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/* $Id$ */

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/** @file date.cpp Handling of dates in our native format and transforming them to something human readable. */

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#include "stdafx.h"

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#include "openttd.h"

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#include "variables.h"

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#include "settings_type.h"

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#include "network/network.h"

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#include "network/network_func.h"

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#include "currency.h"

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#include "window_func.h"

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#include "functions.h"

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#include "date_func.h"

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#include "vehicle_base.h"

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#include "debug.h"

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#include "rail_gui.h"

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#ifdef DEBUG_DUMP_COMMANDS

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#include "saveload.h"

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#endif

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Year      _cur_year;

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Month     _cur_month;

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Date      _date;

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DateFract _date_fract;

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void SetDate(Date date)

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{

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	YearMonthDay ymd;

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	_date = date;

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	ConvertDateToYMD(date, &ymd);

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	_cur_year = ymd.year;

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	_cur_month = ymd.month;

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}

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#define M(a, b) ((a << 5) | b)

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static const uint16 _month_date_from_year_day[] = {

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	M( 0, 1), M( 0, 2), M( 0, 3), M( 0, 4), M( 0, 5), M( 0, 6), M( 0, 7), M( 0, 8), M( 0, 9), M( 0, 10), M( 0, 11), M( 0, 12), M( 0, 13), M( 0, 14), M( 0, 15), M( 0, 16), M( 0, 17), M( 0, 18), M( 0, 19), M( 0, 20), M( 0, 21), M( 0, 22), M( 0, 23), M( 0, 24), M( 0, 25), M( 0, 26), M( 0, 27), M( 0, 28), M( 0, 29), M( 0, 30), M( 0, 31),

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	M( 1, 1), M( 1, 2), M( 1, 3), M( 1, 4), M( 1, 5), M( 1, 6), M( 1, 7), M( 1, 8), M( 1, 9), M( 1, 10), M( 1, 11), M( 1, 12), M( 1, 13), M( 1, 14), M( 1, 15), M( 1, 16), M( 1, 17), M( 1, 18), M( 1, 19), M( 1, 20), M( 1, 21), M( 1, 22), M( 1, 23), M( 1, 24), M( 1, 25), M( 1, 26), M( 1, 27), M( 1, 28), M( 1, 29),

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	M( 2, 1), M( 2, 2), M( 2, 3), M( 2, 4), M( 2, 5), M( 2, 6), M( 2, 7), M( 2, 8), M( 2, 9), M( 2, 10), M( 2, 11), M( 2, 12), M( 2, 13), M( 2, 14), M( 2, 15), M( 2, 16), M( 2, 17), M( 2, 18), M( 2, 19), M( 2, 20), M( 2, 21), M( 2, 22), M( 2, 23), M( 2, 24), M( 2, 25), M( 2, 26), M( 2, 27), M( 2, 28), M( 2, 29), M( 2, 30), M( 2, 31),

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	M( 3, 1), M( 3, 2), M( 3, 3), M( 3, 4), M( 3, 5), M( 3, 6), M( 3, 7), M( 3, 8), M( 3, 9), M( 3, 10), M( 3, 11), M( 3, 12), M( 3, 13), M( 3, 14), M( 3, 15), M( 3, 16), M( 3, 17), M( 3, 18), M( 3, 19), M( 3, 20), M( 3, 21), M( 3, 22), M( 3, 23), M( 3, 24), M( 3, 25), M( 3, 26), M( 3, 27), M( 3, 28), M( 3, 29), M( 3, 30),

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	M( 4, 1), M( 4, 2), M( 4, 3), M( 4, 4), M( 4, 5), M( 4, 6), M( 4, 7), M( 4, 8), M( 4, 9), M( 4, 10), M( 4, 11), M( 4, 12), M( 4, 13), M( 4, 14), M( 4, 15), M( 4, 16), M( 4, 17), M( 4, 18), M( 4, 19), M( 4, 20), M( 4, 21), M( 4, 22), M( 4, 23), M( 4, 24), M( 4, 25), M( 4, 26), M( 4, 27), M( 4, 28), M( 4, 29), M( 4, 30), M( 4, 31),

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	M( 5, 1), M( 5, 2), M( 5, 3), M( 5, 4), M( 5, 5), M( 5, 6), M( 5, 7), M( 5, 8), M( 5, 9), M( 5, 10), M( 5, 11), M( 5, 12), M( 5, 13), M( 5, 14), M( 5, 15), M( 5, 16), M( 5, 17), M( 5, 18), M( 5, 19), M( 5, 20), M( 5, 21), M( 5, 22), M( 5, 23), M( 5, 24), M( 5, 25), M( 5, 26), M( 5, 27), M( 5, 28), M( 5, 29), M( 5, 30),

