{ pkgs, serverPkg, clientPkg }:
{
  name = "lightscale-lab-relay-failover";
  nodes = {
    node1 = { ... }: {
      networking.hostName = "node1";
      networking.usePredictableInterfaceNames = false;
      virtualisation.vlans = [ 1 ];
      networking.interfaces.eth1.useDHCP = false;
      networking.interfaces.eth1.ipv4.addresses = [
        { address = "10.0.0.1"; prefixLength = 24; }
      ];
      networking.firewall.enable = false;
      boot.kernelModules = [ "wireguard" ];
      environment.systemPackages = [
        serverPkg
        clientPkg
        pkgs.wireguard-tools
        pkgs.iproute2
        pkgs.iputils
        pkgs.netcat-openbsd
        pkgs.curl
      ];
    };
    node2 = { ... }: {
      networking.hostName = "node2";
      networking.usePredictableInterfaceNames = false;
      virtualisation.vlans = [ 1 ];
      networking.interfaces.eth1.useDHCP = false;
      networking.interfaces.eth1.ipv4.addresses = [
        { address = "10.0.0.2"; prefixLength = 24; }
      ];
      networking.firewall.enable = false;
      boot.kernelModules = [ "wireguard" ];
      environment.systemPackages = [
        pkgs.iproute2
        pkgs.iputils
        pkgs.netcat-openbsd
        pkgs.curl
      ];
    };
    node3 = { ... }: {
      networking.hostName = "node3";
      networking.usePredictableInterfaceNames = false;
      virtualisation.vlans = [ 1 ];
      networking.interfaces.eth1.useDHCP = false;
      networking.interfaces.eth1.ipv4.addresses = [
        { address = "10.0.0.3"; prefixLength = 24; }
      ];
      networking.firewall.enable = false;
      boot.kernelModules = [ "wireguard" ];
      environment.systemPackages = [
        serverPkg
        pkgs.wireguard-tools
        pkgs.iproute2
        pkgs.iputils
        pkgs.netcat-openbsd
        pkgs.curl
      ];
    };
    node4 = { ... }: {
      networking.hostName = "node4";
      networking.usePredictableInterfaceNames = false;
      virtualisation.vlans = [ 1 ];
      networking.interfaces.eth1.useDHCP = false;
      networking.interfaces.eth1.ipv4.addresses = [
        { address = "10.0.0.4"; prefixLength = 24; }
      ];
      networking.firewall.enable = false;
      boot.kernelModules = [ "wireguard" ];
      environment.systemPackages = [
        clientPkg
        pkgs.wireguard-tools
        pkgs.iproute2
        pkgs.iputils
        pkgs.netcat-openbsd
        pkgs.curl
      ];
    };
    node5 = { ... }: {
      networking.hostName = "node5";
      networking.usePredictableInterfaceNames = false;
      virtualisation.vlans = [ 1 ];
      networking.interfaces.eth1.useDHCP = false;
      networking.interfaces.eth1.ipv4.addresses = [
        { address = "10.0.0.5"; prefixLength = 24; }
      ];
      networking.firewall.enable = false;
      boot.kernelModules = [ "wireguard" ];
      environment.systemPackages = [
        clientPkg
        pkgs.wireguard-tools
        pkgs.iproute2
        pkgs.iputils
        pkgs.netcat-openbsd
        pkgs.curl
      ];
    };
  };

  testScript = ''
    start_all()
    node1.wait_for_unit("multi-user.target")
    node2.wait_for_unit("multi-user.target")
    node3.wait_for_unit("multi-user.target")
    node4.wait_for_unit("multi-user.target")
    node5.wait_for_unit("multi-user.target")

    node1.wait_until_succeeds("ip -4 addr show dev eth1 | grep -q '10.0.0.1/24'")
    node2.wait_until_succeeds("ip -4 addr show dev eth1 | grep -q '10.0.0.2/24'")
    node3.wait_until_succeeds("ip -4 addr show dev eth1 | grep -q '10.0.0.3/24'")
    node4.wait_until_succeeds("ip -4 addr show dev eth1 | grep -q '10.0.0.4/24'")
    node5.wait_until_succeeds("ip -4 addr show dev eth1 | grep -q '10.0.0.5/24'")

