#!/bin/sh

set -e

cache_dir='/srv/arch-mirror/sources.archlinux32'

mkdir -p "${cache_dir}"

grep '^[^#]' "$(dirname "$0")/downloads.list" | \
  while read -r url; do
    if echo "${url}" | \
      grep -q '\*[^/]*$'; then
      urlDir=$(
        printf '%s\n' "${url}" | \
          sed 's|/[^/]*$|/|'
      )
      urlFile=$(
        printf '%s\n' "${url}" | \
          sed '
            s|^.*/||
            s|\.|\.|g
            s|*|.*|g
          '
      )
      wget -O - "${urlDir}" 2> /dev/null | \
        tr '"<>' '\n' | \
        grep "^${urlFile}\$" | \
        sort -u | \
        xargs -r printf "${urlDir}%s\n"
    else
      printf '%s\n' "${url}"
    fi
  done | \
  while read -r url; do
    if ! wget -O "${cache_dir}/tmp" "${url}" 2> /dev/null; then
      continue
    fi
    sum512="$(
      sha512sum "${cache_dir}/tmp" | \
        cut -d' ' -f1
    )"
    sum256="$(
      sha256sum "${cache_dir}/tmp" | \
        cut -d' ' -f1
    )"
    if [ ! -f "${cache_dir}/${sum512}" ]; then
      mv "${cache_dir}/tmp" "${cache_dir}/${sum512}"
    else
      rm "${cache_dir}/tmp"
    fi
    if [ ! -f "${cache_dir}/${sum256}" ]; then
      ln "${cache_dir}/${sum512}" "${cache_dir}/${sum256}"
    fi
  done