#!/bin/bash -eu

getmaxram() {
    local ram; ram="$(free -g | awk '/^Mem:/{print $2 - 2}')"

    if   [ "$ram" -le  2 ]; then  ram=2
    elif [ "$ram" -gt 32 ]; then ram=32; fi
    echo "${ram}G"
}

ISO="$1"; shift
DISK="$HOME/${ISO%.*}.qcow2"
MAXMEM="$(getmaxram)"

if ! [ -f "$DISK" ]; then (set -x
    qemu-img create -f qcow2 "$DISK" 64G
) fi
(set -x
qemu-system-x86_64 \
    -accel   kvm \
    -M       q35 \
    -bios    /usr/share/edk2/x64/OVMF.4m.fd \
    -monitor stdio \
    -cpu     host \
    -m       "2G,maxmem=$MAXMEM" \
    -vga     virtio \
    -audio   pipewire,model=hda \
    -nic     model=virtio-net-pci,type=user \
    -device  qemu-xhci \
    -object  "memory-backend-ram,id=mem,size=2G,share=on" \
    -numa    node,memdev=mem \
    -drive   "if=virtio,file=$DISK" \
    -drive   "file=$ISO,media=cdrom,readonly=on" \
    "$@"
)