import 'package:flutter/cupertino.dart';
import 'package:get/get.dart';

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

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final _formKey = GlobalKey<FormState>();
  final _usernameController = TextEditingController();
  final _passwordController = TextEditingController();
  final _phoneController = TextEditingController();
  final _smsCodeController = TextEditingController();
  bool _isLoading = false;
  bool _isSmsLogin = false;
  bool _isCountdownRunning = false;
  int _countdownSeconds = 0;

  @override
  void dispose() {
    _usernameController.dispose();
    _passwordController.dispose();
    _phoneController.dispose();
    _smsCodeController.dispose();
    super.dispose();
  }

  Future<void> _handleLogin() async {
    if (!_formKey.currentState!.validate()) {
      return;
    }

    setState(() {
      _isLoading = true;
    });

    await Future.delayed(const Duration(seconds: 1));

    setState(() {
      _isLoading = false;
    });

    if (mounted) {
      Get.offAllNamed('/home');
    }
  }

  Future<void> _sendSmsCode() async {
    if (_phoneController.text.isEmpty) {
      showCupertinoDialog(
        context: context,
        builder: (context) => CupertinoAlertDialog(
          title: const Text('提示'),
          content: const Text('请先输入手机号'),
          actions: [
            CupertinoDialogAction(
              child: const Text('确定'),
              onPressed: () => Navigator.pop(context),
            ),
          ],
        ),
      );
      return;
    }

    setState(() {
      _isCountdownRunning = true;
      _countdownSeconds = 60;
    });

    await Future.delayed(const Duration(seconds: 1));

    while (_countdownSeconds > 0 && mounted) {
      await Future.delayed(const Duration(seconds: 1));
      setState(() {
        _countdownSeconds--;
      });
    }

    if (mounted) {
      setState(() {
        _isCountdownRunning = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: const CupertinoNavigationBar(
        middle: Text('登录'),
      ),
      child: SafeArea(
        child: Padding(
          padding: const EdgeInsets.all(24.0),
          child: Form(
            key: _formKey,
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                const Icon(
                  CupertinoIcons.person_3,
                  size: 80,
                  color: CupertinoColors.activeBlue,
                ),
                const SizedBox(height: 32),
                const Text(
                  '欢迎回来',
                  style: TextStyle(
                    fontSize: 28,
                    fontWeight: FontWeight.bold,
                  ),
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 8),
                Text(
                  _isSmsLogin ? '使用手机号验证码登录' : '请登录您的账户',
                  style: TextStyle(
                    fontSize: 16,
                    color: CupertinoColors.inactiveGray,
                  ),
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 48),
                CupertinoSlidingSegmentedControl<bool>(
                  groupValue: _isSmsLogin,
                  onValueChanged: (value) {
                    if (value != null) {
                      setState(() {
                        _isSmsLogin = value;
                      });
                    }
                  },
                  children: const {
                    false: Padding(
                      padding: EdgeInsets.symmetric(horizontal: 16),
                      child: Text('密码登录'),
                    ),
                    true: Padding(
                      padding: EdgeInsets.symmetric(horizontal: 16),
                      child: Text('短信登录'),
                    ),
                  },
                ),
                const SizedBox(height: 24),
                if (!_isSmsLogin) ...[
                  CupertinoFormSection.insetGrouped(
                    children: [
                      CupertinoTextFormFieldRow(
                        controller: _usernameController,
                        prefix: const Padding(
                          padding: EdgeInsets.only(left: 8),
                          child: Icon(CupertinoIcons.person, size: 20),
                        ),
                        placeholder: '请输入用户名',
                        validator: (value) {
                          if (value == null || value.isEmpty) {
                            return '请输入用户名';
                          }
                          return null;
                        },
                      ),
                    ],
                  ),
                  const SizedBox(height: 16),
                  CupertinoFormSection.insetGrouped(
                    children: [
                      CupertinoTextFormFieldRow(
                        controller: _passwordController,
                        obscureText: true,
                        prefix: const Padding(
                          padding: EdgeInsets.only(left: 8),
                          child: Icon(CupertinoIcons.lock, size: 20),
                        ),
                        placeholder: '请输入密码',
                        validator: (value) {
                          if (value == null || value.isEmpty) {
                            return '请输入密码';
                          }
                          if (value.length < 6) {
                            return '密码至少6位';
                          }
                          return null;
                        },
                      ),
                    ],
                  ),
                ] else ...[
                  CupertinoFormSection.insetGrouped(
                    children: [
                      CupertinoTextFormFieldRow(
                        controller: _phoneController,
                        keyboardType: TextInputType.phone,
                        prefix: const Padding(
                          padding: EdgeInsets.only(left: 8),
                          child: Icon(CupertinoIcons.phone, size: 20),
                        ),
                        placeholder: '请输入手机号',
                        validator: (value) {
                          if (value == null || value.isEmpty) {
                            return '请输入手机号';
                          }
                          if (value.length != 11) {
                            return '请输入有效的手机号';
                          }
                          return null;
                        },
                      ),
                    ],
                  ),
                  const SizedBox(height: 16),
                  Row(
                    children: [
                      Expanded(
                        child: CupertinoFormSection.insetGrouped(
                          children: [
                            CupertinoTextFormFieldRow(
                              controller: _smsCodeController,
                              keyboardType: TextInputType.number,
                              prefix: const Padding(
                                padding: EdgeInsets.only(left: 8),
                                child: Icon(CupertinoIcons.shield, size: 20),
                              ),
                              placeholder: '请输入验证码',
                              validator: (value) {
                                if (value == null || value.isEmpty) {
                                  return '请输入验证码';
                                }
                                if (value.length != 6) {
                                  return '验证码为6位';
                                }
                                return null;
                              },
                            ),
                          ],
                        ),
                      ),
                      const SizedBox(width: 12),
                      SizedBox(
                        width: 120,
                        height: 50,
                        child: CupertinoButton.filled(
                          onPressed: _isCountdownRunning ? null : _sendSmsCode,
                          borderRadius: BorderRadius.circular(12),
                          padding: EdgeInsets.zero,
                          child: Text(
                            _isCountdownRunning ? '${_countdownSeconds}s' : '获取验证码',
                            style: const TextStyle(fontSize: 14),
                          ),
                        ),
                      ),
                    ],
                  ),
                ],
                const SizedBox(height: 32),
                CupertinoButton.filled(
                  onPressed: _isLoading ? null : _handleLogin,
                  padding: const EdgeInsets.symmetric(vertical: 14),
                  borderRadius: BorderRadius.circular(12),
                  child: _isLoading
                      ? const SizedBox(
                    height: 20,
                    width: 20,
                    child: CupertinoActivityIndicator(
                      radius: 10,
                    ),
                  )
                      : Text(
                    _isSmsLogin ? '验证码登录' : '登录',
                    style: const TextStyle(fontSize: 17),
                  ),
                ),
                const SizedBox(height: 16),
                CupertinoButton(
                  onPressed: () {
                    Get.offAndToNamed('/register');
                  },
                  child: const Text('还没有账户？立即注册'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}