syntax = "proto3";

package monitoring;

// Monitoring Service provides comprehensive system health monitoring, performance metrics collection,
// alerting capabilities, and training metrics for the HFT trading system. This service tracks latency,
// throughput, resource utilization, service health, and ML training progress across all components
// with real-time alerting and streaming.
service MonitoringService {
  // Health and Status Monitoring
  // Get overall system status and individual service health
  rpc GetSystemStatus(GetSystemStatusRequest) returns (GetSystemStatusResponse);

  // Stream real-time system status changes
  rpc StreamSystemStatus(StreamSystemStatusRequest) returns (stream SystemStatusEvent);

  // Perform detailed health checks on services
  rpc GetHealthCheck(GetHealthCheckRequest) returns (GetHealthCheckResponse);

  // Performance Metrics Collection
  // Get system and application metrics
  rpc GetMetrics(GetMetricsRequest) returns (GetMetricsResponse);

  // Stream real-time performance metrics
  rpc StreamMetrics(StreamMetricsRequest) returns (stream MetricsEvent);

  // Get detailed latency performance metrics
  rpc GetLatencyMetrics(GetLatencyMetricsRequest) returns (GetLatencyMetricsResponse);

  // Get throughput and capacity metrics
  rpc GetThroughputMetrics(GetThroughputMetricsRequest) returns (GetThroughputMetricsResponse);

  // Alerting and Notification System
  // Stream real-time system alerts and notifications
  rpc StreamAlerts(StreamAlertsRequest) returns (stream AlertEvent);

  // Acknowledge an active alert
  rpc AcknowledgeAlert(AcknowledgeAlertRequest) returns (AcknowledgeAlertResponse);

  // Get all currently active alerts
  rpc GetActiveAlerts(GetActiveAlertsRequest) returns (GetActiveAlertsResponse);

  // Training Metrics (from monitoring_service)
  // Single snapshot of all active training sessions
  rpc GetLiveTrainingMetrics(GetLiveTrainingMetricsRequest)
      returns (GetLiveTrainingMetricsResponse);

  // Server-streaming: pushes updates every N seconds
  rpc StreamTrainingMetrics(StreamTrainingMetricsRequest)
      returns (stream GetLiveTrainingMetricsResponse);

  // Epoch history for a specific session (ring buffer, max 50 epochs)
  rpc GetEpochHistory(GetEpochHistoryRequest)
      returns (GetEpochHistoryResponse);

  // Kubernetes pod status — streams every N seconds
  rpc SubscribeClusterPods(SubscribeClusterPodsRequest) returns (stream ClusterPodsResponse);
}

// ============================================================================
// Health and Status Messages
// ============================================================================

message GetSystemStatusRequest {
  repeated string service_names = 1;
}

message GetSystemStatusResponse {
  SystemStatus overall_status = 1;
  repeated ServiceStatus service_statuses = 2;
  int64 timestamp = 3;
}

message StreamSystemStatusRequest {
  repeated string service_names = 1;
  optional int32 update_frequency_seconds = 2;
}

message GetHealthCheckRequest {
  optional string service_name = 1;
}

message GetHealthCheckResponse {
  HealthStatus health_status = 1;
  repeated HealthCheck health_checks = 2;
  int64 timestamp = 3;
}

// ============================================================================
// Performance Metrics Messages
// ============================================================================

message GetMetricsRequest {
  repeated string metric_names = 1;
  optional int64 start_time = 2;
  optional int64 end_time = 3;
  optional MetricAggregation aggregation = 4;
}

message GetMetricsResponse {
  repeated Metric metrics = 1;
  int64 timestamp = 2;
}

message StreamMetricsRequest {
  repeated string metric_names = 1;
  optional int32 update_frequency_seconds = 2;
}

message GetLatencyMetricsRequest {
  optional string service_name = 1;
  optional string operation_name = 2;
  optional int64 start_time = 3;
  optional int64 end_time = 4;
}

message GetLatencyMetricsResponse {
  repeated LatencyMetric latency_metrics = 1;
}

message GetThroughputMetricsRequest {
  optional string service_name = 1;
  optional string operation_name = 2;
  optional int64 start_time = 3;
  optional int64 end_time = 4;
}

message GetThroughputMetricsResponse {
  repeated ThroughputMetric throughput_metrics = 1;
}

