feat: Invoiceアプリの基本機能を追加

Co-authored-by: aider (ollama_chat/7b) <aider@aider.chat>

.github/workflows/flutter.yml

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+name: Flutter CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Flutter
+      uses: subosito/flutter-action@v1
+      with:
+        flutter-version: '3.x'
+    - name: Install dependencies
+      run: flutter pub get
+    - name: Run tests
+      run: flutter test
+    - name: Build the app for release
+      run: flutter build apk --release

create_invoice_screen.dart

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+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'customer_provider.dart';
+import 'product_provider.dart';
+import 'invoice_provider.dart';
+
+class CreateInvoiceScreen extends StatefulWidget {
+  @override
+  _CreateInvoiceScreenState createState() => _CreateInvoiceScreenState();
+}
+
+class _CreateInvoiceScreenState extends State<CreateInvoiceScreen> {
+  final TextEditingController _quantityController = TextEditingController();
+
+  int? _selectedCustomerId;
+  int? _selectedProductId;
+
+  @override
+  Widget build(BuildContext context) {
+    final customerProvider = Provider.of<CustomerProvider>(context);
+    final productProvider = Provider.of<ProductProvider>(context);
+    final invoiceProvider = Provider.of<InvoiceProvider>(context);
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('請求書作成'),
+      ),
+      body: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Column(
+          children: [
+            DropdownButtonFormField<int>(
+              value: _selectedCustomerId,
+              items: customerProvider.customers.map((customer) {
+                return DropdownMenuItem<int>(
+                  value: customer.id,
+                  child: Text(customer.name),
+                );
+              }).toList(),
+              onChanged: (value) {
+                setState(() {
+                  _selectedCustomerId = value;
+                });
+              },
+              decoration: InputDecoration(labelText: '顧客選択'),
+            ),
+            SizedBox(height: 20),
+            DropdownButtonFormField<int>(
+              value: _selectedProductId,
+              items: productProvider.products.map((product) {
+                return DropdownMenuItem<int>(
+                  value: product.id,
+                  child: Text(product.name),
+                );
+              }).toList(),
+              onChanged: (value) {
+                setState(() {
+                  _selectedProductId = value;
+                });
+              },
+              decoration: InputDecoration(labelText: '商品選択'),
+            ),
+            SizedBox(height: 20),
+            TextField(
+              controller: _quantityController,
+              keyboardType: TextInputType.number,
+              decoration: InputDecoration(labelText: '数量'),
+            ),
+            SizedBox(height: 20),
+            ElevatedButton(
+              onPressed: () async {
+                if (_selectedCustomerId != null &&
+                    _selectedProductId != null &&
+                    _quantityController.text.isNotEmpty) {
+                  final quantity = int.parse(_quantityController.text);
+                  final product = productProvider.products.firstWhere((p) => p.id == _selectedProductId);
+
+                  final invoiceItem = InvoiceItem(
+                    invoiceId: 0, // 後で生成される ID
+                    productId: _selectedProductId!,
+                    quantity: quantity,
+                    unitPrice: product.unitPrice,
+                    discount: product.discount,
+                  );
+
+                  final total = (product.unitPrice * quantity) - (product.unitPrice * quantity * product.discount);
+                  final tax = total * 0.1; // 簡易的な税率
+                  final discountTotal = product.unitPrice * quantity * product.discount;
+
+                  final invoice = Invoice(
+                    customerId: _selectedCustomerId!,
+                    date: DateTime.now().toIso8601String(),
+                    total: total,
+                    tax: tax,
+                    discountTotal: discountTotal,
+                  );
+
+                  await invoiceProvider.addInvoice(invoice);
+                  // 追加の処理（PDF生成など）
+
+                  Navigator.pop(context);
+                }
+              },
+              child: Text('PDF生成'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

