// Date + label helpers shared across pages.

const MONTHS = [
  'January', 'February', 'March', 'April', 'May', 'June',
  'July', 'August', 'September', 'October', 'November', 'December',
]

function parse(value) {
  if (!value) return null
  const d = new Date(value)
  return isNaN(d.getTime()) ? null : d
}

// "June 24, 2026"
export function longDate(value) {
  const d = parse(value)
  if (!d) return ''
  return `${MONTHS[d.getMonth()]} ${d.getDate()}, ${d.getFullYear()}`
}

// "Jun 24"
export function shortDate(value) {
  const d = parse(value)
  if (!d) return ''
  return `${MONTHS[d.getMonth()].slice(0, 3)} ${d.getDate()}`
}

// "Jun 26 18:55"
export function dateTime(value) {
  const d = parse(value)
  if (!d) return ''
  const hh = String(d.getHours()).padStart(2, '0')
  const mm = String(d.getMinutes()).padStart(2, '0')
  return `${MONTHS[d.getMonth()].slice(0, 3)} ${d.getDate()} ${hh}:${mm}`
}

// { mon: 'JUN', num: "'26" } for the newsletter month tile
export function monthTile(value) {
  const d = parse(value)
  if (!d) return { mon: '—', num: '' }
  return { mon: MONTHS[d.getMonth()].slice(0, 3).toUpperCase(), num: `'${String(d.getFullYear()).slice(2)}` }
}

// Compact relative time: "5m ago", "2h ago", "1d ago"
export function ago(value) {
  const d = parse(value)
  if (!d) return ''
  const secs = Math.max(1, Math.floor((Date.now() - d.getTime()) / 1000))
  if (secs < 60) return `${secs}s ago`
  const mins = Math.floor(secs / 60)
  if (mins < 60) return `${mins}m ago`
  const hrs = Math.floor(mins / 60)
  if (hrs < 24) return `${hrs}h ago`
  const days = Math.floor(hrs / 24)
  return `${days}d ago`
}

const CATEGORY_LABELS = {
  news: 'News',
  five_on_friday: 'Five on Friday',
  newsletter: 'Newsletter',
  screenshot: 'Screenshot',
}
export function categoryLabel(dbCategory) {
  return CATEGORY_LABELS[dbCategory] || dbCategory
}