import unittest

from models import AssistantConfig
from services.pipecat.pipeline import _knowledge_tool_description


class KnowledgeToolDescriptionTest(unittest.TestCase):
    def test_includes_bound_knowledge_scope(self):
        description = _knowledge_tool_description(
            AssistantConfig(
                knowledge_base_name="产品服务知识库",
                knowledge_base_description="产品价格、售后政策和退换货条件",
            )
        )

        self.assertIn("知识库名称：产品服务知识库", description)
        self.assertIn("资料适用范围：产品价格、售后政策和退换货条件", description)
        self.assertIn("与该范围无关的问题不要调用", description)

    def test_falls_back_when_metadata_is_empty(self):
        description = _knowledge_tool_description(AssistantConfig())

        self.assertEqual(
            description,
            "在当前助手绑定的知识库中检索与问题最相关的资料片段。",
        )

    def test_compacts_and_limits_description(self):
        description = _knowledge_tool_description(
            AssistantConfig(knowledge_base_description=("范围\n  内容 " * 200))
        )

        self.assertNotIn("\n  ", description)
        self.assertLess(len(description), 1000)


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