open Types

(* TODO
   - take secmod devices as param
   - time stuff
   - hash stuff
     what is the hash algorithm
     is it hash'ed then base32'ed in xxxP?
   ... *)

let mk_denomination_key rsa_pub =
  DenominationKey.Rsa RsaDenominationKey.{ age_mask= 0; rsa_pub }

let mk_future_denom denom_secmod_sign_f
    ({
       section_name;
       value;
       stamp_start;
       stamp_expire_withdraw;
       stamp_expire_deposit;
       stamp_expire_legal;
       fee_withdraw;
       fee_deposit;
       fee_refresh;
       fee_refund;
       pub;
       sign= _;
     } :
      Secmod_denom.rsa_denom) =
  let denom_pub = mk_denomination_key pub in
  let denom_secmod_sig =
    let open Binary_formats in
    let h_denom_pub =
      (* TODO hash *)
      let v = pub |> Types.RsaPublicKey.to_b32 in
      DenominationHash.{ v= { v } }
    in
    let h_section_name =
      (* TODO hash *)
      let v = section_name in
      HashCode.{ v }
    in
    let anchor_time =
      TimeAbsoluteNBO.{ v= Util.ptime_to_int64_us stamp_start }
    in
    let duration_withdraw =
      let v =
        Ptime.diff stamp_start stamp_expire_withdraw
        |> Util.ptime_of_span_exn
        |> Util.ptime_to_int64_us
      in
      TimeRelativeNBO.{ v }
    in
    let ps =
      DenominationKeyAnnouncementPS.
        { h_denom_pub; h_section_name; anchor_time; duration_withdraw }
    in
    ps |> Bin.to_string DenominationKeyAnnouncementPS.bin |> denom_secmod_sign_f
  in
  FutureDenom.
    {
      section_name;
      value;
      stamp_start= Timestamp.of_ptime stamp_start;
      stamp_expire_withdraw= Timestamp.of_ptime stamp_expire_withdraw;
      stamp_expire_deposit= Timestamp.of_ptime stamp_expire_deposit;
      stamp_expire_legal= Timestamp.of_ptime stamp_expire_legal;
      denom_pub;
      fee_withdraw;
      fee_deposit;
      fee_refresh;
      fee_refund;
      denom_secmod_sig;
    }

let mk_future_sign_key signkey_secmod_sign_f
    ({ pub; sign= _; stamp_start; stamp_expire; stamp_end } : Secmod_keys.t) =
  let exchange_pub =
    Binary_formats.ExchangePublicKeyP.{ v= { v= EddsaPublicKey.to_octets pub } }
  in
  let signkey_secmod_sig =
    let open Binary_formats in
    let ps =
      let anchor_time =
        TimeAbsoluteNBO.{ v= Util.ptime_to_int64_us stamp_start }
      in
      let duration =
        let v =
          Ptime.diff stamp_start stamp_expire
          |> Util.ptime_of_span_exn
          |> Util.ptime_to_int64_us
        in
        TimeRelativeNBO.{ v }
      in
      SigningKeyAnnouncementPS.{ exchange_pub; anchor_time; duration }
    in
    ps |> Bin.to_string SigningKeyAnnouncementPS.bin |> signkey_secmod_sign_f
  in
  FutureSignKey.
    {
      key= pub;
      stamp_start= Timestamp.of_ptime stamp_start;
      stamp_expire= Timestamp.of_ptime stamp_expire;
      stamp_end= Timestamp.of_ptime stamp_end;
      signkey_secmod_sig;
    }

let keys req _server _env =
  let open Vif.Response in
  let open Syntax in
  let* () = with_string req "keys .. \n" in
  let* () = add ~field:"content-type" "application/json" in
  respond `OK