"""
imdb package.

This package can be used to retrieve information about a movie or
a person from the IMDb database.
It can fetch data through different media (e.g.: the IMDb web pages,
a SQL database, etc.)

Copyright 2004-2012 Davide Alberani <da@erlug.linux.it>

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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
"""

__all__ = ['IMDb', 'IMDbError', 'Movie', 'Person', 'Character', 'Company',
            'available_access_systems']
__version__ = VERSION = '4.9'

# Import compatibility module (importing it is enough).
import _compat

import sys, os, ConfigParser, logging
from types import MethodType

from imdb import Movie, Person, Character, Company
import imdb._logging
from imdb._exceptions import IMDbError, IMDbDataAccessError, IMDbParserError
from imdb.utils import build_title, build_name, build_company_name

_aux_logger = logging.getLogger('imdbpy.aux')


# URLs of the main pages for movies, persons, characters and queries.
imdbURL_base = 'http://akas.imdb.com/'

# NOTE: the urls below will be removed in a future version.
#       please use the values in the 'urls' attribute
#       of the IMDbBase subclass instance.
# http://akas.imdb.com/title/
imdbURL_movie_base = '%stitle/' % imdbURL_base
# http://akas.imdb.com/title/tt%s/
imdbURL_movie_main = imdbURL_movie_base + 'tt%s/'
# http://akas.imdb.com/name/
imdbURL_person_base = '%sname/' % imdbURL_base
# http://akas.imdb.com/name/nm%s/
imdbURL_person_main = imdbURL_person_base + 'nm%s/'
# http://akas.imdb.com/character/
imdbURL_character_base = '%scharacter/' % imdbURL_base
# http://akas.imdb.com/character/ch%s/
imdbURL_character_main = imdbURL_character_base + 'ch%s/'
# http://akas.imdb.com/company/
imdbURL_company_base = '%scompany/' % imdbURL_base
# http://akas.imdb.com/company/co%s/
imdbURL_company_main = imdbURL_company_base + 'co%s/'
# http://akas.imdb.com/keyword/%s/
imdbURL_keyword_main = imdbURL_base + 'keyword/%s/'
# http://akas.imdb.com/chart/top
imdbURL_top250 = imdbURL_base + 'chart/top'
# http://akas.imdb.com/chart/bottom
imdbURL_bottom100 = imdbURL_base + 'chart/bottom'
# http://akas.imdb.com/find?%s
imdbURL_find = imdbURL_base + 'find?%s'

# Name of the configuration file.
confFileName = 'imdbpy.cfg'

class ConfigParserWithCase(ConfigParser.ConfigParser):
    """A case-sensitive parser for configuration files."""
    def __init__(self, defaults=None, confFile=None, *args, **kwds):
        """Initialize the parser.

        *defaults* -- defaults values.
        *confFile* -- the file (or list of files) to parse."""
        ConfigParser.ConfigParser.__init__(self, defaults=defaults)
        if confFile is None:
            dotFileName = '.' + confFileName
            # Current and home directory.
            confFile = [os.path.join(os.getcwd(), confFileName),
                        os.path.join(os.getcwd(), dotFileName),
                        os.path.join(os.path.expanduser('~'), confFileName),
                        os.path.join(os.path.expanduser('~'), dotFileName)]
            if os.name == 'posix':
                sep = getattr(os.path, 'sep', '/')
                # /etc/ and /etc/conf.d/
                confFile.append(os.path.join(sep, 'etc', confFileName))
                confFile.append(os.path.join(sep, 'etc', 'conf.d',
                                            confFileName))
            else:
                # etc subdirectory of sys.prefix, for non-unix systems.
                confFile.append(os.path.join(sys.prefix, 'etc', confFileName))
        for fname in confFile:
            try:
                self.read(fname)
            except (ConfigParser.MissingSectionHeaderError,
                    ConfigParser.ParsingError), e:
                _aux_logger.warn('Troubles reading config file: %s' % e)
            # Stop at the first valid file.
            if self.has_section('imdbpy'):
                break

    def optionxform(self, optionstr):
        """Option names are case sensitive."""
        return optionstr

