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// CRITICAL: getnow() returns the session's pinned datetime, never wall clock.
// This ensures phase_of_the_moon() and friday_13th() are deterministic.
// See LORE Lesson #7 and DECISIONS.md.
import { game } from './gstate.js';
// C ref: calendar.c:31 getnow()
// Returns the pinned session datetime (from NETHACK_FIXED_DATETIME env var).
// The C version reads the env var in a patched getnow(); we store the
// pinned time in game.fixed_datetime.
export function getnow() {
if (game && game.fixed_datetime) {
return game.fixed_datetime;
}
return new Date();
}
// Convert a "yyyymmddhhmmss" string to a Date object.
// C ref: calendar.c:119 time_from_yyyymmddhhmmss()
export function time_from_yyyymmddhhmmss(buf) {
if (!buf || buf.length !== 14) return null;
const y = parseInt(buf.slice(0, 4));
const mo = parseInt(buf.slice(4, 6)) - 1; // JS months are 0-based
const d = parseInt(buf.slice(6, 8));
const h = parseInt(buf.slice(8, 10));
const mi = parseInt(buf.slice(10, 12));
const s = parseInt(buf.slice(12, 14));
const parsed = new Date(y, mo, d, h, mi, s);
// C harness patch seeds struct tm from localtime(now), preserving tm_isdst
// before overriding Y/M/D/H/M/S. Reproduce that mktime quirk here.
const now = new Date();
const janOffset = new Date(now.getFullYear(), 0, 1).getTimezoneOffset();
const julOffset = new Date(now.getFullYear(), 6, 1).getTimezoneOffset();
const stdOffset = Math.max(janOffset, julOffset);
const nowDst = now.getTimezoneOffset() < stdOffset ? 1 : 0;
const parsedDst = parsed.getTimezoneOffset() < stdOffset ? 1 : 0;
if (nowDst !== parsedDst) {
return new Date(parsed.getTime() - ((nowDst - parsedDst) * 3600 * 1000));
}
return parsed;
}
// Get local time struct equivalent from getnow().
// Returns a Date object (JS equivalent of struct tm *).
function getlt() {
const dt = getnow();
return dt instanceof Date ? dt : new Date(dt);
}
// C ref: calendar.c:48 getyear()
export function getyear() {
return getlt().getFullYear();
}
// C ref: calendar.c:55 yyyymmdd()
export function yyyymmdd(date) {
const lt = date ? new Date(date) : getlt();
let datenum = lt.getFullYear();
datenum = datenum * 100 + (lt.getMonth() + 1);
datenum = datenum * 100 + lt.getDate();
return datenum;
}
// C ref: calendar.c:79 hhmmss()
export function hhmmss(date) {
const lt = date ? new Date(date) : getlt();
return lt.getHours() * 10000 + lt.getMinutes() * 100 + lt.getSeconds();
}
// C ref: calendar.c:94 yyyymmddhhmmss()
export function yyyymmddhhmmss(date) {
const lt = date ? new Date(date) : getlt();
const y = lt.getFullYear();
const mo = String(lt.getMonth() + 1).padStart(2, '0');
const d = String(lt.getDate()).padStart(2, '0');
const h = String(lt.getHours()).padStart(2, '0');
const mi = String(lt.getMinutes()).padStart(2, '0');
const s = String(lt.getSeconds()).padStart(2, '0');
return `${y}${mo}${d}${h}${mi}${s}`;
}
// C ref: calendar.c:190 phase_of_the_moon()
// Returns 0-7: 0=new moon, 4=full moon
export function phase_of_the_moon() {
const lt = getlt();
const diy = Math.floor(
(lt - new Date(lt.getFullYear(), 0, 1)) / (1000 * 60 * 60 * 24)
); // day of year (0-based)
const goldn = (lt.getFullYear() % 19) + 1;
let epact = (11 * goldn + 18) % 30;
if ((epact === 25 && goldn > 11) || epact === 24)
epact++;
return ((((((diy + epact) * 6) + 11) % 177) / 22) & 7) | 0;
}
// C ref: calendar.c:205 friday_13th()
export function friday_13th() {
const lt = getlt();
// getDay(): 0=Sunday, 5=Friday
return lt.getDay() === 5 && lt.getDate() === 13;
}
// C ref: calendar.c:214 night()
export function night() {
const hour = getlt().getHours();
return hour < 6 || hour > 21;
}
// C ref: calendar.c:222 midnight()
export function midnight() {
return getlt().getHours() === 0;
}
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