import 'dart:async';
import 'dart:io';
import 'dart:typed_data';

import 'package:flutter_ffmpeg/flutter_ffmpeg.dart';
import 'package:path_provider/path_provider.dart';

class G711 {
  Future<Uint8List?> decodeG711ToPCM(List<int> g711Data) async {
    try {
      FlutterFFmpeg flutterFFmpeg = FlutterFFmpeg();

      // Save G.711 data to a temporary file
      Directory appDocDir = await getApplicationDocumentsDirectory();
      String g711FilePath = '${appDocDir.path}/input.g711';
      await File(g711FilePath).writeAsBytes(g711Data);

      // Replace with the desired output PCM file path
      String pcmFilePath = '${appDocDir.path}/output.pcm';

      // Run FFmpeg command to decode G.711 to PCM
      String command =
          '-y -f u8 -ar 8000 -ac 1 -i $g711FilePath -f s16le -ar 8000 -ac 1 $pcmFilePath';
      int result = await flutterFFmpeg.execute(command);

      if (result == 0) {
        print('G.711 decoding successful! PCM file saved at: $pcmFilePath');

        // Read PCM data from file
        Uint8List pcmBytes = await File(pcmFilePath).readAsBytes();

        // Delete the temporary G.711 file
        await File(g711FilePath).delete();

        // Delete the temporary PCM file
        await File(pcmFilePath).delete();

        return pcmBytes;
      } else {
        print('Error during G.711 decoding: $result');
        return null;
      }
    } catch (e) {
      print('Error: $e');
      return null;
    }
  }

  Future<Uint8List?> encodePCMToG711(Uint8List pcmData) async {
    try {
      FlutterFFmpeg flutterFFmpeg = FlutterFFmpeg();

      // Save PCM data to a temporary file
      Directory appDocDir = await getApplicationDocumentsDirectory();
      String pcmFilePath = '${appDocDir.path}/input.pcm';
      await File(pcmFilePath).writeAsBytes(pcmData);

      // Replace with the desired output G.711 file path
      String g711FilePath = '${appDocDir.path}/output.g711';

      // Run FFmpeg command to encode PCM to G.711
      String command =
          '-y -f s16le -ar 8000 -ac 1 -i $pcmFilePath -f g711 -ar 8000 -ac 1 $g711FilePath';
      int result = await flutterFFmpeg.execute(command);

      if (result == 0) {
        print(
            'PCM encoding to G.711 successful! G.711 file saved at: $g711FilePath');

        // Read G.711 data from file
        Uint8List g711Bytes = await File(g711FilePath).readAsBytes();

        // Delete the temporary PCM file
        await File(pcmFilePath).delete();

        // Delete the temporary G.711 file
        await File(g711FilePath).delete();

        return g711Bytes;
      } else {
        print('Error during PCM encoding to G.711: $result');
        return null;
      }
    } catch (e) {
      print('Error: $e');
      return null;
    }
  }
}