feat: add company management and user-company assignment in admin panel

shop/app/admin/companies/page.tsx

@@ -0,0 +1,186 @@
+'use client'
+
+import { useState, useEffect } from 'react'
+import { Building2, Plus, Trash2, Loader2 } from 'lucide-react'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog'
+import { getCompanies, createCompany, deleteCompany } from '@/lib/actions/companies'
+
+export default function CompaniesPage() {
+  const [companies, setCompanies] = useState<any[]>([])
+  const [loading, setLoading] = useState(true)
+  const [isCreateOpen, setIsCreateOpen] = useState(false)
+  const [name, setName] = useState('')
+  const [creating, setCreating] = useState(false)
+  const [createError, setCreateError] = useState<string | null>(null)
+  const [deletingId, setDeletingId] = useState<string | null>(null)
+
+  const loadCompanies = async () => {
+    setLoading(true)
+    try {
+      const data = await getCompanies()
+      setCompanies(data)
+    } catch (err) {
+      console.error('Fehler beim Laden der Firmen:', err)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  useEffect(() => {
+    loadCompanies()
+  }, [])
+
+  const handleCreate = async (e: React.FormEvent) => {
+    e.preventDefault()
+    setCreating(true)
+    setCreateError(null)
+    try {
+      await createCompany(name)
+      setIsCreateOpen(false)
+      setName('')
+      loadCompanies()
+    } catch (err: any) {
+      setCreateError(err.message || 'Fehler beim Anlegen.')
+    } finally {
+      setCreating(false)
+    }
+  }
+
+  const handleDelete = async (id: string, firmName: string) => {
+    if (!confirm(`Firma "${firmName}" wirklich löschen? Alle zugewiesenen Partner werden getrennt.`)) return
+    setDeletingId(id)
+    try {
+      await deleteCompany(id)
+      loadCompanies()
+    } catch (err) {
+      console.error('Fehler beim Löschen:', err)
+    } finally {
+      setDeletingId(null)
+    }
+  }
+
+  return (
+    <div className="p-6 max-w-4xl mx-auto text-slate-900 dark:text-white space-y-8">
+      {/* Header */}
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-3xl font-extrabold tracking-tight flex items-center gap-3">
+            <Building2 className="w-8 h-8 text-blue-500" />
+            Firmenverwaltung
+          </h1>
+          <p className="text-slate-500 dark:text-slate-400 text-sm mt-1">
+            Verwalten Sie Firmen und weisen Sie Partner zu.
+          </p>
+        </div>
+        <Button
+          onClick={() => setIsCreateOpen(true)}
+          className="bg-blue-600 hover:bg-blue-700 text-white font-semibold"
+        >
+          <Plus className="w-4 h-4 mr-2" /> Firma anlegen
+        </Button>
+      </div>
+
+      {/* Firmen-Tabelle */}
+      <div className="p-5 bg-white dark:bg-slate-900/50 rounded-xl border border-slate-200 dark:border-white/10 shadow-sm">
+        {loading ? (
+          <div className="flex justify-center items-center py-16">
+            <Loader2 className="w-8 h-8 text-blue-500 animate-spin" />
+            <span className="ml-3 text-slate-400 text-sm">Lade Firmen...</span>
+          </div>
+        ) : companies.length === 0 ? (
+          <div className="text-center py-16 border-2 border-dashed border-slate-200 dark:border-white/5 rounded-xl text-slate-500">
+            <Building2 className="w-10 h-10 mx-auto mb-3 opacity-30" />
+            Noch keine Firmen angelegt.
+          </div>
+        ) : (
+          <table className="w-full text-left">
+            <thead>
+              <tr className="border-b border-slate-200 dark:border-white/10 text-slate-400 text-xs font-semibold uppercase">
