syntax = "proto3";

package ZB.MOM.WW.CBDDC.Network.Proto;

option csharp_namespace = "ZB.MOM.WW.CBDDC.Network.Proto";

message HandshakeRequest {
  string node_id = 1;
  string auth_token = 2;
  repeated string supported_compression = 3; // v4
  repeated string interesting_collections = 4; // v5
  string dataset_id = 5; // v6
}

message HandshakeResponse {
  string node_id = 1;
  bool accepted = 2;
  string selected_compression = 3; // v4
  repeated string interesting_collections = 4; // v5
  string dataset_id = 5; // v6
  optional bool dataset_supported = 6; // v6
}

message GetClockRequest {
}

message ClockResponse {
  int64 hlc_wall = 1;
  int32 hlc_logic = 2;
  string hlc_node = 3;
}

message GetVectorClockRequest {
}

message VectorClockResponse {
  repeated VectorClockEntry entries = 1;
}

message VectorClockEntry {
  string node_id = 1;
  int64 hlc_wall = 2;
  int32 hlc_logic = 3;
}

message PullChangesRequest {
  int64 since_wall = 1;
  int32 since_logic = 2;
  string since_node = 3;
  repeated string collections = 4; // v5: Filter by collection
  string dataset_id = 5; // v6
}

message ChangeSetResponse {
  repeated ProtoOplogEntry entries = 1;
}

message PushChangesRequest {
  repeated ProtoOplogEntry entries = 1;
  string dataset_id = 2; // v6
}

message GetChainRangeRequest { 
  string start_hash = 1; 
  string end_hash = 2; 
  string dataset_id = 3; // v6
}

message ChainRangeResponse { 
  repeated ProtoOplogEntry entries = 1; 
  bool snapshot_required = 2;
}

message AckResponse {
  bool success = 1;
  bool snapshot_required = 2;
}

message ProtoOplogEntry {
  string collection = 1;
  string key = 2;
  string operation = 3; // "Put" or "Delete"
  string json_data = 4;
  int64 hlc_wall = 5;
  int32 hlc_logic = 6;
  string hlc_node = 7;
  string hash = 8;
  string previous_hash = 9;
  string dataset_id = 10; // v6
}

message GetSnapshotRequest {
  string dataset_id = 1; // v6
}

message SnapshotChunk {
    bytes data = 1;
    bool is_last = 2;
}

// Enum for wire framing (1 byte)
enum MessageType {
  Unknown = 0;
  HandshakeReq = 1;
  HandshakeRes = 2;
  GetClockReq = 3;
  ClockRes = 4;
  PullChangesReq = 5;
  ChangeSetRes = 6;
  PushChangesReq = 7;
  AckRes = 8;
  SecureEnv = 9;
  GetChainRangeReq = 10;
  ChainRangeRes = 11;
  GetVectorClockReq = 12;
  VectorClockRes = 13;
  GetSnapshotReq = 14;
  SnapshotChunkMsg = 15;
}

message SecureEnvelope {
  bytes ciphertext = 1; // Encrypted payload
  bytes nonce = 2;      // IV or Nonce
  bytes auth_tag = 3;   // HMAC or Auth Tag if using AEAD (optional if concatenated)
}