#!/bin/sh
set -o errexit

DOWNLOADS_DIRECTORY='/home/jeux/incoming'

download_games_generic() {
# Ignore ShellCheck warning about `local` being undefined in POSIX
# shellcheck disable=SC3043
local directory downloader options
directory="$1"
downloader="$2"
options="$3"
(
cd "$directory"
# Ignore ShellCheck warning about `$options` word splitting
# shellcheck disable=SC2086
$downloader $options
)
return 0
}

error_during_download() {
# Ignore ShellCheck warning about `local` being undefined in POSIX
# shellcheck disable=SC3043
local origin
origin="$1"
printf 'Error when trying to download updated games from %s\n' "$origin"
return 0
}

count_pending_updates_gog() {
printf 'Checking GOG account for pending updates…\n' 1>&2
lgogdownloader --updated --list 2>/dev/null | wc --lines
printf 'Done!\n' 1>&2
return 0
}

has_pending_updates_gog() {
test "$(count_pending_updates_gog)" -gt 0
}

download_gog_games() {
download_games_generic \
"${DOWNLOADS_DIRECTORY}/gog.com" \
'lgogdownloader' \
'--updated --download --include i,d --progress-interval 10000'
return 0
}

if has_pending_updates_gog; then
download_gog_games || \
error_during_download 'gog.com'
fi

exit 0