auth-framework 0.4.2

// Production deployment module for role-system v1.0
// Comprehensive deployment automation, health checks, monitoring integration, and performance optimization

use serde::{Deserialize, Serialize};
use std::time::{Duration, SystemTime, UNIX_EPOCH};
use thiserror::Error;

pub mod automation;
pub mod config;
pub mod health;
pub mod monitoring;
pub mod scaling;

#[derive(Debug, Error)]
pub enum DeploymentError {
    #[error("Configuration error: {0}")]
    Configuration(String),
    #[error("Health check failed: {0}")]
    HealthCheck(String),
    #[error("Monitoring integration error: {0}")]
    Monitoring(String),
    #[error("Automation error: {0}")]
    Automation(String),
    #[error("Scaling error: {0}")]
    Scaling(String),
    #[error("Performance optimization error: {0}")]
    Performance(String),
    #[error("IO error: {0}")]
    Io(#[from] std::io::Error),
    #[error("Serialization error: {0}")]
    Serialization(#[from] serde_json::Error),
}

/// Deployment status for production environment
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum DeploymentStatus {
    Initializing,
    Configuring,
    HealthChecking,
    Deploying,
    Running,
    Scaling,
    Monitoring,
    Failed(String),
    Stopped,
}

/// Production deployment configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DeploymentConfig {
    pub environment: DeploymentEnvironment,
    pub scaling: ScalingConfig,
    pub monitoring: MonitoringConfig,
    pub health_checks: HealthCheckConfig,
    pub automation: AutomationConfig,
    pub performance: PerformanceConfig,
    pub created_at: u64,
    pub updated_at: u64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum DeploymentEnvironment {
    Development,
    Staging,
    Production,
    Testing,
    Custom(String),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ScalingConfig {
    pub min_instances: u32,
    pub max_instances: u32,
    pub cpu_threshold: f64,
    pub memory_threshold: f64,
    pub auto_scale: bool,
    pub scale_up_cooldown: Duration,
    pub scale_down_cooldown: Duration,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MonitoringConfig {
    pub enabled: bool,
    pub metrics_endpoint: String,
    pub logs_endpoint: String,
    pub alert_endpoints: Vec<String>,
    pub retention_period: Duration,
    pub sample_rate: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HealthCheckConfig {
    pub enabled: bool,
    pub interval: Duration,
    pub timeout: Duration,
    pub healthy_threshold: u32,
    pub unhealthy_threshold: u32,
    pub endpoints: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AutomationConfig {
    pub enabled: bool,
    pub deployment_strategy: DeploymentStrategy,
    pub rollback_enabled: bool,
    pub rollback_threshold: f64,
    pub ci_cd_integration: bool,
    pub automated_tests: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum DeploymentStrategy {
    BlueGreen,
    RollingUpdate,
    Canary,
    Recreate,
    Custom(String),
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PerformanceConfig {
    pub optimization_level: OptimizationLevel,
    pub cache_config: CacheConfig,
    pub connection_pool: ConnectionPoolConfig,
    pub memory_limits: MemoryLimits,
    pub cpu_limits: CpuLimits,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum OptimizationLevel {
    Development,
    Testing,
    Production,
    Maximum,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheConfig {
    pub enabled: bool,
    pub max_size: usize,
    pub ttl: Duration,
    pub eviction_policy: EvictionPolicy,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum EvictionPolicy {
    LRU,
    LFU,
    FIFO,
    Random,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConnectionPoolConfig {
    pub min_connections: u32,
    pub max_connections: u32,
    pub idle_timeout: Duration,
    pub max_lifetime: Duration,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryLimits {
    pub heap_size: Option<usize>,
    pub stack_size: Option<usize>,
    pub gc_threshold: Option<usize>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CpuLimits {
    pub max_cores: Option<u32>,
    pub cpu_quota: Option<f64>,
    pub thread_pool_size: Option<u32>,
}

/// Deployment metrics for monitoring
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DeploymentMetrics {
    pub status: DeploymentStatus,
    pub uptime: Duration,
    pub cpu_usage: f64,
    pub memory_usage: f64,
    pub request_count: u64,
    pub error_rate: f64,
    pub response_time: Duration,
    pub active_connections: u32,
    pub timestamp: u64,
}

/// Production deployment manager
pub struct DeploymentManager {
    config: DeploymentConfig,
    status: DeploymentStatus,
    metrics: DeploymentMetrics,
    started_at: SystemTime,
}

impl DeploymentManager {
    /// Create new deployment manager
    pub fn new(config: DeploymentConfig) -> Self {
        let now = SystemTime::now();

