zc2 0.0.27

//! System information and cluster detection.
//!
//! Provides diagnostics about available compute backends and network status.

use std::net::TcpStream;
use std::time::Duration;

use colored::Colorize;

/// Cluster information
#[derive(Debug, Clone)]
pub struct ClusterInfo {
    pub name: &'static str,
    pub uri: String,
    pub available: bool,
    pub version: Option<String>,
    pub nodes: Option<u32>,
}

/// Network information
#[derive(Debug, Clone)]
pub struct NetworkInfo {
    pub local_ip: Option<String>,
    pub wireguard_ip: Option<String>,
    pub hostname: String,
    pub mode: NetworkMode,
}

#[derive(Debug, Clone, Copy)]
pub enum NetworkMode {
    WireGuard,
    Local,
    Unknown,
}

impl NetworkMode {
    pub fn as_str(&self) -> &'static str {
        match self {
            NetworkMode::WireGuard => "WireGuard P2P",
            NetworkMode::Local => "Local",
            NetworkMode::Unknown => "Unknown",
        }
    }
}

/// Detect available clusters
pub fn detect_clusters() -> Vec<ClusterInfo> {
    // Detect each cluster backend (Ray, Dask, Spark).
    vec![detect_ray(), detect_dask(), detect_spark()]
}

fn detect_ray() -> ClusterInfo {
    let default_uri = "ray://127.0.0.1:10001";

    let mut available = false;
    let mut version = None;
    let mut nodes = None;

    // Cluster status: the payload is `{result: <bool>, data: {clusterStatus: …}}`.
    // Active nodes live in `data.clusterStatus.autoscalerReport.activeNodes`,
    // a map of {nodeId: count} — sum the counts. (The old code indexed
    // `json["result"]["data"]`, but `result` is a bool, so nodes never resolved.)
    if let Ok(resp) = ureq::get("http://127.0.0.1:8265/api/cluster_status")
        .config()
        .timeout_global(Some(Duration::from_secs(2)))
        .build()
        .call()
    {
        if let Ok(body) = resp.into_body().read_to_string() {
            if let Ok(json) = serde_json::from_str::<serde_json::Value>(&body) {
                available = true;
                if let Some(active) =
                    json["data"]["clusterStatus"]["autoscalerReport"]["activeNodes"].as_object()
                {
                    let n: u64 = active.values().filter_map(|v| v.as_u64()).sum();
                    nodes = Some(n as u32);
                }
            }
        }
    }

    // Real version from the dashboard's version endpoint, falling back to "2.x".
    if available {
        version = ureq::get("http://127.0.0.1:8265/api/version")
            .config()
            .timeout_global(Some(Duration::from_secs(2)))
            .build()
            .call()
            .ok()
            .and_then(|r| r.into_body().read_to_string().ok())
            .and_then(|b| serde_json::from_str::<serde_json::Value>(&b).ok())
            .and_then(|j| j["ray_version"].as_str().map(|s| s.to_string()))
            .or_else(|| Some("2.x".to_string()));
    }

    ClusterInfo {
        name: "Ray",
        uri: default_uri.to_string(),
        available,
        version,
        nodes,
    }
}

fn detect_dask() -> ClusterInfo {
    let default_uri = "dask://127.0.0.1:8786";

    // The scheduler exposes a JSON identity with the live worker count (and,
    // on newer dask, a version) — more useful than the HTML workers page.
    let mut available = false;
    let mut version = None;
    let mut nodes = None;

    if let Ok(resp) = ureq::get("http://127.0.0.1:8787/json/identity.json")
        .config()
        .timeout_global(Some(Duration::from_secs(2)))
        .build()
        .call()
    {
        if let Ok(body) = resp.into_body().read_to_string() {
            if let Ok(json) = serde_json::from_str::<serde_json::Value>(&body) {
                if json["type"].as_str() == Some("Scheduler") {
                    available = true;
                    nodes = json["n_workers"].as_u64().map(|n| n as u32);
                    version = json["version"]
                        .as_str()
                        .map(|s| s.to_string())
                        .or_else(|| Some("distributed".to_string()));
                }
            }
        }
    }

    ClusterInfo {
        name: "Dask",
        uri: default_uri.to_string(),
        available,
        version,
        nodes,
    }
}

fn detect_spark() -> ClusterInfo {
    let default_uri = "spark://127.0.0.1:7077";

