# Copyright 2010-2024 Google LLC
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
#     http://www.apache.org/licenses/LICENSE-2.0
#
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"""Assertions to test that protos are equivalent in MathOpt's sense.

Empty sub-messages (recursively) have no effect on equivalence, except for the
Duration message, otherwise the same as proto equality. Oneof messages have
their fields recursively cleared, but the oneof itself is not, to preserve the
selection. This is similar to C++ EquivToProto, but this function cares about:
  * field presence for optional scalar fields,
  * field presence for Duration messages (e.g. Duration unset of time limit
    means +inf),
  * field presence for one_ofs,
and C++ EquivToProto does not.

See normalize.py for details.
"""

import copy
import unittest

from google.protobuf import message

from ortools.math_opt.python import normalize


def assert_protos_equiv(
    test: unittest.TestCase, actual: message.Message, expected: message.Message
) -> None:
    """Asserts the input protos are equivalent, see module doc for details."""
    normalized_actual = copy.deepcopy(actual)
    normalize.math_opt_normalize_proto(normalized_actual)
    normalized_expected = copy.deepcopy(expected)
    normalize.math_opt_normalize_proto(normalized_expected)
    test.assertEqual(str(normalized_actual), str(normalized_expected))


class MathOptProtoAssertions(unittest.TestCase):
    """Provides a custom MathOpt proto equivalence assertion for tests."""

    def assert_protos_equiv(
        self, actual: message.Message, expected: message.Message
    ) -> None:
        """Asserts the input protos are equivalent, see module doc for details."""
        return assert_protos_equiv(self, actual, expected)