# Copyright 2017-present Open Networking Foundation
#
# 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 __future__ import absolute_import
import unittest
from xosgenx.jinja2_extensions.fol2 import FOL2Python


class XProtoOptimizeTest(unittest.TestCase):
    def setUp(self):
        self.f2p = FOL2Python()
        self.maxDiff = None

    def test_constant(self):
        input = "True"
        output = self.f2p.hoist_outer(input)
        self.assertEqual(output, input)

    def test_exists(self):
        input = {"exists": ["X", {"|": ["X.foo", "y"]}]}

        output = self.f2p.hoist_outer(input)
        expected = {"|": ["y", {"&": [{"not": "y"}, {"exists": ["X", "X.foo"]}]}]}
        self.assertEqual(output, expected)

    def test_exists_implies(self):
        input = {
            "exists": [
                "Foo",
                {
                    "&": [
                        {"=": ("Foo.a", "1")},
                        {"->": ["write_access", {"=": ("Foo.b", "1")}]},
                    ]
                },
            ]
        }

        output = self.f2p.hoist_outer(input)
        expected = {
            "|": [
                {
                    "&": [
                        "write_access",
                        {
                            "exists": [
                                "Foo",
                                {"&": [{"=": ["Foo.a", "1"]}, {"=": ["Foo.b", "1"]}]},
                            ]
                        },
                    ]
                },
                {
                    "&": [
                        {"not": "write_access"},
                        {"exists": ["Foo", {"=": ["Foo.a", "1"]}]},
                    ]
                },
            ]
        }
        self.assertEqual(output, expected)

    def test_forall(self):
        input = {"forall": ["X", {"|": ["X.foo", "y"]}]}

        output = self.f2p.hoist_outer(input)
        expected = {"|": ["y", {"&": [{"not": "y"}, {"forall": ["X", "X.foo"]}]}]}
        self.assertEqual(output, expected)

    def test_exists_embedded(self):
        input = {"&": ["True", {"exists": ["X", {"|": ["X.foo", "y"]}]}]}

        output = self.f2p.hoist_outer(input)
        expected = {"|": ["y", {"&": [{"not": "y"}, {"exists": ["X", "X.foo"]}]}]}
        self.assertEqual(output, expected)

    def test_exists_equals(self):
        input = {"&": ["True", {"exists": ["X", {"|": ["X.foo", {"=": ["y", "z"]}]}]}]}

        output = self.f2p.hoist_outer(input)
        expected = {
            "|": [
                {"=": ["y", "z"]},
                {"&": [{"not": {"=": ["y", "z"]}}, {"exists": ["X", "X.foo"]}]},
            ]
        }
        self.assertEqual(output, expected)

    def test_exists_nested_constant(self):
        input = {"&": ["True", {"exists": ["X", {"|": ["y", {"=": ["y", "X.foo"]}]}]}]}

        output = self.f2p.hoist_outer(input)
        expected = {
            "|": [
                "y",
                {"&": [{"not": "y"}, {"exists": ["X", {"=": ["False", "X.foo"]}]}]},
            ]
        }
        self.assertEqual(output, expected)

    def test_exists_nested(self):
        input = {"exists": ["X", {"exists": ["Y", {"=": ["Y.foo", "X.foo"]}]}]}

        output = self.f2p.hoist_outer(input)
        expected = input
        self.assertEqual(input, output)

    def test_exists_nested2(self):
        input = {"exists": ["X", {"exists": ["Y", {"=": ["Z", "Y"]}]}]}

        output = self.f2p.hoist_outer(input)
        expected = {"exists": ["Y", {"=": ["Z", "Y"]}]}
        self.assertEqual(output, expected)

    def test_exists_nested3(self):
        input = {"exists": ["X", {"exists": ["Y", {"=": ["Z", "X"]}]}]}

        output = self.f2p.hoist_outer(input)
        expected = {"exists": ["X", {"=": ["Z", "X"]}]}
        self.assertEqual(output, expected)


if __name__ == "__main__":
    unittest.main()