondsPerMonth_  = kSecondsPerDay_ * 30;
    constexpr time_t kSecondsPerYear_   = kSecondsPerDay_ * 365;
}
 
String Duration::PrettyPrint (const PrettyPrintInfo& prettyPrintInfo) const
{
    auto                lingMgr = Linguistics::MessageUtilities::Manager::sThe.LookupHandler ();
    static const String kCommaSpace_{", "sv};
    if (empty ()) {
        return String{};
    }
    /*
     *  From http://physics.nist.gov/cuu/Units/checklist.html
     *      There is a space between the numerical value and unit symbol, even when the value is used
     *      in an adjectival sense, except in the case of superscript units for plane angle.
     */
    static const String kSpaceBeforeUnit_{" "sv};
 
    InternalNumericFormatType_ t        = As<InternalNumericFormatType_> ();
    bool                       isNeg    = (t < 0);
    InternalNumericFormatType_ timeLeft = t < 0 ? -t : t;
    StringBuilder              result;
    if (timeLeft >= kSecondsPerYear_) {
        unsigned int nYears = static_cast<unsigned int> (timeLeft / kSecondsPerYear_);
        if (nYears != 0) {
            if (not result.empty ()) {
                result << kCommaSpace_;
            }
            result << nYears << kSpaceBeforeUnit_
                   << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fYear, prettyPrintInfo.fLabels.fYears, static_cast<int> (nYears));
            timeLeft -= nYears * kSecondsPerYear_;
        }
    }
    if (timeLeft >= kSecondsPerMonth_) {
        unsigned int nMonths = static_cast<unsigned int> (timeLeft / kSecondsPerMonth_);
        if (nMonths != 0) {
            if (not result.empty ()) {
                result << kCommaSpace_;
            }
            result << "{}"_f(nMonths) << kSpaceBeforeUnit_
                   << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fMonth, prettyPrintInfo.fLabels.fMonths, static_cast<int> (nMonths));
            timeLeft -= nMonths * kSecondsPerMonth_;
        }
    }
    if (timeLeft >= kSecondsPerDay_) {
        unsigned int nDays = static_cast<unsigned int> (timeLeft / kSecondsPerDay_);
        if (nDays != 0) {
            if (not result.empty ()) {
                result << kCommaSpace_;
            }
            result << "{}"_f(nDays) << kSpaceBeforeUnit_
                   << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fDay, prettyPrintInfo.fLabels.fDays, static_cast<int> (nDays));
            timeLeft -= nDays * kSecondsPerDay_;
        }
    }
    if (timeLeft != 0) {
        if (timeLeft >= kSecondsPerHour_) {
            unsigned int nHours = static_cast<unsigned int> (timeLeft / kSecondsPerHour_);
            if (nHours != 0) {
                if (not result.empty ()) {
                    result << kCommaSpace_;
                }
                result << "{}"_f(nHours) << kSpaceBeforeUnit_
                       << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fHour, prettyPrintInfo.fLabels.fHours, static_cast<int> (nHours));
                timeLeft -= nHours * kSecondsPerHour_;
            }
        }
        if (timeLeft >= kSecondsPerMinute_) {
            unsigned int nMinutes = static_cast<unsigned int> (timeLeft / kSecondsPerMinute_);
            if (nMinutes != 0) {
                if (not result.empty ()) {
                    result << kCommaSpace_;
                }
                result << "{}"_f(nMinutes) << kSpaceBeforeUnit_
                       << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fMinute, prettyPrintInfo.fLabels.fMinutes, static_cast<int> (nMinutes));
                timeLeft -= nMinutes * kSecondsPerMinute_;
            }
        }
        if (timeLeft > 0) {
            int timeLeftAsInt = static_cast<int> (timeLeft);
            if (timeLeftAsInt != 0) {
                Assert (timeLeftAsInt > 0);
                if (not result.empty ()) {
                    result += kCommaSpace_;
                }
                // Map 3.242 to printing out 3.242, but 0.234 prints out as 234 milliseconds
                if (fabs (timeLeft - timeLeftAsInt) < 0.001) {
                    result << "{}"_f(static_cast<int> (timeLeft)) << kSpaceBeforeUnit_
                           << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fSecond, prettyPrintInfo.fLabels.fSeconds, timeLeftAsInt);
                    timeLeft -= static_cast<int> (timeLeft);
                }
                else {
                    result << "{:.3f}"_f(timeLeft) << kSpaceBeforeUnit_ << prettyPrintInfo.fLabels.fSeconds;
                    timeLeft = 0.0;
                }
            }
        }
        if (timeLeft > 0) {
            // DO nano, micro, milliseconds here
 
