/**
 * This is a definition of the types that come with the input
 *
 * @typedef {object} ScriptInput
 * @property {Metadata} metadata
 * @property {string} encoding
 * @property {object} payload - type is the same as the input encoding
 *
 * Metadata
 * @typedef {object} Metadata
 * @property {Device} device
 * @property {Ingestion} ingestion
 *
 * Device
 * @typedef {object} Device
 * @property {string} name
 * @property {string} [barcode]
 *
 * Ingestion
 * @typedef {object} Ingestion
 * @property {string} timestamp - ISO 8601 timestamp string
 * @property {ActilityIngestionMetadata} [actility] - Lora / Actility specific data
 *
 * ActilityIngestionMetadata
 * @typedef {object} ActilityIngestionMetadata
 * @property {LocalGateway[]} gateways - matching Local Gateways or empty if none are provided
 * @property {ActilityLocation} [location] - associated Actility location if available or a falsy value if not.
 * @property {ActilityUplink} [uplink] - associated Actility uplink if available or a falsy value if not.
 *
 * LocalGateway
 * @typedef {object} LocalGateway
 * @property {string} lrrId - ID of the gateway (LRR)
 * @property {string} locationDescription - free-form location description assigned to the gateway
 *
 * See https://oss-api.thingpark.com/tpe/7.1/Core-Network/lrc-as-tunnel-lorawan/documentation-tunnel-lrc-to-as-lorawan.html
 * @typedef {object} ActilityLocation
 * @property {string} CustomerID - Customer ID associated with the Device Manager account.
 * @property {string} DevAddr - Device DevAddr (Pattern: ^[0-9A-F]{8}$).
 * @property {string} DevEUI - Device DevEUI in lower case hexadecimal ASCII format (Pattern: ^[0-9a-f]{16}$).
 * @property {string} DevLocTime - Last geolocation timestamp (date-time).
 * @property {number} DevLAT - Last geolocation latitude (GPS coordinate system).
 * @property {number} DevLON - Last geolocation longitude (GPS coordinate system).
 * @property {number} DevAlt - Last geolocation altitude (meter).
 * @property {number} DevLocRadius - Last geolocation horizontal tolerance (meter).
 * @property {number} DevAltRadius - Last geolocation vertical tolerance (meter).
 * @property {number} DevNorthVel - Velocity (NORTH axis) expressed in m/s.
 * @property {number} DevEastVel - Velocity (EAST axis) expressed in m/s.
 * @property {number} DevLocDilution - Horizontal DOP (dilution of precision) calculated for given mutual position of gateways, used for solution calculation, and device.
 * @property {number} DevAltDilution - Vertical DOP (dilution of precision) calculated for given mutual position of gateways, used for solution calculation, and device.
 * @property {number} DevUlFCntUpUsed - The uplink counter used for this location resolution (Interval: [0, 4294967295]).
 * @property {string} Lrcid - ID of the LRC sending the report (Pattern: ^[0-9A-F]{8}$).
 * @property {string} ModelCfg - ThingPark X configuration set by provisioning.
 * @property {number} NwGeolocAlgo - Network geolocation algorithm configured for the device (Interval: [0, 2]):
 *   - 0: Time Difference Of Arrival (TDOA)
 *   - 1: Received Signal Strength Indicator (RSSI)
 *   - 2: Both (TDOA and RSSI)
 * @property {number} NwGeolocAlgoUsed - Network geolocation algorithm used by the geolocation solver (Interval: [0, 1]):
 *   - 0: Time Difference Of Arrival (TDOA)
 *   - 1: Received Signal Strength Indicator (RSSI)
 * @property {string} Time - LRC Timestamp for the geolocation.
 * @property {CustomerData} CustomerData - Customer data set by provisioning.
 *
 * See https://oss-api.thingpark.com/tpe/7.1/Core-Network/lrc-as-tunnel-lorawan/documentation-tunnel-lrc-to-as-lorawan.html
 * @typedef {object} ActilityUplink
 * @property {number} ACKbit - ACKBit set by the device. ACKbit is not filled in the document if not set in the uplink frame.
 * @property {number} ADRbit - ADRBit set by the device. ADRbit is not filled in the document if not set in the uplink frame.
 * @property {number} AFCntDn - The applicative downlink counter to be used for the next downlink frame. See FCntDn field for reporting rules. Only applicable to LoRaWAN® 1.1 when the FPort > 0.
