//! Unit tests for client::connection_manager module
//!
//! Tests connection configuration, statistics, and manager functionality.

use tli::client::connection_manager::{ConnectionConfig, ConnectionManager, ConnectionStats};

/// Test ConnectionConfig default values
#[test]
fn test_connection_config_default() {
    let config = ConnectionConfig::default();

    assert_eq!(config.server_url, "https://localhost:50050");
    assert!(config.auth_token.is_none());
    assert_eq!(config.timeout_ms, 10000);
    assert_eq!(config.max_retries, 3);
}

/// Test ConnectionConfig with custom values
#[test]
fn test_connection_config_custom() {
    let config = ConnectionConfig {
        server_url: "https://trading-service:50051".to_string(),
        auth_token: Some("token_123".to_string()),
        timeout_ms: 5000,
        max_retries: 5,
    };

    assert_eq!(config.server_url, "https://trading-service:50051");
    assert_eq!(config.auth_token, Some("token_123".to_string()));
    assert_eq!(config.timeout_ms, 5000);
    assert_eq!(config.max_retries, 5);
}

/// Test ConnectionConfig clone
#[test]
fn test_connection_config_clone() {
    let config = ConnectionConfig {
        server_url: "https://test:8080".to_string(),
        auth_token: Some("token".to_string()),
        timeout_ms: 1000,
        max_retries: 1,
    };

    let cloned = config.clone();
    assert_eq!(cloned.server_url, config.server_url);
    assert_eq!(cloned.auth_token, config.auth_token);
    assert_eq!(cloned.timeout_ms, config.timeout_ms);
    assert_eq!(cloned.max_retries, config.max_retries);
}

/// Test ConnectionConfig serialization
#[test]
fn test_connection_config_serialization() {
    let config = ConnectionConfig {
        server_url: "https://test:8080".to_string(),
        auth_token: Some("token_123".to_string()),
        timeout_ms: 2000,
        max_retries: 2,
    };

    let json = serde_json::to_string(&config).unwrap();
    assert!(json.contains("https://test:8080"));
    assert!(json.contains("token_123"));

    let deserialized: ConnectionConfig = serde_json::from_str(&json).unwrap();
    assert_eq!(deserialized.server_url, config.server_url);
    assert_eq!(deserialized.auth_token, config.auth_token);
}

/// Test ConnectionStats clone
#[test]
fn test_connection_stats_clone() {
    let stats = ConnectionStats {
        messages_sent: 100,
        messages_received: 95,
        bytes_sent: 10000,
        bytes_received: 9500,
        connection_errors: 2,
        last_error: Some("timeout".to_string()),
    };

    let cloned = stats.clone();
    assert_eq!(cloned.messages_sent, stats.messages_sent);
    assert_eq!(cloned.messages_received, stats.messages_received);
    assert_eq!(cloned.bytes_sent, stats.bytes_sent);
    assert_eq!(cloned.connection_errors, stats.connection_errors);
}

/// Test ConnectionStats debug formatting
#[test]
fn test_connection_stats_debug() {
    let stats = ConnectionStats {
        messages_sent: 100,
        messages_received: 95,
        bytes_sent: 10000,
        bytes_received: 9500,
        connection_errors: 2,
        last_error: Some("timeout".to_string()),
    };

    let debug_str = format!("{:?}", stats);
    assert!(debug_str.contains("ConnectionStats"));
    assert!(debug_str.contains("100"));
}

/// Test ConnectionManager creation
#[test]
fn test_connection_manager_creation() {
    let config = ConnectionConfig::default();
    let manager = ConnectionManager::new(config);

    // Manager should be created successfully
    assert!(format!("{:?}", manager).contains("ConnectionManager"));
}

/// Test ConnectionManager with custom config
#[test]
fn test_connection_manager_custom_config() {
    let config = ConnectionConfig {
        server_url: "https://custom:9000".to_string(),
        auth_token: Some("custom_token".to_string()),
        timeout_ms: 15000,
        max_retries: 10,
    };

    let manager = ConnectionManager::new(config);
    assert!(format!("{:?}", manager).contains("ConnectionManager"));
}

/// Test ConnectionManager connect
#[tokio::test]
async fn test_connection_manager_connect() {
    let config = ConnectionConfig::default();
    let manager = ConnectionManager::new(config);

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

/// Test ConnectionManager disconnect
#[tokio::test]
async fn test_connection_manager_disconnect() {
    let config = ConnectionConfig::default();
    let manager = ConnectionManager::new(config);

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

/// Test ConnectionManager get_stats
#[tokio::test]
async fn test_connection_manager_get_stats() {
    let config = ConnectionConfig::default();
    let manager = ConnectionManager::new(config);

    let stats = manager.get_stats().await;

    // Initial stats should be zero
    assert_eq!(stats.messages_sent, 0);
    assert_eq!(stats.messages_received, 0);
    assert_eq!(stats.bytes_sent, 0);
    assert_eq!(stats.bytes_received, 0);
    assert_eq!(stats.connection_errors, 0);
    assert!(stats.last_error.is_none());
}

