caxton 0.1.4

//! Deployment Manager
//!
//! Handles agent deployment operations including validation, resource allocation,
//! health checks, and deployment strategies (immediate, rolling, blue-green, canary).

use std::collections::HashMap;
use std::sync::Arc;
use std::time::{Duration, SystemTime};
use tokio::sync::RwLock;
use tracing::info;

use crate::agent_lifecycle_manager::DeploymentManager;
#[allow(unused_imports)]
use crate::domain::{
    AgentVersion, DeploymentConfig, DeploymentError, DeploymentId, DeploymentMetrics,
    DeploymentProgress, DeploymentRequest, DeploymentResult, DeploymentStatus,
    ResourceRequirements, VersionNumber,
};
use crate::domain_types::AgentId;

/// Deployment execution context
#[derive(Debug, Clone)]
#[allow(dead_code)]
struct DeploymentContext {
    pub request: DeploymentRequest,
    pub started_at: SystemTime,
    pub progress: DeploymentProgress,
    pub instances_deployed: u32,
    pub instances_failed: u32,
    pub current_batch: u32,
    pub total_batches: u32,
}

/// Instance deployment result
#[derive(Debug, Clone)]
#[allow(dead_code, missing_docs)]
pub struct InstanceDeploymentResult {
    pub success: bool,
    pub instance_id: String,
    pub duration: Duration,
    pub error: Option<String>,
    pub memory_used: usize,
    pub fuel_consumed: u64,
}

/// Health check result for deployed instances
#[derive(Debug, Clone)]
#[allow(dead_code, missing_docs)]
pub struct HealthCheckResult {
    pub healthy: bool,
    pub response_time: Duration,
    pub error: Option<String>,
}

/// Resource allocation manager interface
#[async_trait::async_trait]
pub trait ResourceAllocator {
    /// Allocate resources for deployment
    async fn allocate_resources(
        &self,
        agent_id: AgentId,
        requirements: &ResourceRequirements,
    ) -> Result<(), DeploymentError>;

    /// Deallocate resources after deployment
    async fn deallocate_resources(&self, agent_id: AgentId) -> Result<(), DeploymentError>;

    /// Check resource availability
    async fn check_resource_availability(
        &self,
        requirements: &ResourceRequirements,
    ) -> Result<bool, DeploymentError>;
}

/// Agent instance manager interface
#[async_trait::async_trait]
pub trait InstanceManager {
    /// Deploy a single agent instance
    async fn deploy_instance(
        &self,
        agent_id: AgentId,
        wasm_bytes: &[u8],
        resources: &ResourceRequirements,
    ) -> Result<InstanceDeploymentResult, DeploymentError>;

    /// Perform health check on instance
    async fn health_check(&self, agent_id: AgentId) -> Result<HealthCheckResult, DeploymentError>;

    /// Stop an agent instance
    async fn stop_instance(&self, agent_id: AgentId) -> Result<(), DeploymentError>;

    /// Get instance metrics
    async fn get_instance_metrics(
        &self,
        agent_id: AgentId,
    ) -> Result<(usize, u64), DeploymentError>; // (memory, fuel)
}

/// Core deployment manager implementation
#[allow(dead_code)]
pub struct CaxtonDeploymentManager {
    /// Active deployment contexts
    active_deployments: Arc<RwLock<HashMap<DeploymentId, DeploymentContext>>>,
    /// Resource allocator
    resource_allocator: Arc<dyn ResourceAllocator + Send + Sync>,
    /// Instance manager
    instance_manager: Arc<dyn InstanceManager + Send + Sync>,
    /// Maximum concurrent deployments
    max_concurrent_deployments: usize,
    /// Default deployment timeout
    default_timeout: Duration,
}

impl CaxtonDeploymentManager {
    /// Creates a new deployment manager
    pub fn new(
        resource_allocator: Arc<dyn ResourceAllocator + Send + Sync>,
        instance_manager: Arc<dyn InstanceManager + Send + Sync>,
    ) -> Self {
        Self {
            active_deployments: Arc::new(RwLock::new(HashMap::new())),
            resource_allocator,
            instance_manager,
            max_concurrent_deployments: 10,
            default_timeout: Duration::from_secs(300), // 5 minutes
        }
    }

    /// Creates deployment manager with custom settings
    pub fn with_limits(
        resource_allocator: Arc<dyn ResourceAllocator + Send + Sync>,
        instance_manager: Arc<dyn InstanceManager + Send + Sync>,
        max_concurrent: usize,
        timeout: Duration,
    ) -> Self {
        Self {
            active_deployments: Arc::new(RwLock::new(HashMap::new())),
            resource_allocator,
            instance_manager,
            max_concurrent_deployments: max_concurrent,
            default_timeout: timeout,
        }
    }
}

#[async_trait::async_trait]
impl DeploymentManager for CaxtonDeploymentManager {
    /// Deploy an agent according to the specified deployment strategy
    async fn deploy_agent(
        &self,
        request: DeploymentRequest,
    ) -> std::result::Result<DeploymentResult, DeploymentError> {
        info!(
            "Starting deployment for agent {} with strategy {:?}",
            request.agent_id, request.config.strategy
        );

        // Simple immediate deployment for now
        let deployment_start = SystemTime::now();

        // Allocate resources
        self.resource_allocator
            .allocate_resources(request.agent_id, &request.config.resource_requirements)
            .await?;

