import 'dart:typed_data';
import 'package:fis_vid/data_host/base/data_host.dart';
import 'package:vid/us/vid_us_image_data.dart';
import 'package:fis_vid/data_host/interface/data_host.dart';
import 'package:vid/us/vid_us_image.dart';
import 'package:vid/us/vid_us_probe.dart';

class VidDataHostLocal extends VidDataHostBase {
  VidDataHostLocal(this.fileContent) : super("empty_url");

  VidUsImageData? _data;

  final Uint8List fileContent;

  @override
  VidUsProbe get probe => _data!.probe;

  @override
  Future<VidDataHostLoadInfo?> load() async {
    final vidFileBuffer = fileContent;
    _data = VidUsImageData(vidFileBuffer);
    return VidDataHostLoadInfo(probe);
  }

  @override
  Future<VidUsImageData?> getData() async => _data;

  @override
  Future<VidUsImage> getFrame(int index) async {
    if (_data == null) {
      throw Exception(
          "[VidDataHost] getFrame: must call load first and data is not null.");
    }

    final frame = _data!.getImage(index);
    frameLoaded.emit(this, frame);
    return frame;
  }

  @override
  Future<void> release() async {
    _data = null;
  }

  @override
  int get frameCount => _data == null ? -1 : _data!.imageCount;
}