/**
 * Date utilities for effective date logic and rolling windows
 */

import { addDays, isAfter, isBefore, isWithinInterval, subDays } from 'date-fns';

export function isEffectiveDate(date: Date, effectiveDate: Date, expiryDate?: Date): boolean {
  if (isBefore(date, effectiveDate)) {
    return false;
  }
  if (expiryDate && isAfter(date, expiryDate)) {
    return false;
  }
  return true;
}

export interface RollingWindow {
  startDate: Date;
  endDate: Date;
  days: number;
}

export function calculateRollingWindow(
  referenceDate: Date,
  windowDays: number
): RollingWindow {
  const startDate = subDays(referenceDate, windowDays);
  return {
    startDate,
    endDate: referenceDate,
    days: windowDays,
  };
}

export function isWithinRollingWindow(
  date: Date,
  window: RollingWindow
): boolean {
  return isWithinInterval(date, {
    start: window.startDate,
    end: window.endDate,
  });
}

export function filterDatesInWindow(
  dates: Date[],
  window: RollingWindow
): Date[] {
  return dates.filter((date) => isWithinRollingWindow(date, window));
}

export function calculateRetentionExpiry(
  creationDate: Date,
  retentionDays: number
): Date {
  return addDays(creationDate, retentionDays);
}

export function shouldArchive(
  creationDate: Date,
  archivalAfterDays: number,
  currentDate: Date = new Date()
): boolean {
  const archivalDate = addDays(creationDate, archivalAfterDays);
  return isAfter(currentDate, archivalDate);
}

export function shouldDelete(
  creationDate: Date,
  retentionDays: number,
  currentDate: Date = new Date()
): boolean {
  const expiryDate = calculateRetentionExpiry(creationDate, retentionDays);
  return isAfter(currentDate, expiryDate);
}

export function formatISO20022Date(date: Date): string {
  return date.toISOString().split('T')[0];
}

export function formatISO20022DateTime(date: Date): string {
  return date.toISOString().split('.')[0];
}