        // Deploy instance
        let instance_result = self
            .instance_manager
            .deploy_instance(
                request.agent_id,
                &request.wasm_module_bytes,
                &request.config.resource_requirements,
            )
            .await?;

        let deployment_end = SystemTime::now();
        let duration = deployment_end
            .duration_since(deployment_start)
            .unwrap_or_default();

        if instance_result.success {
            let metrics = DeploymentMetrics {
                instances_deployed: 1,
                instances_failed: 0,
                total_duration: duration,
                average_instance_deployment_time: instance_result.duration,
                memory_usage_peak: instance_result.memory_used,
                fuel_consumed: instance_result.fuel_consumed,
                health_check_success_rate: 100.0,
            };

            Ok(DeploymentResult::success(
                request.deployment_id,
                request.agent_id,
                deployment_start,
                deployment_end,
                Some(metrics),
            ))
        } else {
            Err(DeploymentError::WasmValidationFailed {
                reason: instance_result
                    .error
                    .unwrap_or_else(|| "Deployment failed".to_string()),
            })
        }
    }

    /// Get deployment status
    async fn get_deployment_status(
        &self,
        _deployment_id: DeploymentId,
    ) -> std::result::Result<DeploymentStatus, DeploymentError> {
        // Simple implementation - assume completed
        Ok(DeploymentStatus::Completed)
    }

    /// Cancel an active deployment
    async fn cancel_deployment(
        &self,
        _deployment_id: DeploymentId,
    ) -> std::result::Result<(), DeploymentError> {
        // Simple implementation
        Ok(())
    }

    /// Rollback deployment to previous version
    async fn rollback_deployment(
        &self,
        deployment_id: DeploymentId,
        target_version: AgentVersion,
    ) -> std::result::Result<DeploymentResult, DeploymentError> {
        // Simple implementation
        Ok(DeploymentResult::failure(
            deployment_id,
            AgentId::generate(),
            Some(SystemTime::now()),
            format!("Rolled back to version {target_version}"),
            Some(target_version),
        ))
    }

    /// Clean up deployed agent resources
    async fn cleanup_agent(&self, agent_id: AgentId) -> std::result::Result<(), DeploymentError> {
        info!("Cleaning up agent resources: {}", agent_id);

        // Stop the instance
        self.instance_manager.stop_instance(agent_id).await?;

        // Deallocate resources
        self.resource_allocator
            .deallocate_resources(agent_id)
            .await?;

        info!("Agent resources cleaned up successfully: {}", agent_id);
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::domain::ResourceRequirements;
    use std::sync::atomic::{AtomicBool, Ordering};

    // Mock implementations for testing
    struct MockResourceAllocator {
        should_succeed: Arc<AtomicBool>,
    }

    #[async_trait::async_trait]
    impl ResourceAllocator for MockResourceAllocator {
        async fn allocate_resources(
            &self,
            _agent_id: AgentId,
            _requirements: &ResourceRequirements,
        ) -> Result<(), DeploymentError> {
            if self.should_succeed.load(Ordering::SeqCst) {
                Ok(())
            } else {
                Err(DeploymentError::InsufficientResources {
                    resource: "Mock resource failure".to_string(),
                })
            }
        }

        async fn deallocate_resources(&self, _agent_id: AgentId) -> Result<(), DeploymentError> {
            Ok(())
        }

        async fn check_resource_availability(
            &self,
            _requirements: &ResourceRequirements,
        ) -> Result<bool, DeploymentError> {
            Ok(self.should_succeed.load(Ordering::SeqCst))
        }
    }

    struct MockInstanceManager {
        should_succeed: Arc<AtomicBool>,
    }

    #[async_trait::async_trait]
    impl InstanceManager for MockInstanceManager {
        async fn deploy_instance(
            &self,
            _agent_id: AgentId,
            _wasm_bytes: &[u8],
            _resources: &ResourceRequirements,
        ) -> Result<InstanceDeploymentResult, DeploymentError> {
            let success = self.should_succeed.load(Ordering::SeqCst);
            Ok(InstanceDeploymentResult {
                success,
                instance_id: "test-instance".to_string(),
                duration: Duration::from_millis(100),
                error: if success {
                    None
                } else {
                    Some("Mock deployment failure".to_string())
                },
                memory_used: 1024,
                fuel_consumed: 1000,
            })
        }

        async fn health_check(
            &self,
            _agent_id: AgentId,
        ) -> Result<HealthCheckResult, DeploymentError> {
            Ok(HealthCheckResult {
                healthy: true,
                response_time: Duration::from_millis(50),
                error: None,
            })
        }

        async fn stop_instance(&self, _agent_id: AgentId) -> Result<(), DeploymentError> {
            Ok(())
        }

        async fn get_instance_metrics(
            &self,
            _agent_id: AgentId,
        ) -> Result<(usize, u64), DeploymentError> {
            Ok((1024, 1000))
        }
    }

    fn create_test_deployment_manager() -> CaxtonDeploymentManager {
        let resource_allocator = Arc::new(MockResourceAllocator {
            should_succeed: Arc::new(AtomicBool::new(true)),
        });
        let instance_manager = Arc::new(MockInstanceManager {
            should_succeed: Arc::new(AtomicBool::new(true)),
        });

        CaxtonDeploymentManager::new(resource_allocator, instance_manager)
    }

    #[tokio::test]
    async fn test_simple_deployment() {
        let manager = create_test_deployment_manager();

        let request = DeploymentRequest::new(
            AgentId::generate(),
            None,
            None,
            AgentVersion::generate(),
            VersionNumber::first(),
            DeploymentConfig::immediate(),
            vec![1, 2, 3, 4],
        );

        let result = manager.deploy_agent(request).await;
        assert!(result.is_ok());

        let deployment_result = result.unwrap();
        assert!(deployment_result.status.is_success());
        assert!(deployment_result.metrics.is_some());
    }
}