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

import 'package:csv/csv.dart';
import 'package:flutter_email_sender/flutter_email_sender.dart';
import 'package:eagletracker/class/geoPosition.dart';
import 'package:path_provider/path_provider.dart';

/*
* Function to generate a CSV file with the positions array
*/
Future<File> generateCsv(List<GeoPosition> positions) async {
  List<List<dynamic>> csvData = [
    ['latitude', 'longitude', 'altitude', 'spped'] // Header
  ];

  for (var position in positions) {
    csvData.add([position.latitude, position.longitude, position.altitude]);
  }

  Directory appDocumentsDirectory = await getApplicationDocumentsDirectory();
  String appDocumentsPath = appDocumentsDirectory.path;

  String csvFilePath = '$appDocumentsPath/positions.csv';
  File csvFile = File(csvFilePath);

  String csvContent = const ListToCsvConverter().convert(csvData);
  await csvFile.writeAsString(csvContent);

  return csvFile;
}

/*
* Function to send an email with the CSV file as an attachment
*/
void sendEmailWithAttachment(File csvFile) async {
  final Email email = Email(
    subject: 'Eagle Tr@cker - Positions',
    body: 'Veuillez trouver ci-joint le fichier CSV contenant les positions.',
    recipients: [],
    attachmentPaths: [csvFile.path],
  );

  try {
    await FlutterEmailSender.send(email);
  } catch (error) {
    throw 'Failed to send email: $error';
  }
}

/*
* Function to get the values from the manufacturer data according to the data structure
*/
List<double> getValueFromAdvData(List<int> data) {
  double latitude = 0;
  double longitude = 0;
  double altitude = 0;
  double speed = 0;

  List<double> values = [];
  //Latitude
  List<int> dataLatitude = data.sublist(0, 4);
  ByteData byteDataLatitude =
      ByteData.sublistView(Uint8List.fromList(dataLatitude));
  latitude = byteDataLatitude.getFloat32(0, Endian.little);
  values.add(latitude);

  //Longitude
  List<int> dataLongitude = data.sublist(4, 8);
  ByteData byteDataLongitude =
      ByteData.sublistView(Uint8List.fromList(dataLongitude));
  longitude = byteDataLongitude.getFloat32(0, Endian.little);
  values.add(longitude);

  //Altitude
  List<int> dataAltitude = data.sublist(8, 12);
  ByteData byteDataAltitude =
      ByteData.sublistView(Uint8List.fromList(dataAltitude));
  altitude = byteDataAltitude.getFloat32(0, Endian.little);
  values.add(altitude);

  //Speed
  List<int> dataSpeed = data.sublist(12, 16);
  ByteData byteDataSpeed = ByteData.sublistView(Uint8List.fromList(dataSpeed));
  speed = byteDataSpeed.getFloat32(0, Endian.little);
  values.add(speed);

  return values;
}