        Self {
            config,
            status: DeploymentStatus::Initializing,
            metrics: DeploymentMetrics {
                status: DeploymentStatus::Initializing,
                uptime: Duration::from_secs(0),
                cpu_usage: 0.0,
                memory_usage: 0.0,
                request_count: 0,
                error_rate: 0.0,
                response_time: Duration::from_millis(0),
                active_connections: 0,
                timestamp: now.duration_since(UNIX_EPOCH).unwrap().as_secs(),
            },
            started_at: now,
        }
    }

    /// Initialize deployment with comprehensive setup
    pub async fn initialize(&mut self) -> Result<(), DeploymentError> {
        self.status = DeploymentStatus::Configuring;

        // Initialize configuration
        self.validate_config().await?;

        // Setup health checks
        self.status = DeploymentStatus::HealthChecking;
        self.setup_health_checks().await?;

        // Initialize monitoring
        self.setup_monitoring().await?;

        // Setup performance optimization
        self.optimize_performance().await?;

        self.status = DeploymentStatus::Running;
        Ok(())
    }

    /// Validate deployment configuration
    async fn validate_config(&self) -> Result<(), DeploymentError> {
        // Validate scaling configuration
        if self.config.scaling.min_instances > self.config.scaling.max_instances {
            return Err(DeploymentError::Configuration(
                "Minimum instances cannot exceed maximum instances".to_string(),
            ));
        }

        // Validate thresholds
        if self.config.scaling.cpu_threshold < 0.0 || self.config.scaling.cpu_threshold > 1.0 {
            return Err(DeploymentError::Configuration(
                "CPU threshold must be between 0.0 and 1.0".to_string(),
            ));
        }

        if self.config.scaling.memory_threshold < 0.0 || self.config.scaling.memory_threshold > 1.0
        {
            return Err(DeploymentError::Configuration(
                "Memory threshold must be between 0.0 and 1.0".to_string(),
            ));
        }

        // Validate health check configuration
        if self.config.health_checks.timeout > self.config.health_checks.interval {
            return Err(DeploymentError::Configuration(
                "Health check timeout cannot exceed interval".to_string(),
            ));
        }

        // Validate monitoring configuration
        if self.config.monitoring.sample_rate < 0.0 || self.config.monitoring.sample_rate > 1.0 {
            return Err(DeploymentError::Configuration(
                "Monitoring sample rate must be between 0.0 and 1.0".to_string(),
            ));
        }

        Ok(())
    }

    /// Setup health check system
    async fn setup_health_checks(&self) -> Result<(), DeploymentError> {
        if !self.config.health_checks.enabled {
            return Ok(());
        }

        // Initialize health check endpoints
        for endpoint in &self.config.health_checks.endpoints {
            // Validate endpoint accessibility
            if endpoint.is_empty() {
                return Err(DeploymentError::HealthCheck(
                    "Health check endpoint cannot be empty".to_string(),
                ));
            }
        }

        Ok(())
    }

    /// Setup monitoring integration
    async fn setup_monitoring(&self) -> Result<(), DeploymentError> {
        if !self.config.monitoring.enabled {
            return Ok(());
        }

        // Validate monitoring endpoints
        if self.config.monitoring.metrics_endpoint.is_empty() {
            return Err(DeploymentError::Monitoring(
                "Metrics endpoint cannot be empty".to_string(),
            ));
        }

        if self.config.monitoring.logs_endpoint.is_empty() {
            return Err(DeploymentError::Monitoring(
                "Logs endpoint cannot be empty".to_string(),
            ));
        }

        Ok(())
    }

    /// Optimize performance based on configuration
    async fn optimize_performance(&self) -> Result<(), DeploymentError> {
        match self.config.performance.optimization_level {
            OptimizationLevel::Development => {
                // Minimal optimization for development
            }
            OptimizationLevel::Testing => {
                // Balanced optimization for testing
            }
            OptimizationLevel::Production => {
                // High optimization for production
                self.optimize_for_production().await?;
            }
            OptimizationLevel::Maximum => {
                // Maximum optimization
                self.optimize_for_production().await?;
                self.apply_maximum_optimizations().await?;
            }
        }

        Ok(())
    }

    /// Apply production-level optimizations
    async fn optimize_for_production(&self) -> Result<(), DeploymentError> {
        // Configure connection pooling
        if self.config.performance.connection_pool.min_connections
            > self.config.performance.connection_pool.max_connections
        {
            return Err(DeploymentError::Performance(
                "Minimum connections cannot exceed maximum connections".to_string(),
            ));
        }

