feat: honestly forgot

<

@@ -0,0 +1,46 @@
+import 'package:provider/provider.dart';
+
+enum State { pending, ongoing, ended }
+
+class Bal {
+  Bal({
+    required this.id,
+    required this.name,
+    required this.state,
+    required this.startTime,
+    required this.endTime,
+  });
+
+  int id;
+  String name;
+  State state;
+  DateTime startTime;
+  DateTime endTime;
+
+  factory Bal.fromJSON(Map<String, dynamic> json) => Bal(
+    id: json["id"],
+    name: json["name"],
+    state: switch (json["state"]) {
+      "Pending" => State.pending,
+      "Ongoing" => State.ongoing,
+      _ => State.ended,
+    },
+    startTime: DateTime.fromMillisecondsSinceEpoch(
+      json["start_timestamp"] * 1000,
+      isUtc: true,
+    ),
+    endTime: DateTime.fromMillisecondsSinceEpoch(
+      json["end_timestamp"] * 1000,
+      isUtc: true,
+    ),
+  );
+
+  int compareTo(Bal other) {
+    if (ended == other.ended) {
+      return 0;
+    } else if (ended) {
+      return 1;
+    }
+    return -1;
+  }
+}

lib/config/dependencies.dart

@@ -1,6 +1,7 @@
 import "package:provider/provider.dart";
 import "package:provider/single_child_widget.dart";
 import "package:seshat/data/repositories/auth_repository.dart";
+import "package:seshat/data/repositories/bal_repository.dart";
 import "package:seshat/data/repositories/book_instance_repository.dart";
 import "package:seshat/data/repositories/book_repository.dart";
 
@@ -25,5 +26,6 @@ List<SingleChildWidget> get providers {
     Provider(
       create: (context) => BookInstanceRepository(apiClient: context.read()),
     ),
+    Provider(create: (context) => BalRepository(apiClient: context.read())),
   ];
 }

lib/data/repositories/bal_repository.dart

@@ -0,0 +1,51 @@
+import 'package:seshat/data/services/api_client.dart';
+import 'package:seshat/domain/models/bal.dart';
+import 'package:seshat/utils/result.dart';
+
+class BalRepository {
+  BalRepository({required ApiClient apiClient}) : _apiClient = apiClient;
+
+  final ApiClient _apiClient;
+  List<Bal>? _bals;
+
+  Future<Result<List<Bal>>> getBals() async {
+    if (_bals != null) {
+      return Result.ok(_bals!);
+    }
+    final result = await _apiClient.getBals();
+    switch (result) {
+      case Ok():
+        _bals = result.value;
+        return Result.ok(result.value);
+      case Error():
+        return result;
+    }
+  }
+
+  Future<Result<Bal>> balById(int id) async {
+    if (_bals == null) {
+      await getBals();
+    }
+    Bal? bal = _bals!.where((bal) => bal.id == id).firstOrNull;
+    if (bal != null) {
+      return Result.ok(bal);
+    }
+    final result = await _apiClient.getBalById(id);
+    switch (result) {
+      case Ok():
+        return Result.ok(result.value);
+      case Error():
+        return result;
+    }
+  }
+
+  Future<Result<void>> addBal(String name) async {
+    final result = await _apiClient.addBal(name);
+    switch (result) {
+      case Ok():
+        return result;
+      case Error():
+        return result;
+    }
+  }
+}

lib/data/services/api_client.dart

@@ -1,5 +1,6 @@
 import 'dart:convert';
 
+import 'package:flutter/widgets.dart';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:http/http.dart';
 import 'package:seshat/config/constants.dart';
@@ -35,6 +36,106 @@ class ApiClient {
     return headers;
   }
 
+  /*
+ * =================
+ * =====[ BAL ]=====
+ * =================
+*/
+
+  Future<Result<Bal>> getBalById(int id) async {
+    final client = Client();
+    try {
+      final headers = await _getHeaders();
+      final response = await client.get(
+        Uri.parse("https://$apiBasePath/bal/${id.toString()}"),
+        headers: headers,
+      );
+      if (response.statusCode == 200) {
+        final json = jsonDecode(response.body);
+        return Result.ok(Bal.fromJSON(json));
+      } else if (response.statusCode == 403) {
+        return Result.error(Exception("You don't own the specified bal"));
+      } else {
+        return Result.error(
+          Exception("No bal wirth this id exists the database"),
+        );
+      }
+    } catch (e) {
+      return Result.error(Exception(e));
+    } finally {
+      client.close();
+    }
+  }
+
+  Future<Result<Bal>> addBal(String name) async {
+    final client = Client();
+    try {
+      final headers = await _getHeaders({"Content-Type": "application/json"});
+      final body = {"name": name};
+      final response = await client.post(
+        Uri.parse("https://$apiBasePath/bal"),
+        headers: headers,
+        body: jsonEncode(body),
+      );
+      if (response.statusCode == 201) {
+        final json = jsonDecode(response.body);
+        return Result.ok(Bal.fromJSON(json));
+      } else {
+        return Result.error(Exception("Something went wrong"));
+      }
+    } catch (e) {
+      debugPrint("\n\n\n\n${e.toString()}\n\n\n\n");
+      return Result.error(Exception(e));
+    } finally {
+      client.close();
+    }
+  }
+
+  Future<Result<List<Bal>>> getBals() async {
+    final client = Client();
+    try {
+      final headers = await _getHeaders();
+      final response = await client.get(
+        Uri.parse("https://$apiBasePath/bals"),
+        headers: headers,
+      );
+      if (response.statusCode == 200) {
+        final json = jsonDecode(response.body) as List<dynamic>;
+        debugPrint("\n\n\n\nRECEIVED $json\n\n\n\n");
+        return Result.ok(json.map((element) => Bal.fromJSON(element)).toList());
+      } else {
+        return Result.error(Exception("Something wrong happened"));
+      }
+    } catch (e) {
+      return Result.error(Exception(e));
+    } finally {
+      client.close();
+    }
+  }
+
+  Future<Result<Bal?>> getCurrentBal() async {
+    final client = Client();
+    try {
+      final headers = await _getHeaders();
+      final response = await client.get(
+        Uri.parse("https://$apiBasePath/bal/current"),
+        headers: headers,
+      );
+      if (response.statusCode == 200) {
+        final json = jsonDecode(response.body);
+        return Result.ok(Bal.fromJSON(json));
+      } else if (response.statusCode == 404) {
+        return Result.ok(null);
+      } else {
+        return Result.error(Exception("Something went wrong"));
+      }
+    } catch (e) {
+      return Result.error(Exception(e));
+    } finally {
+      client.close();
+    }
+  }
+
   /*
  * ===================
  * =====[ BOOKS ]=====