    def _manageValue(self, value):
        """Custom substitutions for values."""
        if not isinstance(value, (str, unicode)):
            return value
        vlower = value.lower()
        if vlower in self._boolean_states:
            return self._boolean_states[vlower]
        elif vlower == 'none':
            return None
        return value

    def get(self, section, option, *args, **kwds):
        """Return the value of an option from a given section."""
        value = ConfigParser.ConfigParser.get(self, section, option,
                                            *args, **kwds)
        return self._manageValue(value)

    def items(self, section, *args, **kwds):
        """Return a list of (key, value) tuples of items of the
        given section."""
        if section != 'DEFAULT' and not self.has_section(section):
            return []
        keys = ConfigParser.ConfigParser.options(self, section)
        return [(k, self.get(section, k, *args, **kwds)) for k in keys]

    def getDict(self, section):
        """Return a dictionary of items of the specified section."""
        return dict(self.items(section))


def IMDb(accessSystem=None, *arguments, **keywords):
    """Return an instance of the appropriate class.
    The accessSystem parameter is used to specify the kind of
    the preferred access system."""
    if accessSystem is None or accessSystem in ('auto', 'config'):
        try:
            cfg_file = ConfigParserWithCase(*arguments, **keywords)
            # Parameters set by the code take precedence.
            kwds = cfg_file.getDict('imdbpy')
            if 'accessSystem' in kwds:
                accessSystem = kwds['accessSystem']
                del kwds['accessSystem']
            else:
                accessSystem = 'http'
            kwds.update(keywords)
            keywords = kwds
        except Exception, e:
            logging.getLogger('imdbpy').warn('Unable to read configuration' \
                                            ' file; complete error: %s' % e)
            # It just LOOKS LIKE a bad habit: we tried to read config
            # options from some files, but something is gone horribly
            # wrong: ignore everything and pretend we were called with
            # the 'http' accessSystem.
            accessSystem = 'http'
    if 'loggingLevel' in keywords:
        imdb._logging.setLevel(keywords['loggingLevel'])
        del keywords['loggingLevel']
    if 'loggingConfig' in keywords:
        logCfg = keywords['loggingConfig']
        del keywords['loggingConfig']
        try:
            import logging.config
            logging.config.fileConfig(os.path.expanduser(logCfg))
        except Exception, e:
            logging.getLogger('imdbpy').warn('unable to read logger ' \
                                            'config: %s' % e)
    if accessSystem in ('httpThin', 'webThin', 'htmlThin'):
        logging.warn('httpThin was removed since IMDbPY 4.8')
        accessSystem = 'http'
    if accessSystem in ('http', 'web', 'html'):
        from parser.http import IMDbHTTPAccessSystem
        return IMDbHTTPAccessSystem(*arguments, **keywords)
    elif accessSystem in ('mobile',):
        from parser.mobile import IMDbMobileAccessSystem
        return IMDbMobileAccessSystem(*arguments, **keywords)
    elif accessSystem in ('local', 'files'):
        # The local access system was removed since IMDbPY 4.2.
        raise IMDbError('the local access system was removed since IMDbPY 4.2')
    elif accessSystem in ('sql', 'db', 'database'):
        try:
            from parser.sql import IMDbSqlAccessSystem
        except ImportError:
            raise IMDbError('the sql access system is not installed')
        return IMDbSqlAccessSystem(*arguments, **keywords)
    else:
        raise IMDbError('unknown kind of data access system: "%s"' \
                            % accessSystem)


def available_access_systems():
    """Return the list of available data access systems."""
    asList = []
    # XXX: trying to import modules is a good thing?
    try:
        from parser.http import IMDbHTTPAccessSystem
        asList.append('http')
    except ImportError:
        pass
    try:
        from parser.mobile import IMDbMobileAccessSystem
        asList.append('mobile')
    except ImportError:
        pass
    try:
        from parser.sql import IMDbSqlAccessSystem
        asList.append('sql')
    except ImportError:
        pass
    return asList


# XXX: I'm not sure this is a good guess.
#      I suppose that an argument of the IMDb function can be used to
#      set a default encoding for the output, and then Movie, Person and
#      Character objects can use this default encoding, returning strings.
#      Anyway, passing unicode strings to search_movie(), search_person()
#      and search_character() methods is always safer.
encoding = getattr(sys.stdin, 'encoding', '') or sys.getdefaultencoding()

class IMDbBase:
    """The base class used to search for a movie/person/character and
    to get a Movie/Person/Character object.

