#!/bin/sh

# Purpose {{{
## Try to centralize all game's save in order to :
##	easily backup all save
##	easily restore it
##	be able to access it from anywhere
##	… all you can do with a Nextcloud (share, versionning,…)
##
## 1. Move save directories of a list of known games from Steam's
## userdata to a remote directory (Nextcloud, remote mount,…).
## Then create a symlink in userdata directory to the remote game
## directory.
##
## 2. If a directory doesn't exist, check if a remote one is
## available and symlink it.
##
## TODO : 3. List directories without symlinks.
##
## KISS : Only manage save directories from Steam userdata. For other
## paths ($XDG_DATA_HOME,…) check other scripts.
# }}}

# Vars {{{
debug=0

## Steam {{{
steam_id="112595584"
steam_userdata=".steam/steam/userdata/${steam_id}"

## List of Steam games to backup
### 204360 − Castle Crashers − https://pcgamingwiki.com/wiki/Castle_Crashers
steam_games="1 204360 17"
## }}}

remote_dir="${HOME}/Nextcloud/games/linux.sgl.script"
remote_steam_userdata="${remote_dir}/${steam_userdata}"

local_steam_userdata="${HOME}/${steam_userdata}"
# }}}

# Functions {{{
# Move one Steam save game dir {{{
move_steam_game_dir() {
	_game_id="${1}"
	_local_game_path="${local_steam_userdata}/${_game_id}"
	_remote_game_path="${remote_steam_userdata}/${_game_id}"

	## If a remote directory doesn't already exists for this game
	if [ ! -d "${_remote_game_path}" ]; then
		mv -- "${_local_game_path}" "${_remote_game_path}"
		[ "${debug}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "Move Steam game − The data of ${_game_id} − ${_local_game_path} moved to remote storage."
		ln -s -- "${_remote_game_path}" "${_local_game_path}"
		[ "${debug}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "Move Steam game − Symlink remote to data of ${_game_id} to local storage."
	else
		printf '\e[1;35m%-6s\e[m\n' "Move Steam game − ${_game_id} already have data on remote storage : ${_remote_game_path}. Abort to avoid to delete data."
		exit 5
	fi
}
# }}}
# Symlink one Steam save game dir from remote to local {{{
symlink_steam_game_dir() {
	_game_id="${1}"
	_local_game_path="${local_steam_userdata}/${_game_id}"
	_remote_game_path="${remote_steam_userdata}/${_game_id}"

	if [ -d "${_remote_game_path}" ]; then
		ln -s -- "${_remote_game_path}" "${_local_game_path}"
		[ "${debug}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Symlink Steam game — Symlink remote data of ${_game_id} to local storage."
	else
		[ "${debug}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Symlink Steam game — ${_game_id} doesn't have remote data."
	fi
}
# }}}

# }}}

# Tests {{{

## Ensure remote dir exist {{{
if [ ! -d "${remote_dir}" ]; then
	printf '\e[1;35m%-6s\e[m\n' "The directory for save game doesn't exists : ${remote_dir}"
	exit 1
fi
## }}}
## Ensure Steam dir exist {{{
if [ ! -d "${local_steam_userdata}" ]; then
	printf '\e[1;35m%-6s\e[m\n' "The Steam directory for your ID (${steam_id}) doesn't exists yet… Should it must be create (for restoration,…) [Y/n] ?"
	read -r create_local_steam_userdata
	if [ "${create_local_steam_userdata}" = "" ] || [ "${create_local_steam_userdata}" = "Y" ] || [ "${create_local_steam_userdata}" = "y" ]; then
		mkdir -p -- "${local_steam_userdata}"
	else
		printf '\e[1;35m%-6s\e[m\n' "Steam directory doesn't exists, abort script."
		exit 2
	fi
fi
## }}}

# }}}

# Manage Steam save game {{{
for game_id in ${steam_games}; do
	local_game_path="${local_steam_userdata}/${game_id}"
	local_game_path_type="$(file ${local_steam_userdata}/${game_id} | cut -d' ' -f2)"

	case ${local_game_path_type} in
		## Data is already a symlink
		"symbolic")
			[ "${debug}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Steam for loop — The data of ${game_id} are already symlinked to .... Skip."
		;;
		## Data is still a directory
		"directory")
			move_steam_game_dir "${game_id}"
			;;
		## Data can't be managed
		"cannot")
			[ "${debug}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Steam for loop — The data of ${game_id} − ${local_game_path} doesn't exist. Skip."
			symlink_steam_game_dir "${game_id}"
			;;
		*)
			printf '\e[1;35m%-6s\e[m\n' "Data of ${game_id} − ${local_game_path} are not managed. Type: ${local_game_path_type}. Abort"
			exit 3
			;;
	esac

done
# }}}