Can remove members from conversation

lib/helpers/conversations_helper.dart

@@ -49,6 +49,15 @@ class ConversationsHelper {
     return response.getObject()["conversationID"];
   }
 
+  /// Remove a member from a conversation.
+  ///
+  /// Throws in case of failure
+  static Future<void> removeMember(int convID, int userID) async =>
+      await APIRequest.withLogin("conversations/removeMember")
+          .addInt("convID", convID)
+          .addInt("userID", userID)
+          .execWithThrow();
+
   /// Update an existing conversation
   ///
   /// Throws in case of failure

lib/ui/screens/update_conversation_screen.dart

@@ -10,6 +10,7 @@ import 'package:comunic/ui/tiles/simple_user_tile.dart';
 import 'package:comunic/ui/widgets/async_screen_widget.dart';
 import 'package:comunic/ui/widgets/comunic_back_button_widget.dart';
 import 'package:comunic/ui/widgets/pick_user_widget.dart';
+import 'package:comunic/utils/account_utils.dart';
 import 'package:comunic/utils/color_utils.dart';
 import 'package:comunic/utils/dart_color.dart';
 import 'package:comunic/utils/intl_utils.dart';
@@ -21,7 +22,7 @@ import 'package:flutter/material.dart';
 ///
 /// @author Pierre HUBERT
 
-enum _MembersMenuChoices { REMOVE }
+enum _MembersMenuChoices { TOGGLE_ADMIN_STATUS, REMOVE }
 
 class UpdateConversationScreen extends StatefulWidget {
   final convID;
@@ -67,13 +68,17 @@ class _UpdateConversationScreen extends State<UpdateConversationScreen> {
   get _isValid => _members.length > 0;
 
   Future<void> _init() async {
-    if (!isUpdating) return;
+    if (!isUpdating) {
+      _admins.add(userID());
+      return;
+    }
+
     _conversation =
         await ConversationsHelper().getSingle(widget.convID, force: true);
 
     _nameController.text = _conversation.name ?? "";
     _colorController.text =
-        _conversationColor == null ? "" : "#${_conversation.color}";
+        _conversationColor == null ? "" : "#${colorToHex(_conversation.color)}";
     _members = await UsersHelper().getList(_conversation.membersID);
     _admins = _conversation.adminsID;
     _followConversation = _conversation.following;
@@ -172,29 +177,7 @@ class _UpdateConversationScreen extends State<UpdateConversationScreen> {
 
             //Conversation members
             Column(
-              children: _members
-                  .map((f) => SimpleUserTile(
-                        user: f,
-                        trailing: _canAddMembers
-                            ? PopupMenuButton<_MembersMenuChoices>(
-                                captureInheritedThemes: false,
-                                onSelected: (choice) =>
-                                    _membersMenuItemSelected(f, choice),
-                                itemBuilder: (c) =>
-                                    <PopupMenuEntry<_MembersMenuChoices>>[
-                                  PopupMenuItem(
-                                    child: Text(tr("Remove")),
-                                    value: _MembersMenuChoices.REMOVE,
-                                    enabled: isAdmin ||
-                                        (_canEveryoneAddMembers &&
-                                            !_conversation.membersID
-                                                .contains(f.id)),
-                                  )
-                                ],
-                              )
-                            : null,
-                      ))
-                  .toList(),
+              children: _members.map((f) => _buildMemberTile(f)).toList(),
             ),
           ],
         ),
@@ -202,6 +185,29 @@ class _UpdateConversationScreen extends State<UpdateConversationScreen> {
     );
   }
 
+  Widget _buildMemberTile(User user) => SimpleUserTile(
+        user: user,
+        subtitle: _admins.contains(user.id) ? tr("Admin") : tr("Member"),
+        trailing: _canAddMembers
+            ? PopupMenuButton<_MembersMenuChoices>(
+                captureInheritedThemes: false,
+                onSelected: (choice) => _membersMenuItemSelected(user, choice),
+                itemBuilder: (c) => <PopupMenuEntry<_MembersMenuChoices>>[
+                  PopupMenuItem(
+                    child: Text(tr("Toggle admin status")),
+                    value: _MembersMenuChoices.TOGGLE_ADMIN_STATUS,
+                    enabled: isUpdating && isAdmin && user.id != userID(),
+                  ),
+                  PopupMenuItem(
+                    child: Text(tr("Remove")),
+                    value: _MembersMenuChoices.REMOVE,
+                    enabled: isAdmin && user.id != userID(),
+                  ),
+                ],
+              )
+            : null,
+      );
+
   void _pickColor() async {
     final color = await showColorPickerDialog(context, _color);
     setState(() =>
@@ -212,10 +218,30 @@ class _UpdateConversationScreen extends State<UpdateConversationScreen> {
   void _membersMenuItemSelected(User user, _MembersMenuChoices choice) {
     if (choice == null) return;
 
-    if (choice == _MembersMenuChoices.REMOVE)
+    switch (choice) {
+      case _MembersMenuChoices.REMOVE:
+        _removeMember(user);
+        break;
+
+      case _MembersMenuChoices.TOGGLE_ADMIN_STATUS:
+        // TODO: Handle this case.
+        break;
+    }
+  }
+
+  void _removeMember(User user) async {
+    try {
+      if (isUpdating)
+        await ConversationsHelper.removeMember(_conversation.id, user.id);
+
       setState(() {
         _members.removeWhere((u) => u.id == user.id);
+        _admins.remove(user.id);
       });
+    } catch (e, s) {
+      logError(e, s);
+      snack(context, tr("Failed to remove member!"));
+    }
   }
 
   /// Submit the conversation

lib/ui/tiles/simple_user_tile.dart

@@ -14,9 +14,15 @@ class SimpleUserTile extends StatelessWidget {
   final User user;
   final OnUserTap onTap;
   final Widget trailing;
+  final String subtitle;
 
-  const SimpleUserTile({Key key, this.user, this.onTap, this.trailing})
-      : assert(user != null),
+  const SimpleUserTile({
+    Key key,
+    this.user,
+    this.onTap,
+    this.trailing,
+    this.subtitle,
+  })  : assert(user != null),
         super(key: key);
 
   @override
@@ -27,6 +33,7 @@ class SimpleUserTile extends StatelessWidget {
         user: user,
       ),
       title: Text(user.fullName),
+      subtitle: subtitle == null ? null : Text(subtitle),
       trailing: trailing,
     );
   }