#!/bin/bash
# $1 Full path to the installer (unused)
# $2 Location of the Homebrew installation we may need to move into place
# $3 Target install location (unused)
# $4 System root directory (unused)
set -euo pipefail

# disable analytics while installing
export HOMEBREW_NO_ANALYTICS_THIS_RUN=1
export HOMEBREW_NO_ANALYTICS_MESSAGE_OUTPUT=1

# verify the installation exists
# default to /opt/homebrew to make development/testing easier
homebrew_directory="${2:-/opt/homebrew}"
if [[ ! -d "${homebrew_directory:?}" ]]
then
  echo "no directory at ${homebrew_directory}!" >&2
  exit 1
fi

# add Git to path
export PATH="/Library/Developer/CommandLineTools/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:${PATH}"

# reset Git repository
cd "${homebrew_directory}"
git config --global --add safe.directory "${homebrew_directory}"
git reset --hard
git checkout --force master
git branch | grep -v '\*' | xargs -n 1 git branch --delete --force || true
git config --global --unset safe.directory "${homebrew_directory}"

# move to /usr/local if on x86_64
if [[ $(uname -m) == "x86_64" ]]
then
  if [[ -f "/usr/local/bin/brew" && -d "/usr/local/Homebrew" ]]
  then
    cp -pRL "${homebrew_directory}/.git" "/usr/local/Homebrew/"
    mv "${homebrew_directory}/cache_api" "/usr/local/Homebrew/"
    git -C /usr/local/Homebrew reset --hard
    git -C /usr/local/Homebrew checkout --force master
  else
    mkdir -vp /usr/local/bin
    mv "${homebrew_directory}" "/usr/local/Homebrew/"

    # create symlink to /usr/local/bin/brew
    ln -svf "../Homebrew/bin/brew" "/usr/local/bin/brew"
  fi

  rm -rf "${homebrew_directory}"
  homebrew_directory="/usr/local/Homebrew"
  cd /usr/local
fi

# create missing directories
mkdir -vp Cellar Frameworks etc include lib opt sbin share var/homebrew/linked

# set permissions
logged_in_user=$(echo "show State:/Users/ConsoleUser" | scutil | awk '/Name :/ { print $3 }')
group=$(id -gn "${logged_in_user}")
if [[ "${homebrew_directory}" == "/usr/local/Homebrew" ]]
then
  chown -R "${logged_in_user}:${group}" Cellar Frameworks Homebrew bin etc include lib sbin share var/homebrew/linked
else
  chown -R "${logged_in_user}:${group}" .
fi

# move API cache to ~/Library/Caches/Homebrew
user_api_cache_dir=~"${logged_in_user}"/Library/Caches/Homebrew/api
mkdir -vp "${user_api_cache_dir}"
mv -v "${homebrew_directory}/cache_api/"* "${user_api_cache_dir}"
rm -vrf "${homebrew_directory}/cache_api"