summaryrefslogtreecommitdiff
path: root/src/date.cpp
blob: 9122b21c887cf575a093cbaf24847ad636152ae7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
/* $Id$ */

/*
 * 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 <http://www.gnu.org/licenses/>.
 */

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

#include "stdafx.h"
#include "variables.h"
#include "network/network.h"
#include "network/network_func.h"
#include "currency.h"
#include "window_func.h"
#include "functions.h"
#include "date_func.h"
#include "vehicle_base.h"
#include "debug.h"
#include "rail_gui.h"
#include "saveload/saveload.h"

Year      _cur_year;   ///< Current year, starting at 0
Month     _cur_month;  ///< Current month (0..11)
Date      _date;       ///< Current date in days (day counter)
DateFract _date_fract;


void SetDate(Date date)
{
	YearMonthDay ymd;

	_date = date;
	ConvertDateToYMD(date, &ymd);
	_cur_year = ymd.year;
	_cur_month = ymd.month;
}

#define M(a, b) ((a << 5) | b)
static const uint16 _month_date_from_year_day[] = {
	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),
	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),
	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),
	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),
	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),
	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),
	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),
	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),
	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),
	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),
	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),
	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),
};
#undef M

enum {
	ACCUM_JAN = 0,
	ACCUM_FEB = ACCUM_JAN + 31,
	ACCUM_MAR = ACCUM_FEB + 29,
	ACCUM_APR = ACCUM_MAR + 31,
	ACCUM_MAY = ACCUM_APR + 30,
	ACCUM_JUN = ACCUM_MAY + 31,
	ACCUM_JUL = ACCUM_JUN + 30,
	ACCUM_AUG = ACCUM_JUL + 31,
	ACCUM_SEP = ACCUM_AUG + 31,
	ACCUM_OCT = ACCUM_SEP + 30,
	ACCUM_NOV = ACCUM_OCT + 31,
	ACCUM_DEC = ACCUM_NOV + 30,
};

static const uint16 _accum_days_for_month[] = {
	ACCUM_JAN, ACCUM_FEB, ACCUM_MAR, ACCUM_APR,
	ACCUM_MAY, ACCUM_JUN, ACCUM_JUL, ACCUM_AUG,
	ACCUM_SEP, ACCUM_OCT, ACCUM_NOV, ACCUM_DEC,
};

/**
 * Converts a Date to a Year, Month & Day.
 * @param date the date to convert from
 * @param ymd  the year, month and day to write to
 */
void ConvertDateToYMD(Date date, YearMonthDay *ymd)
{
	/*
	 * Year determination in multiple steps to account for leap
	 * years. First do the large steps, then the smaller ones.
	 */

	/* There are 97 leap years in 400 years */
	Year yr = 400 * (date / (DAYS_IN_YEAR * 400 + 97));
	int rem = date % (DAYS_IN_YEAR * 400 + 97);
	uint16 x;

	if (rem >= DAYS_IN_YEAR * 100 + 25) {
		/* There are 25 leap years in the first 100 years after
		 * every 400th year, as every 400th year is a leap year */
		yr  += 100;
		rem -= DAYS_IN_YEAR * 100 + 25;

		/* There are 24 leap years in the next couple of 100 years */
		yr += 100 * (rem / (DAYS_IN_YEAR * 100 + 24));
		rem = (rem % (DAYS_IN_YEAR * 100 + 24));
	}

	if (!IsLeapYear(yr) && rem >= DAYS_IN_YEAR * 4) {
		/* The first 4 year of the century are not always a leap year */
		yr  += 4;
		rem -= DAYS_IN_YEAR * 4;
	}

	/* There is 1 leap year every 4 years */
	yr += 4 * (rem / (DAYS_IN_YEAR * 4 + 1));
	rem = rem % (DAYS_IN_YEAR * 4 + 1);

	/* The last (max 3) years to account for; the first one
	 * can be, but is not necessarily a leap year */
	while (rem >= (IsLeapYear(yr) ? DAYS_IN_LEAP_YEAR : DAYS_IN_YEAR)) {
		rem -= IsLeapYear(yr) ? DAYS_IN_LEAP_YEAR : DAYS_IN_YEAR;
		yr++;
	}

	/* Skip the 29th of February in non-leap years */
	if (!IsLeapYear(yr) && rem >= ACCUM_MAR - 1) rem++;

	ymd->year = yr;

	x = _month_date_from_year_day[rem];
	ymd->month = x >> 5;
	ymd->day = x & 0x1F;
}

/**
 * Converts a tupe of Year, Month and Day to a Date.
 * @param year  is a number between 0..MAX_YEAR
 * @param month is a number between 0..11
 * @param day   is a number between 1..31
 */
Date ConvertYMDToDate(Year year, Month month, Day day)
{
	/* Day-offset in a leap year */
	int days = _accum_days_for_month[month] + day - 1;