    This class cannot directly fetch data of any kind and so you
    have to search the "real" code into a subclass."""

    # The name of the preferred access system (MUST be overridden
    # in the subclasses).
    accessSystem = 'UNKNOWN'

    # Top-level logger for IMDbPY.
    _imdb_logger = logging.getLogger('imdbpy')

    # Whether to re-raise caught exceptions or not.
    _reraise_exceptions = False

    def __init__(self, defaultModFunct=None, results=20, keywordsResults=100,
                *arguments, **keywords):
        """Initialize the access system.
        If specified, defaultModFunct is the function used by
        default by the Person, Movie and Character objects, when
        accessing their text fields.
        """
        # The function used to output the strings that need modification (the
        # ones containing references to movie titles and person names).
        self._defModFunct = defaultModFunct
        # Number of results to get.
        try:
            results = int(results)
        except (TypeError, ValueError):
            results = 20
        if results < 1:
            results = 20
        self._results = results
        try:
            keywordsResults = int(keywordsResults)
        except (TypeError, ValueError):
            keywordsResults = 100
        if keywordsResults < 1:
            keywordsResults = 100
        self._keywordsResults = keywordsResults
        self._reraise_exceptions = keywords.get('reraiseExceptions') or False
        self.set_imdb_urls(keywords.get('imdbURL_base') or imdbURL_base)

    def set_imdb_urls(self, imdbURL_base):
        """Set the urls used accessing the IMDb site."""
        imdbURL_base = imdbURL_base.strip().strip('"\'')
        if not imdbURL_base.startswith('http://'):
            imdbURL_base = 'http://%s' % imdbURL_base
        if not imdbURL_base.endswith('/'):
            imdbURL_base = '%s/' % imdbURL_base
        # http://akas.imdb.com/title/
        imdbURL_movie_base='%stitle/' % imdbURL_base
        # http://akas.imdb.com/title/tt%s/
        imdbURL_movie_main=imdbURL_movie_base + 'tt%s/'
        # http://akas.imdb.com/name/
        imdbURL_person_base='%sname/' % imdbURL_base
        # http://akas.imdb.com/name/nm%s/
        imdbURL_person_main=imdbURL_person_base + 'nm%s/'
        # http://akas.imdb.com/character/
        imdbURL_character_base='%scharacter/' % imdbURL_base
        # http://akas.imdb.com/character/ch%s/
        imdbURL_character_main=imdbURL_character_base + 'ch%s/'
        # http://akas.imdb.com/company/
        imdbURL_company_base='%scompany/' % imdbURL_base
        # http://akas.imdb.com/company/co%s/
        imdbURL_company_main=imdbURL_company_base + 'co%s/'
        # http://akas.imdb.com/keyword/%s/
        imdbURL_keyword_main=imdbURL_base + 'keyword/%s/'
        # http://akas.imdb.com/chart/top
        imdbURL_top250=imdbURL_base + 'chart/top',
        # http://akas.imdb.com/chart/bottom
        imdbURL_bottom100=imdbURL_base + 'chart/bottom'
        # http://akas.imdb.com/find?%s
        imdbURL_find=imdbURL_base + 'find?%s'
        self.urls = dict(
            movie_base=imdbURL_movie_base,
            movie_main=imdbURL_movie_main,
            person_base=imdbURL_person_base,
            person_main=imdbURL_person_main,
            character_base=imdbURL_character_base,
            character_main=imdbURL_character_main,
            company_base=imdbURL_company_base,
            company_main=imdbURL_company_main,
            keyword_main=imdbURL_keyword_main,
            top250=imdbURL_top250,
            bottom100=imdbURL_bottom100,
            find=imdbURL_find)

    def _normalize_movieID(self, movieID):
        """Normalize the given movieID."""
        # By default, do nothing.
        return movieID

    def _normalize_personID(self, personID):
        """Normalize the given personID."""
        # By default, do nothing.
        return personID

