fortress-api-server 1.0.0

//! GraphQL subscription handlers
//!
//! Implements real-time subscriptions for data changes, system events,
//! and other live updates.

use crate::graphql::{
    context::from_context,
    types::*,
};
use async_graphql::{Context, Result, Subscription, ErrorExtensions};
use futures::{stream, Stream};
use chrono::Utc;

/// GraphQL subscription root
pub struct Subscription;

#[Subscription]
impl Subscription {
    // ==================== Data Change Subscriptions ====================

    /// Subscribe to data changes in a specific table
    async fn data_changes(&self, ctx: &Context<'_>, database: String, table: String) -> Result<impl Stream<Item = DataChangeEvent>> {
        let graphql_ctx = from_context(ctx)?;
        
        // Check permissions - require read access
        graphql_ctx.require_any_role(&["admin", "database_admin", "data_reader"])?;

        // Mock implementation - in production this would subscribe to actual data changes
        let stream = stream::iter(vec![
            DataChangeEvent {
                id: "550e8400-e29b-41d4-a716-446655440005".to_string(),
                event_type: DataChangeEventType::Inserted,
                table_name: table.to_string(),
                database_name: database.to_string(),
                record_id: "550e8400-e29b-41d4-a716-446655440006".to_string(),
                old_data: None,
                new_data: Some(async_graphql::Json(serde_json::json!({
                    "id": "550e8400-e29b-41d4-a716-446655440000",
                    "username": "new_user".to_string()
                }))),
                timestamp: Utc::now(),
                user_id: Some("system".to_string()),
            },
            DataChangeEvent {
                id: "550e8400-e29b-41d4-a716-446655440007".to_string(),
                event_type: DataChangeEventType::Updated,
                table_name: table.to_string(),
                database_name: database.to_string(),
                record_id: "550e8400-e29b-41d4-a716-446655440008".to_string(),
                old_data: Some(async_graphql::Json(serde_json::json!({
                    "username": "old_name".to_string()
                }))),
                new_data: Some(async_graphql::Json(serde_json::json!({
                    "username": "new_name".to_string()
                }))),
                timestamp: Utc::now(),
                user_id: Some("system".to_string()),
            },
        ]);

        Ok(stream)
    }

    /// Subscribe to database events
    async fn database_events(&self, ctx: &Context<'_>, database: Option<String>) -> Result<impl Stream<Item = DatabaseEvent>> {
        let graphql_ctx = from_context(ctx)?;
        
        // Check permissions - require admin or database_admin role
        graphql_ctx.require_any_role(&["admin", "database_admin"])?;

        // Mock implementation - in production this would subscribe to actual database events
        let stream = stream::iter(vec![
            DatabaseEvent {
                id: "550e8400-e29b-41d4-a716-446655440009".to_string(),
                event_type: DatabaseEventType::TableCreated,
                database_name: database.unwrap_or_else(|| "example_db".to_string()),
                table_name: Some("new_table".to_string()),
                details: std::collections::HashMap::from([
                    ("field_count".to_string(), "3".to_string()),
                    ("encryption_enabled".to_string(), "true".to_string()),
                ]),
                timestamp: Utc::now(),
                user_id: Some("admin".to_string()),
            },
        ]);

        Ok(stream)
    }

    // ==================== System Event Subscriptions ====================

    /// Subscribe to system health events
    async fn health_events(&self, ctx: &Context<'_>) -> Result<impl Stream<Item = HealthEvent>> {
        let graphql_ctx = from_context(ctx)?;
        
        // Check permissions - require admin role
        graphql_ctx.require_role("admin")?;

        // Mock implementation - in production this would subscribe to actual health events
        let stream = stream::iter(vec![
            HealthEvent {
                id: "550e8400-e29b-41d4-a716-446655440010".to_string(),
                event_type: HealthEventType::ServiceHealthy,
                service_name: "database".to_string(),
                status: "healthy".to_string(),
                message: Some("Database service is running normally".to_string()),
                details: std::collections::HashMap::from([
                    ("response_time_ms".to_string(), "5".to_string()),
                    ("connections".to_string(), "10".to_string()),
                ]),
                timestamp: Utc::now(),
            },
            HealthEvent {
                id: "550e8400-e29b-41d4-a716-446655440011".to_string(),
                event_type: HealthEventType::ServiceWarning,
                service_name: "cache".to_string(),
                status: "warning".to_string(),
                message: Some("Cache memory usage above 80%".to_string()),
                details: std::collections::HashMap::from([
                    ("memory_usage_percent".to_string(), "85".to_string()),
                    ("cache_size_mb".to_string(), "512".to_string()),
                ]),
                timestamp: Utc::now(),
            },
        ]);

