"""
# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
#
# 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.
"""

import unittest

from fastdeploy.reasoning import ReasoningParser, ReasoningParserManager


class TestReasoningParser(ReasoningParser):
    def is_reasoning_end(self, input_ids):
        """
        Return True to simulate end of reasoning content.
        """
        return True

    def extract_content_ids(self, input_ids):
        """
        Return input_ids directly for testing.
        """
        return input_ids

    def extract_reasoning_content(self, model_output, request):
        """
        Used for testing non-streaming extraction.
        """
        return model_output, model_output

    def extract_reasoning_content_streaming(
        self, previous_text, current_text, delta_text, previous_token_ids, current_token_ids, delta_token_ids
    ):
        """
        Return None for streaming extraction; minimal implementation for testing.
        """
        return None


class TestReasoningParserManager(unittest.TestCase):
    """
    Unit tests for ReasoningParserManager functionality.
    """

    def setUp(self):
        """
        Save original registry to restore after each test.
        """
        self.original_parsers = ReasoningParserManager.reasoning_parsers.copy()

    def tearDown(self):
        """
        Restore original registry to avoid test pollution.
        """
        ReasoningParserManager.reasoning_parsers = self.original_parsers.copy()

    def test_register_and_get_parser(self):
        """
        Test that a parser can be registered and retrieved successfully.
        Verifies normal registration and retrieval functionality.
        """
        ReasoningParserManager.register_module(module=TestReasoningParser, name="test_parser", force=True)
        parser_cls = ReasoningParserManager.get_reasoning_parser("test_parser")
        self.assertIs(parser_cls, TestReasoningParser)

    def test_register_duplicate_without_force_raises(self):
        """
        Test that registering a parser with an existing name without force raises KeyError.
        Ensures duplicate registrations are handled correctly.
        """
        ReasoningParserManager.register_module(module=TestReasoningParser, name="test_parser2", force=True)
        with self.assertRaises(KeyError):
            ReasoningParserManager.register_module(module=TestReasoningParser, name="test_parser2", force=False)

    def test_register_non_subclass_raises(self):
        """
        Test that registering a class not inheriting from ReasoningParser raises TypeError.
        Ensures type safety for registered modules.
        """

        class NotParser:
            pass

        with self.assertRaises(TypeError):
            ReasoningParserManager.register_module(module=NotParser, name="not_parser")

    def test_get_unregistered_parser_raises(self):
        """
        Test that retrieving a parser that was not registered raises KeyError.
        Ensures get_reasoning_parser handles unknown names correctly.
        """
        with self.assertRaises(KeyError):
            ReasoningParserManager.get_reasoning_parser("nonexistent_parser")


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