syntax = "proto3";

package chat;
option go_package = "./proto;chat";

service Chat {
	rpc New(NewRequest) returns (NewResponse);
	rpc History(HistoryRequest) returns (HistoryResponse);
	rpc Send(SendRequest) returns (SendResponse);
	rpc List(ListRequest) returns (ListResponse);
	rpc Delete(DeleteRequest) returns (DeleteResponse);
	rpc Join(JoinRequest) returns (stream JoinResponse);
	rpc Invite(InviteRequest) returns (InviteResponse);
	rpc Leave(LeaveRequest) returns (LeaveResponse);
	rpc Kick(KickRequest) returns (KickResponse);
}

// Create a new chat room
message NewRequest {
	// name of the room
	string name = 1;
	// chat description
	string description = 2;
	// optional list of user ids
	repeated string user_ids = 3;
	// whether its a private room
	bool private = 4;
}

message NewResponse {
	// the unique chat room
	Room room = 1;
}

// List the messages in a chat
message HistoryRequest {
	// the chat room id to get
	string room_id = 1;
}

// HistoryResponse contains the historical messages in a chat
message HistoryResponse {
	// messages in the chat room
	repeated Message messages = 1;
}

// List available chats
message ListRequest {
	// optional user id to filter by
	string user_id = 1;
}

message ListResponse {
	repeated Room rooms = 1;
}

// Delete a chat room
message DeleteRequest {
	// the chat room id to delete
	string room_id = 1;
}

message DeleteResponse {
	Room room = 1;
}


// Connect to a chat to receive a stream of messages
// Send a message to a chat
message SendRequest {
	// a client side id, should be validated by the server to make the request retry safe
	string client = 1;
	// id of the chat room the message is being sent to / from
	string room_id = 2;
	// id of the user who sent the message
	string user_id = 3;
	// subject of the message
	string subject = 4;
	// text of the message
	string text = 5;
}

message SendResponse {
	// the message which was created
	Message message = 1;
}

// Join a chat room
message JoinRequest {
	// chat room to join
	string room_id = 1;
	// user id joining
	string user_id = 2;
}

message JoinResponse {
	Message message = 1;
}

message Room {
	// unique room id
	string id = 1;
	// name of the chat
	string name = 2;
	// description of the that
	string description = 3;
	// time of creation
	string created_at = 4;
	// list of users
	repeated string user_ids = 5;
	// whether its a private room
	bool private = 6;
}

// Message sent to a chat
message Message {
	// id of the message, allocated by the server
	string id = 1;
	// a client side id, should be validated by the server to make the request retry safe
	string client = 2;
	// id of the chat the message is being sent to / from
	string room_id = 3;
	// id of the user who sent the message
	string user_id = 4;
	// time the message was sent in RFC3339 format
	string sent_at = 5;
	// subject of the message
	string subject = 6;
	// text of the message
	string text = 7;
}

// Leave a chat room
message LeaveRequest {
	// the chat room id
	string room_id = 1;
	// the user id
	string user_id = 2;
}

message LeaveResponse {
	Room room = 1;
}

// Invite a user to a chat room
message InviteRequest {
	// the room id
	string room_id = 1;
	// the user id
	string user_id = 2;
}

message InviteResponse {
	Room room = 1;
}

// Kick a user from a chat room
message KickRequest {
	// the chat room id
	string room_id = 1;
	// the user id
	string user_id = 2;
}

message KickResponse {
	Room room = 1;
}