enum LoRaBandwidth {
  bw7_8(7800, '7.8 kHz'),
  bw10_4(10400, '10.4 kHz'),
  bw15_6(15600, '15.6 kHz'),
  bw20_8(20800, '20.8 kHz'),
  bw31_25(31250, '31.25 kHz'),
  bw41_7(41700, '41.7 kHz'),
  bw62_5(62500, '62.5 kHz'),
  bw125(125000, '125 kHz'),
  bw250(250000, '250 kHz'),
  bw500(500000, '500 kHz');

  final int hz;
  final String label;

  const LoRaBandwidth(this.hz, this.label);
}

enum LoRaSpreadingFactor {
  sf5(5, 'SF5'),
  sf6(6, 'SF6'),
  sf7(7, 'SF7'),
  sf8(8, 'SF8'),
  sf9(9, 'SF9'),
  sf10(10, 'SF10'),
  sf11(11, 'SF11'),
  sf12(12, 'SF12');

  final int value;
  final String label;

  const LoRaSpreadingFactor(this.value, this.label);
}

enum LoRaCodingRate {
  cr4_5(5, '4/5'),
  cr4_6(6, '4/6'),
  cr4_7(7, '4/7'),
  cr4_8(8, '4/8');

  final int value;
  final String label;

  const LoRaCodingRate(this.value, this.label);
}

class RadioSettings {
  final double frequencyMHz;
  final LoRaBandwidth bandwidth;
  final LoRaSpreadingFactor spreadingFactor;
  final LoRaCodingRate codingRate;
  final int txPowerDbm;

  RadioSettings({
    required this.frequencyMHz,
    required this.bandwidth,
    required this.spreadingFactor,
    required this.codingRate,
    required this.txPowerDbm,
  });

  // Regional preset configurations
  static final List<(String, RadioSettings)> presets = [
    (
      'Australia',
      RadioSettings(
        frequencyMHz: 915.8,
        bandwidth: LoRaBandwidth.bw250,
        spreadingFactor: LoRaSpreadingFactor.sf10,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'Australia (Narrow)',
      RadioSettings(
        frequencyMHz: 916.575,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf7,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'Australia SA, WA, QLD',
      RadioSettings(
        frequencyMHz: 923.125,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf8,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'Czech Republic',
      RadioSettings(
        frequencyMHz: 869.432,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf7,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 14,
      ),
    ),
    (
      'EU 433MHz',
      RadioSettings(
        frequencyMHz: 433.650,
        bandwidth: LoRaBandwidth.bw250,
        spreadingFactor: LoRaSpreadingFactor.sf11,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'EU/UK (Long Range)',
      RadioSettings(
        frequencyMHz: 869.525,
        bandwidth: LoRaBandwidth.bw250,
        spreadingFactor: LoRaSpreadingFactor.sf11,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 14,
      ),
    ),
    (
      'EU/UK (Medium Range)',
      RadioSettings(
        frequencyMHz: 869.525,
        bandwidth: LoRaBandwidth.bw250,
        spreadingFactor: LoRaSpreadingFactor.sf10,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 14,
      ),
    ),
    (
      'EU/UK (Narrow)',
      RadioSettings(
        frequencyMHz: 869.618,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf8,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 14,
      ),
    ),
    (
      'New Zealand',
      RadioSettings(
        frequencyMHz: 917.375,
        bandwidth: LoRaBandwidth.bw250,
        spreadingFactor: LoRaSpreadingFactor.sf11,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'New Zealand (Narrow)',
      RadioSettings(
        frequencyMHz: 917.375,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf7,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'Portugal 433',
      RadioSettings(
        frequencyMHz: 433.375,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf9,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'Portugal 869',
      RadioSettings(
        frequencyMHz: 869.618,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf7,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 14,
      ),
    ),
    (
      'Switzerland',
      RadioSettings(
        frequencyMHz: 869.618,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf8,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 14,
      ),
    ),
    (
      'USA Arizona',
      RadioSettings(
        frequencyMHz: 908.205,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf10,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'USA/Canada',
      RadioSettings(
        frequencyMHz: 910.525,
        bandwidth: LoRaBandwidth.bw62_5,
        spreadingFactor: LoRaSpreadingFactor.sf7,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'Vietnam',
      RadioSettings(
        frequencyMHz: 920.250,
        bandwidth: LoRaBandwidth.bw250,
        spreadingFactor: LoRaSpreadingFactor.sf11,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    // Off-grid repeat presets (valid client_repeat frequencies)
    (
      'Off-Grid 433',
      RadioSettings(
        frequencyMHz: 433.0,
        bandwidth: LoRaBandwidth.bw250,
        spreadingFactor: LoRaSpreadingFactor.sf11,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
    (
      'Off-Grid 869',
      RadioSettings(
        frequencyMHz: 869.0,
        bandwidth: LoRaBandwidth.bw250,
        spreadingFactor: LoRaSpreadingFactor.sf11,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 14,
      ),
    ),
    (
      'Off-Grid 918',
      RadioSettings(
        frequencyMHz: 918.0,
        bandwidth: LoRaBandwidth.bw250,
        spreadingFactor: LoRaSpreadingFactor.sf11,
        codingRate: LoRaCodingRate.cr4_5,
        txPowerDbm: 20,
      ),
    ),
  ];

  int get frequencyHz => (frequencyMHz * 1000).round();
  int get bandwidthHz => bandwidth.hz;
  int get sf => spreadingFactor.value;
  int get cr => codingRate.value;
}