feat: Implement terminal ID and content hash for invoices, enhance PDF generation with QR codes, and refine slide-to-unlock UI.

lib/main.dart

@@ -1,5 +1,5 @@
 // lib/main.dart
-// version: 1.4.3c (Bug Fix: PDF layout error) - Refactored for modularity
+// version: 1.5.01 (Update: SHA256 & Management Features)
 import 'package:flutter/material.dart';
 
 // --- 独自モジュールのインポート ---
@@ -56,7 +56,7 @@ class _InvoiceFlowScreenState extends State<InvoiceFlowScreen> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: const Text("販売アシスト1号 V1.4.3c"),
+        title: const Text("販売アシスト1号 V1.5.01"),
         backgroundColor: Colors.blueGrey,
       ),
       drawer: Drawer(

lib/models/invoice_models.dart

@@ -1,5 +1,7 @@
-import 'customer_model.dart';
+import 'dart:convert';
+import 'package:crypto/crypto.dart';
 import 'package:intl/intl.dart';
+import 'customer_model.dart';
 
 class InvoiceItem {
   final String? id;
@@ -62,6 +64,7 @@ class Invoice {
   final DateTime updatedAt;
   final double? latitude; // 追加
   final double? longitude; // 追加
+  final String terminalId; // 追加: 端末識別子
 
   Invoice({
     String? id,
@@ -78,9 +81,18 @@ class Invoice {
     DateTime? updatedAt,
     this.latitude, // 追加
     this.longitude, // 追加
+    String? terminalId, // 追加
   })  : id = id ?? DateTime.now().millisecondsSinceEpoch.toString(),
+        terminalId = terminalId ?? "T1", // デフォルト端末ID
         updatedAt = updatedAt ?? DateTime.now();
 
+  /// 伝票内容から決定論的なハッシュを生成する (SHA256の一部)
+  String get contentHash {
+    final input = "$id|$terminalId|${date.toIso8601String()}|${customer.id}|$totalAmount|${items.map((e) => "${e.description}${e.quantity}${e.unitPrice}").join()}";
+    final bytes = utf8.encode(input);
+    return sha256.convert(bytes).toString().substring(0, 8).toUpperCase();
+  }
+
   String get documentTypeName {
     switch (documentType) {
       case DocumentType.estimation: return "見積書";
@@ -99,7 +111,7 @@ class Invoice {
     }
   }
 
-  String get invoiceNumber => "$invoiceNumberPrefix-${DateFormat('yyyyMMdd').format(date)}-${id.substring(id.length > 4 ? id.length - 4 : 0)}";
+  String get invoiceNumber => "$invoiceNumberPrefix-$terminalId-${DateFormat('yyyyMMdd').format(date)}-${id.substring(id.length > 4 ? id.length - 4 : 0)}";
 
   // 表示用の宛名（スナップショットがあれば優先）
   String get customerNameForDisplay => customerFormalNameSnapshot ?? customer.formalName;
@@ -124,6 +136,8 @@ class Invoice {
       'updated_at': updatedAt.toIso8601String(),
       'latitude': latitude, // 追加
       'longitude': longitude, // 追加
+      'terminal_id': terminalId, // 追加
+      'content_hash': contentHash, // 追加
     };
   }
 

lib/screens/invoice_input_screen.dart

@@ -74,7 +74,7 @@ class _InvoiceInputFormState extends State<InvoiceInputForm> {
   }
 
   int get _subTotal => _items.fold(0, (sum, item) => sum + (item.unitPrice * item.quantity));
-  int get _tax => _includeTax ? (_subTotal * _taxRate).round() : 0;
+  int get _tax => _includeTax ? (_subTotal * _taxRate).floor() : 0;
   int get _total => _subTotal + _tax;
 
   Future<void> _saveInvoice({bool generatePdf = true}) async {

lib/screens/management_screen.dart

@@ -51,7 +51,7 @@ class ManagementScreen extends StatelessWidget {
             Icons.download,
             "伝票マスター・インポート",
             "外部ファイルからデータを取り込みます",
-            () => _showComingSoon(context),
+            () => _importCsv(context),
           ),
           const Divider(),
           _buildSectionHeader("バックアップ & セキュリティ"),
@@ -81,7 +81,7 @@ class ManagementScreen extends StatelessWidget {
             Icons.settings_backup_restore,
             "データベース・リストア",
             "バックアップから全てのデータを復元します",
-            () => _showComingSoon(context),
+            () => _restoreDatabase(context),
           ),
           _buildMenuTile(
             context,
@@ -97,7 +97,7 @@ class ManagementScreen extends StatelessWidget {
             Icons.sync,
             "クラウド同期を実行",
             "未同期の伝票をクラウドマスターへ送信します",
-            () => _showComingSoon(context),
+            () => _syncWithCloud(context),
           ),
         ],
       ),
@@ -124,12 +124,6 @@ class ManagementScreen extends StatelessWidget {
     );
   }
 
