import 'package:flutter/material.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import '../../../../routes/route_paths.dart';
import '../../../../routes/app_router.dart';
import '../../../../core/di/injection_container.dart';

/// 创建账号页面 - 用户首次进入应用时的引导页面
/// 提供创建钱包和导入助记词两种选项
class OnboardingPage extends ConsumerStatefulWidget {
  const OnboardingPage({super.key});

  @override
  ConsumerState<OnboardingPage> createState() => _OnboardingPageState();
}

class _OnboardingPageState extends ConsumerState<OnboardingPage> {
  // 用户协议勾选状态
  bool _isAgreed = false;
  // 创建钱包加载状态
  bool _isCreating = false;
  // 钱包是否已创建
  bool _isWalletCreated = false;
  // 是否正在加载状态
  bool _isLoading = true;
  // 已创建的钱包数据
  String? _mnemonic;
  String? _kavaAddress;
  String? _dstAddress;
  String? _bscAddress;
  String? _serialNumber;
  String? _referralCode;

  @override
  void initState() {
    super.initState();
    _checkWalletStatus();
  }

  /// 检查钱包是否已创建
  Future<void> _checkWalletStatus() async {
    try {
      final accountService = ref.read(accountServiceProvider);

      // 检查是否已创建钱包
      final hasAccount = await accountService.hasAccount();

      if (hasAccount) {
        // 读取已保存的钱包数据
        final mnemonic = await accountService.getMnemonic();
        final addresses = await accountService.getWalletAddresses();
        final sequence = await accountService.getAccountSequence();
        final referralCode = await accountService.getReferralCode();

        if (mounted) {
          setState(() {
            _isWalletCreated = true;
            _mnemonic = mnemonic;
            _kavaAddress = addresses?.kava;
            _dstAddress = addresses?.dst;
            _bscAddress = addresses?.bsc;
            _serialNumber = sequence?.toString();
            _referralCode = referralCode;
            _isLoading = false;
            // 如果钱包已创建，自动勾选协议
            _isAgreed = true;
          });
        }
      } else {
        if (mounted) {
          setState(() {
            _isWalletCreated = false;
            _isLoading = false;
          });
        }
      }
    } catch (e) {
      debugPrint('检查钱包状态失败: $e');
      if (mounted) {
        setState(() {
          _isWalletCreated = false;
          _isLoading = false;
        });
      }
    }
  }

  /// 创建钱包并跳转到备份页面
  ///
  /// 调用后端 API 使用 MPC 2-of-3 协议生成钱包地址
  Future<void> _createWallet() async {
    if (!_isAgreed) {
      _showAgreementTip();
      return;
    }

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

    try {
      // 获取 AccountService
      final accountService = ref.read(accountServiceProvider);

      // 调用后端 API 创建账号
      debugPrint('开始创建账号...');
      final response = await accountService.createAccount();
      debugPrint('账号创建成功: 序列号=${response.accountSequence}');

      if (!mounted) return;

      // MPC 模式下，检查是否有客户端分片数据
      // 如果有分片数据，需要提示用户妥善保管
      final hasMpcData = response.clientShareData != null &&
          response.clientShareData!.isNotEmpty;

      // 跳转到钱包创建成功页面
      context.push(
        RoutePaths.backupMnemonic,
        extra: BackupMnemonicParams(
          // MPC 模式下助记词为空，显示账号信息即可
          mnemonicWords: response.mnemonic?.isNotEmpty == true
              ? response.mnemonic!.split(' ')
              : [], // MPC 模式下为空
          kavaAddress: response.walletAddresses.kava,
          dstAddress: response.walletAddresses.dst,
          bscAddress: response.walletAddresses.bsc,
          serialNumber: response.accountSequence.toString(),
          referralCode: response.referralCode,
          publicKey: response.publicKey,
          isMpcMode: hasMpcData, // 标记是否为 MPC 模式
        ),
      );
    } catch (e) {
      debugPrint('创建账号失败: $e');
      if (!mounted) return;

      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('创建账号失败: ${e.toString().replaceAll('Exception: ', '')}'),
          backgroundColor: Colors.red,
          duration: const Duration(seconds: 5),
        ),
      );
    } finally {
      if (mounted) {
        setState(() => _isCreating = false);
      }
    }
  }

