import 'dart:io';
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
import 'package:flutter/foundation.dart';
import 'package:process_run/process_run.dart';
import 'package:notube/models/video.dart';
import 'package:path/path.dart' as p;
import 'package:notube/services/file_logger.dart';

class ConverterService {
  late Directory tempDir;
  late String ffmpegPath;

  ConverterService._();

  static Future<ConverterService> init() async {
    FileLogger().d('Initializing DLServices');
    var dlService = ConverterService._();
    await dlService._init();
    return dlService;
  }

  Future<void> _init() async {
    tempDir = await getTemporaryDirectory();
    if (Platform.isWindows) {
      ffmpegPath = 'ffmpeg.exe';
    } else if (Platform.isLinux) {
      ffmpegPath = 'ffmpeg';
    } else if (Platform.isMacOS) {
      ffmpegPath = 'ffmpeg';
    }
    await checkFFmpeg();
  }

  Future<void> checkFFmpeg() async {
    try {
      var result = await Process.run(ffmpegPath, ['-version']);
      if (result.exitCode == 0) {
        print('FFmpeg is installed.');
        return;
      }
    } catch (e) {
      print('FFmpeg is not installed.');
    }
  }

  Future<File?> getTmpFile(String filename) async {
    final Directory directory = Directory('temp');
    final List<FileSystemEntity> files = directory.listSync();
    for (FileSystemEntity file in files) {
      final String dirFilename = p.basenameWithoutExtension(file.path);
      FileLogger().d('dirFilename $dirFilename');
      FileLogger().d('filename $filename');
      if (dirFilename == '${filename}_tmp') {
        return File(file.path);
      }
    }
    return null;
  }

  Future<Stream> convertFile(Video video) async {
    FileLogger().d(
        '____Converting ${video.title} to ${video.format.format} format_____');

    File tmpFile = File('temp/${video.filename}_tmp.mp4');
    if (!tmpFile.existsSync()) {
      tmpFile = await getTmpFile(video.filename) ??
          File('temp/${video.filename}_tmp.mp4');
    }

    File doneFile =
        File('temp/${video.filename}_done.${video.format.extension}');
    if (doneFile.existsSync()) {
      FileLogger().d('File already converted');
      return Stream.fromIterable(['progress=end']);
    }

    var command =
        '-i "${tmpFile.path}" ${video.format.ffmpegCmd} "temp/${video.filename}_done.${video.format.extension}"';

    var shellLinesController = ShellLinesController();
    var shell = Shell(
        stdout: shellLinesController.sink, stderr: shellLinesController.sink);

    await shell.run('''
      $ffmpegPath $command
    ''');

    return shellLinesController.stream;
  }
}