use crate::exporter_error::ExporterError;
use crate::wireguard_config::PeerEntryHashMap;
use log::{debug, trace};
use prometheus_exporter_base::{MetricType, PrometheusMetric};
use regex::Regex;
use std::collections::HashMap;
use std::convert::TryFrom;
use std::net::SocketAddr;

const EMPTY: &str = "(none)";

#[derive(Default, Debug, Clone)]
pub(crate) struct LocalEndpoint {
    pub public_key: String,
    pub private_key: String,
    pub local_port: u16,
    pub persistent_keepalive: bool,
}

#[derive(Debug, Clone)]
pub(crate) struct RemoteEndpoint {
    pub public_key: String,
    pub remote_ip: Option<String>,
    pub remote_port: Option<u16>,
    pub allowed_ips: String,
    pub latest_handshake: u64,
    pub sent_bytes: u128,
    pub received_bytes: u128,
    pub persistent_keepalive: bool,
}

#[derive(Debug, Clone)]
pub(crate) enum Endpoint {
    Local(LocalEndpoint),
    Remote(RemoteEndpoint),
}

fn to_option_string(s: &str) -> Option<String> {
    if s == EMPTY {
        None
    } else {
        Some(s.to_owned())
    }
}

fn to_bool(s: &str) -> bool {
    s != "off"
}

#[derive(Debug, Clone)]
pub(crate) struct WireGuard {
    pub interfaces: HashMap<String, Vec<Endpoint>>,
}

impl TryFrom<&str> for WireGuard {
    type Error = ExporterError;

    fn try_from(input: &str) -> Result<Self, Self::Error> {
        debug!("WireGuard::try_from({}) called", input);
        let mut wg = WireGuard {
            interfaces: HashMap::new(),
        };

        for line in input.lines() {
            let v: Vec<&str> = line.split('\t').filter(|s| !s.is_empty()).collect();
            debug!("WireGuard::try_from v == {:?}", v);

            let endpoint = if v.len() == 5 {
                // this is the local interface
                Endpoint::Local(LocalEndpoint {
                    public_key: v[1].to_owned(),
                    private_key: v[2].to_owned(),
                    local_port: v[3].parse::<u16>().unwrap(),
                    persistent_keepalive: to_bool(v[4]),
                })
            } else {
                // remote endpoint
                let public_key = v[1].to_owned();

                let (remote_ip, remote_port) = if let Some(ip_and_port) = to_option_string(v[3]) {
                    // this workaround fixes issue #10 (see
                    // https://github.com/MindFlavor/prometheus_wireguard_exporter/issues/10).
                    // Whenever it will be fixed upstream this code will be replaced with a
                    // simple
                    // let addr: SocketAddr = ip_and_port.parse::<SocketAddr>().unwrap();
                    let re =
                        Regex::new(r"^\[(?P<ip>[A-Fa-f0-9:]+)%(.*)\]:(?P<port>[0-9]+)$").unwrap();
                    let addr: SocketAddr = re
                        .replace_all(&ip_and_port, "[$ip]:$port")
                        .parse::<SocketAddr>()
                        .unwrap();

                    (Some(addr.ip().to_string()), Some(addr.port()))
                } else {
                    (None, None)
                };

                let allowed_ips = v[4].to_owned();

                Endpoint::Remote(RemoteEndpoint {
                    public_key,
                    remote_ip,
                    remote_port,
                    allowed_ips,
                    latest_handshake: v[5].parse::<u64>()?,
                    received_bytes: v[6].parse::<u128>().unwrap(),
                    sent_bytes: v[7].parse::<u128>().unwrap(),
                    persistent_keepalive: to_bool(v[8]),
                })
            };

            trace!("WireGuard::try_from endpoint == {:?}", endpoint);

            if let Some(endpoints) = wg.interfaces.get_mut(v[0]) {
                endpoints.push(endpoint);
            } else {
                let mut new_vec = Vec::new();
                new_vec.push(endpoint);
                wg.interfaces.insert(v[0].to_owned(), new_vec);
            }
        }

        trace!("{:?}", wg);
        Ok(wg)
    }
}

impl WireGuard {
    pub fn merge(&mut self, merge_from: &WireGuard) {
        for (interface_name, endpoints_to_merge) in merge_from.interfaces.iter() {
            if let Some(endpoints) = self.interfaces.get_mut(&interface_name as &str) {
                endpoints.extend_from_slice(&endpoints_to_merge);
            } else {
                let mut new_vec = Vec::new();
                new_vec.extend_from_slice(&endpoints_to_merge);
                self.interfaces.insert(interface_name.to_owned(), new_vec);
            }
        }
    }

    pub(crate) fn render_with_names(
        &self,
        pehm: Option<&PeerEntryHashMap>,
        split_allowed_ips: bool,
        export_remote_ip_and_port: bool,
    ) -> String {
        debug!("WireGuard::render_with_names(self == {:?}, pehm == {:?}, split_allowed_ips == {:?}, export_remote_ip_and_port == {:?} called", self, pehm, split_allowed_ips,export_remote_ip_and_port);

