//! 网关接入测试
//! 
//! 测试网关在分层架构中的作用：负载均衡、故障转移、接入优化

use multi_agent_oracle::test::{LocalTestConfig, LocalTestNodeManager};

/// 测试网关接入功能
#[tokio::test]
async fn test_gateway_access_functionality() {
    println!("🧪 测试网关接入功能");
    
    // 加载测试配置
    let config = load_test_config();
    
    // 验证网关配置
    println!("  验证网关配置:");
    if let Some(gateways) = &config.gateways {
        println!("    轻节点网关: {} 个", gateways.light_gateway_count);
        println!("    移动网关: {} 个", gateways.mobile_gateway_count);
        println!("    网关模拟: {}", gateways.enable_gateway_simulation);
        
        assert!(gateways.light_gateway_count > 0, "至少需要一个轻节点网关");
        assert!(gateways.mobile_gateway_count > 0, "至少需要一个移动网关");
    } else {
        println!("    ⚠️  网关配置未找到");
    }
    
    // 创建测试节点管理器
    let manager = LocalTestNodeManager::initialize_test_nodes(&config).await.unwrap();
    
    // 测试网关接入
    println!("\n🚪 测试网关接入流程:");
    
    match manager.test_gateway_access().await {
        Ok(result) => {
            println!("    网关测试结果:");
            println!("      连接成功率: {:.1}%", result.connection_success_rate * 100.0);
            println!("      平均响应时间: {:.1}ms", result.average_response_time_ms);
            println!("      故障恢复成功率: {:.1}%", result.fault_recovery_success_rate * 100.0);
            
            // 验证网关性能
            assert!(result.connection_success_rate > 0.8, "连接成功率应大于80%");
            assert!(result.average_response_time_ms < 200.0, "平均响应时间应小于200ms");
            assert!(result.fault_recovery_success_rate > 0.7, "故障恢复成功率应大于70%");
            
            println!("  ✅ 网关接入测试通过");
        }
        Err(e) => {
            println!("  ❌ 网关接入测试失败: {}", e);
            panic!("网关测试失败: {}", e);
        }
    }
    
    // 测试网关负载均衡
    println!("\n⚖️  测试网关负载均衡:");
    test_gateway_load_balancing(&manager).await;
    
    // 测试网关故障转移
    println!("\n🔄 测试网关故障转移:");
    test_gateway_failover(&manager).await;
    
    // 测试不同网关类型
    println!("\n📱 测试不同网关类型:");
    test_gateway_types(&manager).await;
    
    // 测试网关性能监控
    println!("\n📊 测试网关性能监控:");
    test_gateway_performance_monitoring(&manager).await;
    
    println!("\n🎉 网关接入功能测试完成!");
}

/// 测试网关负载均衡
async fn test_gateway_load_balancing(manager: &LocalTestNodeManager) {
    println!("  模拟负载均衡场景:");
    
    // 模拟不同负载情况
    let load_scenarios = vec![
        ("低负载", 0.3),
        ("中等负载", 0.6),
        ("高负载", 0.9),
    ];
    
    for (scenario_name, load_level) in load_scenarios {
        println!("\n    场景: {} (负载级别: {:.0}%)", scenario_name, load_level * 100.0);
        
        let result = simulate_gateway_load_balancing(load_level).await;
        
        println!("      平均响应时间: {:.1}ms", result.avg_response_time_ms);
        println!("      连接成功率: {:.1}%", result.connection_success_rate * 100.0);
        println!("      负载分布均匀度: {:.2}", result.load_distribution_score);
        
        // 验证负载均衡效果
        assert!(result.avg_response_time_ms < 300.0, "响应时间应在合理范围内");
        assert!(result.connection_success_rate > 0.7, "连接成功率应大于70%");
        assert!(result.load_distribution_score > 0.6, "负载分布应相对均匀");
        
        println!("      ✅ 通过");
    }
    
    println!("  ✅ 网关负载均衡测试完成");
}

/// 测试网关故障转移
async fn test_gateway_failover(manager: &LocalTestNodeManager) {
    println!("  模拟故障转移场景:");
    
    // 模拟不同故障场景
    let failure_scenarios = vec![
        ("单网关故障", 1),
        ("多网关故障", 2),
        ("网络分区", 3),
    ];
    
    for (scenario_name, failure_level) in failure_scenarios {
        println!("\n    场景: {}", scenario_name);
        
        let result = simulate_gateway_failover(failure_level).await;
        
        println!("      故障检测时间: {:.1}ms", result.failure_detection_time_ms);
        println!("      恢复时间: {:.1}ms", result.recovery_time_ms);
        println!("      数据丢失率: {:.1}%", result.data_loss_rate * 100.0);
        println!("      服务可用性: {:.1}%", result.service_availability * 100.0);
        