        // Setup caching if enabled
        if self.config.performance.cache_config.enabled {
            // Validate cache configuration
            if self.config.performance.cache_config.max_size == 0 {
                return Err(DeploymentError::Performance(
                    "Cache max size must be greater than 0".to_string(),
                ));
            }
        }

        Ok(())
    }

    /// Apply maximum performance optimizations
    async fn apply_maximum_optimizations(&self) -> Result<(), DeploymentError> {
        // Apply aggressive optimizations for maximum performance
        Ok(())
    }

    /// Start deployment process
    pub async fn deploy(&mut self) -> Result<(), DeploymentError> {
        self.status = DeploymentStatus::Deploying;

        // Execute deployment strategy
        match self.config.automation.deployment_strategy {
            DeploymentStrategy::BlueGreen => {
                self.deploy_blue_green().await?;
            }
            DeploymentStrategy::RollingUpdate => {
                self.deploy_rolling_update().await?;
            }
            DeploymentStrategy::Canary => {
                self.deploy_canary().await?;
            }
            DeploymentStrategy::Recreate => {
                self.deploy_recreate().await?;
            }
            DeploymentStrategy::Custom(ref strategy) => {
                self.deploy_custom(strategy).await?;
            }
        }

        self.status = DeploymentStatus::Running;
        Ok(())
    }

    /// Blue-green deployment strategy
    async fn deploy_blue_green(&self) -> Result<(), DeploymentError> {
        // Implement blue-green deployment
        Ok(())
    }

    /// Rolling update deployment strategy
    async fn deploy_rolling_update(&self) -> Result<(), DeploymentError> {
        // Implement rolling update deployment
        Ok(())
    }

    /// Canary deployment strategy
    async fn deploy_canary(&self) -> Result<(), DeploymentError> {
        // Implement canary deployment
        Ok(())
    }

    /// Recreate deployment strategy
    async fn deploy_recreate(&self) -> Result<(), DeploymentError> {
        // Implement recreate deployment
        Ok(())
    }

    /// Custom deployment strategy
    async fn deploy_custom(&self, _strategy: &str) -> Result<(), DeploymentError> {
        // Implement custom deployment strategy
        Ok(())
    }

    /// Get current deployment status
    pub fn get_status(&self) -> &DeploymentStatus {
        &self.status
    }

    /// Get deployment metrics
    pub fn get_metrics(&mut self) -> &DeploymentMetrics {
        // Update metrics
        self.update_metrics();
        &self.metrics
    }

    /// Update deployment metrics
    fn update_metrics(&mut self) {
        let now = SystemTime::now();
        self.metrics.uptime = now.duration_since(self.started_at).unwrap_or_default();
        self.metrics.timestamp = now.duration_since(UNIX_EPOCH).unwrap().as_secs();
        self.metrics.status = self.status.clone();
    }

    /// Scale deployment based on current metrics
    pub async fn scale(&mut self) -> Result<(), DeploymentError> {
        if !self.config.scaling.auto_scale {
            return Ok(());
        }

        self.status = DeploymentStatus::Scaling;

        // Check if scaling is needed based on thresholds
        if self.metrics.cpu_usage > self.config.scaling.cpu_threshold
            || self.metrics.memory_usage > self.config.scaling.memory_threshold
        {
            // Scale up
            self.scale_up().await?;
        } else if self.metrics.cpu_usage < self.config.scaling.cpu_threshold * 0.5
            && self.metrics.memory_usage < self.config.scaling.memory_threshold * 0.5
        {
            // Scale down
            self.scale_down().await?;
        }

        self.status = DeploymentStatus::Running;
        Ok(())
    }

    /// Scale up deployment
    async fn scale_up(&self) -> Result<(), DeploymentError> {
        // Implement scale up logic
        Ok(())
    }

    /// Scale down deployment
    async fn scale_down(&self) -> Result<(), DeploymentError> {
        // Implement scale down logic
        Ok(())
    }

    /// Perform health check
    pub async fn health_check(&mut self) -> Result<bool, DeploymentError> {
        if !self.config.health_checks.enabled {
            return Ok(true);
        }

        // Perform health checks on all endpoints
        for endpoint in &self.config.health_checks.endpoints {
            if !self.check_endpoint_health(endpoint).await? {
                return Ok(false);
            }
        }

        Ok(true)
    }

    /// Check health of specific endpoint
    async fn check_endpoint_health(&self, _endpoint: &str) -> Result<bool, DeploymentError> {
        // Implement endpoint health check
        Ok(true)
    }

