#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2009-2011, Nicolas Clairon
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the University of California, Berkeley nor the
#       names of its contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

try:
    from pymongo import MongoClient as PymongoConnection
    from pymongo import MongoReplicaSetClient as PymongoReplicaSetConnection
except ImportError:
    from pymongo import Connection as PymongoConnection
from .database import Database


class CallableMixin(object):
    """
    brings the callable method to a Document. usefull for the connection's
    register method
    """
    def __call__(self, doc=None, gen_skel=True, lang='en', fallback_lang='en'):
        return self._obj_class(
            doc=doc,
            gen_skel=gen_skel,
            collection=self.collection,
            lang=lang,
            fallback_lang=fallback_lang
        )

_iterables = (list, tuple, set, frozenset)


class MongoKitConnection(object):

    def __init__(self, *args, **kwargs):
        self._databases = {}
        self._registered_documents = {}

    def register(self, obj_list):
        decorator = None
        if not isinstance(obj_list, _iterables):
            # we assume that the user used this as a decorator
            # using @register syntax or using conn.register(SomeDoc)
            # we stock the class object in order to return it later
            decorator = obj_list
            obj_list = [obj_list]
        # cleanup
        for db in self._databases.values():
            for col in db._collections.values():
                col._documents.clear()
                for obj in obj_list:
                    if obj.__name__ in col._registered_documents:
                        del col._registered_documents[obj.__name__]
        # register
        for obj in obj_list:
            CallableDocument = type(
                "Callable%s" % obj.__name__,
                (obj, CallableMixin),
                {"_obj_class": obj, "__repr__": object.__repr__}
            )
            self._registered_documents[obj.__name__] = CallableDocument
        # if the class object is stored, it means the user used a decorator and
        # we must return the class object
        if decorator is not None:
            return decorator

    def __getattr__(self, key):
        if key in self._registered_documents:
            document = self._registered_documents[key]
            try:
                return getattr(self[document.__database__][document.__collection__], key)
            except AttributeError:
                raise AttributeError("%s: __collection__ attribute not found. "
                                     "You cannot specify the `__database__` attribute without "
                                     "the `__collection__` attribute" % key)
        else:
            if key not in self._databases:
                self._databases[key] = Database(self, key)
            return self._databases[key]


class Connection(MongoKitConnection, PymongoConnection):
    def __init__(self, *args, **kwargs):
        # Specifying that it should run both the inits
        MongoKitConnection.__init__(self, *args, **kwargs)
        PymongoConnection.__init__(self, *args, **kwargs)


class ReplicaSetConnection(MongoKitConnection, PymongoReplicaSetConnection):
    def __init__(self, *args, **kwargs):
        # Specifying that it should run both the inits
        MongoKitConnection.__init__(self, *args, **kwargs)
        PymongoReplicaSetConnection.__init__(self, *args, **kwargs)

MongoClient = Connection
MongoReplicaSetClient = ReplicaSetConnection
