(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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open Alpha_context

module S = struct

  let path = RPC_path.(open_root / "votes")

  let ballots =
    RPC_service.get_service
      ~description:"Sum of ballots casted so far during a voting period."
      ~query: RPC_query.empty
      ~output: Vote.ballots_encoding
      RPC_path.(path / "ballots")

  let ballot_list =
    RPC_service.get_service
      ~description:"Ballots casted so far during a voting period."
      ~query: RPC_query.empty
      ~output: Data_encoding.(list (obj2
                                      (req "pkh" Signature.Public_key_hash.encoding)
                                      (req "ballot" Vote.ballot_encoding)))
      RPC_path.(path / "ballot_list")

  let current_period_kind =
    RPC_service.get_service
      ~description:"Current period kind."
      ~query: RPC_query.empty
      ~output: Voting_period.kind_encoding
      RPC_path.(path / "current_period_kind")

  let current_quorum =
    RPC_service.get_service
      ~description:"Current expected quorum."
      ~query: RPC_query.empty
      ~output: Data_encoding.int32
      RPC_path.(path / "current_quorum")

  let listings =
    RPC_service.get_service
      ~description:"List of delegates with their voting weight, in number of rolls."
      ~query: RPC_query.empty
      ~output: Vote.listings_encoding
      RPC_path.(path / "listings")

  let proposals =
    RPC_service.get_service
      ~description:"List of proposals with number of supporters."
      ~query: RPC_query.empty
      ~output: (Protocol_hash.Map.encoding Data_encoding.int32)
      RPC_path.(path / "proposals")

  let current_proposal =
    RPC_service.get_service
      ~description:"Current proposal under evaluation."
      ~query: RPC_query.empty
      ~output: (Data_encoding.option Protocol_hash.encoding)
      RPC_path.(path / "current_proposal")
end

let register () =
  let open Services_registration in

  register0 S.ballots begin fun ctxt () () ->
    Vote.get_ballots ctxt
  end;

  register0 S.ballot_list begin fun ctxt () () ->
    Vote.get_ballot_list ctxt >|= ok
  end;

  register0 S.current_period_kind begin fun ctxt () () ->
    Vote.get_current_period_kind ctxt
  end;

  register0 S.current_quorum begin fun ctxt () () ->
    Vote.get_current_quorum ctxt
  end;

  register0 S.proposals begin fun ctxt () () ->
    Vote.get_proposals ctxt
  end;

  register0 S.listings begin fun ctxt () () ->
    Vote.get_listings ctxt >|= ok
  end;

  register0 S.current_proposal begin fun ctxt () () ->
    (* this would be better implemented using get_option in get_current_proposal *)
    Vote.get_current_proposal ctxt >>= function
    | Ok p -> return_some p
    | Error (Raw_context.Storage_error (Missing_key _) :: _) -> return_none
    | Error _ as e -> Lwt.return e
  end

let ballots ctxt block =
  RPC_context.make_call0 S.ballots ctxt block () ()

let ballot_list ctxt block =
  RPC_context.make_call0 S.ballot_list ctxt block () ()

let current_period_kind ctxt block =
  RPC_context.make_call0 S.current_period_kind ctxt block () ()

let current_quorum ctxt block =
  RPC_context.make_call0 S.current_quorum ctxt block () ()

let listings ctxt block =
  RPC_context.make_call0 S.listings ctxt block () ()

let proposals ctxt block =
  RPC_context.make_call0 S.proposals ctxt block () ()

let current_proposal ctxt block =
  RPC_context.make_call0 S.current_proposal ctxt block () ()