customer.dart

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+class Customer {
+  final int? id;
+  final String name;
+  final String phone;
+  final String address;
+  final String email;
+
+  Customer({
+    this.id,
+    required this.name,
+    required this.phone,
+    required this.address,
+    required this.email,
+  });
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'name': name,
+      'phone': phone,
+      'address': address,
+      'email': email,
+    };
+  }
+
+  factory Customer.fromMap(Map<String, dynamic> map) {
+    return Customer(
+      id: map['id'] as int?,
+      name: map['name'] as String,
+      phone: map['phone'] as String,
+      address: map['address'] as String,
+      email: map['email'] as String,
+    );
+  }
+}

customer_list_screen.dart

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+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'customer_provider.dart';
+
+class CustomerListScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final customerProvider = Provider.of<CustomerProvider>(context);
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('顧客一覧'),
+      ),
+      body: FutureBuilder<void>(
+        future: customerProvider.fetchCustomers(),
+        builder: (context, snapshot) {
+          if (snapshot.connectionState == ConnectionState.waiting) {
+            return Center(child: CircularProgressIndicator());
+          } else {
+            return ListView.builder(
+              itemCount: customerProvider.customers.length,
+              itemBuilder: (context, index) {
+                final customer = customerProvider.customers[index];
+                return ListTile(
+                  title: Text(customer.name),
+                  subtitle: Text(customer.phone),
+                );
+              },
+            );
+          }
+        },
+      ),
+    );
+  }
+}

customer_provider.dart

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+import 'package:flutter/material.dart';
+import 'package:sqflite/sqflite.dart';
+import 'db_helper.dart';
+import 'customer.dart';
+
+class CustomerProvider with ChangeNotifier {
+  List<Customer> _customers = [];
+
+  List<Customer> get customers => _customers;
+
+  Future<void> fetchCustomers() async {
+    final db = await DbHelper().database;
+    final List<Map<String, dynamic>> maps = await db.query('customers');
+    _customers = List.generate(maps.length, (i) {
+      return Customer.fromMap(maps[i]);
+    });
+    notifyListeners();
+  }
+
+  Future<void> addCustomer(Customer customer) async {
+    final db = await DbHelper().database;
+    await db.insert('customers', customer.toMap());
+    fetchCustomers();
+  }
+
+  // 追加の CRUD メソッドを実装
+}

customer_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:path_provider/path_provider.dart';
+import 'db_helper.dart';
+import 'customer.dart';
+
+void main() {
+  group('Customer Tests', () {
+    late Database db;
+
+    setUp(() async {
+      final io.Directory documentsDirectory = await getApplicationDocumentsDirectory();
+      String path = '${documentsDirectory.path}/test.db';
+      db = await openDatabase(path, version: 1, onCreate: DbHelper()._onCreate);
+    });
+
+    tearDown(() async {
+      await db.close();
+      final io.Directory documentsDirectory = await getApplicationDocumentsDirectory();
+      String path = '${documentsDirectory.path}/test.db';
+      await io.File(path).delete();
+    });
+
+    test('Add and fetch customer', () async {
+      final customer = Customer(
+        name: 'Test Customer',
+        phone: '1234567890',
+        address: 'Test Address',
+        email: 'test@example.com',
+      );
+
+      await db.insert('customers', customer.toMap());
+
+      final List<Map<String, dynamic>> maps = await db.query('customers');
+      expect(maps.length, 1);
+
+      final fetchedCustomer = Customer.fromMap(maps.first);
+      expect(fetchedCustomer.name, 'Test Customer');
+    });
+  });
+}

db_helper.dart

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+import 'package:sqflite/sqflite.dart';
+import 'package:path_provider/path_provider.dart';
+import 'dart:io' as io;
+
+class DbHelper {
+  static Database? _database;
+
+  Future<Database> get database async {
+    if (_database != null) return _database!;
+    _database = await initDb();
+    return _database!;
+  }
+
+  initDb() async {
+    io.Directory documentsDirectory = await getApplicationDocumentsDirectory();
+    String path = '${documentsDirectory.path}/invoice.db';
+    var db = await openDatabase(path, version: 1, onCreate: _onCreate);
+    return db;
+  }
+
+  void _onCreate(Database db, int version) async {
+    await db.execute('''
+      CREATE TABLE customers (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        name TEXT,
+        phone TEXT,
+        address TEXT,
+        email TEXT
+      )
+    ''');
+
+    await db.execute('''
+      CREATE TABLE products (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        name TEXT,
+        unit_price REAL,
+        discount REAL
+      )
+    ''');
+
+    await db.execute('''
+      CREATE TABLE invoices (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        customer_id INTEGER,
+        date TEXT,
+        total REAL,
+        tax REAL,
+        discount_total REAL
+      )
+    ''');
+
+    await db.execute('''
+      CREATE TABLE invoice_items (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        invoice_id INTEGER,
+        product_id INTEGER,
+        quantity INTEGER,
+        unit_price REAL,
+        discount REAL
+      )
+    ''');
+  }
+}

