# Copyright 2013-2016 DataStax, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from uuid import uuid4
from cassandra.cqlengine import ValidationError

from cassandra.cqlengine.models import Model
from cassandra.cqlengine.management import sync_table, drop_table
from cassandra.cqlengine import columns
from tests.integration.cqlengine import is_prepend_reversed
from tests.integration.cqlengine.base import BaseCassEngTestCase


class TestQueryUpdateModel(Model):

    partition   = columns.UUID(primary_key=True, default=uuid4)
    cluster     = columns.Integer(primary_key=True)
    count       = columns.Integer(required=False)
    text        = columns.Text(required=False, index=True)
    text_set    = columns.Set(columns.Text, required=False)
    text_list   = columns.List(columns.Text, required=False)
    text_map    = columns.Map(columns.Text, columns.Text, required=False)

class QueryUpdateTests(BaseCassEngTestCase):

    @classmethod
    def setUpClass(cls):
        super(QueryUpdateTests, cls).setUpClass()
        sync_table(TestQueryUpdateModel)

    @classmethod
    def tearDownClass(cls):
        super(QueryUpdateTests, cls).tearDownClass()
        drop_table(TestQueryUpdateModel)

    def test_update_values(self):
        """ tests calling udpate on a queryset """
        partition = uuid4()
        for i in range(5):
            TestQueryUpdateModel.create(partition=partition, cluster=i, count=i, text=str(i))

        # sanity check
        for i, row in enumerate(TestQueryUpdateModel.objects(partition=partition)):
            self.assertEqual(row.cluster, i)
            self.assertEqual(row.count, i)
            self.assertEqual(row.text, str(i))

        # perform update
        TestQueryUpdateModel.objects(partition=partition, cluster=3).update(count=6)

        for i, row in enumerate(TestQueryUpdateModel.objects(partition=partition)):
            self.assertEqual(row.cluster, i)
            self.assertEqual(row.count, 6 if i == 3 else i)
            self.assertEqual(row.text, str(i))

    def test_update_values_validation(self):
        """ tests calling udpate on models with values passed in """
        partition = uuid4()
        for i in range(5):
            TestQueryUpdateModel.create(partition=partition, cluster=i, count=i, text=str(i))

        # sanity check
        for i, row in enumerate(TestQueryUpdateModel.objects(partition=partition)):
            self.assertEqual(row.cluster, i)
            self.assertEqual(row.count, i)
            self.assertEqual(row.text, str(i))

        # perform update
        with self.assertRaises(ValidationError):
            TestQueryUpdateModel.objects(partition=partition, cluster=3).update(count='asdf')

    def test_invalid_update_kwarg(self):
        """ tests that passing in a kwarg to the update method that isn't a column will fail """
        with self.assertRaises(ValidationError):
            TestQueryUpdateModel.objects(partition=uuid4(), cluster=3).update(bacon=5000)

    def test_primary_key_update_failure(self):
        """ tests that attempting to update the value of a primary key will fail """
        with self.assertRaises(ValidationError):
            TestQueryUpdateModel.objects(partition=uuid4(), cluster=3).update(cluster=5000)

    def test_null_update_deletes_column(self):
        """ setting a field to null in the update should issue a delete statement """
        partition = uuid4()
        for i in range(5):
            TestQueryUpdateModel.create(partition=partition, cluster=i, count=i, text=str(i))

        # sanity check
        for i, row in enumerate(TestQueryUpdateModel.objects(partition=partition)):
            self.assertEqual(row.cluster, i)
            self.assertEqual(row.count, i)
            self.assertEqual(row.text, str(i))

        # perform update
        TestQueryUpdateModel.objects(partition=partition, cluster=3).update(text=None)

        for i, row in enumerate(TestQueryUpdateModel.objects(partition=partition)):
            self.assertEqual(row.cluster, i)
            self.assertEqual(row.count, i)
            self.assertEqual(row.text, None if i == 3 else str(i))

    def test_mixed_value_and_null_update(self):
        """ tests that updating a columns value, and removing another works properly """
        partition = uuid4()
        for i in range(5):
            TestQueryUpdateModel.create(partition=partition, cluster=i, count=i, text=str(i))

        # sanity check
        for i, row in enumerate(TestQueryUpdateModel.objects(partition=partition)):
            self.assertEqual(row.cluster, i)
            self.assertEqual(row.count, i)
            self.assertEqual(row.text, str(i))

