syntax = "proto3";

package musicfs.v1;

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);
}

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;
}

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;
}

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;
}