#!/bin/bash
#
# Contact:
#   Email: systemroles-owner@lists.fedorahosted.org
#   IRC/matrix: #systemroles - @all - irc.libera.chat

set -euo pipefail

AGE_IN_DAYS=${AGE_IN_DAYS:-183}
newest_date=$(date --date="${AGE_IN_DAYS} days ago" +%Y%m%d)

function normalize_image_name() {
  if [[ "${1:-}" =~ ^(RHEL-[[:digit:]]+\.[[:digit:]]+)[.-]([[:alnum:]._-]+)?$ ]]; then
    echo "${BASH_REMATCH[1]}"
  else
    echo "${1:-}"
  fi
}

if [ -z "${1:-}" ]; then
  echo "Need a directory to pushd in" >&2
  exit 1
fi

pushd "${1}"

find -maxdepth 1 -type d | while read dir; do
  # Case: linux-system-roles-certificate-pull-linux-system-roles_certificate-80-4f880f7-rhel-x-20210305-152227
  if [[ "${dir}" =~ ^./linux-system-roles-[[:alnum:]._-]+-pull-linux-system-roles_([[:alnum:]._-]+)-[[:digit:]]+-([[:xdigit:]]+|HEAD)-([[:alnum:]._-]+)-([[:digit:]]+)-([[:digit:]]+)$ ]]; then
    echo "${BASH_REMATCH[1]}" "$(normalize_image_name "${BASH_REMATCH[3]}")" "${BASH_REMATCH[4]}" "${BASH_REMATCH[5]}" "${dir}"
  # Case: lsr-citool_bootloader-19-0f14842_20220104-080416
  elif [[ "${dir}" =~ ^./lsr-citool_([[:alnum:]._-]+)-[[:digit:]]+-([[:xdigit:]]+|HEAD)_([[:digit:]]+)-([[:digit:]]+)$ ]]; then
    echo "${BASH_REMATCH[1]}" "unknown" "${BASH_REMATCH[3]}" "${BASH_REMATCH[4]}" "${dir}"
  # Case: lsr-citool_certificate-132-212741b_RHEL-9.1.0-20220814.1_20220818-223408
  elif [[ "${dir}" =~ ^./lsr-citool_([[:alnum:]._-]+)-[[:digit:]]+-([[:xdigit:]]+|HEAD)_([[:alnum:]._-]+)_([[:digit:]]+)-([[:digit:]]+)$ ]]; then
    echo "${BASH_REMATCH[1]}" "$(normalize_image_name "${BASH_REMATCH[3]}")" "${BASH_REMATCH[4]}" "${BASH_REMATCH[5]}" "${dir}"
  # Case: lsr-citool_network-509-82dd06b_RHEL-6.10-updates-20201110.17
  elif [[ "${dir}" =~ ^./lsr-citool_([[:alnum:]._-]+)-[[:digit:]]+-([[:xdigit:]]+|HEAD)_([[:alnum:]._-]+)$ ]]; then
    tmod="$(stat -c %Y "${dir}")"
    tmod="$(date --date="@${tmod}" +'%Y%m%d %H%M%S')"
    echo "${BASH_REMATCH[1]}" "$(normalize_image_name "${BASH_REMATCH[3]}")" "${tmod}" "${dir}"
  # Case: lsr-citool_* (artifacts of early lsr-citool development)
  elif [[ "${dir}" =~ ^./lsr-citool_.*$ ]]; then
    tmod="$(stat -c %Y "${dir}")"
    tmod="$(date --date="@${tmod}" +'%Y%m%d %H%M%S')"
    echo unknown unknown "${tmod}" "${dir}"
  fi
done | sort -n -r | while read role image date time dir; do
  # `sort -n -r` ensures that the most recent log for $role $image is on the top
  if [[ "${role}" = unknown && "${date}" -lt "${newest_date}" ]]; then
    # Let not artifacts of early stage of lsr-citool development to rot forever
    rm -rf "${dir}"
    continue
  fi
  latest_file=".latest_${role}_${image}"
  if [[ -f "${latest_file}" ]]; then
    # Latest log for $role $image seen already
    if [[ "${date}" -lt "${newest_date}" ]]; then
      rm -rf "${dir}"
    fi
  else
    echo keeping ${role} ${image} ${date} ${time} ${dir}
    echo "${dir}" > "${latest_file}"
  fi
done
rm -rf .latest_*

popd