        // 验证故障转移效果
        assert!(result.failure_detection_time_ms < 1000.0, "故障检测应快速");
        assert!(result.recovery_time_ms < 5000.0, "恢复时间应在合理范围内");
        assert!(result.data_loss_rate < 0.1, "数据丢失率应小于10%");
        assert!(result.service_availability > 0.8, "服务可用性应大于80%");
        
        println!("      ✅ 通过");
    }
    
    println!("  ✅ 网关故障转移测试完成");
}

/// 测试不同网关类型
async fn test_gateway_types(manager: &LocalTestNodeManager) {
    println!("  测试不同网关类型特性:");
    
    let gateway_types = vec![
        ("轻节点网关", GatewayType::Light),
        ("移动网关", GatewayType::Mobile),
        ("企业网关", GatewayType::Enterprise),
    ];
    
    for (type_name, gateway_type) in gateway_types {
        println!("\n    类型: {}", type_name);
        
        let characteristics = get_gateway_characteristics(gateway_type);
        
        println!("      最大连接数: {}", characteristics.max_connections);
        println!("      优化特性: {}", characteristics.optimization_features);
        println!("      适用场景: {}", characteristics.use_cases);
        println!("      性能评分: {}/10", characteristics.performance_score);
        
        // 验证网关特性
        assert!(characteristics.max_connections > 0, "网关必须有连接能力");
        assert!(characteristics.performance_score >= 5, "网关性能评分应合理");
        
        println!("      ✅ 通过");
    }
    
    println!("  ✅ 不同网关类型测试完成");
}

/// 测试网关性能监控
async fn test_gateway_performance_monitoring(manager: &LocalTestNodeManager) {
    println!("  测试网关性能监控:");
    
    // 模拟性能监控数据
    let monitoring_data = simulate_gateway_monitoring().await;
    
    println!("    性能指标:");
    println!("      平均CPU使用率: {:.1}%", monitoring_data.avg_cpu_usage);
    println!("      平均内存使用率: {:.1}%", monitoring_data.avg_memory_usage);
    println!("      网络吞吐量: {:.1} Mbps", monitoring_data.network_throughput_mbps);
    println!("      请求处理速率: {:.0} req/s", monitoring_data.request_rate);
    println!("      错误率: {:.2}%", monitoring_data.error_rate * 100.0);
    
    // 验证性能指标
    assert!(monitoring_data.avg_cpu_usage < 80.0, "CPU使用率应在合理范围内");
    assert!(monitoring_data.avg_memory_usage < 70.0, "内存使用率应在合理范围内");
    assert!(monitoring_data.error_rate < 0.05, "错误率应小于5%");
    
    // 测试告警机制
    println!("\n    测试告警机制:");
    let alerts = test_gateway_alerts(&monitoring_data).await;
    
    for alert in alerts {
        println!("      {}: {}", alert.level, alert.message);
        assert!(alert.level != "critical" || monitoring_data.error_rate > 0.1, 
                "严重告警应有相应条件");
    }
    
    println!("  ✅ 网关性能监控测试完成");
}

/// 模拟网关负载均衡
async fn simulate_gateway_load_balancing(load_level: f64) -> LoadBalancingResult {
    // 模拟负载均衡结果
    LoadBalancingResult {
        avg_response_time_ms: 50.0 + load_level * 100.0, // 负载越高，响应越慢
        connection_success_rate: 0.95 - load_level * 0.2, // 负载越高，成功率越低
        load_distribution_score: 0.8 - load_level * 0.1, // 负载越高，分布越不均匀
        gateway_utilization: vec![
            load_level * 0.8,
            load_level * 0.9,
            load_level * 0.7,
        ],
    }
}

/// 模拟网关故障转移
async fn simulate_gateway_failover(failure_level: u32) -> FailoverResult {
    // 模拟故障转移结果
    FailoverResult {
        failure_detection_time_ms: 200.0 * failure_level as f64,
        recovery_time_ms: 1000.0 * failure_level as f64,
        data_loss_rate: 0.02 * failure_level as f64,
        service_availability: 0.95 - 0.1 * failure_level as f64,
        affected_gateways: failure_level,
    }
}

/// 获取网关特性
fn get_gateway_characteristics(gateway_type: GatewayType) -> GatewayCharacteristics {
    match gateway_type {
        GatewayType::Light => GatewayCharacteristics {
            max_connections: 100,
            optimization_features: "低延迟、高并发".to_string(),
            use_cases: "轻节点接入、API网关".to_string(),
            performance_score: 8,
        },
        GatewayType::Mobile => GatewayCharacteristics {
            max_connections: 50,
            optimization_features: "移动网络优化、省电模式".to_string(),
            use_cases: "移动设备接入、实时推送".to_string(),
            performance_score: 7,
        },
        GatewayType::Enterprise => GatewayCharacteristics {
            max_connections: 1000,
            optimization_features: "高可用、负载均衡、安全加密".to_string(),
            use_cases: "企业级应用、大数据处理".to_string(),
            performance_score: 9,
        },
    }
}

