#!/usr/bin/env bash
export LC_ALL=C

function disk_delete() {
  if [ -e "${disk_img}" ]; then
    rm "${disk_img}"
    echo "SUCCESS! Deleted ${disk_img}"
  else
    echo "NOTE! ${disk_img} not found. Doing nothing."
  fi
  local VMNAME=""
  VMNAME=$(basename "${VM}" .conf)
  local SHORTCUT_DIR="${HOME}/.local/share/applications/"
  if [ -e "${SHORTCUT_DIR}/${VMNAME}.desktop" ]; then
    rm "${SHORTCUT_DIR}/${VMNAME}.desktop"
    echo "Deleted ${VM} desktop shortcut"
  fi
}

function snapshot_apply() {
  local TAG="${1}"
  if [ -z "${TAG}" ]; then
    echo "ERROR! No snapshot tag provided."
    exit
  fi

  if [ -e "${disk_img}" ]; then
    if ${QEMU_IMG} snapshot -q -a "${TAG}" "${disk_img}"; then
      echo "SUCCESS! Applied snapshot ${TAG} to ${disk_img}"
    else
      echo "ERROR! Failed to apply snapshot ${TAG} to ${disk_img}"
    fi
  else
    echo "NOTE! ${disk_img} not found. Doing nothing."
  fi
}

function snapshot_create() {
  local TAG="${1}"
  if [ -z "${TAG}" ]; then
    echo "ERROR! No snapshot tag provided."
    exit
  fi

  if [ -e "${disk_img}" ]; then
    if ${QEMU_IMG} snapshot -q -c "${TAG}" "${disk_img}"; then
      echo "SUCCESS! Created snapshot ${TAG} of ${disk_img}"
    else
      echo "ERROR! Failed to create snapshot ${TAG} of ${disk_img}"
    fi
  else
    echo "NOTE! ${disk_img} not found. Doing nothing."
  fi
}

function snapshot_delete() {
  local TAG="${1}"
  if [ -z "${TAG}" ]; then
    echo "ERROR! No snapshot tag provided."
    exit
  fi

  if [ -e "${disk_img}" ]; then
    if ${QEMU_IMG} snapshot -q -d "${TAG}" "${disk_img}"; then
      echo "SUCCESS! Deleted snapshot ${TAG} of ${disk_img}"
    else
      echo "ERROR! Failed to delete snapshot ${TAG} of ${disk_img}"
    fi
  else
    echo "NOTE! ${disk_img} not found. Doing nothing."
  fi
}

function snapshot_info() {
  if [ -e "${disk_img}" ]; then
    ${QEMU_IMG} info "${disk_img}"
  fi
}

function get_port() {
    local PORT_START=$1
    local PORT_RANGE=$2
    while true; do
        local CANDIDATE=$((PORT_START + (RANDOM % PORT_RANGE)))
        (echo "" >/dev/tcp/127.0.0.1/${CANDIDATE}) >/dev/null 2>&1
        if [ ${?} -ne 0 ]; then
            echo "${CANDIDATE}"
            break
        fi
    done
}

function enable_usb_passthrough() {
  local DEVICE=""
  local USB_BUS=""
  local USB_DEV=""
  local USB_NAME=""
  local VENDOR_ID=""
  local PRODUCT_ID=""
  local USB_NOT_READY=0

  # Have any USB devices been requested for pass-through?
  if (( ${#usb_devices[@]} )); then
    echo " - USB:      Host pass-through requested:"
    for DEVICE in "${usb_devices[@]}"; do
      VENDOR_ID=$(echo "${DEVICE}" | cut -d':' -f1)
      PRODUCT_ID=$(echo "${DEVICE}" | cut -d':' -f2)
      USB_BUS=$(lsusb -d "${VENDOR_ID}:${PRODUCT_ID}" | cut -d' ' -f2)
      USB_DEV=$(lsusb -d "${VENDOR_ID}:${PRODUCT_ID}" | cut -d' ' -f4 | cut -d':' -f1)
      USB_NAME=$(lsusb -d "${VENDOR_ID}:${PRODUCT_ID}" | cut -d' ' -f7-)
      if [ -w "/dev/bus/usb/${USB_BUS}/${USB_DEV}" ]; then
        echo "             o ${USB_NAME} on bus ${USB_BUS} device ${USB_DEV} is accessible."
      else
        echo "             x ${USB_NAME} on bus ${USB_BUS} device ${USB_DEV} needs permission changes:"
        echo "               sudo chown -v root:${USER} /dev/bus/usb/${USB_BUS}/${USB_DEV}"
        USB_NOT_READY=1
      fi
      USB_PASSTHROUGH="${USB_PASSTHROUGH} -device usb-host,bus=hostpass.0,vendorid=0x${VENDOR_ID},productid=0x${PRODUCT_ID}"
    done

    if [ "${USB_NOT_READY}" -eq 1 ]; then
        echo "               ERROR! USB permission changes are required 👆"
      exit 1
    fi
  fi
}

