Cross Platform Universal Applications（1751410386791500）

use hyperlane::*;
use hyperlane_macros::*;
use std::collections::HashMap;
use serde::{Deserialize, Serialize};

// Cross-platform configuration management
#[derive(Clone, Debug)]
struct PlatformConfig {
    platform_info: PlatformInfo,
    deployment_config: DeploymentConfig,
    feature_flags: HashMap<String, bool>,
    environment_variables: HashMap<String, String>,
}

#[derive(Clone, Debug)]
struct PlatformInfo {
    os_type: OperatingSystem,
    architecture: Architecture,
    runtime_version: String,
    available_memory: u64,
    cpu_cores: u32,
}

#[derive(Clone, Debug)]
enum OperatingSystem {
    Linux,
    Windows,
    MacOS,
    FreeBSD,
    Unknown(String),
}

#[derive(Clone, Debug)]
enum Architecture {
    X86_64,
    ARM64,
    X86,
    ARM,
    Unknown(String),
}

#[derive(Clone, Debug)]
struct DeploymentConfig {
    container_runtime: Option<String>,
    service_port: u16,
    health_check_endpoint: String,
    log_level: LogLevel,
    max_connections: usize,
    request_timeout: std::time::Duration,
}

#[derive(Clone, Debug)]
enum LogLevel {
    Error,
    Warn,
    Info,
    Debug,
    Trace,
}

impl PlatformConfig {
    fn detect_platform() -> Self {
        let platform_info = Self::detect_platform_info();
        let deployment_config = Self::create_deployment_config(&platform_info);
        let feature_flags = Self::load_feature_flags(&platform_info);
        let environment_variables = Self::load_environment_variables();

        Self {
            platform_info,
            deployment_config,
            feature_flags,
            environment_variables,
        }
    }

    fn detect_platform_info() -> PlatformInfo {
        let os_type = match std::env::consts::OS {
            "linux" => OperatingSystem::Linux,
            "windows" => OperatingSystem::Windows,
            "macos" => OperatingSystem::MacOS,
            "freebsd" => OperatingSystem::FreeBSD,
            other => OperatingSystem::Unknown(other.to_string()),
        };

        let architecture = match std::env::consts::ARCH {
            "x86_64" => Architecture::X86_64,
            "aarch64" => Architecture::ARM64,
            "x86" => Architecture::X86,
            "arm" => Architecture::ARM,
            other => Architecture::Unknown(other.to_string()),
        };

        PlatformInfo {
            os_type,
            architecture,
            runtime_version: env!("CARGO_PKG_VERSION").to_string(),
            available_memory: Self::get_available_memory(),
            cpu_cores: num_cpus::get() as u32,
        }
    }

    fn get_available_memory() -> u64 {
        // Simplified memory detection
        match std::env::var("MEMORY_LIMIT") {
            Ok(limit) => limit.parse().unwrap_or(1024 * 1024 * 1024), // Default 1GB
            Err(_) => {
                // Try to detect system memory
                #[cfg(target_os = "linux")]
                {
                    if let Ok(meminfo) = std::fs::read_to_string("/proc/meminfo") {
                        for line in meminfo.lines() {
                            if line.starts_with("MemTotal:") {
                                if let Some(kb_str) = line.split_whitespace().nth(1) {
                                    if let Ok(kb) = kb_str.parse::<u64>() {
                                        return kb * 1024; // Convert KB to bytes
                                    }
                                }
                            }
                        }
                    }
                }

                // Default fallback
                2 * 1024 * 1024 * 1024 // 2GB
            }
        }
    }

    fn create_deployment_config(platform_info: &PlatformInfo) -> DeploymentConfig {
        let base_port = 8080;
        let port = std::env::var("PORT")
            .ok()
            .and_then(|p| p.parse().ok())
            .unwrap_or(base_port);

        let max_connections = match platform_info.available_memory {
            mem if mem > 4 * 1024 * 1024 * 1024 => 10000, // > 4GB
            mem if mem > 2 * 1024 * 1024 * 1024 => 5000,  // > 2GB
            mem if mem > 1024 * 1024 * 1024 => 2000,      // > 1GB
            _ => 1000,                                      // <= 1GB
        };

        let log_level = match std::env::var("LOG_LEVEL").as_deref() {
            Ok("error") => LogLevel::Error,
            Ok("warn") => LogLevel::Warn,
            Ok("info") => LogLevel::Info,
            Ok("debug") => LogLevel::Debug,
            Ok("trace") => LogLevel::Trace,
            _ => LogLevel::Info,
        };