// ============================================================================
// Alert Messages
// ============================================================================

message StreamAlertsRequest {
  optional AlertSeverity min_severity = 1;
  repeated string service_names = 2;
  repeated AlertType alert_types = 3;
}

message AcknowledgeAlertRequest {
  string alert_id = 1;
  string acknowledged_by = 2;
  optional string note = 3;
}

message AcknowledgeAlertResponse {
  bool success = 1;
  string message = 2;
  int64 timestamp = 3;
}

message GetActiveAlertsRequest {
  optional AlertSeverity min_severity = 1;
  repeated string service_names = 2;
}

message GetActiveAlertsResponse {
  repeated Alert active_alerts = 1;
  int32 total_count = 2;
}

// ============================================================================
// Core Data Types (System Health)
// ============================================================================

message ServiceStatus {
  string service_name = 1;
  ServiceHealth health = 2;
  ServiceState state = 3;
  optional string version = 4;
  optional string error_message = 5;
  int64 uptime_seconds = 6;
  int64 last_health_check = 7;
  map<string, string> metadata = 8;
  repeated Dependency dependencies = 9;
}

message SystemStatus {
  SystemHealth overall_health = 1;
  int32 healthy_services = 2;
  int32 total_services = 3;
  repeated string critical_issues = 4;
  int64 system_uptime_seconds = 5;
  SystemMetrics system_metrics = 6;
}

message HealthCheck {
  string check_name = 1;
  HealthStatus status = 2;
  optional string message = 3;
  optional double response_time_ms = 4;
  int64 last_checked = 5;
  map<string, string> details = 6;
}

message Dependency {
  string name = 1;
  DependencyType dependency_type = 2;
  HealthStatus status = 3;
  optional string endpoint = 4;
  optional double response_time_ms = 5;
  int64 last_checked = 6;
}

message SystemMetrics {
  double cpu_usage_percent = 1;
  double memory_usage_percent = 2;
  double disk_usage_percent = 3;
  double network_io_mbps = 4;
  int32 active_connections = 5;
  int32 total_requests = 6;
  double avg_response_time_ms = 7;
  double error_rate_percent = 8;
}

message Metric {
  string name = 1;
  MetricType metric_type = 2;
  double value = 3;
  string unit = 4;
  map<string, string> labels = 5;
  int64 timestamp = 6;
  optional MetricStatistics statistics = 7;
}

message MetricStatistics {
  double min = 1;
  double max = 2;
  double avg = 3;
  double percentile_95 = 4;
  double percentile_99 = 5;
  double std_dev = 6;
  int32 sample_count = 7;
}

message LatencyMetric {
  string service_name = 1;
  string operation_name = 2;
  double avg_latency_ms = 3;
  double p50_latency_ms = 4;
  double p95_latency_ms = 5;
  double p99_latency_ms = 6;
  double max_latency_ms = 7;
  int32 request_count = 8;
  int64 time_window_start = 9;
  int64 time_window_end = 10;
}

message ThroughputMetric {
  string service_name = 1;
  string operation_name = 2;
  double requests_per_second = 3;
  double bytes_per_second = 4;
  int32 total_requests = 5;
  int64 total_bytes = 6;
  int64 time_window_start = 7;
  int64 time_window_end = 8;
}

message Alert {
  string alert_id = 1;
  AlertType alert_type = 2;
  AlertSeverity severity = 3;
  string title = 4;
  string description = 5;
  string service_name = 6;
  map<string, string> labels = 7;
  int64 triggered_at = 8;
  optional int64 acknowledged_at = 9;
  optional string acknowledged_by = 10;
  optional int64 resolved_at = 11;
  AlertStatus status = 12;
  optional string resolution_note = 13;
}

// ============================================================================
// Event Messages (System Health)
// ============================================================================

message SystemStatusEvent {
  SystemStatus system_status = 1;
  SystemStatusChangeType change_type = 2;
  int64 timestamp = 3;
}

message MetricsEvent {
  repeated Metric metrics = 1;
  int64 timestamp = 2;
}

message AlertEvent {
  Alert alert = 1;
  AlertEventType event_type = 2;
  int64 timestamp = 3;
}

// ============================================================================
// Training Metrics Messages (from monitoring_service)
// ============================================================================

message GetLiveTrainingMetricsRequest {
  string model_filter = 1;  // optional: "dqn", "ppo", etc.
}

message StreamTrainingMetricsRequest {
  string model_filter = 1;
  uint32 interval_seconds = 2;  // 0 = server default (3s)
}

message GetLiveTrainingMetricsResponse {
  repeated TrainingSession sessions = 1;
  GpuSnapshot gpu = 2;
  uint32 active_k8s_jobs = 3;
  int64 timestamp = 4;
  float cpu_percent = 5;
  float memory_used_mb = 6;
  float memory_total_mb = 7;
}

message TrainingSession {
  string model = 1;
  string fold = 2;
  bool is_hyperopt = 3;