    def _normalize_characterID(self, characterID):
        """Normalize the given characterID."""
        # By default, do nothing.
        return characterID

    def _normalize_companyID(self, companyID):
        """Normalize the given companyID."""
        # By default, do nothing.
        return companyID

    def _get_real_movieID(self, movieID):
        """Handle title aliases."""
        # By default, do nothing.
        return movieID

    def _get_real_personID(self, personID):
        """Handle name aliases."""
        # By default, do nothing.
        return personID

    def _get_real_characterID(self, characterID):
        """Handle character name aliases."""
        # By default, do nothing.
        return characterID

    def _get_real_companyID(self, companyID):
        """Handle company name aliases."""
        # By default, do nothing.
        return companyID

    def _get_infoset(self, prefname):
        """Return methods with the name starting with prefname."""
        infoset = []
        excludes = ('%sinfoset' % prefname,)
        preflen = len(prefname)
        for name in dir(self.__class__):
            if name.startswith(prefname) and name not in excludes:
                member = getattr(self.__class__, name)
                if isinstance(member, MethodType):
                    infoset.append(name[preflen:].replace('_', ' '))
        return infoset

    def get_movie_infoset(self):
        """Return the list of info set available for movies."""
        return self._get_infoset('get_movie_')

    def get_person_infoset(self):
        """Return the list of info set available for persons."""
        return self._get_infoset('get_person_')

    def get_character_infoset(self):
        """Return the list of info set available for characters."""
        return self._get_infoset('get_character_')

    def get_company_infoset(self):
        """Return the list of info set available for companies."""
        return self._get_infoset('get_company_')

    def get_movie(self, movieID, info=Movie.Movie.default_info, modFunct=None):
        """Return a Movie object for the given movieID.

        The movieID is something used to univocally identify a movie;
        it can be the imdbID used by the IMDb web server, a file
        pointer, a line number in a file, an ID in a database, etc.

        info is the list of sets of information to retrieve.

        If specified, modFunct will be the function used by the Movie
        object when accessing its text fields (like 'plot')."""
        movieID = self._normalize_movieID(movieID)
        movieID = self._get_real_movieID(movieID)
        movie = Movie.Movie(movieID=movieID, accessSystem=self.accessSystem)
        modFunct = modFunct or self._defModFunct
        if modFunct is not None:
            movie.set_mod_funct(modFunct)
        self.update(movie, info)
        return movie

    get_episode = get_movie

    def _search_movie(self, title, results):
        """Return a list of tuples (movieID, {movieData})"""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def search_movie(self, title, results=None, _episodes=False):
        """Return a list of Movie objects for a query for the given title.
        The results argument is the maximum number of results to return."""
        if results is None:
            results = self._results
        try:
            results = int(results)
        except (ValueError, OverflowError):
            results = 20
        # XXX: I suppose it will be much safer if the user provides
        #      an unicode string... this is just a guess.
        if not isinstance(title, unicode):
            title = unicode(title, encoding, 'replace')
        if not _episodes:
            res = self._search_movie(title, results)
        else:
            res = self._search_episode(title, results)
        return [Movie.Movie(movieID=self._get_real_movieID(mi),
                data=md, modFunct=self._defModFunct,
                accessSystem=self.accessSystem) for mi, md in res][:results]

    def _search_episode(self, title, results):
        """Return a list of tuples (movieID, {movieData})"""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def search_episode(self, title, results=None):
        """Return a list of Movie objects for a query for the given title.
        The results argument is the maximum number of results to return;
        this method searches only for titles of tv (mini) series' episodes."""
        return self.search_movie(title, results=results, _episodes=True)

    def get_person(self, personID, info=Person.Person.default_info,
                    modFunct=None):
        """Return a Person object for the given personID.

        The personID is something used to univocally identify a person;
        it can be the imdbID used by the IMDb web server, a file
        pointer, a line number in a file, an ID in a database, etc.

        info is the list of sets of information to retrieve.

