mitoxide 0.1.0

//! Comprehensive integration tests for jump host and routing functionality
//! 
//! These tests verify multi-hop SSH connections, connection routing, multiplexing,
//! failure recovery, and load balancing across different network topologies.

use super::*;
use anyhow::{Context, Result};
use std::collections::HashMap;
use std::sync::Arc;
use std::time::{Duration, Instant};
use tokio::time::{timeout, sleep};
// Note: These imports would be used in actual implementation
// For now, we'll simulate the behavior with mock implementations
// use mitoxide::{Session, Context as MitoxideContext, MitoxideError};
// use mitoxide_ssh::{ConnectionPool, PoolConfig, SshConfig as MitoxideSshConfig};
use crate::integration::{
    DockerTestEnv, SshHelper, SshConfig, TestAssertions, PerformanceUtils, EnvUtils
};

/// Test jump host and routing functionality
pub struct RoutingTests {
    docker_env: DockerTestEnv,
    ssh_helper: SshHelper,
}

impl RoutingTests {
    /// Create new routing tests instance
    pub fn new() -> Self {
        Self {
            docker_env: DockerTestEnv::new(),
            ssh_helper: SshHelper::new(),
        }
    }
    
    /// Setup test environment
    pub async fn setup(&self) -> Result<()> {
        println!("Setting up routing test environment...");
        
        // Check prerequisites
        EnvUtils::setup_test_environment()?;
        
        // Start Docker containers
        self.docker_env.start().await
            .context("Failed to start Docker test environment")?;
        
        // Wait for SSH services to be ready
        sleep(Duration::from_secs(5)).await;
        
        // Test basic connectivity
        let test_results = self.ssh_helper.test_all_containers().await?;
        if !test_results.all_successful() {
            anyhow::bail!("Not all containers are accessible: {:?}", test_results.failed_tests());
        }
        
        println!("✅ Routing test environment ready");
        Ok(())
    }
    
    /// Cleanup test environment
    pub async fn cleanup(&self) -> Result<()> {
        println!("Cleaning up routing test environment...");
        self.docker_env.cleanup().await
            .context("Failed to cleanup Docker test environment")?;
        Ok(())
    }
    
    /// Test multi-hop SSH connections through bastion
    pub async fn test_multi_hop_connections(&self) -> Result<()> {
        println!("🧪 Testing multi-hop SSH connections through bastion...");
        
        // Test direct connection to bastion
        let bastion_config = self.ssh_helper.config_for_container("bastion", 2224);
        let bastion_connected = self.ssh_helper.test_connectivity(&bastion_config).await?;
        TestAssertions::assert_ssh_success(
            &crate::integration::SshCommandOutput {
                exit_code: if bastion_connected { 0 } else { 1 },
                stdout: "".to_string(),
                stderr: "".to_string(),
            },
            "Bastion connection"
        )?;
        
        // Test connection to backend target through bastion
        let backend_config = self.ssh_helper.config_for_jump_host("mitoxide_backend_target", 2224);
        let backend_connected = self.ssh_helper.test_connectivity(&backend_config).await?;
        TestAssertions::assert_ssh_success(
            &crate::integration::SshCommandOutput {
                exit_code: if backend_connected { 0 } else { 1 },
                stdout: "".to_string(),
                stderr: "".to_string(),
            },
            "Backend target via jump host"
        )?;
        
        // Test command execution through jump host
        let output = self.ssh_helper.execute_command(&backend_config, &["uname", "-a"]).await?;
        TestAssertions::assert_ssh_success(&output, "Command execution through jump host")?;
        TestAssertions::assert_output_contains(&output.stdout, "Linux", "uname output")?;
        
        // Test file operations through jump host
        let test_content = "Hello from jump host test!";
        let remote_path = "/tmp/jump_host_test.txt";
        
