syntax = "proto3";

package musicfs.v1;

option go_package = "homelab.lan/music-agregator/gen/musicfs/v1;musicfsv1";

service MusicFS {
  rpc Search(SearchRequest) returns (SearchResponse);
  rpc SearchStream(SearchRequest) returns (stream SearchResult);
  rpc GetStatus(Empty) returns (StatusResponse);
  rpc Shutdown(ShutdownRequest) returns (Empty);
  rpc GetCacheStats(Empty) returns (CacheStats);
  rpc ClearCache(ClearCacheRequest) returns (ClearCacheResponse);
  rpc Prefetch(PrefetchRequest) returns (stream PrefetchProgress);
  rpc ListOrigins(Empty) returns (OriginsResponse);
  rpc GetOriginHealth(OriginRequest) returns (OriginHealthResponse);
  rpc RescanOrigin(OriginRequest) returns (stream SyncProgress);
  rpc SubscribeEvents(EventFilter) returns (stream Event);
}

service MetadataService {
  rpc GetMetadata(GetMetadataRequest) returns (MetadataResponse);
  rpc UpdateMetadata(UpdateMetadataRequest) returns (UpdateMetadataResponse);
  rpc ClearOverlay(ClearOverlayRequest) returns (ClearOverlayResponse);
  rpc BatchUpdateMetadata(BatchUpdateRequest) returns (stream BatchUpdateProgress);
  rpc ImportMetadata(ImportMetadataRequest) returns (stream ImportProgress);
}

message Empty {}

message SearchRequest {
  string query = 1;
  optional uint32 limit = 2;
  optional uint32 offset = 3;
  optional string origin_id = 4;
}

message SearchResponse {
  repeated SearchResult results = 1;
  uint64 total_matches = 2;
  uint32 query_time_ms = 3;
}

message SearchResult {
  int64 file_id = 1;
  string virtual_path = 2;
  optional string artist = 3;
  optional string album = 4;
  optional string title = 5;
  float score = 6;
  map<string, string> highlights = 7;
}

enum MountState {
  MOUNT_UNKNOWN = 0;
  MOUNT_MOUNTING = 1;
  MOUNT_READY = 2;
  MOUNT_SYNCING = 3;
  MOUNT_DEGRADED = 4;
  MOUNT_UNMOUNTING = 5;
}

message StatusResponse {
  string version = 1;
  uint64 uptime_secs = 2;
  string mount_point = 3;
  MountState state = 4;
  uint32 open_file_handles = 5;
  uint64 fuse_ops_total = 6;
  uint64 files_indexed = 7;
  uint64 cache_size_bytes = 8;
  repeated OriginStatus origins = 9;
}

message OriginStatus {
  string id = 1;
  string origin_type = 2;
  HealthStatus health = 3;
  uint64 files_count = 4;
}

enum HealthStatus {
  HEALTH_UNKNOWN = 0;
  HEALTH_HEALTHY = 1;
  HEALTH_DEGRADED = 2;
  HEALTH_UNHEALTHY = 3;
}

message ShutdownRequest {
  bool graceful = 1;
  uint32 timeout_secs = 2;
}

message TierStats {
  uint64 entries = 1;
  uint64 size_bytes = 2;
  uint64 hits = 3;
  uint64 misses = 4;
}

message CacheStats {
  uint64 total_size_bytes = 1;
  uint64 used_size_bytes = 2;
  uint64 size_limit_bytes = 3;
  uint64 chunk_count = 4;
  uint64 chunks_unique = 5;
  double dedup_ratio = 6;
  uint64 hit_count = 7;
  uint64 miss_count = 8;
  double hit_ratio = 9;
  uint64 metadata_entries = 10;
  uint64 metadata_bytes = 11;
  TierStats l1_metadata = 12;
  TierStats l2_headers = 13;
  TierStats l3_chunks = 14;
}

message ClearCacheRequest {
  optional string origin_id = 1;
  bool clear_metadata = 2;
  bool clear_chunks = 3;
}

message ClearCacheResponse {
  uint64 bytes_cleared = 1;
  uint64 chunks_cleared = 2;
}

message PrefetchRequest {
  repeated string paths = 1;
  optional string origin_id = 2;
}

message PrefetchProgress {
  string current_path = 1;
  uint32 completed = 2;
  uint32 total = 3;
  uint64 bytes_fetched = 4;
}

message OriginsResponse {
  repeated OriginInfo origins = 1;
}

message OriginInfo {
  string id = 1;
  string origin_type = 2;
  string display_name = 3;
  string root_path = 4;
  HealthStatus health = 5;
  uint64 files_count = 6;
  uint64 total_size_bytes = 7;
}