  /// 显示需要同意协议的提示
  void _showAgreementTip() {
    ScaffoldMessenger.of(context).showSnackBar(
      const SnackBar(
        content: Text('请先阅读并同意用户协议和隐私政策'),
        backgroundColor: Color(0xFFD4AF37),
      ),
    );
  }

  /// 显示用户协议
  void _showUserAgreement() {
    // TODO: 跳转到用户协议页面
    debugPrint('显示用户协议');
  }

  /// 显示隐私政策
  void _showPrivacyPolicy() {
    // TODO: 跳转到隐私政策页面
    debugPrint('显示隐私政策');
  }

  /// 导入助记词
  void _importMnemonic() {
    // TODO: 跳转到导入助记词页面
    debugPrint('导入助记词');
  }

  /// 跳转到备份助记词页面（钱包已创建的情况）
  void _goToBackupMnemonic() {
    if (_mnemonic == null || _kavaAddress == null || _dstAddress == null ||
        _bscAddress == null || _serialNumber == null) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text('钱包数据不完整，请重新创建'),
          backgroundColor: Colors.red,
        ),
      );
      return;
    }

    context.push(
      RoutePaths.backupMnemonic,
      extra: BackupMnemonicParams(
        mnemonicWords: _mnemonic!.split(' '),
        kavaAddress: _kavaAddress!,
        dstAddress: _dstAddress!,
        bscAddress: _bscAddress!,
        serialNumber: _serialNumber!,
        referralCode: _referralCode,
        isMpcMode: false,
      ),
    );
  }

  /// 处理按钮点击
  void _handleButtonTap() {
    if (_isWalletCreated) {
      // 钱包已创建，跳转到备份页面
      _goToBackupMnemonic();
    } else {
      // 钱包未创建，创建新钱包
      _createWallet();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        width: double.infinity,
        height: double.infinity,
        // 渐变背景 - 从浅米色到金黄色
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            colors: [
              Color(0xFFFFF5E6), // 浅米色
              Color(0xFFFFE4B5), // 金黄色
            ],
          ),
        ),
        child: SafeArea(
          child: Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 15),
            child: Column(
              children: [
                // 顶部 Logo 和标题区域
                _buildHeader(),
                const SizedBox(height: 48),
                // 创建账户说明区域
                _buildDescription(),
                const Spacer(),
                // 底部操作区域
                _buildActionSection(),
                const SizedBox(height: 9),
              ],
            ),
          ),
        ),
      ),
    );
  }

  /// 构建顶部 Logo 和标题
  Widget _buildHeader() {
    return Column(
      children: [
        const SizedBox(height: 32),
        // Logo 容器
        Container(
          width: 100,
          height: 80,
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(8),
            boxShadow: [
              BoxShadow(
                color: Colors.black.withValues(alpha: 0.05),
                blurRadius: 10,
                offset: const Offset(0, 2),
              ),
            ],
          ),
          child: const Center(
            child: Text(
              'ap',
              style: TextStyle(
                fontSize: 32,
                fontWeight: FontWeight.w600,
                color: Color(0xFF2E7D32), // 绿色
              ),
            ),
          ),
        ),
        const SizedBox(height: 24),
        // 应用标题
        const Text(
          '榴莲女皇',
          style: TextStyle(
            fontSize: 32,
            fontFamily: 'Inter',
            fontWeight: FontWeight.w700,
            height: 1.25,
            color: Color(0xFF5D4037), // 深棕色
          ),
        ),
      ],
    );
  }

  /// 构建创建账户说明区域
  Widget _buildDescription() {
    return Column(
      children: [
        // 标题
        const Text(
          '创建账户',
          style: TextStyle(
            fontSize: 22,
            fontFamily: 'Inter',
            fontWeight: FontWeight.w700,
            height: 1.25,
            letterSpacing: -0.33,
            color: Color(0xFF5D4037),
          ),
        ),
        const SizedBox(height: 16),
        // 说明文字
        const Padding(
          padding: EdgeInsets.symmetric(horizontal: 20),
          child: Text(
            '我们将为你创建三个链的钱包地址：KAVA / DST / BSC，同时生成唯一序列号用于推荐与权益。',
            style: TextStyle(
              fontSize: 16,
              fontFamily: 'Inter',
              height: 1.5,
              color: Color(0xFF5D4037),
            ),
            textAlign: TextAlign.center,
          ),
        ),
      ],
    );
  }

