syntax = "proto3";

package meshcore.v1;

option go_package = "github.com/meshcore-analyzer/proto/v1";

import "common.proto";
import "packet.proto";

// ─── Core Node Type ────────────────────────────────────────────────────────────

// A mesh network node. Defined ONCE, reused across all node-related endpoints.
// Fields that are absent/inapplicable remain at proto3 default (zero) or unset (optional).
message Node {
  // 64-character hex public key — unique node identifier.
  string public_key = 1 [json_name = "public_key"];
  // Display name (null if never advertised).
  optional string name = 2;
  // Node role: "repeater", "room", "companion", "sensor".
  string role = 3;
  // GPS latitude (null if no fix or unknown).
  optional double lat = 4;
  // GPS longitude (null if no fix or unknown).
  optional double lon = 5;
  // Last advert/upsert timestamp from DB (ISO 8601).
  string last_seen = 6 [json_name = "last_seen"];
  // When this node was first observed (ISO 8601).
  string first_seen = 7 [json_name = "first_seen"];
  // Total advertisement packets received.
  int32 advert_count = 8 [json_name = "advert_count"];
  // Latest observed hash size (1–3 bytes). Null if unknown.
  optional int32 hash_size = 9 [json_name = "hash_size"];
  // True if the node has been seen with different hash sizes.
  bool hash_size_inconsistent = 10 [json_name = "hash_size_inconsistent"];
  // All unique hash sizes seen (empty if only one or unknown).
  repeated int32 hash_sizes_seen = 11 [json_name = "hash_sizes_seen"];
  // Most recent timestamp from in-memory packets (ISO 8601).
  // More current than last_seen; absent if no in-memory data.
  optional string last_heard = 12 [json_name = "last_heard"];
}

// ─── Observer Stats (per-node context) ─────────────────────────────────────────

// How a specific observer sees a specific node.
// Used in bulk-health, node health, and node analytics observer coverage.
message NodeObserverStats {
  // Observer device identifier.
  string observer_id = 1 [json_name = "observer_id"];
  // Observer display name.
  optional string observer_name = 2 [json_name = "observer_name"];
  // Packets from this node seen by this observer.
  int32 packet_count = 3 [json_name = "packetCount"];
  // Average SNR for packets from this node.
  optional double avg_snr = 4 [json_name = "avgSnr"];
  // Average RSSI for packets from this node.
  optional double avg_rssi = 5 [json_name = "avgRssi"];
  // IATA region code of observer (present in node-health, absent in bulk-health).
  optional string iata = 6;
  // First time this observer saw this node (ISO 8601, present in analytics).
  optional string first_seen = 7 [json_name = "firstSeen"];
  // Last time this observer saw this node (ISO 8601, present in analytics).
  optional string last_seen = 8 [json_name = "lastSeen"];
}

// ─── Node Stats ────────────────────────────────────────────────────────────────

// Aggregate packet statistics for a node.
// Used in bulk-health entries and node health responses.
message NodeStats {
  // Unique transmissions involving this node.
  int32 total_transmissions = 1 [json_name = "totalTransmissions"];
  // Total observations (may exceed transmissions due to multi-observer).
  int32 total_observations = 2 [json_name = "totalObservations"];
  // Same as totalTransmissions (backward compat alias).
  int32 total_packets = 3 [json_name = "totalPackets"];
  // Transmissions in the last 24 hours.
  int32 packets_today = 4 [json_name = "packetsToday"];
  // Average SNR across all observations.
  optional double avg_snr = 5 [json_name = "avgSnr"];
  // Most recent packet timestamp (ISO 8601).
  optional string last_heard = 6 [json_name = "lastHeard"];
  // Average hop count (rounded integer, present in node health).
  optional double avg_hops = 7 [json_name = "avgHops"];
}

// ─── API Responses ─────────────────────────────────────────────────────────────

// GET /api/nodes — paginated node list.
message NodeListResponse {
  repeated Node nodes = 1;
  // Total matching count before pagination.
  int32 total = 2;
  // Global role counts (not filtered by current query).
  RoleCounts counts = 3;
}

// GET /api/nodes/search — quick search for autocomplete.
message NodeSearchResponse {
  // Matching nodes (subset of Node fields populated).
  repeated Node nodes = 1;
}

// GET /api/nodes/bulk-health — bulk health summary for analytics dashboard.
// NOTE: The API returns a bare JSON array with flat node fields at top level.
message BulkHealthEntry {
  // Node public key (flat, not nested in a sub-message).
  string public_key = 1 [json_name = "public_key"];
  // Node display name.
  optional string name = 2;
  // Node role: "repeater", "room", "companion", "sensor".
  optional string role = 3;
  // GPS latitude (null if unknown).
  optional double lat = 4;
  // GPS longitude (null if unknown).
  optional double lon = 5;
  // Aggregate packet stats.
  NodeStats stats = 6;
  // Per-observer signal quality.
  repeated NodeObserverStats observers = 7;
}

