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open Protocol
open Alpha_context

let update_metrics ~protocol_metadata (fitness : Tezos_base.Fitness.t)
    update_metrics_callback =
  Alpha_context.Fitness.round_from_raw fitness
  >>?= (fun round ->
         let proto_metrics =
           match
             Data_encoding.Binary.of_bytes_opt
               Protocol.block_header_metadata_encoding
               protocol_metadata
           with
           | None ->
               (* this is the case of the genesis block and the activation block
                  in a sandbox environment *)
               None
           | Some protocol_data ->
               let cycle =
                 Int32.to_float (Cycle.to_int32 protocol_data.level_info.cycle)
               in
               let consumed_gas =
                 Z.to_float
                   (Gas.Arith.integral_to_z
                      (Gas.Arith.ceil protocol_data.consumed_gas))
               in
               Some (cycle, consumed_gas)
         in
         match proto_metrics with
         | Some (cycle, consumed_gas) ->
             return
             @@ update_metrics_callback
                  ~cycle
                  ~consumed_gas
                  ~round:(Int32.to_float (Round.to_int32 round))
         | None -> return_unit)
  >|= Environment.wrap_tzresult
  >>= function
  | _ -> Lwt.return_unit