qudag-protocol 0.5.0

use qudag_protocol::{Coordinator, ProtocolConfig, ProtocolState};
use qudag_crypto::{KeyPair, PublicKey};
use std::time::Duration;
use tokio::time::sleep;

#[tokio::test]
async fn test_end_to_end_message_authentication() {
    // Test complete message authentication chain from crypto to protocol
    let config = ProtocolConfig::default();
    let mut coordinator = Coordinator::new(config).await.unwrap();
    
    coordinator.start().await.unwrap();
    
    // Get crypto manager for signature verification
    let crypto = coordinator.crypto_manager();
    assert!(crypto.is_some(), "Crypto manager should be available");
    
    // Send authenticated message
    let message = b"authenticated test message".to_vec();
    let result = coordinator.broadcast_message(message.clone()).await;
    assert!(result.is_ok(), "Authenticated message should be accepted");
    
    // Verify message was processed by DAG with proper authentication
    if let Some(dag) = coordinator.dag_manager() {
        assert!(dag.contains_message(&message));
        
        // Verify signature (placeholder implementation currently returns true)
        if let Some(crypto) = crypto {
            assert!(dag.verify_message(&message, crypto.public_key()));
        }
    }
    
    coordinator.stop().await.unwrap();
}

#[tokio::test]
async fn test_quantum_resistant_key_exchange() {
    // Test quantum-resistant key exchange between protocol instances
    let config1 = ProtocolConfig {
        network: qudag_protocol::config::NetworkConfig {
            port: 11001,
            max_peers: 10,
            connect_timeout: Duration::from_secs(5),
        },
        ..Default::default()
    };
    
    let config2 = ProtocolConfig {
        network: qudag_protocol::config::NetworkConfig {
            port: 11002,
            max_peers: 10,
            connect_timeout: Duration::from_secs(5),
        },
        ..Default::default()
    };
    
    let mut coordinator1 = Coordinator::new(config1).await.unwrap();
    let mut coordinator2 = Coordinator::new(config2).await.unwrap();
    
    coordinator1.start().await.unwrap();
    coordinator2.start().await.unwrap();
    
    // Verify both have quantum-resistant crypto managers
    assert!(coordinator1.crypto_manager().is_some());
    assert!(coordinator2.crypto_manager().is_some());
    
    // Test encrypted message exchange
    let message1 = b"quantum resistant message 1".to_vec();
    let message2 = b"quantum resistant message 2".to_vec();
    
    let result1 = coordinator1.broadcast_message(message1).await;
    let result2 = coordinator2.broadcast_message(message2).await;
    
    assert!(result1.is_ok());
    assert!(result2.is_ok());
    
    coordinator1.stop().await.unwrap();
    coordinator2.stop().await.unwrap();
}

#[tokio::test]
async fn test_anonymous_routing_integration() {
    // Test anonymous routing through the protocol stack
    let config = ProtocolConfig::default();
    let mut coordinator = Coordinator::new(config).await.unwrap();
    
    coordinator.start().await.unwrap();
    
    // Send messages that should be routed anonymously
    let anonymous_messages = vec![
        b"anonymous message 1".to_vec(),
        b"anonymous message 2".to_vec(),
        b"anonymous message 3".to_vec(),
    ];
    
    for message in &anonymous_messages {
        let result = coordinator.broadcast_message(message.clone()).await;
        assert!(result.is_ok(), "Anonymous message should be routed successfully");
    }
    
    // Verify messages were processed while maintaining anonymity
    if let Some(dag) = coordinator.dag_manager() {
        for message in &anonymous_messages {
            assert!(dag.contains_message(message));
        }
    }
    
    coordinator.stop().await.unwrap();
}

#[tokio::test]
async fn test_side_channel_resistance() {
    // Test protocol resistance to side-channel attacks
    let config = ProtocolConfig::default();
    let mut coordinator = Coordinator::new(config).await.unwrap();
    
    coordinator.start().await.unwrap();
    
