#!/bin/bash

set +e

# function finds python2
function find_python2 {

    if [ -n "$PYTHON" ]; then #  
        return;
    fi

    # try different Python paths
    PYTHONS=( python /usr/bin/python /router/bin/python-2.7.4 )
    for PYTHON in ${PYTHONS[*]}; do
        $PYTHON -c "import sys; ver = sys.version_info[0] * 10 + sys.version_info[1];sys.exit(ver < 27)" > /dev/null 2>&1
        if [ $? -eq 0 ]; then
            return
        fi
    done;

    echo "*** Python version is too old, 2.7 at least is required"
    exit -1
}

# function finds python3
function find_python3 {

    if [ -n "$PYTHON3" ]; then 
        PYTHON=$PYTHON3
        return;
    fi

    # try different Python3 paths
    PYTHONS=( python3 /usr/bin/python3 /auto/proj-pcube-b/apps/PL-b/tools/python3.4/bin/python3 )
    for PYTHON in ${PYTHONS[*]}; do
        $PYTHON -c "import sys; ver = sys.version_info[0] * 10 + sys.version_info[1];sys.exit(ver != 34 and ver != 35)" > /dev/null 2>&1
        if [ $? -eq 0 ]; then
            return
        fi
    done;

    echo "*** Python3 version does not match, 3.4 or 3.5 is required"
    exit -1
}

case "$1" in
    "--python2") # we want python2
        find_python2
        ;;
    "--python3") # we want python3
        find_python3
        ;;
    *)
        if [ -z "$PYTHON" ]; then # no python env. var
            case $USER in
                imarom|hhaim|ybrustin|ibarnea) # dev users, 70% python3 30% python2
                    case $(($RANDOM % 10)) in
                        [7-9])
                            find_python2
                            ;;
                        *)
                            find_python3
                            ;;
                    esac
                    ;;
                *) # default is find any
                    (find_python2) &> /dev/null && find_python2 && return
                    (find_python3) &> /dev/null && find_python3 && return
                    echo "Python versions 2.7 or 3.4 or 3.5 required"
                    exit -1
                    ;;
            esac
        fi
        ;;
esac