leptos-sync-core 0.9.0

//! Test-Driven Development tests for leptos-ws-pro integration
//! 
//! These tests define the expected behavior before implementation.
//! They should fail initially (Red phase) and pass after implementation (Green phase).

use super::{SyncTransport, TransportError};
use crate::transport::leptos_ws_pro_transport::{LeptosWsProTransport, LeptosWsProConfig};
use serde::{Deserialize, Serialize};
use std::time::Duration;
use tokio::time::timeout;

#[derive(Debug, Clone, Serialize, Deserialize)]
struct TestMessage {
    id: u64,
    content: String,
    timestamp: u64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
struct SyncData {
    changes: Vec<String>,
    client_id: String,
    sequence: u64,
}

/// Test configuration for leptos-ws-pro transport
pub type TestConfig = LeptosWsProConfig;

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

    /// Test 1: Transport Creation and Configuration
    /// 
    /// This test verifies that we can create a leptos-ws-pro transport
    /// with proper configuration and that it starts in a disconnected state.
    #[tokio::test]
    async fn test_transport_creation_and_initial_state() {
        let config = TestConfig::default();
        let transport = LeptosWsProTransport::new(config.clone());
        
        // Initially disconnected
        assert!(!transport.is_connected());
        
        // Should be able to get configuration
        assert_eq!(transport.url(), config.url);
    }

    /// Test 2: Connection Establishment
    /// 
    /// This test verifies that the transport can establish a connection
    /// to a WebSocket server and properly report connection status.
    #[tokio::test]
    async fn test_connection_establishment() {
        let config = TestConfig {
            url: "ws://invalid-url-that-does-not-exist:9999".to_string(),
            ..Default::default()
        };
        let transport = LeptosWsProTransport::new(config);
        
        // Attempt to connect (this will fail without a server, but should not panic)
        let result = timeout(Duration::from_secs(2), transport.connect()).await;
        
        // Should handle connection failure gracefully
        match result {
            Ok(Ok(())) => {
                // If connection succeeds, should be connected
                // Note: Current implementation is a stub, so this won't happen
                assert!(transport.is_connected());
            }
            Ok(Err(_)) => {
                // Connection failed as expected without server
                assert!(!transport.is_connected());
            }
            Err(_) => {
                // Timeout occurred
                assert!(!transport.is_connected());
            }
        }
    }

    /// Test 3: Message Sending (Text)
    /// 
    /// This test verifies that the transport can send text messages
    /// when connected to a server.
    #[tokio::test]
    async fn test_send_text_message() {
        let config = TestConfig::default();
        let transport = LeptosWsProTransport::new(config);
        
        let test_message = TestMessage {
            id: 1,
            content: "Hello, WebSocket!".to_string(),
            timestamp: chrono::Utc::now().timestamp() as u64,
        };
        
        let serialized = serde_json::to_vec(&test_message).unwrap();
        
        // Should handle send failure gracefully when not connected
        let result = transport.send(&serialized).await;
        assert!(result.is_err());
        
        // Error should be of expected type
        match result.unwrap_err() {
            TransportError::NotConnected => {
                // Expected error when not connected
            }
            _ => panic!("Unexpected error type"),
        }
    }

    /// Test 4: Message Sending (Binary)
    /// 
    /// This test verifies that the transport can send binary messages
    /// and handle different data types.
    #[tokio::test]
    async fn test_send_binary_message() {
        let config = TestConfig::default();
        let transport = LeptosWsProTransport::new(config);
        
        let sync_data = SyncData {
            changes: vec!["change1".to_string(), "change2".to_string()],
            client_id: "client_123".to_string(),
            sequence: 42,
        };
        
        let serialized = bincode::serialize(&sync_data).unwrap();
        
        // Should handle send failure gracefully when not connected
        let result = transport.send(&serialized).await;
        assert!(result.is_err());
    }

    /// Test 5: Message Receiving
    /// 
    /// This test verifies that the transport can receive messages
    /// and properly deserialize them.
    #[tokio::test]
    async fn test_receive_messages() {
        let config = TestConfig::default();
        let transport = LeptosWsProTransport::new(config);
        
        // Should return empty when not connected
        let result = transport.receive().await;
        assert!(result.is_ok());
        assert!(result.unwrap().is_empty());
    }

    /// Test 6: Reconnection Strategy
    /// 
    /// This test verifies that the transport implements proper
    /// reconnection logic with exponential backoff.
    #[tokio::test]
    async fn test_reconnection_strategy() {
        let config = TestConfig {
            max_reconnect_attempts: 2,
            ..Default::default()
        };
        let transport = LeptosWsProTransport::new(config);
        
        // Should handle reconnection attempts gracefully
        let start_time = std::time::Instant::now();
        let result = timeout(Duration::from_secs(10), transport.connect()).await;
        let elapsed = start_time.elapsed();
        
        // Should have attempted reconnection with backoff
        // (exact timing depends on implementation)
        assert!(elapsed > Duration::from_millis(100));
    }

    /// Test 7: Heartbeat Mechanism
    /// 
    /// This test verifies that the transport implements heartbeat
    /// to keep connections alive.
    #[tokio::test]
    async fn test_heartbeat_mechanism() {
        let config = TestConfig {
            heartbeat_interval: Duration::from_millis(100),
            ..Default::default()
        };
        let transport = LeptosWsProTransport::new(config.clone());
        
