mymuseum-visitapp/lib/Screens/Sections/Article/audio_player_tab.dart

import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:mymuseum_visitapp/Models/visitContext.dart';
import 'package:mymuseum_visitapp/app_context.dart';
import 'package:mymuseum_visitapp/constants.dart';
import 'package:provider/provider.dart';

import 'package:just_audio/just_audio.dart';
import 'package:just_audio_cache/just_audio_cache.dart';


class AudioPlayerTab extends StatefulWidget {
  const AudioPlayerTab({Key? key, required this.file, required this.resourceURl, required this.isAuto}) : super(key: key);

  final File? file;
  final String resourceURl;
  final bool isAuto;

  @override
  State<AudioPlayerTab> createState() => _AudioPlayerTabState();
}

class _AudioPlayerTabState extends State<AudioPlayerTab>
    with SingleTickerProviderStateMixin {
  static const double _collapsedWidth = 56;

  /// Hauteur unique : tout le lecteur tient sur une ligne, la pastille ne fait
  /// que s'élargir. Elle ne bouge donc pas verticalement en s'ouvrant.
  static const double _height = 60;

  /// Bornée à la largeur de l'écran : 320 en dur occupait presque toute la
  /// largeur d'un téléphone (~394 en logique), la pastille ne se lisait plus
  /// comme un panneau posé sur la page.
  double get _expandedWidth => screenSize.width * 0.78 < 320 ? screenSize.width * 0.78 : 320;

  AudioPlayer player = AudioPlayer();
  Uint8List? audiobytes = null;
  bool isplaying = false;
  bool audioplayed = false;
  int currentpos = 0;
  int maxduration = 100;
  Duration? durationAudio;
  String currentpostlabel = "00:00";

  bool _isExpanded = false;
  bool _showContent = false;
  late AnimationController _controller;

  /// Progression 0→1, pas des pixels : la largeur dépliée dépend de l'écran, qui
  /// n'est connu qu'à `didChangeDependencies`, après la création de l'animation.
  late Animation<double> _expansion;
  late Size screenSize;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    screenSize = MediaQuery.of(context).size;
  }

  @override
  void initState() {
    _controller = AnimationController(
        vsync: this, duration: const Duration(milliseconds: 300));
    _expansion = CurvedAnimation(parent: _controller, curve: Curves.easeInOut);

    //print("IN INITSTATE AUDDDIOOOO");
    Future.delayed(Duration.zero, () async {
      if(widget.file != null) {
        audiobytes = await fileToUint8List(widget.file!);
      }

      player.durationStream.listen((Duration? d) { //get the duration of audio
        if(d != null) {
          maxduration = d.inSeconds;
          durationAudio = d;
        }
      });

      //player.bufferedPositionStream

      player.positionStream.listen((event) {
        if(durationAudio != null) {

          currentpos = event.inMilliseconds; //get the current position of playing audio

          //generating the duration label
          int shours = Duration(milliseconds:durationAudio!.inMilliseconds - currentpos).inHours;
          int sminutes = Duration(milliseconds:durationAudio!.inMilliseconds - currentpos).inMinutes;
          int sseconds = Duration(milliseconds:durationAudio!.inMilliseconds - currentpos).inSeconds;

          int rminutes = sminutes - (shours * 60);
          int rseconds = sseconds - (sminutes * 60 + shours * 60 * 60);

          String minutesToShow = rminutes < 10 ? '0$rminutes': rminutes.toString();
          String secondsToShow = rseconds < 10 ? '0$rseconds': rseconds.toString();

          currentpostlabel = "$minutesToShow:$secondsToShow";

        }
        if(mounted && player.duration != null) {
          setState(() {
            //refresh the UI
            if(currentpos > player.duration!.inMilliseconds) {
              print("RESET ALL");
              player.stop();
              player.seek(const Duration(seconds: 0));
              isplaying = false;
              audioplayed = false;
              currentpostlabel = "00:00";
            }
          });
        }
      });

      /*player.onPositionChanged.listen((Duration  p){
        currentpos = p.inMilliseconds; //get the current position of playing audio

        //generating the duration label
        int shours = Duration(milliseconds:currentpos).inHours;
        int sminutes = Duration(milliseconds:currentpos).inMinutes;
        int sseconds = Duration(milliseconds:currentpos).inSeconds;

        int rminutes = sminutes - (shours * 60);
        int rseconds = sseconds - (sminutes * 60 + shours * 60 * 60);

