#!/bin/env python

# -*- coding: utf-8 -*-

# ------------------------------------------------------------

# environment.py

# 

# pick some current environment infos

#

# Autor: Oliver Maurhart, <oliver.maurhart@ait.ac.at>

#

# Copyright (C) 2013 AIT Austrian Institute of Technology

# AIT Austrian Institute of Technology GmbH

# Donau-City-Strasse 1 | 1220 Vienna | Austria

# http://www.ait.ac.at

#

# This program 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 version 2.

# 

# This program 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 this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, 

# Boston, MA  02110-1301, USA.

# ------------------------------------------------------------

# ------------------------------------------------------------

# imports

import os

import os.path

import sys

# ------------------------------------------------------------

# code

class Environment(object):

    """Hold some nifty environment stuff in a dedicated class."""

    def __init__(self, application = None):

        # if we ain't got a path to start from, all is valid/lost

        if len(sys.path[0]) == 0:

            self._prefix_path = ''

            self._data_path = ''

            return

        # the prefix path

        #

        # - on Linux: this is ../../ to the current executable

        #   e.g. "/usr/bin/myprogram" --> "/usr"

        #

        # - on Windows (inkl. Cygwin): this is the installation folder

        #   e.g. "C:/Program Files/MyProgram/myprogam" --> "C:/Program Files/MyProgram"

        #

        if sys.platform == 'linux2':

            self._prefix_path = os.path.split(sys.path[0])[0]

        elif sys.platform == 'win32' or sys.platform == 'cygwin':

            self._prefix_path = sys.path[0]

        # the data path where all data files are stored

        if sys.platform == 'linux2':

            if not application is None:

                self._data_path = os.path.join(self._prefix_path, os.path.join('share', application))

            else:

                self._data_path = os.path.join(self._prefix_path, 'share')

        elif sys.platform == 'win32' or sys.platform == 'cygwin':

            self._data_path = self._prefix_path

    def data_path_get(self):

        """dat_path get"""

        return self._data_path

    data_path = property(data_path_get)

    def prefix_path_get(self):

        """prefix_path get"""

        return self._prefix_path

    prefix_path = property(prefix_path_get)

# test method			

def test():

    """Test: class Environment"""

    e = Environment('My Application')

    print('prefix_path: "{0}"'.format(e.prefix_path))

    print('  data_path: "{0}"'.format(e.data_path))

# test the module			

if __name__ == '__main__':

    test()