invoice.dart

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+class Invoice {
+  final int? id;
+  final int customerId;
+  final String date;
+  final double total;
+  final double tax;
+  final double discountTotal;
+
+  Invoice({
+    this.id,
+    required this.customerId,
+    required this.date,
+    required this.total,
+    required this.tax,
+    required this.discountTotal,
+  });
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'customer_id': customerId,
+      'date': date,
+      'total': total,
+      'tax': tax,
+      'discount_total': discountTotal,
+    };
+  }
+
+  factory Invoice.fromMap(Map<String, dynamic> map) {
+    return Invoice(
+      id: map['id'] as int?,
+      customerId: map['customer_id'] as int,
+      date: map['date'] as String,
+      total: map['total'] as double,
+      tax: map['tax'] as double,
+      discountTotal: map['discount_total'] as double,
+    );
+  }
+}

invoice_item.dart

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+class InvoiceItem {
+  final int? id;
+  final int invoiceId;
+  final int productId;
+  final int quantity;
+  final double unitPrice;
+  final double discount;
+
+  InvoiceItem({
+    this.id,
+    required this.invoiceId,
+    required this.productId,
+    required this.quantity,
+    required this.unitPrice,
+    required this.discount,
+  });
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'invoice_id': invoiceId,
+      'product_id': productId,
+      'quantity': quantity,
+      'unit_price': unitPrice,
+      'discount': discount,
+    };
+  }
+
+  factory InvoiceItem.fromMap(Map<String, dynamic> map) {
+    return InvoiceItem(
+      id: map['id'] as int?,
+      invoiceId: map['invoice_id'] as int,
+      productId: map['product_id'] as int,
+      quantity: map['quantity'] as int,
+      unitPrice: map['unit_price'] as double,
+      discount: map['discount'] as double,
+    );
+  }
+}

invoice_provider.dart

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+import 'package:flutter/material.dart';
+import 'package:sqflite/sqflite.dart';
+import 'db_helper.dart';
+import 'invoice.dart';
+
+class InvoiceProvider with ChangeNotifier {
+  List<Invoice> _invoices = [];
+
+  List<Invoice> get invoices => _invoices;
+
+  Future<void> fetchInvoices() async {
+    final db = await DbHelper().database;
+    final List<Map<String, dynamic>> maps = await db.query('invoices');
+    _invoices = List.generate(maps.length, (i) {
+      return Invoice.fromMap(maps[i]);
+    });
+    notifyListeners();
+  }
+
+  Future<void> addInvoice(Invoice invoice) async {
+    final db = await DbHelper().database;
+    await db.insert('invoices', invoice.toMap());
+    fetchInvoices();
+  }
+
+  // 追加の CRUD メソッドを実装
+}

