# This is the recipe.sh script. It is executed by BPM in a temporary directory when compiling a source package
# BPM Expects the source code to be extracted into the automatically created 'source' directory which can be accessed using $BPM_SOURCE
# BPM Expects the output files to be present in the automatically created 'output' directory which can be accessed using $BPM_OUTPUT

# The prepare function is executed in the root of the temp directory
# This function is used for putting downloaded files to the correct location or applying patches
prepare() {
  cd "$BPM_SOURCE"

  # Use the --oauth2-client-id= and --oauth2-client-secret= switches for
  # setting GOOGLE_DEFAULT_CLIENT_ID and GOOGLE_DEFAULT_CLIENT_SECRET at
  # runtime -- this allows signing into Chromium without baked-in values
  patch -Np1 -i "$BPM_WORKDIR"/use-oauth2-client-switches-as-default.patch

  # Fixes from Gentoo
  patch -Np1 -i "$BPM_WORKDIR"/chromium-138-nodejs-version-check.patch

  # Increase _FORTIFY_SOURCE level
  patch -Np1 -i "$BPM_WORKDIR"/increase-fortify-level.patch

  # Fix issue about missing compiler flag. Can be fixed by upgrading to LLVM 23
  # clang++: error: unknown argument: '-fsanitize-ignore-for-ubsan-feature=array-bounds'
  patch -Np1 -i "$BPM_WORKDIR"/chromium-149-drop-unknown-clang-flag.patch

  patch -Np1 -i "$BPM_WORKDIR"/chromium-147-rust-1.95-bytemuck.patch

  # Fixes unknown argument error
  patch -Np1 -i "$BPM_WORKDIR"/chromium-147-revert-clang-no-lifetime-dse-flag.patch 

  # https://crbug.com/456218403
  patch -Np1 -i "$BPM_WORKDIR"/chromium-145-fix-SYS_SECCOMP.patch

  patch -Np1 -i "$BPM_WORKDIR"/ungoogled-chromium-145-build-with-wasm-rollup.patch

  patch -Np1 -i "$BPM_WORKDIR"/dont_require_profiler_builtins.rlib.patch

  # Chromium bundles a patched minizip with extra features.
  patch -Np1 -i "$BPM_WORKDIR"/chromium-149-unbundle-minizip-undo-unicode.patch

  patch -Np1 -i "$BPM_WORKDIR"/chromium-149-use-of-undeclared-identifier-ERROR.patch

  # Credit: https://github.com/ungoogled-software/ungoogled-chromium/pull/3883
  patch -Np1 -i "$BPM_WORKDIR"/chromium-151-dont-depends-on-histograms.xml-if-it-is-not-git-checkout.patch

  # Fix issue about missing AVX functions
  # Credit: https://github.com/ungoogled-software/ungoogled-chromium/pull/3837
  patch -Np1 -i "$BPM_WORKDIR"/chromium-150-revert-avx-flag-change.patch

  # Allow building against system libraries in official builds
  sed -i 's/OFFICIAL_BUILD/GOOGLE_CHROME_BUILD/'  tools/generate_shim_headers/generate_shim_headers.py

  # Link to system tools required by the build
  mkdir -p third_party/node/linux/node-linux-x64/bin \
           third_party/rust-toolchain/bin \
           third_party/jdk/current/bin \
           third_party/dawn/tools/golang/linux-amd64/bin

  ln -s /usr/bin/node third_party/node/linux/node-linux-x64/bin/
  ln -s /usr/bin/rustc third_party/rust-toolchain/bin/
  ln -s /usr/bin/java third_party/jdk/current/bin/
  ln -s /usr/bin/go third_party/dawn/tools/golang/linux-amd64/bin/

  # Use system gperf binary
  rm -f third_party/gperf/cipd/bin/gperf
  ln -s /usr/bin/gperf third_party/gperf/cipd/bin/

  local _system_libs=(
    brotli
    flac
    fontconfig
    freetype
    harfbuzz
    libjpeg
    libwebp
    libxml
    libxslt
    opus
    zlib
  )

  # Remove bundled libraries for which we will use the system copies; this
  # *should* do what the remove_bundled_libraries.py script does, with the
  # added benefit of not having to list all the remaining libraries
  local _lib
  for _lib in "${_system_libs[@]//libjpeg/libjpeg_turbo}"; do
    find "third_party/$_lib" -type f \
      \! -path "third_party/$_lib/chromium/*" \
      \! -path "third_party/$_lib/google/*" \
      \! -path "third_party/harfbuzz-ng/utils/hb_scoped.h" \
      \! -regex '.*\.\(gn\|gni\|isolate\)' \
      -delete
  done

  ./build/linux/unbundle/replace_gn_files.py --system-libraries "${_system_libs[@]}"

  # Use correct libadler lib
  sed -i 's/rustc_nightly_capability = use_chromium_rust_toolchain/rustc_nightly_capability = true/' build/config/rust.gni
}

