#!/bin/sh

# This script wraps selection of a NUT-Monitor implementation usable
# on the current system, using the historic name for users to have
# a single simple call.
#
# Copyright (C):
#   2022-2025 Jim Klimov <jimklimov+nut@gmail.com>
#
# License: GPLv2+

# Currently we have issues using localization for py3qt5 variant,
# so if both seem functional, the wrapper would call py2gtk2:
case "${PREFER_PY2-}" in
    true|false) ;;
    "") PREFER_PY2=true ;;
    *)  echo "Unsupported value of PREFER_PY2='$PREFER_PY2', defaulting to 'true'" >&2
        PREFER_PY2=true
        ;;
esac

# Detect which variant of NUT-Monitor we can run on the local system:
[ -s "$0"-py2gtk2 -a -x "$0"-py2gtk2 ] && PYTHON_PY2GTK2_SHEBANG="`head -1 \"$0\"-py2gtk2 | sed 's,^#!,,'`" || PYTHON_PY2GTK2_SHEBANG=""
[ -s "$0"-py3qt5 -a  -x "$0"-py3qt5 ]  && PYTHON_PY3QT5_SHEBANG="`head -1 \"$0\"-py3qt5 | sed 's,^#!,,'`"   || PYTHON_PY3QT5_SHEBANG=""
[ -s "$0"-py3qt6 -a  -x "$0"-py3qt6 ]  && PYTHON_PY3QT6_SHEBANG="`head -1 \"$0\"-py3qt6 | sed 's,^#!,,'`"   || PYTHON_PY3QT6_SHEBANG=""
SCRIPTDIR="`dirname \"$0\"`" && SCRIPTDIR="`cd \"$SCRIPTDIR\" && pwd`" || SCRIPTDIR="./"

PYTHON_PY2GTK2=""
for P in "$PYTHON2" "$PYTHON_PY2GTK2_SHEBANG" "python2" "python" ; do
    if [ -n "$P" ] \
    && (command -v $P) >/dev/null 2>/dev/null \
    && $P -c "import re,glob,codecs,gtk,gtk.glade,gobject,ConfigParser" >/dev/null 2>/dev/null \
    ; then
        PYTHON_PY2GTK2="$P"
        echo "PYTHON_PY2GTK2 is usable as: $PYTHON_PY2GTK2" >&2
        break
    fi
done

PYTHON_PY3QT5=""
for P in "$PYTHON3" "$PYTHON_PY3QT5_SHEBANG" "python3" "python" ; do
    if [ -n "$P" ] \
    && (command -v $P) >/dev/null 2>/dev/null \
    && $P -c "import re,glob,codecs,PyQt5.uic,configparser" >/dev/null 2>/dev/null \
    ; then
        PYTHON_PY3QT5="$P"
        echo "PYTHON_PY3QT5 is usable as: $PYTHON_PY3QT5" >&2
        break
    fi
done

PYTHON_PY3QT6=""
for P in "$PYTHON3" "$PYTHON_PY3QT6_SHEBANG" "python3" "python" ; do
    if [ -n "$P" ] \
    && (command -v $P) >/dev/null 2>/dev/null \
    && $P -c "import re,glob,codecs,PyQt6.uic,configparser" >/dev/null 2>/dev/null \
    ; then
        PYTHON_PY3QT6="$P"
        echo "PYTHON_PY3QT6 is usable as: $PYTHON_PY3QT6" >&2
        break
    fi
done

for P in "$PYTHON_PY2GTK2" "$PYTHON_PY3QT5" "$PYTHON_PY3QT6" ; do
    [ -n "$P" ] || continue

    # If running from source tree...
    if $P -c "import PyNUT" >/dev/null 2>/dev/null ; then
        true
    else
        if PYTHONPATH="${SCRIPTDIR}/../module" $P -c "import PyNUT" >/dev/null 2>/dev/null ; then
            PYTHONPATH="${SCRIPTDIR}/../module"
            export PYTHONPATH
        fi
    fi
done

if [ -n "$PYTHON_PY2GTK2" ] && [ -n "$PYTHON_PY3QT5" ] && [ -n "$PYTHON_PY3QT6" ] ; then
    if $PREFER_PY2 ; then
        echo "Starting $0-py2gtk2 variant..." >&2
        exec $PYTHON_PY2GTK2 "$0"-py2gtk2 "$@"
    else
        echo "Starting $0-py3qt6 variant..." >&2
        exec $PYTHON_PY3QT6 "$0"-py3qt6 "$@"
    fi
else
    if [ -n "$PYTHON_PY2GTK2" ] ; then
        echo "Starting $0-py2gtk2 variant..." >&2
        exec $PYTHON_PY2GTK2 "$0"-py2gtk2 "$@"
    fi
    if [ -n "$PYTHON_PY3QT6" ] ; then
        echo "Starting $0-py3qt6 variant..." >&2
        exec $PYTHON_PY3QT6 "$0"-py3qt6 "$@"
    fi
    if [ -n "$PYTHON_PY3QT5" ] ; then
        echo "Starting $0-py3qt5 variant..." >&2
        exec $PYTHON_PY3QT5 "$0"-py3qt5 "$@"
    fi
fi

echo "ERROR: No usable Python interpreter version (with needed modules) was found" >&2
exit 1
