import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:qr_flutter/qr_flutter.dart';
import '../../../../core/di/injection_container.dart';

/// 分享页面 - 显示邀请链接和二维码
/// 进入页面时自动调用 API 生成短链，显示二维码
class SharePage extends ConsumerStatefulWidget {
  /// 初始分享链接 (fallback)
  final String shareLink;
  /// 邀请码
  final String? referralCode;

  const SharePage({
    super.key,
    required this.shareLink,
    this.referralCode,
  });

  @override
  ConsumerState<SharePage> createState() => _SharePageState();
}

class _SharePageState extends ConsumerState<SharePage> {
  /// 实际显示的分享链接 (API 返回的短链)
  late String _displayLink;
  /// 是否正在加载
  bool _isLoading = true;
  /// 错误信息
  String? _errorMessage;
  /// 推荐码（从 API 获取后保存）
  String? _referralCode;

  @override
  void initState() {
    super.initState();
    _displayLink = widget.shareLink; // 默认使用传入的链接
    _loadShareLink();
  }

  /// APK 下载基础链接
  static const String _apkDownloadUrl = 'https://s3.szaiai.com/rwadurian/app-release.apk';

  /// 加载分享链接 (使用 APK 下载链接 + 推荐码)
  Future<void> _loadShareLink() async {
    try {
      setState(() {
        _isLoading = true;
        _errorMessage = null;
      });

      final referralService = ref.read(referralServiceProvider);

      // 调用 API 获取推荐码
      final linkResponse = await referralService.generateReferralLink();

      if (mounted) {
        setState(() {
          // 使用 APK 下载链接 + 推荐码参数
          _referralCode = linkResponse.referralCode;
          _displayLink = '$_apkDownloadUrl?ref=$_referralCode';
          _isLoading = false;
        });
      }
    } catch (e) {
      debugPrint('加载分享链接失败: $e');
      if (mounted) {
        setState(() {
          _isLoading = false;
          // 失败时使用传入的推荐码构造链接
          if (widget.referralCode != null && widget.referralCode!.isNotEmpty) {
            _referralCode = widget.referralCode;
            _displayLink = '$_apkDownloadUrl?ref=${widget.referralCode}';
          } else {
            _displayLink = _apkDownloadUrl;
          }
          _errorMessage = '加载失败，使用默认链接';
        });
      }
    }
  }

  /// 复制链接到剪贴板
  void _copyLink() {
    Clipboard.setData(ClipboardData(text: _displayLink));
    ScaffoldMessenger.of(context).showSnackBar(
      const SnackBar(
        content: Text('链接已复制'),
        backgroundColor: Color(0xFFD4A84B),
        duration: Duration(seconds: 2),
      ),
    );
  }

  /// 返回上一页
  void _goBack() {
    context.pop();
  }

  /// 确认按钮点击
  void _onConfirm() {
    context.pop();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        width: double.infinity,
        height: double.infinity,
        // 渐变背景 - 从浅黄到白色
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            colors: [
              Color(0xFFFFF7E6), // 浅黄色顶部
              Color(0xFFFFFDF8), // 接近白色底部
            ],
          ),
        ),
        child: SafeArea(
          child: Column(
            children: [
              // 顶部导航栏
              _buildAppBar(),
              // 内容区域
              Expanded(
                child: Center(
                  child: SingleChildScrollView(
                    child: Padding(
                      padding: const EdgeInsets.symmetric(vertical: 24),
                      child: Column(
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          // QR 码区域
                          _buildQrCodeSection(),
                          const SizedBox(height: 32),
                          // 链接输入框
                          _buildLinkSection(),
                        ],
                      ),
                    ),
                  ),
                ),
              ),
              // 底部确认按钮
              _buildFooter(),
            ],
          ),
        ),
      ),
    );
  }

  /// 构建顶部导航栏
  Widget _buildAppBar() {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
      child: Row(
        children: [
          // 返回按钮
          GestureDetector(
            onTap: _goBack,
            child: Container(
              width: 28,
              height: 28,
              alignment: Alignment.center,
              child: const Icon(
                Icons.arrow_back_ios,
                color: Color(0xFF8C6A3E),
                size: 20,
              ),
            ),
          ),
          const SizedBox(width: 8),
          // 标题
          const Expanded(
            child: Text(
              '分享页面',
              style: TextStyle(
                fontSize: 18,
                fontFamily: 'Segoe UI',
                fontWeight: FontWeight.w600,
                height: 1.56,
                color: Color(0xFF8C6A3E),
              ),
            ),
          ),
        ],
      ),
    );
  }

