#!/usr/bin/env bash

next_python () {
        if [ "$POL_PYTHON" = "$1" ]; then
                # will pick the next one
                POL_PYTHON=""
        elif [ -z "$POL_PYTHON" ]; then
                POL_PYTHON="$1"
        fi
}

search_python () {
        POL_PYTHON=""
        while true; do
                # list of interpreter names to try, in order
                next_python "python"
                next_python "python2.7"
                next_python "python2.6"
                next_python "python2"
                next_python "none"

                if [ "$POL_PYTHON" = "none" ]; then
                        echo "Please install python before trying to run this program" 1>&2
                        return 1
                fi

                echo -n "Looking for $POL_PYTHON... " 1>&2
                if [ "$(which $POL_PYTHON)" ]; then
                        local Version=$($POL_PYTHON --version 2>&1 |tail -n 1|sed -e 's/^Python //')
                        echo -n "$Version - " 1>&2
                        case "$Version" in
                            2.6|2.6.*|2.7|2.7.*)
                                if test_python; then
                                        echo "selected" 1>&2
                                        return 0
                                fi
                                echo "failed tests" 1>&2
                                ;;
                            2.5|2.5.*)
                                # Compatibility broken a while ago
                                echo "skipped" 1>&2
                                ;;
                            3.*)
                                # Not supported because of wxPython
                                echo "skipped" 1>&2
                                ;;
                            *)
                                echo "unexpected version" 1>&2
                                ;;
                        esac
                else
                        # Interpreter name not found
                        echo "" 1>&2
                fi
        done
}

test_python () {
    "$POL_PYTHON" "$POLDIR/python/check_python.py"
}