#!/bin/bash

set -e

source $(dirname $0)/vars.sh

has_executable() {
    if [[ $# != 1 ]]; then
        echo "has_executable requires one argument" >&2
        return 1
    fi

    command -v $1 >/dev/null 2>/dev/null
}

setup_venv() {
    if [ ! -d ${VENV_DIR} ]; then
        echo "Setting up python environment in ${VENV_DIR}" >&2

        if has_executable python3; then
            python3 -m venv ${VENV_DIR}
        elif has_executable virtualenv; then
            virtualenv ${VENV_DIR}
        else
            echo "Cannot find virtualenv compatible system installed. This setup script will not automatically work. Ensure you can start a jupyter kernel with 'jupyter kernel'" >&2
            exit 1
        fi
    fi
}

install_jupyter() {
    if [ ! -f ${JUPYTER} ]; then
        echo "Installing jupyter to virtualenv" >&2

        ${PYTHON} -m pip install jupyter
    fi
}

main() {
    setup_venv
    install_jupyter
}

main