#!/bin/sh

set -e

CACHE_DOMAINS_DIR="/var/cache-domains"
CACHE_DOMAINS_SRC="https://api.github.com/repos/uklans/cache-domains/tarball/master"
CONFIG_FILE="/etc/cache-domains.json"

configure() {
	mkdir -p "${CACHE_DOMAINS_DIR}"
	rm -fr "${CACHE_DOMAINS_DIR:?}/"*

	if ! wget -qO - "${CACHE_DOMAINS_SRC}" | tar -xzC "${CACHE_DOMAINS_DIR}"; then
		rm -fr "${CACHE_DOMAINS_DIR}"
		echo "ERROR: Could not retrieve ${CACHE_DOMAINS_SRC}"
		exit 1
	fi

	INITIAL_DIR="$(pwd)"
	cd "${CACHE_DOMAINS_DIR}/"*"/scripts/"

	if [ ! -f "${CONFIG_FILE}" ]; then
		cp "config.example.json" "${CONFIG_FILE}"
		echo "Using example config file ${CONFIG_FILE}"
	fi

	cp "${CONFIG_FILE}" "config.json"
	./create-dnsmasq.sh
	cp "./output/dnsmasq/"* "/var/dnsmasq.d/"

	cd "${INITIAL_DIR}"

	/etc/init.d/dnsmasq restart
}

cleanup() {
	# leave dnsmasq in a clean state
	for FILE in "${CACHE_DOMAINS_DIR}/"*"/scripts/output/dnsmasq/"*; do
		rm -f "/tmp/dnsmasq.d/$(basename "${FILE}")"
	done

	/etc/init.d/dnsmasq restart
}

case ${1} in
	config*)
		configure
		;;
	clean*)
		cleanup
		;;
	*)
		echo "${0} <configure|cleanup>"
		;;
esac