            static const FloatConversion::ToStringOptions kFinalFloatOptions_{FloatConversion::eDefaultFloat};
 
            static constexpr bool kFirstSubSecondUnitDoDecimalPlaceImmediately_{true};
 
            uint16_t nMilliseconds = static_cast<uint16_t> (floor (timeLeft * 1.0e3));
            Assert (0 <= nMilliseconds and nMilliseconds < 1000);
            // intentionally show something like 1003 us as 1003 us, not 1.003 ms
            if (nMilliseconds > 2 or Math::NearlyEquals (timeLeft, .001) or Math::NearlyEquals (timeLeft, .002)) {
                if (not result.empty ()) {
                    result << kCommaSpace_;
                }
                if (kFirstSubSecondUnitDoDecimalPlaceImmediately_) {
                    result << FloatConversion::ToString (timeLeft * 1.0e3, kFinalFloatOptions_) << kSpaceBeforeUnit_
                           << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fMilliSecond, prettyPrintInfo.fLabels.fMilliSeconds, nMilliseconds);
                    timeLeft = 0;
                }
                else {
                    result << int (nMilliseconds) << kSpaceBeforeUnit_
                           << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fMilliSecond, prettyPrintInfo.fLabels.fMilliSeconds, nMilliseconds);
                    timeLeft -= 1.0e-3 * nMilliseconds;
                }
            }
            uint16_t nMicroSeconds = static_cast<uint16_t> (floor (timeLeft * 1.0e6));
            if (nMicroSeconds > 0) {
                if (not result.empty ()) {
                    result << kCommaSpace_;
                }
                if (kFirstSubSecondUnitDoDecimalPlaceImmediately_) {
                    result << FloatConversion::ToString (timeLeft * 1.0e6, kFinalFloatOptions_) << kSpaceBeforeUnit_
                           << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fMicroSecond, prettyPrintInfo.fLabels.fMicroSeconds, nMicroSeconds);
                    timeLeft = 0;
                }
                else {
                    result << int (nMicroSeconds) << kSpaceBeforeUnit_
                           << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fMicroSecond, prettyPrintInfo.fLabels.fMicroSeconds, nMicroSeconds);
                    timeLeft -= 1.0e-6 * nMicroSeconds;
                }
            }
            uint16_t nNanoSeconds = static_cast<uint16_t> (floor (timeLeft * 1.0e9));
            if (nNanoSeconds > 0) {
                if (not result.empty ()) {
                    result << kCommaSpace_;
                }
                if (kFirstSubSecondUnitDoDecimalPlaceImmediately_) {
                    result << FloatConversion::ToString (timeLeft * 1.0e9, kFinalFloatOptions_) << kSpaceBeforeUnit_
                           << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fNanoSecond, prettyPrintInfo.fLabels.fNanoSeconds, nNanoSeconds);
                    timeLeft = 0;
                }
                else {
                    result << int (nMicroSeconds) << kSpaceBeforeUnit_
                           << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fNanoSecond, prettyPrintInfo.fLabels.fNanoSecond, nNanoSeconds);
                    timeLeft -= 1.0e-9 * nNanoSeconds;
                }
            }
            Duration::InternalNumericFormatType_ nPicoSeconds = timeLeft * 1.0e12;
            if (nPicoSeconds > 1.0e-5) {
                if (not result.empty ()) {
                    result << kCommaSpace_;
                }
                Duration::InternalNumericFormatType_ extraBits = nPicoSeconds - floor (nPicoSeconds);
                if (extraBits > 1.0e-2) {
                    result << nPicoSeconds << kSpaceBeforeUnit_
                           << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fPicoSecond, prettyPrintInfo.fLabels.fPicoSeconds, 2);
                }
                else {
                    result << int (nPicoSeconds) << kSpaceBeforeUnit_
                           << lingMgr->PluralizeNoun (prettyPrintInfo.fLabels.fPicoSecond, prettyPrintInfo.fLabels.fPicoSeconds, int (nPicoSeconds));
                }
            }
        }
    }
    if (result.empty ()) {
        result << "0"sv << kSpaceBeforeUnit_ << prettyPrintInfo.fLabels.fSeconds;
    }
    if (isNeg) {
        static const String kNeg_{"-"sv};
        result = kNeg_ + result;
    }
    return result;
}
 
