Print max fee conversion info when using v3 txs (#2797)

<!-- Reference any GitHub issues resolved by this PR -->

Closes #2707 

## Introduced changes

<!-- A brief description of the changes -->

Display info about about conversion when using `--max-fee` flag with v3
transactions

## Checklist

<!-- Make sure all of these are complete -->

- [x] Linked relevant issue
- [x] Updated relevant documentation
- [x] Added relevant tests
- [x] Performed self-review of the code
- [x] Added changes to `CHANGELOG.md`

---------

Co-authored-by: Piotr Figiela <[email protected]>

crates/sncast/src/helpers/fee.rs

@@ -61,6 +61,7 @@ impl FeeArgs {
         }
     }
 
+    #[allow(clippy::too_many_lines)]
     pub async fn try_into_fee_settings<P: Provider>(
         &self,
         provider: P,
@@ -106,6 +107,7 @@ impl FeeArgs {
 
                         let max_gas = NonZeroFelt::try_from(Felt::from(max_fee).floor_div(&max_gas_unit_price))
                         .unwrap_or_else(|_| unreachable!("Calculated max gas must be >= 1 because max_fee >= max_gas_unit_price ensures a positive result"));
+                        print_max_fee_conversion_info(max_fee, max_gas, max_gas_unit_price);
                         FeeSettings::Strk {
                             max_gas: Some(
                                 NonZeroU64::try_from_(max_gas).map_err(anyhow::Error::msg)?,
@@ -123,6 +125,7 @@ impl FeeArgs {
 
                         let max_gas_unit_price = NonZeroFelt::try_from(Felt::from(max_fee).floor_div(&max_gas))
                         .unwrap_or_else(|_| unreachable!("Calculated max gas unit price must be >= 1 because max_fee >= max_gas ensures a positive result"));
+                        print_max_fee_conversion_info(max_fee, max_gas, max_gas_unit_price);
                         FeeSettings::Strk {
                             max_gas: Some(
                                 NonZeroU64::try_from_(max_gas).map_err(anyhow::Error::msg)?,
@@ -144,6 +147,7 @@ impl FeeArgs {
                         // TODO(#2852)
                         let max_gas = NonZeroFelt::try_from(Felt::from(max_fee)
                             .floor_div(&max_gas_unit_price)).context("Calculated max-gas from provided --max-fee and the current network gas price is 0. Please increase --max-fee to obtain a positive gas amount")?;
+                        print_max_fee_conversion_info(max_fee, max_gas, max_gas_unit_price);
                         FeeSettings::Strk {
                             max_gas: Some(
                                 NonZeroU64::try_from_(max_gas).map_err(anyhow::Error::msg)?,
@@ -285,6 +289,19 @@ fn parse_fee_token(s: &str) -> Result<FeeToken, String> {
     Ok(parsed_token)
 }
 
+fn print_max_fee_conversion_info(
+    max_fee: impl Into<Felt>,
+    max_gas: impl Into<Felt>,
+    max_gas_unit_price: impl Into<Felt>,
+) {
+    let max_fee: Felt = max_fee.into();
+    let max_gas: Felt = max_gas.into();
+    let max_gas_unit_price: Felt = max_gas_unit_price.into();
+    println!(
+        "Specifying '--max-fee' flag while using v3 transactions results in conversion to '--max-gas' and '--max-gas-unit-price' flags\nConverted {max_fee} max fee to {max_gas} max gas and {max_gas_unit_price} max gas unit price\n",
+    );
+}
+
 fn parse_non_zero_felt(s: &str) -> Result<NonZeroFelt, String> {
     let felt: Felt = s.parse().map_err(|_| "Failed to parse value")?;
     felt.try_into()

crates/sncast/tests/e2e/account/deploy.rs

@@ -495,6 +495,9 @@ pub async fn test_valid_class_hash() {
     let snapbox = runner(&args).current_dir(tempdir.path());
 
     snapbox.assert().success().stdout_matches(indoc! {r"
+        Specifying '--max-fee' flag while using v3 transactions results in conversion to '--max-gas' and '--max-gas-unit-price' flags
+        Converted [..] max fee to [..] max gas and [..] max gas unit price
+
         command: account deploy
         transaction_hash: [..]
 
@@ -616,6 +619,9 @@ pub async fn test_happy_case_keystore(account_type: &str) {
     let snapbox = runner(&args).current_dir(tempdir.path());
 
     snapbox.assert().stdout_matches(indoc! {r"
+        Specifying '--max-fee' flag while using v3 transactions results in conversion to '--max-gas' and '--max-gas-unit-price' flags
+        Converted [..] max fee to [..] max gas and [..] max gas unit price
+
         command: account deploy
         transaction_hash: 0x0[..]
 
@@ -889,6 +895,9 @@ pub async fn test_deploy_keystore_other_args() {
 
     let snapbox = runner(&args).current_dir(tempdir.path());
     snapbox.assert().stdout_matches(indoc! {r"
+        Specifying '--max-fee' flag while using v3 transactions results in conversion to '--max-gas' and '--max-gas-unit-price' flags
+        Converted [..] max fee to [..] max gas and [..] max gas unit price
+
         command: account deploy
         transaction_hash: 0x0[..]
 

crates/sncast/tests/e2e/invoke.rs

@@ -128,11 +128,19 @@ async fn test_happy_case_strk(class_hash: Felt, account_type: AccountType) {
     ];
 
     let snapbox = runner(&args).current_dir(tempdir.path());
-    let output = snapbox.assert().success().get_output().stdout.clone();
+    let output = snapbox.assert().success();
+    let stdout = output.get_output().stdout.clone();
 
-    let hash = get_transaction_hash(&output);
+    let hash = get_transaction_hash(&stdout);
     let receipt = get_transaction_receipt(hash).await;
 
+    assert_stdout_contains(
+        output,
+        indoc! {
+            "Specifying '--max-fee' flag while using v3 transactions results in conversion to '--max-gas' and '--max-gas-unit-price' flags
+            Converted [..] max fee to [..] max gas and [..] max gas unit price"
+        },
+    );
     assert!(matches!(receipt, Invoke(_)));
 }