// Copyright 2019 The Nakama Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * The realtime protocol for Nakama server.
 */
syntax = "proto3";

package nakama.realtime;

import "google/protobuf/timestamp.proto";
import "google/protobuf/wrappers.proto";
import "api/api.proto";

option go_package = "github.com/heroiclabs/nakama-common/rtapi";

option java_multiple_files = true;
option java_outer_classname = "NakamaRealtime";
option java_package = "com.heroiclabs.nakama.rtapi";

option csharp_namespace = "Nakama.Protobuf";

// An envelope for a realtime message.
message Envelope {
  string cid = 1;
  oneof message {
    // A response from a channel join operation.
    Channel channel = 2;
    // Join a realtime chat channel.
    ChannelJoin channel_join = 3;
    // Leave a realtime chat channel.
    ChannelLeave channel_leave = 4;
    // An incoming message on a realtime chat channel.
    api.ChannelMessage channel_message = 5;
    // An acknowledgement received in response to sending a message on a chat channel.
    ChannelMessageAck channel_message_ack = 6;
    // Send a message to a realtime chat channel.
    ChannelMessageSend channel_message_send = 7;
    // Update a message previously sent to a realtime chat channel.
    ChannelMessageUpdate channel_message_update = 8;
    // Remove a message previously sent to a realtime chat channel.
    ChannelMessageRemove channel_message_remove = 9;
    // Presence update for a particular realtime chat channel.
    ChannelPresenceEvent channel_presence_event = 10;
    // Describes an error which occurred on the server.
    Error error = 11;
    // Incoming information about a realtime match.
    Match match = 12;
    // A client to server request to create a realtime match.
    MatchCreate match_create = 13;
    // Incoming realtime match data delivered from the server.
    MatchData match_data = 14;
    // A client to server request to send data to a realtime match.
    MatchDataSend match_data_send = 15;
    // A client to server request to join a realtime match.
    MatchJoin match_join = 16;
    // A client to server request to leave a realtime match.
    MatchLeave match_leave = 17;
    // Presence update for a particular realtime match.
    MatchPresenceEvent match_presence_event = 18;
    // Submit a new matchmaking process request.
    MatchmakerAdd matchmaker_add = 19;
    // A successful matchmaking result.
    MatchmakerMatched matchmaker_matched = 20;
    // Cancel a matchmaking process using a ticket.
    MatchmakerRemove matchmaker_remove = 21;
    // A response from starting a new matchmaking process.
    MatchmakerTicket matchmaker_ticket = 22;
    // Notifications send by the server.
    Notifications notifications = 23;
    // RPC call or response.
    api.Rpc rpc = 24;
    // An incoming status snapshot for some set of users.
    Status status = 25;
    // Start following some set of users to receive their status updates.
    StatusFollow status_follow = 26;
    // An incoming status update.
    StatusPresenceEvent status_presence_event = 27;
    // Stop following some set of users to no longer receive their status updates.
    StatusUnfollow status_unfollow = 28;
    // Set the user's own status.
    StatusUpdate status_update = 29;
    // A data message delivered over a stream.
    StreamData stream_data = 30;
    // Presence update for a particular stream.
    StreamPresenceEvent stream_presence_event = 31;
    // Application-level heartbeat and connection check.
    Ping ping = 32;
    // Application-level heartbeat and connection check response.
    Pong pong = 33;
    // Incoming information about a party.
    Party party = 34;
    // Create a party.
    PartyCreate party_create = 35;
    // Join a party, or request to join if the party is not open.
    PartyJoin party_join = 36;
    // Leave a party.
    PartyLeave party_leave = 37;
    // Promote a new party leader.
    PartyPromote party_promote = 38;
    // Announcement of a new party leader.
    PartyLeader party_leader = 39;
    // Accept a request to join.
    PartyAccept party_accept = 40;
    // Kick a party member, or decline a request to join.
    PartyRemove party_remove = 41;
    // End a party, kicking all party members and closing it.
    PartyClose party_close = 42;
    // Request a list of pending join requests for a party.
    PartyJoinRequestList party_join_request_list = 43;
    // Incoming notification for one or more new presences attempting to join the party.
    PartyJoinRequest party_join_request = 44;
    // Begin matchmaking as a party.
    PartyMatchmakerAdd party_matchmaker_add = 45;
    // Cancel a party matchmaking process using a ticket.
    PartyMatchmakerRemove party_matchmaker_remove = 46;
    // A response from starting a new party matchmaking process.
    PartyMatchmakerTicket party_matchmaker_ticket = 47;
    // Incoming party data delivered from the server.
    PartyData party_data = 48;
    // A client to server request to send data to a party.
    PartyDataSend party_data_send = 49;
    // Presence update for a particular party.
    PartyPresenceEvent party_presence_event = 50;
  }
}