    node1.succeed("touch /tmp/lightscale-server.log")
    node1.execute("sh -c 'tail -n +1 -f /tmp/lightscale-server.log >/dev/console 2>&1 &'")
    node1.succeed(
        "systemd-run --no-block --unit=lightscale-server --service-type=simple "
        "--property=Restart=on-failure --property=RestartSec=1 "
        "--property=TimeoutStartSec=30 "
        "--property=StandardOutput=append:/tmp/lightscale-server.log "
        "--property=StandardError=append:/tmp/lightscale-server.log "
        "--setenv=RUST_LOG=info -- "
        "lightscale-server --listen 10.0.0.1:8080 --state /tmp/lightscale-state.json "
        "--stream-relay 10.0.0.2:8443,10.0.0.3:8443"
    )
    node1.wait_for_unit("lightscale-server.service")
    node1.wait_for_open_port(8080, addr="10.0.0.1", timeout=120)

    node3.succeed("touch /tmp/lightscale-relay.log")
    node3.execute("sh -c 'tail -n +1 -f /tmp/lightscale-relay.log >/dev/console 2>&1 &'")
    node3.succeed(
        "systemd-run --no-block --unit=lightscale-relay --service-type=simple "
        "--property=Restart=on-failure --property=RestartSec=1 "
        "--property=TimeoutStartSec=30 "
        "--property=StandardOutput=append:/tmp/lightscale-relay.log "
        "--property=StandardError=append:/tmp/lightscale-relay.log "
        "--setenv=RUST_LOG=info -- "
        "lightscale-server --listen 10.0.0.3:8082 --state /tmp/lightscale-relay.json "
        "--stream-relay-listen 10.0.0.3:8443"
    )
    node3.wait_for_unit("lightscale-relay.service")
    node3.wait_for_open_port(8443, addr="10.0.0.3", timeout=120)

    import json

    net = json.loads(node1.succeed(
        "curl -sSf -X POST http://10.0.0.1:8080/v1/networks "
        "-H 'content-type: application/json' "
        "-d '{\"name\":\"lab\",\"bootstrap_token_ttl_seconds\":600," \
        "\"bootstrap_token_uses\":10,\"bootstrap_token_tags\":[\"lab\"]}'"
    ))
    token = net["bootstrap_token"]["token"]

    def enroll(node, name, ip, state_dir):
        node.succeed(
            "lightscale-client --profile test --config /tmp/ls-config.json "
            "init http://10.0.0.1:8080"
        )
        node.succeed(
            f"lightscale-client --profile test --config /tmp/ls-config.json "
            f"--state-dir {state_dir} register --node-name {name} -- {token}"
        )
        node.succeed(
            f"lightscale-client --profile test --config /tmp/ls-config.json "
            f"--state-dir {state_dir} heartbeat --endpoint {ip}:51820"
        )

    def start_agent(node, state_dir, endpoint):
        node.succeed("touch /tmp/lightscale-agent.log")
        cmd = (
            "lightscale-client --profile test --config /tmp/ls-config.json "
            f"--state-dir {state_dir} agent --listen-port 51820 "
            "--heartbeat-interval 5 --longpoll-timeout 5 "
            f"--endpoint {endpoint} --stream-relay"
        )
        node.succeed(
            "systemd-run --no-block --unit=lightscale-agent --service-type=simple "
            "--property=Restart=on-failure --property=RestartSec=1 "
            "--property=TimeoutStartSec=30 "
            "--property=StandardOutput=append:/tmp/lightscale-agent.log "
            "--property=StandardError=append:/tmp/lightscale-agent.log -- "
            + cmd
        )
        node.wait_for_unit("lightscale-agent.service")
        node.wait_until_succeeds("ip link show ls-test", timeout=60)

    enroll(node4, "node4", "10.0.0.4", "/tmp/ls-state-4")
    enroll(node5, "node5", "10.0.0.5", "/tmp/ls-state-5")
    start_agent(node4, "/tmp/ls-state-4", "203.0.113.4:51820")
    start_agent(node5, "/tmp/ls-state-5", "203.0.113.5:51820")

    data4 = json.loads(node4.succeed("cat /tmp/ls-state-4/state.json"))
    data5 = json.loads(node5.succeed("cat /tmp/ls-state-5/state.json"))
    ip4 = data4["ipv4"]
    ip5 = data5["ipv4"]

    node4.wait_until_succeeds(f"ping -c 3 {ip5}", timeout=180)
    node5.wait_until_succeeds(f"ping -c 3 {ip4}", timeout=180)

    node4.wait_until_succeeds("grep -q 'connected to 10.0.0.3:8443' /tmp/lightscale-agent.log", timeout=60)
    node5.wait_until_succeeds("grep -q 'connected to 10.0.0.3:8443' /tmp/lightscale-agent.log", timeout=60)
  '';
}