# Copyright (c) 2020, 2021, Oracle and/or its affiliates.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2.0, as
# published by the Free Software Foundation.
#
# This program is also distributed with certain software (including
# but not limited to OpenSSL) that is licensed under separate terms,
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# documentation.  The authors of MySQL hereby grant you an
# additional permission to link the program and your derivative works
# with the separately licensed software that they have included with
# MySQL.
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# Without limiting anything contained in the foregoing, this file,
# which is part of MySQL Connector/Python, is also subject to the
# Universal FOSS Exception, version 1.0, a copy of which can be found at
# http://oss.oracle.com/licenses/universal-foss-exception.
#
# 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, version 2.0, for more details.
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from django.db.backends.mysql.operations import DatabaseOperations as MySQLDatabaseOperations
from django.conf import settings
from django.utils import timezone

try:
    from _mysql_connector import datetime_to_mysql, time_to_mysql
except ImportError:
    HAVE_CEXT = False
else:
    HAVE_CEXT = True


class DatabaseOperations(MySQLDatabaseOperations):
    compiler_module = "mysql.connector.django.compiler"

    def regex_lookup(self, lookup_type):
        if self.connection.mysql_version < (8, 0, 0):
            if lookup_type == 'regex':
                return '%s REGEXP BINARY %s'
            return '%s REGEXP %s'

        match_option = 'c' if lookup_type == 'regex' else 'i'
        return "REGEXP_LIKE(%s, %s, '%s')" % match_option

    def adapt_datetimefield_value(self, value):
        return self.value_to_db_datetime(value)

    def value_to_db_datetime(self, value):
        if value is None:
            return None
        # MySQL doesn't support tz-aware times
        if timezone.is_aware(value):
            if settings.USE_TZ:
                value = value.astimezone(timezone.utc).replace(tzinfo=None)
            else:
                raise ValueError(
                    "MySQL backend does not support timezone-aware times."
                )
        if not self.connection.features.supports_microsecond_precision:
            value = value.replace(microsecond=0)
        if not self.connection.use_pure:
            return datetime_to_mysql(value)
        return self.connection.converter.to_mysql(value)

    def adapt_timefield_value(self, value):
        return self.value_to_db_time(value)

    def value_to_db_time(self, value):
        if value is None:
            return None

        # MySQL doesn't support tz-aware times
        if timezone.is_aware(value):
            raise ValueError("MySQL backend does not support timezone-aware "
                             "times.")

        if not self.connection.use_pure:
            return time_to_mysql(value)
        return self.connection.converter.to_mysql(value)
