import cookieParser from 'cookie-parser'
import { config } from '../config.js'
import { isSessionPasswordCurrent } from '../services/passwordVersion.js'
import { clearPreviewSession } from '../services/previewSession.js'

export const SESSION_REVOKED_MESSAGE = 'Dein Passwort wurde geändert. Bitte melde dich mit dem neuen Passwort an.'

const SESSION_MAX_AGE_MS = 7 * 24 * 60 * 60 * 1000

export function sessionMiddleware() {
  return cookieParser(config.sessionSecret)
}

export function setPortalSession(res, data, { maxAgeMs = SESSION_MAX_AGE_MS } = {}) {
  res.cookie(config.cookieName, JSON.stringify(data), {
    httpOnly: true,
    secure: process.env.NODE_ENV === 'production',
    sameSite: 'lax',
    maxAge: maxAgeMs,
    signed: true,
  })
}

export function clearPortalSession(res) {
  res.clearCookie(config.cookieName, {
    httpOnly: true,
    secure: process.env.NODE_ENV === 'production',
    sameSite: 'lax',
    signed: true,
  })
}

export function parsePortalSession(req) {
  const raw = req.signedCookies?.[config.cookieName]
  if (!raw) return null
  try {
    return JSON.parse(raw)
  } catch {
    return null
  }
}

export async function requireSession(req, res, next) {
  const session = parsePortalSession(req)
  if (!session) {
    return res.status(401).json({ error: 'Nicht angemeldet' })
  }
  if (!session.customerId || !session.appwriteUserId) {
    return res.status(401).json({ error: 'Ungültige Session' })
  }
  // Nach einer Passwortaenderung gelten aeltere Sessions nicht mehr (auf anderen Geraeten abgemeldet)
  if (!(await isSessionPasswordCurrent(session))) {
    clearPortalSession(res)
    clearPreviewSession(res)
    return res.status(401).json({ error: SESSION_REVOKED_MESSAGE, code: 'session_revoked' })
  }
  req.session = session
  next()
}

export function getSessionCustomerId(req) {
  return req.session?.customerId
}