        If specified, modFunct will be the function used by the Person
        object when accessing its text fields (like 'mini biography')."""
        personID = self._normalize_personID(personID)
        personID = self._get_real_personID(personID)
        person = Person.Person(personID=personID,
                                accessSystem=self.accessSystem)
        modFunct = modFunct or self._defModFunct
        if modFunct is not None:
            person.set_mod_funct(modFunct)
        self.update(person, info)
        return person

    def _search_person(self, name, results):
        """Return a list of tuples (personID, {personData})"""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def search_person(self, name, results=None):
        """Return a list of Person objects for a query for the given name.

        The results argument is the maximum number of results to return."""
        if results is None:
            results = self._results
        try:
            results = int(results)
        except (ValueError, OverflowError):
            results = 20
        if not isinstance(name, unicode):
            name = unicode(name, encoding, 'replace')
        res = self._search_person(name, results)
        return [Person.Person(personID=self._get_real_personID(pi),
                data=pd, modFunct=self._defModFunct,
                accessSystem=self.accessSystem) for pi, pd in res][:results]

    def get_character(self, characterID, info=Character.Character.default_info,
                    modFunct=None):
        """Return a Character object for the given characterID.

        The characterID is something used to univocally identify a character;
        it can be the imdbID used by the IMDb web server, a file
        pointer, a line number in a file, an ID in a database, etc.

        info is the list of sets of information to retrieve.

        If specified, modFunct will be the function used by the Character
        object when accessing its text fields (like 'biography')."""
        characterID = self._normalize_characterID(characterID)
        characterID = self._get_real_characterID(characterID)
        character = Character.Character(characterID=characterID,
                                accessSystem=self.accessSystem)
        modFunct = modFunct or self._defModFunct
        if modFunct is not None:
            character.set_mod_funct(modFunct)
        self.update(character, info)
        return character

    def _search_character(self, name, results):
        """Return a list of tuples (characterID, {characterData})"""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def search_character(self, name, results=None):
        """Return a list of Character objects for a query for the given name.

        The results argument is the maximum number of results to return."""
        if results is None:
            results = self._results
        try:
            results = int(results)
        except (ValueError, OverflowError):
            results = 20
        if not isinstance(name, unicode):
            name = unicode(name, encoding, 'replace')
        res = self._search_character(name, results)
        return [Character.Character(characterID=self._get_real_characterID(pi),
                data=pd, modFunct=self._defModFunct,
                accessSystem=self.accessSystem) for pi, pd in res][:results]

    def get_company(self, companyID, info=Company.Company.default_info,
                    modFunct=None):
        """Return a Company object for the given companyID.

        The companyID is something used to univocally identify a company;
        it can be the imdbID used by the IMDb web server, a file
        pointer, a line number in a file, an ID in a database, etc.

        info is the list of sets of information to retrieve.

        If specified, modFunct will be the function used by the Company
        object when accessing its text fields (none, so far)."""
        companyID = self._normalize_companyID(companyID)
        companyID = self._get_real_companyID(companyID)
        company = Company.Company(companyID=companyID,
                                accessSystem=self.accessSystem)
        modFunct = modFunct or self._defModFunct
        if modFunct is not None:
            company.set_mod_funct(modFunct)
        self.update(company, info)
        return company

    def _search_company(self, name, results):
        """Return a list of tuples (companyID, {companyData})"""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def search_company(self, name, results=None):
        """Return a list of Company objects for a query for the given name.

        The results argument is the maximum number of results to return."""
        if results is None:
            results = self._results
        try:
            results = int(results)
        except (ValueError, OverflowError):
            results = 20
        if not isinstance(name, unicode):
            name = unicode(name, encoding, 'replace')
        res = self._search_company(name, results)
        return [Company.Company(companyID=self._get_real_companyID(pi),
                data=pd, modFunct=self._defModFunct,
                accessSystem=self.accessSystem) for pi, pd in res][:results]

    def _search_keyword(self, keyword, results):
        """Return a list of 'keyword' strings."""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def search_keyword(self, keyword, results=None):
        """Search for existing keywords, similar to the given one."""
        if results is None:
            results = self._keywordsResults
        try:
            results = int(results)
        except (ValueError, OverflowError):
            results = 100
        if not isinstance(keyword, unicode):
            keyword = unicode(keyword, encoding, 'replace')
        return self._search_keyword(keyword, results)

