import 'package:flutter/material.dart';
import 'package:mysql_client/mysql_client.dart';
import 'dart:async';
import 'dart:math';
import 'package:mailer/mailer.dart';
import 'package:mailer/smtp_server.dart';
import 'package:validators/validators.dart' as validator;

void main() {
  runApp(MaterialApp(
    home: ForgetPasswordPage(),
  ));
}

class ForgetPasswordPage extends StatefulWidget {
  @override
  _ForgetPasswordPageState createState() => _ForgetPasswordPageState();
}

class _ForgetPasswordPageState extends State<ForgetPasswordPage> {
  late FocusNode _emailFocusNode;
  final TextEditingController _emailController = TextEditingController();

  bool _isButtonEnabled = true;
  String _generatedCode = ''; // 用來存儲生成的臨時密碼

  @override
  void initState() {
    super.initState();
    _fetchData();
    _emailFocusNode = FocusNode();
  }

  void _fetchData() async {
    final conn = await MySQLConnection.createConnection(
      host: '203.64.84.154',
      port: 33061,
      userName: 'root',
      password: 'Topic@2024',
      databaseName: 'care',
    );
    await conn.connect();
  }

  String _generateVerificationCode() {
    final random = Random();
    const availableChars = '0123456789';
    return List.generate(
        6, (index) => availableChars[random.nextInt(availableChars.length)])
        .join();
  }

  Future<void> _sendEmail(String recipientEmail, String code) async {
    final smtpServer = SmtpServer(
      'smtp.gmail.com',
      port: 587,
      username: 'kueikuei8011@gmail.com',
      password: 'yqns onwf tydq obzl',
      ssl: false,
      allowInsecure: false,
    );

    final message = Message()
      ..from = Address('kueikuei8011@gmail.com', 'Kuei')
      ..recipients.add(recipientEmail)
      ..subject = '您的臨時密碼'
      ..text = '您的臨時密碼是: $code';

    try {
      await send(message, smtpServer);
      print('臨時密碼發送成功');
    } catch (e) {
      print('臨時密碼發送失敗: $e');
    }
  }

  void _sendVerificationCode() async {// 發送並更新資料庫中的密碼
    final email = _emailController.text;
    if (email.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('請輸入電子信箱地址')),
      );
      return;
    } else if (!validator.isEmail(email)) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('請輸入正確的電子信箱')),
      );
      _emailFocusNode.requestFocus();
      return;
    }

    //_generatedCode = _generateVerificationCode();
    //_sendEmail(email, _generatedCode);

    final conn = await MySQLConnection.createConnection(
      host: '203.64.84.154',
      port: 33061,
      userName: 'root',
      password: 'Topic@2024',
      databaseName: 'care',
    );
    await conn.connect();
    try {
      var result = await conn.execute(
        'SELECT * FROM HomeLogin WHERE homeEmail = :email',
        {'email': email},
      );

      if (result.rows.isEmpty) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('失敗')),
        );
      } else {

        _generatedCode = _generateVerificationCode();
        await conn.execute(
          'UPDATE HomeLogin SET homePassword = :tempPassword WHERE homeEmail = :email',
          {'tempPassword': _generatedCode, 'email': email},
        );

        // 發送臨時密碼到用戶電子信箱
        _sendEmail(email, _generatedCode);

        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('臨時密碼已發送到您的電子信箱')),
        );

        _emailController.clear();
      }
    } catch (e) {
      print('資料庫錯誤: $e');
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('註冊失敗：系統錯誤')),
      );
    } finally {
      await conn.close();
    }
  }

  @override
  void dispose() {
    super.dispose();
    _emailFocusNode.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            child: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 32.0),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Container(
                    margin: EdgeInsets.only(bottom: 40),
                    height: 100,
                    child: Icon(
                      Icons.account_circle,
                      size: 100,
                      color: Color(0xFF4FC3F7),
                    ),
                  ),
                  Text(
                    '全方位照護守護者',
                    style: TextStyle(
                      fontSize: 32,
                      fontWeight: FontWeight.bold,
                      color: Colors.black,
                    ),
                  ),
                  SizedBox(height: 20),
                  TextField(
                    controller: _emailController,
                    focusNode: _emailFocusNode,
                    decoration: InputDecoration(
                      border: OutlineInputBorder(),
                      prefixIcon: Icon(Icons.email_outlined),
                      labelText: '電子信箱',
                    ),
                    keyboardType: TextInputType.emailAddress,
                  ),
                  SizedBox(height: 20),

                  ElevatedButton(
                    onPressed:  _sendVerificationCode,
                    child: Text('送出'),
                    style: ElevatedButton.styleFrom(
                      backgroundColor: Color(0xFF4FC3F7),
                      padding:
                      EdgeInsets.symmetric(horizontal: 50, vertical: 15),
                      textStyle: TextStyle(fontSize: 18),
                    ),
                  ),
                  SizedBox(height: 10),
                  ElevatedButton(
                    onPressed: () {
                      Navigator.pop(context);
                    },
                    child: Text('取消'),
                    style: TextButton.styleFrom(
                      backgroundColor: Colors.transparent,
                      textStyle: TextStyle(fontSize: 18),
                      shadowColor: Colors.transparent,
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}