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	M( 6, 1), M( 6, 2), M( 6, 3), M( 6, 4), M( 6, 5), M( 6, 6), M( 6, 7), M( 6, 8), M( 6, 9), M( 6, 10), M( 6, 11), M( 6, 12), M( 6, 13), M( 6, 14), M( 6, 15), M( 6, 16), M( 6, 17), M( 6, 18), M( 6, 19), M( 6, 20), M( 6, 21), M( 6, 22), M( 6, 23), M( 6, 24), M( 6, 25), M( 6, 26), M( 6, 27), M( 6, 28), M( 6, 29), M( 6, 30), M( 6, 31),

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	M( 7, 1), M( 7, 2), M( 7, 3), M( 7, 4), M( 7, 5), M( 7, 6), M( 7, 7), M( 7, 8), M( 7, 9), M( 7, 10), M( 7, 11), M( 7, 12), M( 7, 13), M( 7, 14), M( 7, 15), M( 7, 16), M( 7, 17), M( 7, 18), M( 7, 19), M( 7, 20), M( 7, 21), M( 7, 22), M( 7, 23), M( 7, 24), M( 7, 25), M( 7, 26), M( 7, 27), M( 7, 28), M( 7, 29), M( 7, 30), M( 7, 31),

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	M( 8, 1), M( 8, 2), M( 8, 3), M( 8, 4), M( 8, 5), M( 8, 6), M( 8, 7), M( 8, 8), M( 8, 9), M( 8, 10), M( 8, 11), M( 8, 12), M( 8, 13), M( 8, 14), M( 8, 15), M( 8, 16), M( 8, 17), M( 8, 18), M( 8, 19), M( 8, 20), M( 8, 21), M( 8, 22), M( 8, 23), M( 8, 24), M( 8, 25), M( 8, 26), M( 8, 27), M( 8, 28), M( 8, 29), M( 8, 30),

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	M( 9, 1), M( 9, 2), M( 9, 3), M( 9, 4), M( 9, 5), M( 9, 6), M( 9, 7), M( 9, 8), M( 9, 9), M( 9, 10), M( 9, 11), M( 9, 12), M( 9, 13), M( 9, 14), M( 9, 15), M( 9, 16), M( 9, 17), M( 9, 18), M( 9, 19), M( 9, 20), M( 9, 21), M( 9, 22), M( 9, 23), M( 9, 24), M( 9, 25), M( 9, 26), M( 9, 27), M( 9, 28), M( 9, 29), M( 9, 30), M( 9, 31),

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	M(10, 1), M(10, 2), M(10, 3), M(10, 4), M(10, 5), M(10, 6), M(10, 7), M(10, 8), M(10, 9), M(10, 10), M(10, 11), M(10, 12), M(10, 13), M(10, 14), M(10, 15), M(10, 16), M(10, 17), M(10, 18), M(10, 19), M(10, 20), M(10, 21), M(10, 22), M(10, 23), M(10, 24), M(10, 25), M(10, 26), M(10, 27), M(10, 28), M(10, 29), M(10, 30),

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	M(11, 1), M(11, 2), M(11, 3), M(11, 4), M(11, 5), M(11, 6), M(11, 7), M(11, 8), M(11, 9), M(11, 10), M(11, 11), M(11, 12), M(11, 13), M(11, 14), M(11, 15), M(11, 16), M(11, 17), M(11, 18), M(11, 19), M(11, 20), M(11, 21), M(11, 22), M(11, 23), M(11, 24), M(11, 25), M(11, 26), M(11, 27), M(11, 28), M(11, 29), M(11, 30), M(11, 31),

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};

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#undef M

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enum {

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	ACCUM_JAN = 0,

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	ACCUM_FEB = ACCUM_JAN + 31,

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	ACCUM_MAR = ACCUM_FEB + 29,

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	ACCUM_APR = ACCUM_MAR + 31,

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	ACCUM_MAY = ACCUM_APR + 30,

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	ACCUM_JUN = ACCUM_MAY + 31,

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	ACCUM_JUL = ACCUM_JUN + 30,

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	ACCUM_AUG = ACCUM_JUL + 31,

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	ACCUM_SEP = ACCUM_AUG + 31,

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	ACCUM_OCT = ACCUM_SEP + 30,

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	ACCUM_NOV = ACCUM_OCT + 31,

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	ACCUM_DEC = ACCUM_NOV + 30,

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};

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static const uint16 _accum_days_for_month[] = {

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	ACCUM_JAN, ACCUM_FEB, ACCUM_MAR, ACCUM_APR,

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	ACCUM_MAY, ACCUM_JUN, ACCUM_JUL, ACCUM_AUG,

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	ACCUM_SEP, ACCUM_OCT, ACCUM_NOV, ACCUM_DEC,

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};

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/**

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 * Converts a Date to a Year, Month & Day.

