import 'dart:async';

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:hgdj/assets_tool/app_colors.dart';
import 'package:hgdj/assets_tool/images.dart';
import 'package:hgdj/hj_utils/screen.dart';

import '../../hj_model/splash/ads_model.dart';
import '../../routers/jump_router.dart';
import '../../tools_base/banner/ads_banner_widget.dart';
import '../../tools_base/banner/ads_item.dart';
import '../../tools_base/widget/net_image_widget.dart';

/// 启动页广告：3 秒倒计时后右上角按钮变为"关闭"，点击触发 callback 跳首页
class SplashAdView extends StatefulWidget {
  final List<AdsInfoModel>? adData;
  final Function? callback;

  const SplashAdView({
    super.key,
    this.adData,
    this.callback,
  });

  @override
  State<StatefulWidget> createState() => _SplashAdViewState();
}

class _SplashAdViewState extends State<SplashAdView> {
  int count = 3;
  Timer? timer;

  @override
  void initState() {
    super.initState();
    timer = Timer.periodic(const Duration(seconds: 1), (t) {
      count--;
      setState(() {});
      if (count <= 0) t.cancel();
    });
  }

  @override
  void dispose() {
    timer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Stack(
      fit: StackFit.expand,
      children: <Widget>[
        _buildAdContent(),
        SafeArea(
          child: Align(
            alignment: Alignment.topRight,
            child: Padding(
              padding: const EdgeInsets.only(top: 28, right: 17),
              child: _buildCountdownButton(),
            ),
          ),
        ),
      ],
    );
  }

  /// 三种展示形态：1 张走单图点击跳转，多张走轮播组件，无广告则显示默认启动图
  Widget _buildAdContent() {
    final dataLen = widget.adData?.length ?? 0;
    if (dataLen == 1) {
      final ad = widget.adData!.first;
      return GestureDetector(
        onTap: () => pushToPageByLink(ad.href ?? ""),
        child: Container(
          alignment: Alignment.center,
          child: NetworkImageLoader(
            imageUrl: ad.cover ?? "",
            width: screen.screenWidth,
            height: screen.screenHeight,
            fit: BoxFit.cover,
            placeHolderWidget: _splashBg(),
          ),
        ),
      );
    }
    if (dataLen > 1) {
      return Container(
        color: Color(0xff151515),
        child: SplashBannerWidget(adData: widget.adData ?? []),
      );
    }
    return _splashBg();
  }

  Widget _splashBg() => Image.asset(
        'ic_splash_bg.webp'.launchPath,
        fit: BoxFit.fill,
        width: Get.width,
        height: Get.height,
      );

  Widget _buildCountdownButton() {
    return GestureDetector(
      // 倒计时未结束时点击无效，避免用户误触跳过广告
      onTap: () {
        if (count <= 0) widget.callback?.call();
      },
      child: Container(
        height: 36,
        width: 77,
        alignment: Alignment.center,
        decoration: BoxDecoration(
          color: Colors.black.withValues(alpha: 0.5),
          borderRadius: BorderRadius.circular(18),
        ),
        child: AnimatedSwitcher(
          duration: const Duration(milliseconds: 300),
          transitionBuilder: (child, anim) {
            // 倒计时递减:新数字从上滑入、旧数字向下滑出(下翻效果)
            final isIncoming = child.key == ValueKey(count);
            final begin = isIncoming ? const Offset(0, -1) : const Offset(0, 1);
            return ClipRect(
              child: SlideTransition(
                position:
                    Tween<Offset>(begin: begin, end: Offset.zero).animate(anim),
                child: child,
              ),
            );
          },
          child: count > 0
              ? Text(
                  count.toString(),
                  key: ValueKey(count),
                  style: const TextStyle(
                    color: Colors.white,
                    fontSize: 18,
                    fontWeight: FontWeight.w600,
                  ),
                )
              : const Text(
                  "关闭",
                  key: ValueKey(0),
                  style: TextStyle(color: Colors.white, fontSize: 16),
                ),
        ),
      ),
    );
  }
}

/// 启动页多广告轮播：2.5 秒自动切换，底部圆点指示器，左右双向无限滑
class SplashBannerWidget extends StatefulWidget {
  final List<AdsInfoModel> adData;

  const SplashBannerWidget({
    super.key,
    required this.adData,
  });

  @override
  State<StatefulWidget> createState() => _SplashBannerWidgetState();
}

class _SplashBannerWidgetState extends State<SplashBannerWidget> {
  late final PageController _pageCtr;
  Timer? _timer;

  List<AdsInfoModel> get _ads => widget.adData;
  int get _len => _ads.length;

  @override
  void initState() {
    super.initState();
    _pageCtr = PageController(initialPage: 0);
    _pageCtr.addListener(_onPageScroll);
    // 延迟启动自动轮播，避免和入场动画冲突；mounted 检查防止 dispose 后启动 timer
    if (_len > 1) {
      Future.delayed(const Duration(seconds: 1), () {
        if (!mounted) return;
        _timer = Timer.periodic(const Duration(milliseconds: 2500), _onTimer);
      });
    }
  }

  @override
  void dispose() {
    _timer?.cancel();
    _pageCtr.removeListener(_onPageScroll);
    _pageCtr.dispose();
    super.dispose();
  }

  void _onPageScroll() {
    if (mounted) setState(() {});
  }

  void _onTimer(Timer timer) {
    final page = _pageCtr.page?.toInt() ?? 0;
    _pageCtr.animateToPage(
      page + 1,
      duration: const Duration(milliseconds: 500),
      curve: Curves.ease,
    );
  }

  @override
  Widget build(BuildContext context) {
    if (_ads.isEmpty) return const SizedBox();
    return Stack(
      fit: StackFit.expand,
      children: [
        PageView.builder(
          controller: _pageCtr,
          itemCount: 1000 + _len * 100,
          allowImplicitScrolling: true,
          onPageChanged: (index) => setState(() {}),
          itemBuilder: (ctx, index) {
            final ad = _ads[index % _len];
            return AdsItem(
              adInfo: ad,
              showType: AdShowType.splash,
            );
          },
        ),
        Positioned(
          bottom: 7,
          child: _buildIndicator(),
        ),
      ],
    );
  }

  Widget _buildIndicator() {
    int curPageIndex = 0;
    if (_pageCtr.hasClients && _ads.isNotEmpty) {
      curPageIndex = ((_pageCtr.offset + 200.0) ~/ screen.screenWidth) % _len;
    }
    // 复用共用指示器(自带切换动画)；尺寸沿用启动页原值
    return SizedBox(
      width: Get.width - 14 * 2,
      child: Center(
        child: CIndicator(
          itemCount: _len,
          selectIndex: curPageIndex,
          space: 10,
          dotSize: 8,
          selectWidth: 25,
          color: Colors.white.withValues(alpha: 0.5),
          selectColor: AppColors.actionRed.withValues(alpha: 0.5),
        ),
      ),
    );
  }
}