kindly-guard-server 0.11.14

// Copyright 2025 Kindly Software Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! Enhanced audit logger implementation (stub)
//!
//! This module provides a stub for the enhanced audit logger that would
//! integrate with advanced audit systems.

use anyhow::Result;
use async_trait::async_trait;
use chrono::{DateTime, Utc};
use std::sync::Arc;
use std::time::Duration;
use tracing::info;

use super::*;

/// Enhanced audit logger with advanced features
///
/// This implementation would integrate with:
/// - Cryptographic signing for tamper-proof logs
/// - Distributed storage for high availability
/// - Real-time alerting for critical events
/// - Advanced analytics and anomaly detection
#[allow(dead_code)]
pub struct EnhancedAuditLogger {
    config: AuditConfig,
    // In real implementation:
    // crypto_signer: Arc<dyn AuditSigner>,
    // distributed_store: Arc<dyn DistributedStore>,
    // alert_manager: Arc<dyn AlertManager>,
    // analytics_engine: Arc<dyn AnalyticsEngine>,
}

impl EnhancedAuditLogger {
    /// Create new enhanced audit logger
    pub fn new(config: AuditConfig) -> Result<Self> {
        info!("Initializing enhanced audit logger with advanced features");

        // In real implementation:
        // - Initialize cryptographic signing
        // - Connect to distributed storage
        // - Set up alert channels
        // - Initialize analytics engine

        Ok(Self { config })
    }
}

#[async_trait]
impl AuditLogger for EnhancedAuditLogger {
    async fn log(&self, event: AuditEvent) -> Result<AuditEventId> {
        // Enhanced implementation would:
        // 1. Sign the event for integrity
        // 2. Store in distributed system
        // 3. Check for alert conditions
        // 4. Update analytics metrics

        info!("Enhanced audit logging for event: {:?}", event.event_type);
        Ok(event.id)
    }

    async fn log_batch(&self, events: Vec<AuditEvent>) -> Result<Vec<AuditEventId>> {
        // Batch processing with optimizations
        info!("Enhanced batch audit logging for {} events", events.len());
        Ok(events.into_iter().map(|e| e.id).collect())
    }

    async fn query(&self, filter: AuditFilter) -> Result<Vec<AuditEvent>> {
        // Query from distributed storage with caching
        info!("Enhanced audit query with filter: {:?}", filter);
        Ok(Vec::new())
    }

    async fn get_event(&self, id: &AuditEventId) -> Result<Option<AuditEvent>> {
        // Retrieve with signature verification
        info!("Enhanced audit event retrieval: {}", id.0);
        Ok(None)
    }

    async fn delete_before(&self, timestamp: DateTime<Utc>) -> Result<u64> {
        // Secure deletion with audit trail
        info!("Enhanced audit deletion before: {}", timestamp);
        Ok(0)
    }

    async fn get_stats(&self) -> Result<AuditStats> {
        // Real-time statistics from analytics engine
        Ok(AuditStats::default())
    }

    async fn export(&self, filter: AuditFilter, format: ExportFormat) -> Result<Vec<u8>> {
        // Export with signature and encryption
        info!("Enhanced audit export in format: {:?}", format);
        Ok(Vec::new())
    }

    async fn verify_integrity(&self) -> Result<IntegrityReport> {
        // Cryptographic verification of audit trail
        Ok(IntegrityReport {
            intact: true,
            events_checked: 0,
            issues: Vec::new(),
            verified_at: Utc::now(),
        })
    }
}

// Additional traits that would be used in real implementation:

/// Cryptographic signing for audit events
#[async_trait]
trait AuditSigner: Send + Sync {
    async fn sign_event(&self, event: &AuditEvent) -> Result<Vec<u8>>;
    async fn verify_signature(&self, event: &AuditEvent, signature: &[u8]) -> Result<bool>;
}

/// Distributed storage for audit events
#[async_trait]
trait DistributedStore: Send + Sync {
    async fn store(&self, event: &AuditEvent, signature: &[u8]) -> Result<()>;
    async fn retrieve(&self, id: &AuditEventId) -> Result<Option<(AuditEvent, Vec<u8>)>>;
    async fn query(&self, filter: &AuditFilter) -> Result<Vec<(AuditEvent, Vec<u8>)>>;
}

/// Alert manager for critical events
#[async_trait]
trait AlertManager: Send + Sync {
    async fn check_alert_conditions(&self, event: &AuditEvent) -> Result<bool>;
    async fn send_alert(&self, event: &AuditEvent, channels: &[String]) -> Result<()>;
}

/// Analytics engine for audit insights
#[async_trait]
trait AnalyticsEngine: Send + Sync {
    async fn process_event(&self, event: &AuditEvent) -> Result<()>;
    async fn detect_anomalies(&self, window: Duration) -> Result<Vec<AnomalyReport>>;
    async fn generate_insights(&self) -> Result<InsightsReport>;
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct AnomalyReport {
    timestamp: DateTime<Utc>,
    anomaly_type: String,
    confidence: f64,
    affected_clients: Vec<String>,
    description: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct InsightsReport {
    generated_at: DateTime<Utc>,
    period_start: DateTime<Utc>,
    period_end: DateTime<Utc>,
    key_metrics: HashMap<String, f64>,
    trends: Vec<TrendAnalysis>,
    recommendations: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct TrendAnalysis {
    metric: String,
    direction: TrendDirection,
    change_percentage: f64,
    significance: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
enum TrendDirection {
    Increasing,
    Decreasing,
    Stable,
}

// Note: The actual implementation would use enhanced features
// This stub maintains the trait-based architecture pattern