        // these are the exported counters
        let pc_sent_bytes_total = PrometheusMetric::new(
            "wireguard_sent_bytes_total",
            MetricType::Counter,
            "Bytes sent to the peer",
        );
        let pc_received_bytes_total = PrometheusMetric::new(
            "wireguard_received_bytes_total",
            MetricType::Counter,
            "Bytes received from the peer",
        );
        let pc_latest_handshake = PrometheusMetric::new(
            "wireguard_latest_handshake_seconds",
            MetricType::Gauge,
            "Seconds from the last handshake",
        );

        // these 3 vectors will hold the intermediate
        // values. We use the vector in order to traverse
        // the interfaces slice only once: since we need to output
        // the values grouped by counter we populate the vectors here
        // and then reorder during the final string creation phase.
        let mut s_sent_bytes_total = Vec::new();
        s_sent_bytes_total.push(pc_sent_bytes_total.render_header());

        let mut s_received_bytes_total = Vec::new();
        s_received_bytes_total.push(pc_received_bytes_total.render_header());

        let mut s_latest_handshake = Vec::new();
        s_latest_handshake.push(pc_latest_handshake.render_header());

        // Here we make sure we process the interfaces in the
        // lexicographical order.
        // This is not stricly necessary but it ensures
        // a consistent output between executions (the iter() function
        // of HashMap does not guarantee any ordering).
        // Prometheus does not care about ordering but humans do so
        // we'll sort it beforehand. Being references the cost
        // should be negligible anyway.
        let mut interfaces_sorted: Vec<(&String, &Vec<Endpoint>)> = self
            .interfaces
            .iter()
            .collect::<Vec<(&String, &Vec<Endpoint>)>>();
        interfaces_sorted.sort_by(|a, b| a.0.partial_cmp(b.0).unwrap());

        for (interface, endpoints) in interfaces_sorted.into_iter() {
            for endpoint in endpoints {
                // only show remote endpoints
                if let Endpoint::Remote(ep) = endpoint {
                    debug!("WireGuard::render_with_names ep == {:?}", ep);

                    // we store in attributes_owned the ownership of the values in order to
                    // store in attibutes their references. attributes_owned is onyl
                    // needed for separate ip+subnet
                    let mut attributes_owned: Vec<(String, String)> = Vec::new();
                    let mut attributes: Vec<(&str, &str)> = Vec::new();

                    attributes.push(("interface", interface));
                    attributes.push(("public_key", &ep.public_key));

                    if split_allowed_ips {
                        let v_ip_and_subnet: Vec<(&str, &str)> = ep
                            .allowed_ips
                            .split(',')
                            .map(|ip_and_subnet| {
                                debug!(
                                    "WireGuard::render_with_names ip_and_subnet == {:?}",
                                    ip_and_subnet
                                );
                                let tokens: Vec<&str> = ip_and_subnet.split('/').collect();
                                debug!("WireGuard::render_with_names tokens == {:?}", tokens);
                                let addr = tokens[0];
                                let subnet = tokens[1];
                                (addr, subnet)
                            })
                            .collect();

                        for (idx, (ip, subnet)) in v_ip_and_subnet.iter().enumerate() {
                            attributes_owned
                                .push((format!("allowed_ip_{}", idx), (*ip).to_string()));
                            attributes_owned
                                .push((format!("allowed_subnet_{}", idx), (*subnet).to_string()));
                        }
                        debug!(
                            "WireGuard::render_with_names attributes == {:?}",
                            attributes
                        );
                    } else {
                        attributes.push(("allowed_ips", &ep.allowed_ips));
                    }

                    // let's add the friendly_name attribute if present
                    // and has meaniningful value
                    if let Some(pehm) = pehm {
                        if let Some(ep_friendly_name) = pehm.get(&ep.public_key as &str) {
                            if let Some(ep_friendly_name) = ep_friendly_name.name {
                                attributes.push(("friendly_name", &ep_friendly_name));
                            }
                        }
                    }

                    if export_remote_ip_and_port {
                        if let Some(r_ip) = &ep.remote_ip {
                            attributes.push(("remote_ip", &r_ip));
                        }
                        if let Some(r_port) = &ep.remote_port {
                            attributes_owned.push(("remote_port".to_string(), r_port.to_string()));
                        }
                    }

                    for (label, val) in &attributes_owned {
                        attributes.push((label, val));
                    }

                    s_sent_bytes_total
                        .push(pc_sent_bytes_total.render_sample(Some(&attributes), ep.sent_bytes));
                    s_received_bytes_total.push(
                        pc_received_bytes_total.render_sample(Some(&attributes), ep.received_bytes),
                    );
                    s_latest_handshake.push(
                        pc_latest_handshake.render_sample(Some(&attributes), ep.latest_handshake),
                    );
                }
            }
        }