function check_cpu_flag() {
  local HOST_CPU_FLAG="${1}"
  if lscpu | grep -o "^Flags\b.*: .*\b${HOST_CPU_FLAG}\b" > /dev/null; then
    return 0
  else
    return 1
  fi
}

function vm_boot() {
  local VMNAME=""
  VMNAME=$(basename "${VM}" .conf)
  local VMDIR=""
  VMDIR=$(dirname "${disk_img}")
  local BALLOON="-device virtio-balloon"
  local CPU=""
  local GUEST_CPU_CORES=""
  local GUEST_CPU_LOGICAL_CORES=""
  local GUEST_CPU_THREADS=""
  local HOST_CPU_CORES=""
  local HOST_CPU_SMT=""
  local HOST_CPU_SOCKETS=""
  local HOST_CPU_VENDOR=""
  local DISPLAY_DEVICE=""
  local GL="on"
  local GUEST_TWEAKS=""
  local MAC_BOOTLOADER=""
  local MAC_MISSING=""
  local MAC_DISK_DEV="ide-hd,bus=ahci.2"
  local NET_DEVICE="virtio-net"
  local OSK=""
  local QEMU_VER=""
  local USB_HOST_PASSTHROUGH_CONTROLLER="qemu-xhci"
  local VIDEO=""
  QEMU_VER=$(${QEMU} -version | head -n1 | cut -d' ' -f4 | cut -d'(' -f1)
  echo "Quickemu ${VERSION} starting ${VM}"
  echo " - QEMU:     ${QEMU} v${QEMU_VER}"

  # Force to lowercase.
  boot=${boot,,}
  guest_os=${guest_os,,}

  # Always Boot macOS using EFI
  if [ "${guest_os}" == "macos" ]; then
    boot="efi"
    echo " - BOOT:     EFI (${guest_os})"
    if [ -e "${VMDIR}/OVMF_CODE.fd" ] && [ -e "${VMDIR}/OVMF_VARS-1024x768.fd" ]; then
      local EFI_CODE="${VMDIR}/OVMF_CODE.fd"
      local EFI_VARS="${VMDIR}/OVMF_VARS-1024x768.fd"
    else
      MAC_MISSING="Firmware"
    fi

    if [ -e "${VMDIR}/OpenCore.qcow2" ]; then
      MAC_BOOTLOADER="${VMDIR}/OpenCore.qcow2"
    elif [ -e "${VMDIR}/ESP.qcow2" ]; then
      # Backwards compatibility for Clover
      MAC_BOOTLOADER="${VMDIR}/ESP.qcow2"
    else
      MAC_MISSING="Bootloader"
    fi

    if [ -n "${MAC_MISSING}" ]; then
      echo "ERROR! macOS ${MAC_MISSING} was not found."
      echo "       Use 'quickget' to download the required files."
      exit 1
    fi
  elif [[ "${boot}" == *"efi"* ]]; then
    if [ -e "/usr/share/OVMF/OVMF_CODE_4M.fd" ]; then
      echo " - BOOT:     EFI (${guest_os})"
      local EFI_CODE="/usr/share/OVMF/OVMF_CODE_4M.fd"
      local EFI_VARS="${VMDIR}/OVMF_VARS_4M.fd"
      if [ -e "${VMDIR}/${VMNAME}-vars.fd" ]; then
        # Preserve backward compatibility
        mv "${VMDIR}/${VMNAME}-vars.fd" "${EFI_VARS}"
      elif [ ! -e "${EFI_VARS}" ]; then
        cp "/usr/share/OVMF/OVMF_VARS_4M.fd" "${EFI_VARS}"
      fi
    else
      boot="legacy"
      echo " - BOOT:     Legacy BIOS (${guest_os}) - EFI requested but no EFI firmware found."
    fi
  else
    echo " - BOOT:     Legacy BIOS (${guest_os})"
  fi

  HOST_CPU_CORES=$(nproc --all)
  HOST_CPU_VENDOR=$(lscpu | grep -E 'Vendor' | cut -d':' -f2 | sed 's/ //g')
  HOST_CPU_SOCKETS=$(lscpu | grep -E 'Socket' | cut -d':' -f2 | sed 's/ //g')

  # A CPU with Intel VT-x / AMD SVM support is required
  if [ "${HOST_CPU_VENDOR}" == "AuthenticIntel" ]; then
    if ! check_cpu_flag vmx; then
      echo "ERROR! Intel VT-x support is required."
      exit 1
    fi
  elif [ "${HOST_CPU_VENDOR}" == "AuthenticAMD" ]; then
    if ! check_cpu_flag svm; then
      echo "ERROR! AMD SVM support is required."
      exit 1
    fi
  fi

  if [ -z "${cpu_cores}" ]; then
      if [ "${HOST_CPU_CORES}" -ge 32 ]; then
        GUEST_CPU_CORES="16"
      elif [ "${HOST_CPU_CORES}" -ge 16 ]; then
        GUEST_CPU_CORES="8"
      elif [ "${HOST_CPU_CORES}" -ge 8 ]; then
        GUEST_CPU_CORES="4"
      elif [ "${HOST_CPU_CORES}" -ge 4 ]; then
        GUEST_CPU_CORES="2"
      else
        GUEST_CPU_CORES="1"
      fi
  else
      GUEST_CPU_CORES="${cpu_cores}"
  fi