+                <th className="pb-3">Firmenname</th>
+                <th className="pb-3">Erstellt am</th>
+                <th className="pb-3 text-right">Aktionen</th>
+              </tr>
+            </thead>
+            <tbody className="divide-y divide-slate-100 dark:divide-white/5">
+              {companies.map((company) => (
+                <tr key={company.id} className="hover:bg-slate-50 dark:hover:bg-white/3 transition-colors">
+                  <td className="py-4 font-semibold text-slate-900 dark:text-white">
+                    <div className="flex items-center gap-2">
+                      <Building2 className="w-4 h-4 text-blue-500 shrink-0" />
+                      {company.name}
+                    </div>
+                  </td>
+                  <td className="py-4 text-sm text-slate-500 dark:text-slate-400">
+                    {company.created_at ? new Date(company.created_at).toLocaleDateString('de-DE') : '–'}
+                  </td>
+                  <td className="py-4 text-right">
+                    <Button
+                      variant="ghost"
+                      size="icon"
+                      disabled={deletingId === company.id}
+                      onClick={() => handleDelete(company.id, company.name)}
+                      className="h-8 w-8 text-red-500 hover:text-red-400 hover:bg-red-500/10"
+                      title="Firma löschen"
+                    >
+                      {deletingId === company.id
+                        ? <Loader2 className="h-4 w-4 animate-spin" />
+                        : <Trash2 className="h-4 w-4" />}
+                    </Button>
+                  </td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        )}
+      </div>
+
+      {/* Dialog: Neue Firma */}
+      <Dialog open={isCreateOpen} onOpenChange={setIsCreateOpen}>
+        <DialogContent className="bg-white dark:bg-slate-950 border-slate-200 dark:border-white/10 text-slate-900 dark:text-white shadow-2xl">
+          <DialogHeader>
+            <DialogTitle>Neue Firma anlegen</DialogTitle>
+            <DialogDescription className="text-slate-500 dark:text-slate-400">
+              Geben Sie den Namen der Firma ein. Partner können danach zugewiesen werden.
+            </DialogDescription>
+          </DialogHeader>
+          <form onSubmit={handleCreate} className="space-y-4 mt-2">
+            <div className="space-y-2">
+              <Label htmlFor="company-name">Firmenname</Label>
+              <Input
+                id="company-name"
+                type="text"
+                required
+                placeholder="Muster GmbH"
+                value={name}
+                onChange={(e) => setName(e.target.value)}
+                className="bg-slate-50 dark:bg-white/5 border-slate-200 dark:border-white/10"
+              />
+            </div>
+            {createError && (
+              <p className="text-sm text-red-600 dark:text-red-400">{createError}</p>
+            )}
+            <DialogFooter className="pt-2">
+              <Button type="button" variant="outline" onClick={() => setIsCreateOpen(false)} disabled={creating}>
+                Abbrechen
+              </Button>
+              <Button type="submit" disabled={creating} className="bg-blue-600 hover:bg-blue-700 text-white font-semibold">
+                {creating ? <Loader2 className="w-4 h-4 mr-2 animate-spin" /> : null}
+                Anlegen
+              </Button>
+            </DialogFooter>
+          </form>
+        </DialogContent>
+      </Dialog>
+    </div>
+  )
+}

