#!/bin/sh
set -f

. /run/ngx/iep/00-common.envsh

## Angie: unset core variables
unset ANGIE ANGIE_BPF_MAPS

[ "${NGX_STRICT_LOAD}" = 0 ] || set -e

cd "${target_root}/"

expand_error_delim() {
	IEP_DEBUG=0 log_always ' ----------------------------------- '
}
unset expand_error_seen
expand_error() {
	[ "${expand_error_seen:-}" != 1 ] || return
	expand_error_seen=1
	expand_error_delim
	log_always 'template expansion has failed'
	if [ "${NGX_STRICT_LOAD}" = 1 ] ; then
		t=15
		log_always "injecting delay for $t seconds"
		expand_error_delim
		sleep $t
		exit 1
	fi
	expand_error_delim
}

[ "${NGX_STRICT_LOAD}" = 0 ] || set -e

unset ENVSUBST_ARGS
ENVSUBST_ARGS="${volume_root}/diag.envsubst.txt"
envsubst-args.sh > "${ENVSUBST_ARGS}"
export ENVSUBST_ARGS

## envsubst is simple and fast
envsubst-dirs j2cfg/ || expand_error

## j2cfg is more complex

unset J2CFG_CONFIG
set -a
J2CFG_PATH="${target_root}/j2cfg"
J2CFG_SEARCH_PATH="${target_root}"
set +a

## expand j2cfg/ first
j2cfg-dirs j2cfg/ || expand_error

## dump [merged] j2cfg config
j2cfg_dump="${volume_root}/diag.j2cfg.yml"
j2cfg-dump-yml > "${j2cfg_dump}" || expand_error
export J2CFG_CONFIG="${j2cfg_dump}"

## expand other directories
## NB: j2cfg/ and static/ are handled separately
merge_dirs=$(mktemp)
{
	set +e
	find ./ -follow -mindepth 1 -maxdepth 1 -type d -printf '%P/\0' \
	| grep -zFxv -e j2cfg/ -e static/ | sort -zuV
} > "${merge_dirs}"

xargs -0r -n 1000 -a "${merge_dirs}" \
envsubst-dirs < /dev/null || expand_error

xargs -0r -n 1000 -a "${merge_dirs}" \
j2cfg-dirs < /dev/null || expand_error

rm -f "${merge_dirs}" ; unset merge_dirs

## expand static/
## NB: template sources are removed unless IEP_DEBUG is set!
if [ "${NGX_HTTP_STATIC_TEMPLATE}" = 1 ] ; then

	template_list=$(mktemp)

	find static/ -follow -name '*.in' -type f -printf '%p\0' \
	| {
		set +e
		if [ -n "${NGX_STATIC_EXCLUDE_REGEX:-}" ] ; then
			grep -zEv -e "${NGX_STATIC_EXCLUDE_REGEX}"
		elif [ -n "${NGX_STATIC_INCLUDE_REGEX:-}" ] ; then
			grep -zE -e "${NGX_STATIC_INCLUDE_REGEX}"
		else
			cat
		fi
	} \
	| sort -zuV > "${template_list}"

	if [ -s "${template_list}" ] ; then
		xargs -0r -n 1000 -a "${template_list}" \
		envsubst-multi < /dev/null || expand_error
	fi

	find static/ -follow -name '*.j2' -type f -printf '%p\0' \
	| {
		set +e
		if [ -n "${NGX_STATIC_EXCLUDE_REGEX:-}" ] ; then
			grep -zEv -e "${NGX_STATIC_EXCLUDE_REGEX}"
		elif [ -n "${NGX_STATIC_INCLUDE_REGEX:-}" ] ; then
			grep -zE -e "${NGX_STATIC_INCLUDE_REGEX}"
		else
			cat
		fi
	} \
	| sort -zuV > "${template_list}"

	if [ -s "${template_list}" ] ; then
		xargs -0r -n 1000 -a "${template_list}" \
		j2cfg-multi < /dev/null || expand_error
	fi

	rm -f "${template_list}"
fi

exit 0