feat: add document management frontend (Phase 2N)

frontend/src/app/(app)/cases/[id]/page.tsx

@@ -6,6 +6,8 @@ import { api } from "@/lib/api";
 import type { Case, CaseEvent, Party, Deadline, Document } from "@/lib/types";
 import { CaseTimeline } from "@/components/cases/CaseTimeline";
 import { PartyList } from "@/components/cases/PartyList";
+import { DocumentUpload } from "@/components/documents/DocumentUpload";
+import { DocumentList } from "@/components/documents/DocumentList";
 import { ArrowLeft, Clock, FileText, Users, Activity } from "lucide-react";
 import { format } from "date-fns";
 import { de } from "date-fns/locale";
@@ -55,7 +57,7 @@ export default function CaseDetailPage() {
   const { data: documentsData } = useQuery({
     queryKey: ["case-documents", id],
     queryFn: () => api.get<Document[]>(`/cases/${id}/documents`),
-    enabled: activeTab === "documents",
+    enabled: activeTab === "documents" || activeTab === "timeline",
   });
 
   if (isLoading) {
@@ -147,6 +149,11 @@ export default function CaseDetailPage() {
                   {caseDetail.deadlines_count}
                 </span>
               )}
+              {tab.key === "documents" && documents.length > 0 && (
+                <span className="ml-1 rounded-full bg-neutral-100 px-1.5 py-0.5 text-xs text-neutral-500">
+                  {documents.length}
+                </span>
+              )}
               {tab.key === "parties" && caseDetail.parties.length > 0 && (
                 <span className="ml-1 rounded-full bg-neutral-100 px-1.5 py-0.5 text-xs text-neutral-500">
                   {caseDetail.parties.length}
@@ -167,7 +174,10 @@ export default function CaseDetailPage() {
         )}
 
         {activeTab === "documents" && (
-          <DocumentsList documents={documents} />
+          <div className="space-y-6">
+            <DocumentUpload caseId={id} />
+            <DocumentList documents={documents} caseId={id} />
+          </div>
         )}
 
         {activeTab === "parties" && (
@@ -224,44 +234,3 @@ function DeadlinesList({ deadlines }: { deadlines: Deadline[] }) {
   );
 }
 
-function DocumentsList({ documents }: { documents: Document[] }) {
-  if (documents.length === 0) {
-    return (
-      <p className="py-8 text-center text-sm text-neutral-400">
-        Keine Dokumente vorhanden.
-      </p>
-    );
-  }
-
-  return (
-    <div className="space-y-2">
-      {documents.map((doc) => (
-        <div
-          key={doc.id}
-          className="flex items-center justify-between rounded-md border border-neutral-200 bg-white px-4 py-3"
-        >
-          <div className="flex items-center gap-3">
-            <FileText className="h-4 w-4 text-neutral-400" />
-            <div>
-              <p className="text-sm font-medium text-neutral-900">
-                {doc.title}
-              </p>
-              <div className="flex gap-2 text-xs text-neutral-400">
-                {doc.doc_type && <span>{doc.doc_type}</span>}
-                {doc.file_size && (
-                  <span>{(doc.file_size / 1024).toFixed(0)} KB</span>
-                )}
-              </div>
-            </div>
-          </div>
-          <a
-            href={`/api/documents/${doc.id}`}
-            className="text-sm text-neutral-500 hover:text-neutral-700"
-          >
-            Herunterladen
-          </a>
-        </div>
-      ))}
-    </div>
-  );
-}