// A realtime chat channel.
message Channel {
  // The ID of the channel.
  string id = 1;
  // The users currently in the channel.
  repeated UserPresence presences = 2;
  // A reference to the current user's presence in the channel.
  UserPresence self = 3;
  // The name of the chat room, or an empty string if this message was not sent through a chat room.
  string room_name = 4;
  // The ID of the group, or an empty string if this message was not sent through a group channel.
  string group_id = 5;
  // The ID of the first DM user, or an empty string if this message was not sent through a DM chat.
  string user_id_one = 6;
  // The ID of the second DM user, or an empty string if this message was not sent through a DM chat.
  string user_id_two = 7;
}

// Join operation for a realtime chat channel.
message ChannelJoin {
  // The type of chat channel.
  enum Type {
    // Default case. Assumed as ROOM type.
    TYPE_UNSPECIFIED = 0;
    // A room which anyone can join to chat.
    ROOM = 1;
    // A private channel for 1-on-1 chat.
    DIRECT_MESSAGE = 2;
    // A channel for group chat.
    GROUP = 3;
  }

  // The user ID to DM with, group ID to chat with, or room channel name to join.
  string target = 1;
  // The type of the chat channel.
  int32 type = 2; // one of "ChannelId.Type".
  // Whether messages sent on this channel should be persistent.
  google.protobuf.BoolValue persistence = 3;
  // Whether the user should appear in the channel's presence list and events.
  google.protobuf.BoolValue hidden = 4;
}

// Leave a realtime channel.
message ChannelLeave {
  // The ID of the channel to leave.
  string channel_id = 1;
}

// A receipt reply from a channel message send operation.
message ChannelMessageAck {
  // The channel the message was sent to.
  string channel_id = 1;
  // The unique ID assigned to the message.
  string message_id = 2;
  // The code representing a message type or category.
  google.protobuf.Int32Value code = 3;
  // Username of the message sender.
  string username = 4;
  // The UNIX time (for gRPC clients) or ISO string (for REST clients) when the message was created.
  google.protobuf.Timestamp create_time = 5;
  // The UNIX time (for gRPC clients) or ISO string (for REST clients) when the message was last updated.
  google.protobuf.Timestamp update_time = 6;
  // True if the message was persisted to the channel's history, false otherwise.
  google.protobuf.BoolValue persistent = 7;
  // The name of the chat room, or an empty string if this message was not sent through a chat room.
  string room_name = 8;
  // The ID of the group, or an empty string if this message was not sent through a group channel.
  string group_id = 9;
  // The ID of the first DM user, or an empty string if this message was not sent through a DM chat.
  string user_id_one = 10;
  // The ID of the second DM user, or an empty string if this message was not sent through a DM chat.
  string user_id_two = 11;
}

// Send a message to a realtime channel.
message ChannelMessageSend {
  // The channel to sent to.
  string channel_id = 1;
  // Message content.
  string content = 2;
}

// Update a message previously sent to a realtime channel.
message ChannelMessageUpdate {
  // The channel the message was sent to.
  string channel_id = 1;
  // The ID assigned to the message to update.
  string message_id = 2;
  // New message content.
  string content = 3;
}

