{ lib, ... }:

let
  rootPassword = "$y$j9T$p6OI0WN7.rSfZBOijjRdR.$xUOA2MTcB48ac.9Oc5fz8cxwLv1mMqabnn333iOzSA6";
  sysuserPassword = "hello";
  newSysuserPassword = "$y$j9T$p6OI0WN7.rSfZBOijjRdR.$xUOA2MTcB48ac.9Oc5fz8cxwLv1mMqabnn333iOzSA6";
in

{

  name = "activation-sysusers-mutable";

  meta.maintainers = with lib.maintainers; [ nikstur ];

  nodes.machine = { pkgs, ... }: {
    systemd.sysusers.enable = true;
    users.mutableUsers = true;

    # Prerequisites
    system.etc.overlay.enable = true;
    boot.initrd.systemd.enable = true;
    boot.kernelPackages = pkgs.linuxPackages_latest;

    # Override the empty root password set by the test instrumentation
    users.users.root.hashedPasswordFile = lib.mkForce null;
    users.users.root.initialHashedPassword = rootPassword;
    users.users.sysuser = {
      isSystemUser = true;
      group = "wheel";
      home = "/sysuser";
      initialPassword = sysuserPassword;
    };

    specialisation.new-generation.configuration = {
      users.users.new-sysuser = {
        isSystemUser = true;
        group = "wheel";
        home = "/new-sysuser";
        initialHashedPassword = newSysuserPassword;
      };
    };
  };

  testScript = ''
    machine.wait_for_unit("systemd-sysusers.service")

    with subtest("systemd-sysusers.service contains the credentials"):
      sysusers_service = machine.succeed("systemctl cat systemd-sysusers.service")
      print(sysusers_service)
      assert "SetCredential=passwd.plaintext-password.sysuser:${sysuserPassword}" in sysusers_service

    with subtest("Correct mode on the password files"):
      assert machine.succeed("stat -c '%a' /etc/passwd") == "644\n"
      assert machine.succeed("stat -c '%a' /etc/group") == "644\n"
      assert machine.succeed("stat -c '%a' /etc/shadow") == "0\n"
      assert machine.succeed("stat -c '%a' /etc/gshadow") == "0\n"

    with subtest("root user has correct password"):
      print(machine.succeed("getent passwd root"))
      assert "${rootPassword}" in machine.succeed("getent shadow root"), "root user password is not correct"

    with subtest("sysuser user is created"):
      print(machine.succeed("getent passwd sysuser"))
      assert machine.succeed("stat -c '%U' /sysuser") == "sysuser\n"

    with subtest("Manually add new user"):
      machine.succeed("useradd manual-sysuser")


    machine.succeed("/run/current-system/specialisation/new-generation/bin/switch-to-configuration switch")


    with subtest("new-sysuser user is created after switching to new generation"):
      print(machine.succeed("getent passwd new-sysuser"))
      assert machine.succeed("stat -c '%U' /new-sysuser") == "new-sysuser\n"
      assert "${newSysuserPassword}" in machine.succeed("getent shadow new-sysuser"), "new-sysuser user password is not correct"
  '';
}