path: root/src/openvic-simulation/types/Date.cpp

#include "Date.hpp"

#include <algorithm>
#include <cassert>
#include <cctype>
#include <charconv>

#include "openvic-simulation/utility/Logger.hpp"
#include "openvic-simulation/utility/StringUtils.hpp"

using namespace OpenVic;

Timespan::Timespan(day_t value) : days { value } {}

bool Timespan::operator<(Timespan other) const { return days < other.days; };
bool Timespan::operator>(Timespan other) const { return days > other.days; };
bool Timespan::operator<=(Timespan other) const { return days <= other.days; };
bool Timespan::operator>=(Timespan other) const { return days >= other.days; };
bool Timespan::operator==(Timespan other) const { return days == other.days; };
bool Timespan::operator!=(Timespan other) const { return days != other.days; };

Timespan Timespan::operator+(Timespan other) const { return days + other.days; }

Timespan Timespan::operator-(Timespan other) const { return days - other.days; }

Timespan Timespan::operator*(day_t factor) const { return days * factor; }

Timespan Timespan::operator/(day_t factor) const { return days / factor; }

Timespan& Timespan::operator+=(Timespan other) {
   days += other.days;
   return *this;
}

Timespan& Timespan::operator-=(Timespan other) {
   days -= other.days;
   return *this;
}

Timespan& Timespan::operator++() {
   days++;
   return *this;
}

Timespan Timespan::operator++(int) {
   Timespan old = *this;
   ++(*this);
   return old;
}

Timespan::operator day_t() const {
   return days;
}

Timespan::operator double() const {
   return days;
}

std::string Timespan::to_string() const {
   return std::to_string(days);
}

Timespan::operator std::string() const {
   return to_string();
}

std::ostream& OpenVic::operator<<(std::ostream& out, Timespan const& timespan) {
   return out << timespan.to_string();
}

Timespan Date::_dateToTimespan(year_t year, month_t month, day_t day) {
   month = std::clamp<month_t>(month, 1, MONTHS_IN_YEAR);
   day = std::clamp<day_t>(day, 1, DAYS_IN_MONTH[month - 1]);
   return year * DAYS_IN_YEAR + DAYS_UP_TO_MONTH[month - 1] + day - 1;
}

Timespan::day_t const* Date::DAYS_UP_TO_MONTH = generate_days_up_to_month();

Timespan::day_t const* Date::generate_days_up_to_month() {
   static Timespan::day_t days_up_to_month[MONTHS_IN_YEAR];
   Timespan::day_t days = 0;
   for (int month = 0; month < MONTHS_IN_YEAR;
      days_up_to_month[month] = days, days += DAYS_IN_MONTH[month++]);
   assert(days == DAYS_IN_YEAR);
   return days_up_to_month;
}

Date::month_t const* Date::MONTH_FROM_DAY_IN_YEAR = generate_month_from_day_in_year();

Date::month_t const* Date::generate_month_from_day_in_year() {
   static month_t month_from_day_in_year[DAYS_IN_YEAR];
   Timespan::day_t days_left = 0;
   for (int day = 0, month = 0; day < DAYS_IN_YEAR;
      days_left = (days_left > 0 ? days_left : DAYS_IN_MONTH[month++]) - 1,
      month_from_day_in_year[day++] = month);
   assert(days_left == 0);
   assert(month_from_day_in_year[DAYS_IN_YEAR - 1] == MONTHS_IN_YEAR);
   return month_from_day_in_year;
}

Date::Date(Timespan total_days) : timespan { total_days } {
   if (timespan < 0) {
      Logger::error("Invalid timespan for date: ", timespan, " (cannot be negative)");
      timespan = 0;
   }
}

Date::Date(year_t year, month_t month, day_t day) : timespan { _dateToTimespan(year, month, day) } {}

Date::year_t Date::getYear() const {
   return static_cast<Timespan::day_t>(timespan) / DAYS_IN_YEAR;
}

Date::month_t Date::getMonth() const {
   return MONTH_FROM_DAY_IN_YEAR[static_cast<Timespan::day_t>(timespan) % DAYS_IN_YEAR];
}

Date::day_t Date::getDay() const {
   return (static_cast<Timespan::day_t>(timespan) % DAYS_IN_YEAR) - DAYS_UP_TO_MONTH[getMonth() - 1] + 1;
}

bool Date::operator<(Date other) const { return timespan < other.timespan; };
bool Date::operator>(Date other) const { return timespan > other.timespan; };
bool Date::operator<=(Date other) const { return timespan <= other.timespan; };
bool Date::operator>=(Date other) const { return timespan >= other.timespan; };
bool Date::operator==(Date other) const { return timespan == other.timespan; };
bool Date::operator!=(Date other) const { return timespan != other.timespan; };