  // Epoch/progress
  float current_epoch = 4;
  float epoch_loss = 5;
  float validation_loss = 6;

  // Throughput
  float batches_per_second = 7;
  float batches_processed = 8;
  float iteration_seconds = 9;

  // Eval metrics
  float eval_accuracy = 10;
  float eval_precision = 11;
  float eval_recall = 12;
  float eval_f1 = 13;

  // Checkpoint
  float checkpoint_size_bytes = 14;
  uint32 checkpoint_saves = 15;
  uint32 checkpoint_failures = 16;

  // Health counters
  uint32 nan_detected = 17;
  uint32 gradient_explosions = 18;
  uint32 feature_errors = 19;

  // Hyperopt fields (populated when is_hyperopt=true)
  uint32 hyperopt_trial_current = 20;
  uint32 hyperopt_trial_total = 21;
  float hyperopt_best_objective = 22;
  uint32 hyperopt_trials_failed = 23;

  // RL diagnostics
  float q_value_mean = 24;
  float q_value_max = 25;
  float policy_entropy = 26;
  float kl_divergence = 27;
  float advantage_mean = 28;
  uint32 replay_buffer_size = 29;

  // Gradient & training health
  float gradient_norm = 30;
  float learning_rate = 31;
  float epoch_duration_seconds = 32;

  // Hyperopt intra-trial
  uint32 hyperopt_trial_epoch = 33;
  float hyperopt_trial_best_loss = 34;
  float hyperopt_elapsed_seconds = 35;

  // Epoch-level financial metrics
  float epoch_sharpe = 36;
  float epoch_sortino = 37;
  float epoch_win_rate = 38;
  float epoch_max_drawdown = 39;
  float epoch_profit_factor = 40;
  float epoch_total_return = 41;
  float epoch_avg_return = 42;
  uint32 epoch_total_trades = 43;
  // Action distribution
  float action_buy_pct = 44;
  float action_sell_pct = 45;
  float action_hold_pct = 46;
}

message GpuSnapshot {
  float utilization_percent = 1;
  float memory_used_mb = 2;
  float memory_total_mb = 3;
  float temperature_celsius = 4;
  float power_watts = 5;
}

message GetEpochHistoryRequest {
  string model = 1;
  string fold = 2;
  uint32 max_epochs = 3;  // 0 = all (up to 50)
}

message EpochFinancialSnapshot {
  uint32 epoch = 1;
  float sharpe = 2;
  float sortino = 3;
  float win_rate = 4;
  float max_drawdown = 5;
  float profit_factor = 6;
  float total_return = 7;
  float avg_return = 8;
  uint32 total_trades = 9;
  float loss = 10;
  float val_loss = 11;
  float learning_rate = 12;
  float action_buy_pct = 13;
  float action_sell_pct = 14;
  float action_hold_pct = 15;
}

message GetEpochHistoryResponse {
  string model = 1;
  string fold = 2;
  repeated EpochFinancialSnapshot epochs = 3;
}

// ============================================================================
// Cluster Pod Messages
// ============================================================================

message SubscribeClusterPodsRequest {
  uint32 interval_seconds = 1;  // 0 = server default (5s)
}

message ClusterPodsResponse {
  repeated PodInfo pods = 1;
  int64 timestamp = 2;
}

message PodInfo {
  string name = 1;
  string service = 2;         // app.kubernetes.io/name label
  string namespace = 3;
  string status = 4;          // Running/Pending/CrashLoopBackOff/Completed/etc
  int32 restarts = 5;
  string age = 6;             // human-readable: "2d5h", "3m"
  string node = 7;
  bool ready = 8;
  string version = 9;         // from FOXHUNT_BUILD_VERSION env or empty
}

// ============================================================================
// Enums
// ============================================================================

// Health status levels for services
enum ServiceHealth {
  SERVICE_HEALTH_UNSPECIFIED = 0;       // Default/unknown health
  SERVICE_HEALTH_HEALTHY = 1;           // Service operating normally
  SERVICE_HEALTH_DEGRADED = 2;          // Service performance degraded
  SERVICE_HEALTH_UNHEALTHY = 3;         // Service not functioning properly
  SERVICE_HEALTH_CRITICAL = 4;          // Service in critical failure state
}