 * @property {string} AppSKey - Encrypted AppSkey with the AS transport key. AppSKey is not filled in the document if end-to-end encryption is not used.
 * @property {string} AppSKeyEKLabel - Label of the AS transport key used to encrypt the AppSKey.
 * @property {number} BatteryLevel - Battery level reported by the ReportDevStatus. BatteryLevel is only filled if the Connectivity Plan ReportDevStatusBattery feature flag is activated. When activated, the battery level is only reported periodically, according to the Connectivity Plan DevStatusReqFreq setting.
 * @property {string} BatteryTime - Battery level reporting timestamp (ISO 8601). BatteryTime is only filled if the Connectivity Plan ReportDevStatusBattery feature flag is activated. When activated, the battery level is only reported periodically, according to the Connectivity Plan DevStatusReqFreq setting.
 * @property {string} Channel - LC ID of the radio channel used to transmit the frame. This field is not relevant when Lrrid is set to 00000000.
 * @property {number} ClassBPeriodicity - Class B periodicity in seconds requested by the device. Only applicable to Class B.
 * @property {number} ConfAFCntDn - The applicative downlink counter CONFIRMED by the device for this packet. Only applicable to LoRaWAN® 1.1 when the uplink frame acknowledges a previous downlink frame.
 * @property {string} CustomerID - Customer ID associated with the Device Manager account.
 * @property {string} DevAddr - Device DevAddr.
 * @property {string} DevEUI - Device DevEUI in upper case hexadecimal ASCII format.
 * @property {number} DevLrrCnt - Number of LRRs which received this packet.
 * @property {string} DevLocTime - Last geolocation timestamp. Only filled if the Connectivity Plan NwGeolocation feature flag is activated and a geolocation has been resolved based on previous uplink frames.
 * @property {number} DevLAT - Last geolocation latitude (GPS coordinate system). Only filled if the Connectivity Plan NwGeolocation feature flag is activated and a geolocation has been resolved based on previous uplink frames.
 * @property {number} DevLON - Last geolocation longitude (GPS coordinate system). Only filled if the Connectivity Plan NwGeolocation feature flag is activated and a geolocation has been resolved based on previous uplink frames.
 * @property {number} DevAlt - Last geolocation altitude (meter). Only filled if the Connectivity Plan NwGeolocation feature flag is activated, a geolocation has been resolved based on previous uplink frames, and this information is available in the geolocation resolution output.
 * @property {number} DevLocRadius - Last geolocation horizontal tolerance (meter). Only filled if the Connectivity Plan NwGeolocation feature flag is activated, a geolocation has been resolved based on previous uplink frames, and this information is available in the geolocation resolution output.
 * @property {number} DevAltRadius - Last geolocation vertical tolerance (meter). Only filled if the Connectivity Plan NwGeolocation feature flag is activated, a geolocation has been resolved based on previous uplink frames, and this information is available in the geolocation resolution output.
 * @property {number} DevNorthVel - Velocity (NORTH axis) expressed in m/s. Only filled if the Connectivity Plan NwGeolocation feature flag is activated, a geolocation has been resolved based on previous uplink frames, and this information is available in the geolocation resolution output.
 * @property {number} DevEastVel - Velocity (EAST axis) expressed in m/s. Only filled if the Connectivity Plan NwGeolocation feature flag is activated, a geolocation has been resolved based on previous uplink frames, and this information is available in the geolocation resolution output.
 * @property {number} DevLocDilution - Horizontal DOP (dilution of precision) calculated for the given mutual position of gateways, used for solution calculation, and device. Only filled if the Connectivity Plan NwGeolocation feature flag is activated, a geolocation has been resolved based on previous uplink frames, and this information is available in the geolocation resolution output.
 * @property {number} DevAltDilution - Vertical DOP (dilution of precision) calculated for the given mutual position of gateways, used for solution calculation, and device. Only filled if the Connectivity Plan NwGeolocation feature flag is activated, a geolocation has been resolved based on previous uplink frames, and this information is available in the geolocation resolution output.
 * @property {number} DevUlFCntUpUsed - The FCntUp used for this location resolution. Only filled if the Connectivity Plan NwGeolocation feature flag is activated, a geolocation has been resolved based on previous uplink frames, and this information is available in the geolocation resolution output.
