# -*- coding: utf-8 -*-
# enzyme - Video metadata parser
# Copyright 2011-2012 Antoine Bertin <diaoulael@gmail.com>
# Copyright 2003-2006 Thomas Schueppel <stain@acm.org>
# Copyright 2003-2006 Dirk Meyer <dischi@freevo.org>
#
# This file is part of enzyme.
#
# enzyme 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.
#
# enzyme 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 enzyme.  If not, see <http://www.gnu.org/licenses/>.
import importlib
import mimetypes
import os
# import sys
from .exceptions import *


PARSERS = [('asf', ['video/asf'], ['asf', 'wmv', 'wma']),
           ('flv', ['video/flv'], ['flv']),
           ('mkv', ['video/x-matroska', 'application/mkv'], ['mkv', 'mka', 'webm']),
           ('mp4', ['video/quicktime', 'video/mp4'], ['mov', 'qt', 'mp4', 'mp4a', 'm4v', '3gp', '3gp2', '3g2', 'mk2']),
           ('mpeg', ['video/mpeg'], ['mpeg', 'mpg', 'mp4', 'ts']),
           ('ogm', ['application/ogg'], ['ogm', 'ogg', 'ogv']),
           ('real', ['video/real'], ['rm', 'ra', 'ram']),
           ('riff', ['video/avi'], ['wav', 'avi'])
           ]


def parse(path):
    """Parse metadata of the given video

    :param string path: path to the video file to parse
    :return: a parser corresponding to the video's mimetype or extension
    :rtype: :class:`~enzyme.core.AVContainer`

    """
    if not os.path.isfile(path):
        raise ValueError('Invalid path')
    extension = os.path.splitext(path)[1][1:]
    mimetype = mimetypes.guess_type(path)[0]
    parser_ext = None
    parser_mime = None
    for (parser_name, parser_mimetypes, parser_extensions) in PARSERS:
        if mimetype in parser_mimetypes:
            parser_mime = parser_name
        if extension in parser_extensions:
            parser_ext = parser_name
    parser = parser_mime or parser_ext
    if not parser:
        raise NoParserError()
    try:
        # mod = __import__('.', globals=globals(), locals=locals(), fromlist=[], level=0)
        mod = importlib.import_module('enzyme.' + parser)
    except (BaseException, Exception):
        return
    with open(path, 'rb') as f:
        p = mod.Parser(f)
    return p