    // Liveness is the Spark master RPC port — that's what `spark://…:7077`
    // actually is. The master *web UI* port varies by deployment (Spark's
    // default is 8080, but it's moved when 8080 is already taken — e.g. the
    // zakuro node puts the s6 dashboard on 8080 and Spark's UI on 8082), so we
    // must not gate availability on a hardcoded UI port. We only consult the UI
    // to enrich the version / alive-worker count, trying the known ports.
    let available = check_port("127.0.0.1", 7077);

    let mut version = None;
    let mut nodes = None;
    if available {
        for ui_port in [8080u16, 8082] {
            if let Ok(resp) = ureq::get(&format!("http://127.0.0.1:{}/json/", ui_port))
                .config()
                .timeout_global(Some(Duration::from_secs(2)))
                .build()
                .call()
            {
                if let Ok(body) = resp.into_body().read_to_string() {
                    if let Ok(json) = serde_json::from_str::<serde_json::Value>(&body) {
                        nodes = json["aliveworkers"].as_u64().map(|n| n as u32);
                        version = Some("3.x".to_string());
                        break;
                    }
                }
            }
        }
    }

    ClusterInfo {
        name: "Spark",
        uri: default_uri.to_string(),
        available,
        version,
        nodes,
    }
}

fn check_port(host: &str, port: u16) -> bool {
    let addr: std::net::SocketAddr = match format!("{}:{}", host, port).parse() {
        Ok(a) => a,
        Err(_) => return false,
    };
    TcpStream::connect_timeout(&addr, Duration::from_secs(1)).is_ok()
}

/// Get network information
pub fn get_network_info() -> NetworkInfo {
    let hostname = hostname::get()
        .map(|h| h.to_string_lossy().to_string())
        .unwrap_or_else(|_| "unknown".to_string());

    let local_ip = get_local_ip();
    let wireguard_ip = get_wireguard_ip();

    let mode = if wireguard_ip.is_some() {
        NetworkMode::WireGuard
    } else if local_ip.is_some() {
        NetworkMode::Local
    } else {
        NetworkMode::Unknown
    };

    NetworkInfo {
        local_ip,
        wireguard_ip,
        hostname,
        mode,
    }
}

fn get_local_ip() -> Option<String> {
    // Try to get the default interface IP
    if let Ok(output) = std::process::Command::new("hostname").arg("-I").output() {
        if output.status.success() {
            let ips = String::from_utf8_lossy(&output.stdout);
            return ips.split_whitespace().next().map(|s| s.to_string());
        }
    }

    // Fallback: try to bind and check
    if let Ok(socket) = std::net::UdpSocket::bind("0.0.0.0:0") {
        if socket.connect("8.8.8.8:80").is_ok() {
            if let Ok(addr) = socket.local_addr() {
                return Some(addr.ip().to_string());
            }
        }
    }

    None
}

/// This host's address on the WireGuard mesh.
///
/// Reads the interface directly rather than asking a daemon: WireGuard is a
/// kernel interface with no control process to interrogate. `zakuro0` is the
/// name `zc vpn` gives it; a plain `wg0` is accepted too.
fn get_wireguard_ip() -> Option<String> {
    for iface in ["zakuro0", "wg0"] {
        let Ok(output) = std::process::Command::new("ip")
            .args(["addr", "show", iface])
            .output()
        else {
            continue;
        };
        if !output.status.success() {
            continue;
        }
        let output_str = String::from_utf8_lossy(&output.stdout);
        for line in output_str.lines() {
            if line.contains("inet ") && !line.contains("inet6") {
                if let Some(inet_part) = line.split("inet ").nth(1) {
                    if let Some(ip) = inet_part.split('/').next() {
                        return Some(ip.trim().to_string());
                    }
                }
            }
        }
    }

    None
}

/// Print system information
pub fn print_info() {
    println!();
    println!(
        "  {}",
        "╔═══════════════════════════════════════════╗".cyan()
    );
    println!(
        "  {}          {}              {}",
        "║".cyan(),
        "Zakuro System Info".bold().white(),
        "║".cyan()
    );
    println!(
        "  {}",
        "╚═══════════════════════════════════════════╝".cyan()
    );
    println!();

    // Network info
    let network = get_network_info();
    println!("  {}", "Network".bold());
    println!("  {}", "─".repeat(50));
    println!("    Hostname:      {}", network.hostname);
    println!(
        "    Mode:          {}",
        match network.mode {
            NetworkMode::WireGuard => network.mode.as_str().green(),
            NetworkMode::Local => network.mode.as_str().yellow(),
            NetworkMode::Unknown => network.mode.as_str().red(),
        }
    );
    if let Some(ip) = &network.local_ip {
        println!("    Local IP:      {}", ip);
    }
    if let Some(ip) = &network.wireguard_ip {
        println!("    WireGuard IP:  {}", ip.cyan());
    }
    println!();

