// What Admin → Teams SAYS, separated from how it renders (docs/website/TEAMS.md
// §2.4, §2.8, §2.9).
//
// Plain JS with tests, following lib/moduleAdmin.js. The reason it is worth
// splitting here specifically: this screen's job is to tell an operator the
// difference between "the shard has no Teams" and "core has not been able to ask
// for two hours", and those two produce almost the same page. Getting that
// wording right is logic, not markup.

/** Tones the screen uses. Names, not colours — the view maps them. */
export const TONE = { ok: 'ok', warn: 'warn', bad: 'bad', idle: 'idle' }

/**
 * How to describe the projection's freshness.
 *
 * The four states are genuinely different and an operator needs to tell them
 * apart:
 *
 *   - no provider registered — nothing to sync, and not a fault;
 *   - never synced — core has an empty projection it has never confirmed, which
 *     must NOT read as "there are no Teams";
 *   - stale — the projection is real but old, and the reason is usually in
 *     `lastError`;
 *   - current.
 */
export function freshnessOf(sync = {}) {
  if (!sync.configured) {
    return { tone: TONE.idle, label: 'No Team provider', detail: 'No installed module supplies Teams.' }
  }
  if (!sync.lastSyncAt) {
    return {
      tone: TONE.bad,
      label: 'Never synced',
      detail: 'Core has never had an answer it could trust. What is shown below is not a confirmed empty shard.',
    }
  }
  if (sync.stale) {
    return {
      tone: TONE.warn,
      label: 'Stale',
      detail: `Last confirmed ${ago(sync.lastSyncAt)}. Rosters below may be out of date.`,
    }
  }
  return { tone: TONE.ok, label: 'Current', detail: `Last confirmed ${ago(sync.lastSyncAt)}.` }
}

/**
 * A short, human age. Deliberately coarse: this exists so a sentence reads
 * "confirmed 14 minutes ago", and second-level precision would be false comfort
 * about a projection whose interval is fifteen minutes.
 */
export function ago(value) {
  if (!value) return 'never'
  const seconds = Math.max(0, Math.round((Date.now() - new Date(value).getTime()) / 1000))
  if (seconds < 90) return 'just now'
  const minutes = Math.round(seconds / 60)
  if (minutes < 60) return `${minutes} minutes ago`
  const hours = Math.round(minutes / 60)
  if (hours < 48) return `${hours} hour${hours === 1 ? '' : 's'} ago`
  return `${Math.round(hours / 24)} days ago`
}

/** The status pill for one Team row. */
export function statusOf(team = {}) {
  if (team.status === 'archived') {
    return { tone: TONE.idle, label: team.archivedReason === 'renamed' ? 'Renamed' : 'Archived' }
  }
  if (team.hidden && team.hiddenReason === 'reserved_name') {
    return { tone: TONE.bad, label: 'Hidden — reserved name' }
  }
  if (team.hidden) return { tone: TONE.warn, label: 'Hidden by staff' }
  return { tone: TONE.ok, label: 'Public' }
}

/**
 * What a staff member is told will happen when they press the button.
 *
 * The gate is decided server-side from the caller's live role, so this only
 * describes it. Saying "Request" to a moderator and "Apply" to an admin is what
 * stops the pending result being a surprise.
 */
export function gateLabelFor(role, verb) {
  return role === 'admin' ? verb : `Request ${verb.toLowerCase()}`
}

/** The three gated actions, for the note under the buttons. */
export const GATED_NOTE =
  'Publishing a game-written name needs an admin: a moderator’s un-hide or display-name change '
  + 'is filed for approval. Hiding is not gated — suppression is always safe.'

/** A one-line description of a queued request, for the approval queue. */
export function describeRequest(request = {}) {
  const payload = parsePayload(request.payload)
  const who = request.requested_username || 'a deleted user'
  switch (request.action) {
    case 'unhide':
      return `${who} asks to publish “${request.team_name}”`
    case 'display_name_override':
      return `${who} asks to display “${request.team_name}” as “${payload.displayName || ''}”`
    case 'clear_display_name_override':
      return `${who} asks to clear the display name on “${request.team_name}”`
    default:
      return `${who} asks for “${request.action}” on “${request.team_name}”`
  }
}

/**
 * The payload may arrive parsed or as a JSON string depending on the driver, so
 * this normalises rather than assuming either. The server has the same note.
 */
export function parsePayload(payload) {
  if (payload == null) return {}
  if (typeof payload === 'object') return payload
  try {
    return JSON.parse(payload)
  } catch {
    return {}
  }
}

/**
 * How a member's leadership should read.
 *
 * An override is shown AS an override rather than folded into the answer: staff
 * looking at a roster need to see that a decision was made, not a fact that looks
 * like the game's.
 */
export function leadershipOf(member = {}) {
  if (!member.leaderOverride) {
    return { isLeader: Boolean(member.isLeader), overridden: false, note: null }
  }
  const granted = member.leaderOverride.effect === 'grant'
  return {
    isLeader: granted,
    overridden: true,
    note: `${granted ? 'Granted' : 'Denied'} by ${member.leaderOverride.by || 'a deleted user'}`
      + `${member.leaderOverride.reason ? ` — ${member.leaderOverride.reason}` : ''}`
      + ` (the game says ${member.isLeaderSynced ? 'leader' : 'not a leader'})`,
  }
}