post_install() {
  THEME_NAME="melawy-nier-a2"

  if [ -f "/etc/refind-menu-generator/theme.conf" ]; then
    echo "$THEME_NAME" > "/etc/refind-menu-generator/theme.conf"
  fi

  echo "Searching rEFInd installation in EFI partition..."
  if ! __has_esp__; then
    echo "EFI partition not found" >&2
    exit 1
  fi

  REFIND_DIR=$(find "$ESP" -type d -iname refind)
  if ! [[ -d "${REFIND_DIR}" ]]; then
    echo "rEFInd not installed in $ESP" >&2
    exit 1
  fi
  echo "Found rEFInd in ${REFIND_DIR}"

  EFI_BOOT_DIR=$(find "$ESP" -type d -iname boot)
  if ! [[ -d "${EFI_BOOT_DIR}" ]]; then
    EFI_BOOT_DIR=$(find "$ESP" -type d -iname Boot)
    if ! [[ -d "${EFI_BOOT_DIR}" ]]; then
      EFI_BOOT_DIR=$(find "$ESP" -type d -iname BOOT)
      if ! [[ -d "${EFI_BOOT_DIR}" ]]; then
        mkdir -p "$(dirname ${REFIND_DIR})/boot"
        EFI_BOOT_DIR="$(dirname ${REFIND_DIR})/boot"
      fi
    fi
  fi

  REFIND_CONF_PATH="${REFIND_DIR}/refind.conf"

  RESULT=$(grep "theme" $REFIND_CONF_PATH)

  if [[ "$?" = "0" ]]; then
    CURRENT_THEME=$(echo $RESULT | cut -d"/" -f2)
    if [[ "$?" = "0" ]]; then
      sed -e "s/$CURRENT_THEME/$THEME_NAME/g" -i $REFIND_CONF_PATH
    fi
  else
    if [[ -z "$(tail -n 1 -c 1 $REFIND_CONF_PATH)" ]];then
      echo "include themes/$THEME_NAME/theme.conf" >> $REFIND_CONF_PATH
    else
      echo -e "\ninclude themes/$THEME_NAME/theme.conf" >> $REFIND_CONF_PATH
    fi
  fi

  cp -vf "${REFIND_DIR}/refind.conf" "${EFI_BOOT_DIR}/refind.conf"
}

post_upgrade() {
  post_install
}

post_remove() {
  THEME_NAME="melawy-nier-a2"

  if [ -f "/etc/refind-menu-generator/theme.conf" ]; then
    echo "" > "/etc/refind-menu-generator/theme.conf"
  fi

  echo "Removal of theme from EFI partition"

  echo "Searching rEFInd installation in EFI partition..."
  if ! __has_esp__; then
    echo "EFI partition not found" >&2
    exit 1
  fi

  REFIND_DIR=$(find "$ESP" -type d -iname refind)
  if ! [[ -d "${REFIND_DIR}" ]]; then
    echo "rEFInd not installed in $ESP" >&2
    exit 1
  fi
  echo "Found rEFInd in ${REFIND_DIR}"

  EFI_BOOT_DIR=$(find "$ESP" -type d -iname boot)
  if ! [[ -d "${EFI_BOOT_DIR}" ]]; then
    EFI_BOOT_DIR=$(find "$ESP" -type d -iname Boot)
    if ! [[ -d "${EFI_BOOT_DIR}" ]]; then
      EFI_BOOT_DIR=$(find "$ESP" -type d -iname BOOT)
      if ! [[ -d "${EFI_BOOT_DIR}" ]]; then
        mkdir -p "$(dirname ${REFIND_DIR})/boot"
        EFI_BOOT_DIR="$(dirname ${REFIND_DIR})/boot"
      fi
    fi
  fi

  REFIND_CONF_PATH="${REFIND_DIR}/refind.conf"
  sed -i "/$THEME_NAME/d" $REFIND_CONF_PATH

  cp -vf "${REFIND_DIR}/refind.conf" "${EFI_BOOT_DIR}/refind.conf"
}

# Copied from https://raw.githubusercontent.com/jaltuna/refind-theme-nord/main/setup.sh
# Verify EFI System Partition
__has_esp__() {
  __find_esp__

  mount "$ESP" &>/dev/null
  [[ -d "$ESP/EFI" ]] && return 0 || return 1
}

__find_esp__() {
  local parttype
  local fstype
  local device

  while read -r device; do
    read -r parttype fstype ESP <<<"$(lsblk -o "PARTTYPE,FSTYPE,MOUNTPOINT" "$device" 2>/dev/null | awk 'NR==2')"

    [[ "${parttype,,}" != "c12a7328-f81f-11d2-ba4b-00a0c93ec93b" ]] && continue
    [[ "${fstype,,}" != "vfat" ]] && continue
    [[ -z $(findmnt -sn "$ESP") ]] && continue

  done <<<"$(fdisk -l 2>/dev/null | grep -i efi | cut -d " " -f 1)"

  if [ -z "${ESP}" ]; then
    ESP=$(grep -i "/efi" /etc/fstab | awk '{print $2}')
    if [ -z "${ESP}" ]; then
      ESP=$(grep -i "/boot" /etc/fstab | awk '{print $2}')
      if [ -z "${ESP}" ]; then
        ESP=$(bootctl --print-esp-path)
        if [ -z "${ESP}" ]; then
          exit 1
        fi
      fi
    fi
  fi

  echo "Found ${ESP}"
  readonly ESP
}