import 'dart:async';

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/storage/local_store.dart';
import '../../core/theme/app_theme.dart';
import '../../providers/auth_provider.dart';
import '../../services/auth_service.dart';

/// 注册页：手机号 + 验证码 + 密码；邀请码选填（口令/模糊归因命中时自动预填）
class RegisterScreen extends ConsumerStatefulWidget {
  const RegisterScreen({super.key});

  @override
  ConsumerState<RegisterScreen> createState() => _RegisterScreenState();
}

class _RegisterScreenState extends ConsumerState<RegisterScreen> {
  final _phone = TextEditingController();
  final _code = TextEditingController();
  final _password = TextEditingController();
  final _nickname = TextEditingController();
  late final TextEditingController _inviteCode;
  bool _loading = false;
  String? _error;

  /// 验证码发送倒计时
  int _countdown = 0;
  Timer? _timer;

  @override
  void initState() {
    super.initState();
    // 首启归因命中的邀请码预填（用户可改可清空）
    _inviteCode = TextEditingController(text: LocalStore.I.pendingInviteCode ?? '');
  }

  @override
  void dispose() {
    _timer?.cancel();
    _phone.dispose();
    _code.dispose();
    _password.dispose();
    _nickname.dispose();
    _inviteCode.dispose();
    super.dispose();
  }

  Future<void> _sendCode() async {
    final phone = _phone.text.trim();
    if (!RegExp(r'^1\d{10}$').hasMatch(phone)) {
      setState(() => _error = '请输入正确的手机号');
      return;
    }
    try {
      final devCode = await AuthService.sendSmsCode(phone, 'register');
      setState(() {
        _error = null;
        _countdown = 60;
      });
      if (devCode != null && mounted) {
        // 短信通道未配置时的开发模式：直接展示验证码（上线配置短信后服务端不再返回）
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('开发模式验证码：$devCode（5 分钟内有效）'), duration: const Duration(seconds: 6)),
        );
      }
      _timer?.cancel();
      _timer = Timer.periodic(const Duration(seconds: 1), (t) {
        if (_countdown <= 1) {
          t.cancel();
          setState(() => _countdown = 0);
        } else {
          setState(() => _countdown -= 1);
        }
      });
    } on ApiException catch (e) {
      setState(() => _error = e.message);
    } catch (_) {
      setState(() => _error = '网络异常，请稍后重试');
    }
  }

  Future<void> _submit() async {
    final phone = _phone.text.trim();
    final code = _code.text.trim();
    final password = _password.text;
    if (phone.isEmpty || code.isEmpty || password.isEmpty) {
      setState(() => _error = '请填写手机号、验证码和密码');
      return;
    }
    setState(() {
      _loading = true;
      _error = null;
    });
    try {
      final result = await AuthService.register(
        type: 'phone',
        account: phone,
        code: code,
        password: password,
        nickname: _nickname.text.trim(),
        inviteCode: _inviteCode.text.trim().toUpperCase(),
      );
      // 注册成功：pending 邀请码已被消费，清除本地标记
      await LocalStore.I.clearPendingInviteCode();
      await ref.read(authProvider.notifier).onLoginSuccess(result.user);
      if (!mounted) return;
      if (result.trialPlanName != null) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('注册成功，已赠送${result.trialPlanName}')),
        );
      }
      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('注册')),
      body: SafeArea(
        child: ListView(
          padding: const EdgeInsets.all(24),
          children: [
            const Text('创建账号', style: TextStyle(fontSize: 26, fontWeight: FontWeight.w700)),
            const SizedBox(height: 32),
            TextField(
              controller: _phone,
              keyboardType: TextInputType.phone,
              decoration: const InputDecoration(hintText: '手机号'),
            ),
            const SizedBox(height: 16),
            Row(
              children: [
                Expanded(
                  child: TextField(
                    controller: _code,
                    keyboardType: TextInputType.number,
                    decoration: const InputDecoration(hintText: '短信验证码'),
                  ),
                ),
                const SizedBox(width: 12),
                SizedBox(
                  width: 120,
                  child: OutlinedButton(
                    onPressed: _countdown > 0 ? null : _sendCode,
                    child: Text(_countdown > 0 ? '${_countdown}s 后重发' : '获取验证码'),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),
            TextField(
              controller: _password,
              obscureText: true,
              decoration: const InputDecoration(hintText: '密码（8-32 位，含字母和数字）'),
            ),
            const SizedBox(height: 16),
            TextField(
              controller: _nickname,
              decoration: const InputDecoration(hintText: '昵称（选填）'),
            ),
            const SizedBox(height: 16),
            TextField(
              controller: _inviteCode,
              textCapitalization: TextCapitalization.characters,
              decoration: const InputDecoration(hintText: '邀请码（选填）'),
            ),
            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('注册并登录'),
            ),
            const SizedBox(height: 16),
            TextButton(
              onPressed: () => context.pop(),
              child: const Text('已有账号？去登录', style: TextStyle(color: AppColors.textSecondary)),
            ),
          ],
        ),
      ),
    );
  }
}