// SQL for `content_reports` (TEAMS.md §5.6).
//
// Not under model/teams/ even though Team forum content is its only consumer
// today: the table is deliberately generic — `target_type` is a VARCHAR so that a
// wiki page or a news comment becomes a new value rather than a new table — and
// filing it under a feature it will outgrow is how the next consumer ends up
// building its own.
//
// Nothing here decides who may read a report. That is the route's job, and there
// is exactly one answer: site staff (§5.6, and the org lead's 2026-08-18 ruling
// that reports are site administration only).

const { query } = require('../../utils/db')

const COLUMNS = `
  id, target_type, target_id, team_id, reporter_user_id, reporter_username,
  reason, detail, status, handled_by, handled_username, handled_note, handled_at,
  created_at`

const OPEN_STATUSES = ['open', 'reviewing']

/**
 * File a report.
 *
 * The duplicate is caught by the unique key rather than by a SELECT first, which
 * is the difference between "usually not a duplicate" and "never a duplicate":
 * two taps of a report button race, and only the index settles it. ER_DUP_ENTRY
 * comes back as a clean `null` so the caller can answer 409 without knowing what
 * a MySQL error code looks like.
 */
async function insert({ targetType, targetId, teamId, reporterUserId, reporterUsername, reason, detail }) {
  try {
    const res = await query(
      `INSERT INTO content_reports
         (target_type, target_id, team_id, reporter_user_id, reporter_username, reason, detail)
       VALUES (?, ?, ?, ?, ?, ?, ?)`,
      [targetType, targetId, teamId ?? null, reporterUserId, reporterUsername, reason, detail ?? null],
    )
    return res.insertId
  } catch (err) {
    if (err && (err.code === 'ER_DUP_ENTRY' || err.errno === 1062)) return null
    throw err
  }
}

async function byId(id) {
  const rows = await query(`SELECT ${COLUMNS} FROM content_reports WHERE id = ? LIMIT 1`, [id])
  return rows[0] || null
}

/**
 * The queue.
 *
 * `status` defaults to the two OPEN statuses rather than to everything: a staffer
 * opening the queue wants the work, not the archive. 'all' is the explicit escape
 * hatch and every single status is selectable, so nothing is unreachable.
 */
async function list({ status, teamId, limit = 100, offset = 0 } = {}) {
  const where = []
  const args = []
  if (status && status !== 'all') {
    where.push('status = ?')
    args.push(status)
  } else if (!status) {
    where.push(`status IN (${OPEN_STATUSES.map(() => '?').join(',')})`)
    args.push(...OPEN_STATUSES)
  }
  if (teamId) {
    where.push('team_id = ?')
    args.push(teamId)
  }
  args.push(limit, offset)
  return query(
    `SELECT ${COLUMNS} FROM content_reports
      ${where.length ? `WHERE ${where.join(' AND ')}` : ''}
      ORDER BY created_at DESC, id DESC LIMIT ? OFFSET ?`,
    args,
  )
}

/** How many are waiting, for the dashboard badge. */
async function openCount() {
  const rows = await query(
    `SELECT COUNT(*) AS n FROM content_reports WHERE status IN (${OPEN_STATUSES.map(() => '?').join(',')})`,
    OPEN_STATUSES,
  )
  return Number(rows[0]?.n || 0)
}

/**
 * Record a staffer's decision.
 *
 * `handled_*` is stamped for every status including `reviewing`, so "who has this"
 * is answerable while it is in progress and not only after it is closed — that is
 * what stops two staffers working the same report.
 */
async function handle(id, { status, handledBy, handledUsername, note }) {
  const res = await query(
    `UPDATE content_reports
        SET status = ?, handled_by = ?, handled_username = ?, handled_note = ?, handled_at = NOW()
      WHERE id = ?`,
    [status, handledBy, handledUsername, note ?? null, id],
  )
  return res.affectedRows > 0
}

// ── target enrichment ──────────────────────────────────────────────────────
//
// Three batched reads rather than one per row. §5.6's fourth rule — "reports on
// uploads carry the team_forum_uploads row, so a staffer sees uploader, size and
// sniffed type without hunting" — is the reason the queue enriches at all, and a
// queue that N+1s to do it would be the version that gets turned off.

async function threadsByIds(ids) {
  if (!ids.length) return []
  return query(
    `SELECT id, team_id, title, type, status, created_username FROM team_forum_threads
      WHERE id IN (${ids.map(() => '?').join(',')})`,
    ids,
  )
}

async function postsByIds(ids) {
  if (!ids.length) return []
  return query(
    `SELECT p.id, p.thread_id, p.author_user_id, p.author_username, p.body_html, p.status,
            p.created_at, t.team_id, t.title AS thread_title
       FROM team_forum_posts p JOIN team_forum_threads t ON t.id = p.thread_id
      WHERE p.id IN (${ids.map(() => '?').join(',')})`,
    ids,
  )
}

async function uploadsByIds(ids) {
  if (!ids.length) return []
  return query(
    `SELECT id, team_id, post_id, uploader_user_id, uploader_username, filename,
            mimetype, byte_size, created_at, deleted_at
       FROM team_forum_uploads WHERE id IN (${ids.map(() => '?').join(',')})`,
    ids,
  )
}

module.exports = {
  OPEN_STATUSES,
  insert,
  byId,
  list,
  openCount,
  handle,
  threadsByIds,
  postsByIds,
  uploadsByIds,
}