#!/bin/bash
# Author: Sys4
# License: GPLv3

usage() {
    echo "Usage: ./install_nalc.sh [options] [--] [destination]"
    echo
    echo "Description:"
    echo -e "\tDownload and install the files needed by the NALC server to the"
    echo -e "\toptional [destination] folder. Otherwise the current directory"
    echo -e "\twill be used."
    echo
    echo -e "\tBut, be carefull!"
    echo -e "\tBy default the ~/.minetest dir will also be used and modified."
    echo -e "\tSo, make a backup of your ~/.minetest directory before the"
    echo -e "\tinstallation of this server or specify a new directory with the"
    echo -e "\t --minetest-dir or -d option."
    echo
    echo "Requirements:"
    echo -e "\t- Official Minetest server must be already installed on your system."
    echo -e "\tIf it is not the case, please refers to the https://minetest.net"
    echo -e "\twebsite for the installation instructions."
    echo -e "\t- You'll also need git, cmake, make."
    echo
    echo "Options:"
    echo -e "\t-h --help\t  This help."
    echo -e "\t-b --minetest-bin <path> Minetest server executable path."
    echo -e "\t-d --minetest-dir <dir>  Minetest directory to use for installing nalc mods, nalc game, minetest.conf…"
    echo -e "\t-m --map-backend <sqlite3|leveldb|redis|postgresql|dummy>"
    echo -e "\t-p --player-backend <sqlite3|leveldb|postgresql|dummy|files>"
    echo -e "\t-a --auth-backend <sqlite3|leveldb|postgresql|files>"
    echo -e "\t-M --minetest-mapper Install with minetest mapper support."
    echo -e "\t-w --world <name> Custom world name."
    echo -e "\t-P --port <port> Custom server port number."
    echo -e "\t--url <URL> Custom remote URL."
    echo -e "\t--branch <stable|dev|exp> Choose the version to install (stable by default)"
    echo
    echo "License: GPLv3. Please read the LICENSE file."
    echo "Author: Sys4 - https://sys4.fr#contact"

    exit 0
}

strip() {
    echo $1 | cut -d \' -f 2
}

verif() {
    if [[ $? -gt 0 ]]; then
	echo "Error! Exit."
	exit 1
    fi
}

error() {
    if [[ -n $1 ]]; then
	echo "ERROR: $1"! >&2
    else
	echo "ERROR: Invalid option!" >&2
	echo "Use -h option for help." >&2
    fi
    exit 1
}

save_conf() {
    local conf="$1"
    echo "MINETEST_BIN=$MINETEST_BIN" > "$conf"    
    echo "MINETEST_DIR=$MINETEST_DIR" >> "$conf"
    echo "MAP_BACKEND=$MAP_BACKEND" >> "$conf"
    echo "PLAYER_BACKEND=$PLAYER_BACKEND" >> "$conf"
    echo "AUTH_BACKEND=$AUTH_BACKEND" >> "$conf"
    echo "MINETEST_MAPPER=$MINETEST_MAPPER" >> "$conf"
    echo "URL=$URL" >> "$conf"
    echo "BRANCH=$BRANCH" >> "$conf"
    echo "WORLD_NAME=$WORLD_NAME" >> "$conf"
    echo "PORT=$PORT" >> "$conf"
}

load_conf() {
    . "$1"
}

install_game() {
    local game_dir="$MINETEST_DIR/games/nalc_game"
    if [ -d "$game_dir" ]; then
	echo "Previous installation of NALC game detected."
	read -p "Upgrade? ([Y]es/[n]o/clean/[c]ancel) " continue
	case "$continue" in
	    [yY][eE][sS]|[yY]|"")
		echo "Upgrading…"
		pushd "$game_dir"
		git pull
		verif
		popd;;
	    [cC][lL][eE][aA][nN])
		echo "Cleaning…"
		rm -rf "$game_dir"
		verif;;
	    [cC][aA][nN][cC][eE][lL]|[cC])
		echo "Upgrade cancelled."
		exit 0;;
	esac
    fi
    if [ ! -d "$game_dir" ]; then
	local git_branch
	local depth
	case $BRANCH in
	    "stable")
		git_branch="-b master"
		depth="--depth 1"
		;;
	    "dev")
		git_branch="-b dev"
		;;
	    "exp")
		git_branch="-b experimental"
		;;
	esac
	[ -z "$git_branch" ] && error "Invalid branch"