  # Account for Hyperthreading/SMT.
  if [ -e /sys/devices/system/cpu/smt/control ] && [ "${GUEST_CPU_CORES}" -ge 2 ]; then
    HOST_CPU_SMT=$(cat /sys/devices/system/cpu/smt/control)
    case ${HOST_CPU_SMT} in
      on)
        GUEST_CPU_THREADS=2
        GUEST_CPU_LOGICAL_CORES=$(( GUEST_CPU_CORES / GUEST_CPU_THREADS ))
        ;;
      *)
        GUEST_CPU_THREADS=1
        GUEST_CPU_LOGICAL_CORES=${GUEST_CPU_CORES}
        ;;
    esac
  else
    GUEST_CPU_THREADS=1
    GUEST_CPU_LOGICAL_CORES=${GUEST_CPU_CORES}
  fi

  local SMP="-smp cores=${GUEST_CPU_LOGICAL_CORES},threads=${GUEST_CPU_THREADS},sockets=${HOST_CPU_SOCKETS}"
  echo -n " - CPU:      ${HOST_CPU_SOCKETS} Socket(s), ${GUEST_CPU_LOGICAL_CORES} Core(s), ${GUEST_CPU_THREADS} Thread(s)"

  local RAM_VM="2G"
  if [ -z "${ram}" ]; then
      local RAM_HOST=""
      RAM_HOST=$(free --mega -h | grep Mem | cut -d':' -f2 | cut -d'G' -f1 | sed 's/ //g')
      #Round up - https://github.com/wimpysworld/quickemu/issues/11
      RAM_HOST=$(printf '%.*f\n' 0 "${RAM_HOST}")
      if [ "${RAM_HOST}" -ge 256 ]; then
        RAM_VM="32G"
      elif [ "${RAM_HOST}" -ge 128 ]; then
        RAM_VM="16G"
      elif [ "${RAM_HOST}" -ge 64 ]; then
        RAM_VM="8G"
      elif [ "${RAM_HOST}" -ge 32 ]; then
        RAM_VM="4G"
      elif [ "${RAM_HOST}" -ge 16 ]; then
        RAM_VM="3G"
      fi
  else
      RAM_VM="${ram}"
  fi
  echo ", ${RAM_VM} RAM"

  # Make any OS specific adjustments
  case ${guest_os} in
    linux)
      CPU="-cpu host,kvm=on"
      if [ "${HOST_CPU_VENDOR}" == "AuthenticAMD" ]; then
        CPU="${CPU},topoext"
      fi
      disk_size="16G"
      ;;
    macos)
      #https://www.nicksherlock.com/2020/06/installing-macos-big-sur-on-proxmox/
      # A CPU with SSE4.1 support is required for >= macOS Sierra
      # A CPU with AVX2 support is required for >= macOS Mojave
      if check_cpu_flag sse4_1 && check_cpu_flag avx2; then
        case ${HOST_CPU_VENDOR} in
          AuthenticIntel)
            CPU="-cpu host,kvm=on,vendor=GenuineIntel,+hypervisor,+invtsc,+kvm_pv_eoi,+kvm_pv_unhalt";;
          AuthenticAMD|*)
            # Used in past versions: +movbe,+smep,+xgetbv1,+xsavec
            # Warn on AMD:           +fma4,+pcid
            CPU="-cpu Penryn,kvm=on,vendor=GenuineIntel,+aes,+avx,+avx2,+bmi1,+bmi2,+fma,+hypervisor,+invtsc,+kvm_pv_eoi,+kvm_pv_unhalt,+popcnt,+ssse3,+sse4.2,vmware-cpuid-freq=on,+xsave,+xsaveopt,check";;
        esac
      else
        echo "ERROR! macOS requires a CPU with SSE 4.1 and AVX2 support."
        exit 1
      fi