        // now let's join the results and return it to the caller
        let mut s = String::with_capacity(s_latest_handshake.len() * 64 * 3);
        for item in s_sent_bytes_total {
            s.push_str(&item);
        }
        for item in s_received_bytes_total {
            s.push_str(&item);
        }
        for item in s_latest_handshake {
            s.push_str(&item);
        }

        s
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    const TEXT : &'static str = "wg0\t000q4qAC0ExW/BuGSmVR1nxH9JAXT6g9Wd3oEGy5lA=\t0000u8LWR682knVm350lnuqlCJzw5SNLW9Nf96P+m8=\t51820\toff
wg0\t2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=\t(none)\t37.159.76.245:29159\t10.70.0.2/32,10.70.0.66/32\t1555771458\t10288508\t139524160\toff
wg0\tqnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=\t(none)\t(none)\t10.70.0.3/32\t0\t0\t0\toff
wg0\tL2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=\t(none)\t(none)\t10.70.0.4/32\t0\t0\t0\toff
wg0\tMdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=\t(none)\t(none)\t10.70.0.50/32\t0\t0\t0\toff
wg2\tMdVOIPKt9K2MPj/sO2NlWQbOnFJcL/qX80mmhQwsUlA=\t(none)\t(none)\t10.70.5.50/32\t0\t0\t0\toff
pollo\tYdVOIPKt9K2MPsO2NlWQbOnFJcL/qX80mmhQwsUlA=\t(none)\t(none)\t10.70.70.50/32\t0\t0\t0\toff
wg0\t928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=\t(none)\t5.90.62.106:21741\t10.70.0.80/32\t1555344925\t283012\t6604620\toff
";

    const TEXT_ISSUE_19 : &'static str = "wg0\twJyy0Xcqk76dNQI8bnzaQvrtle5Od+wft1RBK3fC8kc=\tVfjHGauX8OxotDMm2vi3JdwOUTDsFbxCnyInJ/wAXlk=\t51820\toff
wg0\t923V/iAdcz8BcqB0Xo6pDJzARGBJCQ6fWe+peixQyB4=\t(none)\t10.211.123.112:51820\t10.90.0.10/32,10.0.1.0/24\t0\t0\t0\toff
wg0\t9M1fhLa9sIlT39z+SI/0a5H3mNSHYmM+NGA6sirD2nU=\t(none)\t10.211.123.113:51820\t10.90.0.3/32,10.198.171.0/24\t0\t0\t0\toff
wg0\tgnRKXngxSppcYegsg38kEFn5Lmk4NcnRXLcZTtg2A2E=\t(none)\t10.211.123.114:51820\t10.90.0.11/32,10.189.143.0/24\t0\t0\t0\toff
wg0\tYW7NBDEPXuW9GQlFWFzpgrivMxzdR55M8VOTX+E0thw=\t(none)\t10.211.123.115:51820\t10.90.0.12/32,10.0.2.0/24\t0\t0\t0\toff
wg0\teVfg1BH1hcteASE16+TjShxAJNyFLQ9QIcnCaylD/AA=\t(none)\t10.211.123.116:51820\t10.90.0.13/32,10.0.3.0/24\t0\t0\t0\toff
wg0\tlh1h+tWPahB+PAWW62ExHVVrOp9IwdjYwaGnPIXgNwY=\t(none)\t10.211.123.117:51820\t10.90.0.9/32,10.0.4.0/24\t0\t0\t0\toff
wg0\tVQIrk1BiBfbOkkKGPiarEvhA4iPuszIL1lddvvFDvE0=\t(none)\t10.211.123.118:51820\t10.90.0.8/32,10.0.5.0/24\t0\t0\t0\toff
wg0\tSMp58OwCNnwlzu+OdpA8xiNJzOwbl2gdMaD9CSZCC24=\t(none)\t10.211.123.119:51820\t10.90.0.14/32,10.0.6.0/24\t0\t0\t0\toff
wg0\t+0+yMIHVCqyIf4by1gxAjqQ92iKv3bQ/JctNVUEpSlU=\t(none)\t10.211.123.120:51820\t10.90.0.7/32,10.0.7.0/24\t0\t0\t0\toff
wg0\t2StYqQY9tyVkGcO4ykKTiTu6AQp/yIYx8I4hwBLO1jA=\t(none)\t10.211.123.121:51820\t10.90.0.15/32,10.0.8.0/24\t0\t0\t0\toff
wg0\tqa0AMD2puDBBrs8NYQ+skIrIi/Q5NgQRZLEh5p80Mnc=\t(none)\t10.211.123.122:51820\t10.90.0.1/32,10.0.10.0/24\t0\t0\t0\toff
wg0\tYwObmKDK4lfr5F6FHqJhDy9nkUQwbuK8wh4ac2VNSEU=\t(none)\t10.211.123.123:51820\t10.90.0.2/32,10.0.11.0/24\t0\t0\t0\toff
wg0\tq07dm9n1UMLFbG6Dh+BNztCt7jVb9VtpVshQEf580kA=\t(none)\t10.211.123.124:51820\t10.90.0.6/32,10.0.13.0/24\t0\t0\t0\toff
wg0\tyZOoC2t6pBcXvoczuiJqrQ+8CYvJCzcq8aqyp+APaAE=\t(none)\t10.211.123.125:51820\t10.90.0.16/32,10.0.14.0/24\t1574770531\t1232856\t12306832\toff
wg0\tyjeBkrZqUThSSHySFzWCjxAH8cxtiWSI2I8JFD6t1UM=\t(none)\t10.211.123.126:51820\t10.90.0.5/32\t1574770705\t18576788764\t10642564136\toff
wg0\tHtOSi37ALMnSkeAFqeWYZqlBnZqAJERhb5o/i3ZPEFI=\t(none)\t10.211.123.127:51820\t10.90.0.17/32\t1574770783\t62592693520\t1439257868\toff
wg0\tsUsR6xufQQ8Tf0FuyY9tfEeYdhVMeFelr4ZMUrj+B0E=\t(none)\t10.211.123.128:51820\t10.90.0.18/32\t1574770693\t75066288152\t1624251784\toff";

