fix: set default values through json key

lib/api/category.dart

@@ -18,25 +18,43 @@ class WalletCategory {
     required this.color,
   });
 
-  /// Connects the generated fromJson method
+  /// Generates a class instance from a Map
   factory WalletCategory.fromJson(Map<String, dynamic> json) =>
       _$WalletCategoryFromJson(json);
 
+  /// Default [WalletCategory] instance for json_serializable
+  factory WalletCategory.unknown() => WalletCategory(
+        name: "Unknown",
+        id: -1,
+        icon: Icons.question_mark,
+        color: Colors.green,
+      );
+
   /// User-defined name
+  @JsonKey(defaultValue: "Unknown")
   String name;
 
   /// Unique identificator of the category
+  @JsonKey(required: true, disallowNullValue: true)
   final int id;
 
   /// Selected Icon for the category
-  @JsonKey(fromJson: _iconDataFromJson, toJson: _iconDataToJson)
+  @JsonKey(
+    fromJson: _iconDataFromJson,
+    toJson: _iconDataToJson,
+    defaultValue: _defaultIcon,
+  )
   IconData icon;
 
   /// The color that will be displayed with entry
-  @JsonKey(fromJson: _colorFromJson, toJson: _colorToJson)
+  @JsonKey(
+    fromJson: _colorFromJson,
+    toJson: _colorToJson,
+    defaultValue: _defaultColor,
+  )
   Color color;
 
-  /// Connects the generated toJson method
+  /// Converts the data in this instance into a Map
   Map<String, dynamic> toJson() => _$WalletCategoryToJson(this);
 
   @override
@@ -62,3 +80,6 @@ enum EntryType {
   /// Income
   income
 }
+
+IconData _defaultIcon() => Icons.question_mark;
+Color _defaultColor() => Colors.green;

lib/api/category.g.dart

@@ -1,7 +1,3 @@
-// SPDX-FileCopyrightText: (C) 2024 Matyáš Caras
-//
-// SPDX-License-Identifier: AGPL-3.0-only
-
 // GENERATED CODE - DO NOT MODIFY BY HAND
 
 part of 'category.dart';
@@ -10,13 +6,23 @@ part of 'category.dart';
 // JsonSerializableGenerator
 // **************************************************************************
 
-WalletCategory _$WalletCategoryFromJson(Map<String, dynamic> json) =>
-    WalletCategory(
-      name: json['name'] as String,
-      id: json['id'] as int,
-      icon: _iconDataFromJson(json['icon'] as Map<String, dynamic>),
-      color: _colorFromJson(json['color'] as int),
-    );
+WalletCategory _$WalletCategoryFromJson(Map<String, dynamic> json) {
+  $checkKeys(
+    json,
+    requiredKeys: const ['id'],
+    disallowNullValues: const ['id'],
+  );
+  return WalletCategory(
+    name: json['name'] as String? ?? 'Unknown',
+    id: (json['id'] as num).toInt(),
+    icon: json['icon'] == null
+        ? _defaultIcon()
+        : _iconDataFromJson(json['icon'] as Map<String, dynamic>),
+    color: json['color'] == null
+        ? _defaultColor()
+        : _colorFromJson((json['color'] as num).toInt()),
+  );
+}
 
 Map<String, dynamic> _$WalletCategoryToJson(WalletCategory instance) =>
     <String, dynamic>{

lib/api/debt_entry.dart

@@ -0,0 +1,42 @@
+import 'package:json_annotation/json_annotation.dart';
+import 'package:prasule/api/debt_person.dart';
+part 'debt_entry.g.dart';
+
+/// Single transaction
+///
+/// The debt will be split between people who are not in [whoPayed]
+@JsonSerializable()
+class DebtEntry {
+  /// Single transaction
+  ///
+  /// The debt will be split between people who are not in [whoPayed]
+  DebtEntry({
+    required this.id,
+    required this.amount,
+    required this.name,
+    required this.whoPayed,
+  }) : assert(whoPayed.isNotEmpty, "There has to be at least one payer");
+
+  /// Generates a class instance from a Map
+  factory DebtEntry.fromJson(Map<String, dynamic> json) =>
+      _$DebtEntryFromJson(json);
+
+  /// Converts the data in this instance into a Map
+  Map<String, dynamic> toJson() => _$DebtEntryToJson(this);
+
+  /// Unique identifier
+  @JsonKey(required: true, disallowNullValue: true)
+  final int id;
+
+  /// The payed amount
+  @JsonKey(defaultValue: 0)
+  int amount;
+
+  /// User-friendly identifier for the transaction
+  @JsonKey(defaultValue: "Unknown")
+  String name;
+
+  /// List of people who payed
+  @JsonKey(defaultValue: DebtPerson.unknownPerson)
+  List<DebtPerson> whoPayed;
+}