// Remove a message previously sent to a realtime channel.
message ChannelMessageRemove {
  // The channel the message was sent to.
  string channel_id = 1;
  // The ID assigned to the message to update.
  string message_id = 2;
}

// A set of joins and leaves on a particular channel.
message ChannelPresenceEvent {
  // The channel identifier this event is for.
  string channel_id = 1;
  // Presences joining the channel as part of this event, if any.
  repeated UserPresence joins = 2;
  // Presences leaving the channel as part of this event, if any.
  repeated UserPresence leaves = 3;
  // The name of the chat room, or an empty string if this message was not sent through a chat room.
  string room_name = 4;
  // The ID of the group, or an empty string if this message was not sent through a group channel.
  string group_id = 5;
  // The ID of the first DM user, or an empty string if this message was not sent through a DM chat.
  string user_id_one = 6;
  // The ID of the second DM user, or an empty string if this message was not sent through a DM chat.
  string user_id_two = 7;
}

// A logical error which may occur on the server.
message Error {
  // The selection of possible error codes.
  enum Code {
    // An unexpected result from the server.
    RUNTIME_EXCEPTION = 0;
    // The server received a message which is not recognised.
    UNRECOGNIZED_PAYLOAD = 1;
    // A message was expected but contains no content.
    MISSING_PAYLOAD = 2;
    // Fields in the message have an invalid format.
    BAD_INPUT = 3;
    // The match id was not found.
    MATCH_NOT_FOUND = 4;
    // The match join was rejected.
    MATCH_JOIN_REJECTED = 5;
    // The runtime function does not exist on the server.
    RUNTIME_FUNCTION_NOT_FOUND = 6;
    // The runtime function executed with an error.
    RUNTIME_FUNCTION_EXCEPTION = 7;
  }

  // The error code which should be one of "Error.Code" enums.
  int32 code = 1;
  // A message in English to help developers debug the response.
  string message = 2;
  // Additional error details which may be different for each response.
  map<string, string> context = 3;
}

// A realtime match.
message Match {
  // The match unique ID.
  string match_id = 1;
  // True if it's an server-managed authoritative match, false otherwise.
  bool authoritative = 2;
  // Match label, if any.
  google.protobuf.StringValue label = 3;
  // The number of users currently in the match.
  int32 size = 4;
  // The users currently in the match.
  repeated UserPresence presences = 5;
  // A reference to the current user's presence in the match.
  UserPresence self = 6;
}

// Create a new realtime match.
message MatchCreate {
  // Optional name to use when creating the match.
  string name = 1;
}

// Realtime match data received from the server.
message MatchData {
  // The match unique ID.
  string match_id = 1;
  // A reference to the user presence that sent this data, if any.
  UserPresence presence = 2;
  // Op code value.
  int64 op_code = 3;
  // Data payload, if any.
  bytes data = 4;
  // True if this data was delivered reliably, false otherwise.
  bool reliable = 5;
}

// Send realtime match data to the server.
message MatchDataSend {
  // The match unique ID.
  string match_id = 1;
  // Op code value.
  int64 op_code = 2;
  // Data payload, if any.
  bytes data = 3;
  // List of presences in the match to deliver to, if filtering is required. Otherwise deliver to everyone in the match.
  repeated UserPresence presences = 4;
  // True if the data should be sent reliably, false otherwise.
  bool reliable = 5;
}

// Join an existing realtime match.
message MatchJoin {
  oneof id {
    // The match unique ID.
    string match_id = 1;
    // A matchmaking result token.
    string token = 2;
  }
  // An optional set of key-value metadata pairs to be passed to the match handler, if any.
  map<string, string> metadata = 3;
}

// Leave a realtime match.
message MatchLeave {
  // The match unique ID.
  string match_id = 1;
}

// A set of joins and leaves on a particular realtime match.
message MatchPresenceEvent {
  // The match unique ID.
  string match_id = 1;
  // User presences that have just joined the match.
  repeated UserPresence joins = 2;
  // User presences that have just left the match.
  repeated UserPresence leaves = 3;
}

