// You should use the field numbers 1 through 15 
// for the most-frequently-set fields. 
// Lower field number values take less space in the wire format. 
// For example, field numbers in the range 1 through 15 take one byte to encode. 
// Field numbers in the range 16 through 2047 take two bytes. 

syntax = "proto3";
package meowlib;
option go_package = "forge.redroom.link/yves/meowlib";

// structure definnig a message as received by a server in protobuf format
message PackedServerMessage {
	string from = 1; // The client public key for that server to get an answer 
	bytes payload = 2; // The ToServerMessage encrypted with the server public key |or| symetrical encryption as agreed earlier
	bytes signature = 3; // The message signature with the client public key |eo| the reference to teh symetrical key used
}

// structure defining a message for a server, that will be encrypted, then sent in a "packedmessage" payload
message ToServerMessage {
	string type = 1; // Type 1 : final destination / 2 : forward 
	string from = 2 ; // My pub key for the server to send me an encrypter answer
	bytes payload = 3 ; // optional payload for server

    // structure for requesting incoming messages
    message ConversationRequest {  
        string lookupKey = 1; // lookup key for a conversation
        string lastServerUuidOK = 2; // Last Server message UUID received (send me all after that one)
        bool publishOnline = 3; // ?? Publish my online status for that contact ?
        string lookupSignature = 4; // prove that I own the private key by signing that block
    } 
 
    repeated ConversationRequest pullRequest = 4; 

	repeated PackedUserMessage messages = 5; 

    repeated Server knownServers = 6; 

    Matriochka matriochkaMessage = 7;
    
    string uuid = 8;

}

// structure defining a from server receiver message decrypted from a "packedmessage" payload
message FromServerMessage {
	string type = 1; // Type 
	string serverPublicKey = 2 ; // Pub key from the server
	bytes payload = 3 ; // 
	string uuidAck = 4 ; // Ack for the last received ToServerMessage Uuid
	string serverUuid = 5 ; // Provides the server uuid that replaced the client uuid 

    message ConversationResponse {
        repeated string messageUuids = 1;
    }

	repeated PackedUserMessage chat = 6; 

    repeated Server knownServers = 7; 

}

message MatriochkaServer {
    string url = 1; // Server Url
    string publicKey = 2; // Server Public Key
    string uuid = 3 ; // Optional, uuid for delivery confirmation
    int32 delay = 4; // Max delay requested for message forwarding or delivery tracking
}

message Matriochka {
    string lookupKey = 1; // Optional, only if you want delivery tracking, less stealth
    MatriochkaServer prev = 2; // Optional, like above   
    MatriochkaServer next = 3; // Next server to deliver the message to
    bytes data = 4; // Matriochka data
}

// structure describing required server attributes
message Server {
    string	name = 1; 
    string description=2; 
    string publicKey = 3; 
    string url = 4; 
    bool publish = 5; // publish this server when asked for a list by server
    bytes signature = 6; // signature of all previous fields by the server itself
    int32 confidenceLevel = 7; // additional info from the user
}

// structure describing a user contact card ie the minimum set of attributes for exchanging identities
message ContactCard {
    string name=1;
	string contactPublicKey =2;
	string encryptionPublicKey= 3;
	string lookupPublicKey  =4;
	repeated Server pullServers =5; 
    uint32 version = 6;
    string invitationId=7;
}

// structure for sending a message to be forwarded to another user in protobuf format
message PackedUserMessage {
	string destination=1; // the peer's current conversation lookup public key
    bytes payload=2;  // the message UserMessage encrypted with the destination peer's public key
	bytes signature=3; // the payload signature with the client identity private key
    repeated int64 serverTimestamp=4; // server time stamp, might be several in matriochka mode
}


// structure defining information that might be exchanged between two peers.
message UserMessage {
	string destination = 1; // Lookupkey
	string from = 2; // My public key for that contact
	string type = 3; 
	bytes data = 4; 
    message ConversationStatus {
        string localUuid = 1; 
        uint64 localSequence = 2 ;
        uint64 sent = 3 ; 
        uint64 received = 4; 
        uint64 processed = 5; 
        ContactCard myNextIdentity = 6;
        int32  peerNextIdentityAck = 7; // version of the new peer accepted id
        }
    ConversationStatus Status = 5;

    ContactCard contact = 6;

    Server knownServers = 7;

    message Group{
        string name=1;
        repeated ContactCard members = 2;
    }
    Group group = 8;

    repeated File files = 9;

    Location currentLocation = 10;

    bytes appdata = 11; 
}

message File {
    string filename=1;
    uint64 size=2;
    uint32 chunk=3;
    bytes data=4;
}

message Location {
    uint64 time=1;
    float latitude=2;
    float longitude=3;
    int32 altitude=4;
}