/**
 * Converts an ISO date string or Date to Jalali (Persian) date and time.
 * @param input - ISO date string (e.g. 2026-02-08T13:51:20.747+00:00) or Date
 * @returns Tuple [dateStr, timeStr] e.g. ['1404/11/24', '13:37']
 */
export function toJalaliDateAndTime(
  input: string | Date,
): [string, string] {
  const d = new Date(input);
  const dateStr = toJalaliDate(d);
  const timeStr = toJalaliTime(d);
  return [dateStr, timeStr];
}

/**
 * Converts a Date to Jalali date string (e.g. 1404/11/24).
 */
export function toJalaliDate(d: Date): string {
  const persianDate = d.toLocaleDateString("fa-IR", {
    year: "numeric",
    month: "2-digit",
    day: "2-digit",
  });
  return persianDigitsToEnglish(persianDate, "/");
}

/**
 * Converts a Date to 24h time string (e.g. 13:37).
 */
export function toJalaliTime(d: Date): string {
  const hours = d.getHours().toString().padStart(2, "0");
  const minutes = d.getMinutes().toString().padStart(2, "0");
  return `${hours}:${minutes}`;
}

const PERSIAN_TO_ENGLISH: Record<string, string> = {
  "۰": "0",
  "۱": "1",
  "۲": "2",
  "۳": "3",
  "۴": "4",
  "۵": "5",
  "۶": "6",
  "۷": "7",
  "۸": "8",
  "۹": "9",
};

function persianDigitsToEnglish(str: string, separator: string): string {
  return str
    .split(separator)
    .map((part) =>
      part
        .split("")
        .map((char) => PERSIAN_TO_ENGLISH[char] ?? char)
        .join(""),
    )
    .join("/");
}