 * @property {string} DynamicClass - LoRaWAN® class currently used by the Device: 'A', 'B' or 'C'.
 * @property {number} FCntDn - The downlink counter to be used for the next downlink frame. Only applicable to LoRaWAN® 1.0.
 * @property {number} FCntUp - The uplink counter for this packet.
 * @property {string} ForwardingNetID - The NetID of the forwarding NS, when a third-party roaming fNS was used to route the packet.
 * @property {string} ForwardingNSID - The NSID of the forwarding NS, when a third-party roaming fNS was used to route the packet using LoRaWAN® BE 1.1.
 * @property {number} FPort - LoRaWAN® FPort used by the device for this packet. Only set if present in the uplink packet.
 * @property {number} Frequency - Frequency in MHz of the radio channel used to transmit the frame. This field is not relevant when Lrrid is set to 00000000.
 * @property {number} InstantPER - Instantaneous PER (Packet Error Rate). InstantPER is only filled if the Connectivity Plan AddPERInfo feature flag is activated. The instantaneous PER is computed over the 2 last distinct uplink frames.
 * @property {number} Late - Indicates if the packet was queued by the LRR. Late is always filled. 0 means that the packet was not queued by the LRR, 1 means that the packet was queued.
 * @property {string} Lrcid - ID of the LRC sending the report
 * @property {number} LrrESP - ESP measured by the best LRR
 * @property {string} Lrrid - The ID of the LRR that received the packet with the best SNR. This LRR is flagged as "best LRR".
 * @property {number} LrrLAT - Latitude of the best LRR. LrrLAT is only filled if the Connectivity Plan AddLrrMetaInfo feature flag is activated.
 * @property {number} LrrLON - Longitude of the best LRR. LrrLON is only filled if the Connectivity Plan AddLrrMetaInfo feature flag is activated.
 * @property {number} LrrRSSI - RSSI measured by the best LRR
 * @property {number} LrrSNR - SNR measured by the best LRR
 * @property {{Lrr: Lrr[]}} Lrrs - The list of LRRs which reported the packet before the expiration of the 250 ms deduplication window. If the packet was reported by more than 10 LRRs before the expiration of the 250 ms deduplication window, only the 10 LRRs with the best SNR are reported. Only filled if the Connectivity Plan AddLrrMetaInfo feature flag is activated.
 * @property {number} Margin - Margin reported by the ReportDevStatus. Margin is only filled if the Connectivity Plan ReportDevStatusMargin feature flag is activated. When activated, the margin is only reported periodically, according to the Connectivity Plan DevStatusReqFreq setting.
 * @property {number} MeanPER - Mean PER (Packet Error Rate). MeanPER is only filled if the Connectivity Plan AddPERInfo feature flag is activated.
 * @property {string} mic_hex - MIC in hexadecimal ASCII format
 * @property {string} ModelCfg - ThingPark X configuration set by provisioning
 * @property {number} MType - LoRaWAN® MType of the packet
 * @property {number} NbTrans - The number of transmissions for each uplink message requested by the LRC, according to ADR algorithm and validated by the device through a LinkADRAns MAC command. If no LinkADRAns have been yet validated by the device, NbTrans = 1.
 * @property {number} NwGeolocAlgo - Network geolocation algorithm configured for the device
 * @property {number} NwGeolocAlgoUsed - Network geolocation algorithm used by the geolocation solver
 * @property {string} payload_hex - LoRaWAN® payload in hexadecimal ASCII format. The payload is not reported if it is smaller than or equal to the DummyPayloadMaxSize value configured in the Device Profile.
 * @property {number} Roaming - Indicates the type of roaming, when a third-party roaming fNS was used to route the packet.
 * @property {number} SpFact - SF used by the device
 * @property {string} SubBand - Sub-band of the radio channel used to transmit the frame. This field is not relevant when Lrrid is set to 00000000.
 * @property {string} Time - LRR Timestamp for the packet
 * @property {number} TxPower - The transmission power of the device (in dBm), computed by the LRC based on ADR algorithm and validated by the device through a LinkADRAns. If no LinkADRAns have been yet validated by the device, the device boot parameter is used instead.
 * @property {number} deviceUplinkDC - The aggregate occupancy rate of the RF logical channel associated with this uplink frame, as estimated at the time of reception. deviceUplinkDC is only filled if the Connectivity Plan AddUplinkDCInfo feature flag is activated.
