syntax = "proto3";

package hello;

import "google/protobuf/timestamp.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/empty.proto";
import "google/protobuf/wrappers.proto";
import "google/protobuf/struct.proto";
import "google/protobuf/any.proto";
import "google/protobuf/field_mask.proto";

// option (tarantool.lua_package) = "hello.foo";  // optional override

enum Status {
  UNKNOWN = 0;
  OK = 1;
  ERROR = 2;
}

// Demo message for oneof handling.
message Result {
  int32 id = 1;
  oneof outcome {
    string text = 2;
    int32 code = 3;
    Address details = 4;
  }
}

// gRPC service demo. Covers unary + all three streaming flavors so the
// loopback transport exercises every codegen branch.
message HelloRequest {
  string name = 1;
}
message HelloReply {
  string greeting = 1;
}
service Greeter {
  rpc SayHello(HelloRequest) returns (HelloReply);
  rpc Echo(HelloRequest) returns (HelloRequest);
  // Server-streaming: one request, server pushes N replies.
  rpc StreamHellos(HelloRequest) returns (stream HelloReply);
  // Client-streaming: client pushes N requests, server returns one reply.
  rpc CollectHellos(stream HelloRequest) returns (HelloReply);
  // Bidirectional: both sides push and pull independently.
  rpc Chat(stream HelloRequest) returns (stream HelloReply);
}

// Demo message exercising well-known types (M3).
message Event {
  string title = 1;
  google.protobuf.Timestamp created_at = 2;
  google.protobuf.Duration duration = 3;
  google.protobuf.Empty ack = 4;
  google.protobuf.Int32Value retry_count = 5;
  google.protobuf.StringValue note = 6;
  google.protobuf.BoolValue is_admin = 7;
  google.protobuf.Struct payload = 8;
  google.protobuf.Value attribute = 9;
  google.protobuf.ListValue tags = 10;
  google.protobuf.Any extension = 11;
  google.protobuf.FieldMask update_mask = 12;
}

message Address {
  string street = 1;
  string city = 2;
  int32 zip = 3;
  // Explicit-optional: presence is meaningful (distinct from default).
  optional string apartment = 4;
}

message Person {
  string name = 1;
  int32 age = 2;
  repeated string emails = 3;
  Status status = 4;
  Address address = 5;
  repeated Person friends = 6;     // self-reference
  repeated int32 lucky_numbers = 7; // packed by default
  bytes avatar = 8;
  fixed64 user_id = 9;
  sint32 balance = 10;              // zigzag
  double weight_kg = 11;

  // Map fields (M2)
  map<string, int32> ages_by_nickname = 13;        // scalar value
  map<int32, string> nickname_by_age = 14;         // scalar key + value
  map<string, Address> addresses_by_label = 15;    // message value
}