lib/domain/models/bal.dart

@@ -1,5 +1,44 @@
+enum BalState { pending, ongoing, ended }
+
 class Bal {
-  Bal({required this.id});
+  Bal({
+    required this.id,
+    required this.name,
+    required this.state,
+    required this.startTime,
+    required this.endTime,
+  });
 
   int id;
+  String name;
+  BalState state;
+  DateTime startTime;
+  DateTime endTime;
+
+  factory Bal.fromJSON(Map<String, dynamic> json) => Bal(
+    id: json["id"],
+    name: json["name"],
+    state: switch (json["state"]) {
+      "Pending" => BalState.pending,
+      "Ongoing" => BalState.ongoing,
+      _ => BalState.ended,
+    },
+    startTime: DateTime.fromMillisecondsSinceEpoch(
+      json["start_timestamp"] * 1000,
+      isUtc: true,
+    ),
+    endTime: DateTime.fromMillisecondsSinceEpoch(
+      json["end_timestamp"] * 1000,
+      isUtc: true,
+    ),
+  );
+
+  int compareTo(Bal other) {
+    if (state.index == other.state.index) {
+      return 0;
+    } else if (state.index > other.state.index) {
+      return state.index;
+    }
+    return -state.index;
+  }
 }

lib/routing/router.dart

@@ -6,7 +6,10 @@ import 'package:seshat/ui/add_page/view_model/add_view_model.dart';
 import 'package:seshat/ui/add_page/widgets/add_page.dart';
 import 'package:seshat/ui/auth/viewmodel/login_view_model.dart';
 import 'package:seshat/ui/auth/widgets/login_page.dart';
-import 'package:seshat/ui/home_page/home_page.dart';
+import 'package:seshat/ui/bal_page/view_model/bal_view_model.dart';
+import 'package:seshat/ui/bal_page/widget/bal_screen.dart';
+import 'package:seshat/ui/home_page/view_model/home_view_model.dart';
+import 'package:seshat/ui/home_page/widgets/home_page.dart';
 import 'package:seshat/ui/sell_page/view_model/sell_view_model.dart';
 import 'package:seshat/ui/sell_page/widgets/sell_page.dart';
 
@@ -30,8 +33,22 @@ GoRouter router(AuthRepository authRepository) => GoRouter(
   routes: [
     GoRoute(
       path: Routes.home,
-      pageBuilder: (context, state) => NoTransitionPage(child: HomePage()),
+      pageBuilder: (context, state) {
+        final viewModel = HomeViewModel(balRepository: context.read());
+        return NoTransitionPage(child: HomePage(viewModel: viewModel));
+      },
       routes: [
+        GoRoute(
+          path: Routes.balPage,
+          name: "bal",
+          pageBuilder: (context, state) {
+            final viewModel = BalViewModel(
+              balRepository: context.read(),
+              id: int.tryParse(state.pathParameters["id"] ?? ""),
+            );
+            return NoTransitionPage(child: BalScreen(viewModel: viewModel));
+          },
+        ),
         GoRoute(
           path: Routes.add,
           pageBuilder: (context, state) {
@@ -39,6 +56,7 @@ GoRouter router(AuthRepository authRepository) => GoRouter(
               ownerRepository: context.read(),
               bookRepository: context.read(),
               bookInstanceRepository: context.read(),
+              balRepository: context.read(),
             );
             return NoTransitionPage(child: AddPage(viewModel: viewModel));
           },
@@ -51,7 +69,7 @@ GoRouter router(AuthRepository authRepository) => GoRouter(
         GoRoute(
           path: Routes.sell,
           pageBuilder: (context, state) {
-            final viewModel = SellViewModel();
+            final viewModel = SellViewModel(balRepository: context.read());
             return NoTransitionPage(child: SellPage(viewModel: viewModel));
           },
         ),

lib/routing/routes.dart

@@ -1,6 +1,7 @@
 abstract final class Routes {
   // ==[ HOME ]==
   static const home = '/';
+  static const balPage = '/bal/:id';
 
   // ==[ ADD ]==
   static const add = '/add';

lib/ui/add_page/view_model/add_view_model.dart

@@ -3,6 +3,7 @@ import 'dart:async';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:seshat/data/repositories/bal_repository.dart';
 import 'package:seshat/data/repositories/book_instance_repository.dart';
 import 'package:seshat/data/repositories/book_repository.dart';
 import 'package:seshat/data/repositories/owner_repository.dart';
@@ -18,16 +19,18 @@ class AddViewModel extends ChangeNotifier {
     required OwnerRepository ownerRepository,
     required BookRepository bookRepository,
     required BookInstanceRepository bookInstanceRepository,
+    required BalRepository balRepository,
   }) : _ownerRepository = ownerRepository,
        _bookRepository = bookRepository,
-       _bookInstanceRepository = bookInstanceRepository {
+       _bookInstanceRepository = bookInstanceRepository,
+       _balRepository = balRepository {
     load = Command0(_load)..execute();
   }
 
   final OwnerRepository _ownerRepository;
   final BookRepository _bookRepository;
   final BookInstanceRepository _bookInstanceRepository;
-  late final StreamSubscription sub;
+  final BalRepository _balRepository;
 