/// 模拟网关监控
async fn simulate_gateway_monitoring() -> MonitoringData {
    MonitoringData {
        avg_cpu_usage: 45.3,
        avg_memory_usage: 62.7,
        network_throughput_mbps: 125.8,
        request_rate: 850.0,
        error_rate: 0.012,
        active_connections: 75,
        gateway_count: 3,
    }
}

/// 测试网关告警
async fn test_gateway_alerts(monitoring_data: &MonitoringData) -> Vec<GatewayAlert> {
    let mut alerts = Vec::new();
    
    if monitoring_data.avg_cpu_usage > 80.0 {
        alerts.push(GatewayAlert {
            level: "warning".to_string(),
            message: "CPU使用率过高".to_string(),
            gateway_id: "gateway1".to_string(),
        });
    }
    
    if monitoring_data.error_rate > 0.05 {
        alerts.push(GatewayAlert {
            level: "error".to_string(),
            message: "错误率过高".to_string(),
            gateway_id: "gateway2".to_string(),
        });
    }
    
    if monitoring_data.active_connections as f32 / monitoring_data.gateway_count as f32 > 30.0 {
        alerts.push(GatewayAlert {
            level: "info".to_string(),
            message: "连接数接近上限".to_string(),
            gateway_id: "gateway3".to_string(),
        });
    }
    
    alerts
}

/// 加载测试配置
fn load_test_config() -> LocalTestConfig {
    let config_path = "config/local_test.toml";
    
    match LocalTestConfig::from_file(config_path) {
        Ok(config) => config,
        Err(_) => {
            // 创建默认配置
            use std::fs;
            
            let config_content = r#"[test_environment]
name = "local_hierarchical_test"
node_count = 10
simulate_network_latency = true
enable_diap_mock = true

[nodes]
node1 = { tier = "core", reputation = 850, stake = "1.0" }
node2 = { tier = "core", reputation = 820, stake = "0.8" }
node3 = { tier = "validator", reputation = 650, stake = "0.5" }
node4 = { tier = "validator", reputation = 580, stake = "0.4" }
node5 = { tier = "validator", reputation = 520, stake = "0.3" }
node6 = { tier = "data", reputation = 350, stake = "0.2" }
node7 = { tier = "data", reputation = 280, stake = "0.15" }
node8 = { tier = "data", reputation = 220, stake = "0.1" }
node9 = { tier = "data", reputation = 150, stake = "0.05" }
node10 = { tier = "data", reputation = 80, stake = "0.02" }

[gateways]
light_gateway_count = 2
mobile_gateway_count = 1
enable_gateway_simulation = true

[apis]
diap_sdk_endpoint = "http://localhost:8080/diap"
data_api_mock = true
prompt_support = true
"#;
            
            fs::create_dir_all("config").unwrap();
            fs::write(config_path, config_content).unwrap();
            println!("  📝 创建默认配置文件: {}", config_path);
            
            LocalTestConfig::from_file(config_path).unwrap()
        }
    }
}

/// 网关类型
enum GatewayType {
    Light,
    Mobile,
    Enterprise,
}

/// 负载均衡结果
struct LoadBalancingResult {
    avg_response_time_ms: f64,
    connection_success_rate: f64,
    load_distribution_score: f64,
    gateway_utilization: Vec<f64>,
}

/// 故障转移结果
struct FailoverResult {
    failure_detection_time_ms: f64,
    recovery_time_ms: f64,
    data_loss_rate: f64,
    service_availability: f64,
    affected_gateways: u32,
}

/// 网关特性
struct GatewayCharacteristics {
    max_connections: u32,
    optimization_features: String,
    use_cases: String,
    performance_score: u8,
}

/// 监控数据
struct MonitoringData {
    avg_cpu_usage: f64,
    avg_memory_usage: f64,
    network_throughput_mbps: f64,
    request_rate: f64,
    error_rate: f64,
    active_connections: u32,
    gateway_count: u32,
}

/// 网关告警
struct GatewayAlert {
    level: String,
    message: String,
    gateway_id: String,
}

/// 主测试函数
#[tokio::test]
async fn test_complete_gateway_system() {
    println!("🚀 测试完整网关系统");
    
    // 运行所有网关测试
    test_gateway_access_functionality().await;
    
    println!("\n🎉 所有网关系统测试完成!");
}