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 * @param date the date to convert from

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 * @param ymd  the year, month and day to write to

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 */

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void ConvertDateToYMD(Date date, YearMonthDay *ymd)

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{

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	/*

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	 * Year determination in multiple steps to account for leap

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	 * years. First do the large steps, then the smaller ones.

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	 */

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	/* There are 97 leap years in 400 years */

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	Year yr = 400 * (date / (365 * 400 + 97));

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	int rem = date % (365 * 400 + 97);

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	uint16 x;

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	if (rem >= 365 * 100 + 25) {

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		/* There are 25 leap years in the first 100 years after

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		 * every 400th year, as every 400th year is a leap year */

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		yr  += 100;

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		rem -= 365 * 100 + 25;

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		/* There are 24 leap years in the next couple of 100 years */

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		yr += 100 * (rem / (365 * 100 + 24));

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		rem = (rem % (365 * 100 + 24));

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	}

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	if (!IsLeapYear(yr) && rem >= 365 * 4) {

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		/* The first 4 year of the century are not always a leap year */

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		yr  += 4;

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		rem -= 365 * 4;

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	}

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	/* There is 1 leap year every 4 years */

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	yr += 4 * (rem / (365 * 4 + 1));

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	rem = rem % (365 * 4 + 1);

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	/* The last (max 3) years to account for; the first one

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	 * can be, but is not necessarily a leap year */

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	while (rem >= (IsLeapYear(yr) ? 366 : 365)) {

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		rem -= IsLeapYear(yr) ? 366 : 365;

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		yr++;

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	}

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	/* Skip the 29th of February in non-leap years */

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	if (!IsLeapYear(yr) && rem >= ACCUM_MAR - 1) rem++;

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	ymd->year = yr;

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	x = _month_date_from_year_day[rem];

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	ymd->month = x >> 5;

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	ymd->day = x & 0x1F;

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}

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/**

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 * Converts a tupe of Year, Month and Day to a Date.

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 * @param year  is a number between 0..MAX_YEAR

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 * @param month is a number between 0..11

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 * @param day   is a number between 1..31

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 */

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Date ConvertYMDToDate(Year year, Month month, Day day)

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{

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	/*

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	 * Each passed leap year adds one day to the 'day count'.

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	 *

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	 * A special case for the year 0 as no year has been passed,

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	 * but '(year - 1) / 4' does not yield '-1' to counteract the

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	 * '+1' at the end of the formula as divisions round to zero.

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	 */

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	int nr_of_leap_years = (year == 0) ? 0 : ((year - 1) / 4 - (year - 1) / 100 + (year - 1) / 400 + 1);

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	/* Day-offset in a leap year */

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	int days = _accum_days_for_month[month] + day - 1;

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	/* Account for the missing of the 29th of February in non-leap years */

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	if (!IsLeapYear(year) && days >= ACCUM_MAR) days--;

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	return year * 365 + nr_of_leap_years + days;

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}

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/** Functions used by the IncreaseDate function */

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extern void WaypointsDailyLoop();

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extern void EnginesDailyLoop();

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extern void DisasterDailyLoop();

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extern void IndustryDailyLoop();

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extern void CompaniesMonthlyLoop();

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extern void EnginesMonthlyLoop();

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extern void TownsMonthlyLoop();

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extern void IndustryMonthlyLoop();

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extern void StationMonthlyLoop();

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extern void CompaniesYearlyLoop();

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extern void TrainsYearlyLoop();

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extern void RoadVehiclesYearlyLoop();

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extern void AircraftYearlyLoop();

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extern void ShipsYearlyLoop();

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extern void TownsYearlyLoop();

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extern void ShowEndGameChart();

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static const Month _autosave_months[] = {

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	 0, ///< never

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	 1, ///< every month

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	 3, ///< every 3 months

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	 6, ///< every 6 months

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	12, ///< every 12 months

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};

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/**

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 * Runs the day_proc for every DAY_TICKS vehicle starting at daytick.