   /*
  * ====================
@@ -73,6 +76,15 @@ class AddViewModel extends ChangeNotifier {
     }
   }
 
+  /*
+ * =================
+ * =====[ BAL ]=====
+ * =================
+*/
+
+  Bal? _currentBal;
+  Bal? get currentBal => _currentBal;
+
   /*
  * ===================
  * =====[ PRICE ]=====
@@ -109,11 +121,6 @@ class AddViewModel extends ChangeNotifier {
     return await _bookInstanceRepository.sendBook(book, owner, bal, price);
   }
 
-  /// Sends an api request with
-  // Result<BookInstance> newBookInstance() {
-
-  // };
-
   /*
  * =================================
  * =====[ COMMAND AND LOADING ]=====
@@ -124,7 +131,32 @@ class AddViewModel extends ChangeNotifier {
   bool isLoaded = false;
 
   Future<Result<void>> _load() async {
-    return await _loadOwners();
+    final result1 = await _loadOwners();
+    switch (result1) {
+      case Error():
+        return result1;
+      default:
+        break;
+    }
+    final result2 = await _loadBal();
+    isLoaded = true;
+    notifyListeners();
+    return result2;
+  }
+
+  Future<Result<void>> _loadBal() async {
+    final result = await _balRepository.getBals();
+    switch (result) {
+      case Ok():
+        _currentBal = result.value
+            .where((bal) => bal.state == BalState.ongoing)
+            .firstOrNull;
+        break;
+      case Error():
+        break;
+    }
+
+    return result;
   }
 
   Future<Result<void>> _loadOwners() async {
@@ -137,18 +169,10 @@ class AddViewModel extends ChangeNotifier {
               "${b.firstName} ${b.lastName}",
             ),
           );
-        isLoaded = true;
       case Error():
         break;
     }
-    notifyListeners();
 
     return result;
   }
-
-  @override
-  void dispose() {
-    sub.cancel();
-    super.dispose();
-  }
 }