Date Date::operator+(Timespan other) const { return timespan + other; }

Timespan Date::operator-(Date other) const { return timespan - other.timespan; }

Date& Date::operator+=(Timespan other) {
   timespan += other;
   return *this;
}

Date& Date::operator-=(Timespan other) {
   timespan -= other;
   return *this;
}

Date& Date::operator++() {
   timespan++;
   return *this;
}

Date Date::operator++(int) {
   Date old = *this;
   ++(*this);
   return old;
}

std::string Date::to_string() const {
   std::stringstream ss;
   ss << *this;
   return ss.str();
}

Date::operator std::string() const {
   return to_string();
}

std::ostream& OpenVic::operator<<(std::ostream& out, Date const& date) {
   return out << static_cast<int>(date.getYear()) << Date::SEPARATOR_CHARACTER << static_cast<int>(date.getMonth()) << Date::SEPARATOR_CHARACTER << static_cast<int>(date.getDay());
}

// Parsed from string of the form YYYY.MM.DD
Date Date::from_string(char const* const str, char const* const end, bool* successful) {
   if (successful != nullptr) *successful = true;

   year_t year = 0;
   month_t month = 1;
   day_t day = 1;

   if (str == nullptr || end <= str) {
      Logger::error("Invalid string start/end pointers: ", static_cast<void const*>(str), " - ", static_cast<void const*>(end));
      if (successful != nullptr) *successful = false;
      return { year, month, day };
   }

   char const* year_end = str;
   while (std::isdigit(*year_end) && ++year_end < end);

   if (year_end <= str) {
      Logger::error("Failed to find year digits in date: ", std::string_view { str, static_cast<size_t>(end - str) });
      if (successful != nullptr) *successful = false;
      return { year, month, day };
   }

   bool sub_successful = false;
   uint64_t val = StringUtils::string_to_uint64(str, year_end, &sub_successful, 10);
   if (!sub_successful || val > std::numeric_limits<year_t>::max()) {
      Logger::error("Failed to read year: ", std::string_view { str, static_cast<size_t>(end - str) });
      if (successful != nullptr) *successful = false;
      return { year, month, day };
   }
   year = val;
   if (year_end < end) {
      if (*year_end == SEPARATOR_CHARACTER) {
         char const* const month_start = year_end + 1;
         char const* month_end = month_start;
         if (month_start < end) {
            while (std::isdigit(*month_end) && ++month_end < end);
         }
         if (month_start >= month_end) {
            Logger::error("Failed to find month digits in date: ", std::string_view { str, static_cast<size_t>(end - str) });
            if (successful != nullptr) *successful = false;
         } else {
            sub_successful = false;
            val = StringUtils::string_to_uint64(month_start, month_end, &sub_successful, 10);
            if (!sub_successful || val < 1 || val > MONTHS_IN_YEAR) {
               Logger::error("Failed to read month: ", std::string_view { str, static_cast<size_t>(end - str) });
               if (successful != nullptr) *successful = false;
            } else {
               month = val;
               if (month_end < end) {
                  if (*month_end == SEPARATOR_CHARACTER) {
                     char const* const day_start = month_end + 1;
                     char const* day_end = day_start;
                     if (day_start < end) {
                        while (std::isdigit(*day_end) && ++day_end < end);
                     }
                     if (day_start >= day_end) {
                        Logger::error("Failed to find day digits in date: ", std::string_view { str, static_cast<size_t>(end - str) });
                        if (successful != nullptr) *successful = false;
                     } else {
                        sub_successful = false;
                        val = StringUtils::string_to_uint64(day_start, day_end, &sub_successful);
                        if (!sub_successful || val < 1 || val > DAYS_IN_MONTH[month - 1]) {
                           Logger::error("Failed to read day: ", std::string_view { str, static_cast<size_t>(end - str) });
                           if (successful != nullptr) *successful = false;
                        } else {
                           day = val;
                           if (day_end < end) {
                              Logger::error("Unexpected string \"", std::string_view { day_end, static_cast<size_t>(end - day_end) }, "\" at the end of date ", std::string_view { str, static_cast<size_t>(end - str) });
                              if (successful != nullptr) *successful = false;
                           }
                        }
                     }
                  } else {
                     Logger::error("Unexpected character \"", *month_end, "\" in month of date ", std::string_view { str, static_cast<size_t>(end - str) });
                     if (successful != nullptr) *successful = false;
                  }
               }
            }
         }
      } else {
         Logger::error("Unexpected character \"", *year_end, "\" in year of date ", std::string_view { str, static_cast<size_t>(end - str) });
         if (successful != nullptr) *successful = false;
      }
   }
   return { year, month, day };
};

Date Date::from_string(char const* str, size_t length, bool* successful) {
   return from_string(str, str + length, successful);
}

Date Date::from_string(std::string_view str, bool* successful) {
   return from_string(str.data(), str.length(), successful);
}