    /// Stop deployment
    pub async fn stop(&mut self) -> Result<(), DeploymentError> {
        self.status = DeploymentStatus::Stopped;
        Ok(())
    }

    /// Rollback deployment if enabled
    pub async fn rollback(&mut self) -> Result<(), DeploymentError> {
        if !self.config.automation.rollback_enabled {
            return Err(DeploymentError::Automation(
                "Rollback is not enabled".to_string(),
            ));
        }

        // Implement rollback logic
        self.status = DeploymentStatus::Running;
        Ok(())
    }
}

impl Default for DeploymentConfig {
    fn default() -> Self {
        let now = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_secs();

        Self {
            environment: DeploymentEnvironment::Development,
            scaling: ScalingConfig {
                min_instances: 1,
                max_instances: 10,
                cpu_threshold: 0.75,
                memory_threshold: 0.75,
                auto_scale: true,
                scale_up_cooldown: Duration::from_secs(300),
                scale_down_cooldown: Duration::from_secs(600),
            },
            monitoring: MonitoringConfig {
                enabled: true,
                metrics_endpoint: "http://localhost:9090/metrics".to_string(),
                logs_endpoint: "http://localhost:3100".to_string(),
                alert_endpoints: vec!["http://localhost:9093".to_string()],
                retention_period: Duration::from_secs(30 * 24 * 3600), // 30 days
                sample_rate: 1.0,
            },
            health_checks: HealthCheckConfig {
                enabled: true,
                interval: Duration::from_secs(30),
                timeout: Duration::from_secs(10),
                healthy_threshold: 3,
                unhealthy_threshold: 3,
                endpoints: vec!["/health".to_string(), "/ready".to_string()],
            },
            automation: AutomationConfig {
                enabled: true,
                deployment_strategy: DeploymentStrategy::RollingUpdate,
                rollback_enabled: true,
                rollback_threshold: 0.95,
                ci_cd_integration: true,
                automated_tests: true,
            },
            performance: PerformanceConfig {
                optimization_level: OptimizationLevel::Production,
                cache_config: CacheConfig {
                    enabled: true,
                    max_size: 10000,
                    ttl: Duration::from_secs(3600),
                    eviction_policy: EvictionPolicy::LRU,
                },
                connection_pool: ConnectionPoolConfig {
                    min_connections: 5,
                    max_connections: 100,
                    idle_timeout: Duration::from_secs(600),
                    max_lifetime: Duration::from_secs(3600),
                },
                memory_limits: MemoryLimits {
                    heap_size: Some(2 * 1024 * 1024 * 1024), // 2GB
                    stack_size: Some(8 * 1024 * 1024),       // 8MB
                    gc_threshold: Some(1024 * 1024 * 1024),  // 1GB
                },
                cpu_limits: CpuLimits {
                    max_cores: None,
                    cpu_quota: Some(0.8),
                    thread_pool_size: Some(100),
                },
            },
            created_at: now,
            updated_at: now,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn test_deployment_manager_creation() {
        let config = DeploymentConfig::default();
        let manager = DeploymentManager::new(config);

        assert!(matches!(manager.status, DeploymentStatus::Initializing));
    }

    #[tokio::test]
    async fn test_config_validation() {
        let mut config = DeploymentConfig::default();
        config.scaling.min_instances = 10;
        config.scaling.max_instances = 5;

        let mut manager = DeploymentManager::new(config);
        let result = manager.initialize().await;

        assert!(result.is_err());
        assert!(matches!(
            result.unwrap_err(),
            DeploymentError::Configuration(_)
        ));
    }

    #[tokio::test]
    async fn test_deployment_initialization() {
        let config = DeploymentConfig::default();
        let mut manager = DeploymentManager::new(config);

        let result = manager.initialize().await;
        assert!(result.is_ok());
        assert!(matches!(manager.status, DeploymentStatus::Running));
    }

    #[tokio::test]
    async fn test_health_check() {
        let config = DeploymentConfig::default();
        let mut manager = DeploymentManager::new(config);
        let _ = manager.initialize().await;

        let result = manager.health_check().await;
        assert!(result.is_ok());
        assert!(result.unwrap());
    }

    #[tokio::test]
    async fn test_deployment_metrics() {
        let config = DeploymentConfig::default();
        let mut manager = DeploymentManager::new(config);
        let _ = manager.initialize().await;

        let metrics = manager.get_metrics();
        assert!(matches!(metrics.status, DeploymentStatus::Running));
        assert!(metrics.timestamp > 0);
    }
}