#!/bin/sh /etc/rc.common
# Copyright (c) 2015-2021 Dirk Brenken (dev@brenken.org)
# This is free software, licensed under the GNU General Public License v3.

# set (s)hellcheck exceptions
# shellcheck disable=1091,2010,2016,2034,2039,2059,2086,2091,2129,2143,2154,2181,2183,2188

START=30
USE_PROCD=1

if [ -n "$(type -t extra_command)" ]
then
	extra_command "suspend" "Suspend adblock processing"
	extra_command "resume" "Resume adblock processing"
	extra_command "query" "<domain> Query active blocklists and backups for a specific domain"
	extra_command "report" "[<search>] Print DNS statistics with an optional search parameter"
	extra_command "list" "[<add>|<add_sha>|<add_utc>|<add_eng>|<add_stb>|<remove>|<remove_sha>|<remove_utc>|<remove_eng>|<remove_stb>] <source(s)> List/Edit available sources"
	extra_command "timer" "[<add> <tasks> <hour> [<minute>] [<weekday>]]|[<remove> <line no.>] List/Edit cron update intervals"
	extra_command "version" "Print version information"
else
	EXTRA_COMMANDS="status suspend resume query report list timer version"
	EXTRA_HELP="	status	Service status
	suspend	Suspend adblock processing
	resume	Resume adblock processing
	query	<domain> Query active blocklists and backups for a specific domain
	report	[<search>] Print DNS statistics with an optional search parameter
	list	[<add>|<add_sha>|<add_utc>|<add_eng>|<add_stb>|<remove>|<remove_sha>|<remove_utc>|<remove_eng>|<remove_stb>] <source(s)> List/Edit available sources
	timer	[<add> <tasks> <hour> [<minute>] [<weekday>]]|[<remove> <line no.>] List/Edit cron update intervals
	version	Print version information"
fi

adb_init="/etc/init.d/adblock"
adb_script="/usr/bin/adblock.sh"
adb_pidfile="/var/run/adblock.pid"

if [ -s "${adb_pidfile}" ] && { [ "${action}" = "start" ] || [ "${action}" = "stop" ] || \
	[ "${action}" = "restart" ] || [ "${action}" = "reload" ] || [ "${action}" = "report" ] || \
	[ "${action}" = "suspend" ] || [ "${action}" = "resume" ] || [ "${action}" = "query" ] || \
	{ [ "${action}" = "list" ] && [ -n "${1}" ]; }; }
then
	exit 0
fi

version()
{
	rc_procd "${adb_script}" version
}

boot()
{
	[ -s "${adb_pidfile}" ] && > "${adb_pidfile}"
	rc_procd start_service
}

start_service()
{
	if [ "$("${adb_init}" enabled; printf "%u" ${?})" -eq 0 ]
	then
		if [ "${action}" = "boot" ]
		then
			if [ -n "$(uci_get adblock global adb_trigger)" ]
			then
				return 0
			fi
		fi
		procd_open_instance "adblock"
		procd_set_param command "${adb_script}" "${@}"
		procd_set_param pidfile "${adb_pidfile}"
		procd_set_param nice "$(uci_get adblock global adb_nice "0")"
		procd_set_param stdout 1
		procd_set_param stderr 1
		procd_close_instance
	fi
}

reload_service()
{
	rc_procd start_service reload
}

stop_service()
{
	rc_procd "${adb_script}" stop
}

restart()
{
	rc_procd start_service restart
}

suspend()
{
	rc_procd start_service suspend
}

resume()
{
	rc_procd start_service resume
}

query()
{
	rc_procd "${adb_script}" query "${1}"
}

report()
{
	rc_procd "${adb_script}" report "${1:-"+"}" "${2:-"50"}" "${3:-"true"}" "${4:-"cli"}"
}

list()
{
	local src_archive src_file src_enabled enabled name sha_list utc_list action="${1}"