String Duration::PrettyPrintAge (const AgePrettyPrintInfo& agePrettyPrintInfo, const PrettyPrintInfo& prettyPrintInfo) const
{
    InternalNumericFormatType_ t     = As<InternalNumericFormatType_> ();
    bool                       isNeg = (t < 0);
    InternalNumericFormatType_ absT  = isNeg ? -t : t;
    if (absT < agePrettyPrintInfo.fNowThreshold) {
        return agePrettyPrintInfo.fLabels.fNow;
    }
 
    String suffix = isNeg ? agePrettyPrintInfo.fLabels.fAgo : agePrettyPrintInfo.fLabels.fFromNow;
 
    auto fmtDate = [suffix] (int timeInSelectedUnit, const String& singularUnit, const String& pluralUnit) -> String {
        String label = Linguistics::MessageUtilities::Manager::sThe.PluralizeNoun (singularUnit, pluralUnit, timeInSelectedUnit);
        return "{} {} {}"_f(timeInSelectedUnit, label, suffix);
    };
 
    constexpr InternalNumericFormatType_ kShowAsMinutesIfLess_ = 55 * kSecondsPerMinute_;
    constexpr InternalNumericFormatType_ kShowHoursIfLess_     = 23 * kSecondsPerHour_;
    constexpr InternalNumericFormatType_ kShowDaysIfLess_      = 14 * kSecondsPerDay_;
    constexpr InternalNumericFormatType_ kShowWeeksIfLess_     = 59 * kSecondsPerDay_;
    constexpr InternalNumericFormatType_ kShowMonthsIfLess_    = 11 * kSecondsPerMonth_;
 
    if (absT < kShowAsMinutesIfLess_) {
        return fmtDate (Math::Round<int> (absT / kSecondsPerMinute_), prettyPrintInfo.fLabels.fMinute, prettyPrintInfo.fLabels.fMinutes);
    }
    if (absT < kShowHoursIfLess_) {
        return fmtDate (Math::Round<int> (absT / kSecondsPerHour_), prettyPrintInfo.fLabels.fHour, prettyPrintInfo.fLabels.fHours);
    }
    if (absT < kShowDaysIfLess_ and not Math::NearlyEquals (absT, static_cast<InternalNumericFormatType_> (kSecondsPerWeek_), 1.0)) {
        return fmtDate (Math::Round<int> (absT / kSecondsPerDay_), prettyPrintInfo.fLabels.fDay, prettyPrintInfo.fLabels.fDays);
    }
    if (absT < kShowWeeksIfLess_ and not Math::NearlyEquals (absT, static_cast<InternalNumericFormatType_> (kSecondsPerMonth_), 1.0)) {
        return fmtDate (Math::Round<int> (absT / kSecondsPerWeek_), prettyPrintInfo.fLabels.fWeek, prettyPrintInfo.fLabels.fWeeks);
    }
    if (absT < kShowMonthsIfLess_) {
        return fmtDate (Math::Round<int> (absT / kSecondsPerMonth_), prettyPrintInfo.fLabels.fMonth, prettyPrintInfo.fLabels.fMonths);
    }
    return fmtDate (Math::Round<int> (absT / kSecondsPerYear_), prettyPrintInfo.fLabels.fYear, prettyPrintInfo.fLabels.fYears);
}
 