shop/app/admin/einstellungen/page.tsx

@@ -169,6 +169,7 @@ export default function AdminSettings() {
               <thead>
                 <tr className="border-b border-slate-200 dark:border-white/10 text-slate-400 text-xs font-semibold uppercase">
                   <th className="pb-3">Partner E-Mail</th>
+                  <th className="pb-3">Firma</th>
                   <th className="pb-3">Status</th>
                   <th className="pb-3">Erstellt am</th>
                   <th className="pb-3 text-right">Aktionen</th>
@@ -186,6 +187,9 @@ export default function AdminSettings() {
                         {partner.email}
                       </div>
                     </td>
+                    <td className="py-4 text-sm text-slate-700 dark:text-slate-300">
+                      {partner.company_name || '–'}
+                    </td>
                     <td className="py-4">
                       {isGesperrt ? (
                         <span className="inline-flex items-center gap-1.5 px-2.5 py-0.5 rounded-full text-xs font-medium bg-red-100 text-red-700 dark:bg-red-500/10 dark:text-red-400 border border-red-200 dark:border-red-500/20">

shop/app/admin/layout.tsx

@@ -1,5 +1,5 @@
 import Link from 'next/link'
-import { LayoutDashboard, Package, Settings, Users, LayoutGrid, ShoppingCart, Wrench, Database } from 'lucide-react'
+import { LayoutDashboard, Package, Settings, Users, LayoutGrid, ShoppingCart, Wrench, Database, Building2 } from 'lucide-react'
 import { redirect } from 'next/navigation'
 import { createClient } from '@/lib/supabase/server'
 import { AdminLogoutButton } from '@/components/admin/logout-menu-item'
@@ -58,6 +58,10 @@ export default async function AdminLayout({
             <Users className="w-5 h-5" />
             Benutzer
           </Link>
+          <Link href="/admin/companies" className="flex items-center gap-3 px-3 py-2 rounded-lg text-slate-400 hover:text-white hover:bg-white/5 transition-all">
+            <Building2 className="w-5 h-5" />
+            Firmen
+          </Link>
 
           <div className="pt-2 pb-1 px-3">
             <span className="text-[10px] font-semibold uppercase tracking-wider text-slate-600">Einstellungen</span>

shop/app/admin/users/page.tsx

@@ -1,4 +1,5 @@
 import { getUsers } from '@/lib/actions/users'
+import { getCompanies } from '@/lib/actions/companies'
 import { UserList } from '@/components/admin/user-list'
 import { UserDialog } from '@/components/admin/user-dialog'
 import { Users } from 'lucide-react'
@@ -32,8 +33,8 @@ export default async function AdminUsersPage() {
 
 async function UserDataWrapper() {
   try {
-    const users = await getUsers()
-    return <UserList initialUsers={users} />
+    const [users, companies] = await Promise.all([getUsers(), getCompanies()])
+    return <UserList initialUsers={users} companies={companies} />
   } catch (error: any) {
     console.error('[UserDataWrapper] Error loading users:', error)
     return (

shop/components/admin/user-list.tsx

@@ -11,9 +11,10 @@ import {
   TableRow,
 } from '@/components/ui/table'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
-import { Key, Trash2, Mail, Loader2 } from 'lucide-react'
+import { Key, Trash2, Mail, Loader2, Building2 } from 'lucide-react'
 import { Button } from '@/components/ui/button'
 import { deleteUser, resetPassword, updateUserRole } from '@/lib/actions/users'
+import { assignCompanyToUser } from '@/lib/actions/companies'
 import { Badge } from '@/components/ui/badge'
 
 type Role = 'admin' | 'partner' | 'gesperrt'
@@ -30,7 +31,12 @@ const ROLE_BADGE_CLASSES: Record<Role, string> = {
   gesperrt: 'bg-red-500/20 text-red-400 border border-red-500/30',
 }
 
-export function UserList({ initialUsers }: { initialUsers: any[] }) {
+interface UserListProps {
+  initialUsers: any[]
+  companies: { id: string; name: string }[]
+}
+
+export function UserList({ initialUsers, companies }: UserListProps) {
   const router = useRouter()
   const [loadingId, setLoadingId] = useState<string | null>(null)
 
@@ -55,6 +61,18 @@ export function UserList({ initialUsers }: { initialUsers: any[] }) {
     }
   }
 
