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{ pkgs, lib, ... }:
let
  token = "1234";
  dummyFile = pkgs.writeTextFile {
    name = "secrets";
    text = "dummy=value";
  };
  secretFile = pkgs.writeTextFile {
    name = "secrets";
    text = "token=${token}";
  };
  portRange = 6003;
in
{
  name = "frp";
  meta.maintainers = with lib.maintainers; [
    zaldnoay
    epireyn
  ];
  nodes = {
    frps = {
      networking = {
        useNetworkd = true;
        useDHCP = false;
        firewall.enable = false;
      };

      systemd.network.networks."01-eth1" = {
        name = "eth1";
        networkConfig.Address = "10.0.0.1/24";
      };

      services.frp.instances.server = {
        enable = true;
        role = "server";
        environmentFiles = [
          (builtins.toPath dummyFile)
          (builtins.toPath secretFile)
        ];
        settings = {
          bindPort = 7000;
          vhostHTTPPort = 80;
          auth.method = "token";
          auth.token = "{{ .Envs.token }}";
        };
      };
    };

    frpc = {
      networking = {
        useNetworkd = true;
        useDHCP = false;
      };

      systemd.network.networks."01-eth1" = {
        name = "eth1";
        networkConfig.Address = "10.0.0.2/24";
      };

      services.httpd = {
        enable = true;
        adminAddr = "admin@example.com";
        virtualHosts =
          let
            testdir = pkgs.writeTextDir "web/index.php" "<?php phpinfo();";
          in
          {
            "test-appication" = {
              documentRoot = "${testdir}/web";
              locations."/" = {
                index = "index.php index.html";
              };
            };
            "test-range" = {
              documentRoot = "${testdir}/web";
              listen = [
                { port = portRange; }
              ];
              locations."/" = {
                index = "index.php index.html";
              };
            };
          };
        phpPackage = pkgs.php84;
        enablePHP = true;
      };

      services.frp.instances.client = {
        enable = true;
        role = "client";
        settings = {
          serverAddr = "10.0.0.1";
          serverPort = 7000;
          auth.method = "token";
          auth.token = token;
          proxies = [
            {
              name = "web";
              type = "http";
              localPort = 80;
              customDomains = [ "10.0.0.1" ];
            }
          ];
        };
        extraConfig = ''
          {{- range $_, $v := parseNumberRangePair "6000-6006,6007" "6000-6006,6007" }}
          [[proxies]]
          name = "tcp-{{ $v.First }}"
          type = "tcp"
          localPort = {{ $v.First }}
          remotePort = {{ $v.Second }}
          {{- end }}
        '';
      };
    };
  };

  testScript = ''
    start_all()
    frps.wait_for_unit("frp-server.service")
    frps.wait_for_open_port(80)
    frpc.wait_for_unit("frp-client.service")

    # Test config written in Nix
    response = frpc.succeed("curl -fvvv -s http://127.0.0.1/")
    assert "PHP Version ${pkgs.php84.version}" in response, "PHP version not detected"
    response = frpc.succeed("curl -fvvv -s http://10.0.0.1/")
    assert "PHP Version ${pkgs.php84.version}" in response, "PHP version not detected"

    # Test `extraConfig` option with port range
    response = frpc.succeed("curl -fvvv -s http://127.0.0.1:${toString portRange}/")
    assert "PHP Version ${pkgs.php84.version}" in response, "PHP version not detected"
    response = frpc.succeed("curl -fvvv -s http://10.0.0.1:${toString portRange}/")
    assert "PHP Version ${pkgs.php84.version}" in response, "PHP version not detected"
  '';
}