lib/ui/add_page/widgets/add_page.dart

@@ -1,7 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/svg.dart';
+import 'package:go_router/go_router.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
 import 'package:seshat/domain/models/book.dart';
+import 'package:seshat/routing/routes.dart';
 import 'package:seshat/ui/add_page/view_model/add_view_model.dart';
 import 'package:seshat/ui/add_page/widgets/form_popup.dart';
 import 'package:seshat/ui/add_page/widgets/owner_popup.dart';
@@ -36,133 +38,163 @@ class _AddPageState extends State<AddPage> {
         listenable: widget.viewModel,
         builder: (context, child) => switch (widget.viewModel.isLoaded) {
           false => Center(child: CircularProgressIndicator()),
-          true => Stack(
+          true => switch (widget.viewModel.currentBal) {
-            children: [
+            null => Center(
-              ColoredBox(color: Colors.black),
+              child: SizedBox(
-              MobileScanner(
+                width: 300,
-                controller: controller,
-                onDetect: (barcodes) async {
-                  if (widget.viewModel.currentOwner == null) {
-                    ScaffoldMessenger.of(context).showSnackBar(
-                      SnackBar(
-                        content: Text(
-                          "Attention : vous devez choisir un·e propriétaire",
-                        ),
-                        behavior: SnackBarBehavior.floating,
-                      ),
-                    );
-                    return;
-                  }
-
-                  void setPrice(num newPrice) async {
-                    setState(() {
-                      price = newPrice;
-                    });
-                  }
-
-                  Result<Book> result = await widget.viewModel.scanBook(
-                    barcodes,
-                  );
-
-                  switch (result) {
-                    case Ok():
-                      await _confirmationDialogBuilder(
-                        context,
-                        setPrice,
-                        controller,
-                        widget.viewModel,
-                        result.value,
-                      );
-                      break;
-                    case Error():
-                      ScaffoldMessenger.of(context).showSnackBar(
-                        SnackBar(
-                          content: Text("Erreur : ${result.error}"),
-                          behavior: SnackBarBehavior.floating,
-                        ),
-                      );
-                      break;
-                  }
-                },
-              ),
-              SafeArea(
-                child: SingleChildScrollView(
-                  child: Column(
-                    crossAxisAlignment: CrossAxisAlignment.center,
-                    mainAxisSize: MainAxisSize.min,
-                    children: [
-                      SizedBox(height: 5),
-                      Center(
-                        child: Card(
-                          margin: EdgeInsets.symmetric(horizontal: 50),
-                          child: Column(
-                            mainAxisSize: MainAxisSize.min,
-                            children: [
-                              ListTile(
-                                leading: Icon(Icons.person),
-                                title: TextButton(
-                                  child: Text(
-                                    (widget.viewModel.currentOwner == null)
-                                        ? "Aucun"
-                                        : "${widget.viewModel.currentOwner!.firstName} ${widget.viewModel.currentOwner!.lastName}",
-                                  ),
-                                  onPressed: () => _ownerDialogBuilder(
-                                    context,
-                                    controller,
-                                    widget.viewModel,
-                                  ),
-                                ),
-                              ),
-                              ListTile(
-                                leading: Icon(Icons.attach_money),
-                                title: TextButton(
-                                  child: Text(
-                                    (widget.viewModel.askPrice)
-                                        ? "Demander à chaque fois"
-                                        : "Prix libre toujours",
-                                  ),
-                                  onPressed: () {
-                                    setState(() {
-                                      widget.viewModel.askPrice =
-                                          !widget.viewModel.askPrice;
-                                    });
-                                  },
-                                ),
-                              ),
-                            ],
-                          ),
-                        ),
-                      ),
-                    ],
-                  ),
-                ),
-              ),
-              Center(child: SvgPicture.asset('assets/scan-overlay.svg')),
-              SafeArea(
                 child: Column(
-                  mainAxisAlignment: MainAxisAlignment.end,
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  crossAxisAlignment: CrossAxisAlignment.center,
                   children: [
-                    Center(
+                    Text(
-                      child: TextButton(
+                      "Aucune bal n'est active.",
-                        style: ButtonStyle(
+                      style: TextStyle(fontSize: 25),
-                          backgroundColor: WidgetStatePropertyAll(
+                      textAlign: TextAlign.center,
-                            theme.cardColor,
+                    ),
-                          ),
+                    SizedBox(height: 15),
-                        ),
+                    Text(
-                        onPressed: () => _formDialogBuilder(
+                      "Vous devez créer puis activer une BAL pour pouvoir scanner des livres.",
-                          context,
+                      textAlign: TextAlign.center,
-                          controller,
+                    ),
-                          widget.viewModel,
+                    SizedBox(height: 30),
-                        ),
+                    ElevatedButton(
-                        child: Text("Enregistrer manuellement"),
+                      onPressed: () {
-                      ),
+                        context.go(Routes.home);
+                      },
+                      child: Text("Gérer les BALs"),
                     ),
-                    SizedBox(height: 5),
                   ],
                 ),
               ),
-            ],
+            ),
-          ),
+            _ => Stack(
+              children: [
+                ColoredBox(color: Colors.black),
+                MobileScanner(
+                  controller: controller,
+                  onDetect: (barcodes) async {
+                    if (widget.viewModel.currentOwner == null) {
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(
+                          content: Text(
+                            "Attention : vous devez choisir un·e propriétaire",
+                          ),
+                          behavior: SnackBarBehavior.floating,
+                        ),
+                      );
+                      return;
+                    }
+
+                    void setPrice(num newPrice) async {
+                      setState(() {
+                        price = newPrice;
+                      });
+                    }
+
+                    Result<Book> result = await widget.viewModel.scanBook(
+                      barcodes,
+                    );
+
+                    switch (result) {
+                      case Ok():
+                        await _confirmationDialogBuilder(
+                          context,
+                          setPrice,
+                          controller,
+                          widget.viewModel,
+                          result.value,
+                        );
+                        break;
+                      case Error():
+                        ScaffoldMessenger.of(context).showSnackBar(
+                          SnackBar(
+                            content: Text("Erreur : ${result.error}"),
+                            behavior: SnackBarBehavior.floating,
+                          ),
+                        );
+                        break;
+                    }
+                  },
+                ),
+                SafeArea(
+                  child: SingleChildScrollView(
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.center,
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        SizedBox(height: 5),
+                        Center(
+                          child: Card(
+                            margin: EdgeInsets.symmetric(horizontal: 50),
+                            child: Column(
+                              mainAxisSize: MainAxisSize.min,
+                              children: [
+                                ListTile(
+                                  leading: Icon(Icons.person),
+                                  title: TextButton(
+                                    child: Text(
+                                      (widget.viewModel.currentOwner == null)
+                                          ? "Aucun"
+                                          : "${widget.viewModel.currentOwner!.firstName} ${widget.viewModel.currentOwner!.lastName}",
+                                    ),
+                                    onPressed: () => _ownerDialogBuilder(
+                                      context,
+                                      controller,
+                                      widget.viewModel,
+                                    ),
+                                  ),
+                                ),
+                                ListTile(
+                                  leading: Icon(Icons.attach_money),
+                                  title: TextButton(
+                                    child: Text(
+                                      (widget.viewModel.askPrice)
+                                          ? "Demander à chaque fois"
+                                          : "Prix libre toujours",
+                                    ),
+                                    onPressed: () {
+                                      setState(() {
+                                        widget.viewModel.askPrice =
+                                            !widget.viewModel.askPrice;
+                                      });
+                                    },
+                                  ),
+                                ),
+                              ],
+                            ),
+                          ),
+                        ),
+                      ],
+                    ),
+                  ),
+                ),
+                Center(child: SvgPicture.asset('assets/scan-overlay.svg')),
+                SafeArea(
+                  child: Column(
+                    mainAxisAlignment: MainAxisAlignment.end,
+                    children: [
+                      Center(
+                        child: TextButton(
+                          style: ButtonStyle(
+                            backgroundColor: WidgetStatePropertyAll(
+                              theme.cardColor,
+                            ),
+                          ),
+                          onPressed: () => _formDialogBuilder(
+                            context,
+                            controller,
+                            widget.viewModel,
+                          ),
+                          child: Text("Enregistrer manuellement"),
+                        ),
+                      ),
+                      SizedBox(height: 5),
+                    ],
+                  ),
+                ),
+              ],
+            ),
+          },
         },
       ),
     );

lib/ui/add_page/widgets/confirmation_popup.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:seshat/domain/models/bal.dart';
 import 'package:seshat/domain/models/book.dart';
 import 'package:seshat/ui/add_page/view_model/add_view_model.dart';
 import 'package:seshat/utils/result.dart';
@@ -117,7 +116,7 @@ class _ConfirmationPopupState extends State<ConfirmationPopup> {
             var result = await widget.viewModel.sendBook(
               widget.book,
               widget.viewModel.currentOwner!,
-              Bal(id: 1),
+              widget.viewModel.currentBal!,
               price,
             );
             switch (result) {

