// ignore_for_file: avoid_print

import 'dart:io';

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:integration_test/integration_test.dart';
import 'package:path_provider/path_provider.dart';

import 'package:aves/services/cast/cast_fmp4_fragment_parser.dart';

void main() {
  IntegrationTestWidgetsFlutterBinding.ensureInitialized();

  const channel = MethodChannel(
    'aves/cast_video_optimizer',
  );

  testWidgets(
    'genera il primo segmento TS dal fragmented MP4',
    (tester) async {
      final cacheDirectory = await getApplicationCacheDirectory();

      final inputFile = File(
        '${cacheDirectory.path}/stream_test.fmp4',
      );

      final outputFile = File(
        '${cacheDirectory.path}/segment_00000.ts',
      );

      expect(
        await inputFile.exists(),
        isTrue,
        reason: 'Copia prima stream_test.fmp4 nella cache Android',
      );

      expect(
        await inputFile.length(),
        greaterThan(2344107),
      );

      if (await outputFile.exists()) {
        await outputFile.delete();
      }

      final partialOutput = File(
        '${outputFile.path}.part',
      );

      if (await partialOutput.exists()) {
        await partialOutput.delete();
      }

      const moofOffset = 1684;
      const moofSize = 3164;
      const mdatOffset = 4848;
      const mdatSize = 2339259;
      const mdatHeaderSize = 8;

      final source = await inputFile.open(
        mode: FileMode.read,
      );

      late final List<int> moofBytes;

      try {
        await source.setPosition(
          moofOffset,
        );

        moofBytes = await source.read(
          moofSize,
        );
      } finally {
        await source.close();
      }

      expect(
        moofBytes.length,
        moofSize,
      );

      const parser = CastFmp4FragmentParser();

      final fragment = parser.parse(
        moofBytes: Uint8List.fromList(
          moofBytes,
        ),
        moofOffset: moofOffset,
        mdatOffset: mdatOffset,
        mdatSize: mdatSize,
        mdatHeaderSize: mdatHeaderSize,
        initialDecodeTimes: const <int, int>{
          1: 0,
          2: 0,
        },
      );

      final audioTrack = fragment.tracks.singleWhere(
        (track) => track.trackId == 1,
      );

      final videoTrack = fragment.tracks.singleWhere(
        (track) => track.trackId == 2,
      );

      final audioSamples = audioTrack.samples
          .where(
            (sample) => sample.decodeTime < 144000,
          )
          .map(_sampleToMap)
          .toList(growable: false);

      final videoSamples = videoTrack.samples
          .where(
            (sample) => sample.decodeTime < 270000,
          )
          .map(_sampleToMap)
          .toList(growable: false);

      expect(
        audioSamples.length,
        inInclusiveRange(140, 143),
      );

      expect(
        videoSamples.length,
        90,
      );

      expect(
        videoTrack.samples.first.isSync,
        isTrue,
      );

      print(
        'FMP4 TOOL INPUT '
        'input=${inputFile.path} '
        'audioSamples=${audioSamples.length} '
        'videoSamples=${videoSamples.length}',
      );

      final report = await channel.invokeMapMethod<String, dynamic>(
        'writeFmp4FirstTsSegmentTest',
        <String, dynamic>{
          'inputPath': inputFile.path,
          'outputPath': outputFile.path,
          'audioSamples': audioSamples,
          'videoSamples': videoSamples,
        },
      );

      expect(
        report,
        isNotNull,
      );

      expect(
        report!['success'],
        isTrue,
      );

      expect(
        report['videoSamples'],
        90,
      );

      expect(
        report['audioSamples'],
        inInclusiveRange(140, 143),
      );

      expect(
        report['keyframes'],
        3,
      );

      expect(
        report['accessUnitDelimiterCount'],
        90,
      );

      expect(
        await outputFile.exists(),
        isTrue,
      );

      final outputBytes = await outputFile.length();

      expect(
        outputBytes,
        greaterThan(0),
      );

      expect(
        outputBytes % 188,
        0,
      );

      print(
        'FMP4 FIRST TS TOOL PASS '
        'output=${outputFile.path} '
        'bytes=$outputBytes '
        'report=$report',
      );
      print(
        'FILE READY FOR ADB COPY '
        'path=${outputFile.path} '
        'waitingSeconds=120',
      );

      await Future<void>.delayed(
        const Duration(minutes: 2),
      );
    },
  );
}

Map<String, dynamic> _sampleToMap(
  Fmp4SampleInfo sample,
) {
  return <String, dynamic>{
    'offset': sample.absoluteOffset,
    'size': sample.size,
    'dts': sample.decodeTime,
    'pts': sample.presentationTime,
    'duration': sample.duration,
    'sync': sample.isSync,
  };
}