#!/bin/sh
# Download and extract the wireless dongle firmware from Windows Update.
# Port of install/firmware.sh from medusalix/xone.
#
# The firmware is subject to Microsoft's Terms of Use:
# https://www.microsoft.com/en-us/legal/terms-of-use

set -eu

cd "$(dirname "$0")/.."

firmware_url='http://download.windowsupdate.com/c/msdownload/update/driver/drvs/2017/07/1cd6a87c-623f-4407-a52d-c31be49e925c_e19f60808bdcbfbd3c3df6be3e71ffc52e43261e.cab'
firmware_hash='48084d9fa53b9bb04358f3bb127b7495dc8f7bb0b3ca1437bd24ef2b6eabdf66'

echo "The firmware for the wireless dongle is subject to Microsoft's Terms of Use:"
echo 'https://www.microsoft.com/en-us/legal/terms-of-use'
echo
echo 'Press enter to continue!'
read -r _

command -v curl >/dev/null 2>&1 || { echo 'This script requires curl!' >&2; exit 1; }

sha256() {
    if command -v sha256sum >/dev/null 2>&1; then
        sha256sum "$1" | cut -d' ' -f1
    else
        shasum -a 256 "$1" | cut -d' ' -f1
    fi
}

tmpdir=$(mktemp -d)
trap 'rm -rf "$tmpdir"' EXIT INT HUP TERM

fetch_firmware() {
    # fetch_firmware <url> <sha256> <output name>
    url=$1
    hash=$2
    outname=$3

    echo "Downloading $outname..."
    curl -L --fail -o "$tmpdir/driver.cab" "$url"

    # Extract the firmware image (requires a libarchive-based tar, e.g. macOS).
    tar -xf "$tmpdir/driver.cab" -C "$tmpdir"

    actual=$(sha256 "$tmpdir/FW_ACC_00U.bin")
    if [ "$actual" != "$hash" ]; then
        echo "Firmware hash mismatch: $actual" >&2
        exit 1
    fi

    mkdir -p firmware
    mv "$tmpdir/FW_ACC_00U.bin" "firmware/$outname"
    echo "Firmware written to firmware/$outname"
}

fetch_firmware "$firmware_url" "$firmware_hash" xow_dongle.bin