#!/bin/sh
# CDN Cache Offline Mode - Auto-detect WAN connectivity
# Enables offline mode (serve stale) when WAN goes down
# Disables offline mode when WAN comes back up

# Only handle WAN interface events
[ "$INTERFACE" = "wan" ] || [ "$INTERFACE" = "wan6" ] || exit 0

# Check if API failover is enabled
api_enabled=$(uci -q get cdn-cache.api_failover.enabled)
[ "$api_enabled" = "1" ] || exit 0

case "$ACTION" in
	ifdown)
		# WAN went down - enable offline mode
		logger -t cdn-cache "WAN down ($INTERFACE) - enabling offline mode"
		uci set cdn-cache.api_failover.offline_mode='1'
		uci commit cdn-cache

		# Reload Squid to apply offline mode
		if [ -x /etc/init.d/cdn-cache ]; then
			/etc/init.d/cdn-cache reload 2>/dev/null &
		fi
		;;

	ifup)
		# WAN came back up - disable offline mode
		logger -t cdn-cache "WAN up ($INTERFACE) - disabling offline mode"
		uci set cdn-cache.api_failover.offline_mode='0'
		uci commit cdn-cache

		# Reload Squid to disable offline mode
		if [ -x /etc/init.d/cdn-cache ]; then
			/etc/init.d/cdn-cache reload 2>/dev/null &
		fi
		;;
esac

exit 0