	echo "Cloning $URL""nalc/nalc_game.git to $game_dir…"
	mkdir -p "$MINETEST_DIR/games"
	verif
	git clone $depth $git_branch $URL"nalc/nalc_game.git" "$game_dir"
	verif
    fi
    echo "NALC game installed/upgraded."
}

install_mods() {
    local mods_dir="$MINETEST_DIR/mods"
    if [ -d "$mods_dir" ]; then
	echo "Mods directory is not empty."
	read -p "Upgrade? ([Y]es/[n]o/clean/[c]ancel) " continue
	case "$continue" in
	    [yY][eE][sS]|[yY]|"")
		echo "Upgrading…"
		"$SCRIPT_DIR"/upgrade.sh -m -s "$DESTINATION"
		verif
		;;
	    [cC][lL][eE][aA][nN])
		echo "Cleaning…"
		rm -rf "$mods_dir"
		verif
		;;
	    [cC][aA][nN][cC][eE][lL]|[cC])
		echo "Upgrade cancelled."
		exit 0;;
	esac
    fi
    if [ ! -d "$mods_dir" ]; then
	local git_branch
	local depth
	case $BRANCH in
	    "stable")
		git_branch="-b master"
		depth="--depth 1"
		;;
	    "dev")
		git_branch="-b dev"
		;;
	    "exp")
		git_branch="-b experimental"
		;;
	esac
	[ -z $git_branch ] && error "Invalid branch"

	echo "Cloning $URL/nalc-server-mods.git to $mods_dir…"
	git clone $depth $git_branch $URL"nalc/nalc-server-mods.git" "$mods_dir"
	verif
	pushd "$mods_dir"
	git submodule update --init --recursive
	verif
	popd
    fi
    echo "Mods for NALC installed/upgraded."
}

install_world() {
    local world_dir="$MINETEST_DIR/worlds/$WORLD_NAME"
    if [ -d "$world_dir" ]; then
	echo "$WORLD_NAME already exist."
	read -p "Upgrade $WORLD_NAME? ([Y]es/[n]o/[c]lean) " continue
	case "$continue" in
	    [yY][eE][sS]|[yY]|"")
		echo "Upgrading…"
		[ -d "$world_dir"_old ] && rm -rf "$world_dir"_old
		cp -r "$world_dir" "$world_dir"_old
		verif
		;;
	    [cC][lL][eE][aA][nN]|[cC])
		echo "Cleaning…"
		[ -d "$world_dir"_old ] && rm -rf "$world_dir"_old
		mv "$world_dir" "$world_dir"_old
		verif
		;;
	esac
    fi
    if [ ! -d "$world_dir" ]; then
	mkdir -p "$world_dir/runes"
	verif

	local mt=$world_dir/world.mt
	echo "Generating $mt""…"
	