        DeploymentConfig {
            container_runtime: std::env::var("CONTAINER_RUNTIME").ok(),
            service_port: port,
            health_check_endpoint: "/health".to_string(),
            log_level,
            max_connections,
            request_timeout: std::time::Duration::from_secs(30),
        }
    }

    fn load_feature_flags(platform_info: &PlatformInfo) -> HashMap<String, bool> {
        let mut flags = HashMap::new();

        // Platform-specific feature flags
        match platform_info.os_type {
            OperatingSystem::Linux => {
                flags.insert("epoll_support".to_string(), true);
                flags.insert("sendfile_support".to_string(), true);
            }
            OperatingSystem::Windows => {
                flags.insert("iocp_support".to_string(), true);
                flags.insert("windows_service".to_string(), true);
            }
            OperatingSystem::MacOS => {
                flags.insert("kqueue_support".to_string(), true);
                flags.insert("macos_optimizations".to_string(), true);
            }
            _ => {}
        }

        // Architecture-specific flags
        match platform_info.architecture {
            Architecture::ARM64 => {
                flags.insert("arm_optimizations".to_string(), true);
            }
            Architecture::X86_64 => {
                flags.insert("x64_optimizations".to_string(), true);
                flags.insert("simd_support".to_string(), true);
            }
            _ => {}
        }

        // Memory-based flags
        if platform_info.available_memory > 4 * 1024 * 1024 * 1024 {
            flags.insert("high_memory_mode".to_string(), true);
            flags.insert("large_buffer_pool".to_string(), true);
        }

        // CPU-based flags
        if platform_info.cpu_cores >= 8 {
            flags.insert("multi_threaded_processing".to_string(), true);
        }

        // Environment-based flags
        if std::env::var("ENABLE_METRICS").is_ok() {
            flags.insert("metrics_collection".to_string(), true);
        }

        if std::env::var("ENABLE_TRACING").is_ok() {
            flags.insert("distributed_tracing".to_string(), true);
        }

        flags
    }

    fn load_environment_variables() -> HashMap<String, String> {
        std::env::vars().collect()
    }

    fn is_feature_enabled(&self, feature: &str) -> bool {
        self.feature_flags.get(feature).copied().unwrap_or(false)
    }

    fn get_env_var(&self, key: &str) -> Option<&String> {
        self.environment_variables.get(key)
    }
}

// Cross-platform service manager
struct UniversalServiceManager {
    config: PlatformConfig,
    health_status: std::sync::Arc<std::sync::RwLock<HealthStatus>>,
    metrics: std::sync::Arc<std::sync::RwLock<ServiceMetrics>>,
}

#[derive(Clone, Debug)]
struct HealthStatus {
    status: ServiceStatus,
    last_check: chrono::DateTime<chrono::Utc>,
    uptime: std::time::Duration,
    checks: HashMap<String, CheckResult>,
}

#[derive(Clone, Debug)]
enum ServiceStatus {
    Healthy,
    Degraded,
    Unhealthy,
    Starting,
    Stopping,
}

#[derive(Clone, Debug)]
struct CheckResult {
    name: String,
    status: bool,
    message: String,
    duration: std::time::Duration,
}

#[derive(Clone, Debug, Default)]
struct ServiceMetrics {
    requests_total: u64,
    requests_per_second: f64,
    average_response_time: std::time::Duration,
    error_rate: f64,
    memory_usage: u64,
    cpu_usage: f64,
    active_connections: u64,
}

impl UniversalServiceManager {
    fn new() -> Self {
        let config = PlatformConfig::detect_platform();

