'''
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you 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.
'''
import pytest

from gremlin_python.process.traversal import Bytecode, P
from gremlin_python.process.graph_traversal import (
    GraphTraversalSource, GraphTraversal)
from gremlin_python.process.graph_traversal import __ as AnonymousTraversal
from gremlin_python.structure.graph import Graph

__author__ = 'David M. Brown (davebshow@gmail.com)'


class SocialTraversal(GraphTraversal):

    def knows(self, person_name):
        return self.out("knows").hasLabel("person").has("name", person_name)

    def youngestFriendsAge(self):
        return self.out("knows").hasLabel("person").values("age").min()

    def createdAtLeast(self, number):
        return self.outE("created").count().is_(P.gte(number))

class __(AnonymousTraversal):

    graph_traversal = SocialTraversal

    @classmethod
    def knows(cls, *args):
        return cls.graph_traversal(None, None, Bytecode()).knows(*args)

    @classmethod
    def youngestFriendsAge(cls, *args):
        return cls.graph_traversal(None, None, Bytecode()).youngestFriendsAge(*args)

    @classmethod
    def createdAtLeast(cls, *args):
        return cls.graph_traversal(None, None, Bytecode()).createdAtLeast(*args)


class SocialTraversalSource(GraphTraversalSource):

    def __init__(self, *args, **kwargs):
        super(SocialTraversalSource, self).__init__(*args, **kwargs)
        self.graph_traversal = SocialTraversal

    def persons(self, *args):
        traversal = self.get_graph_traversal().V().hasLabel("person")

        if len(args) > 0:
            traversal = traversal.has("name", P.within(*args))

        return traversal


def test_dsl(remote_connection):
    social = Graph().traversal(SocialTraversalSource).withRemote(remote_connection)
    assert social.persons("marko").knows("josh").next()
    assert social.persons("marko").youngestFriendsAge().next() == 27
    assert social.persons().count().next() == 4
    assert social.persons("marko", "josh").count().next() == 2
    assert social.persons().filter(__.createdAtLeast(2)).count().next() == 1