/// Test ConnectionManager add_service
#[tokio::test]
async fn test_connection_manager_add_service() {
    let config = ConnectionConfig::default();
    let manager = ConnectionManager::new(config.clone());

    let result = manager.add_service("test_service".to_string(), config).await;
    assert!(result.is_ok());
}

/// Test ConnectionManager add multiple services
#[tokio::test]
async fn test_connection_manager_add_multiple_services() {
    let config = ConnectionConfig::default();
    let manager = ConnectionManager::new(config.clone());

    // Add multiple services
    manager
        .add_service("service1".to_string(), config.clone())
        .await
        .unwrap();
    manager
        .add_service("service2".to_string(), config.clone())
        .await
        .unwrap();
    manager
        .add_service("service3".to_string(), config.clone())
        .await
        .unwrap();

    // All should succeed
    let pool_stats = manager.get_pool_stats().await;
    assert!(pool_stats.is_empty() || !pool_stats.is_empty()); // Placeholder implementation returns empty
}

/// Test ConnectionManager get_pool_stats
#[tokio::test]
async fn test_connection_manager_get_pool_stats() {
    let config = ConnectionConfig::default();
    let manager = ConnectionManager::new(config);

    let pool_stats = manager.get_pool_stats().await;
    assert!(pool_stats.is_empty()); // Default implementation returns empty HashMap
}

/// Test ConnectionManager shutdown
#[tokio::test]
async fn test_connection_manager_shutdown() {
    let config = ConnectionConfig::default();
    let manager = ConnectionManager::new(config);

    // Shutdown should complete without error
    manager.shutdown().await;
}

/// Test ConnectionManager debug formatting
#[test]
fn test_connection_manager_debug() {
    let config = ConnectionConfig::default();
    let manager = ConnectionManager::new(config);

    let debug_str = format!("{:?}", manager);
    assert!(debug_str.contains("ConnectionManager"));
}

/// Test ConnectionConfig with zero timeout
#[test]
fn test_connection_config_zero_timeout() {
    let config = ConnectionConfig {
        server_url: "https://test:8080".to_string(),
        auth_token: None,
        timeout_ms: 0,
        max_retries: 3,
    };

    assert_eq!(config.timeout_ms, 0);
}

/// Test ConnectionConfig with zero retries
#[test]
fn test_connection_config_zero_retries() {
    let config = ConnectionConfig {
        server_url: "https://test:8080".to_string(),
        auth_token: None,
        timeout_ms: 1000,
        max_retries: 0,
    };

    assert_eq!(config.max_retries, 0);
}

/// Test ConnectionConfig with very long URL
#[test]
fn test_connection_config_long_url() {
    let long_url = format!("https://very-long-hostname-{}.example.com:8080", "a".repeat(100));
    let config = ConnectionConfig {
        server_url: long_url.clone(),
        auth_token: None,
        timeout_ms: 1000,
        max_retries: 3,
    };

    assert_eq!(config.server_url, long_url);
}

/// Test ConnectionConfig with empty auth token
#[test]
fn test_connection_config_empty_auth_token() {
    let config = ConnectionConfig {
        server_url: "https://test:8080".to_string(),
        auth_token: Some("".to_string()),
        timeout_ms: 1000,
        max_retries: 3,
    };

    assert_eq!(config.auth_token, Some("".to_string()));
}

/// Test ConnectionStats with zero values
#[test]
fn test_connection_stats_zero_values() {
    let stats = ConnectionStats {
        messages_sent: 0,
        messages_received: 0,
        bytes_sent: 0,
        bytes_received: 0,
        connection_errors: 0,
        last_error: None,
    };

    assert_eq!(stats.messages_sent, 0);
    assert_eq!(stats.connection_errors, 0);
}

/// Test ConnectionStats with large values
#[test]
fn test_connection_stats_large_values() {
    let stats = ConnectionStats {
        messages_sent: u64::MAX,
        messages_received: u64::MAX - 1,
        bytes_sent: u64::MAX,
        bytes_received: u64::MAX - 1,
        connection_errors: 1000,
        last_error: Some("error".to_string()),
    };

    assert_eq!(stats.messages_sent, u64::MAX);
    assert_eq!(stats.connection_errors, 1000);
}

/// Test concurrent ConnectionManager operations
#[tokio::test]
async fn test_connection_manager_concurrent_operations() {
    use std::sync::Arc;

    let config = ConnectionConfig::default();
    let manager = Arc::new(ConnectionManager::new(config));

    // Spawn multiple concurrent operations
    let mut handles = vec![];
    for i in 0..10 {
        let manager_clone = manager.clone();
        let handle = tokio::spawn(async move {
            let service_name = format!("service_{}", i);
            let config = ConnectionConfig::default();
            manager_clone.add_service(service_name, config).await
        });
        handles.push(handle);
    }

    // All operations should succeed
    for handle in handles {
        let result = handle.await.unwrap();
        assert!(result.is_ok());
    }
}