    #[test]
    fn test_parse_issue_19() {
        println!("starting debug");
        let a = WireGuard::try_from(TEXT_ISSUE_19).unwrap();
        assert!(a.interfaces.len() == 1);
        assert!(a.interfaces["wg0"].len() == 18);

        let e1 = match &a.interfaces["wg0"][1] {
            Endpoint::Local(_) => panic!(),
            Endpoint::Remote(re) => re,
        };
        assert_eq!(
            e1.public_key,
            "923V/iAdcz8BcqB0Xo6pDJzARGBJCQ6fWe+peixQyB4="
        );

        assert_eq!(e1.remote_ip, Some("10.211.123.112".to_owned()));
        assert_eq!(e1.allowed_ips, "10.90.0.10/32,10.0.1.0/24".to_owned());

        let e17 = match &a.interfaces["wg0"][17] {
            Endpoint::Local(_) => panic!(),
            Endpoint::Remote(re) => re,
        };
        assert_eq!(
            e17.public_key,
            "sUsR6xufQQ8Tf0FuyY9tfEeYdhVMeFelr4ZMUrj+B0E="
        );

        assert_eq!(e17.remote_ip, Some("10.211.123.128".to_owned()));
        assert_eq!(e17.allowed_ips, "10.90.0.18/32".to_owned());
        assert_eq!(e17.latest_handshake, 1574770693);
        assert_eq!(e17.sent_bytes, 1624251784);
        assert_eq!(e17.received_bytes, 75066288152);

        let pe = PeerEntryHashMap::new();

        let s = a.render_with_names(Some(&pe), true, true);
        println!("{}", s);

