#!/usr/bin/env bash

set -eo pipefail

if [ $# -lt 1 ]; then
  echo "ERROR: Specify config path"
  exit 1
fi

CONFIG_PATH="${1}"

if [ ! -f "${CONFIG_PATH}/act-runner.bu" ]; then
  echo "ERROR: Config path ${CONFIG_PATH} must include the act-runner.bu file"
  exit 1
fi

NAME="${HOSTNAME}-act-runner"
STREAM="stable"
BUTANE_CONFIG="${CONFIG_PATH}/act-runner.bu"
VCPUS="8"
RAM_MB="16132"
DISK_GB="100"
SSH_KEY="${HOME}/.ssh/_${HOSTNAME}_act_runner_ed25519"

IGNITION_PATH="${CONFIG_PATH}/${NAME}.ign"
IMAGE_PATH="${CONFIG_PATH}/${NAME}.qcow2"
DOWNLOAD_PATH="$(mktemp -d)"
KVM="qemu:///session"

if ! systemctl is-active libvirtd --quiet; then
    systemctl start libvirtd
fi

all_vms=$(virsh --connect="${KVM}" list --all)

if [[ $all_vms == *"${NAME}"* ]]; then
    running_vms=$(virsh --connect="$KVM" list)
    if [[ $running_vms == *"${NAME}"* ]]; then
        echo "Shutting down VM ${NAME}..."
        virsh --connect="${KVM}" destroy "${NAME}"
    fi
    echo "Destroying VM ${NAME}..."
    virsh --connect="${KVM}" undefine --domain="${NAME}" --remove-all-storage --managed-save
    echo "Deleting image ${IMAGE_PATH}..."
    rm -rf "${IMAGE_PATH}"
    echo "Deleting ignition file ${IGNITION_PATH}..."
    rm "${IGNITION_PATH}"
fi

podman run \
  --rm \
  -v "${DOWNLOAD_PATH}:/data:z" \
  -w /data \
  quay.io/coreos/coreos-installer:release \
  download -s "${STREAM}" -p qemu -f qcow2.xz --decompress

download_image=$(command ls "${DOWNLOAD_PATH}"/*.qcow2)

mv "${download_image}" "${IMAGE_PATH}"

echo "${HOSTNAME}-act-runner" >"${CONFIG_PATH}/hostname"

if [ ! -f "${SSH_KEY}" ]; then
  ssh-keygen -q -f "${SSH_KEY}" -t ed25519 -C "${USERNAME}@${HOSTNAME}-act-runner" -N ''
fi
cp "${SSH_KEY}.pub" "${CONFIG_PATH}/core_ssh_keys.pub"

mkdir --parents "${CONFIG_PATH}/host_keys"

key_formats=(
  "rsa"
  "ed25519"
  "ecdsa"
)

for key in "${key_formats[@]}"; do
  if [ ! -f "${CONFIG_PATH}/host_keys/ssh_${key}" ]; then
    ssh-keygen -q \
      -f "${CONFIG_PATH}/host_keys/ssh_${key}" \
      -t "${key}" \
      -C "${HOSTNAME}-act-runner" \
      -N ''
  fi
done

podman run \
  --interactive \
  --rm \
  -v "${CONFIG_PATH}:/data:z" \
  quay.io/coreos/butane:release \
  --pretty --strict --files-dir=/data < "${BUTANE_CONFIG}" > "${IGNITION_PATH}"

chcon --verbose --type svirt_home_t "${IGNITION_PATH}"

virt-install \
  --connect="${KVM}" \
  --name="${NAME}" \
  --vcpus="${VCPUS}" \
  --memory="${RAM_MB}" \
  --os-variant="fedora-coreos-${STREAM}" \
  --import \
  --noautoconsole \
  --graphics=none \
  --disk="size=${DISK_GB},backing_store=${IMAGE_PATH}" \
  --network bridge=virbr0 \
  --qemu-commandline="-fw_cfg name=opt/com.coreos/config,file=${IGNITION_PATH}"