	if [ "${action%_*}" = "add" ] || [ "${action%_*}" = "remove" ]
	then
		shift
		for name in "${@}"
		do
			case "${action}" in
				"add")
					if [ -z "$(uci_get adblock global adb_sources | grep -Fo "${name}")" ]
					then
						uci_add_list adblock global adb_sources "${name}"
						printf "%s\n" "::: adblock source '${name}' added to config"
					fi
				;;
				"remove")
					if [ -n "$(uci_get adblock global adb_sources | grep -Fo "${name}")" ]
					then
						uci_remove_list adblock global adb_sources "${name}"
						printf "%s\n" "::: adblock source '${name}' removed from config"
					fi
				;;
				"add_sha")
					if [ -z "$(uci_get adblock global adb_sha_sources | grep -Fo "${name}")" ]
					then
						uci_add_list adblock global adb_sha_sources "${name}"
						printf "%s\n" "::: adblock shallalist '${name}' added to config"
					fi
				;;
				"remove_sha")
					if [ -n "$(uci_get adblock global adb_sha_sources | grep -Fo "${name}")" ]
					then
						uci_remove_list adblock global adb_sha_sources "${name}"
						printf "%s\n" "::: adblock shallalist '${name}' removed from config"
					fi
				;;
				"add_utc")
					if [ -z "$(uci_get adblock global adb_utc_sources | grep -Fo "${name}")" ]
					then
						uci_add_list adblock global adb_utc_sources "${name}"
						printf "%s\n" "::: adblock utcapitole '${name}' added to config"
					fi
				;;
				"remove_utc")
					if [ -n "$(uci_get adblock global adb_utc_sources | grep -Fo "${name}")" ]
					then
						uci_remove_list adblock global adb_utc_sources "${name}"
						printf "%s\n" "::: adblock utcapitole '${name}' removed from config"
					fi
				;;
				"add_eng")
					if [ -z "$(uci_get adblock global adb_eng_sources | grep -Fo "${name}")" ]
					then
						uci_add_list adblock global adb_eng_sources "${name}"
						printf "%s\n" "::: adblock energized '${name}' added to config"
					fi
				;;
				"remove_eng")
					if [ -n "$(uci_get adblock global adb_eng_sources | grep -Fo "${name}")" ]
					then
						uci_remove_list adblock global adb_eng_sources "${name}"
						printf "%s\n" "::: adblock energized '${name}' removed from config"
					fi
				;;
				"add_stb")
					if [ -z "$(uci_get adblock global adb_stb_sources | grep -Fo "${name}")" ]
					then
						uci_add_list adblock global adb_stb_sources "${name}"
						printf "%s\n" "::: adblock stevenblack '${name}' added to config"
					fi
				;;
				"remove_stb")
					if [ -n "$(uci_get adblock global adb_stb_sources | grep -Fo "${name}")" ]
					then
						uci_remove_list adblock global adb_stb_sources "${name}"
						printf "%s\n" "::: adblock stevenblack '${name}' removed from config"
					fi
				;;
			esac
		done
		if [ -n "$(uci -q changes adblock)" ]
		then
			uci_commit adblock
			"${adb_init}" start
		fi
	else
		src_archive="$(uci_get adblock global adb_srcarc "/etc/adblock/adblock.sources.gz")"
		src_file="$(uci_get adblock global adb_srcfile "/tmp/adb_sources.json")"
		src_enabled="$(uci -q show adblock.global.adb_sources)"
		if [ -r "${src_archive}" ]
		then
			zcat "${src_archive}" > "${src_file}"
		else
			printf "%s\n" "::: adblock source archive '${src_archive}' not found"
		fi
		if [ -r "${src_file}" ]
		then
			src_enabled="${src_enabled#*=}"
			src_enabled="${src_enabled//\'}"
			printf "%s\n" "::: Available adblock sources"
			printf "%s\n" ":::"
			printf "%-25s%-10s%-7s%-21s%s\n" "    Name" "Enabled" "Size" "Focus" "Info URL"
			printf "%s\n" "    -------------------------------------------------------------------"
			json_load_file "${src_file}"
			json_get_keys keylist
			for key in ${keylist}
			do
				json_select "${key}"
				json_get_var size "size"
				json_get_var focus "focus"
				json_get_var descurl "descurl"
				json_get_var url "url"
				json_get_var rule "rule"
				if [ -n "${url}" ] && [ -n "${rule}" ]
				then
					if [ -n "$(printf "%s" "${src_enabled}" | grep -Fo "${key}")" ]
					then
						enabled="x"
					else
						enabled=" "
					fi
					src_enabled="${src_enabled/${key}}"
					printf "  + %-21s%-10s%-7s%-21s%s\n" "${key:0:20}" "${enabled}" "${size:0:3}" "${focus:0:20}" "${descurl:0:50}"
				else
					src_enabled="${src_enabled} ${key}"
				fi
				json_select ..
			done
			sha_list="$(uci_get adblock global adb_sha_sources "-")"
			utc_list="$(uci_get adblock global adb_utc_sources "-")"
			eng_list="$(uci_get adblock global adb_eng_sources "-")"
			stb_list="$(uci_get adblock global adb_stb_sources "-")"
			printf "%s\n" "    ---------------------------------------------------------------------------"
			printf "  * %s\n" "Configured shallalist categories: ${sha_list// /, }"
			printf "  * %s\n" "Configured utcapitole categories: ${utc_list// /, }"
			printf "  * %s\n" "Configured energized variants: ${eng_list// /, }"
			printf "  * %s\n" "Configured stevenblack variants: ${stb_list// /, }"