frontend/src/components/documents/DocumentList.tsx

@@ -0,0 +1,144 @@
+"use client";
+
+import { useState } from "react";
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { FileText, Download, Trash2, Loader2 } from "lucide-react";
+import { format } from "date-fns";
+import { de } from "date-fns/locale";
+import { toast } from "sonner";
+import { api } from "@/lib/api";
+import type { Document } from "@/lib/types";
+
+const DOC_TYPE_BADGE: Record<string, string> = {
+  schriftsatz: "bg-blue-50 text-blue-700",
+  beschluss: "bg-violet-50 text-violet-700",
+  urteil: "bg-emerald-50 text-emerald-700",
+  gutachten: "bg-amber-50 text-amber-700",
+  vertrag: "bg-cyan-50 text-cyan-700",
+  korrespondenz: "bg-neutral-100 text-neutral-600",
+};
+
+interface DocumentListProps {
+  documents: Document[];
+  caseId: string;
+}
+
+export function DocumentList({ documents, caseId }: DocumentListProps) {
+  const [deleteId, setDeleteId] = useState<string | null>(null);
+  const queryClient = useQueryClient();
+
+  const deleteMutation = useMutation({
+    mutationFn: (docId: string) => api.delete(`/documents/${docId}`),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["case-documents", caseId] });
+      queryClient.invalidateQueries({ queryKey: ["case", caseId] });
+      toast.success("Dokument geloescht");
+      setDeleteId(null);
+    },
+    onError: (err) => {
+      const msg =
+        err && typeof err === "object" && "error" in err
+          ? (err as { error: string }).error
+          : "Unbekannter Fehler";
+      toast.error(`Fehler beim Loeschen: ${msg}`);
+      setDeleteId(null);
+    },
+  });
+
+  if (documents.length === 0) {
+    return (
+      <p className="py-8 text-center text-sm text-neutral-400">
+        Keine Dokumente vorhanden.
+      </p>
+    );
+  }
+
+  return (
+    <div className="space-y-2">
+      {documents.map((doc) => (
+        <div
+          key={doc.id}
+          className="flex items-center justify-between rounded-md border border-neutral-200 bg-white px-4 py-3"
+        >
+          <div className="flex items-center gap-3 min-w-0">
+            <FileText className="h-4 w-4 shrink-0 text-neutral-400" />
+            <div className="min-w-0">
+              <p className="truncate text-sm font-medium text-neutral-900">
+                {doc.title}
+              </p>
+              <div className="mt-0.5 flex flex-wrap items-center gap-2 text-xs text-neutral-400">
+                {doc.doc_type && (
+                  <span
+                    className={`rounded-full px-2 py-0.5 text-xs font-medium ${
+                      DOC_TYPE_BADGE[doc.doc_type.toLowerCase()] ??
+                      "bg-neutral-100 text-neutral-600"
+                    }`}
+                  >
+                    {doc.doc_type}
+                  </span>
+                )}
+                {doc.file_size != null && (
+                  <span>{formatFileSize(doc.file_size)}</span>
+                )}
+                <span>
+                  {format(new Date(doc.created_at), "d. MMM yyyy", {
+                    locale: de,
+                  })}
+                </span>
+              </div>
+            </div>
+          </div>
+
+          <div className="flex items-center gap-1 shrink-0 ml-3">
+            <a
+              href={`/api/documents/${doc.id}`}
+              className="rounded p-1.5 text-neutral-400 hover:bg-neutral-100 hover:text-neutral-600"
+              title="Herunterladen"
+            >
+              <Download className="h-4 w-4" />
+            </a>
+
+            {deleteId === doc.id ? (
+              <div className="flex items-center gap-1">
+                <button
+                  type="button"
+                  onClick={() => deleteMutation.mutate(doc.id)}
+                  disabled={deleteMutation.isPending}
+                  className="rounded px-2 py-1 text-xs font-medium text-red-600 hover:bg-red-50"
+                >
+                  {deleteMutation.isPending ? (
+                    <Loader2 className="h-3.5 w-3.5 animate-spin" />
+                  ) : (
+                    "Loeschen"
+                  )}
+                </button>
+                <button
+                  type="button"
+                  onClick={() => setDeleteId(null)}
+                  className="rounded px-2 py-1 text-xs text-neutral-500 hover:bg-neutral-100"
+                >
+                  Abbrechen
+                </button>
+              </div>
+            ) : (
+              <button
+                type="button"
+                onClick={() => setDeleteId(doc.id)}
+                className="rounded p-1.5 text-neutral-400 hover:bg-neutral-100 hover:text-red-500"
+                title="Loeschen"
+              >
+                <Trash2 className="h-4 w-4" />
+              </button>
+            )}
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+}
+
+function formatFileSize(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(0)} KB`;
+  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
+}

