#!/bin/sh
set -f

. /image-entry.d/00-common.envsh

## sanity check
t=$(mktemp) || exit 1

for n in mod snip ; do
	[ -d "${merged_root}/$n" ] || continue
	find "${merged_root}/$n/" ! -type d
done \
| grep -E "^${merged_root}/(mod|snip)/.+\.load\$" \
| sort -V > "$t"

if [ -s "$t" ] ; then
	log_always 'these files will be EXPLICITLY skipped:'
	log_file "$t"
fi
rm -f "$t" ; unset t

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

load_error_delim() {
	IEP_TRACE=0 log_always ' ----------------------------------- '
}
load_error() {
	[ "${load_error_seen:-}" != 1 ] || return
	load_error_seen=1
	load_error_delim
	log_always 'tree combine has failed'
	if [ "${NGX_STRICT_LOAD}" = 1 ] ; then
		t=15
		log_always "injecting delay for $t seconds"
		load_error_delim
		sleep $t
		exit 1
	fi
	load_error_delim
}

dirs='cache lib log'
for n in ${dirs} ; do
	s="/angie/$n"
	d="${target_root}/$n"

	if [ -d "$s" ] ; then
		ln_s "$s" "$d"
	else
		[ -d "$d" ] || install_userdir "$d"
	fi
done

## provide same symlinks as upstream (both Angie and nginx) docker images do
d="${target_root}/log"
[ -e "$d/access.log" ] || ln_s /dev/stdout "$d/access.log" || load_error
[ -e "$d/error.log" ]  || ln_s /dev/stderr "$d/error.log" || load_error

## NB: if any error occurs above then configuration is merely empty and/or broken

while read -r old_path ; do
	[ -n "${old_path}" ] || continue

	new_path=$(combine_remap_path "${old_path}")
	[ -n "${new_path}" ]

	new_dir="${new_path%/*}"
	[ -d "${new_dir}" ] || mkdir -p "${new_dir}"

	ln_cp "${old_path}" "${new_path}"
done <<-EOF
$(
	set +e
	for n in ${NGX_DIRS_MERGE} ; do
		[ -n "$n" ] || continue

		[ -d "${merged_root}/$n" ] || continue
		find "${merged_root}/$n/" ! -type d
	done \
	| grep -Ev \
	  -e "^${merged_root}/(mod|snip)/.+\.load\$" \
	  -e "^${merged_root}/mod/[^/]+\.preseed\$" \
	| sort -V
)
EOF

for n in ${NGX_DIRS_LINK} ; do
	[ -n "$n" ] || continue

	if [ -e "${target_root}/$n" ] ; then continue ; fi
	for d in "/angie/$n" "/etc/angie/$n" "/etc/angie/$n.dist" ; do
		[ -d "$d" ] || continue
		ln_s "$d" "${target_root}/$n"
		break
	done

	[ -d "${target_root}/$n" ] || {
		log "missing required directory: ${target_root}/$n"
	}
done

## Angie modules are loaded in [strict] order!
combine_modules() {
	[ -n "$1" ] || return 1
	n="$1" ; shift

	[ $# -ne 0 ] || return 0

	old_dir="${merged_root}/mod"
	new_dir="${target_root}/mod"

	i=0
	for m ; do
		[ -n "$m" ] || continue

		old_name="$n-$m.conf"
		old_path="${old_dir}/${old_name}"
		if ! [ -f "${old_path}" ] ; then
			log_always "file ${old_name} is not found in ${old_dir}/"
			load_error
			log "file ${old_name} is skipped"
			continue
		fi

		new_name=$(printf "%s-%02d-%s.load" "$n" "$i" "$m")
		new_path="${new_dir}/${new_name}"

		ln_cp "${old_path}" "${new_path}"

		i=$((i+1))
	done ; unset m
}

combine_snippets() {
	[ -n "$1" ] || return 1
	n="$1" ; shift

	[ $# -ne 0 ] || return 0

	old_dir="${merged_root}/snip"
	new_dir="${target_root}/snip"

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

		new_path="${new_dir}/$n-$s.load"
		if [ -e "${new_path}" ] ; then
			log "${new_path} already exists, skipping"
			continue
		fi

		old_name="$n-$s.conf"
		old_path="${old_dir}/${old_name}"
		if ! [ -f "${old_path}" ] ; then
			log_always "file ${old_name} is not found in ${old_dir}/"
			if [ "${NGX_ALLOW_MISSING_SNIPPETS:-}" != 1 ] ; then
				load_error
				log "file ${old_name} is skipped"
			fi
			continue
		fi

		ln_cp "${old_path}" "${new_path}"
	done ; unset s
}

combine_modules core   ${NGX_CORE_MODULES:-}
combine_modules http   ${NGX_HTTP_MODULES:-}
combine_modules mail   ${NGX_MAIL_MODULES:-}
combine_modules stream ${NGX_STREAM_MODULES:-}

unset NGX_ALLOW_MISSING_SNIPPETS

combine_snippets core    ${NGX_CORE_SNIPPETS:-}
combine_snippets core_ev ${NGX_CORE_EVENTS_SNIPPETS:-}
combine_snippets http    ${NGX_HTTP_SNIPPETS:-}
combine_snippets mail    ${NGX_MAIL_SNIPPETS:-}
combine_snippets stream  ${NGX_STREAM_SNIPPETS:-}

## some modules doesn't have configuration at all
NGX_ALLOW_MISSING_SNIPPETS=1

combine_snippets core   ${NGX_CORE_MODULES:-}
combine_snippets http   ${NGX_HTTP_MODULES:-}
combine_snippets mail   ${NGX_MAIL_MODULES:-}
combine_snippets stream ${NGX_STREAM_MODULES:-}

exit 0