			if [ -n "${src_enabled// }" ]
			then
				printf "%s\n" "    ---------------------------------------------------------------------------"
				printf "%s\n" "    Sources without valid configuration"
				printf "%s\n" "    ---------------------------------------------------------------------------"
				for key in ${src_enabled}
				do
					printf "  - %s\n" "${key:0:20}"
				done
			fi
		else
			printf "%s\n" "::: adblock source file '${src_file}' not found"
		fi
	fi
}

status()
{
	status_service
}

status_service()
{
	local key keylist value idxval values rtfile

	rtfile="$(uci_get adblock global adb_rtfile "/tmp/adb_runtime.json")"

	json_load_file "${rtfile}" >/dev/null 2>&1
	json_get_keys keylist
	if [ -n "${keylist}" ]
	then
		printf "%s\n" "::: adblock runtime information"
		for key in ${keylist}
		do
			json_get_var value "${key}" >/dev/null 2>&1
			if [ "${key%_*}" = "active" ]
			then
				printf "  + %-15s : " "${key}"
				json_select "${key}" >/dev/null 2>&1
				values=""
				index=1
				while json_get_type type "${index}" && [ "${type}" = "object" ]
				do
					json_get_values idxval "${index}" >/dev/null 2>&1
					if [ "${index}" = "1" ]
					then
						values="${idxval}"
					else
						values="${values}, ${idxval}"
					fi
					index=$((index+1))
				done
				values="$(printf "%s" "${values}" | awk '{NR=1;max=98;if(length($0)>max+1)while($0){if(NR==1){print substr($0,1,max)}else{printf"%-22s%s\n","",substr($0,1,max)}{$0=substr($0,max+1);NR=NR+1}}else print}')"
				printf "%s\n" "${values:-"-"}"
				json_select ".."
			else
				printf "  + %-15s : %s\n" "${key}" "${value:-"-"}"
			fi
		done
	else
		printf "%s\n" "::: no adblock runtime information available"
	fi
}

timer()
{
	local cron_file cron_content cron_lineno action="${1:-"list"}" cron_tasks="${2}" hour="${3}" minute="${4:-0}" weekday="${5:-"*"}"

	cron_file="/etc/crontabs/root"

	if [ -s "${cron_file}" ] && [ "${action}" = "list" ]
	then
		awk '{print NR ">  " $0}' "${cron_file}"
	elif [ "${action}" = "add" ]
	then
		hour="${hour//[[:alpha:]]/}"
		minute="${minute//[[:alpha:]]/}"
		if [ -n "${cron_tasks}" ] && [ -n "${hour}" ] && [ -n "${minute}" ] && [ -n "${weekday}" ] && \
			[ "${hour}" -ge 0 ] && [ "${hour}" -le 23 ] && \
			[ "${minute}" -ge 0 ] && [ "${minute}" -le 59 ]
		then
			printf "%02d %02d %s\n" "${minute}" "${hour}" "* * ${weekday} ${adb_init} ${cron_tasks}" >> "${cron_file}"
			/etc/init.d/cron restart
		fi
	elif [ -s "${cron_file}" ] && [ "${action}" = "remove" ]
	then
		cron_tasks="${cron_tasks//[[:alpha:]]/}"
		cron_lineno="$(awk 'END{print NR}' "${cron_file}")"
		cron_content="$(awk '{print $0}' "${cron_file}")"
		if [ "${cron_tasks:-"0"}" -le "${cron_lineno:-"1"}" ] && [ -n "${cron_content}" ]
		then
			printf "%s\n" "${cron_content}" | awk "NR!~/^${cron_tasks}$/" > "${cron_file}"
			/etc/init.d/cron restart
		fi
	fi
}

service_triggers()
{
	local iface delay

	iface="$(uci_get adblock global adb_trigger)"
	delay="$(uci_get adblock global adb_triggerdelay "5")"
	PROCD_RELOAD_DELAY=$((delay*1000))

	if [ -z "${iface}" ]
	then
		. "/lib/functions/network.sh"
		network_find_wan iface
		if [ -n "${iface}" ]
		then
			uci_set adblock global adb_trigger "${iface}"
			uci_commit "adblock"
		fi
	fi
	if [ -n "${iface}" ]
	then
		procd_add_interface_trigger "interface.*.up" "${iface}" "${adb_init}" "start"
	fi
	procd_add_reload_trigger "adblock"
}