#!/bin/sh

volume_root='/run/ngx'
target_root="${volume_root}/conf"
persist_dirs='cache lib log'
empty_dir='/var/lib/empty'

## unexporting variable in (POSIX) sh is PITA =/
# have_envvar() {
# 	[ -n "$1" ] || return 1
# 	grep -Ezq "^$1=" /proc/$$/environ || return
# }
# unexport() {
# 	local ___k ___v
# 	for ___k ; do
# 		[ -n "${___k}" ] || continue
# 		have_envvar "${___k}" || continue

# 		___v=$(eval printf '%s' "\"\${${___k}}\"")
# 		eval "unset ${___k}"
# 		eval "${___k}=$(env printf '%s' \"\${___v}\")"
# 	done
# }

## likely the same as in https://pkg.go.dev/strconv#ParseBool
gobool_to_int() {
	## local value=$1
	## local default=$2
	case "${1:-_}" in
	1 | [Tt] | [Tt][Rr][Uu][Ee] )     echo 1 ;;
	0 | [Ff] | [Ff][Aa][Ll][Ss][Ee] ) echo 0 ;;
	* ) echo "${2:-error}" ;;
	esac
}

[ -n "${__IEP_SRC:-}" ] || __IEP_SRC="$0"

log_always() {
	if [ "${IEP_DEBUG}" = 1 ] ; then
		echo "# $(date +'%Y-%m-%d %H:%M:%S.%03N %z'): ${__IEP_SRC}${*:+: $*}"
	else
		echo "# ${__IEP_SRC}${*:+: $*}"
	fi >&2
}

log() {
	[ "${IEP_VERBOSE}" = 0 ] || log_always "$@"
}

ln_s() {
	if [ "${IEP_VERBOSE}" = 0 ] ; then
		ln -s "$@" || return
	else
		ln -sv "$@" || return
	fi
}
cp_a() {
	if [ "${IEP_VERBOSE}" = 0 ] ; then
		cp -a "$@" || return
	else
		cp -av "$@" || return
	fi
}

ln_cp() {
	if [ -h "$1" ] ; then
		ln_s "$(readlink -e "$1")" "$2"
	else
		cp_a "$1" "$2"
	fi
}

have_cmd() { command -v "$1" >/dev/null 2>&1 || return ; }

strip_suffix() { printf '%s' "${1%"$2"}" | tr -s '/' ; }

user_install() {
	if [ "${IEP_ROOT}" = 1 ] ; then
		install -o "${NGX_USER}" -g "${NGX_GROUP}" "$@"
	else
		install "$@"
	fi
}

is_builtin_module() {
	[ -n "${1:-}" ] || return 1
	[ -n "${2:-}" ] || return 1

	[ -f "/etc/angie.dist/builtin.$1" ] || return 1
	[ -s "/etc/angie.dist/builtin.$1" ] || return 1

	grep -Fxq -e "$2" "/etc/angie.dist/builtin.$1" || return 1
}

append_list() {
	if [ -n "$2" ] ; then
		printf '%s' "${1:-}${1:+ }$2"
	else
		printf '%s' "$1"
	fi
}

prepend_list() {
	if [ -n "$2" ] ; then
		printf '%s' "$2${1:+ }${1:-}"
	else
		printf '%s' "$1"
	fi
}

list_have_item() {
	[ -n "$1" ] || return 1
	[ -n "$2" ] || return 1
	case " $1 " in
	*" $2 "* ) return 0 ;;
	esac
	return 1
}

normalize_list() {
	[ -n "$1" ] || return 0

	printf '%s' "$1" \
	| sed -zE 's/[[:space:]]+/ /g;s/^ //;s/ $//'
}

sort_dedup_list() {
	[ -n "$1" ] || return 0

	printf '%s' "$1" \
	| tr -s '[:space:]' '\n' | sort -uV \
	| sed -zE 's/[[:space:]]+/ /g;s/^ //;s/ $//'
}

float_div() {
	mawk -v "a=$1" -v "b=$2" 'BEGIN{print a/b;exit;}' </dev/null
}

find_fast() {
	find "$@" -printf . -quit | grep -Fq .
}

randN() {
	od -v -A n -t x1 -N "$1" < /dev/urandom | tr -d '[:space:]'
}

re_ipv4_oct='[0-9]|[1-9][0-9]|[1-9][0-9][0-9]|2[0-4][0-9]|25[0-5]'
re_ipv4_addr="^${re_ipv4_oct}\.${re_ipv4_oct}\.${re_ipv4_oct}\.${re_ipv4_oct}\$"
is_ipv4_address() {
	[ -n "$1" ] || return 1
	printf '%s' "$1" | grep -zEq "${re_ipv4_addr}" || return 1
}