school-attendance/lib/screens/teacher_register_screen.dart

// 👨‍🏫 교사 회원가입 화면. 교사 인증 코드 확인 후 신규 교사 계정을 생성한다.
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import '../config.dart';

class TeacherRegisterScreen extends StatefulWidget {
  const TeacherRegisterScreen({super.key});

  @override
  State<TeacherRegisterScreen> createState() => _TeacherRegisterScreenState();
}

class _TeacherRegisterScreenState extends State<TeacherRegisterScreen> {
  final _idController = TextEditingController();
  final _pwController = TextEditingController();
  final _nameController = TextEditingController();
  final _secretController = TextEditingController();
  bool _isLoading = false;

  Future<void> _registerTeacher() async {
    String id = _idController.text.trim();
    String pw = _pwController.text.trim();
    String name = _nameController.text.trim();
    String secret = _secretController.text.trim();

    // 💡 테스트용 고유값 (실제 디바이스 UUID 연동 로직이 있다면 그걸 넣으세요)
    String dummyUuid = "TEACHER_PHONE_$id";

    if (id.isEmpty || pw.isEmpty || name.isEmpty || secret.isEmpty) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(const SnackBar(content: Text('⚠️ 모든 빈칸을 입력해 주세요.')));
      return;
    }

    setState(() => _isLoading = true);
    try {
      final response = await http.post(
        Uri.parse('$baseUrl/api/users/register-teacher'),
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({
          "teacherId": id,
          "password": pw,
          "name": name,
          "secretCode": secret,
          "deviceUuid": dummyUuid,
        }),
      );

      final res = jsonDecode(response.body);

      if (response.statusCode == 200 && res['status'] == 'success') {
        ScaffoldMessenger.of(
          context,
        ).showSnackBar(SnackBar(content: Text('✅ ${res['message']}')));
        Navigator.pop(context); // 가입 성공 시 로그인 화면으로 복귀
      } else {
        // 백엔드에서 보낸 에러 메시지(detail 혹은 message) 출력
        String errorMsg = res['detail'] ?? res['message'] ?? '회원가입에 실패했습니다.';
        ScaffoldMessenger.of(
          context,
        ).showSnackBar(SnackBar(content: Text('❌ $errorMsg')));
      }
    } catch (e) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(const SnackBar(content: Text('❌ 서버와 통신에 실패했습니다.')));
    } finally {
      setState(() => _isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('교사 회원가입'),
        backgroundColor: Colors.indigo,
        foregroundColor: Colors.white,
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(24.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text(
              '👨‍🏫 교직원 전용 인증',
              style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 4),
            const Text(
              '학교에서 발급한 교사 가입 비밀코드가 필요합니다.',
              style: TextStyle(color: Colors.grey),
            ),
            const SizedBox(height: 24),
            TextField(
              controller: _secretController,
              obscureText: true,
              decoration: const InputDecoration(
                labelText: '🔑 교사 인증 비밀코드 입력',
                border: OutlineInputBorder(),
              ),
            ),
            const SizedBox(height: 16),
            const Divider(),
            const SizedBox(height: 16),
            TextField(
              controller: _idController,
              decoration: const InputDecoration(
                labelText: '교직원 번호 (ID로 사용)',
                border: OutlineInputBorder(),
              ),
            ),
            const SizedBox(height: 12),
            TextField(
              controller: _nameController,
              decoration: const InputDecoration(
                labelText: '선생님 성함',
                border: OutlineInputBorder(),
              ),
            ),
            const SizedBox(height: 12),
            TextField(
              controller: _pwController,
              obscureText: true,
              decoration: const InputDecoration(
                labelText: '사용할 비밀번호 입력',
                border: OutlineInputBorder(),
              ),
            ),
            const SizedBox(height: 24),
            SizedBox(
              width: double.infinity,
              height: 50,
              child: ElevatedButton(
                style: ElevatedButton.styleFrom(
                  backgroundColor: Colors.indigo,
                  foregroundColor: Colors.white,
                ),
                onPressed: _isLoading ? null : _registerTeacher,
                child: _isLoading
                    ? const CircularProgressIndicator(color: Colors.white)
                    : const Text('교사 계정 생성하기'),
              ),
            ),
          ],
        ),
      ),
    );
  }
}