import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:shadcn_ui/shadcn_ui.dart';
import '../../core/app_colors.dart';
import '../../core/app_theme.dart';
import '../../core/navigation_provider.dart';
import '../../providers/auth_provider.dart';
import '../../providers/data_providers.dart';

class LoginPage extends ConsumerStatefulWidget {
  const LoginPage({super.key});
  @override ConsumerState<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends ConsumerState<LoginPage> {
  final _phoneCtrl = TextEditingController();
  final _codeCtrl = TextEditingController();
  bool _agreed = false;
  bool _sending = false;
  int _countdown = 0;
  bool _loading = false;
  String? _error;

  @override void dispose() { _phoneCtrl.dispose(); _codeCtrl.dispose(); super.dispose(); }

  Future<void> _sendSms() async {
    final phone = _phoneCtrl.text.trim();
    if (phone.length != 11 || !phone.startsWith('1')) { setState(() => _error = '请输入正确的手机号'); return; }
    setState(() { _sending = true; _error = null; });
    final result = await ref.read(authProvider.notifier).sendSms(phone);
    setState(() { _sending = false; });
    if (result.error != null) { setState(() => _error = result.error); return; }
    if (result.devCode != null) _codeCtrl.text = result.devCode!;
    setState(() => _countdown = 60); _startCountdown();
  }

  void _startCountdown() async {
    for (var i = 60; i > 0; i--) {
      await Future.delayed(const Duration(seconds: 1));
      if (!mounted) return;
      setState(() => _countdown = i - 1);
    }
  }

  Future<void> _login() async {
    if (!_agreed) { setState(() => _error = '请阅读并同意服务协议和隐私政策'); return; }
    setState(() { _loading = true; _error = null; });
    final err = await ref.read(authProvider.notifier).login(_phoneCtrl.text.trim(), _codeCtrl.text.trim());
    setState(() => _loading = false);
    if (err != null) { setState(() => _error = err); return; }
    ref.invalidate(latestHealthProvider);
    ref.invalidate(medicationListProvider);
    ref.invalidate(medicationReminderProvider);
    ref.invalidate(currentExercisePlanProvider);
    goRoute(ref, 'home');
  }

  @override Widget build(BuildContext context) {
    final authState = ref.watch(authProvider);
    if (authState.isLoggedIn && !authState.isLoading) {
      WidgetsBinding.instance.addPostFrameCallback((_) => goRoute(ref, 'home'));
    }

    return Scaffold(
      body: Container(
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            colors: [Color(0xFFEEF2FF), Color(0xFFF5F3FF)],
          ),
        ),
        child: SafeArea(child: Center(child: SingleChildScrollView(
          padding: const EdgeInsets.symmetric(horizontal: 32),
          child: Column(mainAxisSize: MainAxisSize.min, children: [
            const SizedBox(height: 40),
            // Logo
            Container(
              width: 88, height: 88,
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(44),
                boxShadow: [BoxShadow(color: AppColors.primary.withOpacity(0.15), blurRadius: 20, offset: const Offset(0, 8))],
              ),
              child: const Icon(LucideIcons.heart, size: 40, color: AppColors.primary),
            ),
            const SizedBox(height: 20),
            const Text('健康管家', style: TextStyle(fontSize: 28, fontWeight: FontWeight.w700, color: AppColors.textPrimary)),
            const SizedBox(height: 6),
            const Text('你的 AI 心脏健康管家', style: TextStyle(fontSize: 15, color: AppColors.textSecondary)),
            const SizedBox(height: 40),

            // 手机号
            Container(
              decoration: BoxDecoration(
                gradient: AppColors.primaryGradient,
                borderRadius: BorderRadius.circular(10),
              ),
              padding: const EdgeInsets.all(1.5),
              child: Container(
                height: 52,
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.circular(9),
                ),
                child: Row(children: [
                  const Padding(padding: EdgeInsets.only(left: 16), child: Text('+86', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w500, color: AppColors.textPrimary))),
                  Container(width: 1, height: 24, color: AppColors.border, margin: const EdgeInsets.symmetric(horizontal: 12)),
                  Expanded(
                    child: TextField(
                      controller: _phoneCtrl,
                      keyboardType: TextInputType.phone,
                      maxLength: 11,
                      style: const TextStyle(fontSize: 16, color: AppColors.textPrimary),
                      decoration: const InputDecoration(
                        filled: false,
                        hintText: '请输入手机号',
                        hintStyle: TextStyle(fontSize: 15, color: AppColors.textHint),
                        border: InputBorder.none,
                        enabledBorder: InputBorder.none,
                        focusedBorder: InputBorder.none,
                        counterText: '',
                        contentPadding: EdgeInsets.symmetric(vertical: 14),
                      ),
                    ),
                  ),
                ]),
              ),
            ),
            const SizedBox(height: 16),

