feat: change language

app/admin/guests/[id]/page.tsx

@@ -3,6 +3,7 @@ import { notFound } from "next/navigation"
 
 import { CopyInviteButton } from "@/components/admin/copy-invite-button"
 import { DeleteInvitationDialog } from "@/components/admin/delete-invitation-dialog"
+import { InvitationLanguageSelect } from "@/components/admin/invitation-language-select"
 import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert"
 import { Badge } from "@/components/ui/badge"
 import { Button } from "@/components/ui/button"
@@ -146,6 +147,14 @@ export default async function GuestDetailPage({
             <CardDescription>Admin-managed invitation fields.</CardDescription>
           </CardHeader>
           <CardContent className="space-y-3 text-sm">
+            <div className="space-y-2">
+              <span className="text-muted-foreground">Language</span>
+              <InvitationLanguageSelect
+                invitationId={detail.invitation.id}
+                currentLanguage={detail.invitation.language}
+                displayName={detail.invitation.display_name}
+              />
+            </div>
             <div className="flex justify-between gap-4">
               <span className="text-muted-foreground">Contact email</span>
               <span className="text-right">{detail.invitation.contact_email ?? "—"}</span>

app/admin/guests/actions.ts

@@ -4,14 +4,25 @@ import { revalidatePath } from "next/cache"
 
 import { auth } from "@/auth"
 import { isAdminEmail } from "@/lib/admin-auth"
-import { updateSaveTheDateSent } from "@/lib/db/queries/invitations"
-import { updateSaveTheDateSentSchema } from "@/lib/validation/invitation"
+import {
+  updateInvitationLanguage,
+  updateSaveTheDateSent,
+} from "@/lib/db/queries/invitations"
+import {
+  updateInvitationLanguageSchema,
+  updateSaveTheDateSentSchema,
+} from "@/lib/validation/invitation"
 
 export interface UpdateSaveTheDateSentResult {
   ok: boolean
   error: string | null
 }
 
+export interface UpdateInvitationLanguageResult {
+  ok: boolean
+  error: string | null
+}
+
 export async function updateSaveTheDateSentAction(input: {
   invitationId: string
   sent: boolean
@@ -49,3 +60,42 @@ export async function updateSaveTheDateSentAction(input: {
 
   return { ok: true, error: null }
 }
+
+export async function updateInvitationLanguageAction(input: {
+  invitationId: string
+  language: string
+}): Promise<UpdateInvitationLanguageResult> {
+  const session = await auth()
+  const adminEmail = session?.user?.email
+
+  if (!isAdminEmail(adminEmail)) {
+    return { ok: false, error: "You are not allowed to update invitations." }
+  }
+
+  const parsed = updateInvitationLanguageSchema.safeParse(input)
+
+  if (!parsed.success) {
+    return { ok: false, error: "Select a supported language." }
+  }
+
+  try {
+    const updated = await updateInvitationLanguage({
+      invitationId: parsed.data.invitationId,
+      language: parsed.data.language,
+      adminEmail: adminEmail ?? "",
+    })
+
+    if (!updated) {
+      return { ok: false, error: "This guest group no longer exists." }
+    }
+  } catch (error) {
+    console.error("Failed to update invitation language", error)
+    return { ok: false, error: "Could not update the invitation language." }
+  }
+
+  revalidatePath(`/admin/guests/${parsed.data.invitationId}`)
+  revalidatePath("/admin/guests")
+  revalidatePath("/admin")
+
+  return { ok: true, error: null }
+}