feat: Add tests, update notes implementation

lib/features/document_details/cubit/document_details_cubit.dart

@@ -311,4 +311,17 @@ class DocumentDetailsCubit extends Cubit<DocumentDetailsState> {
     _notifier.removeListener(this);
     await super.close();
   }
+
+  Future<void> addNote(String text) async {
+    assert(state.status == LoadingStatus.loaded);
+    try {
+      final updatedDocument = await _api.addNote(
+        document: state.document!,
+        text: text,
+      );
+      _notifier.notifyUpdated(updatedDocument);
+    } on PaperlessApiException catch (err) {
+      addError(TransientPaperlessApiError(code: err.code));
+    }
+  }
 }

lib/features/document_details/view/widgets/add_note_page.dart

@@ -1,37 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
-import 'package:paperless_api/paperless_api.dart';
-import 'package:paperless_mobile/generated/l10n/app_localizations.dart';
-
-class AddNotePage extends StatefulWidget {
-  final DocumentModel document;
-
-  const AddNotePage({super.key, required this.document});
-
-  @override
-  State<AddNotePage> createState() => _AddNotePageState();
-}
-
-class _AddNotePageState extends State<AddNotePage> {
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: Text(S.of(context)!.addNote),
-      ),
-      body: Column(
-        children: [
-          TextField(
-            decoration: InputDecoration(
-              labelText: S.of(context)!.content,
-            ),
-          ),
-          ElevatedButton(
-            onPressed: () {},
-            child: Text(S.of(context)!.save),
-          ),
-        ],
-      ),
-    );
-  }
-}

lib/features/document_details/view/widgets/document_notes_widget.dart

@@ -8,18 +8,65 @@ import 'package:paperless_mobile/features/document_details/cubit/document_detail
 import 'package:paperless_mobile/generated/l10n/app_localizations.dart';
 import 'package:paperless_mobile/helpers/message_helpers.dart';
 
-class DocumentNotesWidget extends StatelessWidget {
+class DocumentNotesWidget extends StatefulWidget {
   final DocumentModel document;
   const DocumentNotesWidget({super.key, required this.document});
 
+  @override
+  State<DocumentNotesWidget> createState() => _DocumentNotesWidgetState();
+}
+
+class _DocumentNotesWidgetState extends State<DocumentNotesWidget> {
+  final _noteContentController = TextEditingController();
+  final _formKey = GlobalKey<FormState>();
+
   @override
   Widget build(BuildContext context) {
     return SliverMainAxisGroup(
       slivers: [
+        SliverToBoxAdapter(
+          child: Form(
+            key: _formKey,
+            child: Column(
+              children: [
+                TextFormField(
+                  controller: _noteContentController,
+                  maxLines: null,
+                  validator: (value) {
+                    if (value?.isEmpty ?? true) {
+                      return S.of(context)!.thisFieldIsRequired;
+                    }
+                    return null;
+                  },
+                  decoration: InputDecoration(
+                    hintText: 'Your note here...',
+                    labelText: 'New note',
+                    floatingLabelBehavior: FloatingLabelBehavior.always,
+                  ),
+                ).padded(),
+                Align(
+                  alignment: Alignment.centerRight,
+                  child: FilledButton.icon(
+                    icon: Icon(Icons.note_add_outlined),
+                    label: Text("Add note"),
+                    onPressed: () {
+                      _formKey.currentState?.save();
+                      if (_formKey.currentState?.validate() ?? false) {
+                        context
+                            .read<DocumentDetailsCubit>()
+                            .addNote(_noteContentController.text);
+                      }
+                    },
+                  ).padded(),
+                ),
+              ],
+            ).padded(),
+          ),
+        ),
         SliverList.separated(
           separatorBuilder: (context, index) => const SizedBox(height: 16),
           itemBuilder: (context, index) {
-            final note = document.notes.elementAt(index);
+            final note = widget.document.notes.elementAt(index);
             return Card(
               // borderRadius: BorderRadius.circular(8),
               // elevation: 1,
@@ -51,13 +98,6 @@ class DocumentNotesWidget extends StatelessWidget {
                   Row(
                     mainAxisAlignment: MainAxisAlignment.end,
                     children: [
-                      Spacer(),
-                      IconButton(
-                        icon: Icon(Icons.edit),
-                        onPressed: () {
-                          // Push edit page
-                        },
-                      ),
                       IconButton(
                         icon: Icon(Icons.delete),
                         onPressed: () {
@@ -74,7 +114,7 @@ class DocumentNotesWidget extends StatelessWidget {
               ).padded(16),
             );
           },
-          itemCount: document.notes.length,
+          itemCount: widget.document.notes.length,
         ),
       ],
     );

lib/features/document_details/view/widgets/edit_note_page.dart

@@ -1,15 +0,0 @@
-import 'package:flutter/material.dart';
-
-class EditNotePage extends StatefulWidget {
-  const EditNotePage({super.key});
-
-  @override
-  State<EditNotePage> createState() => _EditNotePageState();
-}
-
-class _EditNotePageState extends State<EditNotePage> {
-  @override
-  Widget build(BuildContext context) {
-    return const Placeholder();
-  }
-}