      # Tune Qemu optimisations based on the macOS release, or fallback to lowest
      # common supported options if none is specificed.
      #   * VirtIO Block Media doesn't work in High Sierra (at all) or the Mojave (Recovery Image)
      #   * VirtIO Network is supported in Big Sur
      #   * VirtIO Memory Balloning is supported in Big Sur (https://pmhahn.github.io/virtio-balloon/)
      #   * VirtIO RNG is supported in Big Sur, but exposed to all guests.
      case ${macos_release} in
        catalina)
          BALLOON=""
          MAC_DISK_DEV="virtio-blk-pci"
          NET_DEVICE="vmxnet3"
          USB_HOST_PASSTHROUGH_CONTROLLER="usb-ehci"
          ;;
        big-sur)
          BALLOON="-device virtio-balloon"
          MAC_DISK_DEV="virtio-blk-pci"
          NET_DEVICE="virtio-net"
          USB_HOST_PASSTHROUGH_CONTROLLER="qemu-xhci"
          ;;
        *)
          # Backwards compatibility if no macos_release is specified.
          # Also safe catch all for High Sierra and Mojave
          BALLOON=""
          MAC_DISK_DEV="ide-hd,bus=ahci.2"
          NET_DEVICE="vmxnet3"
          USB_HOST_PASSTHROUGH_CONTROLLER="usb-ehci"
          ;;
      esac
      OSK=$(echo "bheuneqjbexolgurfrjbeqfthneqrqcyrnfrqbagfgrny(p)NccyrPbzchgreVap" | tr 'A-Za-z' 'N-ZA-Mn-za-m')
      GUEST_TWEAKS="-device isa-applesmc,osk=${OSK} -no-hpet -global kvm-pit.lost_tick_policy=discard"
      disk_size="64G"
      ;;
    windows)
      CPU="-cpu host,kvm=on,+hypervisor,+invtsc,l3-cache=on,migratable=no,hv_frequencies,kvm_pv_unhalt,hv_reenlightenment,hv_relaxed,hv_spinlocks=8191,hv_stimer,hv_synic,hv_time,hv_vapic,hv_vendor_id=1234567890ab,hv_vpindex"
      if [ "${HOST_CPU_VENDOR}" == "AuthenticAMD" ]; then
        CPU="${CPU},topoext"
      fi
      GUEST_TWEAKS="-no-hpet -global kvm-pit.lost_tick_policy=discard"
      disk_size="64G"
      ;;
    *)
      CPU="-cpu host,kvm=on"
      NET_DEVICE="rtl8139"
      echo "WARNING! Unrecognised guest OS: ${guest_os}"
      ;;
  esac

  echo " - Disk:     ${disk_img} (${disk_size})"
  if [ ! -f "${disk_img}" ]; then
      # If there is no disk image, create a new image.
      mkdir -p "${VMDIR}" 2>/dev/null
      case ${preallocation} in
        off|metadata|falloc|full) true;;
        *)
          echo "ERROR! ${preallocation} is an unsupported disk preallocation option."
          exit 1;;
      esac

      # https://blog.programster.org/qcow2-performance
      if ! ${QEMU_IMG} create -q -f qcow2 -o lazy_refcounts=on,preallocation="${preallocation}" "${disk_img}" "${disk_size}"; then
        echo "ERROR! Failed to create ${disk_img}"
        exit 1
      fi

      if [ -z "${iso}" ] && [ -z "${img}" ]; then
        echo "ERROR! You haven't specified a .iso or .img image to boot from."
        exit 1
      fi
      echo "             Just created, booting from ${iso}${img}"
  elif [ -e "${disk_img}" ]; then
    # Check there isn't already a process attached to the disk image.
    if ! ${QEMU_IMG} info "${disk_img}" >/dev/null; then
      echo "             Failed to get \"write\" lock. Is another process using the disk?"
      exit 1
    else
      DISK_CURR_SIZE=$(stat -c%s "${disk_img}")
      if [ "${DISK_CURR_SIZE}" -le "${DISK_MIN_SIZE}" ]; then
        echo "             Looks unused, booting from ${iso}${img}"
        if [ -z "${iso}" ] && [ -z "${img}" ]; then
          echo "ERROR! You haven't specified a .iso or .img image to boot from."
          exit 1
        fi
      else
        # If there is a disk image, assume there is an install and do not boot
        # from installation media.
        iso=""
        img=""
      fi
    fi
  fi

  # Has the status quo been requested?
  if [ "${STATUS_QUO}" == "-snapshot" ]; then
    if [ -z "${img}" ] && [ -z "${iso}" ]; then
      echo "             Existing disk state will be preserved, no writes will be committed."
    fi
  fi

  if [ -n "${iso}" ] && [ -e "${iso}" ]; then
    echo " - Boot ISO: ${iso}"
  elif [ -n "${img}" ] && [ -e "${img}" ]; then
    echo " - Recovery: ${img}"
  fi

  if [ -n "${fixed_iso}" ] && [ -e "${fixed_iso}" ]; then
    echo " - CD-ROM:   ${fixed_iso}"
  fi

  local X_RES=1152
  local Y_RES=648
  if [ "${XDG_SESSION_TYPE}" == "x11" ]; then
    local LOWEST_WIDTH=""
    if [ -z "${SCREEN}" ]; then
      LOWEST_WIDTH=$(xrandr --listmonitors | grep -v Monitors | cut -d' ' -f4 | cut -d'/' -f1 | sort | head -n1)
    else
      LOWEST_WIDTH=$(xrandr --listmonitors | grep -v Monitors | grep "^ ${SCREEN}:" | cut -d' ' -f4 | cut -d'/' -f1 | head -n1)
    fi
    if [ "${FULLSCREEN}" ]; then
      if [ -z "${SCREEN}" ]; then
        X_RES=$(xrandr --listmonitors | grep -v Monitors | cut -d' ' -f4 | cut -d'/' -f1 | sort | head -n1)
        Y_RES=$(xrandr --listmonitors | grep -v Monitors | cut -d' ' -f4 | cut -d'/' -f2 | cut -d'x' -f2 | sort | head -n1)
      else
        X_RES=$(xrandr --listmonitors | grep -v Monitors | grep "^ ${SCREEN}:" | cut -d' ' -f4 | cut -d'/' -f1 | head -n1)
        Y_RES=$(xrandr --listmonitors | grep -v Monitors | grep "^ ${SCREEN}:" | cut -d' ' -f4 | cut -d'/' -f2 | cut -d'x' -f2 | head -n1)
      fi
    elif [ "${LOWEST_WIDTH}" -ge 3840 ]; then
      X_RES=3200
      Y_RES=1800
    elif [ "${LOWEST_WIDTH}" -ge 2560 ]; then
      X_RES=2048
      Y_RES=1152
    elif [ "${LOWEST_WIDTH}" -ge 1920 ]; then
      X_RES=1664
      Y_RES=936
    elif [ "${LOWEST_WIDTH}" -ge 1280 ]; then
      X_RES=1152
      Y_RES=648
    fi
  fi

