#!/bin/bash -ex
#
# script/brew_core_update
# mas
#
# Updates mas Homebrew core formula:
# https://github.com/Homebrew/homebrew-core/blob/master/Formula/mas.rb
#
# brew bump-formula-pr --help
#

CORE_TAP_PATH="$(brew --repository homebrew/core)"
CORE_MAS_FORMULA_FILE="${CORE_TAP_PATH}/Formula/m/mas.rb"

PROJECT_PATH="$(git rev-parse --show-toplevel)"
LOCAL_MAS_FORMULA_PATH="${PROJECT_PATH}/Homebrew/mas.rb"

function usage {
  echo "Usage: brew_core_update [-d] v0.0 [sha1_hash]"
  echo "  -d option enables dry run mode"
  echo "  version will be inferred using version script if not provided"
  echo "  sha will be inferred from the current commit if not provided"
  exit 1
}

# Max 3 arguments
if [[ $# -gt 3 ]]; then
  usage 1>&2
fi

echo=''
dry_run=''

# Detect presence of `-d` dry run option
while getopts "d" o; do
  case "${o}" in
    d)
      echo='echo (DRY-RUN):'
      dry_run='-d'
      ;;
    *)
      usage 1>&2
      ;;
  esac
done
shift $((OPTIND - 1))

# DRY_RUN environment variable
# shellcheck disable=SC2153
if [[ $DRY_RUN == 'true' ]]; then
  echo='echo (DRY-RUN):'
  dry_run='-d'
fi

# arg 1 - version tag
if [[ -n "${1}" ]]; then
  MAS_VERSION="${1}"
else
  MAS_VERSION="v$(script/version)"
fi

echo "MAS_VERSION: ${MAS_VERSION}"

# arg 2 - revision (commit hash)
if [[ -n "${2}" ]]; then
  REVISION="${2}"
else
  # Derive revision from version. Fails if MAS_VERSION is not a tag.
  REVISION=$(git rev-parse "${MAS_VERSION}")
fi

echo "REVISION: ${REVISION}"

################################################################################
#
# Preflight checks
#

# Uninstall if necessary
brew remove mas 2>/dev/null || true
brew remove mas-cli/tap/mas 2>/dev/null || true

# Uninstall if still found on path
if command -v mas >/dev/null; then
  script/uninstall || true
fi

# Ensure core is tapped
if ! [[ -d "${CORE_TAP_PATH}" ]]; then
  brew tap homebrew/core
fi

brew update

################################################################################
#
# Build the formula for the current macOS version and architecture.
#

# Update mas formula in core (temporary)
cp -v "${LOCAL_MAS_FORMULA_PATH}" "${CORE_MAS_FORMULA_FILE}"

# Install mas from source
# HOMEBREW_NO_INSTALL_FROM_API:
# Force brew to use the local repository instead of the API.
# Disable API before any install, reinstall or upgrade commands.

HOMEBREW_NO_INSTALL_FROM_API=1 \
  brew install mas \
  --build-from-source \
  --verbose

# Audit formula
brew audit --strict mas
brew style mas

# Revert core formula change after testing
pushd "${CORE_TAP_PATH}"
git diff
git checkout .
popd

################################################################################
#
# Update Homebrew
#

# echo "Checking to see if this update can be a simple bump."
# diff "${LOCAL_MAS_FORMULA_PATH}" "${CORE_MAS_FORMULA_FILE}"

echo "==> 🧪 Updating homebrew-core formula mas (${MAS_VERSION}, ${REVISION})"


echo "Validating formula"
brew bump-formula-pr \
  --tag="${MAS_VERSION}" \
  --revision="${REVISION}" \
  --strict \
  --verbose \
  --no-browse \
  --fork-org mas-cli \
  --dry-run \
  mas

# brew exit status
status=$?
if [[ ${status} -ne 0 ]]; then
  echo "Formula did not validate using 'brew bump-formula-pr'"
  exit ${status}
fi

if [[ $dry_run == '-d' ]]; then
  exit 0
fi

pushd "${CORE_TAP_PATH}"

echo "Updating homebrew/core formula with a PR"

$echo brew bump-formula-pr \
  --tag="${MAS_VERSION}" \
  --revision="${REVISION}" \
  --strict \
  --verbose \
  --online \
  --no-browse \
  --fork-org mas-cli \
  mas

popd