NFC: Plaintain parser fix

by mxcdoam
https://github.com/flipperdevices/flipperzero-firmware/pull/3975/files

applications/main/nfc/plugins/supported_cards/plantain.c

@@ -201,8 +201,9 @@ static bool plantain_read(Nfc* nfc, NfcDevice* device) {
 
 static bool plantain_parse(const NfcDevice* device, FuriString* parsed_data) {
     furi_assert(device);
-
+    size_t uid_len = 0;
     const MfClassicData* data = nfc_device_get_data(device, NfcProtocolMfClassic);
+    const uint8_t* uid = mf_classic_get_uid(data, &uid_len);
 
     bool parsed = false;
 
@@ -220,12 +221,30 @@ static bool plantain_parse(const NfcDevice* device, FuriString* parsed_data) {
         if(key != cfg.keys[cfg.data_sector].a) break;
 
         furi_string_printf(parsed_data, "\e#Plantain card\n");
+
+        const uint8_t* temp_ptr = &uid[0];
+
+        // UID is read from last to first byte
+        uint8_t card_number_tmp[uid_len];
+
+        if(uid_len == 4) {
+            for(size_t i = 0; i < 4; i++) {
+                card_number_tmp[i] = temp_ptr[3 - i];
+            }
+        } else if(uid_len == 7) {
+            for(size_t i = 0; i < 7; i++) {
+                card_number_tmp[i] = temp_ptr[6 - i];
+            }
+        } else {
+            break;
+        }
+        //UID is converted to a card number
         uint64_t card_number = 0;
-        for(size_t i = 0; i < 7; i++) {
+        for(size_t i = 0; i < uid_len; i++) {
-            card_number = (card_number << 8) | data->block[0].data[6 - i];
+            card_number = (card_number << 8) | card_number_tmp[i];
         }
 
-        // Print card number with 4-digit groups
+        // Print card number with 4-digit groups. "3" in "3078" denotes a ticket type "3 - full ticket", will differ on discounted cards.
         furi_string_cat_printf(parsed_data, "Number: ");
         FuriString* card_number_s = furi_string_alloc();
         furi_string_cat_printf(card_number_s, "%llu", card_number);
@@ -237,6 +256,7 @@ static bool plantain_parse(const NfcDevice* device, FuriString* parsed_data) {
             furi_string_push_back(tmp_s, ' ');
         }
         furi_string_cat_printf(parsed_data, "%s\n", furi_string_get_cstr(tmp_s));
+        // this works for 2K Plantain
         if(data->type == MfClassicType1k) {
             //balance
             uint32_t balance = 0;
@@ -290,20 +310,70 @@ static bool plantain_parse(const NfcDevice* device, FuriString* parsed_data) {
                 last_payment_date.year,
                 last_payment_date.hour,
                 last_payment_date.minute);
-            //payment summ
+            //payment amount. This needs to be investigated more, currently it shows incorrect amount on some cards.
             uint16_t last_payment = (data->block[18].data[9] << 8) | data->block[18].data[8];
             furi_string_cat_printf(parsed_data, "Amount: %d rub", last_payment / 100);
             furi_string_free(card_number_s);
             furi_string_free(tmp_s);
+            //This is for 4K Plantains.
         } else if(data->type == MfClassicType4k) {
+            //balance
+            uint32_t balance = 0;
+            for(uint8_t i = 0; i < 4; i++) {
+                balance = (balance << 8) | data->block[16].data[3 - i];
+            }
+            furi_string_cat_printf(parsed_data, "Balance: %ld rub\n", balance / 100);
+
             //trips
-            uint8_t trips_metro = data->block[36].data[0];
+            uint8_t trips_metro = data->block[21].data[0];
-            uint8_t trips_ground = data->block[36].data[1];
+            uint8_t trips_ground = data->block[21].data[1];
             furi_string_cat_printf(parsed_data, "Trips: %d\n", trips_metro + trips_ground);
+            //trip time
+            uint32_t last_trip_timestamp = 0;
+            for(uint8_t i = 0; i < 3; i++) {
+                last_trip_timestamp = (last_trip_timestamp << 8) | data->block[21].data[4 - i];
+            }
+            DateTime last_trip = {0};
+            from_minutes_to_datetime(last_trip_timestamp + 24 * 60, &last_trip, 2010);
+            furi_string_cat_printf(
+                parsed_data,
+                "Trip start: %02d.%02d.%04d %02d:%02d\n",
+                last_trip.day,
+                last_trip.month,
+                last_trip.year,
+                last_trip.hour,
+                last_trip.minute);
+            //validator
+            uint16_t validator = (data->block[20].data[5] << 8) | data->block[20].data[4];
+            furi_string_cat_printf(parsed_data, "Validator: %d\n", validator);
+            //tariff
+            uint16_t fare = (data->block[20].data[7] << 8) | data->block[20].data[6];
+            furi_string_cat_printf(parsed_data, "Tariff: %d rub\n", fare / 100);
             //trips in metro
             furi_string_cat_printf(parsed_data, "Trips (Metro): %d\n", trips_metro);
             //trips on ground
             furi_string_cat_printf(parsed_data, "Trips (Ground): %d\n", trips_ground);
+            //last payment
+            uint32_t last_payment_timestamp = 0;
+            for(uint8_t i = 0; i < 3; i++) {
+                last_payment_timestamp = (last_payment_timestamp << 8) |
+                                         data->block[18].data[4 - i];
+            }
+            DateTime last_payment_date = {0};
+            from_minutes_to_datetime(last_payment_timestamp + 24 * 60, &last_payment_date, 2010);
+            furi_string_cat_printf(
+                parsed_data,
+                "Last pay: %02d.%02d.%04d %02d:%02d\n",
+                last_payment_date.day,
+                last_payment_date.month,
+                last_payment_date.year,
+                last_payment_date.hour,
+                last_payment_date.minute);
+            //payment amount
+            uint16_t last_payment = (data->block[18].data[9] << 8) | data->block[18].data[8];
+            furi_string_cat_printf(parsed_data, "Amount: %d rub", last_payment / 100);
+            furi_string_free(card_number_s);
+            furi_string_free(tmp_s);
         }
         parsed = true;
     } while(false);