lib/ui/bal_page/view_model/bal_view_model.dart

@@ -0,0 +1,56 @@
+import 'package:flutter/widgets.dart';
+import 'package:seshat/data/repositories/bal_repository.dart';
+import 'package:seshat/domain/models/bal.dart';
+import 'package:seshat/utils/command.dart';
+import 'package:seshat/utils/result.dart';
+
+class BalViewModel extends ChangeNotifier {
+  BalViewModel({required BalRepository balRepository, required this.id})
+    : _balRepository = balRepository {
+    load = Command0(_load)..execute();
+  }
+
+  final BalRepository _balRepository;
+
+  Bal? _bal;
+  int? id;
+  Bal? get bal => _bal;
+
+  /*
+ * =================================
+ * =====[ COMMAND AND LOADING ]=====
+ * =================================
+*/
+
+  late final Command0 load;
+  bool isLoaded = false;
+
+  Future<Result<void>> _load() async {
+    final result1 = await _loadBal();
+    switch (result1) {
+      case Error():
+        return result1;
+      default:
+        break;
+    }
+    isLoaded = true;
+    notifyListeners();
+    return result1;
+  }
+
+  Future<Result<void>> _loadBal() async {
+    if (id == null) {
+      return Result.error(Exception("No id given"));
+    }
+    final result = await _balRepository.balById(id!);
+    switch (result) {
+      case Ok():
+        _bal = result.value;
+        break;
+      case Error():
+        break;
+    }
+
+    return result;
+  }
+}

lib/ui/bal_page/widget/bal_screen.dart

@@ -0,0 +1,40 @@
+import 'package:flutter/material.dart';
+import 'package:seshat/domain/models/bal.dart';
+import 'package:seshat/ui/bal_page/view_model/bal_view_model.dart';
+import 'package:seshat/ui/core/ui/navigation_bar.dart';
+
+class BalScreen extends StatefulWidget {
+  const BalScreen({super.key, required this.viewModel});
+
+  final BalViewModel viewModel;
+
+  @override
+  State<BalScreen> createState() => _BalScreenState();
+}
+
+class _BalScreenState extends State<BalScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      bottomNavigationBar: AppNavigationBar(startIndex: 0),
+      body: ListenableBuilder(
+        listenable: widget.viewModel,
+        builder: (context, child) {
+          return switch (widget.viewModel.isLoaded) {
+            false => Center(child: CircularProgressIndicator()),
+            true => switch (widget.viewModel.bal == null) {
+              true => Center(
+                child: Text("La BAL référencée n'est pas accessible"),
+              ),
+              false => switch (widget.viewModel.bal!.state) {
+                BalState.pending => Center(child: Text("Pending")),
+                BalState.ongoing => Center(child: Text("Ongoing")),
+                BalState.ended => Center(child: Text("Ending")),
+              },
+            },
+          };
+        },
+      ),
+    );
+  }
+}

lib/ui/home_page/home_page.dart

@@ -1,16 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
-import 'package:seshat/ui/core/ui/navigation_bar.dart';
-
-class HomePage extends StatelessWidget {
-  const HomePage({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      bottomNavigationBar: AppNavigationBar(startIndex: 0),
-      body: Center(child: Text("Home page.")),
-    );
-    // return Center(child: Text("Home page;"));
-  }
-}

lib/ui/home_page/view_model/home_view_model.dart

@@ -0,0 +1,79 @@
+import 'package:flutter/material.dart';
+import 'package:seshat/data/repositories/bal_repository.dart';
+import 'package:seshat/domain/models/bal.dart';
+import 'package:seshat/utils/command.dart';
+import 'package:seshat/utils/result.dart';
+
+class HomeViewModel extends ChangeNotifier {
+  HomeViewModel({required BalRepository balRepository})
+    : _balRepository = balRepository {
+    load = Command0(_load)..execute();
+  }
+
+  final BalRepository _balRepository;
+
+  /*
+ * =================
+ * =====[ BAL ]=====
+ * =================
+*/
+
+  List<Bal> _bals = [];
+  List<Bal> get bals => _bals;
+
+  Bal? _currentBal;
+  Bal? get currentBal => _currentBal;
+
+  Future<Result<void>> createBal(String name) async {
+    final result = await _balRepository.addBal(name);
+    switch (result) {
+      case Ok():
+        final result2 = await _balRepository.getBals();
+        switch (result2) {
+          case Ok():
+            _bals = result2.value..sort((a, b) => a.compareTo(b));
+            break;
+          case Error():
+            debugPrint("\n\n\n\n${result2.error.toString()}\n\n\n\n");
+            return result2;
+        }
+        break;
+      case Error():
+        return result;
+    }
+    notifyListeners();
+    return result;
+  }
+
+  /*
+ * =================================
+ * =====[ COMMAND AND LOADING ]=====
+ * =================================
+*/
+
+  late final Command0 load;
+  bool isLoaded = false;
+
+  Future<Result<void>> _load() async {
+    final result2 = await _loadBal();
+    isLoaded = true;
+    notifyListeners();
+    return result2;
+  }
+
+  Future<Result<void>> _loadBal() async {
+    final result = await _balRepository.getBals();
+    switch (result) {
+      case Ok():
+        _bals = result.value..sort((a, b) => a.compareTo(b));
+        _currentBal = _bals
+            .where((bal) => bal.state == BalState.ongoing)
+            .firstOrNull;
+        break;
+      case Error():
+        return result;
+    }
+
+    return result;
+  }
+}