        // Write file through jump host
        let write_output = self.ssh_helper.execute_command(
            &backend_config,
            &["sh", "-c", &format!("echo '{}' > {}", test_content, remote_path)]
        ).await?;
        TestAssertions::assert_ssh_success(&write_output, "File write through jump host")?;
        
        // Read file through jump host
        let read_output = self.ssh_helper.execute_command(
            &backend_config,
            &["cat", remote_path]
        ).await?;
        TestAssertions::assert_ssh_success(&read_output, "File read through jump host")?;
        TestAssertions::assert_output_contains(&read_output.stdout, test_content, "File content")?;
        
        println!("✅ Multi-hop SSH connections test passed");
        Ok(())
    }
    
    /// Test connection routing and multiplexing
    pub async fn test_connection_routing_multiplexing(&self) -> Result<()> {
        println!("🧪 Testing connection routing and multiplexing...");
        
        // Test concurrent SSH operations to multiple targets
        let targets = vec![
            ("ubuntu_min", 2223),
            ("alpine_ro", 2222),
        ];
        
        let mut handles = Vec::new();
        
        for (container, port) in targets {
            let ssh_helper = self.ssh_helper.clone();
            let handle = tokio::spawn(async move {
                let config = ssh_helper.config_for_container(container, port);
                
                // Execute multiple concurrent commands
                let mut command_results = Vec::new();
                
                for i in 0..5 {
                    let output = ssh_helper.execute_command(
                        &config,
                        &["echo", &format!("test_{}", i)]
                    ).await?;
                    
                    if !output.success() {
                        anyhow::bail!("Command {} failed on {}: {}", i, container, output.stderr);
                    }
                    
                    command_results.push((i, output.stdout.trim().to_string()));
                }
                
                Ok::<_, anyhow::Error>((container, command_results))
            });
            
            handles.push(handle);
        }
        
        // Wait for all operations to complete
        let mut all_results = Vec::new();
        for handle in handles {
            let (container, results) = handle.await??;
            all_results.push((container, results));
        }
        
        // Verify all operations completed successfully
        for (container, results) in all_results {
            assert_eq!(results.len(), 5, "Expected 5 command results for {}", container);
            for (i, output) in results.iter() {
                assert_eq!(output, &format!("test_{}", i), 
                          "Unexpected output for command {} on {}: {}", i, container, output);
            }
            println!("✅ Container {} completed all {} commands", container, results.len());
        }
        
        println!("✅ Connection routing and multiplexing test passed");
        Ok(())
    }
    
    /// Test connection failure and recovery
    pub async fn test_connection_failure_recovery(&self) -> Result<()> {
        println!("🧪 Testing connection failure and recovery...");
        
        let config = self.ssh_helper.config_for_container("ubuntu_min", 2223);
        
        // Test normal operation
        let output = self.ssh_helper.execute_command(&config, &["echo", "before_failure"]).await?;
        TestAssertions::assert_ssh_success(&output, "Normal operation before failure")?;
        TestAssertions::assert_output_contains(&output.stdout, "before_failure", "Pre-failure output")?;
        
        // Simulate network failure by stopping SSH service
        println!("Simulating network failure...");
        let stop_output = self.docker_env.exec_command("ubuntu_min", &["pkill", "-f", "sshd"]).await;
        // Note: This might fail if sshd is not running as expected, which is okay for the test
        
        // Wait a moment for the failure to propagate
        sleep(Duration::from_secs(2)).await;
        
        // Try to execute command - should fail
        let failure_result = self.ssh_helper.test_connectivity(&config).await?;
        assert!(!failure_result, "Expected connection to fail during network failure");
        
        // Restart the container's SSH service
        println!("Recovering from network failure...");
        sleep(Duration::from_secs(3)).await;
        
        // The container should automatically restart SSH, but let's ensure it's running
        let restart_output = self.docker_env.exec_command("ubuntu_min", &["service", "ssh", "start"]).await;
        // This might fail if SSH is already running, which is fine
        
        // Wait for recovery
        sleep(Duration::from_secs(5)).await;
        
