import { getUserFromToken, readUsers, writeUsers } from '../../../utils/auth.js'

export default defineEventHandler(async (event) => {
  try {
    const token = getCookie(event, 'auth_token')
    const currentUser = await getUserFromToken(token)

    if (!currentUser || (currentUser.role !== 'admin' && currentUser.role !== 'vorstand')) {
      throw createError({
        statusCode: 403,
        message: 'Zugriff verweigert'
      })
    }

    const body = await readBody(event)
    const { userId, role } = body

    if (!['mitglied', 'vorstand', 'admin'].includes(role)) {
      throw createError({
        statusCode: 400,
        message: 'Ungültige Rolle'
      })
    }

    const users = await readUsers()
    const user = users.find(u => u.id === userId)

    if (!user) {
      throw createError({
        statusCode: 404,
        message: 'Benutzer nicht gefunden'
      })
    }

    user.role = role
    const updatedUsers = users.map(u => u.id === userId ? user : u)
    await writeUsers(updatedUsers)

    return {
      success: true,
      message: 'Rolle wurde aktualisiert'
    }
  } catch (error) {
    console.error('Fehler beim Aktualisieren der Rolle:', error)
    throw error
  }
})