lib/ui/home_page/widgets/create_confirmation_popup.dart

@@ -0,0 +1,71 @@
+import 'package:flutter/material.dart';
+import 'package:seshat/ui/home_page/view_model/home_view_model.dart';
+
+class CreateConfirmationPopup extends StatefulWidget {
+  const CreateConfirmationPopup({super.key, required this.viewModel});
+
+  final HomeViewModel viewModel;
+
+  @override
+  State<CreateConfirmationPopup> createState() =>
+      _CreateConfirmationPopupState();
+}
+
+class _CreateConfirmationPopupState extends State<CreateConfirmationPopup> {
+  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
+  String? name;
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text("Créer une BAL"),
+      content: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Form(
+            key: _formKey,
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                TextFormField(
+                  decoration: InputDecoration(
+                    labelText: "Nom de la BAL",
+                    border: OutlineInputBorder(),
+                  ),
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return "Veuillez entrer un nom";
+                    }
+                    return null;
+                  },
+                  onSaved: (newValue) {
+                    name = newValue;
+                  },
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+      actions: [
+        TextButton(
+          onPressed: () {
+            Navigator.of(context).pop();
+          },
+          child: Text("Annuler"),
+        ),
+        TextButton(
+          onPressed: () async {
+            if (_formKey.currentState!.validate()) {
+              _formKey.currentState!.save();
+              await widget.viewModel.createBal(name!);
+            }
+            if (context.mounted) {
+              Navigator.of(context).pop();
+            }
+          },
+          child: Text("Valider"),
+        ),
+      ],
+    );
+  }
+}

lib/ui/home_page/widgets/home_page.dart

@@ -0,0 +1,213 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import 'package:seshat/domain/models/bal.dart';
+import 'package:seshat/ui/core/ui/navigation_bar.dart';
+import 'package:seshat/ui/home_page/view_model/home_view_model.dart';
+import 'package:seshat/ui/home_page/widgets/create_confirmation_popup.dart';
+
+class HomePage extends StatefulWidget {
+  const HomePage({super.key, required this.viewModel});
+
+  final HomeViewModel viewModel;
+
+  @override
+  State<HomePage> createState() => _HomePageState();
+}
+
+class _HomePageState extends State<HomePage> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      bottomNavigationBar: AppNavigationBar(startIndex: 0),
+      body: ListenableBuilder(
+        listenable: widget.viewModel,
+        builder: (context, child) {
+          return switch (widget.viewModel.isLoaded) {
+            false => Center(child: CircularProgressIndicator()),
+            true => switch (widget.viewModel.currentBal == null) {
+              true => HomePageOnNoCurrent(widget: widget),
+              false => HomePageOnCurrent(widget: widget),
+            },
+          };
+        },
+      ),
+    );
+    // return Center(child: Text("Home page;"));
+  }
+}
+
+class HomePageOnNoCurrent extends StatelessWidget {
+  const HomePageOnNoCurrent({super.key, required this.widget});
+
+  final HomePage widget;
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        Expanded(
+          child: (widget.viewModel.bals.isEmpty)
+              ? Center(child: Text("Aucune BAL existante"))
+              : ListView(
+                  children: [
+                    for (Bal bal in widget.viewModel.bals.where(
+                      (el) => el.id != widget.viewModel.currentBal?.id,
+                    ))
+                      Padding(
+                        padding: const EdgeInsets.symmetric(horizontal: 10.0),
+                        child: Card(
+                          child: ListTile(
+                            leading: switch (bal.state) {
+                              BalState.pending => Icon(Icons.event),
+                              BalState.ongoing => Icon(Icons.event_available),
+                              BalState.ended => Icon(Icons.lock),
+                            },
+                            title: Text(bal.name),
+                            subtitle: switch (bal.state) {
+                              BalState.pending => Text(
+                                "À venir · Débute le ${bal.startTime.toString()}",
+                              ),
+                              BalState.ongoing => Text("En cours"),
+                              BalState.ended => Text("Terminée"),
+                            },
+                            trailing: switch (bal.state) {
+                              BalState.pending => IconButton(
+                                onPressed: () {
+                                  _moveToBal(context, bal.id);
+                                },
+                                icon: Icon(Icons.edit),
+                              ),
+                              BalState.ongoing => IconButton(
+                                onPressed: () {
+                                  _moveToBal(context, bal.id);
+                                },
+                                icon: Icon(Icons.arrow_forward),
+                              ),
+                              BalState.ended => IconButton(
+                                onPressed: () {
+                                  _moveToBal(context, bal.id);
+                                },
+                                icon: Icon(Icons.analytics),
+                              ),
+                            },
+                          ),
+                        ),
+                      ),
+                  ],
+                ),
+        ),
+        SizedBox(height: 10),
+        ElevatedButton(
+          onPressed: () {
+            showDialog(
+              context: context,
+              builder: (context) {
+                return CreateConfirmationPopup(viewModel: widget.viewModel);
+              },
+            );
+          },
+          child: Text("Débuter une BAL"),
+        ),
+        SizedBox(height: 5),
+      ],
+    );
+  }
+}
+
+class HomePageOnCurrent extends StatelessWidget {
+  const HomePageOnCurrent({super.key, required this.widget});
+
+  final HomePage widget;
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        Expanded(
+          child: (widget.viewModel.bals.isEmpty)
+              ? Center(child: Text("Aucune BAL existante"))
+              : ListView(
+                  children: [
+                    for (Bal bal in widget.viewModel.bals.where(
+                      (el) => el.id != widget.viewModel.currentBal?.id,
+                    ))
+                      Padding(
+                        padding: const EdgeInsets.symmetric(horizontal: 10.0),
+                        child: Card(
+                          child: ListTile(
+                            leading: switch (bal.state) {
+                              BalState.pending => Icon(Icons.event),
+                              BalState.ongoing => Icon(Icons.event_available),
+                              BalState.ended => Icon(Icons.lock),
+                            },
+                            title: Text(bal.name),
+                            subtitle: switch (bal.state) {
+                              BalState.pending => Text(
+                                "À venir · Débute le ${bal.startTime.toString()}",
+                              ),
+                              BalState.ongoing => Text("En cours"),
+                              BalState.ended => Text("Terminée"),
+                            },
+                            trailing: switch (bal.state) {
+                              BalState.pending => IconButton(
+                                onPressed: () {
+                                  _moveToBal(context, bal.id);
+                                },
+                                icon: Icon(Icons.edit),
+                              ),
+                              BalState.ongoing => IconButton(
+                                onPressed: () {
+                                  _moveToBal(context, bal.id);
+                                },
+                                icon: Icon(Icons.arrow_forward),
+                              ),
+                              BalState.ended => IconButton(
+                                onPressed: () {
+                                  _moveToBal(context, bal.id);
+                                },
+                                icon: Icon(Icons.analytics),
+                              ),
+                            },
+                          ),
+                        ),
+                      ),
+                  ],
+                ),
+        ),
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 10.0),
+          child: Card(
+            child: ListTile(
+              leading: Icon(Icons.event_available),
+              title: Text(widget.viewModel.currentBal!.name),
+              subtitle: Text("BAL en cours"),
+              trailing: IconButton(
+                onPressed: () {
+                  _moveToBal(context, widget.viewModel.currentBal!.id);
+                },
+                icon: Icon(Icons.arrow_forward),
+              ),
+            ),
+          ),
+        ),
+        SizedBox(height: 10),
+        ElevatedButton(
+          onPressed: () {
+            showDialog(
+              context: context,
+              builder: (context) {
+                return CreateConfirmationPopup(viewModel: widget.viewModel);
+              },
+            );
+          },
+          child: Text("Créer une BAL"),
+        ),
+        SizedBox(height: 5),
+      ],
+    );
+  }
+}
+
+void _moveToBal(BuildContext context, int id) {
+  context.goNamed("bal", pathParameters: {"id": id.toString()});
+}

