#!/bin/bash
#python-venv-prepare.sh

_BASE_DIR="${PWD##*/}"

if [ $# -eq 0 ]; then
  echo "Usage: ./python-venv-prepare.sh [2.7|3.7]"
  exit 1
fi

while [ $# -ne 0 ]
do
    arg="$1"
    case "$arg" in
        2.7)
            _PYTHON_VER=2.7
            ;;
        3.7)
            _PYTHON_VER=3.7
            ;;
        *)
            echo "Wrong param provided"
            echo "Usage: ./duplicati.sh [start|stop]"
            exit 1
            ;;
    esac
    shift
done
echo "--------------------------------------------------------------------------------------"
_VENV_DIR="${_BASE_DIR}_venv-${_PYTHON_VER}"
chmod 755 create-${_PYTHON_VER}.sh>create-${_PYTHON_VER}.sh && echo "virtualenv -p /usr/bin/python${_PYTHON_VER} '${_VENV_DIR}'" >create-${_PYTHON_VER}.sh
chmod 755 activate-${_PYTHON_VER}.sh>activate-${_PYTHON_VER}.sh

_PYTHON_INSTALLED=false
dpkg -s "python${_PYTHON_VER}" &> /dev/null
if [ $? -eq 0 ]; then
    _PYTHON_INSTALLED=true
    echo "[$(date +%Y%m%d_%H-%M-%S)] python${_PYTHON_VER} already installed. Skipping"
fi

if [ "${_PYTHON_VER}" == "2.7" ]; then
  if ! "${_PYTHON_INSTALLED}"; then
  	sudo apt-get install -y python${_PYTHON_VER}
    sudo pip2 install virtualenv
    echo "[$(date +%Y%m%d_%H-%M-%S)] python/pip/venv Installation Completed"
  fi
  echo "source '${_VENV_DIR}'/bin/activate" >activate-${_PYTHON_VER}.sh
elif [ "${_PYTHON_VER}" == "3.7" ]; then
  if ! "${_PYTHON_INSTALLED}"; then
    #sudo apt-get install -y python3.7-pip
    sudo apt install -y "python${_PYTHON_VER}" "python${_PYTHON_VER}-venv"
    sudo pip3 install virtualenv
    echo "[$(date +%Y%m%d_%H-%M-%S)] Python/pip/venv Installation Completed"
  fi
  echo "source '${_VENV_DIR}'/bin/activate" >activate-${_PYTHON_VER}.sh
else
  echo "[$(date +%Y%m%d_%H-%M-%S)]  ERROR"
  exit 997
fi

echo "[$(date +%Y%m%d_%H-%M-%S)] create-${_PYTHON_VER}.sh script created and ready to use. Launching"
./create-${_PYTHON_VER}.sh
echo "[$(date +%Y%m%d_%H-%M-%S)] Please run the following command to activate your new venv:"
echo "source '${_VENV_DIR}'/bin/activate"