        Ok(stream)
    }

    /// Subscribe to key rotation events
    async fn key_rotation_events(&self, ctx: &Context<'_>, database: Option<String>) -> Result<impl Stream<Item = KeyRotationEvent>> {
        let graphql_ctx = from_context(ctx)?;
        
        // Check permissions - require admin role
        graphql_ctx.require_role("admin")?;

        // Mock implementation - in production this would subscribe to actual key rotation events
        let db_name = database.as_ref().map(|s| s.as_str()).unwrap_or("example_db");
        let stream = stream::iter(vec![
            KeyRotationEvent {
                id: "550e8400-e29b-41d4-a716-446655440012".to_string(),
                rotation_id: "550e8400-e29b-41d4-a716-446655440013".to_string(),
                event_type: KeyRotationEventType::RotationStarted,
                database_name: db_name.to_string(),
                table_name: "users".to_string(),
                algorithm: Some(EncryptionAlgorithm::Aegis256),
                progress_percentage: 0.0,
                records_processed: 0,
                total_records: 100,
                message: Some("Key rotation started".to_string()),
                timestamp: Utc::now(),
            },
            KeyRotationEvent {
                id: "550e8400-e29b-41d4-a716-446655440014".to_string(),
                rotation_id: "550e8400-e29b-41d4-a716-446655440013".to_string(),
                event_type: KeyRotationEventType::RotationProgress,
                database_name: db_name.to_string(),
                table_name: "users".to_string(),
                algorithm: Some(EncryptionAlgorithm::Aegis256),
                progress_percentage: 50.0,
                records_processed: 50,
                total_records: 100,
                message: Some("Key rotation 50% complete".to_string()),
                timestamp: Utc::now(),
            },
            KeyRotationEvent {
                id: "550e8400-e29b-41d4-a716-446655440015".to_string(),
                rotation_id: "550e8400-e29b-41d4-a716-446655440013".to_string(),
                event_type: KeyRotationEventType::RotationCompleted,
                database_name: db_name.to_string(),
                table_name: "users".to_string(),
                algorithm: Some(EncryptionAlgorithm::Aegis256),
                progress_percentage: 100.0,
                records_processed: 100,
                total_records: 100,
                message: Some("Key rotation completed successfully".to_string()),
                timestamp: Utc::now(),
            },
        ]);

        Ok(stream)
    }

    // ==================== Audit Event Subscriptions ====================

    /// Subscribe to audit events
    async fn audit_events(&self, ctx: &Context<'_>, user_id: Option<String>) -> Result<impl Stream<Item = AuditEvent>> {
        let graphql_ctx = from_context(ctx)?;
        
        // Check permissions - require admin role or self-audit
        if let Some(current_user) = &graphql_ctx.user {
            if current_user.roles.contains(&"admin".to_string()) || 
               user_id.as_ref() == Some(&current_user.id) {
                // Allowed
            } else {
                return Err(async_graphql::Error::new("Insufficient permissions for audit access")
                    .extend_with(|_, e| e.set("code", "INSUFFICIENT_PERMISSIONS")));
            }
        } else {
            return Err(async_graphql::Error::new("Authentication required")
                .extend_with(|_, e| e.set("code", "AUTH_REQUIRED")));
        }

