feat(post): Support edit and save draft

* Recognize editing draft.
* Save draft as draft (without publishing).

lib/features/post/bloc/post_edit_bloc.dart

@@ -77,6 +77,7 @@ final class PostEditBloc extends Bloc<PostEditEvent, PostEditState>
       threadType: event.threadType?.typeID,
       threadTitle: event.threadTitle,
       data: event.data,
+      save: event.save,
       options: Map.fromEntries(
         event.options
             .where((e) => !e.disabled && e.checked)

lib/features/post/bloc/post_edit_event.dart

@@ -36,6 +36,7 @@ final class PostEditCompleteEditRequested extends PostEditEvent
     required this.threadTitle,
     required this.data,
     required this.options,
+    required this.save,
   }) : super();
 
   /// Form hash.
@@ -81,6 +82,11 @@ final class PostEditCompleteEditRequested extends PostEditEvent
 
   /// Additional options provided by server.
   final List<PostEditContentOption> options;
+
+  /// Save post as draft or publish as new thread.
+  ///
+  /// Only set to "1" when editing thread in draft state.
+  final String save;
 }
 
 /// Fetch required info for publishing, including form hash, post time and more.

lib/features/post/models/post_edit_type.dart

@@ -6,11 +6,19 @@ enum PostEditType {
   newThread,
 
   /// Edit an existing post.
-  editPost;
+  editPost,
+
+  /// Editing a thread that still in draft state (not published yet).
+  ///
+  /// This type is similar to [newThread] and [editPost], only on editing the
+  /// first floor post, fetch info like [editPost] but have save-as-draft
+  /// action.
+  editDraft;
 
   /// Check whether the edit type is editing something.
   bool get isEditingPost => this == editPost;
 
   /// Check whether the edit type is writing new thread.
-  bool get isDraftingNewThread => this == PostEditType.newThread;
+  bool get isEditingDraft =>
+      this == PostEditType.newThread || this == PostEditType.editDraft;
 }

lib/features/post/repository/post_edit_repository.dart

@@ -57,6 +57,7 @@ final class PostEditRepository with LoggerMixin {
     required String? threadTitle,
     required String data,
     required Map<String, String> options,
+    required String save,
   }) =>
       AsyncVoidEither(() async {
         final body = <String, String>{
@@ -72,7 +73,7 @@ final class PostEditRepository with LoggerMixin {
           'subject': threadTitle ?? '',
           'message': data,
           'editsubmit': 'true',
-          'save': '',
+          'save': save,
         };
         if (threadType != null) {
           body['typeid'] = threadType;

lib/features/post/view/post_edit_page.dart

@@ -111,14 +111,6 @@ class PostEditPage extends StatefulWidget {
   /// Post id of the post.
   final String? pid;
 
-  static String _formatDataUrl({
-    required String fid,
-    required String tid,
-    required String pid,
-  }) {
-    return '$baseUrl/forum.php?mod=post&action=edit&fid=$fid&tid=$tid&pid=$pid';
-  }
-
   @override
   State<PostEditPage> createState() => _PostEditPageState();
 }
@@ -184,12 +176,20 @@ class _PostEditPageState extends State<PostEditPage> with LoggerMixin {
   /// * Editing thread draft.
   _UploadMethod uploadMethod = _UploadMethod.notYet;
 
+  static String _formatDataUrl({
+    required String fid,
+    required String tid,
+    required String pid,
+  }) {
+    return '$baseUrl/forum.php?mod=post&action=edit&fid=$fid&tid=$tid&pid=$pid';
+  }
+
   Future<void> _onFinish(
     BuildContext context,
     PostEditState state, {
     bool saveDraft = false,
   }) async {
-    if (widget.editType.isDraftingNewThread) {
+    if (widget.editType.isEditingDraft) {
       final tr = context.t.postEditPage.threadPublish;
       final ret = await showQuestionDialog(
         context: context,
@@ -230,7 +230,9 @@ class _PostEditPageState extends State<PostEditPage> with LoggerMixin {
     }
 
     final event = switch (widget.editType) {
-      PostEditType.editPost => PostEditCompleteEditRequested(
+      PostEditType.editPost ||
+      PostEditType.editDraft =>
+        PostEditCompleteEditRequested(
           formHash: state.content!.formHash,
           postTime: state.content!.postTime,
           delattachop: state.content?.delattachop ?? '0',
@@ -245,6 +247,7 @@ class _PostEditPageState extends State<PostEditPage> with LoggerMixin {
           threadTitle: threadTitleController.text,
           data: bbcodeController.toBBCode(),
           options: additionalOptionsMap?.values.toList() ?? [],
+          save: saveDraft ? '1' : '',
         ),
       PostEditType.newThread => ThreadPubPostThread(
           ThreadPublishInfo(
@@ -441,7 +444,7 @@ class _PostEditPageState extends State<PostEditPage> with LoggerMixin {
               : null,
         ),
         const Spacer(),
-        if (widget.editType.isDraftingNewThread) ...[
+        if (widget.editType.isEditingDraft) ...[
           FilledButton.tonal(
             onPressed: state.status == PostEditStatus.uploading
                 ? null
@@ -491,8 +494,10 @@ class _PostEditPageState extends State<PostEditPage> with LoggerMixin {
             );
 
