set +e

# Fix any pending whitespace around runtime.txt.
runtime-fixer runtime.txt

PYTHON_VERSION=$(cat runtime.txt)

# Install Python.
if [ -f .heroku/python-version ]; then
  if [ ! $(cat .heroku/python-version) = $PYTHON_VERSION ]; then
    puts-step "Found $(cat .heroku/python-version), removing"
    rm -fr .heroku/python
  else
    SKIP_INSTALL=1
  fi
fi

if [ ! $STACK = $CACHED_PYTHON_STACK ]; then
  rm -fr .heroku/python .heroku/python-stack .heroku/vendor
  unset SKIP_INSTALL
fi


if [ ! "$SKIP_INSTALL" ]; then
    puts-step "Installing $PYTHON_VERSION"

    # Prepare destination directory.
    mkdir -p .heroku/python

    curl https://lang-python.s3.amazonaws.com/$STACK/runtimes/$PYTHON_VERSION.tar.gz -s | tar zxv -C .heroku/python &> /dev/null
    if [[ $? != 0 ]] ; then
      puts-warn "Requested runtime ($PYTHON_VERSION) is not available for this stack ($STACK)."
      puts-warn "Aborting.  More info: https://devcenter.heroku.com/articles/python-support"
      exit 1
    fi

  # Record for future reference.
  echo $PYTHON_VERSION > .heroku/python-version
  echo $STACK > .heroku/python-stack
  FRESH_PYTHON=true

  hash -r
fi

# If Pip isn't up to date:
if [ "$FRESH_PYTHON" ] || pip list -o --format=legacy --disable-pip-version-check | grep '^pip' 2>&1 /dev/null; then

  # TODO: automatically detect pip is out of date with 'pip list -o --format=legacy --disable-pip-version-check | grep '^pip''
  WORKING_DIR=$(pwd)

  TMPTARDIR=$(mktemp -d)
  trap "rm -rf $TMPTARDIR" RETURN

  puts-step "Installing pip"
  /app/.heroku/python/bin/python $ROOT_DIR/vendor/get-pip.py | indent
  /app/.heroku/python/bin/pip install setuptools --upgrade &> /dev/null


fi

set -e
hash -r