#!/bin/sh

# shellcheck disable=SC2119,SC2120

# shellcheck source=../lib/load-configuration
. "${0%/*}/../lib/load-configuration"

if [ $# -eq 0 ]; then
  dummynator='sudo'
elif [ $# -eq 1 ] && [ "x$1" = 'x-n' ]; then
  dummynator='echo'
else
  >&2 echo 'usage: clean-cache [-n]'
  >&2 echo '  cleans /var/cache/archbuild32'
  >&2 echo '  (or prints what would be cleaned)'
  exit 1
fi

repos='build-support community-staging community-testing community core extra gnome-unstable kde-unstable staging testing'

mirror=$(
  grep -m1 '^Server = ' '/etc/pacman.d/mirrorlist32' | \
    cut -d= -f2 | \
    sed 's|^\s*||'
)

tmp_dir=$(mktemp -d 'tmp.clean-cache.XXXXXXXXXX' --tmpdir)
trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT

for repo in ${repos}; do
  mkdir "${tmp_dir}/${repo}"
  wget -qO - "$(
    # shellcheck disable=SC2016
    echo "${mirror}" | \
      sed "$(
        printf 's|%s|%s|\n' \
          '\$repo' "${repo}" \
          '\$arch' 'i686' \
          '$' "/${repo}.db.tar.gz"
      )"
  )" | \
    tar -xzC "${tmp_dir}/${repo}"
done

find "${tmp_dir}" -type f -name desc \
  -printf '%h ' \
  -exec grep -xFA1 '%SHA256SUM%' {} \; | \
  sed '
    N
    s|^.\+/\([^/]\+\) %SHA256SUM%\n\(.\+\)$|\2  /var/cache/archbuild32/\1|
  ' | \
  sort -k2,2 | \
  uniq -uf1 | \
  while read -r s; do
    printf '%s%s\n' \
      "${s}" '-i686.pkg.tar.xz' \
      "${s}" '-any.pkg.tar.xz'
  done | \
  sha256sum -c --ignore-missing --quiet 2> /dev/null | \
  sed 's|: FAILED$||' | \
  xargs -r ${dummynator} rm