#! /bin/bash


# Creates virtual environments for development using the Python executables in $ENV_LIST. 
# Existing environments are recreated.


PIP="pip"
VIRTUALENV="virtualenv"
PYVENV="pyvenv"
# I create virtual environments for all supported versions in case tox tells me that 
# a test fails in some Python versions.
PYVERSIONS="2.6 2.7 3.3 3.4"
ENV_EXT="venv"


for VERSION in $PYVERSIONS;
    do
    # check to see whether there is a python of this version installed.
    if hash python$VERSION 2> /dev/null; then
        # look for pyvenv; it should be available for $VERSION >= '3.3.
        VENV="$PYVENV-$VERSION"
        if ! hash "$VENV" 2> /dev/null; then
            #not found, so fall back to virtualenv.
            VENV="$VIRTUALENV"
            VENV_ARGS="--python=python$VERSION --clear "
        else
            VENV_ARGS="--clear"
        fi
        if hash "$VENV" 2> /dev/null; then
            ENV_DIR="python$VERSION.$ENV_EXT"
            #echo "Creating directory $ENV_DIR"
            #rm -rf "$ENV_DIR"
            #mkdir "$ENV_DIR"
            echo "Initializing virtualenv."
            "$VENV" $VENV_ARGS "$ENV_DIR"
            source "$ENV_DIR/bin/activate"
        
            #check for pip install in this virtual environment.
            if [[ ! -x $VIRTUAL_ENV/bin/pip ]]; then
                echo "pip is not included in this virtual environment. Installing pip."
                if [[ ! -f get-pip.py ]]; then
                    curl -o get-pip.py https://bootstrap.pypa.io/get-pip.py
                fi
                python get-pip.py   
            fi
        
            echo "Installing this package."
            pip install --process-dependency-links  --editable .
            echo "Installing additional packages from requirements.txt."
            pip install -r requirements.txt
            deactivate
        fi
    else
        echo "python$VERSION is not installed. Skipping virtual enviroment creation."
    fi
done
rm -f get-pip.py