aves/lib/widgets/viewer/overlay/video/progress_bar.dart

import 'dart:async';

import 'package:aves/model/settings/settings.dart';
import 'package:aves/ref/locales.dart';
import 'package:aves/theme/format.dart';
import 'package:aves/theme/icons.dart';
import 'package:aves/theme/styles.dart';
import 'package:aves/theme/themes.dart';
import 'package:aves/widgets/common/extensions/theme.dart';
import 'package:aves/widgets/common/fx/blurred.dart';
import 'package:aves/widgets/common/fx/borders.dart';
import 'package:aves_video/aves_video.dart';
import 'package:flutter/material.dart';

class VideoProgressBar extends StatefulWidget {
  final AvesVideoController? controller;
  final Animation<double> scale;

  const VideoProgressBar({
    super.key,
    required this.controller,
    required this.scale,
  });

  @override
  State<VideoProgressBar> createState() => _VideoProgressBarState();
}

class _VideoProgressBarState extends State<VideoProgressBar> {
  final GlobalKey _progressBarKey = GlobalKey(debugLabel: 'video-progress-bar');
  bool _playingOnDragStart = false;

  static const double radius = 123;

  AvesVideoController? get controller => widget.controller;

  Stream<int> get positionStream => controller?.positionStream ?? Stream.value(0);

  bool get isPlaying => controller?.isPlaying ?? false;

  ValueNotifier<ABRepeat?> get abRepeatNotifier => controller?.abRepeatNotifier ?? ValueNotifier(null);

  @override
  Widget build(BuildContext context) {
    final blurred = settings.enableBlurEffect;
    final theme = Theme.of(context);
    final textStyle = TextStyle(
      shadows: theme.isDark ? AStyles.embossShadows : null,
    );
    const strutStyle = StrutStyle(
      forceStrutHeight: true,
    );
    return SizeTransition(
      sizeFactor: widget.scale,
      child: BlurredRRect.all(
        enabled: blurred,
        borderRadius: radius,
        child: GestureDetector(
          onTapDown: (details) {
            _seekFromTap(details.globalPosition);
          },
          onHorizontalDragStart: (details) {
            _playingOnDragStart = isPlaying;
            if (_playingOnDragStart) controller!.pause();
          },
          onHorizontalDragUpdate: (details) {
            _seekFromTap(details.globalPosition);
          },
          onHorizontalDragEnd: (details) {
            if (_playingOnDragStart) controller!.play();
          },
          child: ConstrainedBox(
            constraints: const BoxConstraints(minHeight: kMinInteractiveDimension),
            child: Container(
              padding: const EdgeInsets.symmetric(horizontal: 16),
              decoration: BoxDecoration(
                color: Themes.overlayBackgroundColor(brightness: theme.brightness, blurred: blurred),
                border: AvesBorder.border(context),
                borderRadius: const BorderRadius.all(Radius.circular(radius)),
              ),
              child: MediaQuery(
                data: MediaQuery.of(context).copyWith(
                  textScaler: TextScaler.noScaling,
                ),
                child: ValueListenableBuilder<ABRepeat?>(
                  valueListenable: abRepeatNotifier,
                  builder: (context, abRepeat, child) {
                    return Stack(
                      fit: StackFit.passthrough,
                      children: [
                        if (abRepeat != null) ...[
                          _buildABRepeatMark(context, abRepeat.start),
                          _buildABRepeatMark(context, abRepeat.end),
                        ],
                        Container(
                          key: _progressBarKey,
                          alignment: Alignment.center,
                          padding: const EdgeInsets.symmetric(vertical: 4),
                          child: Column(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              Row(
                                children: [
                                  StreamBuilder<int>(
                                      stream: positionStream,
                                      builder: (context, snapshot) {
                                        // do not use stream snapshot because it is obsolete when switching between videos
                                        final position = controller?.currentPosition.floor() ?? 0;
                                        return Text(
                                          formatFriendlyDuration(Duration(milliseconds: position)),
                                          style: textStyle,
                                          strutStyle: strutStyle,
                                        );
                                      }),
                                  const Spacer(),
                                  Text(
                                    formatFriendlyDuration(Duration(milliseconds: controller?.duration ?? 0)),
                                    style: textStyle,
                                    strutStyle: strutStyle,
                                  ),
                                ],
                              ),
                              ClipRRect(
                                borderRadius: const BorderRadius.all(Radius.circular(4)),
                                child: Directionality(
                                  textDirection: videoPlaybackDirection,
                                  child: StreamBuilder<int>(
                                      stream: positionStream,
                                      builder: (context, snapshot) {
                                        // do not use stream snapshot because it is obsolete when switching between videos
                                        var progress = controller?.progress ?? 0.0;
                                        if (!progress.isFinite) progress = 0.0;
                                        return LinearProgressIndicator(
                                          value: progress,
                                          backgroundColor: Theme.of(context).colorScheme.onSurface.withOpacity(.2),
                                        );
                                      }),
                                ),
                              ),
                              Row(
                                children: [
                                  _buildSpeedIndicator(),
                                  _buildMuteIndicator(),
                                  Text(
                                    // fake text below to match the height of the text above and center the whole thing
                                    '',
                                    style: textStyle,
                                    strutStyle: strutStyle,
                                  ),
                                ],
                              ),
                            ],
                          ),
                        ),
                      ],
                    );
                  },
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildABRepeatMark(BuildContext context, int? position) {
    if (controller == null || position == null) return const SizedBox();
    return Positioned(
      left: _progressToDx(position / controller!.duration),
      top: 0,
      bottom: 0,
      child: Container(
        decoration: BoxDecoration(
          border: Border(left: AvesBorder.straightSide(context, width: 2)),
        ),
      ),
    );
  }

  Widget _buildSpeedIndicator() => StreamBuilder<double>(
        stream: controller?.speedStream ?? Stream.value(1.0),
        builder: (context, snapshot) {
          final speed = controller?.speed ?? 1.0;
          return speed != 1
              ? Padding(
                  padding: const EdgeInsetsDirectional.only(end: 8),
                  child: Text('x$speed'),
                )
              : const SizedBox();
        },
      );

  Widget _buildMuteIndicator() => StreamBuilder<double>(
        stream: controller?.volumeStream ?? Stream.value(1.0),
        builder: (context, snapshot) {
          final textScaler = MediaQuery.textScalerOf(context);
          final isMuted = controller?.isMuted ?? false;
          return isMuted
              ? Padding(
                  padding: const EdgeInsetsDirectional.only(end: 8),
                  child: Icon(
                    AIcons.mute,
                    size: textScaler.scale(16),
                  ),
                )
              : const SizedBox();
        },
      );

  RenderBox? _getProgressBarRenderBox() {
    return _progressBarKey.currentContext?.findRenderObject() as RenderBox?;
  }

  void _seekFromTap(Offset globalPosition) async {
    final box = _getProgressBarRenderBox();
    if (controller == null || box == null) return;

    final dx = box.globalToLocal(globalPosition).dx;
    await controller!.seekToProgress(dx / box.size.width);
  }

  double? _progressToDx(double progress) {
    final box = _getProgressBarRenderBox();
    return box == null ? null : progress * box.size.width;
  }
}