#!/bin/bash

set -eux

function usage() {
    echo "options:"
    echo "  -h   show usage and exit"
    echo "  -c   client bin name"
    echo "  -i   Optional: installation directory for the virtualenv."
    echo "       If not specified defaults to /opt/stack/venv/python-<client name>client"
    echo "  -s   enable --system-site-packages in the virtualenv."
    exit $1
}

client=""
install_dir=""
system_site_packages="False"


nshift=0
while getopts "hsi:c:" opt; do
    case "$opt" in
        c) client=$OPTARG;;
        i) install_dir=$OPTARG;;
        s) system_site_packages="True";;
        h) usage 0;;
        \?) usage 1;;
        :) usage 1;;
    esac
done

if [[ -z "$client" ]]; then
    echo "missing required 'client' parameter"
    exit 1
fi

repo=python-${client}client
if [ -z "$install_dir" ]; then
    install_dir="/opt/stack/venvs/$repo"
fi

# We would like to use --system-site-packages here but if requirements.txt
# contains libraries that are installed globally with versions that don't
# satisfy our requirements.txt, we end up using the incorrect global library.
# Because the global site-packages appears first in sys.path
# TODO : Add this back in when we are using virtualenv >= 1.11

SITE_PCKGS="--no-site-packages"
if [ $system_site_packages == "True" ]; then
    SITE_PCKGS="--system-site-packages"
fi

virtualenv $SITE_PCKGS $install_dir
set +u
source $install_dir/bin/activate
set -u

pushd /opt/stack/$repo
client_manifest=$(get-pip-manifest ${repo})
if [ -n "$client_manifest" ]; then
    use-pip-manifest $client_manifest
else
    # Need setuptools>=1.0 to manage connections when
    # downloading from pypi using http_proxy and https_proxy
    pip install -U 'setuptools>=1.0'

    # bug #1293812 : Avoid easy_install triggering on pbr.
    pip install -U 'pbr>=0.11,<2.0'

    if [ -e requirements.txt ]; then
        pip install -r requirements.txt
    elif [ -e tools/pip-requires ]; then
        pip install -r tools/pip-requires
    fi
fi

# Always replay this, as we cannot use the entry this would generate in the manifest
pip install .

# Write the manifest of what was installed
write-pip-manifest $repo

ln -s $install_dir/bin/$client /usr/local/bin/$client
popd

set +u
deactivate
set -u