        Self {
            config,
            health_status: std::sync::Arc::new(std::sync::RwLock::new(HealthStatus {
                status: ServiceStatus::Starting,
                last_check: chrono::Utc::now(),
                uptime: std::time::Duration::ZERO,
                checks: HashMap::new(),
            })),
            metrics: std::sync::Arc::new(std::sync::RwLock::new(ServiceMetrics::default())),
        }
    }

    async fn start_service(&self) -> Result<(), String> {
        println!("Starting universal service...");
        println!("Platform: {:?}", self.config.platform_info.os_type);
        println!("Architecture: {:?}", self.config.platform_info.architecture);
        println!("Port: {}", self.config.deployment_config.service_port);
        println!("Max connections: {}", self.config.deployment_config.max_connections);

        // Platform-specific initialization
        self.initialize_platform_specific_features().await?;

        // Start health monitoring
        self.start_health_monitoring().await;

        // Update status
        {
            let mut health = self.health_status.write().unwrap();
            health.status = ServiceStatus::Healthy;
            health.last_check = chrono::Utc::now();
        }

        Ok(())
    }

    async fn initialize_platform_specific_features(&self) -> Result<(), String> {
        if self.config.is_feature_enabled("epoll_support") {
            println!("Initializing epoll support for Linux");
        }

        if self.config.is_feature_enabled("iocp_support") {
            println!("Initializing IOCP support for Windows");
        }

        if self.config.is_feature_enabled("kqueue_support") {
            println!("Initializing kqueue support for macOS");
        }

        if self.config.is_feature_enabled("high_memory_mode") {
            println!("Enabling high memory mode optimizations");
        }

        if self.config.is_feature_enabled("multi_threaded_processing") {
            println!("Enabling multi-threaded processing");
        }

        Ok(())
    }

    async fn start_health_monitoring(&self) {
        let health_status = self.health_status.clone();
        let config = self.config.clone();

        tokio::spawn(async move {
            let mut interval = tokio::time::interval(std::time::Duration::from_secs(30));
            let start_time = std::time::Instant::now();

            loop {
                interval.tick().await;

                let mut checks = HashMap::new();

                // Memory check
                let memory_check = Self::check_memory_usage(&config).await;
                checks.insert("memory".to_string(), memory_check);

                // Disk space check
                let disk_check = Self::check_disk_space().await;
                checks.insert("disk".to_string(), disk_check);

                // Network connectivity check
                let network_check = Self::check_network_connectivity().await;
                checks.insert("network".to_string(), network_check);

                // Update health status
                {
                    let mut health = health_status.write().unwrap();
                    health.last_check = chrono::Utc::now();
                    health.uptime = start_time.elapsed();
                    health.checks = checks.clone();

                    // Determine overall status
                    let all_healthy = checks.values().all(|check| check.status);
                    health.status = if all_healthy {
                        ServiceStatus::Healthy
                    } else {
                        ServiceStatus::Degraded
                    };
                }
            }
        });
    }

    async fn check_memory_usage(config: &PlatformConfig) -> CheckResult {
        let start = std::time::Instant::now();

        // Simplified memory check
        let available_memory = config.platform_info.available_memory;
        let threshold = available_memory / 10; // 10% threshold

        CheckResult {
            name: "memory_usage".to_string(),
            status: true, // Simplified - always pass
            message: format!("Memory usage within limits ({}MB available)", available_memory / 1024 / 1024),
            duration: start.elapsed(),
        }
    }

    async fn check_disk_space() -> CheckResult {
        let start = std::time::Instant::now();

        CheckResult {
            name: "disk_space".to_string(),
            status: true, // Simplified - always pass
            message: "Disk space sufficient".to_string(),
            duration: start.elapsed(),
        }
    }

    async fn check_network_connectivity() -> CheckResult {
        let start = std::time::Instant::now();

        CheckResult {
            name: "network_connectivity".to_string(),
            status: true, // Simplified - always pass
            message: "Network connectivity OK".to_string(),
            duration: start.elapsed(),
        }
    }

    fn get_health_status(&self) -> HealthStatus {
        self.health_status.read().unwrap().clone()
    }

    fn get_metrics(&self) -> ServiceMetrics {
        self.metrics.read().unwrap().clone()
    }

    fn get_platform_info(&self) -> &PlatformConfig {
        &self.config
    }
}

static SERVICE_MANAGER: once_cell::sync::Lazy<UniversalServiceManager> =
    once_cell::sync::Lazy::new(|| UniversalServiceManager::new());