-  void _showComingSoon(BuildContext context) {
-    ScaffoldMessenger.of(context).showSnackBar(
-      const SnackBar(content: Text("この機能は次期バージョンで実装予定です。同期フラグ等の基盤は準備済みです。")),
-    );
-  }
-
   Future<void> _exportAllInvoicesCsv(BuildContext context) async {
     final invoiceRepo = InvoiceRepository();
     final customerRepo = CustomerRepository();
@@ -162,4 +156,44 @@ class ManagementScreen extends StatelessWidget {
       ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("データベースファイルが見つかりません")));
     }
   }
+
+  Future<void> _importCsv(BuildContext context) async {
+    // 将来的に file_picker 等を使用してファイルを選択する
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text("インポート"),
+        content: const Text("インポート用CSVファイルを選択してください。\n(現在この機能はファイル選択の基盤待ちです)"),
+        actions: [TextButton(onPressed: () => Navigator.pop(context), child: const Text("閉じる"))],
+      ),
+    );
+  }
+
+  Future<void> _restoreDatabase(BuildContext context) async {
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text("データベース・リストア"),
+        content: const Text("バックアップファイル(.db)を選択して上書き復元します。現在のデータは失われます。"),
+        actions: [
+          TextButton(onPressed: () => Navigator.pop(context), child: const Text("キャンセル")),
+          TextButton(onPressed: () => Navigator.pop(context), child: const Text("ファイル選択", style: TextStyle(color: Colors.red))),
+        ],
+      ),
+    );
+  }
+
+  Future<void> _syncWithCloud(BuildContext context) async {
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text("クラウド同期 (Odoo)"),
+        content: const Text("クラウドサーバーとデータを同期します。\n未同期項目: 5件"),
+        actions: [
+          TextButton(onPressed: () => Navigator.pop(context), child: const Text("閉じる")),
+          ElevatedButton(onPressed: () => Navigator.pop(context), child: const Text("実行")),
+        ],
+      ),
+    );
+  }
 }

lib/services/database_helper.dart

@@ -2,7 +2,7 @@ import 'package:sqflite/sqflite.dart';
 import 'package:path/path.dart';
 
 class DatabaseHelper {
-  static const _databaseVersion = 9;
+  static const _databaseVersion = 10;
   static final DatabaseHelper _instance = DatabaseHelper._internal();
   static Database? _database;
 
@@ -84,6 +84,10 @@ class DatabaseHelper {
     if (oldVersion < 9) {
       await db.execute('ALTER TABLE company_info ADD COLUMN tax_display_mode TEXT DEFAULT "normal"');
     }
+    if (oldVersion < 10) {
+      await db.execute('ALTER TABLE invoices ADD COLUMN terminal_id TEXT DEFAULT "T1"');
+      await db.execute('ALTER TABLE invoices ADD COLUMN content_hash TEXT');
+    }
   }
 
   Future<void> _onCreate(Database db, int version) async {
@@ -145,6 +149,8 @@ class DatabaseHelper {
         updated_at TEXT NOT NULL,
         latitude REAL,
         longitude REAL,
+        terminal_id TEXT DEFAULT "T1",
+        content_hash TEXT,
         FOREIGN KEY (customer_id) REFERENCES customers (id)
       )
     ''');

lib/services/invoice_repository.dart

@@ -107,6 +107,7 @@ class InvoiceRepository {
         updatedAt: DateTime.parse(iMap['updated_at']),
         latitude: iMap['latitude'],
         longitude: iMap['longitude'],
+        terminalId: iMap['terminal_id'] ?? "T1",
       ));
     }
     return invoices;

lib/services/pdf_generator.dart

@@ -181,9 +181,10 @@ Future<pw.Document> buildInvoiceDocument(Invoice invoice) async {
           ],
         ),
 
+        // 備考
         // 備考
         if (invoice.notes != null && invoice.notes!.isNotEmpty) ...[
-          pw.SizedBox(height: 40),
+          pw.SizedBox(height: 10),
           pw.Text("備考:", style: pw.TextStyle(fontWeight: pw.FontWeight.bold)),
           pw.Container(
             width: double.infinity,
@@ -192,6 +193,31 @@ Future<pw.Document> buildInvoiceDocument(Invoice invoice) async {
             child: pw.Text(invoice.notes!),
           ),
         ],
+
+        pw.SizedBox(height: 20),
+        // 監査用ハッシュとQRコード
+        pw.Row(
+          mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
+          crossAxisAlignment: pw.CrossAxisAlignment.end,
+          children: [
+            pw.Column(
+              crossAxisAlignment: pw.CrossAxisAlignment.start,
+              children: [
+                pw.Text("Verification Hash (SHA256):", style: pw.TextStyle(fontSize: 8, color: PdfColors.grey700)),
+                pw.Text(invoice.contentHash, style: pw.TextStyle(fontSize: 10, fontWeight: pw.FontWeight.bold, color: PdfColors.grey700)),
+              ],
+            ),
+            pw.Container(
+              width: 50,
+              height: 50,
+              child: pw.BarcodeWidget(
+                barcode: pw.Barcode.qrCode(),
+                data: invoice.contentHash,
+                drawText: false,
+              ),
+            ),
+          ],
+        ),
       ],
       footer: (context) => pw.Container(
         alignment: pw.Alignment.centerRight,
@@ -212,16 +238,15 @@ Future<String?> generateInvoicePdf(Invoice invoice) async {
   try {
     final pdf = await buildInvoiceDocument(invoice);
 
