/**
 * Formats an ISO date (`YYYY-MM-DD`) for display.
 * Forced to UTC so a post dated 2026-05-09 never renders as May 8 for
 * visitors west of Greenwich.
 */
export function formatDate(date: string): string {
  return new Date(date).toLocaleDateString("en-US", {
    year: "numeric",
    month: "long",
    day: "numeric",
    timeZone: "UTC",
  });
}

/**
 * Rough reading time in minutes, from raw MDX.
 *
 * Frontmatter is already stripped by `lib/devblog`, but markdown syntax is
 * not: fences, link targets and heading markers are dropped so a post is not
 * credited for characters nobody reads. 200 wpm, floored at one minute.
 */
export function readingTime(content: string): number {
  const words = content
    .replace(/```[\s\S]*?```/g, "")
    .replace(/\[([^\]]*)\]\([^)]*\)/g, "$1")
    .replace(/[#>*_`~-]/g, " ")
    .split(/\s+/)
    .filter(Boolean).length;

  return Math.max(1, Math.round(words / 200));
}