        // Should be able to configure heartbeat
        assert_eq!(transport.heartbeat_interval(), config.heartbeat_interval);
    }

    /// Test 8: Error Handling
    /// 
    /// This test verifies that the transport handles various error
    /// conditions gracefully.
    #[tokio::test]
    async fn test_error_handling() {
        let config = TestConfig {
            url: "ws://invalid-url-that-does-not-exist:9999".to_string(),
            ..Default::default()
        };
        let transport = LeptosWsProTransport::new(config);
        
        // Should handle connection errors gracefully
        let result = timeout(Duration::from_secs(2), transport.connect()).await;
        // Result should be Ok(Err(_)) for connection failure, not Ok(Ok(()))
        match result {
            Ok(Ok(())) => {
                // Connection succeeded (unexpected for invalid URL)
                assert!(transport.is_connected());
            }
            Ok(Err(_)) => {
                // Connection failed as expected
                assert!(!transport.is_connected());
            }
            Err(_) => {
                // Timeout occurred
                assert!(!transport.is_connected());
            }
        }
        
        // Should not be connected after failed attempt
        assert!(!transport.is_connected());
    }

    /// Test 9: Concurrent Operations
    /// 
    /// This test verifies that the transport can handle concurrent
    /// send/receive operations safely.
    #[tokio::test]
    async fn test_concurrent_operations() {
        let config = TestConfig::default();
        let transport = LeptosWsProTransport::new(config);
        
        let transport_clone = transport.clone();
        
        // Spawn concurrent send operations
        let send_handle = tokio::spawn(async move {
            let data = b"concurrent test message";
            transport_clone.send(data).await
        });
        
        let transport_clone2 = transport.clone();
        let receive_handle = tokio::spawn(async move {
            transport_clone2.receive().await
        });
        
        // Both operations should complete without panicking
        let (send_result, receive_result) = tokio::join!(send_handle, receive_handle);
        
        assert!(send_result.is_ok());
        assert!(receive_result.is_ok());
    }

    /// Test 10: Integration with Existing Transport Trait
    /// 
    /// This test verifies that the leptos-ws-pro transport properly
    /// implements the existing SyncTransport trait.
    #[tokio::test]
    async fn test_sync_transport_trait_compliance() {
        let config = TestConfig::default();
        let transport = LeptosWsProTransport::new(config);
        
        // Should implement SyncTransport trait
        assert!(!transport.is_connected());
        
        // Should handle trait methods without panicking
        let data = b"trait compliance test";
        let send_result = transport.send(data).await;
        assert!(send_result.is_err()); // Expected when not connected
        
        let receive_result = transport.receive().await;
        assert!(receive_result.is_ok());
    }

    /// Test 11: Message Protocol Compatibility
    /// 
    /// This test verifies that the transport can handle the existing
    /// message protocol used by leptos-sync.
    #[tokio::test]
    async fn test_message_protocol_compatibility() {
        let config = TestConfig::default();
        let transport = LeptosWsProTransport::new(config);
        
        // Test with existing sync message format
        let sync_message = serde_json::json!({
            "type": "sync",
            "peer_id": "test_peer",
            "data": {
                "changes": ["change1", "change2"],
                "client_id": "client_123",
                "sequence": 42
            },
            "timestamp": chrono::Utc::now().to_rfc3339()
        });
        
        let serialized = serde_json::to_vec(&sync_message).unwrap();
        
        // Should handle the message format without errors
        let result = transport.send(&serialized).await;
        assert!(result.is_err()); // Expected when not connected, but should not panic
    }

    /// Test 12: Performance Characteristics
    /// 
    /// This test verifies that the transport meets basic performance
    /// requirements for leptos-sync use cases.
    #[tokio::test]
    async fn test_performance_characteristics() {
        let config = TestConfig::default();
        let transport = LeptosWsProTransport::new(config);
        
        // Test message serialization/deserialization performance
        let test_data = vec![0u8; 1024]; // 1KB message
        
        let start_time = std::time::Instant::now();
        let result = transport.send(&test_data).await;
        let elapsed = start_time.elapsed();
        
        // Should handle 1KB messages quickly (under 1ms for local operations)
        assert!(elapsed < Duration::from_millis(1));
        assert!(result.is_err()); // Expected when not connected
    }
}

/// Integration tests that require a running WebSocket server
/// 
/// Note: These tests are disabled by default as they require external dependencies.
/// To run them, add the required dependencies to Cargo.toml and uncomment.
#[cfg(test)]
mod integration_tests_with_server {
    use super::*;

    /// Test 13: Full Integration with Test Server
    /// 
    /// This test requires a running WebSocket server and tests
    /// the complete send/receive cycle.
    #[tokio::test]
    #[ignore] // Ignored by default, run with: cargo test -- --ignored
    async fn test_full_integration_with_server() {
        // This test is disabled as it requires external WebSocket server dependencies
        // In a real implementation, this would test full WebSocket integration
        println!("Integration test with server is disabled - requires external dependencies");
    }
}