        String minutesToShow = rminutes < 10 ? '0$rminutes': rminutes.toString();
        String secondsToShow = rseconds < 10 ? '0$rseconds': rseconds.toString();

        currentpostlabel = "$minutesToShow:$secondsToShow";

        setState(() {
          //refresh the UI
        });
      });*/

      if(audiobytes != null) {
        print("GOT AUDIOBYYYTES - LOCALLY SOSO");
        await player.setAudioSource(LoadedSource(audiobytes!));
      } else {
        print("GET SOUND BY URL");
        await player.dynamicSet(url: widget.resourceURl);
      }

      if(widget.isAuto) {
        //player.play(BytesSource(audiobytes));
        //
        player.play();
        setState(() {
          isplaying = true;
          audioplayed = true;
        });
      }
    });
    super.initState();
  }

  @override
  void dispose() async {
    _controller.dispose();
    Future.microtask(() async {
      await player.stop();
      await player.dispose();
    });
    super.dispose();
  }

  Future<Uint8List> fileToUint8List(File file) async {
    List<int> bytes = await file.readAsBytes();
    return Uint8List.fromList(bytes);
  }

  void _togglePlay() {
    if (isplaying) {
      player.pause();
      setState(() => isplaying = false);
    } else {
      player.play();
      setState(() {
        isplaying = true;
        audioplayed = true;
      });
    }
  }

  void _toggleExpansion() {
    setState(() {
      if (_isExpanded) {
        _showContent = false;
        _isExpanded = false;
      } else {
        _isExpanded = true;
        Future.delayed(const Duration(milliseconds: 300), () {
          if (_isExpanded && mounted) setState(() => _showContent = true);
        });
      }
      _isExpanded ? _controller.forward() : _controller.reverse();
    });
  }

  double get _progress =>
      maxduration > 0 ? (currentpos / (maxduration * 1000)).clamp(0.0, 1.0) : 0.0;

  @override
  Widget build(BuildContext context) {
    final appContext = Provider.of<AppContext>(context);
    VisitAppContext visitAppContext = appContext.getContext();

    final primaryColor = visitAppContext.configuration?.primaryColor != null
        ? Color(int.parse(
            visitAppContext.configuration!.primaryColor!.split('(0x')[1].split(')')[0],
            radix: 16))
        : kMainColor1;
    final double rounded =
        visitAppContext.currentAppConfigurationLink?.roundedValue?.toDouble() ?? 20.0;

    return AnimatedBuilder(
      animation: _expansion,
      builder: (context, child) {
        final t = _expansion.value;
        final width = _collapsedWidth + (_expandedWidth - _collapsedWidth) * t;

        final radius = BorderRadius.only(
          topLeft: Radius.circular(rounded),
          bottomLeft: Radius.circular(rounded),
        );

        return Positioned(
          right: 0,
          top: screenSize.height / 2 - _height / 2,
          child: CustomPaint(
            // La progression est le contour lui-même : le tracé suit le RRect, donc
            // il reste juste pendant que la pastille s'étire vers la gauche.
            foregroundPainter: _ProgressBorderPainter(
              progress: _progress,
              radius: radius,
              color: _isExpanded ? primaryColor : Colors.white,
            ),
            child: Container(
              width: width,
              height: _height,
              decoration: BoxDecoration(
                color: _isExpanded
                    ? kBackgroundColor
                    : primaryColor.withValues(alpha: 0.85),
                borderRadius: radius,
                // Posée sur une photo, la pastille a besoin de se détacher :
                // sans ombre et avec un fond translucide, le lecteur déplié
                // semblait flotter au milieu de l'image.
                boxShadow: const [
                  BoxShadow(color: Colors.black26, blurRadius: 12, offset: Offset(-2, 4)),
                ],
              ),
              child: _showContent
                  ? _expandedContent(primaryColor)
                  : IconButton(
                      icon: Icon(isplaying ? Icons.pause : Icons.play_arrow,
                          color: Colors.white),
                      onPressed: _toggleExpansion,
                    ),
            ),
          ),
        );
      },
    );
  }

