import { jwtVerify } from 'jose'
import bcrypt from 'bcryptjs'
import { isOnsite } from './ip-check.js'
import { pool } from './db.js'

const APP_SLUG = process.env.APP_SLUG || 'tablet-checkin'
const secret = new TextEncoder().encode(process.env.CENTRAL_AUTH_SECRET || '')

// Deliberately its own cookie name — NOT 'hnf_session' (central auth's real
// staff-session cookie). Sharing that name caused a real collision bug in
// hvac's kiosk (see project_hvac_kiosk memory, hit 2026-08-26): a stale
// same-named cookie from testing the kiosk login could shadow a subsequent
// real staff login on the same origin. Mirroring that fix here rather than
// rediscovering it — this app's own requireAuth checks hnf_session first,
// falls back to this one, and the two are fully independent.
const KIOSK_COOKIE = 'tablet_checkin_kiosk_session'

// ── Tier 1: staff JWT (central auth) + tablet kiosk session ────────────────
// Gates the human-facing staff routes: admin/audit (checkins.js), device
// registry management, terminal key management, marketing config, settings.
export async function requireAuth(request, reply) {
  const token = request.cookies?.hnf_session || request.cookies?.[KIOSK_COOKIE]
  if (!token) return reply.status(401).send({ error: 'Not authenticated' })

  let payload
  try {
    const { payload: p } = await jwtVerify(token, secret)
    payload = p
  } catch {
    return reply.status(401).send({ error: 'Invalid session' })
  }

  if (!payload.apps?.includes(APP_SLUG)) {
    return reply.status(403).send({ error: 'No permission for this app' })
  }

  if (!payload.offsite_allowed) {
    const clientIP = request.headers['x-real-ip'] || request.ip
    if (!(await isOnsite(clientIP))) {
      return reply.status(403).send({ error: 'Access restricted to site network' })
    }
  }

  const prefix = `${APP_SLUG}:`
  let caps
  if (Array.isArray(payload.caps)) {
    caps = payload.caps.filter(c => c.startsWith(prefix)).map(c => c.slice(prefix.length))
  } else {
    caps = [] // legacy token — nothing granted until re-login
  }

  request.user = {
    email: payload.sub,
    name: payload.name,
    is_admin: payload.is_admin ?? false,
    caps,
  }
}

export function hasCap(request, cap) {
  return request.user?.is_admin === true || request.user?.caps?.includes(cap) === true
}

export function requireCap(cap) {
  return async (request, reply) => {
    if (!hasCap(request, cap)) {
      return reply.status(403).send({ error: `Missing capability: ${cap}` })
    }
  }
}

export { KIOSK_COOKIE }

// ── Tier 2: terminal API key ────────────────────────────────────────────────
// Authorizes the standalone Chrome extension's push call (routes/staff.js)
// only — never used for anything human-facing. Distinct from both the staff
// JWT and the tablet's own kiosk session: hotel-owned physical/desktop
// hardware gets a device-level bearer credential instead of a per-user login.
// Header: `Authorization: Bearer <raw key>`. The raw key is shown once at
// creation (routes/terminals.js) and only its bcrypt hash is ever stored, so
// verifying means iterating the small set of non-revoked terminals and
// comparing — fine at this scale (a handful of reception PCs, not users).
export async function requireTerminalAuth(request, reply) {
  const header = request.headers['authorization'] || ''
  const key = header.startsWith('Bearer ') ? header.slice(7).trim() : null
  if (!key) return reply.status(401).send({ error: 'Terminal API key required' })

  const { rows } = await pool.query(
    `SELECT terminal_id, api_key_hash FROM terminals WHERE revoked_at IS NULL`
  )
  for (const row of rows) {
    if (await bcrypt.compare(key, row.api_key_hash)) {
      await pool.query(`UPDATE terminals SET last_used_at = now() WHERE terminal_id = $1`, [row.terminal_id])
      request.terminal = { terminal_id: row.terminal_id }
      return
    }
  }
  return reply.status(401).send({ error: 'Invalid or revoked terminal key' })
}