        // Test that operations work again
        let recovery_result = self.ssh_helper.test_connectivity(&config).await?;
        if !recovery_result {
            // If SSH didn't restart automatically, try to restart it
            let _ = self.docker_env.exec_command("ubuntu_min", &["service", "ssh", "restart"]).await;
            sleep(Duration::from_secs(3)).await;
        }
        
        let recovery_output = self.ssh_helper.execute_command(&config, &["echo", "after_recovery"]).await?;
        TestAssertions::assert_ssh_success(&recovery_output, "Operation after recovery")?;
        TestAssertions::assert_output_contains(&recovery_output.stdout, "after_recovery", "Post-recovery output")?;
        
        println!("✅ Connection failure and recovery test passed");
        Ok(())
    }
    
    /// Test load balancing and connection pooling
    pub async fn test_load_balancing_connection_pooling(&self) -> Result<()> {
        println!("🧪 Testing load balancing and connection pooling...");
        
        // Simulate connection pooling by testing concurrent SSH connections
        let config = self.ssh_helper.config_for_container("ubuntu_min", 2223);
        
        // Test concurrent connection requests
        let num_concurrent = 10;
        let mut handles = Vec::new();
        
        for i in 0..num_concurrent {
            let ssh_helper = self.ssh_helper.clone();
            let config_clone = config.clone();
            let handle = tokio::spawn(async move {
                let start_time = Instant::now();
                
                // Test connection establishment time
                let connectivity_result = ssh_helper.test_connectivity(&config_clone).await?;
                let connection_time = start_time.elapsed();
                
                if !connectivity_result {
                    anyhow::bail!("Connection {} failed", i);
                }
                
                // Execute a command to simulate work
                let output = ssh_helper.execute_command(
                    &config_clone,
                    &["echo", &format!("pool_test_{}", i)]
                ).await?;
                
                if !output.success() {
                    anyhow::bail!("Command execution failed for connection {}: {}", i, output.stderr);
                }
                
                Ok::<_, anyhow::Error>((i, connection_time, output.stdout.trim().to_string()))
            });
            
            handles.push(handle);
        }
        
        // Wait for all connections to complete
        let mut results = Vec::new();
        for handle in handles {
            let (i, time, output) = handle.await??;
            println!("Connection {}: established in {:?}, output: {}", i, time, output);
            results.push((i, time, output));
        }
        
        // Verify all connections succeeded
        assert_eq!(results.len(), num_concurrent, "Not all connections completed");
        
        // Verify connection efficiency
        let avg_time = results.iter()
            .map(|(_, time, _)| time.as_millis())
            .sum::<u128>() as f64 / results.len() as f64;
        
        println!("Average connection time: {:.2}ms", avg_time);
        
        // Assert reasonable performance (connections should be under 5 seconds each)
        for (i, time, _) in &results {
            TestAssertions::assert_performance_threshold(
                *time,
                Duration::from_secs(5),
                &format!("Connection {} establishment", i)
            )?;
        }
        
        // Verify all outputs are correct
        for (i, _, output) in &results {
            assert_eq!(output, &format!("pool_test_{}", i), 
                      "Unexpected output for connection {}: {}", i, output);
        }
        
        println!("✅ Load balancing and connection pooling test passed");
        Ok(())
    }
    
    /// Test routing performance under load
    pub async fn test_routing_performance(&self) -> Result<()> {
        println!("🧪 Testing routing performance under load...");
        
        let config = self.ssh_helper.config_for_container("ubuntu_min", 2223);
        
        // Measure latency for single operations
        let num_operations = 20; // Reduced for faster testing
        let mut latencies = Vec::new();
        
        for i in 0..num_operations {
            let (output_result, latency) = PerformanceUtils::measure_async(
                self.ssh_helper.execute_command(&config, &["echo", &format!("perf_test_{}", i)])
            ).await;
            
            let output = output_result?;
            TestAssertions::assert_ssh_success(&output, &format!("Performance test {}", i))?;
            latencies.push(latency);
        }
        