  /// Tout sur une seule ligne, croix comprise : avec la fermeture sur sa propre
  /// rangée, la pastille devait doubler de hauteur pour s'ouvrir. Ici elle ne fait
  /// que s'élargir.
  Widget _expandedContent(Color primaryColor) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(12, 0, 4, 0),
      child: Row(
        children: [
          InkWell(
            onTap: _togglePlay,
            customBorder: const CircleBorder(),
            child: Container(
              width: 44,
              height: 44,
              decoration: BoxDecoration(color: primaryColor, shape: BoxShape.circle),
              child: Icon(isplaying ? Icons.pause : Icons.play_arrow,
                  color: Colors.white, size: 26),
            ),
          ),
          Expanded(
            child: SliderTheme(
              data: SliderTheme.of(context).copyWith(
                trackHeight: 3,
                activeTrackColor: primaryColor,
                inactiveTrackColor: kMainGrey,
                thumbColor: primaryColor,
                thumbShape: const RoundSliderThumbShape(enabledThumbRadius: 7),
                overlayShape: const RoundSliderOverlayShape(overlayRadius: 14),
              ),
              child: Slider(
                value: _progress,
                onChanged: maxduration > 0
                    ? (v) => player
                        .seek(Duration(milliseconds: (v * maxduration * 1000).round()))
                    : null,
              ),
            ),
          ),
          Text(
            currentpostlabel,
            style: const TextStyle(
              fontSize: 13,
              fontFeatures: [FontFeature.tabularFigures()],
            ),
          ),
          IconButton(
            icon: Icon(Icons.close, color: primaryColor, size: 20),
            onPressed: _toggleExpansion,
          ),
        ],
      ),
    );
  }
}

/// Ne dessine qu'une fraction du contour, mesurée le long du chemin plutôt qu'en
/// angles : un `RRect` n'a pas de centre unique, un arc ne suivrait pas ses coins.
class _ProgressBorderPainter extends CustomPainter {
  const _ProgressBorderPainter({
    required this.progress,
    required this.radius,
    required this.color,
  });

  final double progress;
  final BorderRadius radius;
  final Color color;

  /// Contour tracé à la main plutôt que par `addRRect` : celui-ci démarre au
  /// milieu du côté gauche, donc la progression naissait là. On part du coin bas
  /// droit et on tourne dans le sens horaire — bas, côté arrondi, haut, puis le
  /// bord collé à l'écran.
  Path _borderPath(Size size) {
    final w = size.width;
    final h = size.height;
    final tl = radius.topLeft.x;
    final bl = radius.bottomLeft.x;

    return Path()
      ..moveTo(w, h)
      ..lineTo(bl, h)
      ..arcToPoint(Offset(0, h - bl), radius: Radius.circular(bl), clockwise: true)
      ..lineTo(0, tl)
      ..arcToPoint(Offset(tl, 0), radius: Radius.circular(tl), clockwise: true)
      ..lineTo(w, 0)
      ..lineTo(w, h);
  }

  @override
  void paint(Canvas canvas, Size size) {
    final path = _borderPath(size);

    // Piste complète d'abord : sans elle, la pastille n'a aucun contour tant que
    // l'audio n'a pas démarré, et rien ne dit qu'elle en gagnera un.
    canvas.drawPath(
      path,
      Paint()
        ..style = PaintingStyle.stroke
        ..strokeWidth = 3
        ..color = color.withValues(alpha: 0.25),
    );

    if (progress <= 0) return;

    final paint = Paint()
      ..style = PaintingStyle.stroke
      ..strokeWidth = 3
      ..strokeCap = StrokeCap.round
      ..color = color;

    for (final metric in path.computeMetrics()) {
      canvas.drawPath(metric.extractPath(0, metric.length * progress), paint);
    }
  }

  @override
  bool shouldRepaint(_ProgressBorderPainter old) =>
      old.progress != progress || old.color != color || old.radius != radius;
}

// Feed your own stream of bytes into the player
class LoadedSource extends StreamAudioSource {
  final List<int> bytes;
  LoadedSource(this.bytes);

  @override
  Future<StreamAudioResponse> request([int? start, int? end]) async {
    start ??= 0;
    end ??= bytes.length;
    return StreamAudioResponse(
      sourceLength: bytes.length,
      contentLength: end - start,
      offset: start,
      stream: Stream.value(bytes.sublist(start, end)),
      contentType: 'audio/mpeg',
    );
  }
}