#!/bin/bash

if [[ -z $OUTPUT_DIR ]] ; then
	source scan-dmidecode
fi

cat /proc/meminfo > $OUTPUT_DIR/meminfo

MEM_RESERVED=64 #MB
MEM_AVAILABLE=`cat /proc/meminfo \
	| grep '^MemAvailable' \
	| grep 'kB' \
	| cut -d ':' -f 2 \
	| sed 's/[^0-9]\+//g'`
#echo "MEM_AVAILABLE: $MEM_AVAILABLE"
#MEM_AVAILABLE=
if [[ -z $MEM_AVAILABLE ]] ; then
	MEM_FREE=`cat /proc/meminfo \
		| grep '^MemFree:' \
		| grep 'kB' \
		| cut -d ':' -f 2 \
		| sed 's/[^0-9]\+//g'`
	MEM_BUFF=`cat /proc/meminfo \
		| grep '^Buffers:' \
		| grep 'kB' \
		| cut -d ':' -f 2 \
		| sed 's/[^0-9]\+//g'`
	MEM_RECL=`cat /proc/meminfo \
		| grep '^SReclaimable:' \
		| grep 'kB' \
		| cut -d ':' -f 2 \
		| sed 's/[^0-9]\+//g'`
	MEM_SHM=`cat /proc/meminfo \
		| grep '^Shmem:' \
		| grep 'kB' \
		| cut -d ':' -f 2 \
		| sed 's/[^0-9]\+//g'`
	MEM_CACH=`cat /proc/meminfo \
		| grep '^Cached:' \
		| grep 'kB' \
		| cut -d ':' -f 2 \
		| sed 's/[^0-9]\+//g'`
	if [[ -z $MEM_FREE ]] ; then
		echo "Error: Could not parse /proc/meminfo for MemFree" >&2
		exit 4
	fi
	if [[ -z $MEM_BUFF ]] ; then
		echo "Error: Could not parse /proc/meminfo for Buffers" >&2
		exit 5
	fi
	if [[ -z $MEM_RECL ]] ; then
		echo "Could not parse /proc/meminfo for SReclaimable" >&2
		MEM_RECL=0
	fi
	if [[ -z $MEM_SHM ]] ; then
		echo "Could not parse /proc/meminfo for Shmem" >&2
		MEM_SHM=0
	fi
	if [[ -z $MEM_CACH ]] ; then
		echo "Error: Could not parse /proc/meminfo for Cached" >&2
		exit 6		
	fi
	echo "MEM_FREE: $MEM_FREE"
	echo "MEM_BUFF: $MEM_BUFF"
	echo "MEM_RECL: $MEM_RECL"
	echo "MEM_SHM: $MEM_SHM"
	echo "MEM_CACH: $MEM_CACH"
#	MEM_AVAILABLE=$(( MEM_FREE + MEM_BUFF + MEM_CACH ))
#	echo "MEM_AVAILABLE: $MEM_AVAILABLE"
	MEM_AVAILABLE=$(( MEM_FREE + MEM_RECL - MEM_SHM + MEM_CACH ))
#	echo "MEM_AVAILABLE: $MEM_AVAILABLE"
fi
echo "MEM_AVAILABLE: $MEM_AVAILABLE"
if [[ -z $MEM_AVAILABLE ]] ; then
	echo "Error: Could not parse /proc/meminfo for available memory" >&2
	exit 2
fi
MEM_TESTABLE=$(( MEM_AVAILABLE - (MEM_RESERVED * 1024) ))
if (( $MEM_TESTABLE < 1024 )) ; then
	echo "Testable memory $MEM_TESTABLE lower than 1 MB. Exiting" >&2
	exit 3
fi
# TODO: Hardcoded values for Debug. Please comment them out for production.
# Hardcoded 13 GiB for debug
#MEM_TESTABLE=13631488
# Hardcoded 13 MiB for debug
#MEM_TESTABLE=16384
# Hardcoded 130 MiB for debug
#MEM_TESTABLE=163840
export MEM_TESTABLE

echo "$MEM_AVAILABLE kB available in system"
echo "$MEM_TESTABLE kB usable for memtester"