    def _get_keyword(self, keyword, results):
        """Return a list of tuples (movieID, {movieData})"""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def get_keyword(self, keyword, results=None):
        """Return a list of movies for the given keyword."""
        if results is None:
            results = self._keywordsResults
        try:
            results = int(results)
        except (ValueError, OverflowError):
            results = 100
        # XXX: I suppose it will be much safer if the user provides
        #      an unicode string... this is just a guess.
        if not isinstance(keyword, unicode):
            keyword = unicode(keyword, encoding, 'replace')
        res = self._get_keyword(keyword, results)
        return [Movie.Movie(movieID=self._get_real_movieID(mi),
                data=md, modFunct=self._defModFunct,
                accessSystem=self.accessSystem) for mi, md in res][:results]

    def _get_top_bottom_movies(self, kind):
        """Return the list of the top 250 or bottom 100 movies."""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        #      This method must return a list of (movieID, {movieDict})
        #      tuples.  The kind parameter can be 'top' or 'bottom'.
        raise NotImplementedError('override this method')

    def get_top250_movies(self):
        """Return the list of the top 250 movies."""
        res = self._get_top_bottom_movies('top')
        return [Movie.Movie(movieID=self._get_real_movieID(mi),
                data=md, modFunct=self._defModFunct,
                accessSystem=self.accessSystem) for mi, md in res]

    def get_bottom100_movies(self):
        """Return the list of the bottom 100 movies."""
        res = self._get_top_bottom_movies('bottom')
        return [Movie.Movie(movieID=self._get_real_movieID(mi),
                data=md, modFunct=self._defModFunct,
                accessSystem=self.accessSystem) for mi, md in res]

    def new_movie(self, *arguments, **keywords):
        """Return a Movie object."""
        # XXX: not really useful...
        if 'title' in keywords:
            if not isinstance(keywords['title'], unicode):
                keywords['title'] = unicode(keywords['title'],
                                            encoding, 'replace')
        elif len(arguments) > 1:
            if not isinstance(arguments[1], unicode):
                arguments[1] = unicode(arguments[1], encoding, 'replace')
        return Movie.Movie(accessSystem=self.accessSystem,
                            *arguments, **keywords)

    def new_person(self, *arguments, **keywords):
        """Return a Person object."""
        # XXX: not really useful...
        if 'name' in keywords:
            if not isinstance(keywords['name'], unicode):
                keywords['name'] = unicode(keywords['name'],
                                            encoding, 'replace')
        elif len(arguments) > 1:
            if not isinstance(arguments[1], unicode):
                arguments[1] = unicode(arguments[1], encoding, 'replace')
        return Person.Person(accessSystem=self.accessSystem,
                                *arguments, **keywords)

    def new_character(self, *arguments, **keywords):
        """Return a Character object."""
        # XXX: not really useful...
        if 'name' in keywords:
            if not isinstance(keywords['name'], unicode):
                keywords['name'] = unicode(keywords['name'],
                                            encoding, 'replace')
        elif len(arguments) > 1:
            if not isinstance(arguments[1], unicode):
                arguments[1] = unicode(arguments[1], encoding, 'replace')
        return Character.Character(accessSystem=self.accessSystem,
                                    *arguments, **keywords)

    def new_company(self, *arguments, **keywords):
        """Return a Company object."""
        # XXX: not really useful...
        if 'name' in keywords:
            if not isinstance(keywords['name'], unicode):
                keywords['name'] = unicode(keywords['name'],
                                            encoding, 'replace')
        elif len(arguments) > 1:
            if not isinstance(arguments[1], unicode):
                arguments[1] = unicode(arguments[1], encoding, 'replace')
        return Company.Company(accessSystem=self.accessSystem,
                                    *arguments, **keywords)

    def update(self, mop, info=None, override=0):
        """Given a Movie, Person, Character or Company object with only
        partial information, retrieve the required set of information.

        info is the list of sets of information to retrieve.