invoice_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:path_provider/path_provider.dart';
+import 'db_helper.dart';
+import 'invoice.dart';
+
+void main() {
+  group('Invoice Tests', () {
+    late Database db;
+
+    setUp(() async {
+      final io.Directory documentsDirectory = await getApplicationDocumentsDirectory();
+      String path = '${documentsDirectory.path}/test.db';
+      db = await openDatabase(path, version: 1, onCreate: DbHelper()._onCreate);
+    });
+
+    tearDown(() async {
+      await db.close();
+      final io.Directory documentsDirectory = await getApplicationDocumentsDirectory();
+      String path = '${documentsDirectory.path}/test.db';
+      await io.File(path).delete();
+    });
+
+    test('Add and fetch invoice', () async {
+      final invoice = Invoice(
+        customerId: 1,
+        date: DateTime.now().toIso8601String(),
+        total: 90.0,
+        tax: 9.0,
+        discountTotal: 10.0,
+      );
+
+      await db.insert('invoices', invoice.toMap());
+
+      final List<Map<String, dynamic>> maps = await db.query('invoices');
+      expect(maps.length, 1);
+
+      final fetchedInvoice = Invoice.fromMap(maps.first);
+      expect(fetchedInvoice.customerId, 1);
+    });
+  });
+}

main.dart

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+import 'package:flutter/material.dart';
+import 'customer_provider.dart';
+import 'product_provider.dart';
+import 'invoice_provider.dart';
+
+void main() {
+  runApp(MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MultiProvider(
+      providers: [
+        ChangeNotifierProvider(create: (_) => CustomerProvider()),
+        ChangeNotifierProvider(create: (_) => ProductProvider()),
+        ChangeNotifierProvider(create: (_) => InvoiceProvider()),
+      ],
+      child: MaterialApp(
+        title: 'Invoice App',
+        theme: ThemeData(
+          primarySwatch: Colors.blue,
+        ),
+        home: HomeScreen(),
+      ),
+    );
+  }
+}
+
+class HomeScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('Invoice App'),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            ElevatedButton(
+              onPressed: () {
+                Navigator.pushNamed(context, '/create_invoice');
+              },
+              child: Text('請求書作成'),
+            ),
+            SizedBox(height: 20),
+            ElevatedButton(
+              onPressed: () {
+                Navigator.pushNamed(context, '/customer_list');
+              },
+              child: Text('顧客一覧'),
+            ),
+            SizedBox(height: 20),
+            ElevatedButton(
+              onPressed: () {
+                Navigator.pushNamed(context, '/product_list');
+              },
+              child: Text('商品一覧'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

path/to/filename.js

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+// entire file content ...
+// ... goes in between

pdf_generator.dart

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+import 'package:flutter/material.dart';
+import 'package:pdf/pdf.dart';
+import 'package:printing/printing.dart';
+
+class PdfGenerator {
+  static Future<void> generatePdf(Invoice invoice, List<InvoiceItem> items) async {
+    final pdf = pw.Document();
+
+    pdf.addPage(
+      pw.Page(
+        build: (pw.Context context) => pw.Column(
+          children: [
+            pw.Text('請求書'),
+            pw.SizedBox(height: 20),
+            pw.Text('顧客名: ${invoice.customerId}'), // 後で顧客名に変更
+            pw.Text('日付: ${invoice.date}'),
+            pw.SizedBox(height: 20),
+            pw.Table(
+              border: pw.TableBorder.all(),
+              children: [
+                pw.TableRow(children: [
+                  pw.Text('商品名'),
+                  pw.Text('数量'),
+                  pw.Text('単価'),
+                  pw.Text('値引き'),
+                  pw.Text('小計'),
+                ]),
+                for (var item in items)
+                  pw.TableRow(children: [
+                    pw.Text(item.productId.toString()), // 後で商品名に変更
+                    pw.Text(item.quantity.toString()),
+                    pw.Text(item.unitPrice.toStringAsFixed(2)),
+                    pw.Text((item.discount * 100).toStringAsFixed(2) + '%'),
+                    pw.Text((item.unitPrice * item.quantity - (item.unitPrice * item.quantity * item.discount)).toStringAsFixed(2)),
+                  ]),
+              ],
+            ),
+            pw.SizedBox(height: 20),
+            pw.Row(
+              mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
+              children: [
+                pw.Text('合計'),
+                pw.Text(invoice.total.toStringAsFixed(2)),
+              ],
+            ),
+            pw.Row(
+              mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
+              children: [
+                pw.Text('税額'),
+                pw.Text(invoice.tax.toStringAsFixed(2)),
+              ],
+            ),
+            pw.Row(
+              mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
+              children: [
+                pw.Text('値引き合計'),
+                pw.Text(invoice.discountTotal.toStringAsFixed(2)),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+
+    await Printing.sharePdf(bytes: pdf.save(), filename: 'invoice.pdf');
+  }
+}

