#!/usr/bin/env bash
# Assemble the pinned OBS runtime for Windows x64 from the official release zip.
#
# Files are copied byte-for-byte from the OBS release so the signed Game
# Capture hook (graphics-hook64.dll, inject-helper, get-graphics-offsets) keeps
# its original signature. Runs on Linux or Git Bash; needs curl, unzip and
# sha256sum.
set -euo pipefail

script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=versions.env
source "${script_dir}/versions.env"

cache_dir="${CLIPBIN_CACHE_DIR:-${XDG_CACHE_HOME:-$HOME/.cache}/clipbin}"
zip_name="OBS-Studio-${OBS_VERSION}-Windows-x64.zip"
zip_path="${cache_dir}/${zip_name}"
extract_dir="${cache_dir}/obs-windows-${OBS_VERSION}"
bundle_dir="${CLIPBIN_OBS_RUNTIME:-${script_dir}/../../target/obs-runtime/windows-x86_64}"

# Official plugins the recorder uses: Game/Window Capture, WASAPI audio,
# hardware encoders (AMF lives in obs-ffmpeg) and the FFmpeg muxer.
plugins=(win-capture win-wasapi obs-ffmpeg obs-nvenc obs-qsv11)
# OBS front-end, scripting and software-encoder files Clipbin does not use.
# Subdirectories of bin/64bit are Qt plugins and are skipped too.
excluded_bin='^(obs64\.exe|obs-frontend-api\.dll|obs-scripting\.dll|lua51\.dll|Qt6.*\.dll|datachannel\.dll|libx264-.*\.dll|.*\.pdb)$'

mkdir -p "${cache_dir}"
if [[ ! -f "${zip_path}" ]]; then
    curl -fL --retry 3 -o "${zip_path}.partial" \
        "https://github.com/obsproject/obs-studio/releases/download/${OBS_VERSION}/${zip_name}"
    mv "${zip_path}.partial" "${zip_path}"
fi
echo "${OBS_WINDOWS_X64_SHA256}  ${zip_path}" | sha256sum --check --quiet

rm -rf "${extract_dir}"
unzip -q "${zip_path}" -d "${extract_dir}"

# Keep the OBS install layout: OBS looks for obs-ffmpeg-mux.exe next to the
# running executable, so Clipbin's executable lives in bin/64bit.
rm -rf "${bundle_dir}"
mkdir -p "${bundle_dir}/bin/64bit" "${bundle_dir}/obs-plugins/64bit" "${bundle_dir}/data/obs-plugins"
for file in "${extract_dir}"/bin/64bit/*; do
    name="$(basename "${file}")"
    if [[ -f "${file}" && ! "${name}" =~ ${excluded_bin} ]]; then
        cp -a "${file}" "${bundle_dir}/bin/64bit/"
    fi
done
cp -a "${extract_dir}/data/libobs" "${bundle_dir}/data/libobs"
for plugin in "${plugins[@]}"; do
    cp -a "${extract_dir}/obs-plugins/64bit/${plugin}.dll" "${bundle_dir}/obs-plugins/64bit/"
    if [[ -d "${extract_dir}/data/obs-plugins/${plugin}" ]]; then
        cp -a "${extract_dir}/data/obs-plugins/${plugin}" "${bundle_dir}/data/obs-plugins/"
    fi
done
find "${bundle_dir}" -name '*.pdb' -delete

# Record the signed capture-hook files so a Windows check can verify them
# against Get-AuthenticodeSignature before packaging.
(cd "${bundle_dir}" && sha256sum data/obs-plugins/win-capture/*.exe data/obs-plugins/win-capture/*.dll) \
    > "${bundle_dir}/SIGNED-HOOKS.sha256"

cat > "${bundle_dir}/VERSION" <<EOF
obs=${OBS_VERSION}
source=${zip_name}
sha256=${OBS_WINDOWS_X64_SHA256}
plugins=${plugins[*]}
EOF
echo "OBS ${OBS_VERSION} Windows runtime assembled in ${bundle_dir}"