lib/api/debt_entry.g.dart

@@ -0,0 +1,31 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'debt_entry.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+DebtEntry _$DebtEntryFromJson(Map<String, dynamic> json) {
+  $checkKeys(
+    json,
+    requiredKeys: const ['id'],
+    disallowNullValues: const ['id'],
+  );
+  return DebtEntry(
+    id: (json['id'] as num).toInt(),
+    amount: (json['amount'] as num?)?.toInt() ?? 0,
+    name: json['name'] as String? ?? 'Unknown',
+    whoPayed: (json['whoPayed'] as List<dynamic>?)
+            ?.map((e) => DebtPerson.fromJson(e as Map<String, dynamic>))
+            .toList() ??
+        DebtPerson.unknownPerson(),
+  );
+}
+
+Map<String, dynamic> _$DebtEntryToJson(DebtEntry instance) => <String, dynamic>{
+      'id': instance.id,
+      'amount': instance.amount,
+      'name': instance.name,
+      'whoPayed': instance.whoPayed,
+    };

lib/api/debt_person.dart

@@ -0,0 +1,28 @@
+import 'package:json_annotation/json_annotation.dart';
+part 'debt_person.g.dart';
+
+@JsonSerializable()
+
+/// Represents a single person in a debt scenario
+class DebtPerson {
+  /// Represents a single person in a debt scenario
+  DebtPerson({required this.id, required this.name});
+
+  /// Default [DebtPerson] instance for json_serializable
+  factory DebtPerson.unknownPerson() => DebtPerson(id: -1, name: "Unknown");
+
+  /// Generates a class instance from a Map
+  factory DebtPerson.fromJson(Map<String, dynamic> json) =>
+      _$DebtPersonFromJson(json);
+
+  /// Converts the data in this instance into a Map
+  Map<String, dynamic> toJson() => _$DebtPersonToJson(this);
+
+  /// Unique identifier
+  @JsonKey(required: true, disallowNullValue: true)
+  final int id;
+
+  /// Identifier that the user will see
+  @JsonKey(defaultValue: "Unknown")
+  String name;
+}

lib/api/debt_person.g.dart

@@ -0,0 +1,25 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'debt_person.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+DebtPerson _$DebtPersonFromJson(Map<String, dynamic> json) {
+  $checkKeys(
+    json,
+    requiredKeys: const ['id'],
+    disallowNullValues: const ['id'],
+  );
+  return DebtPerson(
+    id: (json['id'] as num).toInt(),
+    name: json['name'] as String? ?? 'Unknown',
+  );
+}
+
+Map<String, dynamic> _$DebtPersonToJson(DebtPerson instance) =>
+    <String, dynamic>{
+      'id': instance.id,
+      'name': instance.name,
+    };

lib/api/debt_scenario.dart

@@ -0,0 +1,46 @@
+import 'package:json_annotation/json_annotation.dart';
+import 'package:prasule/api/debt_entry.dart';
+import 'package:prasule/api/debt_person.dart';
+part 'debt_scenario.g.dart';
+
+/// A folder for different entries and people
+@JsonSerializable()
+class DebtScenario {
+  /// A folder for different entries and people
+  DebtScenario({
+    required this.id,
+    required this.name,
+    required this.isArchived,
+    this.entries = const [],
+    this.people = const [],
+  });
+
+  /// Generates a class instance from a Map
+  factory DebtScenario.fromJson(Map<String, dynamic> json) =>
+      _$DebtScenarioFromJson(json);
+
+  /// Converts the data in this instance into a Map
+  Map<String, dynamic> toJson() => _$DebtScenarioToJson(this);
+
+  /// Unique identified
+  @JsonKey(disallowNullValue: true)
+  final int id;
+
+  /// User-friendly identifier
+  @JsonKey(defaultValue: "Unknown")
+  String name;
+
+  /// Whether this scenario should be shown under archived ones
+  @JsonKey(defaultValue: false)
+  bool isArchived;
+
+  /// All entries
+  @JsonKey(defaultValue: [])
+  List<DebtEntry> entries;
+
+  /// All people
+  @JsonKey(defaultValue: _defaultPeopleList)
+  List<DebtPerson> people;
+}
+
+List<DebtPerson> _defaultPeopleList() => [DebtPerson.unknownPerson()];