lib/ui/sell_page/view_model/sell_view_model.dart

@@ -1,9 +1,18 @@
 import 'package:flutter/widgets.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:seshat/data/repositories/bal_repository.dart';
+import 'package:seshat/domain/models/bal.dart';
 import 'package:seshat/domain/models/book_instance.dart';
+import 'package:seshat/utils/command.dart';
+import 'package:seshat/utils/result.dart';
 
 class SellViewModel extends ChangeNotifier {
-  SellViewModel();
+  SellViewModel({required BalRepository balRepository})
+    : _balRepository = balRepository {
+    load = Command0(_load)..execute();
+  }
+
+  final BalRepository _balRepository;
 
   bool _showScan = false;
   bool get showScan => _showScan;
@@ -12,6 +21,12 @@ class SellViewModel extends ChangeNotifier {
     notifyListeners();
   }
 
+  /*
+ * ===============================
+ * =====[ BOOKS & INSTANCES ]=====
+ * ===============================
+*/
+
   final List<BookInstance> _scannedBooks = [];
   get scannedBooks => _scannedBooks;
   void scanBook(BarcodeCapture barcode) {
@@ -36,4 +51,44 @@ class SellViewModel extends ChangeNotifier {
     _scannedBooks.removeWhere((book) => book.id == id);
     notifyListeners();
   }
+
+  /*
+ * =================
+ * =====[ BAL ]=====
+ * =================
+*/
+
+  Bal? _currentBal;
+  get currentBal => _currentBal;
+
+  /*
+ * =================================
+ * =====[ COMMAND AND LOADING ]=====
+ * =================================
+*/
+
+  late final Command0 load;
+  bool isLoaded = false;
+
+  Future<Result<void>> _load() async {
+    final result2 = await _loadBal();
+    isLoaded = true;
+    notifyListeners();
+    return result2;
+  }
+
+  Future<Result<void>> _loadBal() async {
+    final result = await _balRepository.getBals();
+    switch (result) {
+      case Ok():
+        _currentBal = result.value
+            .where((bal) => bal.state == BalState.ongoing)
+            .firstOrNull;
+        break;
+      case Error():
+        break;
+    }
+
+    return result;
+  }
 }

lib/ui/sell_page/widgets/scan_screen.dart

@@ -5,9 +5,9 @@ import 'package:seshat/ui/sell_page/view_model/sell_view_model.dart';
 import 'package:seshat/ui/sell_page/widgets/manual_scan_popup.dart';
 
 class ScanScreen extends StatefulWidget {
-  ScanScreen({super.key, required this.viewModel});
+  const ScanScreen({super.key, required this.viewModel});
 
-  SellViewModel viewModel;
+  final SellViewModel viewModel;
 
   @override
   State<ScanScreen> createState() => _ScanScreenState();