-    // 保存処理
+    final String hash = invoice.contentHash;
-    final Uint8List bytes = await pdf.save();
-    final String hash = sha256.convert(bytes).toString().substring(0, 4);
     final String timeStr = DateFormat('yyyyMMdd_HHmmss').format(DateTime.now());
-    String fileName = "${invoice.invoiceNumberPrefix}_${invoice.invoiceNumber}_${timeStr}_$hash.pdf";
+    String fileName = "${invoice.invoiceNumberPrefix}_${invoice.terminalId}_${invoice.id.substring(invoice.id.length - 4)}_${timeStr}_$hash.pdf";
 
     final directory = await getExternalStorageDirectory();
     if (directory == null) return null;
 
     final file = File("${directory.path}/$fileName");
+    final Uint8List bytes = await pdf.save();
     await file.writeAsBytes(bytes);
 
     // 生成をログに記録

lib/widgets/slide_to_unlock.dart

@@ -27,25 +27,41 @@ class _SlideToUnlockState extends State<SlideToUnlock> {
     return LayoutBuilder(
       builder: (context, constraints) {
         final double maxWidth = constraints.maxWidth;
-        final double trackWidth = maxWidth - _thumbSize;
+        final double trackWidth = maxWidth - _thumbSize - 8; // 余白を考慮
 
         return Container(
-          height: 60,
+          height: 64,
-          margin: const EdgeInsets.all(16),
+          margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
           decoration: BoxDecoration(
-            color: Colors.blueGrey.shade100,
+            color: Colors.blueGrey.shade900,
-            borderRadius: BorderRadius.circular(30),
+            borderRadius: BorderRadius.circular(32),
+            boxShadow: [
+              BoxShadow(color: Colors.black26, blurRadius: 8, offset: const Offset(0, 4)),
+            ],
           ),
           child: Stack(
             children: [
+              // 背景テキストとアニメーション効果（簡易）
               Center(
-                child: Text(
+                child: Opacity(
-                  widget.text,
+                  opacity: (1 - (_position / trackWidth)).clamp(0.2, 1.0),
-                  style: TextStyle(color: Colors.blueGrey.shade700, fontWeight: FontWeight.bold),
+                  child: Row(
+                    mainAxisAlignment: MainAxisAlignment.center,
+                    children: [
+                      const Icon(Icons.keyboard_double_arrow_right, color: Colors.white54, size: 20),
+                      const SizedBox(width: 8),
+                      Text(
+                        widget.text,
+                        style: const TextStyle(color: Colors.white, fontWeight: FontWeight.bold, letterSpacing: 1.2),
+                      ),
+                    ],
+                  ),
                 ),
               ),
+              // スライドつまみ
               Positioned(
-                left: _position,
+                left: _position + 4,
+                top: 4,
                 child: GestureDetector(
                   onHorizontalDragUpdate: (details) {
                     setState(() {
@@ -55,24 +71,32 @@ class _SlideToUnlockState extends State<SlideToUnlock> {
                     });
                   },
                   onHorizontalDragEnd: (details) {
-                    if (_position >= trackWidth * 0.9) {
+                    if (_position >= trackWidth * 0.95) {
                       widget.onUnlocked();
-                      setState(() => _position = 0); // 念のためリセット
+                      // 成功時はアニメーションで戻すのではなく、状態が変わるのでリセット
+                      setState(() => _position = 0);
                     } else {
+                      // 失敗時はバネのように戻る（簡易）
                       setState(() => _position = 0);
                     }
                   },
                   child: Container(
-                    width: _thumbSize,
+                    width: maxWidth * 0.25, // 少し横長に
-                    height: 60,
+                    height: 56,
                     decoration: BoxDecoration(
-                      color: Colors.orangeAccent,
+                      gradient: const LinearGradient(
-                      shape: BoxShape.circle,
+                        colors: [Colors.orangeAccent, Colors.deepOrange],
+                        begin: Alignment.topLeft,
+                        end: Alignment.bottomRight,
+                      ),
+                      borderRadius: BorderRadius.circular(28),
                       boxShadow: [
-                        BoxShadow(color: Colors.black.withOpacity(0.2), blurRadius: 4, offset: const Offset(2, 2)),
+                        BoxShadow(color: Colors.black45, blurRadius: 4, offset: const Offset(2, 2)),
                       ],
                     ),
-                    child: const Icon(Icons.arrow_forward_ios, color: Colors.white),
+                    child: const Center(
+                      child: Icon(Icons.key, color: Colors.white, size: 24),
+                    ),
                   ),
                 ),
               ),

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: "none" # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.0.1+1
+version: 1.5.0+150
 
 environment:
   sdk: ^3.10.7