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 */

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static void RunVehicleDayProc(uint daytick)

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{

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	uint total = GetMaxVehicleIndex() + 1;

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	uint i;

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	for (i = daytick; i < total; i += DAY_TICKS) {

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		Vehicle *v = GetVehicle(i);

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		if (v->IsValid()) {

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			/* Call the 32-day callback if needed */

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			CheckVehicle32Day(v);

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			v->OnNewDay();

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		}

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	}

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}

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void IncreaseDate()

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{

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	YearMonthDay ymd;

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	if (_game_mode == GM_MENU) {

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		_tick_counter++;

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		return;

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	}

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	RunVehicleDayProc(_date_fract);

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	/* increase day, and check if a new day is there? */

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	_tick_counter++;

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	_date_fract++;

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	if (_date_fract < DAY_TICKS) return;

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	_date_fract = 0;

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	/* yeah, increase day counter and call various daily loops */

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	_date++;

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#ifdef ENABLE_NETWORK

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	NetworkChatMessageDailyLoop();

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#endif /* ENABLE_NETWORK */

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	DisasterDailyLoop();

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	WaypointsDailyLoop();

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	IndustryDailyLoop();

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	if (_game_mode != GM_MENU) {

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		InvalidateWindowWidget(WC_STATUS_BAR, 0, 0);

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		EnginesDailyLoop();

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	}

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	/* check if we entered a new month? */

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	ConvertDateToYMD(_date, &ymd);

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	if (ymd.month == _cur_month) return;

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	_cur_month = ymd.month;

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	/* yes, call various monthly loops */

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	if (_game_mode != GM_MENU) {

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#ifdef DEBUG_DUMP_COMMANDS

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		char name[MAX_PATH];

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		snprintf(name, lengthof(name), "dmp_cmds_%d.sav", _date);

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		SaveOrLoad(name, SL_SAVE, AUTOSAVE_DIR);

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		DebugDumpCommands("ddc:save:%s\n", name);

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#endif /* DUMP_COMMANDS */

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		if (_settings_client.gui.autosave != 0 && (_cur_month % _autosave_months[_settings_client.gui.autosave]) == 0) {

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			_do_autosave = true;

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			RedrawAutosave();

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		}

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		InvalidateWindowClasses(WC_CHEATS);

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		CompaniesMonthlyLoop();

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		EnginesMonthlyLoop();

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		TownsMonthlyLoop();

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		IndustryMonthlyLoop();

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		StationMonthlyLoop();

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#ifdef ENABLE_NETWORK

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		if (_network_server) NetworkServerMonthlyLoop();

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#endif /* ENABLE_NETWORK */

   267

	}

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	/* check if we entered a new year? */

   270

	if (ymd.year == _cur_year) return;

   271

	_cur_year = ymd.year;

   272

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	/* yes, call various yearly loops */

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	CompaniesYearlyLoop();

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	TrainsYearlyLoop();

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	RoadVehiclesYearlyLoop();

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	AircraftYearlyLoop();

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	ShipsYearlyLoop();

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	TownsYearlyLoop();

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#ifdef ENABLE_NETWORK

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	if (_network_server) NetworkServerYearlyLoop();

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#endif /* ENABLE_NETWORK */

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	if (_cur_year == _settings_client.gui.semaphore_build_before) ResetSignalVariant();

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	/* check if we reached end of the game */

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	if (_cur_year == _settings_client.gui.ending_year) {

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			ShowEndGameChart();

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	/* check if we reached the maximum year, decrement dates by a year */

   290

	} else if (_cur_year == MAX_YEAR + 1) {

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		Vehicle *v;

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		uint days_this_year;

   293

   294

		_cur_year--;

   295

		days_this_year = IsLeapYear(_cur_year) ? 366 : 365;

   296

		_date -= days_this_year;

   297

		FOR_ALL_VEHICLES(v) v->date_of_last_service -= days_this_year;

   298

   299

#ifdef ENABLE_NETWORK

   300

		/* Because the _date wraps here, and text-messages expire by game-days, we have to clean out

   301

		 *  all of them if the date is set back, else those messages will hang for ever */

   302

		NetworkInitChatMessage();

   303

#endif /* ENABLE_NETWORK */

   304

	}

   305

   306

	if (_settings_client.gui.auto_euro) CheckSwitchToEuro();

   307

}