cm-dashboard/agent/src/collectors/network.rs

use async_trait::async_trait;
use cm_dashboard_shared::{AgentData, NetworkInterfaceData, Status};
use std::process::Command;
use tracing::debug;

use super::{Collector, CollectorError};
use crate::config::NetworkConfig;

/// Network interface collector with physical/virtual classification and link status
pub struct NetworkCollector {
    _config: NetworkConfig,
}

impl NetworkCollector {
    pub fn new(config: NetworkConfig) -> Self {
        Self { _config: config }
    }

    /// Check if interface is physical (not virtual)
    fn is_physical_interface(name: &str) -> bool {
        // Physical interface patterns
        matches!(
            &name[..],
            s if s.starts_with("eth")
                || s.starts_with("ens")
                || s.starts_with("enp")
                || s.starts_with("wlan")
                || s.starts_with("wlp")
                || s.starts_with("eno")
                || s.starts_with("enx")
        )
    }

    /// Get link status for an interface
    fn get_link_status(interface: &str) -> Status {
        let operstate_path = format!("/sys/class/net/{}/operstate", interface);

        match std::fs::read_to_string(&operstate_path) {
            Ok(state) => {
                let state = state.trim();
                match state {
                    "up" => Status::Ok,
                    "down" => Status::Inactive,
                    "unknown" => Status::Warning,
                    _ => Status::Unknown,
                }
            }
            Err(_) => Status::Unknown,
        }
    }

    /// Get the primary physical interface (the one with default route)
    fn get_primary_physical_interface() -> Option<String> {
        match Command::new("ip").args(["route", "show", "default"]).output() {
            Ok(output) if output.status.success() => {
                let output_str = String::from_utf8_lossy(&output.stdout);
                // Parse: "default via 192.168.1.1 dev eno1 ..."
                for line in output_str.lines() {
                    if line.starts_with("default") {
                        if let Some(dev_pos) = line.find(" dev ") {
                            let after_dev = &line[dev_pos + 5..];
                            if let Some(space_pos) = after_dev.find(' ') {
                                let interface = &after_dev[..space_pos];
                                // Only return if it's a physical interface
                                if Self::is_physical_interface(interface) {
                                    return Some(interface.to_string());
                                }
                            } else {
                                // No space after interface name (end of line)
                                let interface = after_dev.trim();
                                if Self::is_physical_interface(interface) {
                                    return Some(interface.to_string());
                                }
                            }
                        }
                    }
                }
                None
            }
            _ => None,
        }
    }

    /// Parse VLAN configuration from /proc/net/vlan/config
    /// Returns a map of interface name -> VLAN ID
    fn parse_vlan_config() -> std::collections::HashMap<String, u16> {
        let mut vlan_map = std::collections::HashMap::new();

        if let Ok(contents) = std::fs::read_to_string("/proc/net/vlan/config") {
            for line in contents.lines().skip(2) {  // Skip header lines
                let parts: Vec<&str> = line.split('|').collect();
                if parts.len() >= 2 {
                    let interface_name = parts[0].trim();
                    let vlan_id_str = parts[1].trim();

                    if let Ok(vlan_id) = vlan_id_str.parse::<u16>() {
                        vlan_map.insert(interface_name.to_string(), vlan_id);
                    }
                }
            }
        }

        vlan_map
    }

    /// Collect network interfaces using ip command
    async fn collect_interfaces(&self) -> Vec<NetworkInterfaceData> {
        let mut interfaces = Vec::new();

        // Parse VLAN configuration
        let vlan_map = Self::parse_vlan_config();

        match Command::new("ip").args(["-j", "addr"]).output() {
            Ok(output) if output.status.success() => {
                let json_str = String::from_utf8_lossy(&output.stdout);

                if let Ok(json_data) = serde_json::from_str::<serde_json::Value>(&json_str) {
                    if let Some(ifaces) = json_data.as_array() {
                        for iface in ifaces {
                            let name = iface["ifname"].as_str().unwrap_or("").to_string();

                            // Skip loopback, empty names, and ifb* interfaces
                            if name.is_empty() || name == "lo" || name.starts_with("ifb") {
                                continue;
                            }

                            // Parse parent interface from @parent notation (e.g., lan@enp0s31f6)
                            let (interface_name, parent_interface) = if let Some(at_pos) = name.find('@') {
                                let (child, parent) = name.split_at(at_pos);
                                (child.to_string(), Some(parent[1..].to_string()))
                            } else {
                                (name.clone(), None)
                            };

                            let mut ipv4_addresses = Vec::new();
                            let mut ipv6_addresses = Vec::new();

                            // Extract IP addresses
                            if let Some(addr_info) = iface["addr_info"].as_array() {
                                for addr in addr_info {
                                    if let Some(family) = addr["family"].as_str() {
                                        if let Some(local) = addr["local"].as_str() {
                                            match family {
                                                "inet" => ipv4_addresses.push(local.to_string()),
                                                "inet6" => {
                                                    // Skip link-local IPv6 addresses (fe80::)
                                                    if !local.starts_with("fe80:") {
                                                        ipv6_addresses.push(local.to_string());
                                                    }
                                                }
                                                _ => {}
                                            }
                                        }
                                    }
                                }
                            }

                            // Determine if physical and get status
                            let is_physical = Self::is_physical_interface(&interface_name);

                            // Only filter out virtual interfaces without IPs
                            // Physical interfaces should always be shown even if down/no IPs
                            if !is_physical && ipv4_addresses.is_empty() && ipv6_addresses.is_empty() {
                                continue;
                            }

                            let link_status = if is_physical {
                                Self::get_link_status(&name)
                            } else {
                                Status::Unknown  // Virtual interfaces don't have meaningful link status
                            };

                            // Look up VLAN ID from the map (use original name before @ parsing)
                            let vlan_id = vlan_map.get(&name).copied();

                            interfaces.push(NetworkInterfaceData {
                                name: interface_name,
                                ipv4_addresses,
                                ipv6_addresses,
                                is_physical,
                                link_status,
                                parent_interface,
                                vlan_id,
                            });
                        }
                    }
                }
            }
            Err(e) => {
                debug!("Failed to execute ip command: {}", e);
            }
            Ok(output) => {
                debug!("ip command failed with status: {}", output.status);
            }
        }

        // Assign primary physical interface as parent to virtual interfaces without explicit parent
        let primary_interface = Self::get_primary_physical_interface();
        if let Some(primary) = primary_interface {
            for interface in interfaces.iter_mut() {
                // Only assign parent to virtual interfaces that don't already have one
                if !interface.is_physical && interface.parent_interface.is_none() {
                    interface.parent_interface = Some(primary.clone());
                }
            }
        }

        interfaces
    }
}

#[async_trait]
impl Collector for NetworkCollector {
    async fn collect_structured(&self, agent_data: &mut AgentData) -> Result<(), CollectorError> {
        debug!("Collecting network interface data");

        // Collect all network interfaces
        let interfaces = self.collect_interfaces().await;

        agent_data.system.network.interfaces = interfaces;

        Ok(())
    }
}