  if [ "${guest_os}" != "macos" ]; then
    echo " - Screen:   ${X_RES}x${Y_RES}"
  fi

  # https://www.kraxel.org/blog/2019/09/display-devices-in-qemu/
  if [ "${guest_os}" == "linux" ]; then
    case ${OUTPUT} in
      spice) DISPLAY_DEVICE="qxl-vga";;
      *) DISPLAY_DEVICE="virtio-vga";;
    esac
  elif [ "${guest_os}" == "macos" ]; then
    # Tweak video device based on the guest macOS release.
    # Displays in System Preferences can be used to select a resolution if:
    #  - qxl is used on Big Sur and Catalina
    #  - VGA is used on Mojave, although available resolutions are all 4:3
    #  - High Sierra will run at the default 1920x1080 only.
    case ${macos_release} in
      catalina|big-sur) DISPLAY_DEVICE="qxl";;
      *) DISPLAY_DEVICE="VGA";;
    esac
  elif [ "${guest_os}" == "windows" ]; then
    DISPLAY_DEVICE="qxl-vga"
  else
    DISPLAY_DEVICE="qxl-vga"
  fi

  echo -n " - Display:  ${OUTPUT^^}, ${DISPLAY_DEVICE}"

  if [ "${OUTPUT}" == "spice" ]; then
    OUTPUT="none"
  fi

  # Build the video configuration
  VIDEO="-device ${DISPLAY_DEVICE}"

  # Do not try and coerce the display resolution for macOS
  if [ "${guest_os}" != "macos" ]; then
    VIDEO="${VIDEO},xres=${X_RES},yres=${Y_RES}"
  fi

  # Allocate VRAM to VGA devices
  if [ "${DISPLAY_DEVICE}" == "qxl-vga" ] || [ "${DISPLAY_DEVICE}" == "VGA" ]; then
    VIDEO="${VIDEO},vgamem_mb=128"
  fi
  VIDEO="${VIDEO} ${FULLSCREEN}"

  if [ "${OUTPUT}" == "gtk" ]; then
    OUTPUT="${OUTPUT},grab-on-hover=on,zoom-to-fit=off"
    # GL is not working with GTK and virtio-vga
    if [ "${DISPLAY_DEVICE}" == "virtio-vga" ]; then
      GL="off"
    fi
  fi

  if [ "${OUTPUT}" != "none" ]; then
    OUTPUT="${OUTPUT},gl=${GL}"
  fi

  if [ "${GL}" == "on" ] && [[ "${DISPLAY_DEVICE}" == *"virtio"* ]]; then
    DISPLAY_DEVICE="${DISPLAY_DEVICE},virgl=on"
    echo ", GL (${GL}), VirGL (on)"
  else
    echo ", GL (${GL}), VirGL (off)"
  fi

  # Set the hostname of the VM
  local NET="user,hostname=${VMNAME}"

  # Find a free port to expose ssh to the guest
  local SSH_PORT=""
  SSH_PORT=$(get_port 22220 9)
  if [ -n "${SSH_PORT}" ]; then
    NET="${NET},hostfwd=tcp::${SSH_PORT}-:22"
    echo " - ssh:      On host:  ssh user@localhost -p ${SSH_PORT}"
  else
    echo " - ssh:      All ssh ports have been exhausted."
  fi

  # Have any port forwards been requested?
  if (( ${#port_forwards[@]} )); then
    echo " - PORTS:    Port forwards requested:"
    for FORWARD in "${port_forwards[@]}"; do
      HOST_PORT=$(echo "${FORWARD}" | cut -d':' -f1)
      GUEST_PORT=$(echo "${FORWARD}" | cut -d':' -f2)
      echo "              - ${HOST_PORT} => ${GUEST_PORT}"
      NET="${NET},hostfwd=tcp::${HOST_PORT}-:${GUEST_PORT}"
    done
  fi