// Start a new matchmaking process.
message MatchmakerAdd {
  // Minimum total user count to match together.
  int32 min_count = 1;
  // Maximum total user count to match together.
  int32 max_count = 2;
  // Filter query used to identify suitable users.
  string query = 3;
  // String properties.
  map<string, string> string_properties = 4;
  // Numeric properties.
  map<string, double> numeric_properties = 5;
  // Optional multiple of the count that must be satisfied.
  google.protobuf.Int32Value count_multiple = 6;
}

// A successful matchmaking result.
message MatchmakerMatched {
  message MatchmakerUser {
    // User info.
    UserPresence presence = 1;
    // Party identifier, if this user was matched as a party member.
    string party_id = 2;
    // String properties.
    map<string, string> string_properties = 5;
    // Numeric properties.
    map<string, double> numeric_properties = 6;
  }

  // The matchmaking ticket that has completed.
  string ticket = 1;
  // The match token or match ID to join.
  oneof id {
    // Match ID.
    string match_id = 2;
    // Match join token.
    string token = 3;
  }
  // The users that have been matched together, and information about their matchmaking data.
  repeated MatchmakerUser users = 4;
  // A reference to the current user and their properties.
  MatchmakerUser self = 5;
}

// Cancel an existing ongoing matchmaking process.
message MatchmakerRemove {
  // The ticket to cancel.
  string ticket = 1;
}

// A ticket representing a new matchmaking process.
message MatchmakerTicket {
  // The ticket that can be used to cancel matchmaking.
  string ticket = 1;
}

// A collection of zero or more notifications.
message Notifications {
  // Collection of notifications.
  repeated api.Notification notifications = 1;
}

// Incoming information about a party.
message Party {
  // Unique party identifier.
  string party_id = 1;
  // Open flag.
  bool open = 2;
  // Maximum number of party members.
  int32 max_size = 3;
  // Self.
  UserPresence self = 4;
  // Leader.
  UserPresence leader = 5;
  // All current party members.
  repeated UserPresence presences = 6;
}

// Create a party.
message PartyCreate {
  // Whether or not the party will require join requests to be approved by the party leader.
  bool open = 1;
  // Maximum number of party members.
  int32 max_size = 2;
}

// Join a party, or request to join if the party is not open.
message PartyJoin {
  // Party ID to join.
  string party_id = 1;
}

// Leave a party.
message PartyLeave {
  // Party ID to leave.
  string party_id = 1;
}

// Promote a new party leader.
message PartyPromote {
  // Party ID to promote a new leader for.
  string party_id = 1;
  // The presence of an existing party member to promote as the new leader.
  UserPresence presence = 2;
}

// Announcement of a new party leader.
message PartyLeader {
  // Party ID to announce the new leader for.
  string party_id = 1;
  // The presence of the new party leader.
  UserPresence presence = 2;
}

// Accept a request to join.
message PartyAccept {
  // Party ID to accept a join request for.
  string party_id = 1;
  // The presence to accept as a party member.
  UserPresence presence = 2;
}

// Kick a party member, or decline a request to join.
message PartyRemove {
  // Party ID to remove/reject from.
  string party_id = 1;
  // The presence to remove or reject.
  UserPresence presence = 2;
}

// End a party, kicking all party members and closing it.
message PartyClose {
  // Party ID to close.
  string party_id = 1;
}

// Request a list of pending join requests for a party.
message PartyJoinRequestList {
  // Party ID to get a list of join requests for.
  string party_id = 1;
}

// Incoming notification for one or more new presences attempting to join the party.
message PartyJoinRequest {
  // Party ID these presences are attempting to join.
  string party_id = 1;
  // Presences attempting to join.
  repeated UserPresence presences = 2;
}