    // Cluster detection
    let clusters = detect_clusters();
    println!("  {}", "Compute Clusters".bold());
    println!("  {}", "─".repeat(50));

    for cluster in &clusters {
        let status = if cluster.available {
            "●".green()
        } else {
            "○".red()
        };

        let version_str = cluster.version.as_deref().unwrap_or("-");
        let nodes_str = cluster
            .nodes
            .map(|n| format!("{} {}", n, if n == 1 { "node" } else { "nodes" }))
            .unwrap_or("-".to_string());

        println!(
            "    {} {:8} {:20} {} {}",
            status,
            cluster.name,
            cluster.uri.dimmed(),
            version_str,
            if cluster.available {
                nodes_str
            } else {
                "not running".dimmed().to_string()
            }
        );
    }
    println!();

    // Environment
    println!("  {}", "Configuration".bold());
    println!("  {}", "─".repeat(50));

    // Show only essential environment variables
    let zakuro_auth = std::env::var("ZAKURO_API_KEY").ok();
    let api_url = crate::credentials::default_api_url();

    println!("    API URL:           {}", api_url.cyan());
    println!(
        "    ZAKURO_API_KEY:       {}",
        if zakuro_auth.is_some() {
            "✓ set".green()
        } else {
            "✗ not set".red()
        }
    );
    println!();

    // Show broker status
    println!("  {}", "Services".bold());
    println!("  {}", "─".repeat(50));

    let services = [
        // hub, not `my`: my.zakuro-ai.com is NXDOMAIN, so this row reported a
        // reachability it could never have.
        ("Production Broker", "hub.zakuro-ai.com", 443_u16, true),
        ("Local Broker", "127.0.0.1", 9000, false),
        ("Local Worker", "127.0.0.1", 3960, false),
    ];

    for (name, host, port, is_https) in services {
        let available = if is_https {
            true
        } else {
            check_port(host, port)
        };
        let status = if available {
            "●".green()
        } else {
            "○".dimmed()
        };
        let port_display = if is_https {
            "https".to_string()
        } else {
            format!(":{}", port)
        };
        println!(
            "    {} {:20} {}{}",
            status,
            name,
            host.dimmed(),
            port_display.dimmed()
        );
    }
    println!();

    // Detect and show mesh nodes (ports 9001–9009)
    let mesh_ports: Vec<u16> = (9001..=9009)
        .filter(|&p| check_port("127.0.0.1", p))
        .collect();

    if !mesh_ports.is_empty() {
        println!("  {}", "Mesh Nodes".bold());
        println!("  {}", "─".repeat(50));

        for port in mesh_ports {
            let url = format!("http://127.0.0.1:{}/health", port);
            match ureq::get(&url)
                .config()
                .timeout_global(Some(Duration::from_millis(500)))
                .build()
                .call()
            {
                Ok(resp) => {
                    if let Ok(body) = resp.into_body().read_to_string() {
                        if let Ok(v) = serde_json::from_str::<serde_json::Value>(&body) {
                            let node_name = v["node_name"].as_str().unwrap_or("unknown");
                            let ts_ip = v["wireguard_ip"].as_str();
                            let ts_connected = v["wireguard_connected"].as_bool().unwrap_or(false);

                            let ts_status = if ts_connected {
                                format!("WireGuard {}", ts_ip.unwrap_or(""))
                                    .green()
                                    .to_string()
                            } else {
                                "no WireGuard".red().to_string()
                            };

                            println!(
                                "    {} {:20} :{} {}",
                                "●".green(),
                                node_name,
                                port,
                                ts_status
                            );
                            continue;
                        }
                    }
                    println!("    {} :{}", "●".green(), port);
                }
                Err(_) => {
                    println!("    {} :{}", "○".dimmed(), port);
                }
            }
        }
        println!();
    }
}

#[cfg(test)]
mod panic_fix_tests {
    use super::check_port;

    #[test]
    fn check_port_bad_host_returns_false_not_panic() {
        // A hostname (non-IP) cannot be parsed into a SocketAddr — must
        // return false rather than panic at the parse step.
        assert!(!check_port("not-an-ip-host", 9000));
        assert!(!check_port("", 9000));
    }

    #[test]
    fn check_port_unreachable_ip_returns_false() {
        // Valid IP, almost certainly nothing listening — false, no panic.
        assert!(!check_port("127.0.0.1", 1));
    }
}