#!/usr/bin/env bash

set -eo pipefail

if [[ -n "$1" ]] && [[ -z "$VMNAME" ]]; then
    VMNAME="$1"
fi

if [[ -z "$VMNAME" ]]; then
    echo "VMNAME not specified, aborting" >&2
    exit 1
fi

if [[ -z "$DEBUG" ]]; then
    DEBUG=
fi

set -u

SUDO=sudo

$SUDO true

NET_CONF_FILE="$(sudo mktemp)"

# create bridge
NET_CONF_FILE="$NET_CONF_FILE" $DEBUG $SUDO --preserve-env=NET_CONF_FILE \
    ./net create

# rebind devices
for device in $(< vfio_devices.txt); do
    $DEBUG $SUDO ./pci vfio_rebind_device "$device"
done

# efi variables
EFI_VARS="$(mktemp)"
cp /usr/share/ovmf/x64/OVMF_VARS.fd "$EFI_VARS"
EFI_FIRMWARE=/usr/share/ovmf/x64/OVMF_CODE.fd

base_path=base
default_path=default
hardware_path=hardware
specific_path="$VMNAME"
if [[ -e "$base_path.conf.tmpl" ]]; then
    (
        # shellcheck disable=SC1090
        [[ -e "$base_path.sh" ]] && source "$base_path.sh"
        envsubst < "$base_path.conf.tmpl" > "$base_path.conf"
    )
fi
if [[ -e "$default_path.conf.tmpl" ]]; then
    (
        # shellcheck disable=SC1090
        [[ -e "$default_path.sh" ]] && source "$default_path.sh"
        envsubst < "$default_path.conf.tmpl" > "$default_path.conf"
    )
fi
if [[ -e "$hardware_path.conf.tmpl" ]]; then
    (
        # shellcheck disable=SC1090
        [[ -e "$hardware_path.sh" ]] && source "$hardware_path.sh"
        envsubst < "$hardware_path.conf.tmpl" > "$hardware_path.conf"
    )
fi
if [[ -e "$specific_path.conf.tmpl" ]]; then
    (
        # shellcheck disable=SC1090
        [[ -e "$specific_path.sh" ]] && source "$specific_path.sh"
        envsubst < "$specific_path.conf.tmpl" > "$specific_path.conf"
    )
fi

if [[ -e "pre-start.sh" ]]; then
    ./pre-start.sh
fi

if [[ -e "pre-start-$VMNAME.sh" ]]; then
    ./"pre-start-$VMNAME.sh"
fi

# run qemu
base_arguments=()
default_arguments=()
hardware_arguments=()
specific_arguments=()
# mask EOF
read -ra base_arguments -d '' < "$base_path.conf" || true
read -ra default_arguments -d '' < "$default_path.conf" || true
read -ra hardware_arguments -d '' < "$hardware_path.conf" || true
read -ra specific_arguments -d '' < "$specific_path.conf" || true
$DEBUG $SUDO nice --adjustment=-20 taskset --cpu-list '1-5,7-11' \
    qemu-system-x86_64 \
    -name "$VMNAME,process=VMNAME" \
    -drive if=pflash,format=raw,readonly=on,file="$EFI_FIRMWARE" \
    -drive if=pflash,format=raw,file="$EFI_VARS" \
    "${base_arguments[@]}" \
    "${default_arguments[@]}" \
    "${hardware_arguments[@]}" \
    "${specific_arguments[@]}"

NET_CONF_FILE="$NET_CONF_FILE" $DEBUG $SUDO --preserve-env=NET_CONF_FILE \
    ./net delete