// Begin matchmaking as a party.
message PartyMatchmakerAdd {
  // Party ID.
  string party_id = 1;
  // Minimum total user count to match together.
  int32 min_count = 2;
  // Maximum total user count to match together.
  int32 max_count = 3;
  // Filter query used to identify suitable users.
  string query = 4;
  // String properties.
  map<string, string> string_properties = 5;
  // Numeric properties.
  map<string, double> numeric_properties = 6;
  // Optional multiple of the count that must be satisfied.
  google.protobuf.Int32Value count_multiple = 7;
}

// Cancel a party matchmaking process using a ticket.
message PartyMatchmakerRemove {
  // Party ID.
  string party_id = 1;
  // The ticket to cancel.
  string ticket = 2;
}

// A response from starting a new party matchmaking process.
message PartyMatchmakerTicket {
  // Party ID.
  string party_id = 1;
  // The ticket that can be used to cancel matchmaking.
  string ticket = 2;
}

// Incoming party data delivered from the server.
message PartyData {
  // The party ID.
  string party_id = 1;
  // A reference to the user presence that sent this data, if any.
  UserPresence presence = 2;
  // Op code value.
  int64 op_code = 3;
  // Data payload, if any.
  bytes data = 4;
}

// Send data to a party.
message PartyDataSend {
  // Party ID to send to.
  string party_id = 1;
  // Op code value.
  int64 op_code = 2;
  // Data payload, if any.
  bytes data = 3;
}

// Presence update for a particular party.
message PartyPresenceEvent {
  // The party ID.
  string party_id = 1;
  // User presences that have just joined the party.
  repeated UserPresence joins = 2;
  // User presences that have just left the party.
  repeated UserPresence leaves = 3;
}


// Application-level heartbeat and connection check.
message Ping {}

// Application-level heartbeat and connection check response.
message Pong {}

// A snapshot of statuses for some set of users.
message Status {
  // User statuses.
  repeated UserPresence presences = 1;
}

// Start receiving status updates for some set of users.
message StatusFollow {
  // User IDs to follow.
  repeated string user_ids = 1;
  // Usernames to follow.
  repeated string usernames = 2;
}

// A batch of status updates for a given user.
message StatusPresenceEvent {
  // New statuses for the user.
  repeated UserPresence joins = 2;
  // Previous statuses for the user.
  repeated UserPresence leaves = 3;
}

// Stop receiving status updates for some set of users.
message StatusUnfollow {
  // Users to unfollow.
  repeated string user_ids = 1;
}

// Set the user's own status.
message StatusUpdate {
  // Status string to set, if not present the user will appear offline.
  google.protobuf.StringValue status = 1;
}

// Represents identifying information for a stream.
message Stream {
  // Mode identifies the type of stream.
  int32 mode = 1;
  // Subject is the primary identifier, if any.
  string subject = 2;
  // Subcontext is a secondary identifier, if any.
  string subcontext = 3;
  // The label is an arbitrary identifying string, if the stream has one.
  string label = 4;
}

// A data message delivered over a stream.
message StreamData {
  // The stream this data message relates to.
  Stream stream = 1;
  // The sender, if any.
  UserPresence sender = 2;
  // Arbitrary contents of the data message.
  string data = 3;
  // True if this data was delivered reliably, false otherwise.
  bool reliable = 4;
}

// A set of joins and leaves on a particular stream.
message StreamPresenceEvent {
  // The stream this event relates to.
  Stream stream = 1;
  // Presences joining the stream as part of this event, if any.
  repeated UserPresence joins = 2;
  // Presences leaving the stream as part of this event, if any.
  repeated UserPresence leaves = 3;
}

// A user session associated to a stream, usually through a list operation or a join/leave event.
message UserPresence {
  // The user this presence belongs to.
  string user_id = 1;
  // A unique session ID identifying the particular connection, because the user may have many.
  string session_id = 2;
  // The username for display purposes.
  string username = 3;
  // Whether this presence generates persistent data/messages, if applicable for the stream type.
  bool persistence = 4;
  // A user-set status message for this stream, if applicable.
  google.protobuf.StringValue status = 5;
}