#!/usr/bin/env sh
#
# Author: Adrian Erik Hoemann
# Date: 9.18.2024
# 
# Dependencies:
# * qemu
# * sh
# * curl


# Debug mode
# To enable debug mode remove the comment.
# Default: OFF
#set +x

# Virtual machine settings
RAM="512M"
CPU="1"
DISK_SIZE="8G"

# Arguments
OPTION=$1
OS_NAME=$2
#DISK_SIZE=$3

# Defining paths
ISO_PATH="$ROOT_PATH/$OS_NAME/$OS_NAME.iso"
IMG_PATH="$ROOT_PATH/$OS_NAME/$OS_NAME.img"
ROOT_PATH="~/Machines"

# Defines install image repository.
case $OS_NAME in
  "openbsd")
    INSTALL_IMG="https://cdn.openbsd.org/pub/OpenBSD/7.5/i386/cd75.iso"
  ;;
  "debian")
    INSTALL_IMG=""
  ;;
esac

# Options
case $OPTION in
  # Initializes the VM and starts the installer image.
  "init")
    mkdir -p "$ROOT_PATH/$OS_NAME"
    qemu-img create $IMG_PATH $DISK_SIZE
    if [ ! -f $ISO_PATH ] && [ ! -z $INSTALL_IMG ]; then
      echo $INSTALL_IMG
      curl -o $ISO_PATH $INSTALL_IMG
    elif [ -z $INSTALL_IMG ]; then
      echo "Current INSTALL_IMG for $OS_NAME: $INSTALL_IMG"
    else:
      echo "ERROR: Enable debug mode by uncommenting: setx"
      exit 1
    fi
    qemu-system-x86_64 -boot d                    \
                      -display curses            \
                      -cdrom $ISO_PATH        \
                      -hda $IMG_PATH \
                      -m $RAM -smp $CPU
  ;;
  "console")
    qemu-system-x86_64 -boot c                    \
                       -display curses            \
                       -hda $IMG_PATH \
                       -m $RAM -smp $CPU
  ;;
  "start")
    qemu-system-x86_64 -boot c                    \
                       -hda $IMG_PATH \
                       -m $RAM -smp $CPU
  ;;
  *)
    echo "Usage: shemum [init] <virtual machine name> <disk size>"
    echo " init   	   initialize a virtual machine"
    echo " start       start a QEMU virtual machine"
    echo " console	   start a QEMU virtual machine"
esac