+  const handleCompanyChange = async (userId: string, companyId: string) => {
+    setLoadingId(userId + '-company')
+    try {
+      await assignCompanyToUser(userId, companyId === '' ? null : companyId)
+      router.refresh()
+    } catch (e) {
+      console.error('Fehler beim Zuweisen der Firma:', e)
+    } finally {
+      setLoadingId(null)
+    }
+  }
+
   const handleResetPassword = async (email: string) => {
     try {
       await resetPassword(email)
@@ -69,7 +87,7 @@ export function UserList({ initialUsers }: { initialUsers: any[] }) {
       <CardHeader>
         <CardTitle>Benutzerverwaltung</CardTitle>
         <CardDescription className="text-slate-400">
-          Verwalten Sie Rollen, Passwörter und Benutzerkonten.
+          Rollen, Firmenzuweisungen, Passwörter und Benutzerkonten verwalten.
         </CardDescription>
       </CardHeader>
       <CardContent>
@@ -78,6 +96,7 @@ export function UserList({ initialUsers }: { initialUsers: any[] }) {
             <TableRow className="border-white/10 hover:bg-white/5">
               <TableHead className="text-slate-200">E-Mail</TableHead>
               <TableHead className="text-slate-200">Rolle</TableHead>
+              <TableHead className="text-slate-200">Firma</TableHead>
               <TableHead className="text-slate-200">Zuletzt angemeldet</TableHead>
               <TableHead className="text-right text-slate-200">Aktionen</TableHead>
             </TableRow>
@@ -86,6 +105,7 @@ export function UserList({ initialUsers }: { initialUsers: any[] }) {
             {initialUsers.map((user) => {
               const role: Role = (['admin', 'partner', 'gesperrt'].includes(user.role) ? user.role : 'partner') as Role
               const isLoadingRole = loadingId === user.id + '-role'
+              const isLoadingCompany = loadingId === user.id + '-company'
               const isLoadingDelete = loadingId === user.id
 
               return (
@@ -116,6 +136,25 @@ export function UserList({ initialUsers }: { initialUsers: any[] }) {
                       )}
                     </div>
                   </TableCell>
+                  <TableCell>
+                    <div className="flex items-center gap-2">
+                      <Building2 className="w-4 h-4 text-slate-500 shrink-0" />
+                      {isLoadingCompany ? (
+                        <Loader2 className="h-4 w-4 animate-spin text-slate-400" />
+                      ) : (
+                        <select
+                          value={user.company_id || ''}
+                          onChange={(e) => handleCompanyChange(user.id, e.target.value)}
+                          className="text-xs bg-white/5 border border-white/10 rounded px-2 py-1 text-slate-300 hover:bg-white/10 cursor-pointer focus:outline-none focus:ring-1 focus:ring-primary/50 max-w-[150px]"
+                        >
+                          <option value="">Keine Firma</option>
+                          {companies.map((c) => (
+                            <option key={c.id} value={c.id}>{c.name}</option>
+                          ))}
+                        </select>
+                      )}
+                    </div>
+                  </TableCell>
                   <TableCell className="text-slate-400 text-sm">
                     {user.last_sign_in_at ? new Date(user.last_sign_in_at).toLocaleString('de-DE') : 'Noch nie'}
                   </TableCell>

shop/lib/actions/companies.ts

@@ -0,0 +1,49 @@
+'use server'
+
+import { createAdminClient } from '@/lib/supabase/admin'
+import { revalidatePath } from 'next/cache'
+
+export async function getCompanies() {
+  const admin = createAdminClient()
+  const { data, error } = await admin
+    .from('companies')
+    .select('id, name, created_at')
+    .order('name', { ascending: true })
+  if (error) throw error
+  return data || []
+}
+
+export async function createCompany(name: string) {
+  const admin = createAdminClient()
+  const { data, error } = await admin
+    .from('companies')
+    .insert({ name: name.trim() })
+    .select()
+    .single()
+  if (error) throw error
+  revalidatePath('/admin/companies')
+  revalidatePath('/admin/users')
+  return data
+}
+
+export async function deleteCompany(id: string) {
+  const admin = createAdminClient()
+  const { error } = await admin
+    .from('companies')
+    .delete()
+    .eq('id', id)
+  if (error) throw error
+  revalidatePath('/admin/companies')
+  revalidatePath('/admin/users')
+}
+
+export async function assignCompanyToUser(userId: string, companyId: string | null) {
+  const admin = createAdminClient()
+  const { error } = await admin
+    .from('users')
+    .update({ company_id: companyId })
+    .eq('id', userId)
+  if (error) throw error
+  revalidatePath('/admin/users')
+  revalidatePath('/admin/einstellungen')
+}

