# The generic installer: router-setup is answered on its console (DHCP uplink,
# LAN address, web UI password), builds the router offline and installs it.
# The installed box must come up with those settings, serve the web UI with
# that password, and rebuild to exactly itself.
{ self, pkgs }:
let
  common = import ./common.nix;

  # Only so the test driver can talk to the installed system.
  local = pkgs.writeText "local.nix" ''
    { lib, modulesPath, ... }:
    {
      imports = [ (modulesPath + "/testing/test-instrumentation.nix") ];
      # The instrumentation empties root's password; keep router-setup's.
      users.users.root.hashedPasswordFile = lib.mkForce "/var/lib/router/root-password";
    }
  '';

  sharedDisk = {
    virtualisation.diskImage = "./target.qcow2";
    virtualisation.diskSize = 8192;
    # Evaluating and building a NixOS system takes memory.
    virtualisation.memorySize = 3072;
  };

  answers = pkgs.writeText "answers" ''
    /dev/vda
    eth1
    eth2
    dhcp
    gw
    192.168.10.1
    hunter2hunter2
    hunter2hunter2

    /dev/vda
  '';
in
pkgs.testers.runNixOSTest {
  name = "router-setup";

  nodes = {
    installer =
      { lib, ... }:
      {
        imports = [
          sharedDisk
          (self.lib.setupModule { inherit local; })
          common.tools
        ];
        environment.etc."router-test-local.nix".source = local;
        # The interfaces router-setup offers.
        virtualisation.vlans = [
          1
          2
        ];
        virtualisation.fileSystems."/".autoFormat = true;
        virtualisation.emptyDiskImages = [ 1024 ];
        virtualisation.rootDevice = "/dev/vdb";
        nix.settings.substituters = lib.mkForce [ ];
      };

    target = {
      imports = [ sharedDisk ];
      virtualisation.vlans = [
        1
        2
      ];
      virtualisation.useBootLoader = true;
      virtualisation.useEFIBoot = true;
      virtualisation.useDefaultFilesystems = false;
      virtualisation.efi.keepVariables = false;
      virtualisation.fileSystems."/" = {
        device = "/dev/disk/by-label/this-is-not-real-and-will-never-be-used";
        fsType = "ext4";
      };
    };
  };

  testScript = ''
    installer.start()
    installer.wait_for_unit("multi-user.target")

    with subtest("router-setup refuses to install without the disk name"):
        installer.fail("printf '/dev/vda\\neth1\\neth2\\ndhcp\\n\\n\\nhunter2hunter2\\nhunter2hunter2\\n\\nno\\n' | router-setup")
        installer.fail("blkid /dev/vda1")

    with subtest("router-setup builds the answered configuration offline and installs it"):
        installer.succeed("router-setup --local /etc/router-test-local.nix < ${answers} >&2")
        installer.shutdown()

    target.state_dir = installer.state_dir
    target.start()
    target.wait_for_unit("multi-user.target")

    with subtest("the installed router has the answered settings"):
        assert target.succeed("hostname").strip() == "gw"
        target.wait_until_succeeds("ip -4 addr show dev eth2 | grep -q 192.168.10.1/24")
        target.succeed("grep -q '192.168.10.100 - 192.168.10.200' /etc/kea/dhcp4-server.conf")
        settings = target.succeed("cat /var/lib/router/config/settings.json")
        assert '"eth1"' in settings and '"dhcp"' in settings, settings
        assert target.succeed("stat -c %a /var/lib/router/webui-password").strip() == "600"

    with subtest("the web UI accepts the password given to router-setup"):
        target.wait_for_unit("router-webui.service")
        target.wait_until_succeeds("curl -sk -o /dev/null https://127.0.0.1/login")
        code = target.succeed("curl -sk -o /dev/null -w '%{http_code}' -d password=hunter2hunter2 https://127.0.0.1/login")
        assert code == "303", code

    with subtest("root logs in on the console with the same password"):
        target.wait_until_tty_matches("1", "login: ")
        target.send_chars("root\n")
        target.wait_until_tty_matches("1", "Password: ")
        target.send_chars("hunter2hunter2\n")
        target.wait_until_succeeds("pgrep -u root -t tty1 bash")
        assert target.succeed("stat -c %a /var/lib/router/root-password").strip() == "600"

    with subtest("the box rebuilds to exactly the installed system"):
        out = target.succeed("router-apply 2>&1")
        assert "no changes" in out, out
  '';
}