  /// 构建底部操作区域
  Widget _buildActionSection() {
    return Column(
      children: [
        // 生成钱包按钮
        _buildCreateButton(),
        const SizedBox(height: 20),
        // 用户协议勾选
        _buildAgreementCheckbox(),
        const SizedBox(height: 24),
        // 导入助记词链接
        _buildImportLink(),
      ],
    );
  }

  /// 构建创建钱包按钮
  Widget _buildCreateButton() {
    // 加载中显示骨架
    if (_isLoading) {
      return Container(
        width: double.infinity,
        height: 48,
        decoration: BoxDecoration(
          color: const Color(0xFFD4AF37).withValues(alpha: 0.5),
          borderRadius: BorderRadius.circular(8),
        ),
        child: const Center(
          child: SizedBox(
            width: 24,
            height: 24,
            child: CircularProgressIndicator(
              strokeWidth: 2,
              valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
            ),
          ),
        ),
      );
    }

    // 根据钱包状态决定按钮文字和行为
    final buttonText = _isWalletCreated
        ? '钱包已创建（点击备份助记词）'
        : '生成钱包（创建账户）';

    // 钱包已创建时，不需要勾选协议
    final isEnabled = _isWalletCreated || _isAgreed;

    return GestureDetector(
      onTap: (_isCreating || !isEnabled) ? null : _handleButtonTap,
      child: Opacity(
        opacity: isEnabled ? 1.0 : 0.5,
        child: Container(
          width: double.infinity,
          height: 48,
          decoration: BoxDecoration(
            color: _isWalletCreated
                ? const Color(0xFF52C41A) // 绿色表示已创建
                : const Color(0xFFD4AF37), // 金色表示待创建
            borderRadius: BorderRadius.circular(8),
          ),
          child: Center(
            child: _isCreating
                ? const SizedBox(
                    width: 24,
                    height: 24,
                    child: CircularProgressIndicator(
                      strokeWidth: 2,
                      valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
                    ),
                  )
                : Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      if (_isWalletCreated) ...[
                        const Icon(
                          Icons.check_circle,
                          color: Colors.white,
                          size: 20,
                        ),
                        const SizedBox(width: 8),
                      ],
                      Text(
                        buttonText,
                        style: const TextStyle(
                          fontSize: 16,
                          fontFamily: 'Inter',
                          fontWeight: FontWeight.w700,
                          height: 1.5,
                          letterSpacing: 0.24,
                          color: Colors.white,
                        ),
                      ),
                    ],
                  ),
          ),
        ),
      ),
    );
  }

  /// 构建用户协议勾选框
  Widget _buildAgreementCheckbox() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        // 勾选框
        SizedBox(
          width: 20,
          height: 20,
          child: Checkbox(
            value: _isAgreed,
            onChanged: (value) {
              setState(() {
                _isAgreed = value ?? false;
              });
            },
            activeColor: const Color(0xFFD4AF37),
            side: const BorderSide(color: Color(0xFF5D4037)),
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(4),
            ),
          ),
        ),
        const SizedBox(width: 8),
        // 协议文字
        Flexible(
          child: RichText(
            text: TextSpan(
              style: const TextStyle(
                fontSize: 14,
                fontFamily: 'Inter',
                fontWeight: FontWeight.w500,
                height: 1.43,
                color: Color(0xFF5D4037),
              ),
              children: [
                const TextSpan(text: '我已阅读并同意 '),
                TextSpan(
                  text: '《用户协议》',
                  style: const TextStyle(color: Color(0xFFD4AF37)),
                  recognizer: TapGestureRecognizer()..onTap = _showUserAgreement,
                ),
                TextSpan(
                  text: '《隐私政策》',
                  style: const TextStyle(color: Color(0xFFD4AF37)),
                  recognizer: TapGestureRecognizer()..onTap = _showPrivacyPolicy,
                ),
              ],
            ),
          ),
        ),
      ],
    );
  }

  /// 构建导入助记词链接
  Widget _buildImportLink() {
    return GestureDetector(
      onTap: _importMnemonic,
      child: const Text(
        '已有账号？ 导入助记词',
        style: TextStyle(
          fontSize: 14,
          fontFamily: 'Inter',
          fontWeight: FontWeight.w500,
          height: 1.43,
          color: Color(0xFFD4AF37),
        ),
      ),
    );
  }
}