import fs from 'fs/promises'
import path from 'path'
import { getUserFromToken, hasAnyRole } from '../../../utils/auth.js'
import { randomUUID } from 'crypto'

// nosemgrep: javascript.lang.security.audit.path-traversal.path-join-resolve-traversal.path-join-resolve-traversal
// filename is always a hardcoded constant (e.g., 'newsletter-groups.json'), never user input
const getDataPath = (filename) => {
  const cwd = process.cwd()
  if (cwd.endsWith('.output')) {
    // nosemgrep: javascript.lang.security.audit.path-traversal.path-join-resolve-traversal.path-join-resolve-traversal
    return path.join(cwd, '../server/data', filename)
  }
    // nosemgrep: javascript.lang.security.audit.path-traversal.path-join-resolve-traversal.path-join-resolve-traversal
  return path.join(cwd, 'server/data', filename)
}

const NEWSLETTER_GROUPS_FILE = getDataPath('newsletter-groups.json')

async function readGroups() {
  try {
    const data = await fs.readFile(NEWSLETTER_GROUPS_FILE, 'utf-8')
    return JSON.parse(data)
  } catch (error) {
    if (error.code === 'ENOENT') {
      return []
    }
    throw error
  }
}

async function writeGroups(groups) {
  await fs.writeFile(NEWSLETTER_GROUPS_FILE, JSON.stringify(groups, null, 2), 'utf-8')
}

export default defineEventHandler(async (event) => {
  try {
    // Authentifizierung prüfen
    const token = getCookie(event, 'auth_token') || getHeader(event, 'authorization')?.replace('Bearer ', '')
    
    if (!token) {
      throw createError({
        statusCode: 401,
        statusMessage: 'Nicht authentifiziert'
      })
    }

    const user = await getUserFromToken(token)
    if (!user || !hasAnyRole(user, 'admin', 'vorstand', 'newsletter')) {
      throw createError({
        statusCode: 403,
        statusMessage: 'Keine Berechtigung'
      })
    }

    const body = await readBody(event)
    const { name, type, targetGroup, sendToExternal, description } = body

    if (!name || !type) {
      throw createError({
        statusCode: 400,
        statusMessage: 'Name und Typ sind erforderlich'
      })
    }

    if (type === 'subscription' && sendToExternal === undefined) {
      throw createError({
        statusCode: 400,
        statusMessage: 'sendToExternal ist für Abonnenten-Newsletter erforderlich'
      })
    }

    if (type === 'group' && !targetGroup) {
      throw createError({
        statusCode: 400,
        statusMessage: 'Zielgruppe ist für Gruppen-Newsletter erforderlich'
      })
    }

    const groups = await readGroups()
    
    // Prüfe ob Name bereits existiert
    if (groups.find(g => g.name.toLowerCase() === name.toLowerCase())) {
      throw createError({
        statusCode: 409,
        statusMessage: 'Eine Newsletter-Gruppe mit diesem Namen existiert bereits'
      })
    }
    
    const newGroup = {
      id: randomUUID(),
      name,
      description: description || '',
      type, // 'subscription' oder 'group'
      targetGroup: type === 'group' ? targetGroup : null,
      sendToExternal: type === 'subscription' ? sendToExternal : false,
      createdAt: new Date().toISOString(),
      createdBy: user.id,
      postCount: 0
    }

    groups.push(newGroup)
    await writeGroups(groups)

    return {
      success: true,
      message: 'Newsletter-Gruppe erfolgreich erstellt',
      group: newGroup
    }
  } catch (error) {
    console.error('Fehler beim Erstellen der Newsletter-Gruppe:', error)
    if (error.statusCode) {
      throw error
    }
    throw createError({
      statusCode: 500,
      statusMessage: 'Fehler beim Erstellen der Newsletter-Gruppe'
    })
  }
})