#!/bin/bash

set -ex

python_version() {
  python -V 2>&1
}

python3_version() {
  python3 -V 2>&1
}

openssl_version() {
  python -c "import ssl; print ssl.OPENSSL_VERSION"
}

desired_python3_version="3.6.4"
desired_python3_brew_version="3.6.4_2"
python3_formula="https://raw.githubusercontent.com/Homebrew/homebrew-core/b4e69a9a592232fa5a82741f6acecffc2f1d198d/Formula/python3.rb"

PATH="/usr/local/bin:$PATH"

if !(which brew); then
  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
fi

brew update > /dev/null

if !(python3_version | grep "$desired_python3_version"); then
  if brew list | grep python3; then
    brew unlink python3
  fi

  brew install "$python3_formula"
  brew switch python3 "$desired_python3_brew_version"
fi

echo "*** Using $(python3_version) ; $(python_version)"
echo "*** Using $(openssl_version)"

if !(which virtualenv); then
  pip install virtualenv
fi