# Miro - an RSS based video player application
# Copyright (C) 2005-2010 Participatory Culture Foundation
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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 St, Fifth Floor, Boston, MA  02110-1301 USA
#
# In addition, as a special exception, the copyright holders give
# permission to link the code of portions of this program with the OpenSSL
# library.
#
# You must obey the GNU General Public License in all respects for all of
# the code used other than OpenSSL. If you modify file(s) with this
# exception, you may extend this exception to your version of the file(s),
# but you are not obligated to do so. If you do not wish to do so, delete
# this exception statement from your version. If you delete this exception
# statement from all source files in the program, then also delete it here.

"""``miro.appconfig`` -- Contains the AppConfig class, which handles
holding the values of ``app.config``.

If Miro is using a theme, then the theme's app.config value overrides
the default one.

Most uses of AppConfig will come from the global variable
``app.configfile``.  This is setup in ``config.load()``.
"""

import logging
import traceback

from miro import util
from miro.plat import resources

class AppConfig(object):
    def __init__(self, theme=None):
        self.theme_vars = {}

        app_config_path = resources.path('app.config')
        self.default_vars = util.read_simple_config_file(app_config_path)

        self.load_theme(theme)

    def load_theme(self, theme):
        if theme is not None:
            logging.info("Using theme %s" % theme)
            theme_app_config = resources.theme_path(theme, 'app.config')
            try:
                self.theme_vars = util.read_simple_config_file(theme_app_config)
            except EnvironmentError:
                logging.warn("Error loading theme: %s\n%s", 
                        theme_app_config, traceback.format_exc())

    def get(self, key, use_theme_data=True):
        if use_theme_data and key in self.theme_vars:
            return self.theme_vars[key]
        else:
            return self.default_vars[key]

    def __getitem__(self, key):
        return self.get(key, use_theme_data=True)

    def contains(self, key, use_theme_data=True):
        return ((use_theme_data and key in self.theme_vars) or 
                (key in self.default_vars))
