syntax = "proto3";

package usage.v1;

option go_package = "github.com/gitpod-io/gitpod/usage-api/v1";

import "google/protobuf/timestamp.proto";

service BillingService {
  // ReconcileInvoices retrieves current credit balance and reflects it in billing system.
  // Internal RPC, not intended for general consumption.
  rpc ReconcileInvoices(ReconcileInvoicesRequest) returns (ReconcileInvoicesResponse) {};

  // GetUpcomingInvoice retrieves the latest invoice for a given query.
  rpc GetUpcomingInvoice(GetUpcomingInvoiceRequest) returns (GetUpcomingInvoiceResponse) {};

  // FinalizeInvoice marks all sessions occurring in the given Stripe invoice as
  // having been invoiced.
  rpc FinalizeInvoice(FinalizeInvoiceRequest) returns (FinalizeInvoiceResponse) {};

  // SetBilledSession marks an instance as billed with a billing system
  rpc SetBilledSession(SetBilledSessionRequest) returns (SetBilledSessionResponse) {};
}

message ReconcileInvoicesRequest {}

message ReconcileInvoicesResponse {}

message GetUpcomingInvoiceRequest {
  oneof identifier {
    string team_id = 1;
    string user_id = 2;
  }
}

message GetUpcomingInvoiceResponse {
  string invoice_id = 1;
  string currency = 2;
  double amount = 3;
  int64  credits = 4;
}

message FinalizeInvoiceRequest {
  string invoice_id = 1;
}

message FinalizeInvoiceResponse {
}

enum System {
  SYSTEM_UNKNOWN = 0;
  SYSTEM_CHARGEBEE = 1;
  SYSTEM_STRIPE = 2;
}

// If there are two billable sessions for this instance ID,
// the second one's "from" will be the first one's "to"
message SetBilledSessionRequest {
  string instance_id = 1;
  google.protobuf.Timestamp from = 2;
  System system = 3;
}

message SetBilledSessionResponse {
}