#!/usr/bin/python3
# -*- coding: utf-8 -*-
# key-mapper - GUI for device specific keyboard mappings
# Copyright (C) 2020 sezanzeb <proxima@hip70890b.de>
#
# This file is part of key-mapper.
#
# key-mapper is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# key-mapper is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with key-mapper.  If not, see <https://www.gnu.org/licenses/>.


"""Get stuff from /usr/share/key-mapper, depending on the prefix."""


import sys
import os
import site
import pkg_resources

from keymapper.logger import logger


def get_data_path(filename=''):
    """Depending on the installation prefix, return the data dir.

    Since it is a nightmare to get stuff installed with pip across
    distros this is somewhat complicated. Ubuntu wants to use /usr/local
    for data_files, but not everything can be placed there.
    """
    try:
        source_path = pkg_resources.require('key-mapper')[0].location
    except pkg_resources.DistributionNotFound as error:
        # try to check where stuff usually should be
        logger.debug(error)
        data_path = '/usr/share/key-mapper'
        if not os.path.exists(data_path):
            logger.error('key-mapper data was not properly installed')
            sys.exit(1)
        return os.path.join('/usr/share/key-mapper', filename)

    # depending on where this file is installed to, make sure to use the proper
    # prefix path for data
    # https://docs.python.org/3/distutils/setupscript.html?highlight=package_data#installing-additional-files # noqa pylint: disable=line-too-long

    candidates = [
        os.path.join(site.USER_BASE, 'share/key-mapper'),
        '/usr/local/share/key-mapper',
        '/usr/share/key-mapper'
    ]

    print('source_path', source_path)
    if '/site-packages' not in source_path:
        # probably installed with -e, running from the cloned git source
        data_path = os.path.join(source_path, 'data')
    else:
        # try any of the options
        for candidate in candidates:
            if os.path.exists(candidate):
                data_path = candidate
                break
        logger.error('Could not find the application data')

    return os.path.join(data_path, filename)