Add mana calculations (#1376)

* Add Mana decay computation

* fix up the mana decay fn

* add potential mana calculation

* refactor

* rename

* make epoch/slot conversion simple

* cleanup

* impl Into

* clippy

* Add tests

* revert functionality and comment out tests that cannot pass

* revert to non-wrapping lower_n_bits

* okay one more check

---------

Co-authored-by: Thibault Martinez <[email protected]>

sdk/src/client/api/block_builder/mod.rs

@@ -50,7 +50,7 @@ impl ClientInner {
 
         let protocol_params = self.get_protocol_parameters().await?;
 
-        Ok(BlockWrapper::build(
+        BlockWrapper::build(
             BlockHeader::new(
                 protocol_params.version(),
                 protocol_params.network_id(),
@@ -66,6 +66,6 @@ impl ClientInner {
                 .finish_block()?,
         )
         .sign_ed25519(secret_manager, chain)
-        .await?)
+        .await
     }
 }

sdk/src/types/block/error.rs

@@ -173,6 +173,10 @@ pub enum Error {
     DuplicateOutputChain(ChainId),
     InvalidField(&'static str),
     NullDelegationValidatorId,
+    InvalidEpochDelta {
+        created: EpochIndex,
+        target: EpochIndex,
+    },
 }
 
 #[cfg(feature = "std")]
@@ -375,6 +379,9 @@ impl fmt::Display for Error {
             Self::DuplicateOutputChain(chain_id) => write!(f, "duplicate output chain {chain_id}"),
             Self::InvalidField(field) => write!(f, "invalid field: {field}"),
             Self::NullDelegationValidatorId => write!(f, "null delegation validator ID"),
+            Self::InvalidEpochDelta { created, target } => {
+                write!(f, "invalid epoch delta: created {created}, target {target}")
+            }
         }
     }
 }