ente/lib/ui/viewer/file/zoomable_live_image_new.dart

import "dart:io";

import 'package:flutter/material.dart';
import 'package:logging/logging.dart';
import "package:media_kit/media_kit.dart";
import "package:media_kit_video/media_kit_video.dart";
import 'package:motion_photos/motion_photos.dart';
import "package:photos/generated/l10n.dart";
import "package:photos/models/file/extensions/file_props.dart";
import 'package:photos/models/file/file.dart';
import "package:photos/models/metadata/file_magic.dart";
import "package:photos/services/file_magic_service.dart";
import "package:photos/services/local_file_update_service.dart";
import 'package:photos/ui/viewer/file/zoomable_image.dart';
import 'package:photos/utils/file_util.dart';
import 'package:photos/utils/toast_util.dart';

class ZoomableLiveImageNew extends StatefulWidget {
  final EnteFile enteFile;
  final String? tagPrefix;
  final Decoration? backgroundDecoration;

  const ZoomableLiveImageNew(
    this.enteFile, {
    Key? key,
    required this.tagPrefix,
    this.backgroundDecoration,
  }) : super(key: key);

  @override
  State<ZoomableLiveImageNew> createState() => _ZoomableLiveImageNewState();
}

class _ZoomableLiveImageNewState extends State<ZoomableLiveImageNew>
    with SingleTickerProviderStateMixin {
  final Logger _logger = Logger("ZoomableLiveImage");
  late EnteFile _enteFile;
  bool _showVideo = false;
  bool _isLoadingVideoPlayer = false;

  late final _player = Player();
  VideoController? _videoController;

  @override
  void initState() {
    _enteFile = widget.enteFile;
    _logger.info(
      'initState for ${_enteFile.generatedID} with tag ${_enteFile.tag} and name ${_enteFile.displayName}',
    );
    if (_enteFile.isLivePhoto && _enteFile.isUploaded) {
      LocalFileUpdateService.instance.checkLivePhoto(_enteFile).ignore();
    }
    super.initState();
  }

  void _onLongPressEvent(bool isPressed) {
    if (_videoController != null && isPressed == false) {
      // stop playing video
      _videoController!.player.pause();
    }
    if (mounted) {
      setState(() {
        _showVideo = isPressed;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    Widget content;
    // check is long press is selected but videoPlayer is not configured yet
    if (_showVideo && _videoController == null) {
      _loadLiveVideo();
    }

    if (_showVideo && _videoController != null) {
      content = _getVideoPlayer();
    } else {
      content = ZoomableImage(
        _enteFile,
        tagPrefix: widget.tagPrefix,
        backgroundDecoration: widget.backgroundDecoration,
      );
    }
    return GestureDetector(
      onLongPressStart: (_) => {_onLongPressEvent(true)},
      onLongPressEnd: (_) => {_onLongPressEvent(false)},
      child: content,
    );
  }

  @override
  void dispose() {
    if (_videoController != null) {
      _videoController!.player.stop();
      _videoController!.player.dispose();
    }
    super.dispose();
  }

  Widget _getVideoPlayer() {
    _videoController!.player.seek(Duration.zero);
    _videoController!.player.setPlaylistMode(PlaylistMode.single);
    _videoController!.player.play();
    return Container(
      color: Colors.black,
      child: Video(
        controller: _videoController!,
        controls: null,
      ),
    );
  }

  Future<void> _loadLiveVideo() async {
    // do nothing is already loading or loaded
    if (_isLoadingVideoPlayer || _videoController != null) {
      return;
    }
    _isLoadingVideoPlayer = true;
    // For non-live photo, with fileType as Image, we still call _getMotionPhoto
    // to check if it is a motion photo. This is needed to handle earlier
    // uploads and upload from desktop
    final File? videoFile = _enteFile.isLivePhoto
        ? await _getLivePhotoVideo()
        : await _getMotionPhotoVideo();

    if (videoFile != null && videoFile.existsSync()) {
      _setVideoController(videoFile.path);
    } else if (_enteFile.isLivePhoto) {
      showShortToast(context, S.of(context).downloadFailed);
    }
    _isLoadingVideoPlayer = false;
  }

  Future<File?> _getLivePhotoVideo() async {
    if (_enteFile.isRemoteFile &&
        !(await isFileCached(_enteFile, liveVideo: true))) {
      showShortToast(context, S.of(context).downloading);
    }

    File? videoFile = await getFile(widget.enteFile, liveVideo: true)
        .timeout(const Duration(seconds: 15))
        .onError((dynamic e, s) {
      _logger.info("getFile failed ${_enteFile.tag}", e);
      return null;
    });

    // FixMe: Here, we are fetching video directly when getFile failed
    // getFile with liveVideo as true can fail for file with localID when
    // the live photo was downloaded from remote.
    if ((videoFile == null || !videoFile.existsSync()) &&
        _enteFile.uploadedFileID != null) {
      videoFile = await getFileFromServer(widget.enteFile, liveVideo: true)
          .timeout(const Duration(seconds: 15))
          .onError((dynamic e, s) {
        _logger.info("getRemoteFile failed ${_enteFile.tag}", e);
        return null;
      });
    }
    return videoFile;
  }

  Future<File?> _getMotionPhotoVideo() async {
    if (_enteFile.isRemoteFile && !(await isFileCached(_enteFile))) {
      showShortToast(context, S.of(context).downloading);
    }

    final File? imageFile = await getFile(
      widget.enteFile,
      isOrigin: !Platform.isAndroid,
    ).timeout(const Duration(seconds: 15)).onError((dynamic e, s) {
      _logger.info("getFile failed ${_enteFile.tag}", e);
      return null;
    });
    if (imageFile != null) {
      final motionPhoto = MotionPhotos(imageFile.path);
      final index = await motionPhoto.getMotionVideoIndex();
      if (index != null) {
        // Update the metadata if it is not updated
        if (!_enteFile.isMotionPhoto && _enteFile.canEditMetaInfo) {
          FileMagicService.instance.updatePublicMagicMetadata(
            [_enteFile],
            {motionVideoIndexKey: index.start},
          ).ignore();
        }
        return motionPhoto.getMotionVideoFile(
          index: index,
        );
      } else if (_enteFile.isMotionPhoto && _enteFile.canEditMetaInfo) {
        _logger.finest('Incorrectly tagged as MP, reset tag ${_enteFile.tag}');
        FileMagicService.instance.updatePublicMagicMetadata(
          [_enteFile],
          {motionVideoIndexKey: 0},
        ).ignore();
      }
    }
    return null;
  }

  void _setVideoController(String url) {
    if (mounted) {
      setState(() {
        _videoController = VideoController(_player);
        _player.open(Media(url));
        _showVideo = true;
      });
    }
  }
}