#!/usr/bin/env bash
set -euo pipefail

[[ $# -eq 2 ]] || {
  echo "usage: build-native-bios-image.sh <world-root> <output-directory>" >&2
  exit 64
}

world_root=$(readlink -f "$1")
output_root=$(readlink -m "$2")
source_root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
native_root=${source_root}/native/x86_64-bios

command -v nasm >/dev/null
mkdir -p "${output_root}"
cargo run --quiet --manifest-path "${source_root}/Cargo.toml" \
  -p hldp-native-compiler -- "${world_root}" "${output_root}/world.inc"
(
  cd "${output_root}"
  nasm -f bin -I "${output_root}/" -I "${native_root}/" "${native_root}/boot.asm" \
    -o guanghu-os-x86_64-bios.img
)
[[ $(stat -c %s "${output_root}/guanghu-os-x86_64-bios.img") -eq 14848 ]]
sha256sum "${output_root}/guanghu-os-x86_64-bios.img" \
  >"${output_root}/guanghu-os-x86_64-bios.img.sha256"