            // 验证码
            Row(children: [
              Expanded(
                child: Container(
                  decoration: BoxDecoration(
                    gradient: AppColors.primaryGradient,
                    borderRadius: BorderRadius.circular(10),
                  ),
                  padding: const EdgeInsets.all(1.5),
                  child: Container(
                    height: 52,
                    decoration: BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.circular(9),
                    ),
                    child: TextField(
                      controller: _codeCtrl,
                      keyboardType: TextInputType.number,
                      maxLength: 6,
                      style: const TextStyle(fontSize: 16, color: AppColors.textPrimary),
                      decoration: const InputDecoration(
                        filled: false,
                        hintText: '验证码',
                        hintStyle: TextStyle(fontSize: 15, color: AppColors.textHint),
                        border: InputBorder.none,
                        enabledBorder: InputBorder.none,
                        focusedBorder: InputBorder.none,
                        counterText: '',
                        contentPadding: EdgeInsets.symmetric(horizontal: 16, vertical: 14),
                      ),
                    ),
                  ),
                ),
              ),
              const SizedBox(width: 12),
              GestureDetector(
                onTap: (_countdown > 0 || _sending) ? null : _sendSms,
                child: Container(
                  width: 120, height: 52,
                  alignment: Alignment.center,
                  decoration: BoxDecoration(
                    color: (_countdown > 0 || _sending) ? Colors.white : AppColors.primary,
                    borderRadius: BorderRadius.circular(10),
                  ),
                  child: Text(
                    _sending ? '发送中' : _countdown > 0 ? '${_countdown}s' : '获取验证码',
                    style: TextStyle(fontSize: 15, fontWeight: FontWeight.w500,
                      color: (_countdown > 0 || _sending) ? AppColors.textHint : Colors.white),
                  ),
                ),
              ),
            ]),
            const SizedBox(height: 12),

            // 协议
            GestureDetector(
              onTap: () => setState(() => _agreed = !_agreed),
              child: Row(mainAxisSize: MainAxisSize.min, children: [
                Container(
                  width: 18, height: 18, margin: const EdgeInsets.only(right: 6),
                  decoration: BoxDecoration(
                    color: _agreed ? AppColors.primary : Colors.white,
                    borderRadius: BorderRadius.circular(4),
                    border: Border.all(color: _agreed ? AppColors.primary : AppColors.border, width: 1.5),
                  ),
                  child: _agreed ? const Icon(Icons.check, size: 14, color: Colors.white) : null,
                ),
                RichText(text: TextSpan(children: [
                  TextSpan(text: '已阅读并同意', style: TextStyle(fontSize: 13, color: AppColors.textHint)),
                  TextSpan(text: '《服务协议》', style: TextStyle(fontSize: 13, color: AppColors.primary)),
                  TextSpan(text: '和', style: TextStyle(fontSize: 13, color: AppColors.textHint)),
                  TextSpan(text: '《隐私政策》', style: TextStyle(fontSize: 13, color: AppColors.primary)),
                ])),
              ]),
            ),

            if (_error != null)
              Padding(padding: const EdgeInsets.only(top: 12), child: Text(_error!, style: const TextStyle(color: AppColors.error, fontSize: 14))),

            const SizedBox(height: 32),

            // 登录按钮
            GestureDetector(
              onTap: _loading ? null : _login,
              child: Container(
                width: double.infinity, height: 52, alignment: Alignment.center,
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.circular(12),
                  border: Border.all(color: AppColors.primary, width: 1.5),
                ),
                child: _loading
                    ? const SizedBox(width: 24, height: 24, child: CircularProgressIndicator(strokeWidth: 2.5, color: AppColors.primary))
                    : const Text('登 录', style: TextStyle(fontSize: 18, color: AppColors.primary, fontWeight: FontWeight.w600, letterSpacing: 2)),
              ),
            ),

            const SizedBox(height: 40),
          ]),
        ))),
      ),
    );
  }
}