#!/bin/bash
# LinuxGSM command_monitor.sh module
# Author: Daniel Gibbs
# Contributors: http://linuxgsm.com/contrib
# Website: https://linuxgsm.com
# Description: Monitors server by checking for running processes
# then passes to gamedig and gsquery.

commandname="MONITOR"
commandaction="Monitoring"
functionselfname="$(basename "$(readlink -f "${BASH_SOURCE[0]}")")"
fn_firstcommand_set

fn_monitor_check_lockfile() {
	# Monitor does not run it lockfile is not found.
	if [ ! -f "${lockdir}/${selfname}.lock" ]; then
		fn_print_dots "Checking lockfile: "
		fn_print_checking_eol
		fn_script_log_info "Checking lockfile: CHECKING"
		fn_print_error "Checking lockfile: No lockfile found: "
		fn_print_error_eol_nl
		fn_script_log_error "Checking lockfile: No lockfile found: ERROR"
		echo -e "* Start ${selfname} to run monitor."
		core_exit.sh
	fi

	# Fix if lockfile is not unix time or contains letters
	if [ -f "${lockdir}/${selfname}.lock" ] && [[ "$(head -n 1 "${lockdir}/${selfname}.lock")" =~ [A-Za-z] ]]; then
		date '+%s' > "${lockdir}/${selfname}.lock"
		echo "${version}" >> "${lockdir}/${selfname}.lock"
		echo "${port}" >> "${lockdir}/${selfname}.lock"
	fi
}

fn_monitor_check_update() {
	# Monitor will check if update is already running.
	if [ "$(pgrep "${selfname} update" | wc -l)" != "0" ]; then
		fn_print_dots "Checking active updates: "
		fn_print_checking_eol
		fn_script_log_info "Checking active updates: CHECKING"
		fn_print_error_nl "Checking active updates: SteamCMD is currently checking for updates: "
		fn_print_error_eol
		fn_script_log_error "Checking active updates: SteamCMD is currently checking for updates: ERROR"
		core_exit.sh
	fi
}

fn_monitor_check_session() {
	fn_print_dots "Checking session: "
	fn_print_checking_eol
	fn_script_log_info "Checking session: CHECKING"
	# uses status var from check_status.sh
	if [ "${status}" != "0" ]; then
		fn_print_ok "Checking session: "
		fn_print_ok_eol_nl
		fn_script_log_pass "Checking session: OK"
	else
		fn_print_error "Checking session: "
		fn_print_fail_eol_nl
		fn_script_log_fatal "Checking session: FAIL"
		alert="restart"
		alert.sh
		fn_script_log_info "Checking session: Monitor is restarting ${selfname}"
		command_restart.sh
		core_exit.sh
	fi
}

fn_monitor_check_queryport() {
	# Monitor will check queryport is set before continuing.
	if [ -z "${queryport}" ] || [ "${queryport}" == "0" ]; then
		fn_print_dots "Checking port: "
		fn_print_checking_eol
		fn_script_log_info "Checking port: CHECKING"
		if [ -n "${rconenabled}" ] && [ "${rconenabled}" != "true" ] && [ ${shortname} == "av" ]; then
			fn_print_warn "Checking port: Unable to query, rcon is not enabled"
			fn_script_log_warn "Checking port: Unable to query, rcon is not enabled"
		else
			fn_print_error "Checking port: Unable to query, queryport is not set"
			fn_script_log_error "Checking port: Unable to query, queryport is not set"
		fi
		core_exit.sh
	fi
}

fn_query_gsquery() {
	if [ ! -f "${functionsdir}/query_gsquery.py" ]; then
		fn_fetch_file_github "lgsm/functions" "query_gsquery.py" "${functionsdir}" "chmodx" "norun" "noforce" "nohash"
	fi
	"${functionsdir}"/query_gsquery.py -a "${queryip}" -p "${queryport}" -e "${querytype}" > /dev/null 2>&1
	querystatus="$?"
}

fn_query_tcp() {
	bash -c 'exec 3<> /dev/tcp/'${queryip}'/'${queryport}'' > /dev/null 2>&1
	querystatus="$?"
}

fn_monitor_query() {
	# Will loop and query up to 5 times every 15 seconds.
	# Query will wait up to 60 seconds to confirm server is down as server can become non-responsive during map changes.
	totalseconds=0
	for queryattempt in {1..5}; do
		for queryip in "${queryips[@]}"; do
			fn_print_dots "Querying port: ${querymethod}: ${queryip}:${queryport} : ${totalseconds}/${queryattempt}: "
			fn_print_querying_eol
			fn_script_log_info "Querying port: ${querymethod}: ${queryip}:${queryport} : ${queryattempt} : QUERYING"
			# querydelay
			if [ "$(head -n 1 "${lockdir}/${selfname}.lock")" -gt "$(date "+%s" -d "${querydelay} mins ago")" ]; then
				fn_print_ok "Querying port: ${querymethod}: ${ip}:${queryport} : ${totalseconds}/${queryattempt}: "
				fn_print_delay_eol_nl
				fn_script_log_info "Querying port: ${querymethod}: ${ip}:${queryport} : ${queryattempt} : DELAY"
				fn_script_log_info "Query bypassed: ${gameservername} started less than ${querydelay} minutes ago"
				fn_script_log_info "Server started: $(date -d @$(head -n 1 "${lockdir}/${selfname}.lock"))"
				fn_script_log_info "Current time: $(date)"
				monitorpass=1
				core_exit.sh
			# will use query method selected in fn_monitor_loop
			# gamedig
			elif [ "${querymethod}" == "gamedig" ]; then
				query_gamedig.sh
			# gsquery
			elif [ "${querymethod}" == "gsquery" ]; then
				fn_query_gsquery
			#tcp query
			elif [ "${querymethod}" == "tcp" ]; then
				fn_query_tcp
			fi