message OriginRequest {
  string origin_id = 1;
  // Optional subdirectory to scope the scan (relative to origin root).
  // If empty, scans the entire origin.
  // Example: "Metallica - Master of Puppets (1986) [FLAC]"
  optional string subdir = 2;
}

message OriginHealthResponse {
  string origin_id = 1;
  HealthStatus status = 2;
  optional string message = 3;
  uint64 last_check_secs = 4;
}

message SyncProgress {
  string phase = 1;
  uint32 current = 2;
  uint32 total = 3;
  string current_path = 4;
  uint64 bytes_synced = 5;
  repeated SyncedFile new_files = 6;
}

message SyncedFile {
  string path = 1;
  int64 file_id = 2;
  string virtual_path = 3;
}

message EventFilter {
  repeated string event_types = 1;
  optional string origin_id = 2;
}

message Event {
  string event_type = 1;
  int64 timestamp_ms = 2;
  optional string origin_id = 3;
  optional string path = 4;
  optional int64 file_id = 5;
  map<string, string> metadata = 6;
}

// MetadataService messages

message GetMetadataRequest {
  string virtual_path = 1;
}

message MetadataResponse {
  int64 file_id = 1;
  optional string title = 2;
  optional string artist = 3;
  optional string album = 4;
  optional string album_artist = 5;
  optional uint32 year = 6;
  optional uint32 track = 7;
  optional uint32 disc = 8;
  optional string genre = 9;
  optional string format = 10;
  optional uint64 duration_ms = 11;
  optional uint64 bitrate = 12;
  optional uint32 track_total = 13;
  optional uint32 disc_total = 14;
  optional string date = 15;
  optional string composer = 16;
  optional string comment = 17;
  optional string lyrics = 18;
  optional string copyright = 19;
  optional bool compilation = 20;
  optional string artist_sort = 21;
  optional string album_artist_sort = 22;
  optional string album_sort = 23;
  optional string title_sort = 24;
  optional string mb_recording_id = 25;
  optional string mb_album_id = 26;
  optional string mb_artist_id = 27;
  optional string mb_album_artist_id = 28;
  optional string mb_release_group_id = 29;
  optional float replaygain_track_gain = 30;
  optional float replaygain_track_peak = 31;
  optional float replaygain_album_gain = 32;
  optional float replaygain_album_peak = 33;
  optional uint32 channels = 34;
  optional uint32 bits_per_sample = 35;
  optional string encoder = 36;
  optional string label = 40;
  optional string album_type = 41;
  optional string cover_url = 42;
  map<string, string> custom_tags = 50;
}

message UpdateMetadataRequest {
  int64 file_id = 1;
  optional string title = 2;
  optional string artist = 3;
  optional string album = 4;
  optional string album_artist = 5;
  optional uint32 track_number = 6;
  optional uint32 disc_number = 7;
  optional string date = 8;
  optional string genre = 9;
  optional string composer = 10;
  optional string comment = 11;
  optional string lyrics = 12;
  optional string copyright = 13;
  optional bool compilation = 14;
  optional string artist_sort = 15;
  optional string album_artist_sort = 16;
  optional string album_sort = 17;
  optional string title_sort = 18;
  optional string mb_recording_id = 20;
  optional string mb_album_id = 21;
  optional string mb_artist_id = 22;
  optional float replaygain_track_gain = 30;
  optional float replaygain_track_peak = 31;
  optional float replaygain_album_gain = 32;
  optional float replaygain_album_peak = 33;
  optional string label = 40;
  optional string album_type = 41;
  optional string cover_url = 42;
  map<string, string> custom_tags = 50;
}

message UpdateMetadataResponse {
  int64 file_id = 1;
  bool success = 2;
  optional string error_message = 3;
}

message ClearOverlayRequest {
  int64 file_id = 1;
}

message ClearOverlayResponse {
  int64 file_id = 1;
  bool success = 2;
  optional string error_message = 3;
}

message BatchUpdateRequest {
  repeated BatchUpdateItem items = 1;
}

message BatchUpdateItem {
  int64 file_id = 1;
  UpdateMetadataRequest metadata = 2;
}

message BatchUpdateProgress {
  uint32 completed = 1;
  uint32 total = 2;
  optional int64 current_file_id = 3;
  optional string error_message = 4;
}

message ImportMetadataRequest {
  string source_path = 1;
  optional string format = 2;
}

message ImportProgress {
  uint32 imported = 1;
  uint32 total = 2;
  optional string current_file = 3;
  optional string error_message = 4;
}