#

# Copyright 2006,2009 Free Software Foundation, Inc.

# 

# This file is part of GNU Radio

# 

# GNU Radio 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, or (at your option)

# any later version.

# 

# GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to

# the Free Software Foundation, Inc., 51 Franklin Street,

# Boston, MA 02110-1301, USA.

# 

import gnuradio_core as gsp

_prefs_base = gsp.gr_prefs

import ConfigParser

import os

import os.path

import sys

def _user_prefs_filename():

    return os.path.expanduser('~/.gnuradio/config.conf')

def _sys_prefs_dirname():

    return gsp.prefsdir()

def _bool(x):

    """

    Try to coerce obj to a True or False

    """

    if isinstance(x, bool):

        return x

    if isinstance(x, (float, int)):

        return bool(x)

    raise TypeError, x

class _prefs(_prefs_base):

    """

    Derive our 'real class' from the stubbed out base class that has support

    for SWIG directors.  This allows C++ code to magically and transparently

    invoke the methods in this python class.

    """

    def __init__(self):

        _prefs_base.__init__(self)

        self.cp = ConfigParser.RawConfigParser()

        self.__getattr__ = lambda self, name: getattr(self.cp, name)

    def _sys_prefs_filenames(self):

        dir = _sys_prefs_dirname()

        try:

            fnames = os.listdir(dir)

        except (IOError, OSError):

            return []

        fnames.sort()

        return [os.path.join(dir, f) for f in fnames]

    def _read_files(self):

        filenames = self._sys_prefs_filenames()

        filenames.append(_user_prefs_filename())

        #print "filenames: ", filenames

        self.cp.read(filenames)

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

    # These methods override the C++ virtual methods of the same name

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

    def has_section(self, section):

        return self.cp.has_section(section)

    def has_option(self, section, option):

        return self.cp.has_option(section, option)

    def get_string(self, section, option, default_val):

        try:

            return self.cp.get(section, option)

        except:

            return default_val

    def get_bool(self, section, option, default_val):

        try:

            return self.cp.getboolean(section, option)

        except:

            return default_val

    def get_long(self, section, option, default_val):

        try:

            return self.cp.getint(section, option)

        except:

            return default_val

    def get_double(self, section, option, default_val):

        try:

            return self.cp.getfloat(section, option)

        except:

            return default_val

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

    #              End override of C++ virtual methods

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

_prefs_db = _prefs()

# if GR_DONT_LOAD_PREFS is set, don't load them.

# (make check uses this to avoid interactions.)

if os.getenv("GR_DONT_LOAD_PREFS", None) is None:

    _prefs_db._read_files()

_prefs_base.set_singleton(_prefs_db)    # tell C++ what instance to use

def prefs():

    """

    Return the global preference data base

    """

    return _prefs_db