// Operational states of services
enum ServiceState {
  SERVICE_STATE_UNSPECIFIED = 0;        // Default/unknown state
  SERVICE_STATE_STARTING = 1;           // Service is starting up
  SERVICE_STATE_RUNNING = 2;            // Service is running normally
  SERVICE_STATE_STOPPING = 3;           // Service is shutting down
  SERVICE_STATE_STOPPED = 4;            // Service is stopped
  SERVICE_STATE_ERROR = 5;              // Service encountered an error
}

enum SystemHealth {
  SYSTEM_HEALTH_UNSPECIFIED = 0;
  SYSTEM_HEALTH_HEALTHY = 1;
  SYSTEM_HEALTH_DEGRADED = 2;
  SYSTEM_HEALTH_UNHEALTHY = 3;
  SYSTEM_HEALTH_CRITICAL = 4;
}

enum HealthStatus {
  HEALTH_STATUS_UNSPECIFIED = 0;
  HEALTH_STATUS_HEALTHY = 1;
  HEALTH_STATUS_DEGRADED = 2;
  HEALTH_STATUS_UNHEALTHY = 3;
  HEALTH_STATUS_CRITICAL = 4;
}

enum DependencyType {
  DEPENDENCY_TYPE_UNSPECIFIED = 0;
  DEPENDENCY_TYPE_DATABASE = 1;
  DEPENDENCY_TYPE_MESSAGE_QUEUE = 2;
  DEPENDENCY_TYPE_CACHE = 3;
  DEPENDENCY_TYPE_EXTERNAL_API = 4;
  DEPENDENCY_TYPE_FILE_SYSTEM = 5;
  DEPENDENCY_TYPE_NETWORK = 6;
}

enum MetricType {
  METRIC_TYPE_UNSPECIFIED = 0;
  METRIC_TYPE_COUNTER = 1;
  METRIC_TYPE_GAUGE = 2;
  METRIC_TYPE_HISTOGRAM = 3;
  METRIC_TYPE_TIMER = 4;
}

enum MetricAggregation {
  METRIC_AGGREGATION_UNSPECIFIED = 0;
  METRIC_AGGREGATION_SUM = 1;
  METRIC_AGGREGATION_AVG = 2;
  METRIC_AGGREGATION_MIN = 3;
  METRIC_AGGREGATION_MAX = 4;
  METRIC_AGGREGATION_COUNT = 5;
}

enum AlertType {
  ALERT_TYPE_UNSPECIFIED = 0;
  ALERT_TYPE_HEALTH_CHECK = 1;
  ALERT_TYPE_PERFORMANCE = 2;
  ALERT_TYPE_ERROR_RATE = 3;
  ALERT_TYPE_LATENCY = 4;
  ALERT_TYPE_THROUGHPUT = 5;
  ALERT_TYPE_RESOURCE_USAGE = 6;
  ALERT_TYPE_DEPENDENCY = 7;
  ALERT_TYPE_SECURITY = 8;
}

// Alert severity levels
enum AlertSeverity {
  ALERT_SEVERITY_UNSPECIFIED = 0;       // Default/unknown severity
  ALERT_SEVERITY_INFO = 1;              // Informational alert
  ALERT_SEVERITY_WARNING = 2;           // Warning requiring attention
  ALERT_SEVERITY_CRITICAL = 3;          // Critical issue requiring immediate action
  ALERT_SEVERITY_EMERGENCY = 4;         // Emergency requiring immediate response
}

// Current status of alerts
enum AlertStatus {
  ALERT_STATUS_UNSPECIFIED = 0;         // Default/unknown status
  ALERT_STATUS_ACTIVE = 1;              // Alert is currently active
  ALERT_STATUS_ACKNOWLEDGED = 2;        // Alert has been acknowledged
  ALERT_STATUS_RESOLVED = 3;            // Alert has been resolved
  ALERT_STATUS_SUPPRESSED = 4;          // Alert is temporarily suppressed
}

enum SystemStatusChangeType {
  SYSTEM_STATUS_CHANGE_TYPE_UNSPECIFIED = 0;
  SYSTEM_STATUS_CHANGE_TYPE_HEALTH_IMPROVED = 1;
  SYSTEM_STATUS_CHANGE_TYPE_HEALTH_DEGRADED = 2;
  SYSTEM_STATUS_CHANGE_TYPE_SERVICE_STARTED = 3;
  SYSTEM_STATUS_CHANGE_TYPE_SERVICE_STOPPED = 4;
  SYSTEM_STATUS_CHANGE_TYPE_SERVICE_ERROR = 5;
}

enum AlertEventType {
  ALERT_EVENT_TYPE_UNSPECIFIED = 0;
  ALERT_EVENT_TYPE_TRIGGERED = 1;
  ALERT_EVENT_TYPE_ACKNOWLEDGED = 2;
  ALERT_EVENT_TYPE_RESOLVED = 3;
  ALERT_EVENT_TYPE_ESCALATED = 4;
}