    // Generate messages of varying sizes to test timing attack resistance
    let test_messages = vec![
        vec![1u8; 10],    // Small message
        vec![2u8; 100],   // Medium message
        vec![3u8; 1000],  // Large message
        vec![4u8; 10000], // Very large message
    ];
    
    let mut timings = Vec::new();
    
    for message in &test_messages {
        let start = std::time::Instant::now();
        let result = coordinator.broadcast_message(message.clone()).await;
        let duration = start.elapsed();
        
        assert!(result.is_ok());
        timings.push(duration);
    }
    
    // In a production implementation, we would verify that timing differences
    // don't reveal information about message content or processing
    // For now, just verify all messages were processed
    println!("Message processing timings: {:?}", timings);
    
    coordinator.stop().await.unwrap();
}

#[tokio::test]
async fn test_cryptographic_integrity_validation() {
    // Test cryptographic integrity validation throughout the protocol
    let config = ProtocolConfig::default();
    let mut coordinator = Coordinator::new(config).await.unwrap();
    
    coordinator.start().await.unwrap();
    
    // Test with various message types that exercise different crypto paths
    let integrity_test_messages = vec![
        b"integrity test 1".to_vec(),
        vec![0u8; 32],                    // All zeros
        vec![255u8; 32],                  // All ones
        (0..255).collect::<Vec<u8>>(),    // Sequential bytes
    ];
    
    for message in &integrity_test_messages {
        let result = coordinator.broadcast_message(message.clone()).await;
        assert!(result.is_ok(), "Integrity validation should pass for valid messages");
        
        // Verify cryptographic integrity through DAG
        if let Some(dag) = coordinator.dag_manager() {
            assert!(dag.contains_message(message));
            
            // Test signature verification
            if let Some(crypto) = coordinator.crypto_manager() {
                assert!(dag.verify_message(message, crypto.public_key()));
            }
        }
    }
    
    coordinator.stop().await.unwrap();
}

#[tokio::test]
async fn test_replay_attack_prevention() {
    // Test protocol prevention of replay attacks
    let config = ProtocolConfig::default();
    let mut coordinator = Coordinator::new(config).await.unwrap();
    
    coordinator.start().await.unwrap();
    
    // Send original message
    let original_message = b"original message for replay test".to_vec();
    let result1 = coordinator.broadcast_message(original_message.clone()).await;
    assert!(result1.is_ok());
    
    // Attempt to replay the same message
    let result2 = coordinator.broadcast_message(original_message.clone()).await;
    
    // Protocol should handle replay gracefully (either accept or reject consistently)
    assert!(result2.is_ok(), "Replay should be handled gracefully");
    
    // In a production implementation, we would verify that replayed messages
    // don't cause duplicate processing or state corruption
    if let Some(dag) = coordinator.dag_manager() {
        assert!(dag.contains_message(&original_message));
    }
    
    coordinator.stop().await.unwrap();
}

#[tokio::test]
async fn test_malicious_message_filtering() {
    // Test protocol filtering of malicious messages
    let config = ProtocolConfig::default();
    let mut coordinator = Coordinator::new(config).await.unwrap();
    
    coordinator.start().await.unwrap();
    
    // Test various types of potentially malicious messages
    let malicious_messages = vec![
        vec![0u8; 100_000],           // Oversized message
        vec![],                       // Empty message
        vec![0xAA; 16_777_216],       // Extremely large message (16MB)
    ];
    
    for (i, message) in malicious_messages.iter().enumerate() {
        let result = coordinator.broadcast_message(message.clone()).await;
        
        match result {
            Ok(_) => {
                // Message was accepted - verify system remains stable
                assert_eq!(coordinator.state().await, ProtocolState::Running);
                println!("Malicious message {} accepted but system stable", i);
            }
            Err(_) => {
                // Message was rejected - expected behavior
                println!("Malicious message {} rejected as expected", i);
            }
        }
    }
    