        If override is set, the information are retrieved and updated
        even if they're already in the object."""
        # XXX: should this be a method of the Movie/Person/Character/Company
        #      classes?  NO!  What for instances created by external functions?
        mopID = None
        prefix = ''
        if isinstance(mop, Movie.Movie):
            mopID = mop.movieID
            prefix = 'movie'
        elif isinstance(mop, Person.Person):
            mopID = mop.personID
            prefix = 'person'
        elif isinstance(mop, Character.Character):
            mopID = mop.characterID
            prefix = 'character'
        elif isinstance(mop, Company.Company):
            mopID = mop.companyID
            prefix = 'company'
        else:
            raise IMDbError('object ' + repr(mop) + \
                    ' is not a Movie, Person, Character or Company instance')
        if mopID is None:
            # XXX: enough?  It's obvious that there are Characters
            #      objects without characterID, so I think they should
            #      just do nothing, when an i.update(character) is tried.
            if prefix == 'character':
                return
            raise IMDbDataAccessError( \
                'the supplied object has null movieID, personID or companyID')
        if mop.accessSystem == self.accessSystem:
            aSystem = self
        else:
            aSystem = IMDb(mop.accessSystem)
        if info is None:
            info = mop.default_info
        elif info == 'all':
            if isinstance(mop, Movie.Movie):
                info = self.get_movie_infoset()
            elif isinstance(mop, Person.Person):
                info = self.get_person_infoset()
            elif isinstance(mop, Character.Character):
                info = self.get_character_infoset()
            else:
                info = self.get_company_infoset()
        if not isinstance(info, (tuple, list)):
            info = (info,)
        res = {}
        for i in info:
            if i in mop.current_info and not override:
                continue
            if not i:
                continue
            self._imdb_logger.debug('retrieving "%s" info set', i)
            try:
                method = getattr(aSystem, 'get_%s_%s' %
                                    (prefix, i.replace(' ', '_')))
            except AttributeError:
                self._imdb_logger.error('unknown information set "%s"', i)
                # Keeps going.
                method = lambda *x: {}
            try:
                ret = method(mopID)
            except Exception, e:
                self._imdb_logger.critical('caught an exception retrieving ' \
                                    'or parsing "%s" info set for mopID ' \
                                    '"%s" (accessSystem: %s)',
                                    i, mopID, mop.accessSystem, exc_info=True)
                ret = {}
                # If requested by the user, reraise the exception.
                if self._reraise_exceptions:
                    raise
            keys = None
            if 'data' in ret:
                res.update(ret['data'])
                if isinstance(ret['data'], dict):
                    keys = ret['data'].keys()
            if 'info sets' in ret:
                for ri in ret['info sets']:
                    mop.add_to_current_info(ri, keys, mainInfoset=i)
            else:
                mop.add_to_current_info(i, keys)
            if 'titlesRefs' in ret:
                mop.update_titlesRefs(ret['titlesRefs'])
            if 'namesRefs' in ret:
                mop.update_namesRefs(ret['namesRefs'])
            if 'charactersRefs' in ret:
                mop.update_charactersRefs(ret['charactersRefs'])
        mop.set_data(res, override=0)

    def get_imdbMovieID(self, movieID):
        """Translate a movieID in an imdbID (the ID used by the IMDb
        web server); must be overridden by the subclass."""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def get_imdbPersonID(self, personID):
        """Translate a personID in a imdbID (the ID used by the IMDb
        web server); must be overridden by the subclass."""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def get_imdbCharacterID(self, characterID):
        """Translate a characterID in a imdbID (the ID used by the IMDb
        web server); must be overridden by the subclass."""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def get_imdbCompanyID(self, companyID):
        """Translate a companyID in a imdbID (the ID used by the IMDb
        web server); must be overridden by the subclass."""
        # XXX: for the real implementation, see the method of the
        #      subclass, somewhere under the imdb.parser package.
        raise NotImplementedError('override this method')

    def _searchIMDb(self, kind, ton):
        """Search the IMDb akas server for the given title or name."""
        # The Exact Primary search system has gone AWOL, so we resort
        # to the mobile search. :-/
        if not ton:
            return None
        aSystem = IMDb('mobile')
        if kind == 'tt':
            searchFunct = aSystem.search_movie
            check = 'long imdb canonical title'
        elif kind == 'nm':
            searchFunct = aSystem.search_person
            check = 'long imdb canonical name'
        elif kind == 'char':
            searchFunct = aSystem.search_character
            check = 'long imdb canonical name'
        elif kind == 'co':
            # XXX: are [COUNTRY] codes included in the results?
            searchFunct = aSystem.search_company
            check = 'long imdb name'
        try:
            searchRes = searchFunct(ton)
        except IMDbError:
            return None
        # When only one result is returned, assume it was from an
        # exact match.
        if len(searchRes) == 1:
            return searchRes[0].getID()
        for item in searchRes:
            # Return the first perfect match.
            if item[check] == ton:
                return item.getID()
        return None

