timer_game_calendar.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */
 
#include "../stdafx.h"
#include "../openttd.h"
#include "timer.h"
#include "timer_game_calendar.h"
#include "../vehicle_base.h"
 
#include "../safeguards.h"
 
TimerGameCalendar::Year TimerGameCalendar::year = {};
TimerGameCalendar::Month TimerGameCalendar::month = {};
TimerGameCalendar::Date TimerGameCalendar::date = {};
TimerGameCalendar::DateFract TimerGameCalendar::date_fract = {};
uint16_t TimerGameCalendar::sub_date_fract = {};
 
/* static */ TimerGameCalendar::YearMonthDay TimerGameCalendar::ConvertDateToYMD(TimerGameCalendar::Date date)
{
  /* This wrapper function only exists because economy time sometimes does things differently, when using wallclock units. */
  return CalendarConvertDateToYMD(date);
}
 
/* static */ TimerGameCalendar::Date TimerGameCalendar::ConvertYMDToDate(TimerGameCalendar::Year year, TimerGameCalendar::Month month, TimerGameCalendar::Day day)
{
  /* This wrapper function only exists because economy time sometimes does things differently, when using wallclock units. */
  return CalendarConvertYMDToDate(year, month, day);
}
 
/* static */ void TimerGameCalendar::SetDate(TimerGameCalendar::Date date, TimerGameCalendar::DateFract fract)
{
  assert(fract < Ticks::DAY_TICKS);
 
  TimerGameCalendar::date = date;
  TimerGameCalendar::date_fract = fract;
  TimerGameCalendar::YearMonthDay ymd = TimerGameCalendar::ConvertDateToYMD(date);
  TimerGameCalendar::year = TimerGameCalendar::Year{ymd.year};
  TimerGameCalendar::month = ymd.month;
}
 
template <>
void IntervalTimer<TimerGameCalendar>::Elapsed(TimerGameCalendar::TElapsed trigger)
{
  if (trigger == this->period.trigger) {
    this->callback(1);
  }
}
 
template <>
void TimeoutTimer<TimerGameCalendar>::Elapsed(TimerGameCalendar::TElapsed trigger)
{
  if (this->fired) return;
 
  if (trigger == this->period.trigger) {
    this->callback();
    this->fired = true;
  }
}
 
template <>
bool TimerManager<TimerGameCalendar>::Elapsed([[maybe_unused]] TimerGameCalendar::TElapsed delta)
{
  assert(delta == 1);
 
  if (_game_mode == GM_MENU) return false;
 
  /* If calendar day progress is frozen, don't try to advance time. */
  if (_settings_game.economy.minutes_per_calendar_year == CalendarTime::FROZEN_MINUTES_PER_YEAR) return false;
 
  /* If we are using a non-default calendar progression speed, we need to check the sub_date_fract before updating date_fract. */
  if (_settings_game.economy.minutes_per_calendar_year != CalendarTime::DEF_MINUTES_PER_YEAR) {
    TimerGameCalendar::sub_date_fract += Ticks::DAY_TICKS;
 
    /* Check if we are ready to increment date_fract */
    const uint16_t threshold = (_settings_game.economy.minutes_per_calendar_year * Ticks::DAY_TICKS) / CalendarTime::DEF_MINUTES_PER_YEAR;
    if (TimerGameCalendar::sub_date_fract < threshold) return false;
 
    TimerGameCalendar::sub_date_fract = std::min<uint16_t>(TimerGameCalendar::sub_date_fract - threshold, Ticks::DAY_TICKS - 1);
  }
 
  TimerGameCalendar::date_fract++;
 
  /* Check if we entered a new day. */
  if (TimerGameCalendar::date_fract < Ticks::DAY_TICKS) return true;
  TimerGameCalendar::date_fract = 0;
  TimerGameCalendar::sub_date_fract = 0;
 
  /* Increase day counter. */
  TimerGameCalendar::date++;
 
  TimerGameCalendar::YearMonthDay ymd = TimerGameCalendar::ConvertDateToYMD(TimerGameCalendar::date);
 
  /* Check if we entered a new month. */
  bool new_month = ymd.month != TimerGameCalendar::month;
 
  /* Check if we entered a new year. */
  bool new_year = ymd.year != TimerGameCalendar::year;
 
  /* Update internal variables before calling the daily/monthly/yearly loops. */
  TimerGameCalendar::month = ymd.month;
  TimerGameCalendar::year = ymd.year;
 
  /* Make a temporary copy of the timers, as a timer's callback might add/remove other timers. */
  auto timers = TimerManager<TimerGameCalendar>::GetTimers();
 
  for (auto timer : timers) {
    timer->Elapsed(TimerGameCalendar::DAY);
  }
 
  if (new_month) {
    for (auto timer : timers) {
      timer->Elapsed(TimerGameCalendar::MONTH);
    }
  }
 
  if (new_year) {
    for (auto timer : timers) {
      timer->Elapsed(TimerGameCalendar::YEAR);
    }
  }
 
  /* If we reached the maximum year, decrement dates by a year. */
  if (TimerGameCalendar::year == CalendarTime::MAX_YEAR + 1) {
    TimerGameCalendar::year--;
    TimerGameCalendar::Date days_this_year{TimerGameCalendar::IsLeapYear(TimerGameCalendar::year) ? CalendarTime::DAYS_IN_LEAP_YEAR : CalendarTime::DAYS_IN_YEAR};
    TimerGameCalendar::date -= days_this_year;
  }
 
  return true;
}
 
#ifdef WITH_ASSERT
template <>
void TimerManager<TimerGameCalendar>::Validate(TimerGameCalendar::TPeriod period)
{
  if (period.priority == TimerGameCalendar::Priority::NONE) return;
 
  /* Validate we didn't make a developer error and scheduled more than one
   * entry on the same priority/trigger. There can only be one timer on
   * a specific trigger/priority, to ensure we are deterministic. */
  for (const auto &timer : TimerManager<TimerGameCalendar>::GetTimers()) {
    if (timer->period.trigger != period.trigger) continue;
 
    assert(timer->period.priority != period.priority);
  }
}
#endif /* WITH_ASSERT */