  /// 构建 QR 码区域
  Widget _buildQrCodeSection() {
    return Column(
      children: [
        Container(
          width: 256,
          height: 256,
          decoration: BoxDecoration(
            color: const Color(0xFFFAF3E3),
            borderRadius: BorderRadius.circular(24),
            boxShadow: const [
              BoxShadow(
                color: Color(0x1A8C6A3E), // rgba(140, 106, 62, 0.1)
                blurRadius: 30,
                offset: Offset(0, 8),
              ),
            ],
          ),
          child: Center(
            child: _isLoading
                ? const CircularProgressIndicator(
                    color: Color(0xFFD4A84B),
                    strokeWidth: 2,
                  )
                : QrImageView(
                    data: _displayLink,
                    version: QrVersions.auto,
                    size: 200,
                    backgroundColor: Colors.transparent,
                    eyeStyle: const QrEyeStyle(
                      eyeShape: QrEyeShape.square,
                      color: Color(0xFF8C6A3E),
                    ),
                    dataModuleStyle: const QrDataModuleStyle(
                      dataModuleShape: QrDataModuleShape.square,
                      color: Color(0xFF8C6A3E),
                    ),
                  ),
          ),
        ),
        // 推荐码显示
        if (_referralCode != null && _referralCode!.isNotEmpty) ...[
          const SizedBox(height: 16),
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
            decoration: BoxDecoration(
              color: const Color(0xFFF8F1E2),
              borderRadius: BorderRadius.circular(20),
            ),
            child: Row(
              mainAxisSize: MainAxisSize.min,
              children: [
                const Text(
                  '我的推荐码：',
                  style: TextStyle(
                    fontSize: 14,
                    fontFamily: 'Segoe UI',
                    color: Color(0xFF8C6A3E),
                  ),
                ),
                Text(
                  _referralCode!,
                  style: const TextStyle(
                    fontSize: 16,
                    fontFamily: 'Segoe UI',
                    fontWeight: FontWeight.w700,
                    color: Color(0xFFD4A84B),
                    letterSpacing: 1,
                  ),
                ),
                const SizedBox(width: 8),
                GestureDetector(
                  onTap: _copyReferralCode,
                  child: const Icon(
                    Icons.copy_outlined,
                    color: Color(0xFF8C6A3E),
                    size: 18,
                  ),
                ),
              ],
            ),
          ),
        ],
      ],
    );
  }

  /// 复制推荐码
  void _copyReferralCode() {
    if (_referralCode != null && _referralCode!.isNotEmpty) {
      Clipboard.setData(ClipboardData(text: _referralCode!));
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text('推荐码已复制'),
          backgroundColor: Color(0xFFD4A84B),
          duration: Duration(seconds: 2),
        ),
      );
    }
  }

  /// 构建链接显示区域
  Widget _buildLinkSection() {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 32),
      child: Column(
        children: [
          Container(
            width: double.infinity,
            constraints: const BoxConstraints(maxWidth: 296),
            padding: const EdgeInsets.fromLTRB(16, 8, 12, 8),
            decoration: BoxDecoration(
              color: const Color(0xFFF8F1E2),
              borderRadius: BorderRadius.circular(9999), // 胶囊形状
            ),
            child: Row(
              children: [
                // 链接文本
                Expanded(
                  child: _isLoading
                      ? const Text(
                          '加载中...',
                          style: TextStyle(
                            fontSize: 13.7,
                            fontFamily: 'Segoe UI',
                            height: 1.5,
                            color: Color(0xFFB0A090),
                          ),
                        )
                      : Text(
                          _displayLink,
                          style: const TextStyle(
                            fontSize: 13.7,
                            fontFamily: 'Segoe UI',
                            height: 1.5,
                            color: Color(0xFF8C6A3E),
                          ),
                          overflow: TextOverflow.ellipsis,
                        ),
                ),
                const SizedBox(width: 8),
                // 复制按钮
                GestureDetector(
                  onTap: _isLoading ? null : _copyLink,
                  child: Container(
                    width: 32,
                    height: 32,
                    decoration: BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.circular(9999),
                      boxShadow: const [
                        BoxShadow(
                          color: Color(0x0D000000), // rgba(0, 0, 0, 0.05)
                          blurRadius: 2,
                          offset: Offset(0, 1),
                        ),
                      ],
                    ),
                    child: Center(
                      child: Icon(
                        Icons.copy_outlined,
                        color: _isLoading
                            ? const Color(0xFFB0A090)
                            : const Color(0xFF8C6A3E),
                        size: 18,
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
          // 错误提示
          if (_errorMessage != null) ...[
            const SizedBox(height: 8),
            Text(
              _errorMessage!,
              style: const TextStyle(
                fontSize: 12,
                color: Color(0xFFB0A090),
              ),
            ),
          ],
        ],
      ),
    );
  }

  /// 构建底部确认按钮
  Widget _buildFooter() {
    return Container(
      padding: const EdgeInsets.all(24),
      child: GestureDetector(
        onTap: _onConfirm,
        child: Container(
          width: double.infinity,
          height: 60,
          decoration: BoxDecoration(
            color: const Color(0xFFD1A45B),
            borderRadius: BorderRadius.circular(12),
            boxShadow: const [
              BoxShadow(
                color: Color(0x4DD1A45B), // rgba(209, 164, 91, 0.3)
                blurRadius: 15,
                offset: Offset(0, 10),
              ),
              BoxShadow(
                color: Color(0x4DD1A45B), // rgba(209, 164, 91, 0.3)
                blurRadius: 6,
                offset: Offset(0, 4),
              ),
            ],
          ),
          child: const Center(
            child: Text(
              '确认',
              style: TextStyle(
                fontSize: 18,
                fontFamily: 'Segoe UI',
                fontWeight: FontWeight.w700,
                height: 1.56,
                color: Colors.white,
              ),
            ),
          ),
        ),
      ),
    );
  }
}