        let s_ok = "# HELP wireguard_sent_bytes_total Bytes sent to the peer
# TYPE wireguard_sent_bytes_total counter
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"923V/iAdcz8BcqB0Xo6pDJzARGBJCQ6fWe+peixQyB4=\",remote_ip=\"10.211.123.112\",allowed_ip_0=\"10.90.0.10\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.1.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"9M1fhLa9sIlT39z+SI/0a5H3mNSHYmM+NGA6sirD2nU=\",remote_ip=\"10.211.123.113\",allowed_ip_0=\"10.90.0.3\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.198.171.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"gnRKXngxSppcYegsg38kEFn5Lmk4NcnRXLcZTtg2A2E=\",remote_ip=\"10.211.123.114\",allowed_ip_0=\"10.90.0.11\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.189.143.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"YW7NBDEPXuW9GQlFWFzpgrivMxzdR55M8VOTX+E0thw=\",remote_ip=\"10.211.123.115\",allowed_ip_0=\"10.90.0.12\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.2.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"eVfg1BH1hcteASE16+TjShxAJNyFLQ9QIcnCaylD/AA=\",remote_ip=\"10.211.123.116\",allowed_ip_0=\"10.90.0.13\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.3.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"lh1h+tWPahB+PAWW62ExHVVrOp9IwdjYwaGnPIXgNwY=\",remote_ip=\"10.211.123.117\",allowed_ip_0=\"10.90.0.9\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.4.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"VQIrk1BiBfbOkkKGPiarEvhA4iPuszIL1lddvvFDvE0=\",remote_ip=\"10.211.123.118\",allowed_ip_0=\"10.90.0.8\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.5.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"SMp58OwCNnwlzu+OdpA8xiNJzOwbl2gdMaD9CSZCC24=\",remote_ip=\"10.211.123.119\",allowed_ip_0=\"10.90.0.14\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.6.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"+0+yMIHVCqyIf4by1gxAjqQ92iKv3bQ/JctNVUEpSlU=\",remote_ip=\"10.211.123.120\",allowed_ip_0=\"10.90.0.7\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.7.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"2StYqQY9tyVkGcO4ykKTiTu6AQp/yIYx8I4hwBLO1jA=\",remote_ip=\"10.211.123.121\",allowed_ip_0=\"10.90.0.15\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.8.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"qa0AMD2puDBBrs8NYQ+skIrIi/Q5NgQRZLEh5p80Mnc=\",remote_ip=\"10.211.123.122\",allowed_ip_0=\"10.90.0.1\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.10.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"YwObmKDK4lfr5F6FHqJhDy9nkUQwbuK8wh4ac2VNSEU=\",remote_ip=\"10.211.123.123\",allowed_ip_0=\"10.90.0.2\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.11.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"q07dm9n1UMLFbG6Dh+BNztCt7jVb9VtpVshQEf580kA=\",remote_ip=\"10.211.123.124\",allowed_ip_0=\"10.90.0.6\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.13.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"yZOoC2t6pBcXvoczuiJqrQ+8CYvJCzcq8aqyp+APaAE=\",remote_ip=\"10.211.123.125\",allowed_ip_0=\"10.90.0.16\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.14.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 12306832
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"yjeBkrZqUThSSHySFzWCjxAH8cxtiWSI2I8JFD6t1UM=\",remote_ip=\"10.211.123.126\",allowed_ip_0=\"10.90.0.5\",allowed_subnet_0=\"32\",remote_port=\"51820\"} 10642564136
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"HtOSi37ALMnSkeAFqeWYZqlBnZqAJERhb5o/i3ZPEFI=\",remote_ip=\"10.211.123.127\",allowed_ip_0=\"10.90.0.17\",allowed_subnet_0=\"32\",remote_port=\"51820\"} 1439257868
wireguard_sent_bytes_total{interface=\"wg0\",public_key=\"sUsR6xufQQ8Tf0FuyY9tfEeYdhVMeFelr4ZMUrj+B0E=\",remote_ip=\"10.211.123.128\",allowed_ip_0=\"10.90.0.18\",allowed_subnet_0=\"32\",remote_port=\"51820\"} 1624251784
# HELP wireguard_received_bytes_total Bytes received from the peer
# TYPE wireguard_received_bytes_total counter
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"923V/iAdcz8BcqB0Xo6pDJzARGBJCQ6fWe+peixQyB4=\",remote_ip=\"10.211.123.112\",allowed_ip_0=\"10.90.0.10\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.1.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"9M1fhLa9sIlT39z+SI/0a5H3mNSHYmM+NGA6sirD2nU=\",remote_ip=\"10.211.123.113\",allowed_ip_0=\"10.90.0.3\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.198.171.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"gnRKXngxSppcYegsg38kEFn5Lmk4NcnRXLcZTtg2A2E=\",remote_ip=\"10.211.123.114\",allowed_ip_0=\"10.90.0.11\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.189.143.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"YW7NBDEPXuW9GQlFWFzpgrivMxzdR55M8VOTX+E0thw=\",remote_ip=\"10.211.123.115\",allowed_ip_0=\"10.90.0.12\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.2.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"eVfg1BH1hcteASE16+TjShxAJNyFLQ9QIcnCaylD/AA=\",remote_ip=\"10.211.123.116\",allowed_ip_0=\"10.90.0.13\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.3.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"lh1h+tWPahB+PAWW62ExHVVrOp9IwdjYwaGnPIXgNwY=\",remote_ip=\"10.211.123.117\",allowed_ip_0=\"10.90.0.9\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.4.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"VQIrk1BiBfbOkkKGPiarEvhA4iPuszIL1lddvvFDvE0=\",remote_ip=\"10.211.123.118\",allowed_ip_0=\"10.90.0.8\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.5.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"SMp58OwCNnwlzu+OdpA8xiNJzOwbl2gdMaD9CSZCC24=\",remote_ip=\"10.211.123.119\",allowed_ip_0=\"10.90.0.14\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.6.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"+0+yMIHVCqyIf4by1gxAjqQ92iKv3bQ/JctNVUEpSlU=\",remote_ip=\"10.211.123.120\",allowed_ip_0=\"10.90.0.7\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.7.