feat: stream currently playing + volume + toggle pause + seek position

proto/player.proto

@@ -1,13 +1,18 @@
 syntax = "proto3";
 
 import 'google/protobuf/empty.proto';
+import 'library.proto';
 
 package player;
 
 service Player {
 	rpc PlayTrack(PlayTrackRequest) returns (PlayTrackResponse);
-	rpc ResumeTrack(google.protobuf.Empty) returns (google.protobuf.Empty);
-	rpc PauseTrack(google.protobuf.Empty) returns (google.protobuf.Empty);
+	rpc ResumeTrack(google.protobuf.Empty) returns (PauseState);
+	rpc PauseTrack(google.protobuf.Empty) returns (PauseState);
+	rpc TogglePause(google.protobuf.Empty) returns (PauseState);
+	rpc GetStatus(google.protobuf.Empty) returns (stream PlayerStatus);
+	rpc SeekPosition(SeekPositionRequest) returns (SeekPositionResponse);
+	rpc SetVolume(SetVolumeRequest) returns (SetVolumeResponse);
 }
 
 message PlayTrackRequest {
@@ -15,4 +20,33 @@ message PlayTrackRequest {
 }
 
 message PlayTrackResponse {
+	library.Track track = 1;
+	uint64 position = 2;
+}
+
+message PlayerStatus {
+	optional library.Track currently_playing = 1;
+	bool is_paused = 2;
+	float volume = 3;
+	uint64 progress = 4;
+}
+
+message PauseState {
+	bool is_paused = 1;
+}
+
+message SeekPositionRequest {
+	uint64 position = 1;
+}
+
+message SeekPositionResponse {
+	uint64 position = 1;
+}
+
+message SetVolumeRequest  {
+	float volume = 1;
+}
+
+message SetVolumeResponse  {
+	float volume = 1;
 }