lib/api/debt_scenario.g.dart

@@ -0,0 +1,36 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'debt_scenario.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+DebtScenario _$DebtScenarioFromJson(Map<String, dynamic> json) {
+  $checkKeys(
+    json,
+    disallowNullValues: const ['id'],
+  );
+  return DebtScenario(
+    id: (json['id'] as num).toInt(),
+    name: json['name'] as String? ?? 'Unknown',
+    isArchived: json['isArchived'] as bool? ?? false,
+    entries: (json['entries'] as List<dynamic>?)
+            ?.map((e) => DebtEntry.fromJson(e as Map<String, dynamic>))
+            .toList() ??
+        [],
+    people: (json['people'] as List<dynamic>?)
+            ?.map((e) => DebtPerson.fromJson(e as Map<String, dynamic>))
+            .toList() ??
+        _defaultPeopleList(),
+  );
+}
+
+Map<String, dynamic> _$DebtScenarioToJson(DebtScenario instance) =>
+    <String, dynamic>{
+      'id': instance.id,
+      'name': instance.name,
+      'isArchived': instance.isArchived,
+      'entries': instance.entries,
+      'people': instance.people,
+    };

lib/api/entry_data.dart

@@ -11,19 +11,25 @@ class EntryData {
   /// Contains raw data
   EntryData({required this.name, required this.amount, this.description = ""});
 
-  /// Connects the generated fromJson method
+  /// Generates a class instance from a Map
   factory EntryData.fromJson(Map<String, dynamic> json) =>
       _$EntryDataFromJson(json);
 
+  /// [EntryData] instance used as a default value for json_serializable
+  factory EntryData.unknown() => EntryData(name: "Unknown", amount: 0);
+
   /// Name of entry
+  @JsonKey(defaultValue: "Unknown")
   String name;
 
   /// Optional description, default is empty
+  @JsonKey(defaultValue: "")
   String description;
 
   /// Amount for entry
+  @JsonKey(defaultValue: 0)
   double amount;
 
-  /// Connects the generated toJson method
+  /// Converts the data in this instance into a Map
   Map<String, dynamic> toJson() => _$EntryDataToJson(this);
 }

lib/api/entry_data.g.dart

@@ -1,7 +1,3 @@
-// SPDX-FileCopyrightText: (C) 2024 Matyáš Caras
-//
-// SPDX-License-Identifier: AGPL-3.0-only
-
 // GENERATED CODE - DO NOT MODIFY BY HAND
 
 part of 'entry_data.dart';
@@ -11,9 +7,9 @@ part of 'entry_data.dart';
 // **************************************************************************
 
 EntryData _$EntryDataFromJson(Map<String, dynamic> json) => EntryData(
-      name: json['name'] as String,
-      amount: (json['amount'] as num).toDouble(),
-      description: json['description'] as String? ?? "",
+      name: json['name'] as String? ?? 'Unknown',
+      amount: (json['amount'] as num?)?.toDouble() ?? 0,
+      description: json['description'] as String? ?? '',
     );
 
 Map<String, dynamic> _$EntryDataToJson(EntryData instance) => <String, dynamic>{

lib/api/recurring_entry.dart

@@ -24,21 +24,24 @@ class RecurringWalletEntry extends WalletSingleEntry {
     this.repeatAfter = 1,
   });
 
-  /// Connects the generated fromJson method
+  /// Generates a class instance from a Map
   factory RecurringWalletEntry.fromJson(Map<String, dynamic> json) =>
       _$RecurringWalletEntryFromJson(json);
 
-  /// Connects the generated toJson method
+  /// Converts the data in this instance into a Map
   @override
   Map<String, dynamic> toJson() => _$RecurringWalletEntryToJson(this);
 
   /// Last date the recurring entry was added into the single entry list
+  @JsonKey(defaultValue: DateTime.now)
   DateTime lastRunDate;
 
   /// After how many {recurType} should the entry recur
+  @JsonKey(defaultValue: 1)
   int repeatAfter;
 
   /// What type of recurrence should happen
+  @JsonKey(defaultValue: RecurType.month)
   RecurType recurType;
 }
 

lib/api/recurring_entry.g.dart

@@ -1,7 +1,3 @@
-// SPDX-FileCopyrightText: (C) 2024 Matyáš Caras
-//
-// SPDX-License-Identifier: AGPL-3.0-only
-
 // GENERATED CODE - DO NOT MODIFY BY HAND
 
 part of 'recurring_entry.dart';
@@ -10,19 +6,33 @@ part of 'recurring_entry.dart';
 // JsonSerializableGenerator
 // **************************************************************************
 
