// ignore_for_file: constant_identifier_names

import 'parser.dart';
import 'sentence.dart';

const TypeGSV = "GSV";

class GSV {
  int totalMessages;
  int messageNumber;
  int numberSVsInView;
  List<GSVInfo> info;
  int systemID;
  int signalID;
  GSV(
      {required this.totalMessages,
      required this.messageNumber,
      required this.numberSVsInView,
      required this.info,
      required this.systemID,
      required this.signalID});
  static GSV newGSV(BaseSentence s) {
    var p = Parser(s);
    var gsv = GSV(
      totalMessages: p.int64(0, "total number of messages"),
      messageNumber: p.int64(1, "message number"),
      numberSVsInView: p.int64(2, "number of SVs in view"),
      info: [],
      systemID: 0,
      signalID: 0,
    );

    int i = 0;
    for (; i < 4; i++) {
      if (6 + i * 4 >= s.fields.length) {
        break;
      }
      gsv.info.add(GSVInfo(
        svprnNumber: p.int64(3 + i * 4, "SV prn number"),
        elevation: p.int64(4 + i * 4, "elevation"),
        azimuth: p.int64(5 + i * 4, "azimuth"),
        snr: p.int64(6 + i * 4, "SNR"),
      ));
    }
    var idxSID = (6 + (i - 1) * 4) + 1;
    if (s.fields.length == idxSID + 2) {
      gsv.systemID = p.int64(idxSID, "system ID");
      gsv.signalID = p.int64(idxSID + 1, "signal ID");
    }
    if (s.fields.length == idxSID + 1) {
      gsv.signalID = p.int64(idxSID, "signal ID");
    }

    return gsv;
  }
}

class GSVInfo {
  int svprnNumber;
  int elevation;
  int azimuth;
  int snr;

  GSVInfo(
      {required this.svprnNumber,
      required this.elevation,
      required this.azimuth,
      required this.snr});
}