"""F-05: the service must refuse to start on a corpus/model manifest
mismatch, not silently search with vectors the collection wasn't built from.
"""
import pytest

from rag.manifest import ManifestMismatch, check_manifest, manifest_collection


def test_manifest_collection_naming():
    assert manifest_collection("duocthu_v1") == "duocthu_v1__manifest"


def test_matching_manifest_passes():
    check_manifest(
        {"model_id": "cohere.embed-v4:0", "dimensions": 1024},
        "duocthu_v1", "cohere.embed-v4:0", 1024,
    )  # no raise


def test_missing_manifest_refuses():
    with pytest.raises(ManifestMismatch, match="no corpus manifest"):
        check_manifest(None, "duocthu_v1", "cohere.embed-v4:0", 1024)


def test_wrong_model_id_refuses_even_with_matching_dimensions():
    """The exact scenario the finding names: two unrelated models can both
    produce 1024-dim vectors."""
    with pytest.raises(ManifestMismatch, match="model_id"):
        check_manifest(
            {"model_id": "amazon.titan-embed-text-v2:0", "dimensions": 1024},
            "duocthu_v1", "cohere.embed-v4:0", 1024,
        )


def test_wrong_dimensions_refuses():
    with pytest.raises(ManifestMismatch, match="dimensions"):
        check_manifest(
            {"model_id": "cohere.embed-v4:0", "dimensions": 768},
            "duocthu_v1", "cohere.embed-v4:0", 1024,
        )


def test_both_mismatched_reports_both():
    with pytest.raises(ManifestMismatch) as excinfo:
        check_manifest(
            {"model_id": "other-model", "dimensions": 768},
            "duocthu_v1", "cohere.embed-v4:0", 1024,
        )
    assert "model_id" in str(excinfo.value)
    assert "dimensions" in str(excinfo.value)