        // Mock implementation - in production this would subscribe to actual audit events
        let user_name = user_id.as_ref().map(|s| s.as_str()).unwrap_or("current_user");
        let stream = stream::iter(vec![
            AuditEvent {
                id: "550e8400-e29b-41d4-a716-446655440016".to_string(),
                event_type: AuditEventType::UserLogin,
                user_id: user_name.to_string(),
                action: "login".to_string(),
                resource: Some("auth".to_string()),
                details: std::collections::HashMap::from([
                    ("ip_address".to_string(), "192.168.1.100".to_string()),
                    ("user_agent".to_string(), "Mozilla/5.0".to_string()),
                ]),
                timestamp: Utc::now(),
                success: true,
                error_message: None,
            },
            AuditEvent {
                id: "550e8400-e29b-41d4-a716-446655440017".to_string(),
                event_type: AuditEventType::DataAccess,
                user_id: user_name.to_string(),
                action: "select".to_string(),
                resource: Some("example_db.users".to_string()),
                details: std::collections::HashMap::from([
                    ("query".to_string(), "SELECT * FROM users".to_string()),
                    ("records_returned".to_string(), "10".to_string()),
                ]),
                timestamp: Utc::now(),
                success: true,
                error_message: None,
            },
        ]);

        Ok(stream)
    }

    // ==================== Performance Subscriptions ====================

    /// Subscribe to performance metrics
    async fn performance_metrics(&self, ctx: &Context<'_>) -> Result<impl Stream<Item = PerformanceMetrics>> {
        let graphql_ctx = from_context(ctx)?;
        
        // Check permissions - require admin or monitoring role
        graphql_ctx.require_any_role(&["admin", "monitoring"])?;

        // Mock implementation - in production this would stream actual performance metrics
        let stream = stream::iter(vec![
            PerformanceMetrics {
                timestamp: Utc::now(),
                cpu_usage_percent: 25.5,
                memory_usage_percent: 45.2,
                disk_usage_percent: 30.8,
                network_io_bytes_per_second: 1024 * 1024, // 1MB/s
                database_connections: 15,
                active_queries: 3,
                cache_hit_rate: 85.5,
                average_response_time_ms: 25.3,
                requests_per_second: 125.7,
            },
            PerformanceMetrics {
                timestamp: Utc::now(),
                cpu_usage_percent: 28.1,
                memory_usage_percent: 47.8,
                disk_usage_percent: 31.2,
                network_io_bytes_per_second: 2 * 1024 * 1024, // 2MB/s
                database_connections: 18,
                active_queries: 5,
                cache_hit_rate: 87.2,
                average_response_time_ms: 28.9,
                requests_per_second: 142.3,
            },
        ]);

        Ok(stream)
    }
}

// ==================== Event Types ====================

/// Data change event types
#[derive(async_graphql::Enum, Clone, Debug, Copy, PartialEq, Eq)]
pub enum DataChangeEventType {
    /// Record was inserted
    Inserted,
    /// Record was updated
    Updated,
    /// Record was deleted
    Deleted,
}

/// Database event types
#[derive(async_graphql::Enum, Clone, Debug, Copy, PartialEq, Eq)]
pub enum DatabaseEventType {
    /// Database was created
    DatabaseCreated,
    /// Database was deleted
    DatabaseDeleted,
    /// Table was created
    TableCreated,
    /// Table was dropped
    TableDropped,
    /// Schema was modified
    SchemaModified,
}

/// Health event types
#[derive(async_graphql::Enum, Clone, Debug, Copy, PartialEq, Eq)]
pub enum HealthEventType {
    /// Service is healthy
    ServiceHealthy,
    /// Service has a warning
    ServiceWarning,
    /// Service is unhealthy
    ServiceUnhealthy,
    /// Service recovered
    ServiceRecovered,
}

/// Key rotation event types
#[derive(async_graphql::Enum, Clone, Debug, Copy, PartialEq, Eq)]
pub enum KeyRotationEventType {
    /// Rotation started
    RotationStarted,
    /// Rotation in progress
    RotationProgress,
    /// Rotation completed
    RotationCompleted,
    /// Rotation failed
    RotationFailed,
}

/// Audit event types
#[derive(async_graphql::Enum, Clone, Debug, Copy, PartialEq, Eq)]
pub enum AuditEventType {
    /// User login
    UserLogin,
    /// User logout
    UserLogout,
    /// Data access
    DataAccess,
    /// Data modification
    DataModification,
    /// Configuration change
    ConfigurationChange,
    /// Security event
    SecurityEvent,
}

