import ./make-test.nix ({ pkgs, ... }: with pkgs.lib; let

  debug = false;

  testVMConfig = vmName: attrs: { config, pkgs, ... }: {
    boot.kernelParams = let
      miniInit = ''
        #!${pkgs.stdenv.shell} -xe
        export PATH="${pkgs.coreutils}/bin:${pkgs.utillinux}/bin"

        ${pkgs.linuxPackages.virtualboxGuestAdditions}/sbin/VBoxService
        ${(attrs.vmScript or (const "")) pkgs}

        i=0
        while [ ! -e /mnt-root/shutdown ]; do
          sleep 10
          i=$(($i + 10))
          [ $i -le 120 ] || fail
        done

        rm -f /mnt-root/boot-done /mnt-root/shutdown
      '';
    in [
      "console=tty0" "console=ttyS0" "ignore_loglevel"
      "boot.trace" "panic=1" "boot.panic_on_fail"
      "init=${pkgs.writeScript "mini-init.sh" miniInit}"
    ];

    fileSystems."/" = {
      device = "vboxshare";
      fsType = "vboxsf";
    };

    services.virtualboxGuest.enable = true;

    boot.initrd.kernelModules = [
      "af_packet" "vboxsf"
      "virtio" "virtio_pci" "virtio_ring" "virtio_net" "vboxguest"
    ];

    boot.initrd.extraUtilsCommands = ''
      copy_bin_and_libs "${pkgs.linuxPackages.virtualboxGuestAdditions}/sbin/mount.vboxsf"
      copy_bin_and_libs "${pkgs.utillinux}/bin/unshare"
      ${(attrs.extraUtilsCommands or (const "")) pkgs}
    '';

    boot.initrd.postMountCommands = ''
      touch /mnt-root/boot-done
      hostname "${vmName}"
      mkdir -p /nix/store
      unshare -m "@shell@" -c '
        mount -t vboxsf nixstore /nix/store
        exec "$stage2Init"
      '
      poweroff -f
    '';

    system.requiredKernelConfig = with config.lib.kernelConfig; [
      (isYes "SERIAL_8250_CONSOLE")
      (isYes "SERIAL_8250")
    ];
  };

  mkLog = logfile: tag: let
    rotated = map (i: "${logfile}.${toString i}") (range 1 9);
    all = concatMapStringsSep " " (f: "\"${f}\"") ([logfile] ++ rotated);
    logcmd = "tail -F ${all} 2> /dev/null | logger -t \"${tag}\"";
  in optionalString debug "$machine->execute(ru '${logcmd} & disown');";

  testVM = vmName: vmScript: let
    cfg = (import ../lib/eval-config.nix {
      system = "i686-linux";
      modules = [
        ../modules/profiles/minimal.nix
        (testVMConfig vmName vmScript)
      ];
    }).config;
  in pkgs.vmTools.runInLinuxVM (pkgs.runCommand "virtualbox-image" {
    preVM = ''
      mkdir -p "$out"
      diskImage="$(pwd)/qimage"
      ${pkgs.vmTools.qemu}/bin/qemu-img create -f raw "$diskImage" 100M
    '';

    postVM = ''
      echo "creating VirtualBox disk image..."
      ${pkgs.vmTools.qemu}/bin/qemu-img convert -f raw -O vdi \
        "$diskImage" "$out/disk.vdi"
    '';

    buildInputs = [ pkgs.utillinux pkgs.perl ];
  } ''
    ${pkgs.parted}/sbin/parted /dev/vda mklabel msdos
    ${pkgs.parted}/sbin/parted /dev/vda -- mkpart primary ext2 1M -1s
    . /sys/class/block/vda1/uevent
    mknod /dev/vda1 b $MAJOR $MINOR

    ${pkgs.e2fsprogs}/sbin/mkfs.ext4 /dev/vda1
    ${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda1
    mkdir /mnt
    mount /dev/vda1 /mnt
    cp "${cfg.system.build.kernel}/bzImage" /mnt/linux
    cp "${cfg.system.build.initialRamdisk}/initrd" /mnt/initrd

