chore: Conway era script data hash changes

Author: satran004

function/src/main/java/com/bloxbean/cardano/client/function/helper/ScriptDataHashCalculator.java

@@ -60,12 +60,14 @@ public static void calculateScriptDataHash(TxBuilderContext ctx, Transaction tra
                 costMdls.add(costModel.orElse(PlutusV3CostModel));
             }
 
-            if (costMdls.isEmpty()) { //Check if costmodel can be decided from other fields //TODO Impl : Check what to do for v3 reference scripts
-                if (transaction.getBody().getReferenceInputs() != null
-                        && transaction.getBody().getReferenceInputs().size() > 0) { //If reference input is there, then plutus v2
-                    var refInputLanguage = ctx.getReferenceInputLanguage();
-                    Optional<CostModel> costModel = CostModelUtil.getCostModelFromProtocolParams(ctx.getProtocolParams(), refInputLanguage);
-                    costMdls.add(costModel.orElse(PlutusV2CostModel));
+            if (transaction.getBody().getReferenceInputs() != null
+                    && transaction.getBody().getReferenceInputs().size() > 0) { //If reference input is there, the check the language from that
+                if (!ctx.getRefScriptLanguages().isEmpty()) {
+                    for (Language language : ctx.getRefScriptLanguages()) {
+                        Optional<CostModel> costModel =
+                                CostModelUtil.getCostModelFromProtocolParams(ctx.getProtocolParams(), language);
+                        costMdls.add(costModel.orElseThrow(() -> new IllegalArgumentException("Cost model not found for language : " + language)));
+                    }
                 }
             }
         }

plutus/src/main/java/com/bloxbean/cardano/client/plutus/util/ScriptDataHashGenerator.java

@@ -64,13 +64,17 @@ public static byte[] generate(List<Redeemer> redeemers, List<PlutusData> datums,
 
             encodedBytes = Bytes.concat(redeemerBytes, plutusDataBytes, langViewsBytes);
         } else {
-            /**
-             ; Finally, note that in the case that a transaction includes datums but does not
-             ; include any redeemers, the script data format becomes (in hex):
-             ; [ 80 | datums | A0 ]
-             ; corresponding to a CBOR empty list and an empty map.
-             **/
-            encodedBytes = Bytes.concat(HexUtil.decodeHexString("0x80"), plutusDataBytes, HexUtil.decodeHexString("0xA0"));
+            if (EraSerializationConfig.INSTANCE.useConwayEraFormat()) {
+                encodedBytes = Bytes.concat(HexUtil.decodeHexString("0xA0"), plutusDataBytes, langViewsBytes);
+            } else { //Pre conway era
+                /**
+                 ; Finally, note that in the case that a transaction includes datums but does not
+                 ; include any redeemers, the script data format becomes (in hex):
+                 ; [ 80 | datums | A0 ]
+                 ; corresponding to a CBOR empty list and an empty map.
+                 **/
+                encodedBytes = Bytes.concat(HexUtil.decodeHexString("0x80"), plutusDataBytes, HexUtil.decodeHexString("0xA0"));
+            }
         }
 
         return Blake2bUtil.blake2bHash256(encodedBytes);