# mssql/adodbapi.py
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php

"""
.. dialect:: mssql+adodbapi
    :name: adodbapi
    :dbapi: adodbapi
    :connectstring: mssql+adodbapi://<username>:<password>@<dsnname>
    :url: http://adodbapi.sourceforge.net/

.. note::

    The adodbapi dialect is not implemented SQLAlchemy versions 0.6 and
    above at this time.

"""
import datetime
from sqlalchemy import types as sqltypes, util
from sqlalchemy.dialects.mssql.base import MSDateTime, MSDialect
import sys


class MSDateTime_adodbapi(MSDateTime):
    def result_processor(self, dialect, coltype):
        def process(value):
            # adodbapi will return datetimes with empty time
            # values as datetime.date() objects.
            # Promote them back to full datetime.datetime()
            if type(value) is datetime.date:
                return datetime.datetime(value.year, value.month, value.day)
            return value
        return process


class MSDialect_adodbapi(MSDialect):
    supports_sane_rowcount = True
    supports_sane_multi_rowcount = True
    supports_unicode = sys.maxunicode == 65535
    supports_unicode_statements = True
    driver = 'adodbapi'

    @classmethod
    def import_dbapi(cls):
        import adodbapi as module
        return module

    colspecs = util.update_copy(
        MSDialect.colspecs,
        {
            sqltypes.DateTime: MSDateTime_adodbapi
        }
    )

    def create_connect_args(self, url):
        def check_quote(token):
            if ";" in str(token):
                token = "'%s'" % token
            return token

        keys = dict(
            (k, check_quote(v)) for k, v in url.query.items()
        )

        connectors = ["Provider=SQLOLEDB"]
        if 'port' in keys:
            connectors.append("Data Source=%s, %s" %
                              (keys.get("host"), keys.get("port")))
        else:
            connectors.append("Data Source=%s" % keys.get("host"))
        connectors.append("Initial Catalog=%s" % keys.get("database"))
        user = keys.get("user")
        if user:
            connectors.append("User Id=%s" % user)
            connectors.append("Password=%s" % keys.get("password", ""))
        else:
            connectors.append("Integrated Security=SSPI")
        return [[";".join(connectors)], {}]

    def is_disconnect(self, e, connection, cursor):
        return isinstance(e, self.dbapi.adodbapi.DatabaseError) and \
            "'connection failure'" in str(e)

dialect = MSDialect_adodbapi