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"2StYqQY9tyVkGcO4ykKTiTu6AQp/yIYx8I4hwBLO1jA=\",remote_ip=\"10.211.123.121\",allowed_ip_0=\"10.90.0.15\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.8.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"qa0AMD2puDBBrs8NYQ+skIrIi/Q5NgQRZLEh5p80Mnc=\",remote_ip=\"10.211.123.122\",allowed_ip_0=\"10.90.0.1\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.10.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"YwObmKDK4lfr5F6FHqJhDy9nkUQwbuK8wh4ac2VNSEU=\",remote_ip=\"10.211.123.123\",allowed_ip_0=\"10.90.0.2\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.11.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"q07dm9n1UMLFbG6Dh+BNztCt7jVb9VtpVshQEf580kA=\",remote_ip=\"10.211.123.124\",allowed_ip_0=\"10.90.0.6\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.13.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"yZOoC2t6pBcXvoczuiJqrQ+8CYvJCzcq8aqyp+APaAE=\",remote_ip=\"10.211.123.125\",allowed_ip_0=\"10.90.0.16\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.14.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 1232856
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"yjeBkrZqUThSSHySFzWCjxAH8cxtiWSI2I8JFD6t1UM=\",remote_ip=\"10.211.123.126\",allowed_ip_0=\"10.90.0.5\",allowed_subnet_0=\"32\",remote_port=\"51820\"} 18576788764
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"HtOSi37ALMnSkeAFqeWYZqlBnZqAJERhb5o/i3ZPEFI=\",remote_ip=\"10.211.123.127\",allowed_ip_0=\"10.90.0.17\",allowed_subnet_0=\"32\",remote_port=\"51820\"} 62592693520
wireguard_received_bytes_total{interface=\"wg0\",public_key=\"sUsR6xufQQ8Tf0FuyY9tfEeYdhVMeFelr4ZMUrj+B0E=\",remote_ip=\"10.211.123.128\",allowed_ip_0=\"10.90.0.18\",allowed_subnet_0=\"32\",remote_port=\"51820\"} 75066288152
# HELP wireguard_latest_handshake_seconds Seconds from the last handshake
# TYPE wireguard_latest_handshake_seconds gauge
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"923V/iAdcz8BcqB0Xo6pDJzARGBJCQ6fWe+peixQyB4=\",remote_ip=\"10.211.123.112\",allowed_ip_0=\"10.90.0.10\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.1.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"9M1fhLa9sIlT39z+SI/0a5H3mNSHYmM+NGA6sirD2nU=\",remote_ip=\"10.211.123.113\",allowed_ip_0=\"10.90.0.3\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.198.171.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"gnRKXngxSppcYegsg38kEFn5Lmk4NcnRXLcZTtg2A2E=\",remote_ip=\"10.211.123.114\",allowed_ip_0=\"10.90.0.11\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.189.143.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"YW7NBDEPXuW9GQlFWFzpgrivMxzdR55M8VOTX+E0thw=\",remote_ip=\"10.211.123.115\",allowed_ip_0=\"10.90.0.12\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.2.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"eVfg1BH1hcteASE16+TjShxAJNyFLQ9QIcnCaylD/AA=\",remote_ip=\"10.211.123.116\",allowed_ip_0=\"10.90.0.13\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.3.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"lh1h+tWPahB+PAWW62ExHVVrOp9IwdjYwaGnPIXgNwY=\",remote_ip=\"10.211.123.117\",allowed_ip_0=\"10.90.0.9\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.4.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"VQIrk1BiBfbOkkKGPiarEvhA4iPuszIL1lddvvFDvE0=\",remote_ip=\"10.211.123.118\",allowed_ip_0=\"10.90.0.8\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.5.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"SMp58OwCNnwlzu+OdpA8xiNJzOwbl2gdMaD9CSZCC24=\",remote_ip=\"10.211.123.119\",allowed_ip_0=\"10.90.0.14\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.6.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"+0+yMIHVCqyIf4by1gxAjqQ92iKv3bQ/JctNVUEpSlU=\",remote_ip=\"10.211.123.120\",allowed_ip_0=\"10.90.0.7\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.7.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"2StYqQY9tyVkGcO4ykKTiTu6AQp/yIYx8I4hwBLO1jA=\",remote_ip=\"10.211.123.121\",allowed_ip_0=\"10.90.0.15\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.8.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"qa0AMD2puDBBrs8NYQ+skIrIi/Q5NgQRZLEh5p80Mnc=\",remote_ip=\"10.211.123.122\",allowed_ip_0=\"10.90.0.1\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.10.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"YwObmKDK4lfr5F6FHqJhDy9nkUQwbuK8wh4ac2VNSEU=\",remote_ip=\"10.211.123.123\",allowed_ip_0=\"10.90.0.2\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.11.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"q07dm9n1UMLFbG6Dh+BNztCt7jVb9VtpVshQEf580kA=\",remote_ip=\"10.211.123.124\",allowed_ip_0=\"10.90.0.6\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.13.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 0
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"yZOoC2t6pBcXvoczuiJqrQ+8CYvJCzcq8aqyp+APaAE=\",remote_ip=\"10.211.123.125\",allowed_ip_0=\"10.90.0.16\",allowed_subnet_0=\"32\",allowed_ip_1=\"10.0.14.0\",allowed_subnet_1=\"24\",remote_port=\"51820\"} 1574770531
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"yjeBkrZqUThSSHySFzWCjxAH8cxtiWSI2I8JFD6t1UM=\",remote_ip=\"10.211.123.126\",allowed_ip_0=\"10.90.0.5\",allowed_subnet_0=\"32\",remote_port=\"51820\"} 1574770705
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"HtOSi37ALMnSkeAFqeWYZqlBnZqAJERhb5o/i3ZPEFI=\",remote_ip=\"10.211.123.127\",allowed_ip_0=\"10.90.0.17\",allowed_subnet_0=\"32\",remote_port=\"51820\"} 1574770783
wireguard_latest_handshake_seconds{interface=\"wg0\",public_key=\"sUsR6xufQQ8Tf0FuyY9tfEeYdhVMeFelr4ZMUrj+B0E=\",remote_ip=\"10.211.123.128\",allowed_ip_0=\"10.90.0.18\",allowed_subnet_0=\"32\",remote_port=\"51820\"} 1574770693
";
        assert_eq!(s, s_ok);
    }