Duration Duration::operator- () const
{
    String tmp = As<String> ();
    if (tmp.empty ()) {
        return *this;
    }
    if (tmp[0] == '-') {
        return Duration{tmp.substr (1)};
    }
    else {
        return Duration{"-"sv + tmp};
    }
}
 
Duration::InternalNumericFormatType_ Duration::ParseTime_ (const string& s)
{
#if USE_NOISY_TRACE_IN_THIS_MODULE_
    Debug::TraceContextBumper ctx{"Duration::ParseTime_", "s = {}"_f, s};
#endif
    if (s.empty ()) {
        return kValueWhenEmptyRenderedAsNumber_;
    }
    InternalNumericFormatType_ curVal = 0;
    bool                       isNeg  = false;
    // compute and throw if bad...
    string::const_iterator i = SkipWhitespace_ (s.begin (), s.end ());
    if (*i == '-') {
        isNeg = true;
        i     = SkipWhitespace_ (i + 1, s.end ());
    }
    if (*i == 'P') [[likely]] {
        i = SkipWhitespace_ (i + 1, s.end ());
    }
    else {
        Throw (FormatException::kThe);
    }
    bool timePart = false;
    while (i != s.end ()) {
        if (*i == 'T') {
            timePart = true;
            i        = SkipWhitespace_ (i + 1, s.end ());
            continue;
        }
        string::const_iterator firstDigitI = i;
        string::const_iterator lastDigitI  = FindFirstNonDigitOrDot_ (i, s.end ());
        if (lastDigitI == s.end ()) [[unlikely]] {
            Throw (FormatException::kThe);
        }
        if (firstDigitI == lastDigitI) [[unlikely]] {
            Throw (FormatException::kThe);
        }
        /*
         *  According to http://en.wikipedia.org/wiki/ISO_8601
         *      "The smallest value used may also have a decimal fraction, as in "P0.5Y" to indicate
         *      half a year. This decimal fraction may be specified with either a comma or a full stop,
         *      as in "P0,5Y" or "P0.5Y"."
         *
         *  @todo   See todo in header: the first/last digit range could use '.' or ',' and I'm not sure atof is as flexible
         *  test/verify!!!
         */
        InternalNumericFormatType_ n = ::atof (string{firstDigitI, lastDigitI}.c_str ());
        switch (*lastDigitI) {
            case 'Y':
                curVal += n * kSecondsPerYear_;
                break;
            case 'M':
                curVal += n * (timePart ? kSecondsPerMinute_ : kSecondsPerMonth_);
                break;
            case 'W':
                curVal += n * kSecondsPerWeek_;
                break;
            case 'D':
                curVal += n * kSecondsPerDay_;
                break;
            case 'H':
                curVal += n * kSecondsPerHour_;
                break;
            case 'S':
                curVal += n;
                break;
        }
        i = SkipWhitespace_ (lastDigitI + 1, s.end ());
    }
    return isNeg ? -curVal : curVal;
}
 