    ${pkgs.grub2}/bin/grub-install --boot-directory=/mnt /dev/vda

    cat > /mnt/grub/grub.cfg <<GRUB
    set root=hd0,1
    linux /linux ${concatStringsSep " " cfg.boot.kernelParams}
    initrd /initrd
    boot
    GRUB
    umount /mnt
  '');

  createVM = name: attrs: let
    mkFlags = concatStringsSep " ";

    sharePath = "/home/alice/vboxshare-${name}";

    createFlags = mkFlags [
      "--ostype Linux26"
      "--register"
    ];

    vmFlags = mkFlags ([
      "--uart1 0x3F8 4"
      "--uartmode1 client /run/virtualbox-log-${name}.sock"
    ] ++ (attrs.vmFlags or []));

    controllerFlags = mkFlags [
      "--name SATA"
      "--add sata"
      "--bootable on"
      "--hostiocache on"
    ];

    diskFlags = mkFlags [
      "--storagectl SATA"
      "--port 0"
      "--device 0"
      "--type hdd"
      "--mtype immutable"
      "--medium ${testVM name attrs}/disk.vdi"
    ];

    sharedFlags = mkFlags [
      "--name vboxshare"
      "--hostpath ${sharePath}"
    ];

    nixstoreFlags = mkFlags [
      "--name nixstore"
      "--hostpath /nix/store"
      "--readonly"
    ];
  in {
    machine = {
      systemd.sockets = listToAttrs (singleton {
        name = "vboxtestlog-${name}";
        value = {
          description = "VirtualBox Test Machine Log Socket";
          wantedBy = [ "sockets.target" ];
          before = [ "multi-user.target" ];
          socketConfig.ListenStream = "/run/virtualbox-log-${name}.sock";
          socketConfig.Accept = true;
        };
      });

      systemd.services = listToAttrs (singleton {
        name = "vboxtestlog-${name}@";
        value = {
          description = "VirtualBox Test Machine Log";
          serviceConfig.StandardInput = "socket";
          serviceConfig.StandardOutput = "syslog";
          serviceConfig.SyslogIdentifier = "GUEST-${name}";
          serviceConfig.ExecStart = "${pkgs.coreutils}/bin/cat";
        };
      });
    };

    testSubs = ''
      sub checkRunning_${name} {
        my $cmd = 'VBoxManage list runningvms | grep -q "^\"${name}\""';
        my ($status, $out) = $machine->execute(ru $cmd);
        return $status == 0;
      }

      sub cleanup_${name} {
        $machine->execute(ru "VBoxManage controlvm ${name} poweroff")
          if checkRunning_${name};
        $machine->succeed("rm -rf ${sharePath}");
        $machine->succeed("mkdir -p ${sharePath}");
        $machine->succeed("chown alice.users ${sharePath}");
      }

      sub createVM_${name} {
        vbm("createvm --name ${name} ${createFlags}");
        vbm("modifyvm ${name} ${vmFlags}");
        vbm("setextradata ${name} VBoxInternal/PDM/HaltOnReset 1");
        vbm("storagectl ${name} ${controllerFlags}");
        vbm("storageattach ${name} ${diskFlags}");
        vbm("sharedfolder add ${name} ${sharedFlags}");
        vbm("sharedfolder add ${name} ${nixstoreFlags}");
        cleanup_${name};

        ${mkLog "$HOME/VirtualBox VMs/${name}/Logs/VBox.log" "HOST-${name}"}
      }

      sub destroyVM_${name} {
        cleanup_${name};
        vbm("unregistervm ${name} --delete");
      }

      sub waitForVMBoot_${name} {
        $machine->execute(ru(
          'set -e; i=0; '.
          'while ! test -e ${sharePath}/boot-done; do '.
          'sleep 10; i=$(($i + 10)); [ $i -le 3600 ]; '.
          'VBoxManage list runningvms | grep -q "^\"${name}\""; '.
          'done'
        ));
      }

      sub waitForIP_${name} ($) {
        my $property = "/VirtualBox/GuestInfo/Net/$_[0]/V4/IP";
        my $getip = "VBoxManage guestproperty get ${name} $property | ".
                    "sed -n -e 's/^Value: //p'";
        my $ip = $machine->succeed(ru(
          'for i in $(seq 1000); do '.
          'if ipaddr="$('.$getip.')" && [ -n "$ipaddr" ]; then '.
          'echo "$ipaddr"; exit 0; '.
          'fi; '.
          'sleep 1; '.
          'done; '.
          'echo "Could not get IPv4 address for ${name}!" >&2; '.
          'exit 1'
        ));
        chomp $ip;
        return $ip;
      }

      sub waitForStartup_${name} {
        for (my $i = 0; $i <= 120; $i += 10) {
          $machine->sleep(10);
          return if checkRunning_${name};
          eval { $_[0]->() } if defined $_[0];
        }
        die "VirtualBox VM didn't start up within 2 minutes";
      }

      sub waitForShutdown_${name} {
        for (my $i = 0; $i <= 120; $i += 10) {
          $machine->sleep(10);
          return unless checkRunning_${name};
        }
        die "VirtualBox VM didn't shut down within 2 minutes";
      }

