# -*- Mode: Python; coding: utf-8; indent-tabs-mode: nil; tab-width: 4 -*-
### BEGIN LICENSE
# Copyright (c) 2012, Peter Levi <peterlevi@peterlevi.com>
# This program is free software: you can redistribute it and/or modify it 
# under the terms of the GNU General Public License version 3, as published 
# by the Free Software Foundation.
# 
# This program is distributed in the hope that it will be useful, but 
# WITHOUT ANY WARRANTY; without even the implied warranties of 
# MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
### END LICENSE

"""Helpers for an Ubuntu application."""
import logging
import os

from . varietyconfig import get_data_file
from . Builder import Builder

def get_builder(builder_file_name):
    """Return a fully-instantiated Gtk.Builder instance from specified ui 
    file
    
    :param builder_file_name: The name of the builder file, without extension.
        Assumed to be in the 'ui' directory under the data path.
    """
    # Look for the ui file that describes the user interface.
    ui_filename = get_data_file('ui', '%s.ui' % (builder_file_name,))
    if not os.path.exists(ui_filename):
        ui_filename = None

    builder = Builder()
    builder.set_translation_domain('variety')
    builder.add_from_file(ui_filename)
    return builder


# Owais Lone : To get quick access to icons and stuff.
def get_media_file(media_file_name):
    media_filename = get_data_file('media', '%s' % (media_file_name,))
    if not os.path.exists(media_filename):
        media_filename = None

    return "file:///"+media_filename

class NullHandler(logging.Handler):
    def emit(self, record):
        pass

def set_up_logging(verbose):
    # add a handler to prevent basicConfig
    root = logging.getLogger()
    null_handler = NullHandler()
    root.addHandler(null_handler)

    formatter = logging.Formatter("%(levelname)s: %(asctime)s: %(funcName)s() '%(message)s'")

    logger = logging.getLogger('variety')
    logger_sh = logging.StreamHandler()
    logger_sh.setFormatter(formatter)
    logger.addHandler(logger_sh)

    try:
        logger_file = logging.FileHandler(
            os.path.join(os.path.expanduser(u"~/.config/variety/"), "variety.log"), "w")
        logger_file.setFormatter(formatter)
        logger.addHandler(logger_file)
    except Exception:
        logger.exception("Could not create file logger")
        pass

    lib_logger = logging.getLogger('variety_lib')
    lib_logger_sh = logging.StreamHandler()
    lib_logger_sh.setFormatter(formatter)
    lib_logger.addHandler(lib_logger_sh)

    # Set the logging level to show debug messages.
    if verbose:
        logger.setLevel(logging.INFO)
        logger.debug('logging enabled')
    if verbose > 1:
        logger.setLevel(logging.DEBUG)
    if verbose > 2:
        lib_logger.setLevel(logging.DEBUG)

def get_help_uri(page=None):
    # help_uri from source tree - default language
    here = os.path.dirname(__file__)
    help_uri = os.path.abspath(os.path.join(here, '..', 'help', 'C'))

    if not os.path.exists(help_uri):
        # installed so use gnome help tree - user's language
        help_uri = 'variety'

    # unspecified page is the index.page
    if page is not None:
        help_uri = '%s#%s' % (help_uri, page)

    return help_uri

def show_uri(parent, link):
    from gi.repository import Gtk # pylint: disable=E0611
    screen = parent.get_screen()
    Gtk.show_uri(screen, link, Gtk.get_current_event_time())

def alias(alternative_function_name):
    '''see http://www.drdobbs.com/web-development/184406073#l9'''
    def decorator(function):
        '''attach alternative_function_name(s) to function'''
        if not hasattr(function, 'aliases'):
            function.aliases = []
        function.aliases.append(alternative_function_name)
        return function
    return decorator