// Universal endpoints
#[get]
async fn health_endpoint(ctx: Context) {
    let health_status = SERVICE_MANAGER.get_health_status();

    let status_code = match health_status.status {
        ServiceStatus::Healthy => 200,
        ServiceStatus::Degraded => 200,
        ServiceStatus::Unhealthy => 503,
        ServiceStatus::Starting => 503,
        ServiceStatus::Stopping => 503,
    };

    ctx.set_response_status_code(status_code)
        .await
        .set_response_header(CONTENT_TYPE, APPLICATION_JSON)
        .await
        .set_response_body(serde_json::to_string(&health_status).unwrap())
        .await;
}

#[get]
async fn metrics_endpoint(ctx: Context) {
    let metrics = SERVICE_MANAGER.get_metrics();

    ctx.set_response_status_code(200)
        .await
        .set_response_header(CONTENT_TYPE, APPLICATION_JSON)
        .await
        .set_response_body(serde_json::to_string(&metrics).unwrap())
        .await;
}

#[get]
async fn platform_info_endpoint(ctx: Context) {
    let platform_config = SERVICE_MANAGER.get_platform_info();

    let response = serde_json::json!({
        "platform_info": platform_config.platform_info,
        "deployment_config": platform_config.deployment_config,
        "feature_flags": platform_config.feature_flags,
        "environment_count": platform_config.environment_variables.len()
    });

    ctx.set_response_status_code(200)
        .await
        .set_response_header(CONTENT_TYPE, APPLICATION_JSON)
        .await
        .set_response_body(serde_json::to_string(&response).unwrap())
        .await;
}

#[get]
async fn readiness_endpoint(ctx: Context) {
    let health_status = SERVICE_MANAGER.get_health_status();

    let is_ready = matches!(health_status.status, ServiceStatus::Healthy | ServiceStatus::Degraded);

    let response = serde_json::json!({
        "ready": is_ready,
        "status": format!("{:?}", health_status.status),
        "uptime_seconds": health_status.uptime.as_secs()
    });

    let status_code = if is_ready { 200 } else { 503 };

    ctx.set_response_status_code(status_code)
        .await
        .set_response_header(CONTENT_TYPE, APPLICATION_JSON)
        .await
        .set_response_body(serde_json::to_string(&response).unwrap())
        .await;
}

#[get]
async fn liveness_endpoint(ctx: Context) {
    // Simple liveness check - if we can respond, we're alive
    let response = serde_json::json!({
        "alive": true,
        "timestamp": chrono::Utc::now().timestamp()
    });

    ctx.set_response_status_code(200)
        .await
        .set_response_header(CONTENT_TYPE, APPLICATION_JSON)
        .await
        .set_response_body(serde_json::to_string(&response).unwrap())
        .await;
}

// Cross-platform deployment utilities
#[derive(Serialize)]
struct DeploymentInfo {
    platform: String,
    architecture: String,
    version: String,
    build_time: String,
    git_commit: Option<String>,
    container_info: Option<ContainerInfo>,
}

#[derive(Serialize)]
struct ContainerInfo {
    runtime: String,
    image_id: Option<String>,
    container_id: Option<String>,
}

#[get]
async fn deployment_info_endpoint(ctx: Context) {
    let platform_config = SERVICE_MANAGER.get_platform_info();

    let deployment_info = DeploymentInfo {
        platform: format!("{:?}", platform_config.platform_info.os_type),
        architecture: format!("{:?}", platform_config.platform_info.architecture),
        version: platform_config.platform_info.runtime_version.clone(),
        build_time: env!("BUILD_TIME").to_string(),
        git_commit: option_env!("GIT_COMMIT").map(|s| s.to_string()),
        container_info: platform_config.deployment_config.container_runtime.as_ref().map(|runtime| {
            ContainerInfo {
                runtime: runtime.clone(),
                image_id: std::env::var("IMAGE_ID").ok(),
                container_id: std::env::var("CONTAINER_ID").ok(),
            }
        }),
    };

    ctx.set_response_status_code(200)
        .await
        .set_response_header(CONTENT_TYPE, APPLICATION_JSON)
        .await
        .set_response_body(serde_json::to_string(&deployment_info).unwrap())
        .await;
}