      sub shutdownVM_${name} {
        $machine->succeed(ru "touch ${sharePath}/shutdown");
        $machine->waitUntilSucceeds(
          "test ! -e ${sharePath}/shutdown ".
          "  -a ! -e ${sharePath}/boot-done"
        );
        waitForShutdown_${name};
      }
    '';
  };

  hostonlyVMFlags = [
    "--nictype1 virtio"
    "--nictype2 virtio"
    "--nic2 hostonly"
    "--hostonlyadapter2 vboxnet0"
  ];

  dhcpScript = pkgs: ''
    ${pkgs.dhcp}/bin/dhclient \
      -lf /run/dhcp.leases \
      -pf /run/dhclient.pid \
      -v eth0 eth1

    otherIP="$(${pkgs.netcat}/bin/netcat -clp 1234 || :)"
    ${pkgs.iputils}/bin/ping -I eth1 -c1 "$otherIP"
    echo "$otherIP reachable" | ${pkgs.netcat}/bin/netcat -clp 5678 || :
  '';

  vboxVMs = mapAttrs createVM {
    simple = {};

    test1.vmFlags = hostonlyVMFlags;
    test1.vmScript = dhcpScript;

    test2.vmFlags = hostonlyVMFlags;
    test2.vmScript = dhcpScript;
  };

in {
  name = "virtualbox";

  machine = { pkgs, lib, config, ... }: {
    imports = let
      mkVMConf = name: val: val.machine // { key = "${name}-config"; };
      vmConfigs = mapAttrsToList mkVMConf vboxVMs;
    in [ ./common/user-account.nix ./common/x11.nix ] ++ vmConfigs;
    virtualisation.memorySize = 768;
    services.virtualboxHost.enable = true;
    users.extraUsers.alice.extraGroups = let
      inherit (config.services.virtualboxHost) enableHardening;
    in lib.mkIf enableHardening (lib.singleton "vboxusers");
  };

  testScript = ''
    sub ru ($) {
      my $esc = $_[0] =~ s/'/'\\${"'"}'/gr;
      return "su - alice -c '$esc'";
    }

    sub vbm {
      $machine->succeed(ru("VBoxManage ".$_[0]));
    };

    ${concatStrings (mapAttrsToList (_: getAttr "testSubs") vboxVMs)}

    $machine->waitForX;

    ${mkLog "$HOME/.config/VirtualBox/VBoxSVC.log" "HOST-SVC"}

    createVM_simple;

    subtest "simple-gui", sub {
      $machine->succeed(ru "VirtualBox &");
      $machine->waitForWindow(qr/Oracle VM VirtualBox Manager/);
      $machine->sleep(5);
      $machine->screenshot("gui_manager_started");
      $machine->sendKeys("ret");
      $machine->screenshot("gui_manager_sent_startup");
      waitForStartup_simple (sub {
        $machine->sendKeys("ret");
      });
      $machine->screenshot("gui_started");
      waitForVMBoot_simple;
      $machine->screenshot("gui_booted");
      shutdownVM_simple;
      $machine->sleep(5);
      $machine->screenshot("gui_stopped");
      $machine->sendKeys("ctrl-q");
      $machine->sleep(5);
      $machine->screenshot("gui_manager_stopped");
    };

    cleanup_simple;

    subtest "simple-cli", sub {
      vbm("startvm simple");
      waitForStartup_simple;
      $machine->screenshot("cli_started");
      waitForVMBoot_simple;
      $machine->screenshot("cli_booted");
      shutdownVM_simple;
    };

    subtest "privilege-escalation", sub {
      $machine->fail("test -e '/root/VirtualBox VMs'");
      $machine->fail("test -e '/root/.config/VirtualBox'");
      $machine->succeed("test -e '/home/alice/VirtualBox VMs'");
    };

    destroyVM_simple;

    subtest "net-hostonlyif", sub {
      createVM_test1;
      createVM_test2;

      vbm("startvm test1");
      waitForStartup_test1;

      vbm("startvm test2");
      waitForStartup_test2;

      waitForVMBoot_test1;
      waitForVMBoot_test2;

      $machine->screenshot("net_booted");

      my $test1IP = waitForIP_test1 1;
      my $test2IP = waitForIP_test2 1;

      $machine->succeed("echo '$test2IP' | netcat -c '$test1IP' 1234");
      $machine->succeed("echo '$test1IP' | netcat -c '$test2IP' 1234");

      $machine->waitUntilSucceeds("netcat -c '$test1IP' 5678 >&2");
      $machine->waitUntilSucceeds("netcat -c '$test2IP' 5678 >&2");

      shutdownVM_test1;
      shutdownVM_test2;

      destroyVM_test1;
      destroyVM_test2;
    };
  '';
})