        // Calculate performance statistics
        latencies.sort();
        let p50 = latencies[latencies.len() / 2];
        let p95 = latencies[latencies.len() * 95 / 100];
        let p99 = latencies[latencies.len() * 99 / 100];
        
        println!("Performance results:");
        println!("  P50 latency: {}", PerformanceUtils::format_duration(p50));
        println!("  P95 latency: {}", PerformanceUtils::format_duration(p95));
        println!("  P99 latency: {}", PerformanceUtils::format_duration(p99));
        
        // Assert performance thresholds (more lenient for SSH overhead)
        TestAssertions::assert_performance_threshold(
            p50,
            Duration::from_secs(2),
            "P50 latency"
        )?;
        
        TestAssertions::assert_performance_threshold(
            p95,
            Duration::from_secs(5),
            "P95 latency"
        )?;
        
        // Test concurrent throughput
        let concurrent_ops = 10; // Reduced for faster testing
        let mut handles = Vec::new();
        
        let start_time = Instant::now();
        
        for i in 0..concurrent_ops {
            let ssh_helper = self.ssh_helper.clone();
            let config_clone = config.clone();
            let handle = tokio::spawn(async move {
                ssh_helper.execute_command(&config_clone, &["echo", &format!("concurrent_{}", i)]).await
            });
            handles.push(handle);
        }
        
        // Wait for all operations to complete
        let mut successful_ops = 0;
        for handle in handles {
            if let Ok(Ok(output)) = handle.await {
                if output.success() {
                    successful_ops += 1;
                }
            }
        }
        
        let total_time = start_time.elapsed();
        let ops_per_second = successful_ops as f64 / total_time.as_secs_f64();
        
        println!("Throughput: {:.2} ops/second ({}/{} successful)", 
                ops_per_second, successful_ops, concurrent_ops);
        
        // Assert minimum throughput (more lenient for SSH)
        if ops_per_second < 2.0 {
            anyhow::bail!("Throughput too low: {:.2} ops/second (minimum: 2.0)", ops_per_second);
        }
        
        // Assert that most operations succeeded
        if successful_ops < concurrent_ops * 8 / 10 {
            anyhow::bail!("Too many operations failed: {}/{}", 
                         concurrent_ops - successful_ops, concurrent_ops);
        }
        
        println!("✅ Routing performance test passed");
        Ok(())
    }
    
    /// Run all routing tests
    pub async fn run_all_tests(&self) -> Result<()> {
        println!("🚀 Running comprehensive routing tests...");
        
        self.setup().await?;
        
        let test_results = vec![
            ("Multi-hop connections", self.test_multi_hop_connections().await),
            ("Connection routing and multiplexing", self.test_connection_routing_multiplexing().await),
            ("Connection failure and recovery", self.test_connection_failure_recovery().await),
            ("Load balancing and connection pooling", self.test_load_balancing_connection_pooling().await),
            ("Routing performance", self.test_routing_performance().await),
        ];
        
        let mut failed_tests = Vec::new();
        let mut passed_tests = Vec::new();
        
        for (test_name, result) in test_results {
            match result {
                Ok(()) => {
                    passed_tests.push(test_name);
                    println!("✅ {} - PASSED", test_name);
                }
                Err(e) => {
                    println!("❌ {} - FAILED: {}", test_name, e);
                    failed_tests.push((test_name, e));
                }
            }
        }
        
        self.cleanup().await?;
        
        println!("\n📊 Test Results Summary:");
        println!("  Passed: {}", passed_tests.len());
        println!("  Failed: {}", failed_tests.len());
        
        if !failed_tests.is_empty() {
            println!("\n❌ Failed tests:");
            for (test_name, error) in &failed_tests {
                println!("  - {}: {}", test_name, error);
            }
            anyhow::bail!("Some routing tests failed");
        }
        
        println!("\n🎉 All routing tests passed!");
        Ok(())
    }
}