    def title2imdbID(self, title):
        """Translate a movie title (in the plain text data files format)
        to an imdbID.
        Try an Exact Primary Title search on IMDb;
        return None if it's unable to get the imdbID."""
        return self._searchIMDb('tt', title)

    def name2imdbID(self, name):
        """Translate a person name in an imdbID.
        Try an Exact Primary Name search on IMDb;
        return None if it's unable to get the imdbID."""
        return self._searchIMDb('tt', name)

    def character2imdbID(self, name):
        """Translate a character name in an imdbID.
        Try an Exact Primary Name search on IMDb;
        return None if it's unable to get the imdbID."""
        return self._searchIMDb('char', name)

    def company2imdbID(self, name):
        """Translate a company name in an imdbID.
        Try an Exact Primary Name search on IMDb;
        return None if it's unable to get the imdbID."""
        return self._searchIMDb('co', name)

    def get_imdbID(self, mop):
        """Return the imdbID for the given Movie, Person, Character or Company
        object."""
        imdbID = None
        if mop.accessSystem == self.accessSystem:
            aSystem = self
        else:
            aSystem = IMDb(mop.accessSystem)
        if isinstance(mop, Movie.Movie):
            if mop.movieID is not None:
                imdbID = aSystem.get_imdbMovieID(mop.movieID)
            else:
                imdbID = aSystem.title2imdbID(build_title(mop, canonical=0,
                                                ptdf=1))
        elif isinstance(mop, Person.Person):
            if mop.personID is not None:
                imdbID = aSystem.get_imdbPersonID(mop.personID)
            else:
                imdbID = aSystem.name2imdbID(build_name(mop, canonical=1))
        elif isinstance(mop, Character.Character):
            if mop.characterID is not None:
                imdbID = aSystem.get_imdbCharacterID(mop.characterID)
            else:
                # canonical=0 ?
                imdbID = aSystem.character2imdbID(build_name(mop, canonical=1))
        elif isinstance(mop, Company.Company):
            if mop.companyID is not None:
                imdbID = aSystem.get_imdbCompanyID(mop.companyID)
            else:
                imdbID = aSystem.company2imdbID(build_company_name(mop))
        else:
            raise IMDbError('object ' + repr(mop) + \
                        ' is not a Movie, Person or Character instance')
        return imdbID

    def get_imdbURL(self, mop):
        """Return the main IMDb URL for the given Movie, Person,
        Character or Company object, or None if unable to get it."""
        imdbID = self.get_imdbID(mop)
        if imdbID is None:
            return None
        if isinstance(mop, Movie.Movie):
            url_firstPart = imdbURL_movie_main
        elif isinstance(mop, Person.Person):
            url_firstPart = imdbURL_person_main
        elif isinstance(mop, Character.Character):
            url_firstPart = imdbURL_character_main
        elif isinstance(mop, Company.Company):
            url_firstPart = imdbURL_company_main
        else:
            raise IMDbError('object ' + repr(mop) + \
                        ' is not a Movie, Person, Character or Company instance')
        return url_firstPart % imdbID

    def get_special_methods(self):
        """Return the special methods defined by the subclass."""
        sm_dict = {}
        base_methods = []
        for name in dir(IMDbBase):
            member = getattr(IMDbBase, name)
            if isinstance(member, MethodType):
                base_methods.append(name)
        for name in dir(self.__class__):
            if name.startswith('_') or name in base_methods or \
                    name.startswith('get_movie_') or \
                    name.startswith('get_person_') or \
                    name.startswith('get_company_') or \
                    name.startswith('get_character_'):
                continue
            member = getattr(self.__class__, name)
            if isinstance(member, MethodType):
                sm_dict.update({name: member.__doc__})
        return sm_dict

