#!/bin/bash

# kf2-srv is a command line tool for managing a set of Killing Floor 2 servers.
# Copyright (C) 2019, 2020 GenZmeY
# mailto: genzmey@gmail.com
# 
# This file is part of kf2-srv.
#
# kf2-srv is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

readonly ScriptFullname=$(readlink -e "$0")
readonly ScriptName=$(basename $0)
readonly ScriptVersion=$(rpm -q --queryformat '%{VERSION}' "$ScriptName")

readonly GrpDir=":DEFINE_PREFIX:/share/kf2-srv/cmdgrp"
readonly LibDir=":DEFINE_PREFIX:/share/kf2-srv/lib"

readonly InstallDir=":DEFINE_PREFIX:/games/kf2-srv${KF2POSTFIX}"
readonly AppBin="$InstallDir/Binaries/Win64/KFGameSteamServer.bin.x86_64"

readonly DefaultConfigDir="$InstallDir/KFGame/Config"
readonly DefaultDownloadDir="$InstallDir/Binaries/Win64/steamapps/workshop"
readonly DefaultCacheDir="$InstallDir/KFGame/Cache"
readonly DefaultLogDir="$InstallDir/KFGame/Logs"

readonly DownloadDir="/var/cache/kf2-srv/workshop"
readonly CacheDir="/var/cache/kf2-srv/cache"
readonly LogDir="/var/log/kf2-srv${KF2POSTFIX}"

readonly InstanceConfigDir="/etc/kf2-srv/instances${KF2POSTFIX}"
readonly InstanceConfigTemplate="/etc/kf2-srv/instance.conf.template"

readonly AppServerNum="232130"
readonly AppClientNum="232090"
readonly StrangeConstUID="17825793"
readonly ServerBotLogin="srvbot"

declare -a DiffNames
declare -a WaveNames
declare -A ModeNames
declare -A MutNames

function include () # $1: Lib
{
	if ! echo "$INC_LIBS" | grep -Foq "$1"; then
		source "$1"
		export INC_LIBS="$INC_LIBS:$1"
	fi
}

function run_as_steamuser () # $@: command
{
	include "/etc/steamcmd/steamcmd.conf"
	
	if [[ "$(whoami)" == "$SteamUser" ]]; then
		shift 3; cmd_main "$@"
	elif [[ -n $(groups "$(whoami)" | grep -Fo 'wheel') ]] || [[ "$(whoami)" == "root" ]]; then
		export INC_LIBS=""
		sudo -u "$SteamUser" "$@"
	else
		echo "You must be a $SteamUser, root or sudo-user to run this command."
	fi
}

function run_as_root () # $@: command
{
	if [[ "$(whoami)" == "root" ]]; then
		shift 3; cmd_main "$@"
	elif [[ -n $(groups "$(whoami)" | grep -Fo 'wheel') ]]; then
		export INC_LIBS=""
		sudo "$@"
	else
		echo "You must be root or sudo-user to run this command."
	fi
}

function is_help () # $1: Arg
{
	echo "$1" | grep -Piqo '^(-h|--help|help)$'
}

function is_usage () # $1: Arg
{
	echo "$1" | grep -Piqo '^usage$'
}

function is_version () # $1: Arg
{
	echo "$1" | grep -Piqo '^(-v|--version|version)$'
}

function server_exists ()
{
	test -x "$AppBin"
}

function function_exists () # $1: function name
{
	type "$1" &> /dev/null
}

function indent () # $1: Level
{
	local Tab='  '
	for ((i=0; i<$1; i++))
	do
		echo -n "$Tab"
	done
}

function groups_list ()
{
	find "$GrpDir"       \
		-mindepth 1      \
		-maxdepth 1      \
		-type d          \
		-printf "%f\n" | \
	sort
}

function commands_list () # $1: Command group
{
	find "$GrpDir/$1"    \
		-mindepth 1      \
		-maxdepth 1      \
		-type f          \
		-printf "%f\n" | \
	sort
}

function group_info () # $1: Command group
{
	local Command
	for Command in $(commands_list $1)
	do
		local CommandPathName="$GrpDir/$1/$Command"
		(	# subshell
			source "$CommandPathName"
			if function_exists "cmd_usage"; then
				echo "$(indent 1)${ScriptName}${KF2POSTFIX} $1 $Command $(cmd_usage)"
			else
				echo "$(indent 1)${ScriptName}${KF2POSTFIX} $1 $Command"
			fi
			if function_exists "cmd_info"; then
				cmd_info | sed -r "s|^|$(indent 2)|g"
			else
				echo "$(indent 2)No information"
			fi
		)
	done
}

function full_info ()
{
	echo "${ScriptName}${KF2POSTFIX} v${ScriptVersion}"
	echo "Command line tool for managing a set of Killing Floor 2 servers."
	echo ""
	echo "Usage: ${ScriptName}${KF2POSTFIX} <group> <command> [<args>]"
	echo ""
	for Group in $(groups_list)
	do
		group_info "$Group"
		echo ""
	done
	echo "Use --help as an argument for information on a specific group or command"
}

Group="$1"
Command="$2"

GroupPathname="$GrpDir/$Group"
CommandPathName="$GroupPathname/$Command"

if [[ $# -eq 0 ]] || is_help "$1"; then
	full_info
	exit 0
elif is_version "$1"; then
	echo "${ScriptName}${KF2POSTFIX} v${ScriptVersion}"
	exit 0
elif [[ -d "$GroupPathname" ]]; then
	shift
	if [[ $# -eq 0 ]] || is_help "$1"; then
		group_info "$Group"
		exit 0
	elif [[ -r "$CommandPathName" ]]; then
		shift
		source "$CommandPathName"
		if is_help "$1"; then
			if function_exists "cmd_help"; then
				cmd_help
			else
				echo "No help page for this command."
			fi
		elif is_usage "$1"; then
			if function_exists "cmd_usage"; then
				cmd_usage
			else
				echo "No usage information for this command."
			fi
		else
			if function_exists "cmd_main"; then
				if function_exists "cmd_need_installed_server" && cmd_need_installed_server && ! server_exists; then
					echo "You must install server first"
					echo "Run \"${ScriptName}${KF2POSTFIX} game update\" to install it"
					exit 1
				elif function_exists "cmd_need_superuser" && cmd_need_superuser; then
					run_as_root "${ScriptFullname}${KF2POSTFIX}" "$Group" "$Command" "$@"
				elif function_exists "cmd_need_steamuser" && cmd_need_steamuser; then
					run_as_steamuser "${ScriptFullname}${KF2POSTFIX}" "$Group" "$Command" "$@"
				else
					cmd_main "$@"
				fi
			else
				echo "No implementation for the command $Command"
			fi
		fi
	else
		echo "Command not found: $Command"
		exit 1
	fi
else
	echo "Command group not found: $Group"
	exit 1
fi