# The build function is executed in the source directory
# This function is used to compile the source code
build() {
  export CC=clang CXX=clang++ AR=ar NM=nm

  local _flags=(
    'custom_toolchain="//build/toolchain/linux/unbundle:default"'
    'host_toolchain="//build/toolchain/linux/unbundle:default"'
    'is_official_build=true' # implies is_cfi=true on x86_64
    'symbol_level=0' # sufficient for backtraces on x86(_64)
    'treat_warnings_as_errors=false'
    'fatal_linker_warnings=false'
    'disable_fieldtrial_testing_config=true'
    'blink_enable_generated_code_formatting=false'
    'ffmpeg_branding="Chrome"'
    'proprietary_codecs=true'
    'rtc_use_pipewire=true'
    'link_pulseaudio=true'
    'use_custom_libcxx=true' # https://github.com/llvm/llvm-project/issues/61705
    'use_sysroot=false'
    'use_system_libffi=true'
    'enable_hangout_services_extension=true'
    'enable_widevine=true'
    'use_qt5=false'
    'use_qt6=true'
    'moc_qt6_path="/usr/lib/qt6"'
    'use_clang_modules=false'
    'clang_base_path="/usr"'
    'clang_use_chrome_plugins=false'
    "clang_version=$(clang --version | grep -m1 version | sed 's/.* \([0-9]\+\).*/\1/')"
    'chrome_pgo_phase=0'
    'rust_sysroot_absolute="/usr"'
    'rust_bindgen_root="/usr"'
    "rustc_version=\"$(rustc --version | awk '{print $2 ;}')\""
  )

  export RUSTC_BOOTSTRAP=1

  # Make builds deterministic and ignore unknown option warnings
  export CFLAGS="${CFLAGS} -Wno-builtin-macro-redefined -Wno-unknown-warning-option"
  export CXXFLAGS="${CXXFLAGS} -Wno-builtin-macro-redefined -Wno-unknown-warning-option"
  export CPPFLAGS="${CPPFLAGS} -D__DATE__=  -D__TIME__=  -D__TIMESTAMP__="

  gn gen out/Release --args="${_flags[*]}"
  ninja -C out/Release chrome chrome_sandbox chromedriver.unstripped
}

# The package function is executed in the source directory
# This function is used to move the compiled files into the output directory
package() {
  install -Dm755 out/Release/chrome "$BPM_OUTPUT"/usr/lib/chromium/chromium
  install -Dm755 out/Release/chrome_crashpad_handler "$BPM_OUTPUT"/usr/lib/chromium/chrome_crashpad_handler
  install -Dm755 out/Release/chromedriver.unstripped "$BPM_OUTPUT"/usr/lib/chromium/chromedriver
  install -Dm755 out/Release/libEGL.so "$BPM_OUTPUT"/usr/lib/chromium/libEGL.so
  install -Dm755 out/Release/libGLESv2.so "$BPM_OUTPUT"/usr/lib/chromium/libGLESv2.so
  install -Dm755 out/Release/libvk_swiftshader.so "$BPM_OUTPUT"/usr/lib/chromium/libvk_swiftshader.so
  install -Dm755 out/Release/libvulkan.so.1 "$BPM_OUTPUT"/usr/lib/chromium/libvulkan.so.1
  install -Dm755 out/Release/vk_swiftshader_icd.json "$BPM_OUTPUT"/usr/lib/chromium/vk_swiftshader_icd.json
  install -Dm755 out/Release/libqt6_shim.so "$BPM_OUTPUT"/usr/lib/chromium/libqt6_shim.so
  install -Dm644 out/Release/icudtl.dat "$BPM_OUTPUT"/usr/lib/chromium/icudtl.dat
  install -Dm644 out/Release/locales/*.pak -t "$BPM_OUTPUT"/usr/lib/chromium/locales/
  install -Dm644 out/Release/*.bin -t "$BPM_OUTPUT"/usr/lib/chromium
  install -Dm644 out/Release/*.pak -t "$BPM_OUTPUT"/usr/lib/chromium

  # Install chromium launcher script
  install -Dm755 "$BPM_WORKDIR"/chromium.sh "$BPM_OUTPUT"/usr/bin/chromium

  # Create symbolic link to usr/bin
  ln -sf /usr/lib/chromium/chromedriver "$BPM_OUTPUT"/usr/bin/chromedriver

  # Install desktop icons
  for size in 24 48 64 128 256; do
    install -Dm644 chrome/app/theme/chromium/product_logo_${size}.png "$BPM_OUTPUT"/usr/share/icons/hicolor/${size}x${size}/apps/chromium.png
  done
  for size in 16 32; do
    install -Dm644 chrome/app/theme/default_100_percent/chromium/product_logo_${size}.png "$BPM_OUTPUT"/usr/share/icons/hicolor/${size}x${size}/apps/chromium.png
  done

  # Install desktop file
  install -Dm644 chrome/installer/linux/common/desktop.template "$BPM_OUTPUT"/usr/share/applications/chromium.desktop

  # Install man page
  install -Dm644 chrome/app/resources/manpage.1.in "$BPM_OUTPUT"/usr/share/man/man1/chromium.1

  # Replace placeholders in desktop file and man page
  sed -i \
    -e 's/@@MENUNAME/Chromium/g' \
    -e 's/@@PACKAGE/chromium/g' \
    -e 's/@@usr_bin_symlink_name/chromium/g' \
    -e 's|@@uri_scheme|x-scheme-handler/chromium;|g' \
    -e 's/@@extra_desktop_entries//g' \
    "$BPM_OUTPUT"/usr/share/applications/chromium.desktop \
    "$BPM_OUTPUT"/usr/share/man/man1/chromium.1

  # Install package license
  install -Dm644 "$BPM_SOURCE"/LICENSE "$BPM_OUTPUT"/usr/share/licenses/chromium/LICENSE
}