#!/bin/sh

# This script will check if upgrade is available for local Maco script

# Vars {{{
readonly PROGNAME=$(basename "${0}")

[ -z "${DEBUG}" ] && DEBUG=1

## Xymon
readonly TEST="maco"
readonly PLUGIN_RESULT="${XYMONTMP}/${MACHINEDOTS}.${TEST}.plugin_result"
readonly PLUGIN_STATE="${XYMONTMP}/${MACHINEDOTS}.${TEST}.plugin_state"
readonly XYMON_USERNAME="xymon"
readonly XYMON_GROUPNAME="xymon"

# By default, don't empty files newer than 10hours (600 minutes)
readonly DEFAULT_MTIME_MINUTES="600"

## Colors {{{
readonly PURPLE='\033[1;35m'
## }}}

# }}}

# Print message with DEBUG prefix and color {{{
debug_message() {

	local_debug_message="${1}"

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

}
# }}}
# Create or empty a file if it's too old {{{
## First argument (required): Absolut path to the file
## Second argument (optionnal): Maximum number of minutes since last modification
regenerate_if_too_old() {
	## Set variables according to the number of passed arguments {{{
	case $# in
		0 )
			debug_message "regenerate_if_too_old − \
Need at least 1 argument."
			exit 1
			;;
		1 )
			_file="${1}"
			debug_message "regenerate_if_too_old − \
Use DEFAULT_MTIME_MINUTES value: ${DEFAULT_MTIME_MINUTES}."
			_max_mtime_minutes="${DEFAULT_MTIME_MINUTES}"
			;;
		2 )
			_file="${1}"
			_max_mtime_minutes="${2}"
			;;
	esac

	## }}}

	## If the file exists
	if [ -f "${_file}" ]; then
		_current_timestamp=$(date "+%s")
		_file_mtime_timestamp=$(stat --format="%Y" -- "${_file}")

		## Substract last modification timestamp of the file to current timestamp
		: $(( _file_mtime_seconds=_current_timestamp-_file_mtime_timestamp ))
		## Get maximum allowed mtime in seconds
		: $(( _max_mtime_seconds=_max_mtime_minutes*60 ))

		## Compare last modification mtime with the maximum allowed
		if [ "${_file_mtime_seconds}" -gt "${_max_mtime_seconds}" ]; then
				debug_message "regenerate_if_too_old − \
Need to empty ${_file} last modification happened ${_file_mtime_seconds} seconds ago (maximum is ${_max_mtime_seconds})."
			true > "${_file}"
			chown -- "${XYMON_USERNAME}":"${XYMON_GROUPNAME}" "${_file}"
		else
				debug_message "regenerate_if_too_old − \
Don't need to empty ${_file} last modification happened ${_file_mtime_seconds} seconds ago (maximum is ${_max_mtime_seconds})."
		fi
	else ## Else if the file don't exists, just create it
		debug_message "regenerate_if_too_old − \
Need to create ${_file}."
		true > "${_file}"
	fi

}
# }}}
# Test if a file is empty {{{
is_file_empty() {
  _file_empty=$1

	if [ ! -s "${_file_empty}" ]; then
		debug_message "is_file_empty − \
${_file_empty} file is empty."
		return 0
	else
		debug_message "is_file_empty − \
${_file_empty} file is not empty."
		return 1
	fi

}
# }}}
# Get Maco update state {{{
get_maco_update() {

	maco_update_script_path="/opt/repos/ipr.scripts/cluster/maco.check.update.sh"
	maco_update_script_options="--simulate"

	## Run update_script and store result in PLUGIN_RESULT file
	debug_message "get_maco_update − \
Run \"${maco_update_script_path}\" script with \"${maco_update_script_options}\" options."
	sh "${maco_update_script_path}" "${maco_update_script_options}" >> "${PLUGIN_RESULT}"

}
# }}}
# Analyze maco result to define colors to send to Xymon {{{
analyze_maco_status() {

	debug_message "analyze_maco_status − \
Try to detect Maco update with ${PLUGIN_RESULT} content."

	if grep -qE '^Local.* up to date.*' "${PLUGIN_RESULT}"
	then
		echo "3&green Maco is uptodate" >> "${PLUGIN_STATE}"
	elif grep -qE '^Latest.* available.*' "${PLUGIN_RESULT}"
	then
		echo "2&yellow Maco needs upgrade" >> "${PLUGIN_STATE}"
	elif grep -qE '^Urgent.* available.*' "${PLUGIN_RESULT}"
	then
		echo "1&red Maco needs urgent upgrade" >> "${PLUGIN_STATE}"
	else
		echo "4&clear Maco update state is unknown" >> "${PLUGIN_STATE}"
	fi

}
# }}}
# Send plugin results to Xymon server {{{
send_result_to_xymon_server() {

	# Set the main color according to the highest alert
	COLOR=$(< "${PLUGIN_STATE}" awk '{print $1}' | sort | uniq | head -1 | cut -c3-)
	SUBJECT=$(< "${PLUGIN_STATE}" sort | uniq | head -1 | cut -d" " -f2-)

	# Send informations to Xymon server
	$XYMON "${XYMSRV}" "status ${MACHINE}.${TEST} ${COLOR} ${SUBJECT}

==================== Detailed status ====================

&${COLOR} $(cat ${PLUGIN_RESULT})"

	# For testing only
	#echo "$XYMON ${XYMSRV} status ${MACHINE}.${TEST} ${COLOR} ${SUBJECT}

#==================== Detailed status ====================

#&${COLOR} $(cat ${PLUGIN_RESULT})" > /tmp/xymon.maco.tmp

}
# }}}

main() {                                  # {{{

	# Create or empty previous file only if too old
	regenerate_if_too_old "${PLUGIN_RESULT}"
	regenerate_if_too_old "${PLUGIN_STATE}"

	# If previous result is empty
	## Re-check Maco update
	is_file_empty "${PLUGIN_RESULT}" \
		&& get_maco_update

	# If previous state is empty
	## analyze Maco's result
	is_file_empty "${PLUGIN_STATE}" \
		&& analyze_maco_status

	# Send data to Xymon server
	## and exit
	send_result_to_xymon_server \
		&& exit 0

}
# }}}

main

exit 255