// ==================== Event Objects ====================

/// Data change event
#[derive(async_graphql::SimpleObject, Clone, Debug)]
pub struct DataChangeEvent {
    /// Event ID
    pub id: String,
    /// Event type
    pub event_type: DataChangeEventType,
    /// Table name
    pub table_name: String,
    /// Database name
    pub database_name: String,
    /// Record ID
    pub record_id: String,
    /// Old data (for updates)
    pub old_data: Option<async_graphql::Json<serde_json::Value>>,
    /// New data
    pub new_data: Option<async_graphql::Json<serde_json::Value>>,
    /// Event timestamp
    pub timestamp: chrono::DateTime<chrono::Utc>,
    /// User ID who triggered the event
    pub user_id: Option<String>,
}

/// Database event
#[derive(async_graphql::SimpleObject, Clone, Debug)]
pub struct DatabaseEvent {
    /// Event ID
    pub id: String,
    /// Event type
    pub event_type: DatabaseEventType,
    /// Database name
    pub database_name: String,
    /// Table name (if applicable)
    pub table_name: Option<String>,
    /// Event details
    pub details: std::collections::HashMap<String, String>,
    /// Event timestamp
    pub timestamp: chrono::DateTime<chrono::Utc>,
    /// User ID who triggered the event
    pub user_id: Option<String>,
}

/// Health event
#[derive(async_graphql::SimpleObject, Clone, Debug)]
pub struct HealthEvent {
    /// Event ID
    pub id: String,
    /// Event type
    pub event_type: HealthEventType,
    /// Service name
    pub service_name: String,
    /// Service status
    pub status: String,
    /// Event message
    pub message: Option<String>,
    /// Event details
    pub details: std::collections::HashMap<String, String>,
    /// Event timestamp
    pub timestamp: chrono::DateTime<chrono::Utc>,
}

/// Key rotation event
#[derive(async_graphql::SimpleObject, Clone, Debug)]
pub struct KeyRotationEvent {
    /// Event ID
    pub id: String,
    /// Rotation ID
    pub rotation_id: String,
    /// Event type
    pub event_type: KeyRotationEventType,
    /// Database name
    pub database_name: String,
    /// Table name
    pub table_name: String,
    /// Encryption algorithm
    pub algorithm: Option<EncryptionAlgorithm>,
    /// Progress percentage
    pub progress_percentage: f64,
    /// Records processed
    pub records_processed: i32,
    /// Total records to process
    pub total_records: i32,
    /// Event message
    pub message: Option<String>,
    /// Event timestamp
    pub timestamp: chrono::DateTime<chrono::Utc>,
}

/// Audit event
#[derive(async_graphql::SimpleObject, Clone, Debug)]
pub struct AuditEvent {
    /// Event ID
    pub id: String,
    /// Event type
    pub event_type: AuditEventType,
    /// User ID who performed the action
    pub user_id: String,
    /// Action performed
    pub action: String,
    /// Resource affected (if any)
    pub resource: Option<String>,
    /// Event details
    pub details: std::collections::HashMap<String, String>,
    /// Event timestamp
    pub timestamp: chrono::DateTime<chrono::Utc>,
    /// Whether the action was successful
    pub success: bool,
    /// Error message (if any)
    pub error_message: Option<String>,
}

/// Performance metrics
#[derive(async_graphql::SimpleObject, Clone, Debug)]
pub struct PerformanceMetrics {
    /// Metrics timestamp
    pub timestamp: chrono::DateTime<chrono::Utc>,
    /// CPU usage percentage
    pub cpu_usage_percent: f64,
    /// Memory usage percentage
    pub memory_usage_percent: f64,
    /// Disk usage percentage
    pub disk_usage_percent: f64,
    /// Network I/O bytes per second
    pub network_io_bytes_per_second: i64,
    /// Number of database connections
    pub database_connections: i32,
    /// Number of active queries
    pub active_queries: i32,
    /// Cache hit rate percentage
    pub cache_hit_rate: f64,
    /// Average response time in milliseconds
    pub average_response_time_ms: f64,
    /// Requests per second
    pub requests_per_second: f64,
}