lib/ui/sell_page/widgets/sell_page.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
 import 'package:seshat/domain/models/book_instance.dart';
+import 'package:seshat/routing/routes.dart';
 import 'package:seshat/ui/core/ui/navigation_bar.dart';
 import 'package:seshat/ui/sell_page/view_model/sell_view_model.dart';
 import 'package:seshat/ui/sell_page/widgets/scan_screen.dart';
@@ -21,93 +23,133 @@ class _SellPageState extends State<SellPage> {
       body: ListenableBuilder(
         listenable: widget.viewModel,
         builder: (context, child) {
-          return Stack(
+          return switch (widget.viewModel.isLoaded) {
-            children: [
+            false => Center(child: CircularProgressIndicator()),
-              SafeArea(
+            true => switch (widget.viewModel.currentBal) {
-                child: Column(
+              null => Center(
-                  mainAxisSize: MainAxisSize.min,
+                child: SizedBox(
-                  crossAxisAlignment: CrossAxisAlignment.center,
+                  width: 300,
-                  children: [
+                  child: Column(
-                    SizedBox(height: 6),
+                    mainAxisAlignment: MainAxisAlignment.center,
-                    Expanded(
+                    crossAxisAlignment: CrossAxisAlignment.center,
-                      child: ListView(
+                    children: [
-                        children: [
+                      Text(
-                          for (BookInstance bookInstance
+                        "Aucune bal n'est active.",
-                              in widget.viewModel.scannedBooks)
+                        style: TextStyle(fontSize: 25),
-                            Card(
+                        textAlign: TextAlign.center,
-                              child: ListTile(
-                                leading: Text(
-                                  "${bookInstance.price.toString()}€",
-                                  style: TextStyle(fontSize: 30),
-                                ),
-                                title: Text(
-                                  "Les chiens et la charrue · Patrick K. Dewdney ${bookInstance.id}",
-                                ),
-                                subtitle: Text("Union Étudiante Auvergne"),
-                                trailing: IconButton(
-                                  onPressed: () {
-                                    widget.viewModel.deleteBook(
-                                      bookInstance.id,
-                                    );
-                                  },
-                                  icon: Icon(Icons.delete),
-                                ),
-                              ),
-                            ),
-                        ],
                       ),
-                    ),
+                      SizedBox(height: 15),
-                    SizedBox(height: 40),
+                      Text(
-                    Text("Somme minimum requise : 20€"),
+                        "Vous devez créer puis activer une BAL pour pouvoir scanner des livres.",
-                    SizedBox(
+                        textAlign: TextAlign.center,
-                      width: 400,
-                      child: TextField(
-                        decoration: InputDecoration(
-                          labelText: "Argent reçu",
-                          helperText:
-                              "L'argent reçu sera réparti automatiquement",
-                          suffixText: "€",
-                          border: OutlineInputBorder(),
-                        ),
-                        keyboardType: TextInputType.number,
                       ),
-                    ),
+                      SizedBox(height: 30),
-                    SizedBox(height: 10),
+                      ElevatedButton(
-                    Row(
+                        onPressed: () {
-                      mainAxisAlignment: MainAxisAlignment.center,
+                          context.go(Routes.home);
-                      children: [
+                        },
-                        IconButton(
+                        child: Text("Gérer les BALs"),
-                          onPressed: () {
+                      ),
-                            widget.viewModel.sendSell();
+                    ],
-                          },
+                  ),
-                          icon: Icon(Icons.check),
-                          style: ButtonStyle(
-                            iconSize: WidgetStatePropertyAll(70),
-                          ),
-                        ),
-                        SizedBox(width: 70),
-                        IconButton(
-                          onPressed: () {
-                            widget.viewModel.showScan = true;
-                          },
-                          icon: Icon(Icons.add),
-                          style: ButtonStyle(
-                            iconSize: WidgetStatePropertyAll(70),
-                            elevation: WidgetStatePropertyAll(50),
-                          ),
-                        ),
-                      ],
-                    ),
-                    SizedBox(height: 5),
-                  ],
                 ),
               ),
+              _ => Stack(
+                children: [
+                  SafeArea(
+                    child: Column(
+                      mainAxisSize: MainAxisSize.min,
+                      crossAxisAlignment: CrossAxisAlignment.center,
+                      children: [
+                        SizedBox(height: 6),
+                        Expanded(
+                          child: ListView(
+                            children: [
+                              for (BookInstance bookInstance
+                                  in widget.viewModel.scannedBooks)
+                                Padding(
+                                  padding: const EdgeInsets.symmetric(
+                                    horizontal: 15,
+                                  ),
+                                  child: Card(
+                                    child: ListTile(
+                                      leading: Text(
+                                        "${bookInstance.price.toString()}€",
+                                        style: TextStyle(fontSize: 30),
+                                      ),
+                                      title: Text(
+                                        "Les chiens et la charrue · Patrick K. Dewdney ${bookInstance.id}",
+                                      ),
+                                      subtitle: Text(
+                                        "Union Étudiante Auvergne",
+                                      ),
+                                      trailing: IconButton(
+                                        onPressed: () {
+                                          widget.viewModel.deleteBook(
+                                            bookInstance.id,
+                                          );
+                                        },
+                                        icon: Icon(Icons.delete),
+                                      ),
+                                    ),
+                                  ),
+                                ),
+                            ],
+                          ),
+                        ),
+                        SizedBox(height: 40),
+                        Text("Somme minimum requise : 20€"),
+                        SizedBox(
+                          width: 400,
+                          child: TextField(
+                            decoration: InputDecoration(
+                              labelText: "Argent reçu",
+                              helperText:
+                                  "L'argent reçu sera réparti automatiquement",
+                              suffixText: "€",
+                              border: OutlineInputBorder(),
+                            ),
+                            keyboardType: TextInputType.number,
+                          ),
+                        ),
+                        SizedBox(height: 10),
+                        Row(
+                          mainAxisAlignment: MainAxisAlignment.center,
+                          children: [
+                            IconButton(
+                              onPressed: () {
+                                widget.viewModel.sendSell();
+                              },
+                              icon: Icon(Icons.check),
+                              style: ButtonStyle(
+                                iconSize: WidgetStatePropertyAll(70),
+                              ),
+                            ),
+                            SizedBox(width: 70),
+                            IconButton(
+                              onPressed: () {
+                                widget.viewModel.showScan = true;
+                              },
+                              icon: Icon(Icons.add),
+                              style: ButtonStyle(
+                                iconSize: WidgetStatePropertyAll(70),
+                                elevation: WidgetStatePropertyAll(50),
+                              ),
+                            ),
+                          ],
+                        ),
+                        SizedBox(height: 5),
+                      ],
+                    ),
+                  ),
 
-              (widget.viewModel.showScan)
+                  (widget.viewModel.showScan)
-                  ? ScanScreen(viewModel: widget.viewModel)
+                      ? ScanScreen(viewModel: widget.viewModel)
-                  : SizedBox(),
+                      : SizedBox(),
-            ],
+                ],
-          );
+              ),
+            },
+          };
         },
       ),
     );