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open Alpha_context

type rpc_context = {
  block_hash : Block_hash.t;
  block_header : Block_header.shell_header;
  context : Alpha_context.t;
}

let rpc_init ({block_hash; block_header; context} : Updater.rpc_context) =
  let level = block_header.level in
  let timestamp = block_header.timestamp in
  let fitness = block_header.fitness in
  Alpha_context.prepare
    ~level
    ~predecessor_timestamp:timestamp
    ~timestamp
    ~fitness
    context
  >|=? fun (context, _, _) -> {block_hash; block_header; context}

let rpc_services =
  ref (RPC_directory.empty : Updater.rpc_context RPC_directory.t)

let register0_fullctxt s f =
  rpc_services :=
    RPC_directory.register !rpc_services s (fun ctxt q i ->
        rpc_init ctxt >>=? fun ctxt -> f ctxt q i)

let register0 s f = register0_fullctxt s (fun {context; _} -> f context)

let register0_noctxt s f =
  rpc_services := RPC_directory.register !rpc_services s (fun _ q i -> f q i)

let register1_fullctxt s f =
  rpc_services :=
    RPC_directory.register !rpc_services s (fun (ctxt, arg) q i ->
        rpc_init ctxt >>=? fun ctxt -> f ctxt arg q i)

let register1 s f = register1_fullctxt s (fun {context; _} x -> f context x)

let register2_fullctxt s f =
  rpc_services :=
    RPC_directory.register !rpc_services s (fun ((ctxt, arg1), arg2) q i ->
        rpc_init ctxt >>=? fun ctxt -> f ctxt arg1 arg2 q i)

let register2 s f =
  register2_fullctxt s (fun {context; _} a1 a2 q i -> f context a1 a2 q i)

let opt_register0_fullctxt s f =
  rpc_services :=
    RPC_directory.opt_register !rpc_services s (fun ctxt q i ->
        rpc_init ctxt >>=? fun ctxt -> f ctxt q i)

let opt_register0 s f =
  opt_register0_fullctxt s (fun {context; _} -> f context)

let opt_register1_fullctxt s f =
  rpc_services :=
    RPC_directory.opt_register !rpc_services s (fun (ctxt, arg) q i ->
        rpc_init ctxt >>=? fun ctxt -> f ctxt arg q i)

let opt_register1 s f =
  opt_register1_fullctxt s (fun {context; _} x -> f context x)

let opt_register2_fullctxt s f =
  rpc_services :=
    RPC_directory.opt_register !rpc_services s (fun ((ctxt, arg1), arg2) q i ->
        rpc_init ctxt >>=? fun ctxt -> f ctxt arg1 arg2 q i)

let opt_register2 s f =
  opt_register2_fullctxt s (fun {context; _} a1 a2 q i -> f context a1 a2 q i)

let get_rpc_services () =
  let p =
    RPC_directory.map
      (fun c ->
        rpc_init c >|= function Error _ -> assert false | Ok c -> c.context)
      (Storage_description.build_directory Alpha_context.description)
  in
  RPC_directory.register_dynamic_directory
    !rpc_services
    RPC_path.(open_root / "context" / "raw" / "json")
    (fun _ -> Lwt.return p)