-RecurringWalletEntry _$RecurringWalletEntryFromJson(
-        Map<String, dynamic> json) =>
-    RecurringWalletEntry(
-      data: EntryData.fromJson(json['data'] as Map<String, dynamic>),
-      type: $enumDecode(_$EntryTypeEnumMap, json['type']),
-      date: DateTime.parse(json['date'] as String),
-      category:
-          WalletCategory.fromJson(json['category'] as Map<String, dynamic>),
-      id: json['id'] as int,
-      lastRunDate: DateTime.parse(json['lastRunDate'] as String),
-      repeatAfter: json['repeatAfter'] as int,
-      recurType: $enumDecode(_$RecurTypeEnumMap, json['recurType']),
-    );
+RecurringWalletEntry _$RecurringWalletEntryFromJson(Map<String, dynamic> json) {
+  $checkKeys(
+    json,
+    requiredKeys: const ['id'],
+    disallowNullValues: const ['id'],
+  );
+  return RecurringWalletEntry(
+    data: json['data'] == null
+        ? EntryData.unknown()
+        : EntryData.fromJson(json['data'] as Map<String, dynamic>),
+    type: $enumDecodeNullable(_$EntryTypeEnumMap, json['type']) ??
+        EntryType.expense,
+    date: json['date'] == null
+        ? DateTime.now()
+        : DateTime.parse(json['date'] as String),
+    category: json['category'] == null
+        ? WalletCategory.unknown()
+        : WalletCategory.fromJson(json['category'] as Map<String, dynamic>),
+    id: (json['id'] as num).toInt(),
+    lastRunDate: json['lastRunDate'] == null
+        ? DateTime.now()
+        : DateTime.parse(json['lastRunDate'] as String),
+    recurType: $enumDecodeNullable(_$RecurTypeEnumMap, json['recurType']) ??
+        RecurType.month,
+    repeatAfter: (json['repeatAfter'] as num?)?.toInt() ?? 1,
+  );
+}
 
 Map<String, dynamic> _$RecurringWalletEntryToJson(
         RecurringWalletEntry instance) =>

lib/api/wallet.dart

@@ -34,31 +34,39 @@ class Wallet {
     this.starterBalance = 0,
   });
 
-  /// Connects the generated fromJson method
+  /// Generates a class instance from a Map
   factory Wallet.fromJson(Map<String, dynamic> json) => _$WalletFromJson(json);
 
   /// A list of all [RecurringWalletEntry]s
+  @JsonKey(defaultValue: [])
   final List<RecurringWalletEntry> recurringEntries;
 
   /// Name of the wallet
+  @JsonKey(defaultValue: "Unknown")
   final String name;
 
   /// A list of available categories
+  @JsonKey(defaultValue: _defaultWalletCategory)
   final List<WalletCategory> categories;
 
   /// List of saved entries
+  @JsonKey(defaultValue: [])
   final List<WalletSingleEntry> entries;
 
   /// The starting balance of the wallet
   ///
   /// Used to calculate current balance
+  @JsonKey(defaultValue: 0)
   double starterBalance;
 
   /// Selected currency
-  @JsonKey(fromJson: _currencyFromJson)
+  @JsonKey(
+    fromJson: _currencyFromJson,
+    defaultValue: _defaultCurrency,
+  )
   final Currency currency;
 
-  /// Connects the generated toJson method
+  /// Converts the data in this instance into a Map
   Map<String, dynamic> toJson() => _$WalletToJson(this);
 
   /// Getter for the next unused unique number ID in the wallet's **entry** list
@@ -281,3 +289,20 @@ class Wallet {
     WalletManager.saveWallet(this);
   }
 }
+
+List<WalletCategory> _defaultWalletCategory() => [WalletCategory.unknown()];
+Currency _defaultCurrency() => Currency.from(
+      json: {
+        "code": "USD",
+        "name": "United States Dollar",
+        "symbol": r"$",
+        "flag": "USD",
+        "decimal_digits": 2,
+        "number": 840,
+        "name_plural": "US dollars",
+        "thousands_separator": ",",
+        "decimal_separator": ".",
+        "space_between_amount_and_symbol": false,
+        "symbol_on_left": true,
+      },
+    );

lib/api/wallet.g.dart

@@ -1,7 +1,3 @@
-// SPDX-FileCopyrightText: (C) 2024 Matyáš Caras
-//
-// SPDX-License-Identifier: AGPL-3.0-only
-
 // GENERATED CODE - DO NOT MODIFY BY HAND
 
 part of 'wallet.dart';
@@ -11,22 +7,24 @@ part of 'wallet.dart';
 // **************************************************************************
 