  # Find a free port for spice
  local SPICE="disable-ticketing=on"
  local SPICE_PORT=""
  SPICE_PORT=$(get_port 5930 9)
  if [ -z "${SPICE_PORT}" ]; then
    echo " - SPICE:    All SPICE ports have been exhausted."
    if [ "${OUTPUT}" == "none" ] || [ "${OUTPUT}" == "spice-app" ]; then
      echo "             ERROR! Requested SPICE display, but no SPICE ports are free."
      exit 1
    fi
  else
    if [ "${OUTPUT}" == "spice-app" ]; then
      echo " - SPICE:    Enabled"
    else
      echo -n " - SPICE:    On host:  spicy --title \"${VMNAME}\" --port ${SPICE_PORT}"
      if [ "${guest_os}" != "macos" ]; then
        echo -n " --spice-shared-dir ${PUBLIC}"
      fi
      echo "${FULLSPICY}"
      SPICE="${SPICE},port=${SPICE_PORT}"
    fi

    # Reference: https://gitlab.gnome.org/GNOME/phodav/-/issues/5
    if [ "${guest_os}" != "macos" ]; then
      echo " - WebDAV:   On guest: dav://localhost:9843/"
    fi

    if [ "${guest_os}" != "windows" ]; then
      echo -n " - 9P:       On guest: "
      if [ "${guest_os}" == "linux" ]; then
        echo "sudo mount -t 9p -o trans=virtio,version=9p2000.L,msize=104857600 ${PUBLIC_TAG} ~/Public"
      elif [ "${guest_os}" == "macos" ]; then
        # PUBLICSHARE needs to be world writeable for seamless integration with
        # macOS. Test if it is world writeable, and prompt what to do if not.
        echo "sudo mount_9p ${PUBLIC_TAG}"
        if [ -n "${PUBLIC}" ] && [ "${PUBLIC_PERMS}" != "drwxrwxrwx" ]; then
          echo " - 9P:       On host:  chmod 777 ${PUBLIC}"
          echo "             Required for macOS integration 👆"
        fi
      fi
    fi
  fi

  enable_usb_passthrough

  # Boot the VM
  local args=()

  # shellcheck disable=SC2054,SC2206,SC2140
  args+=(-name ${VMNAME},process=${VMNAME}
         -enable-kvm -machine q35,vmport=off ${GUEST_TWEAKS}
         ${CPU} ${SMP}
         -m ${RAM_VM} ${BALLOON}
         -smbios type=2,manufacturer="Wimpys World",product="Quickemu",version="${VERSION}",serial="jvzclfjbeyq.pbz",location="wimpysworld.com",asset="${VMNAME}"
         ${VIDEO} -display ${OUTPUT}
         -device usb-ehci,id=input
         -device usb-kbd,bus=input.0
         -device usb-tablet,bus=input.0
         -device ${NET_DEVICE},netdev=nic -netdev ${NET},id=nic
         -audiodev pa,id=audio0,out.mixing-engine=off,out.stream-name=${LAUNCHER}-${VMNAME},in.stream-name=${LAUNCHER}-${VMNAME}
         -device intel-hda -device hda-duplex,audiodev=audio0
         -rtc base=localtime,clock=host,driftfix=slew
         -spice ${SPICE}
         -device virtio-serial-pci
         -chardev spicevmc,id=vdagent0,name=vdagent
         -device virtserialport,chardev=vdagent0,name=com.redhat.spice.0
         -device virtio-rng-pci,rng=rng0
         -object rng-random,id=rng0,filename=/dev/urandom
         -monitor none
         -serial mon:stdio)

  # Add the disks
  # - https://turlucode.com/qemu-disk-io-performance-comparison-native-or-threads-windows-10-version/
  if [[ "${boot}" == *"efi"* ]]; then
    # shellcheck disable=SC2054
    args+=(-drive if=pflash,format=raw,file="${EFI_CODE}",readonly=on
           -drive if=pflash,format=raw,file="${EFI_VARS}")
  fi

  if [ -n "${floppy}" ]; then
    # shellcheck disable=SC2054
    args+=(-drive if=floppy,format=raw,file="${floppy}")
  fi

  if [ -n "${iso}" ]; then
    # shellcheck disable=SC2054
    args+=(-drive media=cdrom,index=0,file="${iso}")
  fi

  if [ -n "${fixed_iso}" ]; then
    # shellcheck disable=SC2054
    args+=(-drive media=cdrom,index=1,file="${fixed_iso}")
  fi

  if [ "${guest_os}" == "macos" ]; then
    # shellcheck disable=SC2054
    args+=(-device ahci,id=ahci
           -device ide-hd,bus=ahci.0,drive=BootLoader
           -drive id=BootLoader,if=none,format=qcow2,file="${MAC_BOOTLOADER}")

    if [ -n "${img}" ]; then
      # shellcheck disable=SC2054
      args+=(-device ide-hd,bus=ahci.1,drive=RecoveryImage
             -drive id=RecoveryImage,if=none,format=raw,file="${img}",cache=none,aio=native)
    fi

