#!/bin/sh
die() { printf '%s\n' "$*" >&2; exit 1; }
dietail() {
	printf '%s\n' "$*" >&2
	printf 'tail %s:\n' "$log" >&2
	tail "$serverbase/logs/$log"
	exit 1
}
[ $# -ge 1 ] || die "Syntax: $(basename "$0") <server version> [--test] [<additional parameters for wesnothd>]"
set -o nounset
set -o noclobber

server=$1
serverbase="$HOME/servers/$server"
[ -d "$serverbase" ] || die "Server '$server' not found."
[ -d "$serverbase"/logs ] || mkdir "$serverbase"/logs
[ -d "$serverbase"/replays ] || mkdir "$serverbase"/replays

shift
if [ $# -ge 1 ] && [ "$1" = "--test" ]; then
	shift
	cd "$serverbase"/build || exit 1
	bin/wesnothd-"$server" -c "$serverbase"/wesnothd.cfg --port 15001 "$@"
	# remove the socket so it looks like we never ran the server
	rm var/run/socket
	exit 0
fi

port=15000
case $server in
1.4|1.8)
	port=14998
	set -- --threads 8 "$@";;
1.6)    port=14999
	set -- --threads 8 "$@";;
1.5*)   port=14999
	set -- --threads 16 "$@";;
1.7*)   port=14997
	set -- --threads 16 "$@";;
1.9*|1.10*)
	port=14996
	set -- --threads 8 "$@";;
1.12*)
	set -- --threads 30 "$@";;
1.1[3468]*)
	set -- --keepalive "$@";;
trunk)
	set -- --keepalive --log-debug=sql_executor "$@";;
*)
	printf 'Unrecognized version %s, using default options...\n' "$server"
	set -- --keepalive "$@";;
esac

ulimit -Ss 2048
ulimit -c unlimited

# send the standard server message to the appropriate server when killing it with ctrl+c
#trap "$HOME/bin/send_server_message $server; sleep 2; echo -n 'terminated: '; date; exit 0" INT
trap 'printf "terminated: "; date; exit' INT

while true
do
	cd "$serverbase"/build || exit 1
	[ -x "bin/wesnothd-$server" ] || die "Executable 'bin/wesnothd-$server' not found."

	date=$(date +"%Y%m%d-%H%M%S")
	[ -r "$serverbase"/redirect.cfg ] && port=$(sed -nE '/port=/s/[[:blank:]]*port="?([0-9]+)"?/\1/p' "$serverbase"/redirect.cfg)
	builddir=$(readlink "$serverbase"/build)
	#rev=r$(echo $builddir | sed -nre "s,.*wesnothd-svn-([0-9:SM]+)_$server$,\1,p")
	rev=${builddir#*wesnothd-*-git-}
	log="wesnothd.$date.$rev.log"
	bin/wesnothd-"$server" -c "$serverbase"/wesnothd.cfg --port "$port" "$@" > "$serverbase/logs/$log" 2>&1 &
	pid=$!
	trap 'kill "$pid"; trap - INT; kill -s INT "$$"' INT # kill backgrounded wesnothd on INT (background processes ignores INT so kill with TERM) and properly die from the signal
	printf 'started %s server with command: '\''wesnothd-%s -c "%s"/wesnothd.cfg --port %s %s'\'' (commit: %s, pid: %s) logging to: %s\n' "$server" "$server" "$serverbase" "$port" "$*" "$rev" "$pid" "$log"
	# wait a bit in case the process dies immediately
	sleep 5
	if kill -0 "$pid"
	then # create some convenient links
		ln -s "$serverbase/logs/$log" "$log.$pid"
		rm -f "$serverbase"/old.log "$serverbase"/old.pid
		mv "$serverbase"/current.log "$serverbase"/old.log > /dev/null 2>&1
		mv "$serverbase"/current.pid "$serverbase"/old.pid > /dev/null 2>&1
		printf %s "$pid" > "$serverbase"/current.pid
		ln -s "logs/$log" "$serverbase"/current.log
	fi

	# wait for the server to terminate
	wait "$pid"
	exit_code=$?
	printf '%s wesnothd exited with code: %s\n' "$(date +'%Y%m%d %T')" "$exit_code"
	trap - INT
	# need to use the recorded path since the build/ symlink might have changed
	mv "$serverbase/$builddir/gmon.out" "$serverbase/$builddir/gmon.$date.$rev.out" > /dev/null 2>&1
	# check for return code if not zero or 98 (port in use) the server should be restarted
	case $exit_code in
	0)          exit ;;
	98|127|128) dietail ;; #Could not bind to port #Command not found #Invalid argument to exit
	esac

	printf '%s tail %s:\n'  "$(date +'%Y%m%d %T')" "$log"
	tail "$serverbase/logs/$log"
	echo
done