#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# GuessIt - A library for guessing information from filenames
# Copyright (c) 2011 Nicolas Wack <wackou@gmail.com>
#
# GuessIt is free software; you can redistribute it and/or modify it under
# the terms of the Lesser GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# GuessIt 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
# Lesser GNU General Public License for more details.
#
# You should have received a copy of the Lesser GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

__version__ = '0.5-dev'
__all__ = ['Guess', 'Language',
           'guess_file_info', 'guess_video_info',
           'guess_movie_info', 'guess_episode_info']


from guessit.guess import Guess, merge_all
from guessit.language import Language
from guessit.matcher import IterativeMatcher
import logging

log = logging.getLogger(__name__)


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

# let's be a nicely behaving library
h = NullHandler()
log.addHandler(h)


def guess_file_info(filename, filetype, info=None):
    """info can contain the names of the various plugins, such as 'filename' to
    detect filename info, or 'hash_md5' to get the md5 hash of the file.

    >>> guess_file_info('test/dummy.srt', 'autodetect', info = ['hash_md5', 'hash_sha1'])
    {'hash_md5': 'e781de9b94ba2753a8e2945b2c0a123d', 'hash_sha1': 'bfd18e2f4e5d59775c2bc14d80f56971891ed620'}
    """
    result = []
    hashers = []

    if info is None:
        info = ['filename']

    if isinstance(info, basestring):
        info = [info]

    for infotype in info:
        if infotype == 'filename':
            m = IterativeMatcher(filename, filetype=filetype)
            result.append(m.matched())

        elif infotype == 'hash_mpc':
            from guessit.hash_mpc import hash_file
            try:
                result.append(Guess({'hash_mpc': hash_file(filename)},
                                    confidence=1.0))
            except Exception, e:
                log.warning('Could not compute MPC-style hash because: %s' % e)

        elif infotype == 'hash_ed2k':
            from guessit.hash_ed2k import hash_file
            try:
                result.append(Guess({'hash_ed2k': hash_file(filename)},
                                    confidence=1.0))
            except Exception, e:
                log.warning('Could not compute ed2k hash because: %s' % e)

        elif infotype.startswith('hash_'):
            import hashlib
            hashname = infotype[5:]
            try:
                hasher = getattr(hashlib, hashname)()
                hashers.append((infotype, hasher))
            except AttributeError:
                log.warning('Could not compute %s hash because it is not available from python\'s hashlib module' % hashname)

        else:
            log.warning('Invalid infotype: %s' % infotype)

    # do all the hashes now, but on a single pass
    if hashers:
        try:
            blocksize = 8192
            hasherobjs = dict(hashers).values()

            with open(filename, 'rb') as f:
                for chunk in iter(lambda: f.read(blocksize), ''):
                    for hasher in hasherobjs:
                        hasher.update(chunk)

            for infotype, hasher in hashers:
                result.append(Guess({infotype: hasher.hexdigest()},
                                    confidence=1.0))
        except Exception, e:
            log.warning('Could not compute hash because: %s' % e)

    return merge_all(result)


def guess_video_info(filename, info=None):
    return guess_file_info(filename, 'autodetect', info)


def guess_movie_info(filename, info=None):
    return guess_file_info(filename, 'movie', info)


def guess_episode_info(filename, info=None):
    return guess_file_info(filename, 'episode', info)