#!/usr/bin/python
# -*- coding: utf-8 -*-

# Hive Appier Framework
# Copyright (C) 2008-2012 Hive Solutions Lda.
#
# This file is part of Hive Appier Framework.
#
# Hive Appier Framework 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.
#
# Hive Appier Framework 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 Hive Appier Framework. If not, see <http://www.gnu.org/licenses/>.

__author__ = "João Magalhães joamag@hive.pt>"
""" The author(s) of the module """

__version__ = "1.0.0"
""" The version of the module """

__revision__ = "$LastChangedRevision$"
""" The revision number of the module """

__date__ = "$LastChangedDate$"
""" The last change date of the module """

__copyright__ = "Copyright (c) 2008-2012 Hive Solutions Lda."
""" The copyright for the module """

__license__ = "GNU General Public License (GPL), Version 3"
""" The license for the module """

import json
import model
import typesf

import base
import config

try: import pymongo
except: pymongo = None

try: import bson.json_util
except: bson = None

connection = None
""" The global connection object that should persist
the connection relation with the database service """

class Mongo(object):

    def __init__(self):
        self._connection = None
        self._db = None

    def get_connection(self):
        if self._connection: return self._connection
        url = config.conf("MONGOHQ_URL", "mongodb://localhost:27017")
        self._connection = pymongo.Connection(url)
        return self._connection

    def get_db(self, name):
        if self._db: return self._db
        connection = self.get_connection()
        self._db = connection[name]
        return self._db

def get_connection():
    global connection
    if connection: return connection
    url = config.conf("MONGOHQ_URL", "mongodb://localhost:27017")
    connection = pymongo.Connection(url)
    return connection

def get_db(name = None):
    name = name or base.get_name() or "master"
    connection = get_connection()
    db = connection[name]
    return db

def drop_db(name = None):
    db = get_db(name = name)
    names = db.collection_names()
    for name in names:
        if name.startswith("system."): continue
        db.drop_collection(name)

def dumps(*args):
    return json.dumps(default = serialize, *args)

def serialize(obj):
    if isinstance(obj, model.Model): return obj.model
    if isinstance(obj, typesf.Type): return obj.json_v()
    return bson.json_util.default(obj)

def is_mongo(obj):
    if bson and isinstance(obj, bson.ObjectId): return True
    if bson and isinstance(obj, bson.DBRef): return True
    return False