        # perform update
        TestQueryUpdateModel.objects(partition=partition, cluster=3).update(count=6, text=None)

        for i, row in enumerate(TestQueryUpdateModel.objects(partition=partition)):
            self.assertEqual(row.cluster, i)
            self.assertEqual(row.count, 6 if i == 3 else i)
            self.assertEqual(row.text, None if i == 3 else str(i))

    def test_counter_updates(self):
        pass

    def test_set_add_updates(self):
        partition = uuid4()
        cluster = 1
        TestQueryUpdateModel.objects.create(
                partition=partition, cluster=cluster, text_set=set(("foo",)))
        TestQueryUpdateModel.objects(
                partition=partition, cluster=cluster).update(text_set__add=set(('bar',)))
        obj = TestQueryUpdateModel.objects.get(partition=partition, cluster=cluster)
        self.assertEqual(obj.text_set, set(("foo", "bar")))

    def test_set_add_updates_new_record(self):
        """ If the key doesn't exist yet, an update creates the record
        """
        partition = uuid4()
        cluster = 1
        TestQueryUpdateModel.objects(
                partition=partition, cluster=cluster).update(text_set__add=set(('bar',)))
        obj = TestQueryUpdateModel.objects.get(partition=partition, cluster=cluster)
        self.assertEqual(obj.text_set, set(("bar",)))

    def test_set_remove_updates(self):
        partition = uuid4()
        cluster = 1
        TestQueryUpdateModel.objects.create(
                partition=partition, cluster=cluster, text_set=set(("foo", "baz")))
        TestQueryUpdateModel.objects(
                partition=partition, cluster=cluster).update(
                text_set__remove=set(('foo',)))
        obj = TestQueryUpdateModel.objects.get(partition=partition, cluster=cluster)
        self.assertEqual(obj.text_set, set(("baz",)))

    def test_set_remove_new_record(self):
        """ Removing something not in the set should silently do nothing
        """
        partition = uuid4()
        cluster = 1
        TestQueryUpdateModel.objects.create(
                partition=partition, cluster=cluster, text_set=set(("foo",)))
        TestQueryUpdateModel.objects(
                partition=partition, cluster=cluster).update(
                text_set__remove=set(('afsd',)))
        obj = TestQueryUpdateModel.objects.get(partition=partition, cluster=cluster)
        self.assertEqual(obj.text_set, set(("foo",)))

    def test_list_append_updates(self):
        partition = uuid4()
        cluster = 1
        TestQueryUpdateModel.objects.create(
                partition=partition, cluster=cluster, text_list=["foo"])
        TestQueryUpdateModel.objects(
                partition=partition, cluster=cluster).update(
                text_list__append=['bar'])
        obj = TestQueryUpdateModel.objects.get(partition=partition, cluster=cluster)
        self.assertEqual(obj.text_list, ["foo", "bar"])

    def test_list_prepend_updates(self):
        """ Prepend two things since order is reversed by default by CQL """
        partition = uuid4()
        cluster = 1
        original = ["foo"]
        TestQueryUpdateModel.objects.create(
                partition=partition, cluster=cluster, text_list=original)
        prepended = ['bar', 'baz']
        TestQueryUpdateModel.objects(
                partition=partition, cluster=cluster).update(
                text_list__prepend=prepended)
        obj = TestQueryUpdateModel.objects.get(partition=partition, cluster=cluster)
        expected = (prepended[::-1] if is_prepend_reversed() else prepended) + original
        self.assertEqual(obj.text_list, expected)

    def test_map_update_updates(self):
        """ Merge a dictionary into existing value """
        partition = uuid4()
        cluster = 1
        TestQueryUpdateModel.objects.create(
                partition=partition, cluster=cluster,
                text_map={"foo": '1', "bar": '2'})
        TestQueryUpdateModel.objects(
                partition=partition, cluster=cluster).update(
                text_map__update={"bar": '3', "baz": '4'})
        obj = TestQueryUpdateModel.objects.get(partition=partition, cluster=cluster)
        self.assertEqual(obj.text_map, {"foo": '1', "bar": '3', "baz": '4'})

    def test_map_update_none_deletes_key(self):
        """ The CQL behavior is if you set a key in a map to null it deletes
        that key from the map.  Test that this works with __update.
        """
        partition = uuid4()
        cluster = 1
        TestQueryUpdateModel.objects.create(
                partition=partition, cluster=cluster,
                text_map={"foo": '1', "bar": '2'})
        TestQueryUpdateModel.objects(
                partition=partition, cluster=cluster).update(
                text_map__update={"bar": None})
        obj = TestQueryUpdateModel.objects.get(partition=partition, cluster=cluster)
        self.assertEqual(obj.text_map, {"foo": '1'})