Can create countdown timers

lib/helpers/posts_helper.dart

@@ -153,6 +153,11 @@ class PostsHelper {
                 type: MediaType.parse("application/pdf")));
         break;
 
+      case PostKind.COUNTDOWN:
+        request.addInt(
+            "time-end", (post.timeEnd.millisecondsSinceEpoch / 1000).floor());
+        break;
+
       default:
         throw Exception("Unsupported post type :" + post.kind.toString());
         break;

lib/models/new_post.dart

@@ -17,6 +17,7 @@ class NewPost {
   final File image;
   final List<int> pdf;
   final PostKind kind;
+  final DateTime timeEnd;
 
   const NewPost({
     @required this.target,
@@ -26,11 +27,13 @@ class NewPost {
     @required this.kind,
     @required this.image,
     @required this.pdf,
+    @required this.timeEnd,
   })  : assert(target != null),
         assert(targetID != null),
         assert(visibility != null),
         assert(content != null),
         assert(kind != PostKind.TEXT || content.length > 3),
         assert(kind != PostKind.IMAGE || image != null),
-        assert(kind != PostKind.PDF || pdf != null);
+        assert(kind != PostKind.PDF || pdf != null),
+        assert(kind != PostKind.COUNTDOWN || timeEnd != null);
 }

lib/ui/widgets/post_create_form_widget.dart

@@ -49,11 +49,14 @@ class _PostCreateFormWidgetState extends State<PostCreateFormWidget> {
   PostVisibilityLevel _postVisibilityLevel;
   File _postImage;
   List<int> _postPDF;
+  DateTime _timeEnd;
 
   bool get hasImage => _postImage != null;
 
   bool get hasPDF => _postPDF != null;
 
+  bool get hasTimeEnd => _timeEnd != null;
+
   bool get canSubmitForm =>
       !_isCreating && _postTextController.text.length > 5 ||
       postKind != PostKind.TEXT;
@@ -63,6 +66,8 @@ class _PostCreateFormWidgetState extends State<PostCreateFormWidget> {
       return PostKind.IMAGE;
     else if (hasPDF)
       return PostKind.PDF;
+    else if (hasTimeEnd)
+      return PostKind.COUNTDOWN;
     else
       return PostKind.TEXT;
   }
@@ -116,6 +121,13 @@ class _PostCreateFormWidgetState extends State<PostCreateFormWidget> {
                 onTap: _pickPDFForPost,
               ),
 
+              // Add countdown timer
+              _PostOptionWidget(
+                icon: Icons.timer,
+                selected: postKind == PostKind.COUNTDOWN,
+                onTap: _pickCountdownTime,
+              ),
+
               Expanded(
                 child: Container(),
               ),
@@ -174,6 +186,7 @@ class _PostCreateFormWidgetState extends State<PostCreateFormWidget> {
     setState(() {
       _postImage = null;
       _postPDF = null;
+      _timeEnd = null;
     });
   }
 
@@ -211,6 +224,41 @@ class _PostCreateFormWidgetState extends State<PostCreateFormWidget> {
     }
   }
 
+  /// Pick countdown time
+  Future<void> _pickCountdownTime() async {
+    final initialDate =
+        _timeEnd == null ? DateTime.now().add(Duration(minutes: 1)) : _timeEnd;
+
+    // Pick date
+    final newDate = await showDatePicker(
+        context: context,
+        initialDate: initialDate,
+        firstDate: DateTime.now(),
+        lastDate: DateTime.now().add(Duration(days: 5000)));
+
+    if (newDate == null) return;
+
+    // Pick time
+    final newTime = await showTimePicker(
+      context: context,
+      initialTime: TimeOfDay.fromDateTime(initialDate),
+    );
+
+    if (newTime == null) return;
+
+    // Apply new selection
+    _resetPostSelection();
+    setState(() {
+      _timeEnd = newDate.add(Duration(
+          hours: newTime.hour - newDate.hour,
+          minutes: newTime.minute - newDate.minute));
+
+      print(newDate.toString());
+      print(newTime);
+      print(_timeEnd);
+    });
+  }
+
   /// Submit new post
   Future<void> _submitForm() async {
     if (!canSubmitForm)
@@ -227,6 +275,7 @@ class _PostCreateFormWidgetState extends State<PostCreateFormWidget> {
         kind: postKind,
         image: _postImage,
         pdf: _postPDF,
+        timeEnd: _timeEnd,
       ));
       setState(() => _isCreating = false);