#!/bin/sh

DAEMON=/usr/bin/tera-api
PIDFILE=/run/tera-api.pid
ENVFILE=/etc/tera/tera-api.env
RUN_AS=tera:tera

ensure_account() {
	if ! grep -q '^tera:' /etc/group; then
		addgroup -S tera || return 1
	fi
	if ! id tera >/dev/null 2>&1; then
		adduser -S -D -H -s /bin/false -G tera tera || return 1
	fi
}

prepare_runtime() {
	ensure_account || return 1
	mkdir -p /run/tera-api /var/lib/tera-api /var/log/tera || return 1
	chown tera:tera /run/tera-api || return 1
	chown -R tera:tera /var/lib/tera-api /var/log/tera || return 1
	chmod 0750 /run/tera-api /var/lib/tera-api /var/log/tera || return 1
}

load_environment() {
	if [ -r "$ENVFILE" ]; then
		set -a
		. "$ENVFILE"
		set +a
	fi
}

is_running() {
	[ -r "$PIDFILE" ] || return 1
	pid="$(cat "$PIDFILE" 2>/dev/null)"
	[ -n "$pid" ] && kill -0 "$pid" 2>/dev/null
}

wait_for_socket() {
	socket_path=$1
	attempts=0
	while [ "$attempts" -lt 30 ]; do
		[ -S "$socket_path" ] && return 0
		attempts=$((attempts + 1))
		sleep 1
	done
	return 1
}

start_service() {
	if is_running; then
		echo "tera-api is already running"
		return 0
	fi
	rm -f "$PIDFILE"
	[ -x "$DAEMON" ] || { echo "missing $DAEMON" >&2; return 1; }
	prepare_runtime || return 1
	load_environment
	if [ -n "${TERA_API_LOG_SOCKET:-}" ]; then
		wait_for_socket "$TERA_API_LOG_SOCKET" || {
			echo "tera-api dependency socket is not ready: $TERA_API_LOG_SOCKET" >&2
			return 1
		}
	fi
	start-stop-daemon -S -q -b -m -p "$PIDFILE" -c "$RUN_AS" -x "$DAEMON"
}

stop_service() {
	if ! is_running; then
		rm -f "$PIDFILE"
		return 0
	fi
	start-stop-daemon -K -q -p "$PIDFILE" -x "$DAEMON"
	rm -f "$PIDFILE"
}

case "$1" in
	start) start_service ;;
	stop) stop_service ;;
	restart) stop_service && start_service ;;
	status) is_running ;;
	*) echo "Usage: $0 {start|stop|restart|status}" >&2; exit 1 ;;
esac