#!/usr/bin/env bash
set -Eeuo pipefail

DEF_OPTS="-nodefaults -boot strict=on"
RAM_OPTS=$(echo "-m ${RAM_SIZE^^}" | sed 's/MB/M/g;s/GB/G/g;s/TB/T/g')
CPU_OPTS="-cpu $CPU_FLAGS -smp $CPU_CORES,sockets=1,dies=1,cores=$CPU_CORES,threads=1"
MAC_OPTS="-machine type=q35,usb=off,vmport=off,dump-guest-core=off,hpet=off${KVM_OPTS}"
DEV_OPTS="-device virtio-balloon-pci,id=balloon0,bus=pcie.0,addr=0x4"
DEV_OPTS="$DEV_OPTS -object rng-random,id=objrng0,filename=/dev/urandom"
DEV_OPTS="$DEV_OPTS -device virtio-rng-pci,rng=objrng0,id=rng0,bus=pcie.0,addr=0x1c"

ARGS="$DEF_OPTS $CPU_OPTS $RAM_OPTS $MAC_OPTS $DISPLAY_OPTS $MON_OPTS $SERIAL_OPTS $NET_OPTS $DISK_OPTS $DEV_OPTS $ARGUMENTS"
ARGS=$(echo "$ARGS" | sed 's/\t/ /g' | tr -s ' ')

# Check available memory as the very last step

RAM_AVAIL=$(free -b | grep -m 1 Mem: | awk '{print $7}')
AVAIL_GB=$(( (RAM_AVAIL + 1073741823)/1073741824 ))

if (( (RAM_WANTED + 500000000) > RAM_AVAIL )); then
  error "Your configured RAM_SIZE of $WANTED_GB GB is higher than the $AVAIL_GB GB of memory available, please set a lower value."
  exit 17
fi

if (( (RAM_WANTED + 1450000000) > RAM_AVAIL )); then
  warn "your configured RAM_SIZE of $WANTED_GB GB is much too close to the $AVAIL_GB GB of memory available, please set a lower value."
fi

return 0