import { config } from '../config.js'
import { ADMIN_LABEL, STAFF_LABELS } from '../services/staffLabels.js'

/**
 * Prueft das Appwrite-JWT aus dem Ticketsystem und verlangt eines der Labels `allowed`.
 * requireAppwriteStaff: nur "admin" (Kunden, Mitarbeiter, Finanzen ...).
 * requireAppwriteTeam: jeder Mitarbeiter ("mitarbeiter" oder "admin") - Projekt-Aktionen
 * (Anlegen, Zuordnen, Archivieren, Preview, Analyse, Gitea-Import), Entscheidung 2026-10-04.
 */
function requireAppwriteLabels(allowed, deniedMessage) {
  return (req, res, next) => checkAppwriteJwt(req, res, next, allowed, deniedMessage)
}

export const requireAppwriteStaff = requireAppwriteLabels([ADMIN_LABEL], 'Admin-Berechtigung erforderlich')
export const requireAppwriteTeam = requireAppwriteLabels(STAFF_LABELS, 'Nur für Mitarbeiter')

async function checkAppwriteJwt(req, res, next, allowed, deniedMessage) {
  const authHeader = req.get('Authorization') || ''
  const match = authHeader.match(/^Bearer\s+(.+)$/i)
  if (!match) {
    return res.status(401).json({ error: 'Authorization Bearer JWT erforderlich' })
  }

  const jwt = match[1]

  try {
    const response = await fetch(`${config.appwrite.endpoint}/account`, {
      headers: {
        'Content-Type': 'application/json',
        'X-Appwrite-Project': config.appwrite.projectId,
        'X-Appwrite-JWT': jwt,
      },
    })

    const text = await response.text()
    let data = null
    if (text) {
      try {
        data = JSON.parse(text)
      } catch {
        data = { message: text }
      }
    }

    if (!response.ok) {
      return res.status(401).json({ error: data?.message || 'Ungültiges JWT' })
    }

    if (!Array.isArray(data?.labels) || !allowed.some((label) => data.labels.includes(label))) {
      return res.status(403).json({ error: deniedMessage })
    }

    req.appwriteUser = data
    return next()
  } catch (err) {
    return res.status(500).json({ error: err.message || 'JWT-Validierung fehlgeschlagen' })
  }
}