Get and show the list of conversations

lib/enums/load_error_level.dart

@@ -0,0 +1,5 @@
+/// Load error level
+///
+/// @author Pierre HUBERT
+
+enum LoadErrorLevel {MINOR, MAJOR, NONE}

lib/helpers/api_helper.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:comunic/helpers/account_credentials_helper.dart';
 import 'package:comunic/models/api_request.dart';
 import 'package:comunic/models/api_response.dart';
 import 'package:comunic/models/config.dart';
@@ -23,7 +24,12 @@ class APIHelper {
       request.addString("serviceToken", config().serviceToken);
 
       //Add user tokens (if required)
-      if (request.needLogin) throw "Can add user tokens right now !";
+      if (request.needLogin) {
+        final tokens = await AccountCredentialsHelper().get();
+        assert(tokens != null);
+        request.addString("userToken1", tokens.tokenOne);
+        request.addString("userToken2", tokens.tokenTwo);
+      }
 
       // Prepare request body
       String requestBody = "";

lib/helpers/conversations_helper.dart

@@ -0,0 +1,36 @@
+import 'package:comunic/models/api_request.dart';
+import 'package:comunic/models/conversation.dart';
+
+/// Conversation helper
+///
+/// @author Pierre HUBERT
+
+class ConversationsHelper {
+  /// Download the list of conversations from the server
+  Future<List<Conversation>> downloadList() async {
+    final response =
+        await APIRequest(uri: "conversations/getList", needLogin: true).exec();
+
+    if (response.code != 200) return null;
+
+    try {
+      List<Conversation> list = List();
+      response.getArray().forEach((f) =>
+          list.add(Conversation(
+            id: f["ID"],
+            ownerID: f["ID_owner"],
+            lastActive: f["last_active"],
+            name: f["name"] == false ? null : f["name"],
+            following: f["following"] == 1,
+            sawLastMessage: f["saw_last_message"] == 1,
+            members: f["members"].map<int>((f) => int.parse(f)).toList(),
+          )));
+
+      return list;
+
+    } on Exception catch(e){
+      print(e.toString());
+      return null;
+    }
+  }
+}

lib/models/api_request.dart

@@ -1,3 +1,5 @@
+import 'package:comunic/helpers/api_helper.dart';
+import 'package:comunic/models/api_response.dart';
 import 'package:meta/meta.dart';
 
 /// API Request model
@@ -11,12 +13,11 @@ class APIRequest {
   final bool needLogin;
   Map<String, String> args;
 
-  APIRequest({
-    @required this.uri,
-    this.needLogin = false,
-  })  : assert(uri != null),
-        assert(needLogin != null),
-        args = Map();
+  APIRequest({@required this.uri, this.needLogin = false, this.args})
+      : assert(uri != null),
+        assert(needLogin != null) {
+    if (this.args == null) this.args = Map();
+  }
 
   void addString(String name, String value) => args[name] = value;
 
@@ -24,4 +25,7 @@ class APIRequest {
 
   void addBool(String name, bool value) =>
       args[name] = value ? "true" : "false";
+
+  /// Execute the request
+  Future<APIResponse> exec() async => APIHelper().exec(this);
 }

lib/models/conversation.dart

@@ -0,0 +1,30 @@
+import 'package:meta/meta.dart';
+
+/// Conversation model
+///
+/// @author Pierre HUBERT
+
+class Conversation {
+  final int id;
+  final int ownerID;
+  final int lastActive;
+  final String name;
+  final bool following;
+  final bool sawLastMessage;
+  final List<int> members;
+
+  const Conversation({
+    @required this.id,
+    @required this.ownerID,
+    @required this.lastActive,
+    @required this.name,
+    @required this.following,
+    @required this.sawLastMessage,
+    @required this.members,
+  })  : assert(id != null),
+        assert(ownerID != null),
+        assert(lastActive != null),
+        assert(following != null),
+        assert(sawLastMessage != null),
+        assert(members != null);
+}

lib/ui/routes/home_route.dart

@@ -1,3 +1,4 @@
+import 'package:comunic/ui/screens/conversations_screen.dart';
 import 'package:comunic/ui/screens/menus_screen.dart';
 import 'package:comunic/ui/tiles/CustomBottomNavigationBarItem.dart';
 import 'package:flutter/material.dart';
@@ -48,7 +49,7 @@ class _HomeRouteState extends State<HomeRoute> {
   Widget _buildBody(BuildContext context) {
     switch (_currTab) {
       case 0:
-        return Text("Conversations");
+        return ConversationsScreen();
 
       case 1:
         return MenuScreen();

