#!/bin/bash
ARGS=""
KERNEL="-kernel cmake-build-debug/my-kernel.bin"
NOHUP=0

function print_help() {
  cat <<EOF
Usage: $0 [OPTION]...

Options:
 -h, --help               Print help info
 -d, --debug              Start qemu with halted cpu and GDB port 1234 open. Also print guest errors and interrupts
 -i [disk], --ide [disk]  Use [disk] as a hda on an IDE bus
 -n, --nohup              Run QEMU using nohup and output to /dev/null
 -m, --max-cpu            Run qemu with -m max
 --net                    Launch the kernel using TFTP. (Requires GRUB to be set up)
EOF
}

while [[ "$#" -gt 0 ]]; do
  key=$1
  case $key in
  -d | --debug)
    ARGS="${ARGS} -S -s -d guest_errors,int"
    shift
    ;;
  --net)
    cp cmake-build-debug/my-kernel.bin netdir/my-kernel.bin
    KERNEL="-netdev user,id=n0,tftp=netdir,bootfile=/boot/grub/i386-pc/core.0 -device e1000,netdev=n0,bootindex=1"
    shift
    ;;
  -i | --ide)
    ARGS="${ARGS} -hda $2"
    shift 2
    ;;
  -s | --sata)
    ARGS="${ARGS} -drive id=disk1,file=$2,if=none -device ahci,id=ahci -device ide-drive,drive=disk1,bus=ahci.0"
    shift 2
    ;;
  -m | --max-cpu)
    ARGS="${ARGS} -cpu max"
    shift
    ;;
  -n | --nophup)
    NOHUP=1
    shift
    ;;
  -h | --help)
    print_help
    exit
    ;;
  esac
done

echo "Launching with args ${ARGS} ${KERNEL}"

if [ "$NOHUP" -gt 0 ]; then
  # shellcheck disable=SC2086
  nohup qemu-system-i386 ${ARGS} ${KERNEL} >/dev/null &
  disown
else
  # shellcheck disable=SC2086
  qemu-system-i386 ${ARGS} ${KERNEL}
fi