             final event = switch (widget.editType) {
-              PostEditType.editPost => PostEditLoadDataRequested(
-                  PostEditPage._formatDataUrl(
+              PostEditType.editPost ||
+              PostEditType.editDraft =>
+                PostEditLoadDataRequested(
+                  _formatDataUrl(
                     fid: widget.fid,
                     tid: widget.tid!,
                     pid: widget.pid!,
@@ -518,10 +523,10 @@ class _PostEditPageState extends State<PostEditPage> with LoggerMixin {
             if (state.status == PostEditStatus.failedToLoad) {
               return buildRetryButton(context, () {
                 switch (widget.editType) {
-                  case PostEditType.editPost:
+                  case PostEditType.editPost || PostEditType.editDraft:
                     context.read<PostEditBloc>().add(
                           PostEditLoadDataRequested(
-                            PostEditPage._formatDataUrl(
+                            _formatDataUrl(
                               fid: widget.fid,
                               // Not null when editing post
                               tid: widget.tid!,
@@ -585,7 +590,7 @@ class _PostEditPageState extends State<PostEditPage> with LoggerMixin {
         );
         context.pop();
         return;
-      } else if (widget.editType.isDraftingNewThread) {
+      } else if (widget.editType.isEditingDraft) {
         // Writing new post.
         //
         // Ask for a redirect to just published thread page.
@@ -658,7 +663,9 @@ class _PostEditPageState extends State<PostEditPage> with LoggerMixin {
   Widget build(BuildContext context) {
     final title = switch (widget.editType) {
       PostEditType.newThread => context.t.postEditPage.newThreadTitle,
-      PostEditType.editPost => context.t.postEditPage.editPostTitle,
+      PostEditType.editPost ||
+      PostEditType.editDraft =>
+        context.t.postEditPage.editPostTitle,
     };
     return PopScope(
       canPop: false,

lib/shared/models/post.dart

@@ -28,6 +28,7 @@ class Post with PostMappable {
     required this.lastEditTime,
     required this.shareLink,
     required this.page,
+    required this.isDraft,
     this.locked = const [],
     this.rate,
     this.packetUrl,
@@ -102,6 +103,12 @@ class Post with PostMappable {
   /// Current page number.
   final int page;
 
+  /// Flag indicating whether the post is in draft state.
+  ///
+  /// Draft post only can be a first floor, equivalent to editing a thread that
+  /// not published yet.
+  final bool isDraft;
+
   /// Build [Post] from [element] that has attribute id "post_$postID".
   static Post? fromPostNode(uh.Element element, int page) {
     final trRootNode = element.querySelector('table > tbody > tr');
@@ -281,6 +288,8 @@ class Post with PostMappable {
       talker.error('post $postID: user profile node not found');
     }
 
+    final isDraft = element.querySelector('a.psave') != null;
+
     return Post(
       postID: postID,
       postFloor: postFloor,
@@ -298,6 +307,7 @@ class Post with PostMappable {
       userBriefProfile: userBriefProfile,
       shareLink: shareLink,
       page: page,
+      isDraft: isDraft,
     );
   }
 

lib/widgets/card/post_card/post_card.dart

@@ -6,6 +6,7 @@ import 'package:go_router/go_router.dart';
 import 'package:tsdm_client/constants/layout.dart';
 import 'package:tsdm_client/extensions/build_context.dart';
 import 'package:tsdm_client/extensions/date_time.dart';
+import 'package:tsdm_client/features/post/models/models.dart';
 import 'package:tsdm_client/features/thread/bloc/thread_bloc.dart';
 import 'package:tsdm_client/i18n/strings.g.dart';
 import 'package:tsdm_client/routes/screen_paths.dart';
@@ -325,7 +326,21 @@ class _PostCardState extends State<PostCard>
                 // not-null author uid.
                 context.read<ThreadBloc>().add(ThreadViewAllAuthorsRequested());
               case _PostCardActions.edit:
-                await context.dispatchAsUrl(widget.post.editUrl!);
+                final url = Uri.parse(widget.post.editUrl!);
+                final editType = widget.post.isDraft
+                    ? PostEditType.editDraft.index
+                    : PostEditType.editPost.index;
+                await context.pushNamed(
+                  ScreenPaths.editPost,
+                  pathParameters: {
+                    'editType': '$editType',
+                    'fid': '${url.queryParameters["fid"]}',
+                  },
+                  queryParameters: {
+                    'tid': '${url.queryParameters["tid"]}',
+                    'pid': '${url.queryParameters["pid"]}',
+                  },
+                );
               case _PostCardActions.share:
                 await copyToClipboard(context, widget.post.shareLink!);
             }