lib/ui/screens/conversations_screen.dart

@@ -0,0 +1,87 @@
+import 'package:comunic/enums/load_error_level.dart';
+import 'package:comunic/helpers/conversations_helper.dart';
+import 'package:comunic/models/conversation.dart';
+import 'package:comunic/ui/tiles/conversation_tile.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:comunic/utils/ui_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Conversations screen
+///
+/// @author Pierre HUBERT
+
+class ConversationsScreen extends StatefulWidget {
+  @override
+  State<StatefulWidget> createState() => _ConversationScreenState();
+}
+
+class _ConversationScreenState extends State<ConversationsScreen> {
+  final ConversationsHelper _conversationsHelper = ConversationsHelper();
+  List<Conversation> _list;
+  LoadErrorLevel _error = LoadErrorLevel.NONE;
+  bool _loading = true;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    _loadConversations();
+  }
+
+  void setError(LoadErrorLevel err) => setState(() => _error = err);
+
+  void setLoading(bool loading) => setState(() => _loading = loading);
+
+  void gotLoadingError() {
+    setLoading(false);
+    setError(_list == null ? LoadErrorLevel.MAJOR : LoadErrorLevel.MINOR);
+  }
+
+  /// Load the list of conversations
+  Future<void> _loadConversations() async {
+    setError(LoadErrorLevel.NONE);
+    setLoading(true);
+
+    final list = await _conversationsHelper.downloadList();
+
+    if (list == null) return gotLoadingError();
+
+    //Save list
+    _list = list;
+
+    setLoading(false);
+  }
+
+  /// Build an error card
+  Widget _buildErrorCard() {
+    return buildErrorCard(
+      tr("Could not retrieve the list of conversations!"),
+      actions: <Widget>[
+        FlatButton(
+          onPressed: _loadConversations,
+          child: Text(
+            tr("Retry").toUpperCase(),
+            style: TextStyle(
+              color: Colors.white,
+            ),
+          ),
+        )
+      ],
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_error == LoadErrorLevel.MAJOR) return _buildErrorCard();
+    if (_list == null) return buildCenteredProgressBar();
+
+    // Show the list of conversations
+    return ListView.builder(
+      itemBuilder: (context, index) {
+        return ConversationTile(
+          conversation: _list.elementAt(index),
+        );
+      },
+      itemCount: _list.length,
+    );
+  }
+}

lib/ui/tiles/conversation_tile.dart

@@ -0,0 +1,55 @@
+import 'package:comunic/models/conversation.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Single conversation tile
+///
+/// @author Pierre HUBERT
+
+class ConversationTile extends StatelessWidget {
+  final Conversation conversation;
+
+  const ConversationTile({Key key, this.conversation}) : super(key: key);
+
+  _buildSubInformation(IconData icon, String content) {
+    return Row(
+      children: <Widget>[
+        Icon(
+          icon,
+          size: 15.0,
+          color: Colors.grey,
+        ),
+        Text(" " + content),
+      ],
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      title: Text(conversation.name == null ? "Unknown" : conversation.name),
+      leading: Icon(
+        conversation.sawLastMessage ? Icons.check_circle : Icons.lens,
+        color: conversation.sawLastMessage ? null : Colors.blue,
+      ),
+      isThreeLine: true,
+      subtitle: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: <Widget>[
+          _buildSubInformation(Icons.access_time, "time"), //TODO : improve the way the time is shown
+          _buildSubInformation(
+            Icons.group,
+            conversation.members.length == 1
+                ? tr("1 member")
+                : tr(
+                    "%num% members",
+                    args: {
+                      "num": conversation.members.length.toString(),
+                    },
+                  ),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/utils/intl_utils.dart

@@ -5,7 +5,15 @@
 /// Translate a string
 ///
 /// Translate a given [string] into the current language, if available
-String tr(String string) {
+///
+/// Then apply the list of [args] to the string, each argument name is
+/// surrounded by '%'
+String tr(String string, {Map<String, String> args}) {
   //TODO : create translation system
+
+  //Apply arguments
+  if(args != null)
+    args.forEach((key, value) => string = string.replaceAll("%$key%", value));
+
   return string;
-}
+}

lib/utils/ui_utils.dart

@@ -18,7 +18,7 @@ Widget buildLoadingPage() {
 }
 
 /// Build and return an error card
-Widget buildErrorCard(String message) {
+Widget buildErrorCard(String message, {List<Widget> actions}) {
   return Card(
     elevation: 2.0,
     color: Colors.red,
@@ -39,6 +39,9 @@ Widget buildErrorCard(String message) {
               style: TextStyle(color: Colors.white),
               maxLines: null,
             ),
+          ),
+          Row(
+            children: actions == null ? <Widget>[] : actions,
           )
         ],
       ),