// Wrapper for the bulk-health array response.
message BulkHealthResponse {
  repeated BulkHealthEntry entries = 1;
}

// GET /api/nodes/network-status — aggregate health status counts.
message NetworkStatusResponse {
  // Total nodes considered.
  int32 total = 1;
  // Nodes within degradedMs threshold.
  int32 active = 2;
  // Nodes between degradedMs and silentMs.
  int32 degraded = 3;
  // Nodes beyond silentMs.
  int32 silent = 4;
  // Per-role counts (may include "unknown" key).
  map<string, int32> role_counts = 5 [json_name = "roleCounts"];
}

// GET /api/nodes/:pubkey — node detail page.
message NodeDetailResponse {
  // Full node record.
  Node node = 1;
  // Last 20 packets involving this node, newest first.
  repeated Transmission recent_adverts = 2 [json_name = "recentAdverts"];
}

// GET /api/nodes/:pubkey/health — detailed health for one node.
message NodeHealthResponse {
  // Full node record.
  Node node = 1;
  // Per-observer signal stats.
  repeated NodeObserverStats observers = 2;
  // Aggregate packet statistics.
  NodeStats stats = 3;
  // Last 20 packets (observations stripped, observation_count added).
  repeated Transmission recent_packets = 4 [json_name = "recentPackets"];
}

// ─── Path Analysis ─────────────────────────────────────────────────────────────

// Single hop in a resolved path.
message PathHop {
  // Raw hex hop prefix.
  string prefix = 1;
  // Resolved node name.
  string name = 2;
  // Full public key (null if unresolved).
  optional string pubkey = 3;
  // GPS latitude (null if unknown).
  optional double lat = 4;
  // GPS longitude (null if unknown).
  optional double lon = 5;
}

// A unique path signature with usage stats.
message PathEntry {
  // Ordered hops in this path.
  repeated PathHop hops = 1;
  // Number of times this path was seen.
  int32 count = 2;
  // Most recent usage (ISO 8601).
  optional string last_seen = 3 [json_name = "lastSeen"];
  // Hash of a sample packet using this path.
  string sample_hash = 4 [json_name = "sampleHash"];
}

// GET /api/nodes/:pubkey/paths — path analysis for a node.
message NodePathsResponse {
  // Lightweight node identification.
  Node node = 1;
  // All unique paths containing this node.
  repeated PathEntry paths = 2;
  // Number of unique path signatures.
  int32 total_paths = 3 [json_name = "totalPaths"];
  // Total transmissions with this node in path.
  int32 total_transmissions = 4 [json_name = "totalTransmissions"];
}

// ─── Node Analytics ────────────────────────────────────────────────────────────

// Time range for analytics query.
message TimeRange {
  // Start of range (ISO 8601).
  string from = 1;
  // End of range (ISO 8601).
  string to = 2;
  // Number of days in range.
  int32 days = 3;
}

// SNR trend data point.
message SnrTrendEntry {
  // Observation timestamp (ISO 8601).
  string timestamp = 1;
  // Signal-to-noise ratio (dB).
  double snr = 2;
  // Received signal strength (dBm).
  optional double rssi = 3;
  // Observer that recorded this data point.
  optional string observer_id = 4 [json_name = "observer_id"];
  optional string observer_name = 5 [json_name = "observer_name"];
}

// Payload type breakdown entry.
message PayloadTypeCount {
  // Payload type number.
  int32 payload_type = 1 [json_name = "payload_type"];
  // Number of packets of this type.
  int32 count = 2;
}

// Hop distribution entry (e.g. "0", "1", "4+").
message HopDistEntry {
  // Hop count label.
  string hops = 1;
  // Number of packets at this hop distance.
  int32 count = 2;
}

// Peer interaction summary.
message PeerInteraction {
  // Peer node public key.
  string peer_key = 1 [json_name = "peer_key"];
  // Peer node display name.
  string peer_name = 2 [json_name = "peer_name"];
  // Number of messages exchanged.
  int32 message_count = 3 [json_name = "messageCount"];
  // Most recent interaction (ISO 8601).
  string last_contact = 4 [json_name = "lastContact"];
}

// Uptime heatmap cell (day-of-week × hour-of-day).
message HeatmapCell {
  // Day of week (0=Sunday).
  int32 day_of_week = 1 [json_name = "dayOfWeek"];
  // Hour of day (0–23 UTC).
  int32 hour = 2;
  // Packet count in this cell.
  int32 count = 3;
}

