import ./make-test-python.nix ({ pkgs, ... }: let
  snakeOil = pkgs.runCommand "snakeoil-certs" {
    outputs = [ "out" "cacert" "cert" "key" "crl" ];
    buildInputs = [ pkgs.gnutls.bin ];
    caTemplate = pkgs.writeText "snakeoil-ca.template" ''
      cn = server
      expiration_days = -1
      cert_signing_key
      ca
    '';
    certTemplate = pkgs.writeText "snakeoil-cert.template" ''
      cn = server
      expiration_days = -1
      tls_www_server
      encryption_key
      signing_key
    '';
    crlTemplate = pkgs.writeText "snakeoil-crl.template" ''
      expiration_days = -1
    '';
    userCertTemplate = pkgs.writeText "snakeoil-user-cert.template" ''
      organization = snakeoil
      cn = server
      expiration_days = -1
      tls_www_client
      encryption_key
      signing_key
    '';
  } ''
    certtool -p --bits 4096 --outfile ca.key
    certtool -s --template "$caTemplate" --load-privkey ca.key \
                --outfile "$cacert"
    certtool -p --bits 4096 --outfile "$key"
    certtool -c --template "$certTemplate" \
                --load-ca-privkey ca.key \
                --load-ca-certificate "$cacert" \
                --load-privkey "$key" \
                --outfile "$cert"
    certtool --generate-crl --template "$crlTemplate" \
                            --load-ca-privkey ca.key \
                            --load-ca-certificate "$cacert" \
                            --outfile "$crl"

    mkdir "$out"

    # Stripping key information before the actual PEM-encoded values is solely
    # to make test output a bit less verbose when copying the client key to the
    # actual client.
    certtool -p --bits 4096 | sed -n \
      -e '/^----* *BEGIN/,/^----* *END/p' > "$out/alice.key"

    certtool -c --template "$userCertTemplate" \
                --load-privkey "$out/alice.key" \
                --load-ca-privkey ca.key \
                --load-ca-certificate "$cacert" \
                --outfile "$out/alice.cert"
  '';

in {
  name = "taskserver";

  nodes = rec {
    server = {
      services.taskserver.enable = true;
      services.taskserver.listenHost = "::";
      services.taskserver.openFirewall = true;
      services.taskserver.fqdn = "server";
      services.taskserver.organisations = {
        testOrganisation.users = [ "alice" "foo" ];
        anotherOrganisation.users = [ "bob" ];
      };

      specialisation.manual-config.configuration = {
        services.taskserver.pki.manual = {
          ca.cert = snakeOil.cacert;
          server.cert = snakeOil.cert;
          server.key = snakeOil.key;
          server.crl = snakeOil.crl;
        };
      };
    };

    client1 = { pkgs, ... }: {
      environment.systemPackages = [ pkgs.taskwarrior pkgs.gnutls ];
      users.users.alice.isNormalUser = true;
      users.users.bob.isNormalUser = true;
      users.users.foo.isNormalUser = true;
      users.users.bar.isNormalUser = true;
    };

    client2 = client1;
  };

  testScript = { nodes, ... }: let
    cfg = nodes.server.config.services.taskserver;
    portStr = toString cfg.listenPort;
    specialisations = "${nodes.server.system.build.toplevel}/specialisation";
    newServerSystem = "${specialisations}/manual-config";
    switchToNewServer = "${newServerSystem}/bin/switch-to-configuration test";
  in ''
    from shlex import quote


    def su(user, cmd):
        return f"su - {user} -c {quote(cmd)}"


    def no_extra_init(client, org, user):
        pass


    def setup_clients_for(org, user, extra_init=no_extra_init):
        for client in [client1, client2]:
            with client.nested(f"initialize client for user {user}"):
                client.succeed(
                    su(user, f"rm -rf /home/{user}/.task"),
                    su(user, "task rc.confirmation=no config confirmation no"),
                )

                exportinfo = server.succeed(f"nixos-taskserver user export {org} {user}")

                with client.nested("importing taskwarrior configuration"):
                    client.succeed(su(user, f"eval {quote(exportinfo)} >&2"))

                extra_init(client, org, user)

                client.succeed(su(user, "task config taskd.server server:${portStr} >&2"))

                client.succeed(su(user, "task sync init >&2"))


    def restart_server():
        server.systemctl("restart taskserver.service")
        server.wait_for_open_port(${portStr})


