syntax = "proto3";
package orlysync.distributed.v1;
option go_package = "next.orly.dev/pkg/proto/orlysync/distributed/v1;distributedv1";

import "orlysync/common/v1/types.proto";

// DistributedSyncService provides serial-based peer-to-peer synchronization
// between relay instances using HTTP polling
service DistributedSyncService {
  // === Lifecycle Methods ===

  // Ready returns whether the service is ready to serve requests
  rpc Ready(orlysync.common.v1.Empty) returns (orlysync.common.v1.ReadyResponse);

  // GetInfo returns current sync service information
  rpc GetInfo(orlysync.common.v1.Empty) returns (orlysync.common.v1.SyncInfo);

  // === Sync Operations ===

  // GetCurrentSerial returns this relay's current serial number
  rpc GetCurrentSerial(CurrentRequest) returns (CurrentResponse);

  // GetEventIDs returns event IDs for a serial range
  rpc GetEventIDs(EventIDsRequest) returns (EventIDsResponse);

  // === HTTP Proxy Handlers ===
  // These allow the main relay to delegate HTTP sync endpoints to this service

  // HandleCurrentRequest proxies /api/sync/current HTTP requests
  rpc HandleCurrentRequest(orlysync.common.v1.HTTPRequest) returns (orlysync.common.v1.HTTPResponse);

  // HandleEventIDsRequest proxies /api/sync/event-ids HTTP requests
  rpc HandleEventIDsRequest(orlysync.common.v1.HTTPRequest) returns (orlysync.common.v1.HTTPResponse);

  // === Peer Management ===

  // GetPeers returns the current list of sync peers
  rpc GetPeers(orlysync.common.v1.Empty) returns (PeersResponse);

  // UpdatePeers updates the peer list
  rpc UpdatePeers(UpdatePeersRequest) returns (orlysync.common.v1.Empty);

  // IsAuthorizedPeer checks if a peer is authorized by validating its NIP-11 pubkey
  rpc IsAuthorizedPeer(AuthorizedPeerRequest) returns (AuthorizedPeerResponse);

  // GetPeerPubkey fetches the pubkey for a peer relay via NIP-11
  rpc GetPeerPubkey(PeerPubkeyRequest) returns (PeerPubkeyResponse);

  // === Serial Tracking ===

  // UpdateSerial updates the current serial from database
  rpc UpdateSerial(orlysync.common.v1.Empty) returns (orlysync.common.v1.Empty);

  // NotifyNewEvent notifies the service of a new event being stored
  rpc NotifyNewEvent(NewEventNotification) returns (orlysync.common.v1.Empty);

  // === Sync Control ===

  // TriggerSync manually triggers a sync cycle with all peers
  rpc TriggerSync(orlysync.common.v1.Empty) returns (orlysync.common.v1.Empty);

  // GetSyncStatus returns current sync status for all peers
  rpc GetSyncStatus(orlysync.common.v1.Empty) returns (SyncStatusResponse);
}

// === Request/Response Messages ===

// CurrentRequest is sent to request current serial number
message CurrentRequest {
  string node_id = 1;     // Requesting node's identity
  string relay_url = 2;   // Requesting relay's URL
}

// CurrentResponse contains the current serial number
message CurrentResponse {
  string node_id = 1;     // Responding node's identity
  string relay_url = 2;   // Responding relay's URL
  uint64 serial = 3;      // Current serial number
}

// EventIDsRequest requests event IDs in a serial range
message EventIDsRequest {
  string node_id = 1;     // Requesting node's identity
  string relay_url = 2;   // Requesting relay's URL
  uint64 from = 3;        // Start serial (inclusive)
  uint64 to = 4;          // End serial (inclusive)
}

// EventIDsResponse contains event IDs mapped to serial numbers
message EventIDsResponse {
  map<string, uint64> event_map = 1;  // event_id (hex) -> serial
}

// PeersResponse contains the list of sync peers
message PeersResponse {
  repeated string peers = 1;  // List of peer relay URLs
}

// UpdatePeersRequest updates the peer list
message UpdatePeersRequest {
  repeated string peers = 1;  // New list of peer relay URLs
}

// AuthorizedPeerRequest checks if a peer is authorized
message AuthorizedPeerRequest {
  string peer_url = 1;
  string expected_pubkey = 2;  // Expected NIP-11 pubkey
}

// AuthorizedPeerResponse indicates if the peer is authorized
message AuthorizedPeerResponse {
  bool authorized = 1;
}

// PeerPubkeyRequest requests the pubkey for a peer
message PeerPubkeyRequest {
  string peer_url = 1;
}

// PeerPubkeyResponse contains the peer's pubkey
message PeerPubkeyResponse {
  string pubkey = 1;  // Peer's NIP-11 pubkey (hex or npub)
}

// NewEventNotification notifies of a new event
message NewEventNotification {
  bytes event_id = 1;   // 32 bytes event ID
  uint64 serial = 2;    // Assigned serial number
}

// SyncStatusResponse contains sync status for all peers
message SyncStatusResponse {
  uint64 current_serial = 1;
  repeated orlysync.common.v1.PeerInfo peers = 2;
}