#!/bin/sh

set -eu

umask 022

cd /srv/web/oob.foo.sh/routeros

verbose=false
if [ "${1:-}" = "-v" ]; then
    verbose=true
    shift
fi

if [ $# -gt 0 ]; then
    echo "Usage: $(basename "$0") [-v]" 1>&2
    exit 1
fi

packageinfo=$(curl -sSf "https://mikrotik.com/download" | awk -F '"' '
    {
      if (!url && $0 ~ /routeros-[0-9\.]+-arm.npk/) {
        url=$2
      } else if (!found && url && $0 ~ /data-checksum-sha256/) {
        print url " " $6
        found = 1
      }
    }
    ')

packageurl="$(echo "$packageinfo" | cut -d " " -f 1)"
checksum="$(echo "$packageinfo" | cut -d " " -f 2)"
if [ -z "$packageurl" ]; then
    echo "ERR: Got empty package URL, exiting" 1>&2
    exit 1
fi
packagename="$(basename "$packageurl")"
if [ -f "$packagename" ]; then
    "$verbose" && echo "Already up to date"
    exit 0
fi

if [ -z "$checksum" ]; then
    echo "ERR: Failed to determine package checksum" 1>&2
    exit 1
fi

echo "Downloading new package '${packagename}'"
tmpfile="$(mktemp -p .)"
trap 'rm -f -- "$tmpfile"' EXIT
curl -sSf -o "$tmpfile" "$packageurl"

if [ "$(sha256sum "$tmpfile" | cut -d " " -f 1)" != "$checksum" ]; then
    echo "ERR: Checksum check failed, not saving package" 1>&2
    exit 1
fi

mv "$tmpfile" "$packagename"

echo
curl -sSf "https://cdn.mikrotik.com/routeros/$(echo "$packagename" | cut -d "-" -f 2)/CHANGELOG"
echo
echo