// Décodeur LoRaWAN officiel : SDI-12 - SDI-12 to LoRaWAN Converter (Dragino)
// Source : https://github.com/TheThingsNetwork/lorawan-devices/blob/master/vendor/dragino/sdi-12.js
// The Things Network Device Repository, fichier publié par le constructeur, distribué sans modification.
// Format : decodeUplink(input) (TTN v3 / ChirpStack v4). Hébergé par smartbuildings.fr.

// Only for AT+DATAUP=0 & AT+ALLDATAMOD=0
function decodeUplink(input) {
  var data = {};
  var port = input.fPort;
  var bytes = input.bytes;
  switch (input.fPort) {
    case 5: {
      var freq_band;
      var sub_band;
      var sensor;

      if (bytes[0] == 0x17) sensor = 'SDI12-LB';
      data.SENSOR_MODEL = sensor;
      var firm_ver = (bytes[1] & 0x0f) + '.' + ((bytes[2] >> 4) & 0x0f) + '.' + (bytes[2] & 0x0f);
      data.FIRMWARE_VERSION = firm_ver;
      if (bytes[3] == 0x01) freq_band = 'EU868';
      else if (bytes[3] == 0x02) freq_band = 'US915';
      else if (bytes[3] == 0x03) freq_band = 'IN865';
      else if (bytes[3] == 0x04) freq_band = 'AU915';
      else if (bytes[3] == 0x05) freq_band = 'KZ865';
      else if (bytes[3] == 0x06) freq_band = 'RU864';
      else if (bytes[3] == 0x07) freq_band = 'AS923';
      else if (bytes[3] == 0x08) freq_band = 'AS923_1';
      else if (bytes[3] == 0x09) freq_band = 'AS923_2';
      else if (bytes[3] == 0x0a) freq_band = 'AS923_3';
      else if (bytes[3] == 0x0f) freq_band = 'AS923_4';
      else if (bytes[3] == 0x0b) freq_band = 'CN470';
      else if (bytes[3] == 0x0c) freq_band = 'EU433';
      else if (bytes[3] == 0x0d) freq_band = 'KR920';
      else if (bytes[3] == 0x0e) freq_band = 'MA869';

      data.FREQUENCY_BAND = freq_band;
      if (bytes[4] == 0xff) data.SUB_BAND = 'NULL';
      else data.SUB_BAND = bytes[4];

      data.bat = ((bytes[5] << 8) | bytes[6]) / 1000;

      return {
        data: data,
      };
      break;
    }
    case 100: {
      for (var j = 0; j < bytes.length; j++) {
        var datas = String.fromCharCode(bytes[j]);
        if (j == '0') data.datas_sum = datas;
        else data.datas_sum += datas;
      }

      return {
        data: data,
      };
      break;
    }

    default: {
      data.EXTI_Trigger = bytes[0] & 0x80 ? 'TRUE' : 'FALSE';
      data.BatV = (((bytes[0] << 8) | bytes[1]) & 0x7fff) / 1000;
      data.Payver = bytes[2];
      for (var i = 3; i < bytes.length; i++) {
        var data1 = String.fromCharCode(bytes[i]);
        if (i == '3') data.data_sum = data1;
        else data.data_sum += data1;
      }
      return {
        data: data,
      };
    }
  }
}