	echo "gameid = nalc_game" > $mt
	echo "enable_damage = true" >> $mt
	echo "creative_mod = false" >> $mt
        case $MAP_BACKEND in
	    "sqlite3"|"")
		echo "backend = sqlite3" >> $mt
		;;
	    "leveldb")
		echo "backend = leveldb" >> $mt
		;;
	    "redis")
		echo "backend = redis" >> $mt
		read -p "redis_address? " val
		echo "redis_address = $val" >> $mt
		read -p "redis_hash? " val
		echo "redis_hash = $val" >> $mt
		read -p "redis_port? (6379) " val
		[ -z $val ] && val=6379
		echo "redis_port = $val" >> $mt
		;;
	    "postgresql")
		echo "backend = postgresql" >> $mt
		read -p "DB address? " val
		read -p "DB user? " val2
		read -p "DB password? " val3
		read -p "DB name? " val4
		read -p "DB port? (5432) " val5
		[ -z $val5 ] && val5=5432
		echo "pgsql_connection = host=$val port=$val5 user=$val2 password=$val3 dbname=$val4" >> $mt
		;;
	    "dummy")
		echo "backend = dummy" >> $mt
		;;
	    *)
		error "$MAP_BACKEND is not valid";;
	esac
	case $PLAYER_BACKEND in
	    "sqlite3"|"")
		echo "player_backend = sqlite3" >> $mt
		;;
	    "leveldb")
		echo "player_backend = leveldb" >> $mt
		;;
	    "postgresql")
		echo "player_backend = postgresql" >> $mt
		read -p "DB address? ($val) " vval
		read -p "DB user? ($val2) " vval2
		read -p "DB password? ($val3) " vval3
		read -p "DB name? (players-$val4) " vval4
		read -p "DB port? ($val5) " vval5
		[ -z $vval ] && vval=$val
		[ -z $vval2 ] && vval2=$val2
		[ -z $vval3 ] && vval3=$val3
		[ -z $vval4 ] && vval4="players-$val4"
		[ -z $vval5 ] && vval5=$val5
		echo "pgsql_player_connection = host=$vval port=$vval5 user=$vval2 password=$vval3 dbname=$vval4" >> $mt
		;;
	    "dummy")
		echo "player_backend = dummy" >> $mt
		;;
	    "files")
		echo "player_backend = files" >> $mt
		;;
	    *)
		error "$PLAYER_BACKEND is not valid";;
	esac
	case $AUTH_BACKEND in
	    "sqlite3"|"")
		echo "auth_backend = sqlite3" >> $mt
		;;
	    "leveldb")
		echo "auth_backend = leveldb" >> $mt
		;;
	    "postgresql")
		echo "auth_backend = postgresql" >> $mt
		read -p "DB address? ($val) " vval
		read -p "DB user? ($val2) " vval2
		read -p "DB password? ($val3) " vval3
		read -p "DB name? (auth-$val4) " vval4
		read -p "DB port? ($val5) " vval5
		[ -z $vval ] && vval=$val
		[ -z $vval2 ] && vval2=$val2
		[ -z $vval3 ] && vval3=$val3
		[ -z $vval4 ] && vval4="auth-$val4"
		[ -z $vval5 ] && vval5=$val5
		echo "pgsql_auth_connection = host=$vval port=$vval5 user=$vval2 password=$vval3 dbname=$vval4" >> $mt
		;;
	    "files")
		echo "auth_backend = files" >> $mt
		;;
	    *)
		error "$AUTH_BACKEND is not valid";;
	esac
	read -p "Server announce? (y/N) " val
	if [[ $val =~ [yY][eE][sS]|[yY] ]]; then
	    echo "server_announce = true" >> $mt
	else
	    echo "server_announce = false" >> $mt
	fi
    fi
}

install_mtmapper() {
    if [ ! -d "$DESTINATION/minetestmapper" ]; then
	echo "Clone Minetest mapper…"
	git clone --depth 1 $URL"/minetest/minetestmapper.git" "$DESTINATION/minetestmapper"
	verif
    else
	echo "Upgrading Minetest mapper…"
	pushd "$DESTINATION/minetestmapper"
	git pull
	verif
	popd
    fi

    pushd "$DESTINATION/minetestmapper"
    cmake .
    [ $? -eq 1 ] && error "CMake failed. Check dependencies"
    make -j$(nproc)
    verif
    popd

    if [ ! -d "$DESTINATION/leaftest" ]; then
	echo "Installing leaftest…"
	git clone --recursive --depth 1 $URL"nalc/leaftest.git" "$DESTINATION/leaftest"
	verif
    else
	echo "Upgrading leaftest…"
	pushd "$DESTINATION/leaftest"
	git pull
	verif
	popd
    fi
}

post_install() {
    if [[ "$DESTINATION" != "$SCRIPT_DIR" ]]; then
	cp "$SCRIPT_DIR/mods_disabled.txt" "$DESTINATION"
    fi

    "$SCRIPT_DIR"/upgrade.sh -w $WORLD_NAME -b $BRANCH -s "$DESTINATION"
    "$SCRIPT_DIR"/upgrade.sh -w $WORLD_NAME -b $BRANCH -f mtconf -s "$DESTINATION"

    echo "Please, review and edit the following files:"
    echo -e "\t- $MINETEST_DIR/minetest.conf"
    echo -e "\t- $DESTINATION/mods_disabled.txt"
    echo
    
    if [ $MINETEST_MAPPER -eq 1 ]; then
	echo "The use of Minetest Mapper needs ImageMagick with fontconfig and truetype dependencies."
	echo "You also need to allow read and write permissions for PS. The configuration can be found in the file that manage the security policy of ImageMagick."
    fi
}

action() {
    echo "Preparing the installation…"
    
    SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" &> /dev/null && pwd)
    DESTINATION="$1"
    [ -z $DESTINATION ] && DESTINATION="$SCRIPT_DIR"