 * @property {number} deviceUplinkDCSubBand - The aggregate occupancy rate of the RF sub-band associated with this uplink frame, as estimated at the time of reception. deviceUplinkDCSubBand is only filled if the Connectivity Plan AddUplinkDCInfo feature flag is activated.
 * @property {BaseStationData} BaseStationData - Base Station properties set by provisioning. Only reported for the best LRR when it belongs to the device's owner.
 * @property {CustomerData} CustomerData - Customer data set by provisioning
 * @property {DriverCfg} DriverCfg - Metadata for Driver selection
 * @typedef {object} Lrr
 * @property {number} Interval - The interval within the range [1, 10].
 * @property {number} Chain - The LRR antenna chain used to receive the packet (integer within the range of int32).
 * @property {string} Lrrid - LRR ID associated to this field (Pattern: ^[0-9A-F]{8}$).
 * @property {number} LrrESP - ESP measured by the LRR associated with this field element (Multiple of: 0.000001).
 * @property {number} LrrRSSI - RSSI measured by the LRR associated with this field (Multiple of: 0.000001).
 * @property {number} LrrSNR - SNR measured by the LRR associated with this field (Multiple of: 0.000001).
 * @property {string} ForwardingNetID - The NetID of the forwarding NS when a third-party roaming fNS was used to route the packet (Pattern: ^[0-9A-F]{6}$).
 * @property {string} ForwardingNSID - The NSID of the forwarding NS when a third-party roaming fNS was used to route the packet using LoRaWAN® BE 1.1 (Pattern: ^[0-9A-F]{16}$).
 * @typedef {object} BaseStationData
 * @property {Array} doms - An array of domain information.
 * @property {string} doms.n - Domain name (string).
 * @property {string} doms.g - Domain group name (string).
 * @property {string} name - Base station name (string).
 * @typedef {object} CustomerData
 * @property {object} loc - Administrative device location.
 * @property {string} loc.lat - Device latitude (string).
 * @property {string} loc.lon - Device longitude (string).
 * @property {object} alr - Device application layer.
 * @property {string} alr.pro - Product (string).
 * @property {string} alr.ver - Version (string).
 * @property {Array} tags - An array of tags associated with the device (string).
 * @property {Array} doms - An array of domain information.
 * @property {string} doms.n - Domain name (string).
 * @property {string} doms.g - Domain group name (string).
 * @property {string} name - Device name (string).
 * @typedef {object} DriverCfg
 * Metadata for Driver selection.
 * @property {object} mod - Device model metadata.
 * @property {string} mod.pId - Producer identifier (string).
 * @property {string} mod.mId - Module identifier (string).
 * @property {string} mod.ver - Version (string).
 * @property {object} app - Device protocol metadata.
 * @property {string} app.pId - Producer identifier (string).
 * @property {string} app.mId - Module identifier (string).
 * @property {string} app.ver - Version (string).
 */

stringInput => {
  const { encoding, payload, metadata } = JSON.parse(stringInput);

  const senMLPack = [];          

  // Example code for creating SenML based on actility ingestion data  
  const { uplink, location } = metadata.ingestion.actility;
  if (uplink) {
      senMLPack.push({
          n: 'payload_hex',
          vs: uplink.payload_hex,
      });
      senMLPack.push({
        n: 'FCntUp',
        v: uplink.FCntUp,
      });
  }

  if (location) {
    if (location.DevLAT != null) {
      senMLPack.push({
        n: 'latitude',
        u: 'lat',
        v: location.DevLAT,
      });
    }
    if (location.DevLON != null) {
      senMLPack.push({
        n: 'longitude',
        u: 'lon',
        v: location.DevLON,
      });
    }
  }

  // First SenML entry MUST contain the base name and optionaly the base time.
  if (senMLPack.length > 0) {
    // bn SHOULD be filled with the network URN
    // The URN can be constructed using the DevEUI from the Actility data
    const devEui = (uplink ?? location).DevEUI;
    senMLPack[0].bn = `urn:dev:DEVEUI:${devEui}:`;
    // bt is in epoch seconds, but can contain fraction
    senMLPack[0].bt = Date.parse(metadata.ingestion.timestamp) / 1000.0;
  }
  
  // Make sure you stringify the SenML pack
  return JSON.stringify(senMLPack);
};