import pytest
from pydantic import ValidationError

from dify_agent.layers.knowledge import DifyKnowledgeBaseLayerConfig


def _valid_config() -> dict[str, object]:
    return {
        "dataset_ids": ["dataset-1"],
        "retrieval": {
            "mode": "multiple",
            "top_k": 4,
        },
    }


def test_knowledge_base_config_accepts_valid_multiple_mode() -> None:
    config = DifyKnowledgeBaseLayerConfig.model_validate(_valid_config())

    assert config.dataset_ids == ["dataset-1"]
    assert config.retrieval.top_k == 4
    assert config.metadata_filtering.mode == "disabled"


@pytest.mark.parametrize(
    "payload, expected_message",
    [
        ({"dataset_ids": [], "retrieval": {"mode": "multiple", "top_k": 4}}, "dataset_ids"),
        ({"tool_name": "knowledge_base_search", **_valid_config()}, "Extra inputs are not permitted"),
        ({"tool_description": "Search knowledge", **_valid_config()}, "Extra inputs are not permitted"),
        ({"dataset_ids": ["dataset-1"], "retrieval": {"mode": "multiple"}}, "top_k"),
        ({"dataset_ids": ["dataset-1"], "retrieval": {"mode": "single"}}, "retrieval.model"),
        (
            {
                "dataset_ids": ["dataset-1"],
                "retrieval": {"mode": "multiple", "top_k": 4},
                "metadata_filtering": {"mode": "automatic"},
            },
            "metadata_filtering.model_config",
        ),
        (
            {
                "dataset_ids": ["dataset-1"],
                "retrieval": {"mode": "multiple", "top_k": 4},
                "metadata_filtering": {"mode": "manual"},
            },
            "metadata_filtering.conditions",
        ),
    ],
)
def test_knowledge_base_config_rejects_invalid_inputs(payload: dict[str, object], expected_message: str) -> None:
    with pytest.raises(ValidationError, match=expected_message):
        _ = DifyKnowledgeBaseLayerConfig.model_validate(payload)


def test_knowledge_base_config_rejects_observation_limit_smaller_than_result_limit() -> None:
    with pytest.raises(ValidationError, match="max_observation_chars"):
        _ = DifyKnowledgeBaseLayerConfig.model_validate(
            {
                "dataset_ids": ["dataset-1"],
                "retrieval": {"mode": "multiple", "top_k": 4},
                "max_result_content_chars": 50,
                "max_observation_chars": 20,
            }
        )