// Computed analytics statistics for a node.
message ComputedNodeStats {
  // Availability percentage (0–100).
  double availability_pct = 1 [json_name = "availabilityPct"];
  // Longest silence gap in milliseconds.
  double longest_silence_ms = 2 [json_name = "longestSilenceMs"];
  // When the longest silence started (ISO 8601).
  optional string longest_silence_start = 3 [json_name = "longestSilenceStart"];
  // Overall signal grade: "A", "A-", "B+", "B", "C", "D".
  string signal_grade = 4 [json_name = "signalGrade"];
  // Mean SNR across all observations.
  double snr_mean = 5 [json_name = "snrMean"];
  // SNR standard deviation.
  double snr_std_dev = 6 [json_name = "snrStdDev"];
  // Percentage of packets with >1 hop.
  double relay_pct = 7 [json_name = "relayPct"];
  // Total packets in analytics window.
  int32 total_packets = 8 [json_name = "totalPackets"];
  // Unique observers that saw this node.
  int32 unique_observers = 9 [json_name = "uniqueObservers"];
  // Unique peer nodes interacted with.
  int32 unique_peers = 10 [json_name = "uniquePeers"];
  // Average packets per day.
  double avg_packets_per_day = 11 [json_name = "avgPacketsPerDay"];
}

// GET /api/nodes/:pubkey/analytics — per-node analytics.
message NodeAnalyticsResponse {
  // Full node record.
  Node node = 1;
  // Query time range.
  TimeRange time_range = 2 [json_name = "timeRange"];
  // Hourly activity buckets.
  repeated TimeBucket activity_timeline = 3 [json_name = "activityTimeline"];
  // SNR over time with observer attribution.
  repeated SnrTrendEntry snr_trend = 4 [json_name = "snrTrend"];
  // Packet count by payload type.
  repeated PayloadTypeCount packet_type_breakdown = 5 [json_name = "packetTypeBreakdown"];
  // Per-observer coverage with signal stats and time range.
  repeated NodeObserverStats observer_coverage = 6 [json_name = "observerCoverage"];
  // Distribution of hop counts.
  repeated HopDistEntry hop_distribution = 7 [json_name = "hopDistribution"];
  // Peer interaction summaries.
  repeated PeerInteraction peer_interactions = 8 [json_name = "peerInteractions"];
  // Day×hour activity heatmap.
  repeated HeatmapCell uptime_heatmap = 9 [json_name = "uptimeHeatmap"];
  // Derived statistics.
  ComputedNodeStats computed_stats = 10 [json_name = "computedStats"];
}

// ─── Hop Resolution ────────────────────────────────────────────────────────────

// Candidate node for an ambiguous hop prefix.
message HopCandidate {
  // Node display name.
  string name = 1;
  // Node public key.
  string pubkey = 2;
  // GPS latitude (null if unknown).
  optional double lat = 3;
  // GPS longitude (null if unknown).
  optional double lon = 4;
  // Whether this candidate is in the regional filter set.
  bool regional = 5;
  // How this candidate was selected: "geo", "observer", etc.
  string filter_method = 6 [json_name = "filterMethod"];
  // Distance in km from origin (null if no coordinates).
  optional double dist_km = 7 [json_name = "distKm"];
}

// Resolution result for a single hop prefix.
message HopResolution {
  // Resolved node name (null if unresolvable).
  optional string name = 1;
  // Resolved node public key (null if unresolvable).
  optional string pubkey = 2;
  // True if multiple candidates matched.
  optional bool ambiguous = 3;
  // True if resolution failed sanity checks.
  optional bool unreliable = 4;
  // Candidate nodes that matched.
  repeated HopCandidate candidates = 5;
  // Conflicting candidates (different from chosen).
  repeated HopCandidate conflicts = 6;
  // True if fell back to global (non-regional) resolution.
  optional bool global_fallback = 7 [json_name = "globalFallback"];
  // Method used for filtering: "geo", "observer".
  optional string filter_method = 8 [json_name = "filterMethod"];
  // Hop hash size in bytes (for ambiguous entries).
  optional int32 hop_bytes = 9 [json_name = "hopBytes"];
  // Total global candidates before filtering.
  optional int32 total_global = 10 [json_name = "totalGlobal"];
  // Total regional candidates after filtering.
  optional int32 total_regional = 11 [json_name = "totalRegional"];
  // All filter methods attempted.
  repeated string filter_methods = 12 [json_name = "filterMethods"];
}

// GET /api/resolve-hops — resolve hop prefixes to node identities.
message ResolveHopsResponse {
  // Map of hop prefix → resolution result.
  map<string, HopResolution> resolved = 1;
  // Regional context used for resolution (null if no region).
  optional string region = 2;
}