// Version: 1.0.0
import 'package:flutter/material.dart';

/// 仕入先マスタ画面（Material Design 標準テンプレート）
class SupplierMasterScreen extends StatelessWidget {
  const SupplierMasterScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('仕入先マスタ'),
        actions: [
          IconButton(
            icon: const Icon(Icons.add),
            onPressed: () => _showAddDialog(context),
          ),
        ],
      ),
      body: ListView(
        padding: const EdgeInsets.all(8),
        children: [
          // ヘッダー
          const Padding(
            padding: EdgeInsets.all(8.0),
            child: Text(
              '仕入先名',
              style: TextStyle(fontWeight: FontWeight.bold),
            ),
          ),
          // カードリスト形式（標準 Material 部品）
          ListView.builder(
            shrinkWrap: true,
            padding: EdgeInsets.zero,
            itemCount: 5, // デモ用データ数
            itemBuilder: (context, index) {
              return Card(
                margin: const EdgeInsets.symmetric(vertical: 4),
                child: ListTile(
                  leading: CircleAvatar(
                    backgroundColor: Colors.brown.shade100,
                    child: Icon(Icons.shopping_bag, color: Colors.brown),
                  ),
                  title: Text('サプライヤー${index + 1}'),
                  subtitle: Text('契約先：2025-12-31 以降'),
                  trailing: Row(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      IconButton(
                        icon: const Icon(Icons.edit),
                        onPressed: () => _showEditDialog(context, index),
                      ),
                      IconButton(
                        icon: const Icon(Icons.delete),
                        onPressed: () => _showDeleteDialog(context, index),
                      ),
                    ],
                  ),
                ),
              );
            },
          ),
        ],
      ),
    );
  }

  void _showAddDialog(BuildContext context) {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('新規仕入先登録'),
        content: SingleChildScrollView(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextField(
                decoration: const InputDecoration(
                  labelText: '会社名',
                  hintText: '株式会社名を入力',
                ),
              ),
              const SizedBox(height: 8),
              TextField(
                decoration: const InputDecoration(
                  labelText: '代表者名',
                ),
              ),
              const SizedBox(height: 8),
              TextField(
                decoration: const InputDecoration(
                  labelText: '住所',
                  hintText: '〒000-0000 北海道...',
                ),
              ),
              const SizedBox(height: 8),
              TextField(
                decoration: const InputDecoration(
                  labelText: '電話番号',
                  hintText: '0123-456789',
                ),
                keyboardType: TextInputType.phone,
              ),
              const SizedBox(height: 8),
              TextField(
                decoration: const InputDecoration(
                  labelText: '担当者名',
                ),
              ),
              const SizedBox(height: 8),
              TextField(
                decoration: const InputDecoration(
                  labelText: '取引条件',
                  hintText: '例：1/30 支払期限',
                ),
              ),
            ],
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: const Text('キャンセル'),
          ),
          ElevatedButton(
            onPressed: () {
              Navigator.pop(ctx);
              ScaffoldMessenger.of(context).showSnackBar(
                const SnackBar(content: Text('仕入先登録しました')),
              );
            },
            child: const Text('保存'),
          ),
        ],
      ),
    );
  }

  void _showEditDialog(BuildContext context, int index) {
    // 編集ダイアログ（構造は新規と同様）
  }

  void _showDeleteDialog(BuildContext context, int index) {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('仕入先削除'),
        content: Text('サプライヤー${index + 1}を削除しますか？'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx),
            child: const Text('キャンセル'),
          ),
          ElevatedButton(
            onPressed: () {
              Navigator.pop(ctx);
              ScaffoldMessenger.of(context).showSnackBar(
                const SnackBar(content: Text('仕入先削除しました')),
              );
            },
            style: ElevatedButton.styleFrom(backgroundColor: Colors.red),
            child: const Text('削除'),
          ),
        ],
      ),
    );
  }
}