#!/bin/sh
#
# Purpose {{{
# This script will create homedir for members of an LDAP group
#   1. Get members list from LDAP group given as argument
# …
#
# 2021-11-19
# }}}
# Vars {{{
readonly PROGNAME=$(basename "${0}")
readonly PROGDIR=$(readlink -m $(dirname "${0}"))
readonly ARGS="${*}"
readonly NBARGS="${#}"
[ -z "${DEBUG}" ] && DEBUG=1
## Export DEBUG for sub-script
export DEBUG

# Default values for some vars
#readonly MY_VAR_XY_DEFAULT="666"

## Colors
readonly PURPLE='\033[1;35m'
readonly RED='\033[0;31m'
readonly RESET='\033[0m'
readonly COLOR_DEBUG="${PURPLE}"
# }}}
usage() {                                                       # {{{

	cat <<- EOF
usage: $PROGNAME [-d|-g|-h]

Create homedir for members of the given LDAP group

EXAMPLES :
    - Create homedir for members of "ldap:group:my_group"
        ${PROGNAME} --group "ldap:group:my_group"

OPTIONS :
    -d,--debug
        Enable debug messages.

    -g,--group LDAP_GROUP_CN
        Required.
        LDAP group to parse in order to get the list of homedir
        to create.

    -h,--help
        Print this help message.

	EOF

}
# }}}
debug_message() {                                               # {{{

	local_message="${1}"

	## Print message if DEBUG is enable (=0)
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_message}"

	return 0
}
# }}}
error_message() {                                               # {{{

	local_error_message="${1}"
	local_error_code="${2}"

	## Print error message
	printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}"

	exit "${local_error_code:=66}"
}
# }}}
define_vars() {                                                 # {{{

	# If ldap_group_cn wasn't defined (argument) {{{
	if [ -z "${ldap_group_cn}" ]; then
		## Keep it empty
		ldap_group_cn=""
	fi
	# }}}

}
# }}}

is_var_empty() {                                                # {{{

	## Return False by default
	return_var_empty="1"
	## Total number of variables to test
	local_total_var="${#}"

	loop_count_var_empty="0"

	## While it remains a variable to test
	while [ "${local_total_var}" -gt "${loop_count_var_empty}" ]; do
		debug_message "is_var_empty − \
Test var: ${1}."
		### Test if this is empty and set return value to True
		[ -z "${1}" ] && return_var_empty="0"

		### Increase the number of tested variables
		loop_count_var_empty=$((loop_count_var_empty+1))

		### Shift to the next variable
		shift
	done

	return "${return_var_empty}"

}
# }}}
main() {                                                        # {{{

	## Define all vars
	define_vars

	## If ldap_group_cn is empty
	### Print help message
	### AND exit with message and error
	is_var_empty "${ldap_group_cn}" \
		&& usage \
		&& error_message "Please enter a GROUP with -g|--group option." "1"

}
# }}}

# Manage arguments                                                # {{{
# This code can't be in a function due to argument management

if [ ! "${NBARGS}" -eq "0" ]; then

	manage_arg="0"

	## If the first argument is not an option
	if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
	then
		## Print help message and exit
		printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
		printf '%b\n' "---"
		usage

		exit 1
	fi

	# Parse all options (start with a "-") one by one
	while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do

	case "${1}" in
		-d|--debug )                          ## debug
			DEBUG=0
			;;
		-g|--group )                          ## Define ldap_group_cn
			## Move to the next argument
			shift
			## Define var
			readonly ldap_group_cn="${1}"
			;;
		-h|--help )                           ## help
			usage
			## Exit after help informations
			exit 0
			;;
		* )                                   ## unknow option
			printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
			printf '%b\n' "---"
			usage
			exit 1
			;;
	esac

	debug_message "Arguments management − \
${RED}${1}${COLOR_DEBUG} option managed."

	## Move to the next argument
	shift
	manage_arg=$((manage_arg+1))

	done

	debug_message "Arguments management − \
${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
else
	debug_message "Arguments management − \
No arguments/options to manage."
fi

# }}}

main

exit 255