import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.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_model/drama_media_info.dart';
import 'package:hgdj/hj_page/drama/drama_detail_logic.dart';
import 'package:hgdj/hj_page/drama/view/drama_bottom_bar.dart';
import 'package:hgdj/hj_page/drama/view/drama_video_player.dart';
import 'package:hgdj/hj_utils/screen.dart';
import 'package:hgdj/tools_base/loading/loading_center_widget.dart';
import 'package:hgdj/tools_base/unique_tag_mixin.dart';

/// 短剧二级页：竖划切集 + 底部剧集条(选集/自动续播)
class DramaDetailPage extends StatefulWidget {
  final DramaMediaInfo? drama;

  /// 指定进来先播第几集(下标)；<0 表示不指定，交给续播位置决定
  final int initialIndex;

  /// 一级页刷剧模式带进来的秒数：只作用在 [initialIndex] 那一集。
  /// 从历史记录/收藏进来的不传，那边的位置由本地续播记录决定
  final int initialSeconds;

  /// 指定先播哪一集(分集 id)，优先级高于 [initialIndex] 和续播位置。缓存页点某一集进来用
  final String? initialContentId;

  const DramaDetailPage({
    super.key,
    this.drama,
    this.initialIndex = -1,
    this.initialSeconds = 0,
    this.initialContentId,
  });

  @override
  State<DramaDetailPage> createState() => _DramaDetailPageState();
}

class _DramaDetailPageState extends State<DramaDetailPage> with UniqueTagMixin {
  //底部剧集条整体高度(36 内容 + 上下 6 外边距)，播放器进度条据此让位
  static const _barHeight = 48.0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.primaryColor,
      body: GetBuilder<DramaDetailLogic>(
        tag: uniqueTag, // 可重复 push，按实例隔离
        init: DramaDetailLogic(
          widget.drama,
          initialIndex: widget.initialIndex,
          initialContentId: widget.initialContentId,
          initialSeconds: widget.initialSeconds,
        ),
        builder: (logic) {
          if (!logic.isFirstLoaded) return const LoadingCenterWidget();
          if (logic.episodeVideos.isEmpty)
            return CErrorWidget(retryOnTap: logic.loadDetail);
          return Stack(
            fit: StackFit.expand,
            children: [
              _episodeFeed(),
              _backButton(),
              _speedButton(logic),
              Positioned(left: 0, right: 0, bottom: 0, child: _bottomBar()),
            ],
          );
        },
      ),
    );
  }

  /// 竖向翻集：当前页变化时只 update([idFeed])，各 item 重算 isCurrentPage
  Widget _episodeFeed() {
    return GetBuilder<DramaDetailLogic>(
      tag: uniqueTag,
      id: DramaDetailLogic.idFeed,
      builder: (logic) => NotificationListener<ScrollNotification>(
        onNotification: (n) {
          logic.onScroll(n);
          return false;
        },
        child: PageView.builder(
          controller: logic.pageCtr,
          onPageChanged: logic.onPageChanged,
          physics: const ClampingScrollPhysics(),
          scrollDirection: Axis.vertical,
          allowImplicitScrolling: true,
          itemCount: logic.episodeVideos.length,
          itemBuilder: (context, index) {
            //每集的 VideoModel.id 都是剧 id，key 必须用子集 id，否则 PageView 会跨集复用 State
            return DramaVideoPlayer(
              key: ValueKey(logic.episodes[index].id ?? index),
              index: index,
              isCurrentPage: logic.pageIndex == index,
              videoInfo: logic.episodeVideos[index],
              showEntry: false, // 已经在剧里了，剧名不带箭头、底部条由本页画
              isScrolling: logic.isScrolling,
              progressBottom: _barHeight + Get.mediaQuery.padding.bottom,
              speed: logic.speed,
              //带进来的秒数只给落地那一集，其余从本地续播位置起播
              startSeconds: logic.takeStartSeconds(index),
              onCompleted: logic.onCompleted,
              onRemaining: logic.onRemaining,
              onCardUnlocked: logic.onCardUnlocked,
            );
          },
        ),
      ),
    );
  }

  /// 底部剧集条：正常展示「观看完整剧集·全N集」，距本集结束 5 秒内切成「Ns后播放下一集」
  Widget _bottomBar() {
    return SafeArea(
      top: false,
      child: GetBuilder<DramaDetailLogic>(
        tag: uniqueTag,
        id: DramaDetailLogic.idBar,
        builder: (logic) {
          final seconds = logic.nextSeconds;
          return DramaBottomBar(
            highlight: seconds > 0 ? '${seconds}s后' : null,
            text: seconds > 0
                ? '播放下一集'
                : '观看完整剧集·全${logic.info?.totalEpisode ?? logic.episodes.length}集',
            onTap: logic.openEpisodeSheet,
          );
        },
      ),
    );
  }

  /// 右上角倍速入口（设计稿 NavBar：秒表 18 + 间距 4 + 12/中等，无底无框）
  Widget _speedButton(DramaDetailLogic logic) {
    return Positioned(
      top: 20,
      right: 16,
      child: SafeArea(
        //高度对齐左上角返回键(24 图标 + IconButton 的 8 内边距 = 40)，两边看着在一条线上
        child: SizedBox(
          height: 40,
          child: Center(
            child: InkWell(
              enableFeedback: false,
              onTap: logic.openSpeedSheet,
              child: Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  //导出的图标描边是 #292929，设计稿里是白的，运行时染白
                  SvgPicture.asset(
                    'stopwatch.svg'.videoPath,
                    width: 18,
                    height: 18,
                    colorFilter:
                        const ColorFilter.mode(Colors.white, BlendMode.srcIn),
                  ),
                  4.sizeBoxW,
                  Text(
                    '${logic.speed}x',
                    style: const TextStyle(
                        color: Colors.white,
                        fontSize: 12,
                        height: 18 / 12,
                        fontWeight: FontWeight.w500),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }

  Widget _backButton() {
    return Positioned(
      top: 20,
      child: SafeArea(
        child: IconButton(
          icon: const Icon(
            Icons.arrow_back_ios,
            color: Colors.white,
            shadows: [
              Shadow(color: Colors.black, offset: Offset(1, 1), blurRadius: 1)
            ],
          ),
          onPressed: Get.back,
        ),
      ),
    );
  }
}