syntax = "proto3";

package neo.fs.v2.accounting;

option go_package = "github.com/nspcc-dev/neofs-api-go/v2/accounting/grpc;accounting";
option csharp_namespace = "NeoFS.API.v2.Accounting";

import "accounting/types.proto";
import "refs/types.proto";
import "service/types.proto";

// The service provides methods for obtaining information
// about the account balance in NeoFS system.
service AccountingService {
  // Returns the amount of funds for the requested NeoFS account.
  rpc Balance (BalanceRequest) returns (BalanceResponse);
}

// Message defines the request body of Balance method.
//
// To indicate the account for which the balance is requested, it's identifier
// is used.
//
// To gain access to the requested information, the request body must be formed
// according to the requirements from the system specification.
message BalanceRequest {
  //Request body
  message Body {
    // Carries user identifier in NeoFS system for which the balance
    // is requested.
    neo.fs.v2.refs.OwnerID owner_id = 1;
  }
  // Body of the balance request message.
  Body body = 1;

  // Carries request meta information. Header data is used only to regulate
  // message transport and does not affect request execution.
  neo.fs.v2.service.RequestMetaHeader meta_header = 2;

  // Carries request verification information. This header is used to
  // authenticate the nodes of the message route and check the correctness
  // of transmission.
  neo.fs.v2.service.RequestVerificationHeader verify_header = 3;
}

// Message defines the response body of Balance method.
//
// The amount of funds is calculated in decimal numbers.
message BalanceResponse {
  //Request body
  message Body {
    // Carries the amount of funds on the account.
    Decimal balance = 1;
  }
  // Body of the balance response message.
  Body body = 1;

  // Carries response meta information. Header data is used only to regulate
  // message transport and does not affect request execution.
  neo.fs.v2.service.ResponseMetaHeader meta_header = 2;

  // Carries response verification information. This header is used to
  // authenticate the nodes of the message route and check the correctness
  // of transmission.
  neo.fs.v2.service.ResponseVerificationHeader verify_header = 3;
}