	/* Account for the missing of the 29th of February in non-leap years */
	if (!IsLeapYear(year) && days >= ACCUM_MAR) days--;

	return DAYS_TILL(year) + days;
}

/** Functions used by the IncreaseDate function */

extern void EnginesDailyLoop();
extern void DisasterDailyLoop();
extern void IndustryDailyLoop();
extern void CompaniesMonthlyLoop();
extern void EnginesMonthlyLoop();
extern void TownsMonthlyLoop();
extern void IndustryMonthlyLoop();
extern void StationMonthlyLoop();
extern void SubsidyMonthlyLoop();

extern void CompaniesYearlyLoop();
extern void VehiclesYearlyLoop();
extern void TownsYearlyLoop();

extern void ShowEndGameChart();


static const Month _autosave_months[] = {
	 0, ///< never
	 1, ///< every month
	 3, ///< every 3 months
	 6, ///< every 6 months
	12, ///< every 12 months
};

/**
 * Runs various procedures that have to be done yearly
 */
static void OnNewYear()
{
	CompaniesYearlyLoop();
	VehiclesYearlyLoop();
	TownsYearlyLoop();
	InvalidateWindowClassesData(WC_BUILD_STATION);
#ifdef ENABLE_NETWORK
	if (_network_server) NetworkServerYearlyLoop();
#endif /* ENABLE_NETWORK */

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

	/* check if we reached end of the game */
	if (_cur_year == ORIGINAL_END_YEAR) {
		ShowEndGameChart();
	/* check if we reached the maximum year, decrement dates by a year */
	} else if (_cur_year == MAX_YEAR + 1) {
		Vehicle *v;
		uint days_this_year;

		_cur_year--;
		days_this_year = IsLeapYear(_cur_year) ? DAYS_IN_LEAP_YEAR : DAYS_IN_YEAR;
		_date -= days_this_year;
		FOR_ALL_VEHICLES(v) v->date_of_last_service -= days_this_year;

#ifdef ENABLE_NETWORK
		/* Because the _date wraps here, and text-messages expire by game-days, we have to clean out
		 *  all of them if the date is set back, else those messages will hang for ever */
		NetworkInitChatMessage();
#endif /* ENABLE_NETWORK */
	}

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

/**
 * Runs various procedures that have to be done monthly
 */
static void OnNewMonth()
{
	if (_debug_desync_level > 2) {
		char name[MAX_PATH];
		snprintf(name, lengthof(name), "dmp_cmds_%08x_%08x.sav", _settings_game.game_creation.generation_seed, _date);
		SaveOrLoad(name, SL_SAVE, AUTOSAVE_DIR);
	}

	if (_settings_client.gui.autosave != 0 && (_cur_month % _autosave_months[_settings_client.gui.autosave]) == 0) {
		_do_autosave = true;
		RedrawAutosave();
	}

	SetWindowClassesDirty(WC_CHEATS);
	CompaniesMonthlyLoop();
	SubsidyMonthlyLoop();
	EnginesMonthlyLoop();
	TownsMonthlyLoop();
	IndustryMonthlyLoop();
	StationMonthlyLoop();
#ifdef ENABLE_NETWORK
	if (_network_server) NetworkServerMonthlyLoop();
#endif /* ENABLE_NETWORK */
}

/**
 * Runs various procedures that have to be done daily
 */
static void OnNewDay()
{
#ifdef ENABLE_NETWORK
	NetworkChatMessageDailyLoop();
#endif /* ENABLE_NETWORK */

	DisasterDailyLoop();
	IndustryDailyLoop();

	SetWindowWidgetDirty(WC_STATUS_BAR, 0, 0);
	EnginesDailyLoop();

	/* Refresh after possible snowline change */
	SetWindowClassesDirty(WC_TOWN_VIEW);
}

/**
 * Increases the tick counter, increases date  and possibly calls
 * procedures that have to be called daily, monthly or yearly.
 */
void IncreaseDate()
{
	/* increase day, and check if a new day is there? */
	_tick_counter++;

	if (_game_mode == GM_MENU) return;

	_date_fract++;
	if (_date_fract < DAY_TICKS) return;
	_date_fract = 0;

	/* increase day counter and call various daily loops */
	_date++;
	OnNewDay();

	YearMonthDay ymd;

	/* check if we entered a new month? */
	ConvertDateToYMD(_date, &ymd);
	if (ymd.month == _cur_month) return;

	/* yes, call various monthly loops */
	_cur_month = ymd.month;
	OnNewMonth();

	/* check if we entered a new year? */
	if (ymd.year == _cur_year) return;

	/* yes, call various yearly loops */
	_cur_year = ymd.year;
	OnNewYear();
}