String Duration::UnParseTime_ (InternalNumericFormatType_ t, FloatConversion::SignificantFigures p)
{
#if USE_NOISY_TRACE_IN_THIS_MODULE_
    Debug::TraceContextBumper ctx{"Duration::UnParseTime_", "t = {:e}, p={}"_f, t, p};
#endif
    Require (not isnan (t));
    bool                       isNeg    = (t < 0);
    InternalNumericFormatType_ timeLeft = t < 0 ? -t : t;
    StringBuilder              result;
    if (isNeg) {
        result += "-"sv;
    }
    result += "P"sv;
    if (timeLeft >= kSecondsPerYear_) {
        InternalNumericFormatType_ nYears = trunc (timeLeft / kSecondsPerYear_);
        Assert (nYears > 0.0);
        if (nYears > 0.0) {
            qStroika_ATTRIBUTE_INDETERMINATE char buf[10 * 1024];
            (void)::snprintf (buf, sizeof (buf), "%.0LfY", static_cast<long double> (nYears));
            result += buf;
            timeLeft -= nYears * kSecondsPerYear_;
            if (isinf (timeLeft) or timeLeft < 0) {
                // some date numbers are so large, we cannot compute a number of days, weeks etc
                // Also, for reasons which elude me (e.g. 32 bit gcc builds) this can go negative.
                // Not strictly a bug (I don't think). Just roundoff.
                timeLeft = 0.0;
            }
        }
    }
    Assert (0.0 <= timeLeft and timeLeft < kSecondsPerYear_);
    if (timeLeft >= kSecondsPerMonth_) {
        unsigned int nMonths = static_cast<unsigned int> (timeLeft / kSecondsPerMonth_);
        if (nMonths != 0) {
            qStroika_ATTRIBUTE_INDETERMINATE char buf[1024];
            (void)::snprintf (buf, sizeof (buf), "%dM", nMonths);
            result += buf;
            timeLeft -= nMonths * kSecondsPerMonth_;
        }
    }
    Assert (0.0 <= timeLeft and timeLeft < kSecondsPerMonth_);
    if (timeLeft >= kSecondsPerDay_) {
        unsigned int nDays = static_cast<unsigned int> (timeLeft / kSecondsPerDay_);
        if (nDays != 0) {
            qStroika_ATTRIBUTE_INDETERMINATE char buf[1024];
            (void)::snprintf (buf, sizeof (buf), "%dD", nDays);
            result += buf;
            timeLeft -= nDays * kSecondsPerDay_;
        }
    }
    Assert (0.0 <= timeLeft and timeLeft < kSecondsPerDay_);
    if (timeLeft > 0) {
        result += "T"sv;
        if (timeLeft >= kSecondsPerHour_) {
            unsigned int nHours = static_cast<unsigned int> (timeLeft / kSecondsPerHour_);
            if (nHours != 0) {
                qStroika_ATTRIBUTE_INDETERMINATE char buf[1024];
                (void)::snprintf (buf, sizeof (buf), "%dH", nHours);
                result += buf;
                timeLeft -= nHours * kSecondsPerHour_;
            }
        }
        Assert (0.0 <= timeLeft and timeLeft < kSecondsPerHour_);
        if (timeLeft >= kSecondsPerMinute_) {
            unsigned int nMinutes = static_cast<unsigned int> (timeLeft / kSecondsPerMinute_);
            if (nMinutes != 0) {
                qStroika_ATTRIBUTE_INDETERMINATE char buf[1024];
                (void)::snprintf (buf, sizeof (buf), "%dM", nMinutes);
                result += buf;
                timeLeft -= nMinutes * kSecondsPerMinute_;
            }
        }
        Assert (0.0 <= timeLeft and timeLeft < kSecondsPerMinute_);
        if (timeLeft > 0.0) {
            using namespace FloatConversion;
            result += FloatConversion::ToString (timeLeft, ToStringOptions{p, eStandard});
            result += "S"sv;
        }
    }
    if (result.length () == 1) {
        result += "T0S"sv;
    }
    return result;
}
 
/*
 ********************************************************************************
 ******************************** Math::Abs *************************************
 ********************************************************************************
 */
namespace Stroika::Foundation::Math {
    Time::Duration Abs (Time::Duration v)
    {
        return (v.count () < 0) ? -v : v;
    }
}