import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import '../../core/network/api_exception.dart';
import '../../core/theme/app_theme.dart';
import '../../providers/auth_provider.dart';
import '../../services/auth_service.dart';

/// 登录页：账号（手机号/邮箱，含@自动识别）+ 密码登录
class LoginScreen extends ConsumerStatefulWidget {
  const LoginScreen({super.key});

  @override
  ConsumerState<LoginScreen> createState() => _LoginScreenState();
}

class _LoginScreenState extends ConsumerState<LoginScreen> {
  final _phone = TextEditingController();
  final _password = TextEditingController();
  bool _loading = false;
  String? _error;

  Future<void> _submit() async {
    final account = _phone.text.trim();
    final password = _password.text;
    if (account.isEmpty || password.isEmpty) {
      setState(() => _error = '请输入账号和密码');
      return;
    }
    setState(() {
      _loading = true;
      _error = null;
    });
    try {
      // 含 @ 视为邮箱登录，否则手机号登录（服务端两种都支持密码登录）
      final isEmail = account.contains('@');
      final result = await AuthService.login(
        type: isEmail ? 'email_password' : 'phone_password',
        phone: isEmail ? null : account,
        email: isEmail ? account : null,
        password: password,
      );
      await ref.read(authProvider.notifier).onLoginSuccess(result.user);
      if (mounted) context.go('/home');
    } on ApiException catch (e) {
      setState(() => _error = e.message);
    } catch (_) {
      setState(() => _error = '网络异常，请稍后重试');
    } finally {
      if (mounted) setState(() => _loading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('登录')),
      body: SafeArea(
        child: ListView(
          padding: const EdgeInsets.all(24),
          children: [
            const SizedBox(height: 32),
            const Text(
              '欢迎回来',
              style: TextStyle(fontSize: 26, fontWeight: FontWeight.w700),
            ),
            const SizedBox(height: 32),
            TextField(
              controller: _phone,
              keyboardType: TextInputType.emailAddress,
              decoration: const InputDecoration(hintText: '手机号 / 邮箱'),
            ),
            const SizedBox(height: 16),
            TextField(
              controller: _password,
              obscureText: true,
              decoration: const InputDecoration(hintText: '密码'),
            ),
            if (_error != null) ...[
              const SizedBox(height: 12),
              Text(_error!, style: const TextStyle(color: AppColors.primary, fontSize: 13)),
            ],
            const SizedBox(height: 24),
            ElevatedButton(
              onPressed: _loading ? null : _submit,
              child: _loading
                  ? const SizedBox(
                      height: 20,
                      width: 20,
                      child: CircularProgressIndicator(strokeWidth: 2),
                    )
                  : const Text('登录'),
            ),
            const SizedBox(height: 16),
            TextButton(
              onPressed: () => context.push('/register'),
              child: const Text(
                '没有账号？去注册',
                style: TextStyle(color: AppColors.textSecondary),
              ),
            ),
          ],
        ),
      ),
    );
  }
}