# -*- coding: utf8 -*-
from plone.app.querystring.interfaces import IParsedQueryIndexModifier
from zope.interface import implements


class Subject(object):

    """
    The Subject field in Plone currently uses a utf-8 encoded string.
    When a catalog query tries to compare a unicode string from the
    parsedquery with existing utf-8 encoded string indexes unindexing
    will fail with a UnicodeDecodeError. To prevent this from happening
    we always encode the Subject query.

    XXX: As soon as Plone uses unicode for all indexes, this code can
    be removed.
    """

    implements(IParsedQueryIndexModifier)

    def __call__(self, value):
        query = value['query']
        # query can be a unicode string or a list of unicode strings.
        if isinstance(query, unicode):
            query = query.encode("utf-8")
        elif isinstance(query, list):
            # We do not want to change the collections' own query string,
            # therefore we create a new copy of the list.
            copy_of_query = list(query)
            # Iterate over all query items and encode them if they are
            # unicode strings
            i = 0
            for item in copy_of_query:
                if isinstance(item, unicode):
                    copy_of_query[i] = item.encode("utf-8")
                i += 1
            query = copy_of_query
        else:
            pass
        value['query'] = query
        return ('Subject', value)


class base(object):

    """
    DateIndex query modifier
    see Products.PluginIndexes.DateIndex.DateIndex.DateIndex._convert function
    """

    implements(IParsedQueryIndexModifier)

    def __call__(self, value):
        query = value['query']
        if isinstance(query, unicode):
            query = query.encode("utf-8")
        elif isinstance(query, list):
            query = [
                item.encode("utf-8") if isinstance(item, unicode) else item
                for item in query
            ]
        else:
            pass
        value['query'] = query
        return (self.__class__.__name__, value)


class Date(base):
    pass


class created(base):
    pass


class effective(base):
    pass


class end(base):
    pass


class expires(base):
    pass


class modified(base):
    pass


class start(base):
    pass