// Copyright: Ankitects Pty Ltd and contributors
// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

syntax = "proto3";

option java_multiple_files = true;

package anki.sync;

import "anki/generic.proto";

// Syncing methods are only available with a Backend handle.
service SyncService {}

service BackendSyncService {
  rpc SyncMedia(SyncAuth) returns (generic.Empty);
  rpc AbortMediaSync(generic.Empty) returns (generic.Empty);
  // Can be used by the frontend to detect an active sync. If the sync aborted
  // with an error, the next call to this method will return the error.
  rpc MediaSyncStatus(generic.Empty) returns (MediaSyncStatusResponse);
  rpc SyncLogin(SyncLoginRequest) returns (SyncAuth);
  rpc SyncStatus(SyncAuth) returns (SyncStatusResponse);
  rpc SyncCollection(SyncCollectionRequest) returns (SyncCollectionResponse);
  rpc FullUploadOrDownload(FullUploadOrDownloadRequest) returns (generic.Empty);
  rpc AbortSync(generic.Empty) returns (generic.Empty);
  rpc SetCustomCertificate(generic.String) returns (generic.Bool);
}

message SyncAuth {
  string hkey = 1;
  optional string endpoint = 2;
  optional uint32 io_timeout_secs = 3;
}

message SyncLoginRequest {
  string username = 1;
  string password = 2;
  optional string endpoint = 3;
}

message SyncStatusResponse {
  enum Required {
    NO_CHANGES = 0;
    NORMAL_SYNC = 1;
    FULL_SYNC = 2;
  }
  Required required = 1;
  optional string new_endpoint = 4;
}

message SyncCollectionRequest {
  SyncAuth auth = 1;
  bool sync_media = 2;
}

message SyncCollectionResponse {
  enum ChangesRequired {
    NO_CHANGES = 0;
    NORMAL_SYNC = 1;
    FULL_SYNC = 2;
    // local collection has no cards; upload not an option
    FULL_DOWNLOAD = 3;
    // remote collection has no cards; download not an option
    FULL_UPLOAD = 4;
  }

  uint32 host_number = 1;
  string server_message = 2;
  ChangesRequired required = 3;
  optional string new_endpoint = 4;
  int32 server_media_usn = 5;
}

message MediaSyncStatusResponse {
  bool active = 1;
  MediaSyncProgress progress = 2;
}

message MediaSyncProgress {
  string checked = 1;
  string added = 2;
  string removed = 3;
}

message FullUploadOrDownloadRequest {
  SyncAuth auth = 1;
  bool upload = 2;
  // if not provided, media syncing will be skipped
  optional int32 server_usn = 3;
}