syntax = "proto3";
package anySpace;

option go_package = "common/commonspace/spacesyncproto";
import "pkg/acl/aclchanges/aclpb/protos/aclchanges.proto";

enum ErrCodes {
    Unexpected = 0;
}

service Space {
    // HeadSync compares all objects and their hashes in a space
    rpc HeadSync(HeadSyncRequest) returns (HeadSyncResponse);
    rpc Stream(stream ObjectSyncMessage) returns (stream ObjectSyncMessage);
}

// HeadSyncRange presenting a request for one range
message HeadSyncRange {
    uint64 from = 1;
    uint64 to = 2;
    uint32 limit = 3;
}

// HeadSyncResult presenting a response for one range
message HeadSyncResult {
    bytes hash = 1;
    repeated HeadSyncResultElement elements = 2;
    uint32 count = 3;
}

// HeadSyncResultElement presenting state of one object
message HeadSyncResultElement {
    string id = 1;
    string head = 2;
}

// HeadSyncRequest is a request for HeadSync
message HeadSyncRequest {
    string spaceId = 1;
    repeated HeadSyncRange ranges = 2;
}

// HeadSyncResponse is a response for HeadSync
message HeadSyncResponse {
    repeated HeadSyncResult results = 1;
}

// ObjectSyncMessage is a message sent on object sync
message ObjectSyncMessage {
    string spaceId = 1;
    ObjectSyncContentValue content = 2;
    acl.TreeHeader treeHeader = 3;
    string treeId = 4;
    string trackingId = 5;
//
//    string identity = 5;
//    string peerSignature = 6;
}

// ObjectSyncContentValue provides different types for object sync
message ObjectSyncContentValue {
    oneof value {
        ObjectHeadUpdate headUpdate = 1;
        ObjectFullSyncRequest fullSyncRequest = 2;
        ObjectFullSyncResponse fullSyncResponse = 3;
        ObjectErrorResponse errorResponse = 4;
    }
}

// ObjectHeadUpdate is a message sent on document head update
message ObjectHeadUpdate {
    repeated string heads = 1;
    repeated acl.RawTreeChangeWithId changes = 2;
    repeated string snapshotPath = 3;
}

// ObjectHeadUpdate is a message sent when document needs full sync
message ObjectFullSyncRequest {
    repeated string heads = 1;
    repeated acl.RawTreeChangeWithId changes = 2;
    repeated string snapshotPath = 3;
}

// ObjectFullSyncResponse is a message sent as a response for a specific full sync
message ObjectFullSyncResponse {
    repeated string heads = 1;
    repeated acl.RawTreeChangeWithId changes = 2;
    repeated string snapshotPath = 3;
}

message ObjectErrorResponse {
    string error = 1;
}