syntax = "proto3";

package zephyrfs.node;

option go_package = "github.com/ZephyrFS/zephyrfs-proto/gen/go/node";

// Core message types for P2P communication
service NodeService {
  // Health check for node status
  rpc HealthCheck(HealthCheckRequest) returns (HealthCheckResponse);
  
  // Peer discovery and connection management
  rpc RegisterPeer(RegisterPeerRequest) returns (RegisterPeerResponse);
  rpc GetPeers(GetPeersRequest) returns (GetPeersResponse);
  
  // Chunk storage operations
  rpc StoreChunk(StoreChunkRequest) returns (StoreChunkResponse);
  rpc RetrieveChunk(RetrieveChunkRequest) returns (RetrieveChunkResponse);
  rpc DeleteChunk(DeleteChunkRequest) returns (DeleteChunkResponse);
  
  // File metadata operations
  rpc StoreMetadata(StoreMetadataRequest) returns (StoreMetadataResponse);
  rpc RetrieveMetadata(RetrieveMetadataRequest) returns (RetrieveMetadataResponse);
}

// Health check messages
message HealthCheckRequest {}

message HealthCheckResponse {
  string status = 1;
  int64 timestamp = 2;
  NodeInfo node_info = 3;
}

// Peer management messages
message RegisterPeerRequest {
  PeerInfo peer = 1;
}

message RegisterPeerResponse {
  bool success = 1;
  string message = 2;
}

message GetPeersRequest {
  int32 limit = 1;
}

message GetPeersResponse {
  repeated PeerInfo peers = 1;
}

// Chunk storage messages
message StoreChunkRequest {
  string chunk_id = 1;
  bytes data = 2;
  string hash = 3;
  int64 size = 4;
  map<string, string> metadata = 5;
}

message StoreChunkResponse {
  bool success = 1;
  string message = 2;
  string stored_hash = 3;
}

message RetrieveChunkRequest {
  string chunk_id = 1;
  string expected_hash = 2;
}

message RetrieveChunkResponse {
  bool success = 1;
  string message = 2;
  bytes data = 3;
  string hash = 4;
  int64 size = 5;
}

message DeleteChunkRequest {
  string chunk_id = 1;
  string reason = 2;
}

message DeleteChunkResponse {
  bool success = 1;
  string message = 2;
}

// Metadata messages
message StoreMetadataRequest {
  string file_id = 1;
  FileMetadata metadata = 2;
}

message StoreMetadataResponse {
  bool success = 1;
  string message = 2;
}

message RetrieveMetadataRequest {
  string file_id = 1;
}

message RetrieveMetadataResponse {
  bool success = 1;
  string message = 2;
  FileMetadata metadata = 3;
}

// Data structures
message NodeInfo {
  string node_id = 1;
  string version = 2;
  repeated string addresses = 3;
  int64 storage_available = 4;
  int64 storage_used = 5;
  int64 uptime_seconds = 6;
  string status = 7;
}

message PeerInfo {
  string peer_id = 1;
  repeated string addresses = 2;
  int64 last_seen = 3;
  string status = 4;
  double reputation_score = 5;
}

message FileMetadata {
  string file_id = 1;
  string name = 2;
  int64 size = 3;
  string mime_type = 4;
  string hash = 5;
  repeated ChunkInfo chunks = 6;
  int64 created_at = 7;
  int64 modified_at = 8;
  map<string, string> user_metadata = 9;
}

message ChunkInfo {
  string chunk_id = 1;
  string hash = 2;
  int64 size = 3;
  int32 index = 4;
  repeated string stored_at_peers = 5;
}