			if [ "${querystatus}" == "0" ]; then
				# Server query OK.
				fn_print_ok "Querying port: ${querymethod}: ${queryip}:${queryport} : ${totalseconds}/${queryattempt}: "
				fn_print_ok_eol_nl
				fn_script_log_pass "Querying port: ${querymethod}: ${queryip}:${queryport} : ${queryattempt}: OK"
				monitorpass=1
				if [ "${querystatus}" == "0" ]; then
					# Add query data to log.
					if [ "${gdname}" ]; then
						fn_script_log_info "Server name: ${gdname}"
					fi
					if [ "${gdplayers}" ]; then
						fn_script_log_info "Players: ${gdplayers}/${gdmaxplayers}"
					fi
					if [ "${gdbots}" ]; then
						fn_script_log_info "Bots: ${gdbots}"
					fi
					if [ "${gdmap}" ]; then
						fn_script_log_info "Map: ${gdmap}"
					fi
					if [ "${gdgamemode}" ]; then
						fn_script_log_info "Game Mode: ${gdgamemode}"
					fi

					# send LinuxGSM stats if monitor is OK.
					if [ "${stats}" == "on" ] || [ "${stats}" == "y" ]; then
						info_stats.sh
					fi
				fi
				core_exit.sh
			else
				# Server query FAIL.
				fn_print_fail "Querying port: ${querymethod}: ${queryip}:${queryport} : ${totalseconds}/${queryattempt}: "
				fn_print_fail_eol
				fn_script_log_warn "Querying port: ${querymethod}: ${queryip}:${queryport} : ${queryattempt}: FAIL"
				# Monitor will try gamedig (if supported) for first 30s then gsquery before restarting.
				# gsquery will fail if longer than 60s
				if [ "${totalseconds}" -ge "59" ]; then
					# Monitor will FAIL if over 60s and trigger gane server reboot.
					fn_print_fail "Querying port: ${querymethod}: ${queryip}:${queryport} : ${totalseconds}/${queryattempt}: "
					fn_print_fail_eol_nl
					fn_script_log_warn "Querying port: ${querymethod}: ${queryip}:${queryport} : ${queryattempt}: FAIL"
					# Send alert if enabled.
					alert="restartquery"
					alert.sh
					command_restart.sh
					fn_firstcommand_reset
					core_exit.sh
				fi
			fi
		done
		# Second counter will wait for 15s before breaking loop.
		for seconds in {1..15}; do
			fn_print_fail "Querying port: ${querymethod}: ${ip}:${queryport} : ${totalseconds}/${queryattempt}: ${cyan}WAIT${default}"
			sleep 0.5
			totalseconds=$((totalseconds + 1))
			if [ "${seconds}" == "15" ]; then
				break
			fi
		done
	done
}

fn_monitor_loop() {
	# loop though query methods selected by querymode.
	totalseconds=0
	if [ "${querymode}" == "2" ]; then
		local query_methods_array=(gamedig gsquery)
	elif [ "${querymode}" == "3" ]; then
		local query_methods_array=(gamedig)
	elif [ "${querymode}" == "4" ]; then
		local query_methods_array=(gsquery)
	elif [ "${querymode}" == "5" ]; then
		local query_methods_array=(tcp)
	fi
	for querymethod in "${query_methods_array[@]}"; do
		# Will check if gamedig is installed and bypass if not.
		if [ "${querymethod}" == "gamedig" ]; then
			if [ "$(command -v gamedig 2> /dev/null)" ] && [ "$(command -v jq 2> /dev/null)" ]; then
				if [ -z "${monitorpass}" ]; then
					fn_monitor_query
				fi
			else
				fn_script_log_info "gamedig is not installed"
				fn_script_log_info "https://docs.linuxgsm.com/requirements/gamedig"
			fi
		else
			# will not query if query already passed.
			if [ -z "${monitorpass}" ]; then
				fn_monitor_query
			fi
		fi
	done
}

monitorflag=1
check.sh
core_logs.sh
info_game.sh

# query pre-checks
fn_monitor_check_lockfile
fn_monitor_check_update
fn_monitor_check_session
# Monitor will not continue if session only check.
if [ "${querymode}" != "1" ]; then
	fn_monitor_check_queryport

	# Add a querydelay of 1 min if var missing.
	if [ -z "${querydelay}" ]; then
		querydelay="1"
	fi

	fn_monitor_loop
fi
core_exit.sh