shop/lib/actions/users.ts

@@ -10,18 +10,24 @@ export async function getUsers() {
 
   const { data: dbUsers, error: dbError } = await admin
     .from('users')
-    .select('id, role')
+    .select('id, role, company_id, companies(id, name)')
   
-  const roleMap: Record<string, string> = {}
+  const userMap: Record<string, { role: string; company_id: string | null; company_name: string | null }> = {}
   if (!dbError && dbUsers) {
-    dbUsers.forEach(u => {
-      roleMap[u.id] = u.role
+    dbUsers.forEach((u: any) => {
+      userMap[u.id] = {
+        role: u.role,
+        company_id: u.company_id || null,
+        company_name: u.companies?.name || null,
+      }
     })
   }
 
   return users.map(u => ({
     ...u,
-    role: roleMap[u.id] || 'partner'
+    role: userMap[u.id]?.role || 'partner',
+    company_id: userMap[u.id]?.company_id || null,
+    company_name: userMap[u.id]?.company_name || null,
   }))
 }
 
@@ -90,15 +96,26 @@ export async function getPartners() {
 
   const { data: dbUsers, error: dbError } = await admin
     .from('users')
-    .select('id, role')
+    .select('id, role, company_id, companies(id, name)')
     .in('role', ['partner', 'gesperrt'])
   if (dbError) throw dbError
 
-  const roleMap: Record<string, string> = {}
-  dbUsers.forEach(u => { roleMap[u.id] = u.role })
+  const userMap: Record<string, { role: string; company_id: string | null; company_name: string | null }> = {}
+  dbUsers.forEach((u: any) => {
+    userMap[u.id] = {
+      role: u.role,
+      company_id: u.company_id || null,
+      company_name: u.companies?.name || null,
+    }
+  })
 
   const partnerIds = new Set(dbUsers.map(u => u.id))
   return users
     .filter(u => partnerIds.has(u.id))
-    .map(u => ({ ...u, role: roleMap[u.id] || 'partner' }))
+    .map(u => ({
+      ...u,
+      role: userMap[u.id]?.role || 'partner',
+      company_id: userMap[u.id]?.company_id || null,
+      company_name: userMap[u.id]?.company_name || null,
+    }))
 }

shop/supabase/migrations/20260624100000_create_companies_table.sql

@@ -0,0 +1,31 @@
+-- Migration: companies table + company_id in users
+
+-- 1. Tabelle companies erstellen
+CREATE TABLE IF NOT EXISTS public.companies (
+  id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  name       TEXT NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+-- RLS aktivieren
+ALTER TABLE public.companies ENABLE ROW LEVEL SECURITY;
+
+-- Policies
+DROP POLICY IF EXISTS "Admins und Partner lesen Firmen" ON public.companies;
+DROP POLICY IF EXISTS "Service role kann alles" ON public.companies;
+
+CREATE POLICY "Admins und Partner lesen Firmen"
+  ON public.companies FOR SELECT
+  USING (auth.role() = 'authenticated');
+
+CREATE POLICY "Service role kann alles"
+  ON public.companies FOR ALL
+  USING (true)
+  WITH CHECK (true);
+
+-- 2. company_id zu public.users hinzufügen
+ALTER TABLE public.users
+  ADD COLUMN IF NOT EXISTS company_id UUID REFERENCES public.companies(id) ON DELETE SET NULL;
+
+-- Reload Schema Cache
+NOTIFY pgrst, 'reload schema';