51 lines
1.7 KiB
TypeScript
51 lines
1.7 KiB
TypeScript
export interface TurnScheduleEntry {
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startMinute: number;
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tickMinutes: number;
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}
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export type TurnScheduleEntries = [TurnScheduleEntry, ...TurnScheduleEntry[]];
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export interface TurnSchedule {
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entries: TurnScheduleEntries;
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}
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const MINUTES_PER_DAY = 24 * 60;
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const toMinuteOfDay = (date: Date): number => date.getHours() * 60 + date.getMinutes();
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const normalizeEntries = (entries: TurnScheduleEntries): TurnScheduleEntries => {
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const normalized = entries
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.map((entry) => ({
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startMinute: Math.max(0, Math.min(MINUTES_PER_DAY - 1, entry.startMinute)),
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tickMinutes: Math.max(1, entry.tickMinutes),
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}))
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.sort((a, b) => a.startMinute - b.startMinute);
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return normalized as TurnScheduleEntries;
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};
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const findCurrentEntryIndex = (minuteOfDay: number, entries: TurnScheduleEntries): number => {
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for (let i = entries.length - 1; i >= 0; i -= 1) {
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const entry = entries[i];
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if (entry && entry.startMinute <= minuteOfDay) {
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return i;
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}
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}
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return -1;
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};
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const getEntryAt = (entries: TurnScheduleEntries, index: number): TurnScheduleEntry =>
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entries[Math.max(0, Math.min(entries.length - 1, index))] ?? entries[0];
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const getTickMinutesAt = (date: Date, schedule: TurnSchedule): number => {
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const entries = normalizeEntries(schedule.entries);
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const minuteOfDay = toMinuteOfDay(date);
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const index = findCurrentEntryIndex(minuteOfDay, entries);
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const entry = getEntryAt(entries, index >= 0 ? index : entries.length - 1);
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return entry.tickMinutes;
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};
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export const getNextTurnAt = (date: Date, schedule: TurnSchedule): Date => {
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return new Date(date.getTime() + getTickMinutesAt(date, schedule) * 60_000);
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};
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