import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import '../../../core/router/routes.dart';
import '../../../core/constants/app_colors.dart';
import '../../../core/error/exceptions.dart';
import '../../providers/user_providers.dart';

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

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

class _LoginPageState extends ConsumerState<LoginPage> {
  // 设计色彩 - 与导航页面统一
  static const Color _orange = Color(0xFFFF6B00);

  final _formKey = GlobalKey<FormState>();
  final _phoneController = TextEditingController();
  final _passwordController = TextEditingController();

  bool _obscurePassword = true;

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

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

    final phone = _phoneController.text.trim();

    try {
      // 仅支持密码登录
      await ref.read(userNotifierProvider.notifier).loginWithPassword(
        phone,
        _passwordController.text,
      );

      if (mounted) {
        context.go(Routes.contribution);
      }
    } catch (e) {
      if (!mounted) return;
      final message = e is UnauthorizedException
          ? e.message
          : e is ForbiddenException
              ? e.message
              : e is NetworkException
                  ? e.message
                  : e.toString().replaceFirst(RegExp(r'^[A-Za-z]+Exception:\s*'), '');

      ScaffoldMessenger.of(context).clearSnackBars();
      if (message.contains('锁定')) {
        // 账户已锁定 → 弹窗 + 找回密码（5秒后自动关闭）
        showDialog<void>(
          context: context,
          builder: (ctx) {
            Timer(const Duration(seconds: 5), () {
              if (ctx.mounted) Navigator.of(ctx, rootNavigator: true).maybePop();
            });
            return AlertDialog(
              title: const Text('账户已锁定'),
              content: Text(message),
              actions: [
                TextButton(
                  onPressed: () => Navigator.pop(ctx),
                  child: Text('知道了', style: TextStyle(color: AppColors.textSecondaryOf(context))),
                ),
                ElevatedButton(
                  onPressed: () {
                    Navigator.pop(ctx);
                    context.push(Routes.forgotPassword, extra: _phoneController.text.trim());
                  },
                  style: ElevatedButton.styleFrom(backgroundColor: _orange),
                  child: const Text('找回密码', style: TextStyle(color: Colors.white)),
                ),
              ],
            );
          },
        );
      } else if (message.contains('还剩')) {
        // 密码错误但还有机会 → SnackBar 提醒 + 找回密码入口
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text(message),
            backgroundColor: Colors.orange.shade800,
            duration: const Duration(seconds: 5),
            action: SnackBarAction(
              label: '找回密码',
              textColor: Colors.white,
              onPressed: () => context.push(Routes.forgotPassword, extra: _phoneController.text.trim()),
            ),
          ),
        );
      } else {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text(message)),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final userState = ref.watch(userNotifierProvider);
    final isDark = AppColors.isDark(context);

    return Scaffold(
      backgroundColor: AppColors.backgroundOf(context),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                const SizedBox(height: 60),

                // Logo
                Center(
                  child: Container(
                    width: 80,
                    height: 80,
                    decoration: BoxDecoration(
                      color: _orange.withOpacity(isDark ? 0.2 : 0.1),
                      borderRadius: BorderRadius.circular(20),
                    ),
                    child: const Icon(
                      Icons.eco,
                      size: 48,
                      color: _orange,
                    ),
                  ),
                ),

                const SizedBox(height: 24),

                Text(
                  '欢迎回来',
                  style: TextStyle(
                    fontSize: 28,
                    fontWeight: FontWeight.bold,
                    color: AppColors.textPrimaryOf(context),
                  ),
                  textAlign: TextAlign.center,
                ),

                const SizedBox(height: 8),

                Text(
                  '登录您的股行账户',
                  style: TextStyle(
                    fontSize: 16,
                    color: AppColors.textSecondaryOf(context),
                  ),
                  textAlign: TextAlign.center,
                ),

                const SizedBox(height: 48),

                // 仅显示密码登录（验证码登录已隐藏）

                const SizedBox(height: 24),

                // 手机号
                TextFormField(
                  controller: _phoneController,
                  keyboardType: TextInputType.phone,
                  style: TextStyle(color: AppColors.textPrimaryOf(context)),
                  decoration: InputDecoration(
                    labelText: '手机号',
                    labelStyle: TextStyle(color: AppColors.textSecondaryOf(context)),
                    prefixIcon: Icon(Icons.phone_outlined, color: AppColors.textSecondaryOf(context)),
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                      borderSide: BorderSide(color: AppColors.borderOf(context)),
                    ),
                    enabledBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                      borderSide: BorderSide(color: AppColors.borderOf(context)),
                    ),
                    focusedBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                      borderSide: const BorderSide(color: _orange, width: 2),
                    ),
                    filled: true,
                    fillColor: AppColors.cardOf(context),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return '请输入手机号';
                    }
                    if (!RegExp(r'^1[3-9]\d{9}$').hasMatch(value)) {
                      return '请输入正确的手机号';
                    }
                    return null;
                  },
                ),

                const SizedBox(height: 16),

                // 密码输入
                TextFormField(
                  controller: _passwordController,
                  obscureText: _obscurePassword,
                  style: TextStyle(color: AppColors.textPrimaryOf(context)),
                  decoration: InputDecoration(
                    labelText: '密码',
                    labelStyle: TextStyle(color: AppColors.textSecondaryOf(context)),
                    prefixIcon: Icon(Icons.lock_outline, color: AppColors.textSecondaryOf(context)),
                    suffixIcon: IconButton(
                      icon: Icon(
                        _obscurePassword ? Icons.visibility_off_outlined : Icons.visibility_outlined,
                        color: AppColors.textSecondaryOf(context),
                      ),
                      onPressed: () => setState(() => _obscurePassword = !_obscurePassword),
                    ),
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                      borderSide: BorderSide(color: AppColors.borderOf(context)),
                    ),
                    enabledBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                      borderSide: BorderSide(color: AppColors.borderOf(context)),
                    ),
                    focusedBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                      borderSide: const BorderSide(color: _orange, width: 2),
                    ),
                    filled: true,
                    fillColor: AppColors.cardOf(context),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return '请输入密码';
                    }
                    return null;
                  },
                ),

                const SizedBox(height: 32),

                // 登录按钮
                SizedBox(
                  height: 52,
                  child: ElevatedButton(
                    onPressed: userState.isLoading ? null : _login,
                    style: ElevatedButton.styleFrom(
                      backgroundColor: _orange,
                      disabledBackgroundColor: _orange.withOpacity(0.5),
                      elevation: 0,
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(12),
                      ),
                    ),
                    child: userState.isLoading
                        ? const SizedBox(
                            width: 24,
                            height: 24,
                            child: CircularProgressIndicator(
                              strokeWidth: 2,
                              color: Colors.white,
                            ),
                          )
                        : const Text(
                            '登录',
                            style: TextStyle(
                              fontSize: 18,
                              fontWeight: FontWeight.bold,
                              color: Colors.white,
                            ),
                          ),
                  ),
                ),

                const SizedBox(height: 16),

                // 忘记密码
                Align(
                  alignment: Alignment.centerRight,
                  child: TextButton(
                    onPressed: () => context.push(Routes.forgotPassword, extra: _phoneController.text.trim()),
                    child: Text(
                      '忘记密码？',
                      style: TextStyle(color: AppColors.textSecondaryOf(context)),
                    ),
                  ),
                ),

                // 注册入口已隐藏
              ],
            ),
          ),
        ),
      ),
    );
  }
}