    # shellcheck disable=SC2054,SC2206
    args+=(-device ${MAC_DISK_DEV},drive=SystemDisk
           -drive id=SystemDisk,if=none,format=qcow2,file="${disk_img}",cache=none,aio=native ${STATUS_QUO})
  else
    # shellcheck disable=SC2054,SC2206
    args+=(-device virtio-blk-pci,drive=SystemDisk
           -drive id=SystemDisk,if=none,format=qcow2,file="${disk_img}",cache=none,aio=native ${STATUS_QUO}
           -device qemu-xhci,id=spicepass
           -chardev spicevmc,id=usbredirchardev1,name=usbredir
           -device usb-redir,chardev=usbredirchardev1,id=usbredirdev1
           -chardev spicevmc,id=usbredirchardev2,name=usbredir
           -device usb-redir,chardev=usbredirchardev2,id=usbredirdev2
           -chardev spicevmc,id=usbredirchardev3,name=usbredir
           -device usb-redir,chardev=usbredirchardev3,id=usbredirdev3
           -device usb-ccid
           -chardev spicevmc,id=ccid,name=smartcard
           -device ccid-card-passthru,chardev=ccid
           -device virtio-serial-pci
           -chardev spiceport,id=webdav0,name=org.spice-space.webdav.0
           -device virtserialport,chardev=webdav0,name=org.spice-space.webdav.0)
  fi

  # https://wiki.qemu.org/Documentation/9psetup
  # https://askubuntu.com/questions/772784/9p-libvirt-qemu-share-modes
  if [ "${guest_os}" != "windows" ]; then
      # shellcheck disable=SC2054
      args+=(-fsdev local,id=fsdev0,path="${PUBLIC}",security_model=mapped-xattr
             -device virtio-9p-pci,fsdev=fsdev0,mount_tag="${PUBLIC_TAG}")
  fi

  if [ -n "${USB_PASSTHROUGH}" ]; then
    # shellcheck disable=SC2054,SC2206
    args+=(-device ${USB_HOST_PASSTHROUGH_CONTROLLER},id=hostpass
          ${USB_PASSTHROUGH})
  fi

  # The OSK parameter contains parenthesis, they need to be escaped in the shell scripts
  # The vendor name, Wimpys World, contains a space. It needs to be double-quoted.
  SHELL_ARGS="${args[*]}"
  SHELL_ARGS="${SHELL_ARGS//(/\\(}"
  SHELL_ARGS="${SHELL_ARGS//)/\\)}"
  SHELL_ARGS="${SHELL_ARGS//Wimpys World/\"Wimpys World\"}"

  echo "#!/usr/bin/env bash" > "${VMDIR}/${VMNAME}.sh"
  echo "${QEMU}" "${SHELL_ARGS}" >> "${VMDIR}/${VMNAME}.sh"

  ${QEMU} "${args[@]}" > "${VMDIR}/${VMNAME}.log" &
  echo -e " - Process:  On guest: killall ${VMNAME}\t(if a forced kill is required)"

  # If output is 'none' then SPICE was requested.
  if [ ${OUTPUT} == "none" ]; then
    spicy --title "${VMNAME}" --port "${SPICE_PORT}" --spice-shared-dir "${PUBLIC}" "${FULLSPICY}" >/dev/null 2>&1 &
  fi
}

function shortcut_create {
  local VMNAME=""
  VMNAME=$(basename "${VM}" .conf)
  local LAUNCHER_DIR=""
  LAUNCHER_DIR="$(dirname "$(realpath "$0")")"
  local filename="${HOME}/.local/share/applications/${VMNAME}.desktop"
  cat << EOF > "${filename}"
[Desktop Entry]
Version=1.0
Type=Application
Terminal=true
Exec=${LAUNCHER_DIR}/${LAUNCHER} --vm ${VM}
Name=${VMNAME}
Icon=/usr/share/icons/hicolor/scalable/apps/qemu.svg
EOF
  echo "Created ${VMNAME}.desktop file"
}

function usage() {
  echo
  echo "Usage"
  echo "  ${LAUNCHER} --vm ubuntu.conf"
  echo
  echo "You can also pass optional parameters"
  echo "  --delete                : Delete the disk image."
  echo "  --display               : Select display backend. 'sdl' (default), 'gtk' or 'spice'"
  echo "  --shortcut              : Create a desktop shortcut"
  echo "  --snapshot apply <tag>  : Apply/restore a snapshot."
  echo "  --snapshot create <tag> : Create a snapshot."
  echo "  --snapshot delete <tag> : Delete a snapshot."
  echo "  --snapshot info         : Show disk/snapshot info."
  echo "  --status-quo            : Do not commit any changes to disk/snapshot."
  echo "  --fullscreen            : Starts VM in full screen mode (Ctl+Alt+f to exit)"
  echo "  --screen <screen>       : Use specified screen to determine the window size."
  echo "  --version               : Print version"
  exit 1
}

# Lowercase variables are used in the VM config file only
boot="efi"
cpu_cores=""
disk_img=""
disk_size="32G"
fixed_iso=""
floppy=""
guest_os="linux"
img=""
iso=""
macos_release=""
port_forwards=()
preallocation="metadata"
ram=""
usb_devices=()


DELETE=0
FULLSCREEN=""
FULLSPICY=""
OUTPUT="sdl"
PUBLIC=""
PUBLIC_PERMS=""
PUBLIC_TAG=""
SCREEN=""
SHORTCUT=0
SNAPSHOT_ACTION=""
SNAPSHOT_TAG=""
STATUS_QUO=""
USB_PASSTHROUGH=""
VM=""

readonly LAUNCHER=$(basename "${0}")
readonly DISK_MIN_SIZE=$((197632 * 8))
readonly VERSION="2.1.0"

