{ pkgs, runTest }:

let

  inherit (pkgs) lib;

  meta = with lib.maintainers; {
    maintainers = [ oddlama rnhmjoj ];
  };

  runConnectionTest = name: extraConfig: runTest {
    name = "wpa_supplicant-${name}";
    inherit meta;

    nodes.machine = {
      # add a virtual wlan interface
      boot.kernelModules = [ "mac80211_hwsim" ];

      # wireless access point
      services.hostapd = {
        enable = true;
        radios.wlan0 = {
          band = "2g";
          channel = 6;
          countryCode = "US";
          networks = {
            wlan0 = {
              ssid = "nixos-test-sae";
              authentication = {
                mode = "wpa3-sae";
                saePasswords = [ { password = "reproducibility"; } ];
              };
              bssid = "02:00:00:00:00:00";
            };
            wlan0-1 = {
              ssid = "nixos-test-mixed";
              authentication = {
                mode = "wpa3-sae-transition";
                saeAddToMacAllow = true;
                saePasswordsFile = pkgs.writeText "password" "reproducibility";
                wpaPasswordFile = pkgs.writeText "password" "reproducibility";
              };
              bssid = "02:00:00:00:00:01";
            };
            wlan0-2 = {
              ssid = "nixos-test-wpa2";
              authentication = {
                mode = "wpa2-sha256";
                wpaPassword = "reproducibility";
              };
              bssid = "02:00:00:00:00:02";
            };
          };
        };
      };

      # wireless client
      networking.wireless = lib.mkMerge [
        {
          # the override is needed because the wifi is
          # disabled with mkVMOverride in qemu-vm.nix.
          enable = lib.mkOverride 0 true;
          userControlled.enable = true;
          interfaces = [ "wlan1" ];
          fallbackToWPA2 = lib.mkDefault true;

          # secrets
          secretsFile = pkgs.writeText "wpa-secrets" ''
            psk_nixos_test=reproducibility
          '';
        }
        extraConfig
      ];
    };

    testScript = ''
      # save hostapd config file for manual inspection
      machine.wait_for_unit("hostapd.service")
      machine.copy_from_vm("/run/hostapd/wlan0.hostapd.conf")

      with subtest("Daemon can connect to the access point"):
          machine.wait_for_unit("wpa_supplicant-wlan1.service")
          machine.wait_until_succeeds(
            "wpa_cli -i wlan1 status | grep -q wpa_state=COMPLETED"
          )
    '';
  };

in

{
  # Test the basic setup:
  #   - automatic interface discovery
  #   - WPA2 fallbacks
  #   - connecting to the daemon
  basic = runTest {
    name = "wpa_supplicant-basic";
    inherit meta;

    nodes.machine = {
      # add a virtual wlan interface
      boot.kernelModules = [ "mac80211_hwsim" ];

      # wireless client
      networking.wireless = {
        # the override is needed because the wifi is
        # disabled with mkVMOverride in qemu-vm.nix.
        enable = lib.mkOverride 0 true;
        userControlled.enable = true;
        fallbackToWPA2 = true;

        networks = {
          # test WPA2 fallback
          mixed-wpa = {
            psk = "password";
            authProtocols = [ "WPA-PSK" "SAE" ];
          };
          sae-only = {
            psk = "password";
            authProtocols = [ "SAE" ];
          };
        };
      };
    };

    testScript = ''
      with subtest("Daemon is running and accepting connections"):
          machine.wait_for_unit("wpa_supplicant.service")
          status = machine.wait_until_succeeds("wpa_cli status")
          assert "Failed to connect" not in status, \
                 "Failed to connect to the daemon"

      # get the configuration file
      cmdline = machine.succeed("cat /proc/$(pgrep wpa)/cmdline").split('\x00')
      config_file = cmdline[cmdline.index("-c") + 1]

      with subtest("WPA2 fallbacks have been generated"):
          assert int(machine.succeed(f"grep -c sae-only {config_file}")) == 1
          assert int(machine.succeed(f"grep -c mixed-wpa {config_file}")) == 2

      # save file for manual inspection
      machine.copy_from_vm(config_file)
    '';
  };

  # Test configuring the daemon imperatively
  imperative = runTest {
    name = "wpa_supplicant-imperative";
    inherit meta;

    nodes.machine = {
      # add a virtual wlan interface
      boot.kernelModules = [ "mac80211_hwsim" ];

      # wireless client
      networking.wireless = {
        enable = lib.mkOverride 0 true;
        userControlled.enable = true;
        allowAuxiliaryImperativeNetworks = true;
        interfaces = [ "wlan1" ];
      };
    };

    testScript = ''
      with subtest("Daemon is running and accepting connections"):
          machine.wait_for_unit("wpa_supplicant-wlan1.service")
          status = machine.wait_until_succeeds("wpa_cli -i wlan1 status")
          assert "Failed to connect" not in status, \
                 "Failed to connect to the daemon"

      with subtest("Daemon can be configured imperatively"):
          machine.succeed("wpa_cli -i wlan1 add_network")
          machine.succeed("wpa_cli -i wlan1 set_network 0 ssid '\"nixos-test\"'")
          machine.succeed("wpa_cli -i wlan1 set_network 0 psk '\"reproducibility\"'")
          machine.succeed("wpa_cli -i wlan1 save_config")
          machine.succeed("grep -q nixos-test /etc/wpa_supplicant.conf")
    '';
  };

  # Test connecting to a SAE-only hotspot using SAE
  saeOnly = runConnectionTest "sae-only" {
    fallbackToWPA2 = false;
    networks.nixos-test-sae = {
      pskRaw = "ext:psk_nixos_test";
      authProtocols = [ "SAE" ];
    };
  };

  # Test connecting to a mixed SAE/WPA2 hotspot using SAE
  mixedUsingSae = runConnectionTest "mixed-using-sae" {
    fallbackToWPA2 = false;
    networks.nixos-test-mixed = {
      pskRaw = "ext:psk_nixos_test";
      authProtocols = [ "SAE" ];
    };
  };

  # Test connecting to a mixed SAE/WPA2 hotspot using WPA2
  mixedUsingWpa2 = runConnectionTest "mixed-using-wpa2" {
    fallbackToWPA2 = true;
    networks.nixos-test-mixed = {
      pskRaw = "ext:psk_nixos_test";
      authProtocols = [ "WPA-PSK-SHA256" ];
    };
  };

  # Test connecting to a legacy WPA2-only hotspot using WPA2
  legacy = runConnectionTest "legacy" {
    fallbackToWPA2 = true;
    networks.nixos-test-wpa2 = {
      pskRaw = "ext:psk_nixos_test";
      authProtocols = [ "WPA-PSK-SHA256" ];
    };
  };
}