    #[test]
    fn test_parse() {
        let a = WireGuard::try_from(TEXT).unwrap();
        println!("{:?}", a);
        assert!(a.interfaces.len() == 3);
        assert!(a.interfaces["wg0"].len() == 6);

        let e1 = match &a.interfaces["wg0"][1] {
            Endpoint::Local(_) => panic!(),
            Endpoint::Remote(re) => re,
        };

        assert_eq!(
            e1.public_key,
            "2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk="
        );

        assert_eq!(e1.remote_ip, Some("37.159.76.245".to_owned()));
        assert_eq!(e1.allowed_ips, "10.70.0.2/32,10.70.0.66/32".to_owned());
    }

    #[test]
    fn test_parse_and_serialize() {
        let a = WireGuard::try_from(TEXT).unwrap();
        let s = a.render_with_names(None, false, true);
        println!("{}", s);
    }

    #[test]
    fn test_render_to_prometheus_simple() {
        const REF : &str= "# HELP wireguard_sent_bytes_total Bytes sent to the peer\n# TYPE wireguard_sent_bytes_total counter\nwireguard_sent_bytes_total{interface=\"Pippo\",public_key=\"test\",allowed_ips=\"to_change\",remote_ip=\"remote_ip\",remote_port=\"100\"} 1000\n# HELP wireguard_received_bytes_total Bytes received from the peer\n# TYPE wireguard_received_bytes_total counter\nwireguard_received_bytes_total{interface=\"Pippo\",public_key=\"test\",allowed_ips=\"to_change\",remote_ip=\"remote_ip\",remote_port=\"100\"} 5000\n# HELP wireguard_latest_handshake_seconds Seconds from the last handshake\n# TYPE wireguard_latest_handshake_seconds gauge\nwireguard_latest_handshake_seconds{interface=\"Pippo\",public_key=\"test\",allowed_ips=\"to_change\",remote_ip=\"remote_ip\",remote_port=\"100\"} 500\n";

        let re = Endpoint::Remote(RemoteEndpoint {
            public_key: "test".to_owned(),
            remote_ip: Some("remote_ip".to_owned()),
            remote_port: Some(100),
            allowed_ips: "to_change".to_owned(),
            latest_handshake: 500,
            sent_bytes: 1000,
            received_bytes: 5000,
            persistent_keepalive: false,
        });
        let mut wg = WireGuard {
            interfaces: HashMap::new(),
        };

        let mut v = Vec::new();
        v.push(re);
        wg.interfaces.insert("Pippo".to_owned(), v);

        let prometheus = wg.render_with_names(None, false, true);

        assert_eq!(prometheus, REF);
    }

    #[test]
    fn test_render_to_prometheus_complex() {
        use crate::wireguard_config::PeerEntry;

        const REF :&'static str = "# HELP wireguard_sent_bytes_total Bytes sent to the peer\n# TYPE wireguard_sent_bytes_total counter\nwireguard_sent_bytes_total{interface=\"Pippo\",public_key=\"test\",allowed_ips=\"10.0.0.2/32,fd86:ea04:::4/128\",remote_ip=\"remote_ip\",remote_port=\"100\"} 1000\nwireguard_sent_bytes_total{interface=\"Pippo\",public_key=\"second_test\",allowed_ips=\"10.0.0.4/32,fd86:ea04:::4/128,192.168.0.0/16\",friendly_name=\"this is my friendly name\",remote_ip=\"remote_ip\",remote_port=\"100\"} 14\n# HELP wireguard_received_bytes_total Bytes received from the peer\n# TYPE wireguard_received_bytes_total counter\nwireguard_received_bytes_total{interface=\"Pippo\",public_key=\"test\",allowed_ips=\"10.0.0.2/32,fd86:ea04:::4/128\",remote_ip=\"remote_ip\",remote_port=\"100\"} 5000\nwireguard_received_bytes_total{interface=\"Pippo\",public_key=\"second_test\",allowed_ips=\"10.0.0.4/32,fd86:ea04:::4/128,192.168.0.0/16\",friendly_name=\"this is my friendly name\",remote_ip=\"remote_ip\",remote_port=\"100\"} 1000000000\n# HELP wireguard_latest_handshake_seconds Seconds from the last handshake\n# TYPE wireguard_latest_handshake_seconds gauge\nwireguard_latest_handshake_seconds{interface=\"Pippo\",public_key=\"test\",allowed_ips=\"10.0.0.2/32,fd86:ea04:::4/128\",remote_ip=\"remote_ip\",remote_port=\"100\"} 500\nwireguard_latest_handshake_seconds{interface=\"Pippo\",public_key=\"second_test\",allowed_ips=\"10.0.0.4/32,fd86:ea04:::4/128,192.168.0.0/16\",friendly_name=\"this is my friendly name\",remote_ip=\"remote_ip\",remote_port=\"100\"} 50\n";