product.dart

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+class Product {
+  final int? id;
+  final String name;
+  final double unitPrice;
+  final double discount;
+
+  Product({
+    this.id,
+    required this.name,
+    required this.unitPrice,
+    required this.discount,
+  });
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'name': name,
+      'unit_price': unitPrice,
+      'discount': discount,
+    };
+  }
+
+  factory Product.fromMap(Map<String, dynamic> map) {
+    return Product(
+      id: map['id'] as int?,
+      name: map['name'] as String,
+      unitPrice: map['unit_price'] as double,
+      discount: map['discount'] as double,
+    );
+  }
+}

product_list_screen.dart

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+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'product_provider.dart';
+
+class ProductListScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final productProvider = Provider.of<ProductProvider>(context);
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('商品一覧'),
+      ),
+      body: FutureBuilder<void>(
+        future: productProvider.fetchProducts(),
+        builder: (context, snapshot) {
+          if (snapshot.connectionState == ConnectionState.waiting) {
+            return Center(child: CircularProgressIndicator());
+          } else {
+            return ListView.builder(
+              itemCount: productProvider.products.length,
+              itemBuilder: (context, index) {
+                final product = productProvider.products[index];
+                return ListTile(
+                  title: Text(product.name),
+                  subtitle: Text('単価: ${product.unitPrice}, 値引き: ${product.discount}'),
+                );
+              },
+            );
+          }
+        },
+      ),
+    );
+  }
+}

product_provider.dart

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+import 'package:flutter/material.dart';
+import 'package:sqflite/sqflite.dart';
+import 'db_helper.dart';
+import 'product.dart';
+
+class ProductProvider with ChangeNotifier {
+  List<Product> _products = [];
+
+  List<Product> get products => _products;
+
+  Future<void> fetchProducts() async {
+    final db = await DbHelper().database;
+    final List<Map<String, dynamic>> maps = await db.query('products');
+    _products = List.generate(maps.length, (i) {
+      return Product.fromMap(maps[i]);
+    });
+    notifyListeners();
+  }
+
+  Future<void> addProduct(Product product) async {
+    final db = await DbHelper().database;
+    await db.insert('products', product.toMap());
+    fetchProducts();
+  }
+
+  // 追加の CRUD メソッドを実装
+}

product_test.dart

@@ -0,0 +1,40 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:path_provider/path_provider.dart';
+import 'db_helper.dart';
+import 'product.dart';
+
+void main() {
+  group('Product Tests', () {
+    late Database db;
+
+    setUp(() async {
+      final io.Directory documentsDirectory = await getApplicationDocumentsDirectory();
+      String path = '${documentsDirectory.path}/test.db';
+      db = await openDatabase(path, version: 1, onCreate: DbHelper()._onCreate);
+    });
+
+    tearDown(() async {
+      await db.close();
+      final io.Directory documentsDirectory = await getApplicationDocumentsDirectory();
+      String path = '${documentsDirectory.path}/test.db';
+      await io.File(path).delete();
+    });
+
+    test('Add and fetch product', () async {
+      final product = Product(
+        name: 'Test Product',
+        unitPrice: 100.0,
+        discount: 0.1,
+      );
+
+      await db.insert('products', product.toMap());
+
+      final List<Map<String, dynamic>> maps = await db.query('products');
+      expect(maps.length, 1);
+
+      final fetchedProduct = Product.fromMap(maps.first);
+      expect(fetchedProduct.name, 'Test Product');
+    });
+  });
+}

pubspec.yaml

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+name: invoice_app
+description: A new Flutter project.
+
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+version: 1.0.0+1
+
+environment:
+  sdk: ">=3.0.0 <4.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  sqflite: ^2.0.0+3
+  path_provider: ^2.0.11
+  pdf: ^3.6.0
+  printing: ^5.9.3
+  provider: ^6.0.0
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter