#!/bin/sh
set -e

DEFAULT_REMOTE=""
if command -v lxc >/dev/null 2>&1; then
	DEFAULT_REMOTE=$(lxc remote list 2>/dev/null | awk 'NR>1 && $NF=="YES" {print $1; exit}')
fi
if [ -z "${DEFAULT_REMOTE}" ]; then
	DEFAULT_REMOTE="local"
fi

DEFAULT_VERSION="24.04"
DEFAULT_MEMORY_GIB="8"
DEFAULT_CPU="8"
DEFAULT_DISK_GIB="40"
DEFAULT_VM_NAME="my-vm"

INPUT="/dev/stdin"
if [ ! -t 0 ] && [ -r /dev/tty ]; then
	INPUT="/dev/tty"
fi

printf "Remote [%s]: " "${DEFAULT_REMOTE}"
read -r REMOTE < "${INPUT}"
REMOTE=${REMOTE:-${DEFAULT_REMOTE}}

printf "Ubuntu version [%s]: " "${DEFAULT_VERSION}"
read -r VERSION < "${INPUT}"
VERSION=${VERSION:-${DEFAULT_VERSION}}

printf "Memory (GiB) [%s]: " "${DEFAULT_MEMORY_GIB}"
read -r MEMORY_GIB < "${INPUT}"
MEMORY_GIB=${MEMORY_GIB:-${DEFAULT_MEMORY_GIB}}

printf "CPU cores [%s]: " "${DEFAULT_CPU}"
read -r CPU < "${INPUT}"
CPU=${CPU:-${DEFAULT_CPU}}

printf "Disk size (GiB) [%s]: " "${DEFAULT_DISK_GIB}"
read -r DISK_GIB < "${INPUT}"
DISK_GIB=${DISK_GIB:-${DEFAULT_DISK_GIB}}

printf "VM name [%s]: " "${DEFAULT_VM_NAME}"
read -r VM_NAME < "${INPUT}"
VM_NAME=${VM_NAME:-${DEFAULT_VM_NAME}}

echo "Launching ${VM_NAME} from ${REMOTE}:${VERSION}"
lxc launch "ubuntu:${VERSION}" "${REMOTE}:${VM_NAME}" --vm \
	-c "limits.cpu=${CPU}" \
	-c "limits.memory=${MEMORY_GIB}GiB" \
	-d "root,size=${DISK_GIB}GiB"