    // System should remain functional after malicious message attempts
    let normal_message = b"normal message after attack".to_vec();
    let result = coordinator.broadcast_message(normal_message).await;
    assert!(result.is_ok(), "Normal messages should work after malicious attempts");
    
    coordinator.stop().await.unwrap();
}

#[tokio::test]
async fn test_privacy_preserving_consensus() {
    // Test that consensus preserves privacy while maintaining correctness
    let config = ProtocolConfig::default();
    let mut coordinator = Coordinator::new(config).await.unwrap();
    
    coordinator.start().await.unwrap();
    
    // Send privacy-sensitive messages
    let private_messages = vec![
        b"private transaction 1".to_vec(),
        b"confidential data 2".to_vec(),
        b"sensitive information 3".to_vec(),
    ];
    
    for message in &private_messages {
        let result = coordinator.broadcast_message(message.clone()).await;
        assert!(result.is_ok(), "Private messages should be processed");
    }
    
    // Verify consensus was reached while preserving privacy
    // In production, this would verify that message content isn't exposed
    // during consensus but ordering and validity are maintained
    if let Some(dag) = coordinator.dag_manager() {
        for message in &private_messages {
            assert!(dag.contains_message(message));
        }
    }
    
    coordinator.stop().await.unwrap();
}

#[tokio::test]
async fn test_forward_secrecy() {
    // Test forward secrecy properties of the protocol
    let config = ProtocolConfig::default();
    let mut coordinator = Coordinator::new(config).await.unwrap();
    
    coordinator.start().await.unwrap();
    
    // Phase 1: Send messages with initial keys
    let phase1_messages = vec![
        b"phase 1 message 1".to_vec(),
        b"phase 1 message 2".to_vec(),
    ];
    
    for message in &phase1_messages {
        let result = coordinator.broadcast_message(message.clone()).await;
        assert!(result.is_ok());
    }
    
    sleep(Duration::from_millis(100)).await;
    
    // Phase 2: Key rotation would happen here in production
    // TODO: Implement key rotation mechanism
    
    // Phase 3: Send messages with new keys
    let phase2_messages = vec![
        b"phase 2 message 1".to_vec(),
        b"phase 2 message 2".to_vec(),
    ];
    
    for message in &phase2_messages {
        let result = coordinator.broadcast_message(message.clone()).await;
        assert!(result.is_ok());
    }
    
    // Verify all messages are accessible (forward secrecy doesn't affect current access)
    if let Some(dag) = coordinator.dag_manager() {
        for message in phase1_messages.iter().chain(phase2_messages.iter()) {
            assert!(dag.contains_message(message));
        }
    }
    
    coordinator.stop().await.unwrap();
}

#[tokio::test]
async fn test_cryptographic_protocol_compliance() {
    // Test compliance with cryptographic protocol specifications
    let config = ProtocolConfig::default();
    let mut coordinator = Coordinator::new(config).await.unwrap();
    
    coordinator.start().await.unwrap();
    
    // Verify crypto manager implements required algorithms
    if let Some(crypto) = coordinator.crypto_manager() {
        // Test public key format and size
        let public_key = crypto.public_key();
        assert!(!public_key.is_empty(), "Public key should not be empty");
        
        // In production, we would verify:
        // - ML-KEM-768 compliance
        // - ML-DSA compliance  
        // - Proper key derivation
        // - Algorithm parameter compliance
    }
    
    // Test message processing with cryptographic requirements
    let test_message = b"cryptographic compliance test".to_vec();
    let result = coordinator.broadcast_message(test_message.clone()).await;
    assert!(result.is_ok());
    
    // Verify cryptographic processing completed successfully
    if let Some(dag) = coordinator.dag_manager() {
        assert!(dag.contains_message(&test_message));
    }
    
    coordinator.stop().await.unwrap();
}