    def re_add_imperative_user():
        with server.nested("(re-)add imperative user bar"):
            server.execute("nixos-taskserver org remove imperativeOrg")
            server.succeed(
                "nixos-taskserver org add imperativeOrg",
                "nixos-taskserver user add imperativeOrg bar",
            )
            setup_clients_for("imperativeOrg", "bar")


    def test_sync(user):
        with subtest(f"sync for user {user}"):
            client1.succeed(su(user, "task add foo >&2"))
            client1.succeed(su(user, "task sync >&2"))
            client2.fail(su(user, "task list >&2"))
            client2.succeed(su(user, "task sync >&2"))
            client2.succeed(su(user, "task list >&2"))


    def check_client_cert(user):
        # debug level 3 is a workaround for gnutls issue https://gitlab.com/gnutls/gnutls/-/issues/1040
        cmd = (
            f"gnutls-cli -d 3"
            f" --x509cafile=/home/{user}/.task/keys/ca.cert"
            f" --x509keyfile=/home/{user}/.task/keys/private.key"
            f" --x509certfile=/home/{user}/.task/keys/public.cert"
            f" --port=${portStr} server < /dev/null"
        )
        return su(user, cmd)


    # Explicitly start the VMs so that we don't accidentally start newServer
    server.start()
    client1.start()
    client2.start()

    server.wait_for_unit("taskserver.service")

    server.succeed(
        "nixos-taskserver user list testOrganisation | grep -qxF alice",
        "nixos-taskserver user list testOrganisation | grep -qxF foo",
        "nixos-taskserver user list anotherOrganisation | grep -qxF bob",
    )

    server.wait_for_open_port(${portStr})

    client1.wait_for_unit("multi-user.target")
    client2.wait_for_unit("multi-user.target")

    setup_clients_for("testOrganisation", "alice")
    setup_clients_for("testOrganisation", "foo")
    setup_clients_for("anotherOrganisation", "bob")

    for user in ["alice", "bob", "foo"]:
        test_sync(user)

    server.fail("nixos-taskserver user add imperativeOrg bar")
    re_add_imperative_user()

    test_sync("bar")

    with subtest("checking certificate revocation of user bar"):
        client1.succeed(check_client_cert("bar"))

        server.succeed("nixos-taskserver user remove imperativeOrg bar")
        restart_server()

        client1.fail(check_client_cert("bar"))

        client1.succeed(su("bar", "task add destroy everything >&2"))
        client1.fail(su("bar", "task sync >&2"))

    re_add_imperative_user()

    with subtest("checking certificate revocation of org imperativeOrg"):
        client1.succeed(check_client_cert("bar"))

        server.succeed("nixos-taskserver org remove imperativeOrg")
        restart_server()

        client1.fail(check_client_cert("bar"))

        client1.succeed(su("bar", "task add destroy even more >&2"))
        client1.fail(su("bar", "task sync >&2"))

    re_add_imperative_user()

    with subtest("check whether declarative config overrides user bar"):
        restart_server()
        test_sync("bar")


    def init_manual_config(client, org, user):
        cfgpath = f"/home/{user}/.task"

        client.copy_from_host(
            "${snakeOil.cacert}",
            f"{cfgpath}/ca.cert",
        )
        for file in ["alice.key", "alice.cert"]:
            client.copy_from_host(
                f"${snakeOil}/{file}",
                f"{cfgpath}/{file}",
            )

        for file in [f"{user}.key", f"{user}.cert"]:
            client.copy_from_host(
                f"${snakeOil}/{file}",
                f"{cfgpath}/{file}",
            )

        client.succeed(
            su("alice", f"task config taskd.ca {cfgpath}/ca.cert"),
            su("alice", f"task config taskd.key {cfgpath}/{user}.key"),
            su(user, f"task config taskd.certificate {cfgpath}/{user}.cert"),
        )


    with subtest("check manual configuration"):
        # Remove the keys from automatic CA creation, to make sure the new
        # generation doesn't use keys from before.
        server.succeed("rm -rf ${cfg.dataDir}/keys/* >&2")

        server.succeed(
            "${switchToNewServer} >&2"
        )
        server.wait_for_unit("taskserver.service")
        server.wait_for_open_port(${portStr})

        server.succeed(
            "nixos-taskserver org add manualOrg",
            "nixos-taskserver user add manualOrg alice",
        )

        setup_clients_for("manualOrg", "alice", init_manual_config)

        test_sync("alice")
  '';
})