        const REF_SPLIT :&'static str = "# HELP wireguard_sent_bytes_total Bytes sent to the peer\n# TYPE wireguard_sent_bytes_total counter\nwireguard_sent_bytes_total{interface=\"Pippo\",public_key=\"test\",remote_ip=\"remote_ip\",allowed_ip_0=\"10.0.0.2\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\",remote_port=\"100\"} 1000\nwireguard_sent_bytes_total{interface=\"Pippo\",public_key=\"second_test\",friendly_name=\"this is my friendly name\",remote_ip=\"remote_ip\",allowed_ip_0=\"10.0.0.4\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\",allowed_ip_2=\"192.168.0.0\",allowed_subnet_2=\"16\",remote_port=\"100\"} 14\n# HELP wireguard_received_bytes_total Bytes received from the peer\n# TYPE wireguard_received_bytes_total counter\nwireguard_received_bytes_total{interface=\"Pippo\",public_key=\"test\",remote_ip=\"remote_ip\",allowed_ip_0=\"10.0.0.2\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\",remote_port=\"100\"} 5000\nwireguard_received_bytes_total{interface=\"Pippo\",public_key=\"second_test\",friendly_name=\"this is my friendly name\",remote_ip=\"remote_ip\",allowed_ip_0=\"10.0.0.4\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\",allowed_ip_2=\"192.168.0.0\",allowed_subnet_2=\"16\",remote_port=\"100\"} 1000000000\n# HELP wireguard_latest_handshake_seconds Seconds from the last handshake\n# TYPE wireguard_latest_handshake_seconds gauge\nwireguard_latest_handshake_seconds{interface=\"Pippo\",public_key=\"test\",remote_ip=\"remote_ip\",allowed_ip_0=\"10.0.0.2\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\",remote_port=\"100\"} 500\nwireguard_latest_handshake_seconds{interface=\"Pippo\",public_key=\"second_test\",friendly_name=\"this is my friendly name\",remote_ip=\"remote_ip\",allowed_ip_0=\"10.0.0.4\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\",allowed_ip_2=\"192.168.0.0\",allowed_subnet_2=\"16\",remote_port=\"100\"} 50\n";

        const REF_SPLIT_NO_REMOTE :&'static str = "# HELP wireguard_sent_bytes_total Bytes sent to the peer\n# TYPE wireguard_sent_bytes_total counter\nwireguard_sent_bytes_total{interface=\"Pippo\",public_key=\"test\",allowed_ip_0=\"10.0.0.2\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\"} 1000\nwireguard_sent_bytes_total{interface=\"Pippo\",public_key=\"second_test\",friendly_name=\"this is my friendly name\",allowed_ip_0=\"10.0.0.4\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\",allowed_ip_2=\"192.168.0.0\",allowed_subnet_2=\"16\"} 14\n# HELP wireguard_received_bytes_total Bytes received from the peer\n# TYPE wireguard_received_bytes_total counter\nwireguard_received_bytes_total{interface=\"Pippo\",public_key=\"test\",allowed_ip_0=\"10.0.0.2\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\"} 5000\nwireguard_received_bytes_total{interface=\"Pippo\",public_key=\"second_test\",friendly_name=\"this is my friendly name\",allowed_ip_0=\"10.0.0.4\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\",allowed_ip_2=\"192.168.0.0\",allowed_subnet_2=\"16\"} 1000000000\n# HELP wireguard_latest_handshake_seconds Seconds from the last handshake\n# TYPE wireguard_latest_handshake_seconds gauge\nwireguard_latest_handshake_seconds{interface=\"Pippo\",public_key=\"test\",allowed_ip_0=\"10.0.0.2\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\"} 500\nwireguard_latest_handshake_seconds{interface=\"Pippo\",public_key=\"second_test\",friendly_name=\"this is my friendly name\",allowed_ip_0=\"10.0.0.4\",allowed_subnet_0=\"32\",allowed_ip_1=\"fd86:ea04:::4\",allowed_subnet_1=\"128\",allowed_ip_2=\"192.168.0.0\",allowed_subnet_2=\"16\"} 50\n";

        let re1 = Endpoint::Remote(RemoteEndpoint {
            public_key: "test".to_owned(),
            remote_ip: Some("remote_ip".to_owned()),
            remote_port: Some(100),
            allowed_ips: "10.0.0.2/32,fd86:ea04:::4/128".to_owned(),
            latest_handshake: 500,
            sent_bytes: 1000,
            received_bytes: 5000,
            persistent_keepalive: false,
        });
        let re2 = Endpoint::Remote(RemoteEndpoint {
            public_key: "second_test".to_owned(),
            remote_ip: Some("remote_ip".to_owned()),
            remote_port: Some(100),
            allowed_ips: "10.0.0.4/32,fd86:ea04:::4/128,192.168.0.0/16".to_owned(),
            latest_handshake: 50,
            sent_bytes: 14,
            received_bytes: 1_000_000_000,
            persistent_keepalive: false,
        });

        let mut wg = WireGuard {
            interfaces: HashMap::new(),
        };

        let mut v = Vec::new();
        v.push(re1);
        v.push(re2);
        wg.interfaces.insert("Pippo".to_owned(), v);

        let mut pehm = PeerEntryHashMap::new();
        let pe = PeerEntry {
            public_key: "second_test",
            allowed_ips: "ignored",
            name: Some("this is my friendly name"),
        };
        pehm.insert(pe.public_key, pe);

        let prometheus = wg.render_with_names(Some(&pehm), false, true);
        assert_eq!(prometheus, REF);

        let prometheus = wg.render_with_names(Some(&pehm), true, true);
        assert_eq!(prometheus, REF_SPLIT);

        let prometheus = wg.render_with_names(Some(&pehm), true, false);
        assert_eq!(prometheus, REF_SPLIT_NO_REMOTE);
    }
}