#!/bin/zsh
set -e

print_help() {
    cat <<EOF
To build a universal pkg for macOS:
  script/pkgmacos <tag-name>

To build and sign set APPLE_DEVELOPER_INSTALLER_ID environment variable before.
For example, if you have a signing identity with the identifier 
"Developer ID Installer: Your Name (ABC123DEF)" set it in the variable.
EOF
}

if [ $# -eq 0 ]; then
  print_help >&2
  exit 1
fi

tag_name=""

while [ $# -gt 0 ]; do
  case "$1" in
  -h | --help )
    print_help
    exit 0
    ;;
  -* )
    printf "unrecognized flag: %s\n" "$1" >&2
    exit 1
    ;;
  * )
    tag_name="${1#v}"
    shift 1
    ;;
  esac
done

# check os requirements: is running macOS 12+ and pkgbuild + productbuild are available
os_version=$(sw_vers -productVersion)
major_version=${os_version%%.*}

if (( major_version < 12 )); then
  echo "This script requires macOS 12 or later. You are running macOS ${os_version}." >&2
  exit 1
fi

if ! command -v pkgbuild &> /dev/null; then
  echo "pkgbuild could not be found. Please install Xcode Command Line Tools." >&2
  exit 1
fi

if ! command -v productbuild &> /dev/null; then
  echo "productbuild could not be found. Please install Xcode Command Line Tools." >&2
  exit 1
fi
# end of os requirements check

# gh-binary paths
bin_path="/bin/gh"
arm64_bin="./dist/macos_darwin_arm64$bin_path"
amd64_bin="./dist/macos_darwin_amd64_v1$bin_path"
# payload paths
payload_root="pkg_payload"
payload_local_bin="${payload_root}/usr/local/bin"
payload_zsh_site_functions="${payload_root}/usr/local/share/zsh/site-functions"
payload_man1="${payload_root}/usr/local/share/man/man1"

merge_binaries() {
    lipo -create -output "${payload_local_bin}/gh" "$arm64_bin" "$amd64_bin"
}

build_pkg() {
  # setup payload
  mkdir -p "${payload_local_bin}"
  mkdir -p "${payload_man1}"
  mkdir -p "${payload_zsh_site_functions}"

  # copy man pages
  for file in ./share/man/man1/gh*.1; do
    cp "$file" "${payload_man1}"
  done
  # Include only Zsh completions,
  # the recommended/only option on macOS since Catalina for default shell.
  cp "./share/zsh/site-functions/_gh" "${payload_zsh_site_functions}"

  # merge binaries
  merge_binaries

  # build pkg
  pkgbuild \
    --root "$payload_root" \
    --identifier "com.github.cli" \
    --version "$tag_name" \
    --install-location "/" \
    "./dist/com.github.cli.pkg"

  # setup resources
  mkdir -p "./build/macOS/resources"
  cp "LICENSE" "./build/macOS/resources"

  PRODUCTBUILD_ARGS=()

  # include signing if developer id is set
  if [ -n "$APPLE_DEVELOPER_INSTALLER_ID" ]; then
    PRODUCTBUILD_ARGS+=("--timestamp")
    PRODUCTBUILD_ARGS+=("--sign")
    PRODUCTBUILD_ARGS+=("${APPLE_DEVELOPER_INSTALLER_ID}")
  else
    echo "skipping macOS pkg code-signing; APPLE_DEVELOPER_INSTALLER_ID not set" >&2
  fi

  # build distribution
  productbuild \
    --distribution "./build/macOS/distribution.xml" \
    --resources "./build/macOS/resources" \
    --package-path "./dist" \
    "${PRODUCTBUILD_ARGS[@]}" \
    "./dist/gh_${tag_name}_macOS_universal.pkg"
}

cleanup() {
  # remove temp installer so it does not get uploaded
  rm -f "./dist/com.github.cli.pkg"
}

trap cleanup EXIT

build_pkg