syntax = "proto3";

import 'google/protobuf/empty.proto';

package library;

service Library {
	rpc ListTracks(google.protobuf.Empty) returns (TrackList);
	rpc ListPlaylists(google.protobuf.Empty) returns (ListPlaylistsResponse);
	rpc CreatePlaylist(CreatePlaylistRequest) returns (CreatePlaylistResponse);
	rpc DeletePlaylist(DeletePlaylistRequest) returns (google.protobuf.Empty);
	rpc AddTrackToPlaylist(AddTrackToPlaylistRequest) returns (TrackList);
	rpc RemoveTrackFromPlaylist(RemoveTrackFromPlaylistRequest) returns (TrackList);
	rpc SwapTracks(SwapTracksRequest) returns (TrackList);
}

message TrackList {
	repeated Track tracks = 1;
}

message Track {
	string hash = 1;
	string name = 2;
	string artist_name = 3;
	uint64 artist_id = 4;
	uint64 duration = 5;
}

message Playlist {
	uint32 id = 1;
	string name = 2;
	repeated Track tracks = 3;
}

message ListPlaylistsResponse {
	repeated Playlist playlists = 1;
}

message CreatePlaylistRequest {
	string name = 1;
}

message CreatePlaylistResponse {
	Playlist playlist = 1;
}

message DeletePlaylistRequest {
	uint32 id = 1;
}

message AddTrackToPlaylistRequest {
	uint32 playlist_id = 1;
	string track_hash = 2;
}

message RemoveTrackFromPlaylistRequest {
	uint32 playlist_id = 1;
	uint32 track_rank = 2;
}

message SwapTracksRequest {
	uint32 playlist_id = 1;
	uint32 a_rank = 2;
	uint32 b_rank = 3;
}