63 lines
1.4 KiB
TypeScript
63 lines
1.4 KiB
TypeScript
 
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export type CheckRassInput = {
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amount: number;
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dueDate: Date | string;
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};
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export type CheckRassResult = {
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checkCount: number;
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totalAmount: number;
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nearestDueDate: string | null;
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farthestDueDate: string | null;
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rassDays: number;
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rassDate: string | null;
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};
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import {
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addDays,
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calendarDayOf,
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diffInDays,
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tehranCalendarDay,
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} from './tehran-time';
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export function calculateCheckRass(
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checks: CheckRassInput[],
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baseDate: Date = new Date(),
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): CheckRassResult {
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if (checks.length === 0) {
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return {
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checkCount: 0,
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totalAmount: 0,
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nearestDueDate: null,
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farthestDueDate: null,
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rassDays: 0,
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rassDate: null,
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};
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}
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const base = tehranCalendarDay(baseDate);
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let totalAmount = 0;
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let weightedDays = 0;
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const dueDates: Date[] = [];
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for (const check of checks) {
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const due = calendarDayOf(check.dueDate);
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dueDates.push(due);
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const days = Math.max(0, diffInDays(base, due));
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totalAmount += check.amount;
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weightedDays += check.amount * days;
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}
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const rassDays = totalAmount > 0 ? Math.round(weightedDays / totalAmount) : 0;
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const rassDate = addDays(base, rassDays);
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dueDates.sort((a, b) => a.getTime() - b.getTime());
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return {
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checkCount: checks.length,
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totalAmount,
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nearestDueDate: dueDates[0]?.toISOString() ?? null,
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farthestDueDate: dueDates[dueDates.length - 1]?.toISOString() ?? null,
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rassDays,
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rassDate: rassDate.toISOString(),
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};
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}
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