    GIT=$(which git)
    CMAKE=$(which cmake)
    MAKE=$(which make)
    [ ! -e "$GIT" ] && error "git not found"
    [ ! -e "$CMAKE" ] && error "cmake not found"
    [ ! -e "$MAKE" ] && error "make not found"
        
    if [ -e "$DESTINATION/nalc.conf" ]; then
	read -p "Previous installation is detected. Do you want to load previous settings? [Y/n] " continue	    
	if [ -z $continue ] || [[ "$continue" =~ ^[yY][eE][sS]|[yY]$ ]]; then
	    load_conf "$DESTINATION/nalc.conf"
	fi
    fi

    [ -z $MINETEST_BIN ] && MINETEST_BIN=$(which minetestserver)
    [ -z $MINETEST_DIR ] && MINETEST_DIR=~/.minetest
    [ -z $MAP_BACKEND ] && MAP_BACKEND=sqlite3
    [ -z $PLAYER_BACKEND ] && PLAYER_BACKEND=sqlite3
    [ -z $AUTH_BACKEND ] && AUTH_BACKEND=sqlite3
    [ -z $MINETEST_MAPPER ] && MINETEST_MAPPER=0
    [ -z $PORT ] && PORT=30000
    [ -z $URL ] && URL="https://sys4.fr/gitea/"
    [[ $URL =~ ^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]+$ ]] && URL="$URL:"
    [ -z $BRANCH ] && BRANCH="stable"
    [ -z $WORLD_NAME ] && WORLD_NAME="nalc"
    [ ! -e $MINETEST_BIN ] && error "$MINETEST_BIN not found"
    [ ! -d $MINETEST_DIR ] && error "$MINETEST_DIR not found"

    
    echo "Installation summary:"
    echo -e "\t- Server files will be downloaded from $URL"
    echo -e "\t- NALC server will be installed to $DESTINATION."
    echo -e "\t- World of NALC will be installed to $MINETEST_DIR/worlds/$WORLD_NAME"
    echo -e "\t- The minetestserver executable $MINETEST_BIN will be used."
    echo -e "\t- The $MINETEST_DIR directory will be used."
    echo -e "\t- $MAP_BACKEND will be used as map backend."
    echo -e "\t- $PLAYER_BACKEND will be used as player backend."
    echo -e "\t- $AUTH_BACKEND will be used as auth backend."
    echo -e "\t- Port used: $PORT."
    [ $MINETEST_MAPPER -eq 1 ] && echo -e "\t- Minetest mapper support added."
    echo

    read -p "Installation of NALC server will begin. Continue? [Y/n] " continue
    if [ -z $continue ] || [[ "$continue" =~ ^[yY][eE][sS]|[yY]$ ]]; then
	save_conf "$DESTINATION/nalc.conf"
	install_game
	install_mods
	install_world
	[ $MINETEST_MAPPER -eq 1 ] && install_mtmapper
	post_install
    fi
    
    echo "End of the NALC server installation. Good Bye!"
    exit 0
}

[ $# -lt 0 ] && usage

OPT=$(getopt -o h,b:,d:,m:,p:,a:,M,w:,P: -l help,minetest-bin:,minetest-dir:,map-backend:,player-backend:,auth-backend:,minetest-mapper,url:,branch:,world:,port: -- "$@")
set -- $OPT

while true; do
    case "$1" in
	-h|--help)
	    usage;;
	-b|--minetest-bin)
	    MINETEST_BIN=$(strip "$2")
	    shift 2;;
	-d|--minetest-dir)
	    MINETEST_DIR=$(strip "$2")
	    shift 2;;
	-m|--map-backend)
	    MAP_BACKEND=$(strip "$2")
	    shift 2;;
	-p|--player-backend)
	    PLAYER_BACKEND=$(strip "$2")
	    shift 2;;
	-a|--auth-backend)
	    AUTH_BACKEND=$(strip "$2")
	    shift 2;;
	-M|--minetest-mapper)
	    MINETEST_MAPPER=1
	    shift 1;;
	-w|--world)
	    WORLD_NAME=$(strip "$2")
	    shift 2;;
	-P|--port)
	    PORT=$(strip $2)
	    shift 2;;
	--url)
	    URL=$(strip "$2")
	    shift 2;;
	--branch)
	    BRANCH=$(strip "$2")
	    shift 2;;
	--)
	    shift;;
	*)
	    action $(strip "$1")
	    shift;;
    esac
done