#!/bin/sh
set -ef

[ $# -gt 0 ] || exit 1

if [ -z "${NGX_DEBUG:-}" ] ; then
	cat >&2 <<-EOF
	
	$0:
	NGX_DEBUG is not set - defaulting to NGX_DEBUG=0
	
	EOF
	NGX_DEBUG=0
fi

# ANGIE_MODULES_DIR=/usr/lib/angie/modules
d=/etc/angie/mod.dist

## produce package list
p=
for i ; do
	[ -n "$i" ] || continue
	p="$p${p:+ }angie-module-$i"
done

[ -n "$p" ] || exit 0

apt-install.sh $p

[ -d "$d" ] || install -d "$d"

list_ngx_modules() {
	set +e
	dpkg-query -L "$1" \
	| grep -F -e "${ANGIE_MODULES_DIR}/" \
	| grep -E -e '/[^/]+_module(-debug)?\.so$' \
	| sort -V \
	| xargs -r ls -U1d 2>/dev/null
	set -e
}

gen_mod_config() {
	if [ -s "$2" ] ; then
		printf '%s: configuration already exists: %s\n' "$1" "$2" >&2
		return
	fi

	[ -n "$3" ] || return

	for __m in $3 ; do
		echo "load_module ${__m};" >> "$2"
	done
}

for i ; do
	[ -n "$i" ] || continue

	p="angie-module-$i"

	## adjust modules:
	## - remove debug module if not in debug image
	## - move debug module to usual location otherwise
	while read -r fmod ; do
		case "${fmod}" in
		*-debug.so ) ;;
		* ) continue ;;
		esac

		if [ "${NGX_DEBUG}" = 0 ] ; then
			rm -fv "${fmod}"
		else
			fmod_nodebug="${fmod%-debug.so}.so"
			rm -fv "${fmod_nodebug}"
			mv -fv "${fmod}" "${fmod_nodebug}"
		fi
	done <<-EOF
	$(list_ngx_modules "$p")
	EOF

	if [ -e "$d/.$i.preseed" ] ; then
		printf '%s: skipping generation of attachable module configs\n' "$p" >&2
		continue
	fi

	## produce attachable module configs
	http_modules=
	mail_modules=
	stream_modules=
	while read -r fmod ; do
		fmod_short="modules.dist/${fmod#"${ANGIE_MODULES_DIR}/"}"
		fname=${fmod##*/}
		case "${fname}" in
		ngx_http_* )
			http_modules="${http_modules}${http_modules:+ }${fmod_short}"
		;;
		ngx_mail_* )
			mail_modules="${mail_modules}${mail_modules:+ }${fmod_short}"
		;;
		ngx_stream_* )
			stream_modules="${stream_modules}${stream_modules:+ }${fmod_short}"
		;;
		## damn NDK
		ndk_http_* )
			http_modules="${http_modules}${http_modules:+ }${fmod_short}"
		;;
		* )
			env printf '%s: unable to determine module type for file (skipping): %q\n' "$p" "${fmod}" >&2
			continue
		;;
		esac
	done <<-EOF
	$(list_ngx_modules "$p")
	EOF

	[ -z "${http_modules}" ]   || gen_mod_config "$p" "$d/http-$i.conf" "${http_modules}"
	[ -z "${mail_modules}" ]   || gen_mod_config "$p" "$d/mail-$i.conf" "${mail_modules}"
	[ -z "${stream_modules}" ] || gen_mod_config "$p" "$d/stream-$i.conf" "${stream_modules}"
done