frontend/src/components/documents/DocumentUpload.tsx

@@ -0,0 +1,144 @@
+"use client";
+
+import { useCallback, useState } from "react";
+import { useDropzone } from "react-dropzone";
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { Upload, FileText, X, Loader2 } from "lucide-react";
+import { toast } from "sonner";
+import { api } from "@/lib/api";
+import type { Document } from "@/lib/types";
+
+interface DocumentUploadProps {
+  caseId: string;
+}
+
+export function DocumentUpload({ caseId }: DocumentUploadProps) {
+  const [files, setFiles] = useState<File[]>([]);
+  const queryClient = useQueryClient();
+
+  const uploadMutation = useMutation({
+    mutationFn: async (file: File) => {
+      const formData = new FormData();
+      formData.append("file", file);
+      formData.append("title", file.name);
+      return api.postFormData<Document>(`/cases/${caseId}/documents`, formData);
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["case-documents", caseId] });
+      queryClient.invalidateQueries({ queryKey: ["case", caseId] });
+    },
+  });
+
+  const onDrop = useCallback((acceptedFiles: File[]) => {
+    setFiles((prev) => [...prev, ...acceptedFiles]);
+  }, []);
+
+  const { getRootProps, getInputProps, isDragActive } = useDropzone({
+    onDrop,
+    disabled: uploadMutation.isPending,
+  });
+
+  function removeFile(index: number) {
+    setFiles((prev) => prev.filter((_, i) => i !== index));
+  }
+
+  async function handleUpload() {
+    if (files.length === 0) return;
+
+    let successCount = 0;
+    for (const file of files) {
+      try {
+        await uploadMutation.mutateAsync(file);
+        successCount++;
+      } catch (err) {
+        const msg =
+          err && typeof err === "object" && "error" in err
+            ? (err as { error: string }).error
+            : file.name;
+        toast.error(`Fehler beim Hochladen: ${msg}`);
+      }
+    }
+
+    if (successCount > 0) {
+      toast.success(
+        successCount === 1
+          ? "Dokument hochgeladen"
+          : `${successCount} Dokumente hochgeladen`,
+      );
+      setFiles([]);
+    }
+  }
+
+  return (
+    <div className="space-y-3">
+      <div
+        {...getRootProps()}
+        className={`cursor-pointer rounded-md border-2 border-dashed px-6 py-6 text-center transition-colors ${
+          isDragActive
+            ? "border-neutral-500 bg-neutral-50"
+            : "border-neutral-300 hover:border-neutral-400"
+        } ${uploadMutation.isPending ? "pointer-events-none opacity-50" : ""}`}
+      >
+        <input {...getInputProps()} />
+        <Upload className="mx-auto h-6 w-6 text-neutral-400" />
+        <p className="mt-2 text-sm text-neutral-600">
+          Dateien hierher ziehen oder{" "}
+          <span className="font-medium text-neutral-900">durchsuchen</span>
+        </p>
+        <p className="mt-1 text-xs text-neutral-400">Max. 50 MB pro Datei</p>
+      </div>
+
+      {files.length > 0 && (
+        <div className="space-y-2">
+          {files.map((file, i) => (
+            <div
+              key={`${file.name}-${i}`}
+              className="flex items-center gap-3 rounded-md border border-neutral-200 bg-neutral-50 px-3 py-2"
+            >
+              <FileText className="h-4 w-4 shrink-0 text-neutral-500" />
+              <div className="min-w-0 flex-1">
+                <p className="truncate text-sm text-neutral-900">{file.name}</p>
+                <p className="text-xs text-neutral-400">
+                  {formatFileSize(file.size)}
+                </p>
+              </div>
+              <button
+                type="button"
+                onClick={() => removeFile(i)}
+                disabled={uploadMutation.isPending}
+                className="rounded p-1 text-neutral-400 hover:bg-neutral-200 hover:text-neutral-600"
+              >
+                <X className="h-3.5 w-3.5" />
+              </button>
+            </div>
+          ))}
+
+          <button
+            type="button"
+            onClick={handleUpload}
+            disabled={uploadMutation.isPending}
+            className="inline-flex items-center gap-2 rounded-md bg-neutral-900 px-3 py-1.5 text-sm font-medium text-white hover:bg-neutral-800 disabled:opacity-50"
+          >
+            {uploadMutation.isPending ? (
+              <>
+                <Loader2 className="h-3.5 w-3.5 animate-spin" />
+                Hochladen...
+              </>
+            ) : (
+              <>
+                <Upload className="h-3.5 w-3.5" />
+                {files.length === 1 ? "Hochladen" : `${files.length} Dateien hochladen`}
+              </>
+            )}
+          </button>
+        </div>
+      )}
+    </div>
+  );
+}
+
+function formatFileSize(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(0)} KB`;
+  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
+}