import 'dart:async';

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:go_router/go_router.dart';
import 'package:news_app/widget/my_txt.dart';
import 'package:flutter_swiper_view/flutter_swiper_view.dart';

import '../../constant/api_const.dart';
import '../../constant/color_res.dart';
import '../../gen/assets.gen.dart';
import '../../http/http_util.dart';
import '../../util/log.util.dart';
import '../../util/shared_prefs_instance_util.dart';
import '../../widget/load_image.dart';

/// @author: bo.zeng
/// @email: cnhbwds@gmail.com
/// @date: 2025 2025/4/9 16:00
/// @description:
class SplashPage extends StatefulWidget {
  const SplashPage({super.key});

  @override
  State<SplashPage> createState() => _SplashPageState();
}

class _SplashPageState extends State<SplashPage> with SingleTickerProviderStateMixin {
  TapGestureRecognizer? aa;
  List<String> _splashImages = [];
  int _currentIndex = 0;
  late Timer _sliderTimer;
  Timer? _navigateTimer;
  bool _hasStartedNavigation = false;

  // 本地默认开屏图片（当网络不可用时使用）
  static const List<String> _defaultSplashImages = [
    'assets/images/splash_bg.png', // 本地默认图片
  ];

  @override
  void initState() {
    super.initState();
    // 初始化使用本地默认图片
    _splashImages = _defaultSplashImages;
    // 启动轮播
    _startSlider();
    // 从后台获取开屏页配置
    _fetchSplashConfig();
  }

  /// 开始轮播
  void _startSlider() {
    _sliderTimer = Timer.periodic(const Duration(seconds: 3), (timer) {
      if (mounted && _splashImages.isNotEmpty) {
        setState(() {
          _currentIndex = (_currentIndex + 1) % _splashImages.length;
        });
      }
    });
  }

  /// 从后台获取开屏页配置
  Future<void> _fetchSplashConfig() async {
    try {
      final response = await HttpUtil().get(apiSplashConfig);
      if (response != null && response['code'] == 200) {
        final data = response['data'];
        if (data != null) {
          // 支持多种数据格式
          List<String> fetchedImages = [];

          // 格式1: imageUrl 为单个图片
          if (data['imageUrl'] != null && data['imageUrl'].toString().isNotEmpty) {
            fetchedImages.add(data['imageUrl']);
          }

          // 格式2: images 为图片数组
          if (data is List) {
            for (var img in data) {
              if (img.toString().isNotEmpty) {
                fetchedImages.add(img['url']);
              }
            }
          }

          // 格式3: imageList 为图片数组
          if (data['imageList'] is List) {
            final images = data['imageList'] as List;
            for (var img in images) {
              if (img.toString().isNotEmpty) {
                fetchedImages.add(img.toString());
              }
            }
          }

          // 如果获取到了图片，更新显示
          if (fetchedImages.isNotEmpty && mounted) {
            setState(() {
              _splashImages = fetchedImages;
              _currentIndex = 0;
            });
          }
        }
      }
    } catch (e) {
      // 请求失败或无网络权限，继续使用本地默认图片，不做任何处理
      consoleLog('Splash fetch error (will use default): $e');
    }

    // 延迟 3-5 秒后执行跳转逻辑
    _startNavigationTimer();
  }

  /// 启动导航计时器
  void _startNavigationTimer() {
    if (_hasStartedNavigation) return;
    _hasStartedNavigation = true;

    _navigateTimer = Timer(const Duration(seconds: 4), () async {
      bool? first = await getIsFirst();
      // 确保页面未被销毁
      if (!mounted) return;
      if (first == true) {
        context.go('/main');
      } else {
        _showFirstDialog(context);
      }
    });
  }

  @override
  void dispose() {
    _sliderTimer.cancel();
    _navigateTimer?.cancel();
    aa?.dispose();
    super.dispose();
  }

