/**
 * Shared date/time formatting utilities for Route Commerce.
 * All dates are stored as TIMESTAMPTZ in PostgreSQL (UTC).
 * Display dates in MM/DD/YYYY format in US locale.
 */

export function formatDate(date: string | Date | null | undefined): string {
  if (!date) return "—";
  const d = typeof date === "string" ? new Date(date) : date;
  if (isNaN(d.getTime())) return "—";
  return d.toLocaleDateString("en-US", {
    month: "2-digit",
    day: "2-digit",
    year: "numeric",
  });
}

export function formatDateTime(date: string | Date | null | undefined): string {
  if (!date) return "—";
  const d = typeof date === "string" ? new Date(date) : date;
  if (isNaN(d.getTime())) return "—";
  return d.toLocaleDateString("en-US", {
    month: "2-digit",
    day: "2-digit",
    year: "numeric",
    hour: "2-digit",
    minute: "2-digit",
  });
}

export function formatTime(date: string | Date | null | undefined): string {
  if (!date) return "—";
  const d = typeof date === "string" ? new Date(date) : date;
  if (isNaN(d.getTime())) return "—";
  return d.toLocaleTimeString("en-US", {
    hour: "2-digit",
    minute: "2-digit",
  });
}

/**
 * "Just now" / "5m ago" / "2h ago" / "yesterday" / "3d ago" / MM/DD/YYYY.
 *
 * Used by the v2 admin Orders list (CardList time-ago badge) and any
 * other place that needs a humanized, glanceable timestamp without
 * pulling in a date library. Buckets are deliberately coarse — anything
 * past a week is shown as the absolute date (MM/DD/YYYY) via formatDate.
 */
export function formatRelativeTime(input: string | Date | number): string {
  const date = input instanceof Date ? input : new Date(input);
  if (isNaN(date.getTime())) return "—";
  const diffMs = Date.now() - date.getTime();
  const diffSec = Math.round(diffMs / 1000);
  if (diffSec < 45) return "just now";
  const diffMin = Math.round(diffSec / 60);
  if (diffMin < 60) return `${diffMin}m ago`;
  const diffHr = Math.round(diffMin / 60);
  if (diffHr < 24) return `${diffHr}h ago`;
  const diffDay = Math.round(diffHr / 24);
  if (diffDay === 1) return "yesterday";
  if (diffDay < 7) return `${diffDay}d ago`;
  return formatDate(date);
}