# PUBLICSHARE is the only directory exposed to guest VMs for file
# sharing via 9P and spice-webdavd. This path is not configurable.
PUBLIC=$(xdg-user-dir PUBLICSHARE)
if [ "${PUBLIC}" != ${HOME} ]; then
  if [ ! -d "${PUBLIC}" ]; then
    mkdir -p "${PUBLIC}"
  fi
  PUBLIC_TAG=$(basename ${PUBLIC})-${USER,,}
  PUBLIC_PERMS=$(ls -ld ${PUBLIC} | cut -d' ' -f1)
else
  PUBLIC=""
fi

# TODO: Make this run the native architecture binary
QEMU=$(which qemu-system-x86_64)
QEMU_IMG=$(which qemu-img)
if [ ! -e "${QEMU}" ] && [ ! -e "${QEMU_IMG}" ]; then
  echo "ERROR! qemu not found. Please install qemu."
  exit 1
fi

QEMU_VER=$(${QEMU} -version | head -n1 | cut -d' ' -f4 | cut -d'(' -f1 | sed 's/\.//g' | cut -c1-2)
if [ "${QEMU_VER}" -lt 60 ]; then
  echo "ERROR! Qemu 6.0.0 or newer is required, detected $(${QEMU} -version | head -n1 | cut -d' ' -f4 | cut -d'(' -f1)."
  exit 1
fi

# Take command line arguments
if [ $# -lt 1 ]; then
    usage
    exit 0
else
    while [ $# -gt 0 ]; do
        case "${1}" in
          -delete|--delete)
            DELETE=1
            shift;;
          -display|--display)
            OUTPUT="${2}"
            if [ "${OUTPUT}" != "gtk" ] && [ "${OUTPUT}" != "sdl" ] && [ "${OUTPUT}" != "spice" ]; then
              echo "ERROR! Requested output '${OUTPUT}' is not recognised."
              exit 1
            elif [ "${OUTPUT}" == "spice" ] && [ ! "$(which spicy)" ]; then
              echo "ERROR! Requested SPICE display, but 'spicy' is not installed."
              exit 1
            fi
            shift
            shift;;
          -snapshot|--snapshot)
            SNAPSHOT_ACTION="${2}"
            if [ -z "${SNAPSHOT_ACTION}" ]; then
              echo "ERROR! No snapshot action provided."
              exit 1
            fi
            shift
            SNAPSHOT_TAG="${2}"
            if [ -z "${SNAPSHOT_TAG}" ] && [ "${SNAPSHOT_ACTION}" != "info" ]; then
              echo "ERROR! No snapshot tag provided."
              exit 1
            fi
            shift
            shift;;
          -status-quo|--status-quo)
            STATUS_QUO="-snapshot"
            shift;;
          -fullscreen|--fullscreen|-full-screen|--full-screen)
            FULLSCREEN="-full-screen"
            FULLSPICY="--full-screen"
            shift;;
          -vm|--vm)
            VM="${2}"
            shift
            shift;;
          -screen|--screen)
            SCREEN="${2}"
            shift
            shift;;
          -shortcut|--shortcut)
            SHORTCUT=1
            shift;;
          -version|--version)
            echo "${VERSION}"
            exit;;
          -h|--h|-help|--help)
            usage;;
          *)
            echo "ERROR! \"${1}\" is not a supported parameter."
            usage;;
        esac
    done
fi

if [ -n "${VM}" ] && [ -e "${VM}" ]; then
  # shellcheck source=/dev/null
  source "${VM}"
  if [ -z "${disk_img}" ]; then
    echo "ERROR! No disk_img defined."
    exit 1
  fi

  # Backwards compatibility for ${driver_iso}
  if [ -n "${driver_iso}" ] && [ -z "${fixed_iso}" ]; then
    fixed_iso="${driver_iso}"
  fi

  # Backwards compatibility for ${disk} (size)
  if [ -n "${disk}" ]; then
    disk_size="${disk}"
  fi
else
  echo "ERROR! Virtual machine configuration not found."
  usage
fi

if [ ${DELETE} -eq 1 ]; then
  disk_delete
  exit
fi

if [ -n "${SNAPSHOT_ACTION}" ]; then
  case ${SNAPSHOT_ACTION} in
    apply)
      snapshot_apply "${SNAPSHOT_TAG}"
      snapshot_info
      exit;;
    create)
      snapshot_create "${SNAPSHOT_TAG}"
      snapshot_info
      exit;;
    delete)
      snapshot_delete "${SNAPSHOT_TAG}"
      snapshot_info
      exit;;
    info)
      snapshot_info
      exit;;
    *)
      echo "ERROR! \"${SNAPSHOT_ACTION}\" is not a supported snapshot action."
      usage;;
  esac
fi

if [ ${SHORTCUT} -eq 1 ]; then
  shortcut_create
  exit
fi

vm_boot