  void _showFirstDialog(BuildContext context) {
    aa = TapGestureRecognizer();
    aa?.onTap = () {
      context.push("/user/privacy");
    };
    showDialog(
      context: context,
      builder: (context) {
        return AlertDialog(
          content: SizedBox(
            height: 200.h,
            width: 220.w,
            child: SingleChildScrollView(
              child: Column(
                children: [
                  Text(
                    "个人信息保护提示",
                    style: TextStyle(fontSize: 14.sp, color: Colors.black),
                  ),
                  Text.rich(
                    TextSpan(
                      children: [
                        TextSpan(
                          text: "欢迎使用新消费传媒!我们将通过",
                          style: TextStyle(
                            fontSize: 12.sp,
                            color: Colors.black,
                          ),
                        ),
                        TextSpan(
                          text: "《用户协议》",
                          style: TextStyle(fontSize: 12.sp, color: Colors.blue),
                          recognizer: aa,
                          // recognizer: _tapRecognizer
                        ),
                        TextSpan(
                          text: "和",
                          style: TextStyle(
                            fontSize: 12.sp,
                            color: Colors.black,
                          ),
                        ),
                        TextSpan(
                          text: "《隐私政策》",
                          style: TextStyle(fontSize: 12.sp, color: Colors.blue),
                          recognizer: aa,
                        ),
                        TextSpan(
                          text:
                              "和帮助您了解我们为您提供的服务、"
                              "我们如何处理个人信息以及您享有的权利。我们会严格按照相关法律法规要求，采取各种安全措施来保护您的个人信息。\n"
                              "点击“同意”按钮，表示您已知情并同意以上协议和以下约定。\n"
                              "1.为了保障软件的安全运行和账户安全我们会申请收集您的设备信息、IP地址WLAN MAC地址。\n"
                              "2.上传或拍摄图片、视频，需要使用您的媒体影音、图片、视频、音频、相机、麦克风权限。\n"
                              "3.我们可能会申请位置权限，用于为您推荐您可能感兴趣的内容。\n"
                              "4.我们尊重您的选择权，您可以访问、修改、删除您的个人信息并管理您的授权，我们也为您提供注销、投诉渠道。",
                          style: TextStyle(
                            fontSize: 12.sp,
                            color: Colors.black,
                          ),
                        ),
                      ],
                    ),
                  ),
                ],
              ),
            ),
          ),
          actions: [
            GestureDetector(
              onTap: () {
                saveIsFirst();
                context.go('/main');
              },
              child: Container(
                alignment: Alignment.center,
                padding: EdgeInsets.symmetric(vertical: 6.h),
                decoration: BoxDecoration(
                  color: colorE71717,
                  borderRadius: BorderRadius.circular(10.r),
                ),
                child: myTxt(text: "同意", color: Colors.white, fontSize: 14.sp),
              ),
            ),
            GestureDetector(
              onTap: () {
                SystemNavigator.pop();
              },
              child: Container(
                margin: EdgeInsets.only(top: 5.h),
                padding: EdgeInsets.symmetric(vertical: 6.h),
                alignment: Alignment.center,
                child: myTxt(text: "不同意", color: Colors.black, fontSize: 14.sp),
              ),
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    double w = MediaQuery.of(context).size.width;
    double h = MediaQuery.of(context).size.height;

    return Scaffold(
      body: SizedBox(
        width: w,
        height: h,
        child: Stack(
          children: [
            // 轮播图片
            if (_splashImages.length == 1)
              // 只有一张图片时直接显示
              _buildSingleImage()
            else
              // 多张图片时使用轮播
              _buildCarousel(w, h),

            // 指示器（多张图片时显示）
            if (_splashImages.length > 1)
              Positioned(
                bottom: 50.h,
                left: 0,
                right: 0,
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: List.generate(
                    _splashImages.length,
                    (index) => AnimatedContainer(
                      duration: const Duration(milliseconds: 300),
                      margin: EdgeInsets.symmetric(horizontal: 4.w),
                      width: _currentIndex == index ? 20.w : 8.w,
                      height: 8.h,
                      decoration: BoxDecoration(
                        color: _currentIndex == index
                            ? Colors.white
                            : Colors.white.withOpacity(0.5),
                        borderRadius: BorderRadius.circular(4.r),
                      ),
                    ),
                  ),
                ),
              ),

            // 跳过按钮
            Positioned(
              top: 54.h,
              right: 20.w,
              child: GestureDetector(
                onTap: () {
                  _navigateTimer?.cancel();
                  _navigateToMain();
                },
                child: Container(
                  padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
                  decoration: BoxDecoration(
                    color: Colors.black.withOpacity(0.3),
                    borderRadius: BorderRadius.circular(20.r),
                  ),
                  child: myTxt(
                    text: "跳过",
                    color: Colors.white,
                    fontSize: 14.sp,
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  /// 构建单张图片
  Widget _buildSingleImage() {
    final imageUrl = _splashImages.first;
    if (imageUrl.startsWith('http') || imageUrl.startsWith('https')) {
      return LoadImage(imageUrl, fit: BoxFit.cover);
    } else {
      return Image.asset(imageUrl.startsWith('assets') ? imageUrl : 'assets/$imageUrl', fit: BoxFit.cover);
    }
  }

  /// 构建轮播
  Widget _buildCarousel(double w, double h) {
    return Swiper(
      itemCount: _splashImages.length,
      index: _currentIndex,
      onIndexChanged: (index) {
        if (mounted) {
          setState(() {
            _currentIndex = index;
          });
        }
      },
      itemBuilder: (BuildContext context, int index) {
        final imageUrl = _splashImages[index];
        if (imageUrl.startsWith('http') || imageUrl.startsWith('https')) {
          return LoadImage(imageUrl, fit: BoxFit.cover);
        } else {
          return Image.asset(
            imageUrl.startsWith('assets') ? imageUrl : 'assets/$imageUrl',
            fit: BoxFit.cover,
          );
        }
      },
      autoplay: false, // 使用自定义定时器控制
      loop: true,
      viewportFraction: 1.0,
      scale: 1.0,
    );
  }

  /// 导航到主页
  void _navigateToMain() async {
    bool? first = await getIsFirst();
    if (!mounted) return;
    if (first == true) {
      context.go('/main');
    } else {
      _showFirstDialog(context);
    }
  }
}