 Wallet _$WalletFromJson(Map<String, dynamic> json) => Wallet(
-      name: json['name'] as String,
-      currency: _currencyFromJson(json['currency'] as Map<String, dynamic>),
+      name: json['name'] as String? ?? 'Unknown',
+      currency: json['currency'] == null
+          ? _defaultCurrency()
+          : _currencyFromJson(json['currency'] as Map<String, dynamic>),
       categories: (json['categories'] as List<dynamic>?)
               ?.map((e) => WalletCategory.fromJson(e as Map<String, dynamic>))
               .toList() ??
-          const [],
+          _defaultWalletCategory(),
       entries: (json['entries'] as List<dynamic>?)
               ?.map(
                   (e) => WalletSingleEntry.fromJson(e as Map<String, dynamic>))
               .toList() ??
-          const [],
+          [],
       recurringEntries: (json['recurringEntries'] as List<dynamic>?)
               ?.map((e) =>
                   RecurringWalletEntry.fromJson(e as Map<String, dynamic>))
               .toList() ??
-          const [],
+          [],
       starterBalance: (json['starterBalance'] as num?)?.toDouble() ?? 0,
     );
 

lib/api/wallet_entry.dart

@@ -21,25 +21,30 @@ class WalletSingleEntry {
     required this.id,
   });
 
-  /// Connects the generated fromJson method
+  /// Generates a class instance from a Map
   factory WalletSingleEntry.fromJson(Map<String, dynamic> json) =>
       _$WalletSingleEntryFromJson(json);
 
   /// Expense or income
+  @JsonKey(defaultValue: EntryType.expense)
   EntryType type;
 
   /// Actual entry data
+  @JsonKey(defaultValue: EntryData.unknown)
   EntryData data;
 
   /// Date of entry creation
+  @JsonKey(defaultValue: DateTime.now)
   DateTime date;
 
   /// Selected category
+  @JsonKey(defaultValue: WalletCategory.unknown)
   WalletCategory category;
 
   /// Unique entry ID
-  int id;
+  @JsonKey(required: true, disallowNullValue: true)
+  final int id;
 
-  /// Connects the generated toJson method
+  /// Converts the data in this instance into a Map
   Map<String, dynamic> toJson() => _$WalletSingleEntryToJson(this);
 }

lib/api/wallet_entry.g.dart

@@ -1,7 +1,3 @@
-// SPDX-FileCopyrightText: (C) 2024 Matyáš Caras
-//
-// SPDX-License-Identifier: AGPL-3.0-only
-
 // GENERATED CODE - DO NOT MODIFY BY HAND
 
 part of 'wallet_entry.dart';
@@ -10,15 +6,27 @@ part of 'wallet_entry.dart';
 // JsonSerializableGenerator
 // **************************************************************************
 
-WalletSingleEntry _$WalletSingleEntryFromJson(Map<String, dynamic> json) =>
-    WalletSingleEntry(
-      data: EntryData.fromJson(json['data'] as Map<String, dynamic>),
-      type: $enumDecode(_$EntryTypeEnumMap, json['type']),
-      date: DateTime.parse(json['date'] as String),
-      category:
-          WalletCategory.fromJson(json['category'] as Map<String, dynamic>),
-      id: json['id'] as int,
-    );
+WalletSingleEntry _$WalletSingleEntryFromJson(Map<String, dynamic> json) {
+  $checkKeys(
+    json,
+    requiredKeys: const ['id'],
+    disallowNullValues: const ['id'],
+  );
+  return WalletSingleEntry(
+    data: json['data'] == null
+        ? EntryData.unknown()
+        : EntryData.fromJson(json['data'] as Map<String, dynamic>),
+    type: $enumDecodeNullable(_$EntryTypeEnumMap, json['type']) ??
+        EntryType.expense,
+    date: json['date'] == null
+        ? DateTime.now()
+        : DateTime.parse(json['date'] as String),
+    category: json['category'] == null
+        ? WalletCategory.unknown()
+        : WalletCategory.fromJson(json['category'] as Map<String, dynamic>),
+    id: (json['id'] as num).toInt(),
+  );
+}
 
 Map<String, dynamic> _$WalletSingleEntryToJson(WalletSingleEntry instance) =>
     <String, dynamic>{