"""Embedding dimension mismatch must fail loudly with migration guidance.

The default embedder changed from text-embedding-3-small (1536 dims) to
text-embedding-3-large (3072 dims); stores created before the upgrade must
not silently zero-fill vectors or return empty search results.
"""

from __future__ import annotations

from pathlib import Path
from unittest.mock import MagicMock

import pytest

from crewai.memory.storage.backend import EmbeddingDimensionMismatchError
from crewai.memory.types import MemoryRecord


@pytest.fixture
def lancedb_path(tmp_path: Path) -> Path:
    return tmp_path / "mem"


def _record(dim: int, content: str = "test") -> MemoryRecord:
    return MemoryRecord(content=content, scope="/foo", embedding=[0.1] * dim)


def test_lancedb_save_mismatch_raises(lancedb_path: Path) -> None:
    from crewai.memory.storage.lancedb_storage import LanceDBStorage

    storage = LanceDBStorage(path=str(lancedb_path), vector_dim=4)
    storage.save([_record(4)])

    with pytest.raises(EmbeddingDimensionMismatchError) as exc_info:
        storage.save([_record(8, "new embedder output")])

    message = str(exc_info.value)
    assert "4-dimensional" in message
    assert "8-dimensional" in message
    assert "crewai reset-memories --memory" in message
    assert "text-embedding-3-small" in message


def test_lancedb_mixed_batch_mismatch_raises(lancedb_path: Path) -> None:
    """A single save() batch with inconsistent dimensions must be rejected."""
    from crewai.memory.storage.lancedb_storage import LanceDBStorage

    storage = LanceDBStorage(path=str(lancedb_path), vector_dim=4)
    storage.save([_record(4)])

    with pytest.raises(EmbeddingDimensionMismatchError):
        storage.save([_record(4), _record(8, "stray dimension")])


def test_lancedb_mixed_batch_on_fresh_store_raises(lancedb_path: Path) -> None:
    from crewai.memory.storage.lancedb_storage import LanceDBStorage

    storage = LanceDBStorage(path=str(lancedb_path))
    with pytest.raises(EmbeddingDimensionMismatchError):
        storage.save([_record(4), _record(8)])


def test_lancedb_search_mismatch_raises(lancedb_path: Path) -> None:
    from crewai.memory.storage.lancedb_storage import LanceDBStorage

    storage = LanceDBStorage(path=str(lancedb_path), vector_dim=4)
    storage.save([_record(4)])

    with pytest.raises(EmbeddingDimensionMismatchError):
        storage.search([0.1] * 8)


def test_lancedb_update_mismatch_raises(lancedb_path: Path) -> None:
    from crewai.memory.storage.lancedb_storage import LanceDBStorage

    storage = LanceDBStorage(path=str(lancedb_path), vector_dim=4)
    record = _record(4)
    storage.save([record])

    stale = MemoryRecord(
        id=record.id, content="updated", scope="/foo", embedding=[0.1] * 8
    )
    with pytest.raises(EmbeddingDimensionMismatchError):
        storage.update(stale)


def test_lancedb_reopened_store_detects_mismatch(lancedb_path: Path) -> None:
    """The upgrade scenario: an old store reopened with a new embedder."""
    from crewai.memory.storage.lancedb_storage import LanceDBStorage

    old = LanceDBStorage(path=str(lancedb_path), vector_dim=4)
    old.save([_record(4)])

    reopened = LanceDBStorage(path=str(lancedb_path))
    with pytest.raises(EmbeddingDimensionMismatchError):
        reopened.save([_record(8)])
    with pytest.raises(EmbeddingDimensionMismatchError):
        reopened.search([0.1] * 8)


def test_memory_reset_all_rebuilds_reopened_store_with_new_dimension(
    lancedb_path: Path,
) -> None:
    from crewai.memory.storage.lancedb_storage import LanceDBStorage
    from crewai.memory.unified_memory import Memory

    old = LanceDBStorage(path=str(lancedb_path), vector_dim=4)
    old.save([_record(4)])

    mem = Memory(
        storage=str(lancedb_path),
        llm=MagicMock(),
        embedder=lambda texts: [[0.1] * 8 for _ in texts],
        root_scope="/crew/test",
    )

    mem.reset_all()
    mem.remember(
        "new embedder output",
        scope="/facts",
        categories=["test"],
        importance=0.5,
    )

    assert mem.recall("new embedder output", scope="/facts", depth="shallow")


def test_lancedb_matching_dim_still_works(lancedb_path: Path) -> None:
    from crewai.memory.storage.lancedb_storage import LanceDBStorage

    storage = LanceDBStorage(path=str(lancedb_path), vector_dim=4)
    storage.save([_record(4)])
    storage.save([_record(4, "second")])

    assert len(storage.search([0.1] * 4, limit=5)) == 2


def test_error_is_not_a_runtime_error() -> None:
    """Background-save plumbing treats RuntimeError as executor shutdown and
    silently drops the save — the mismatch must not be classified that way."""
    err = EmbeddingDimensionMismatchError(1536, 3072)
    assert not isinstance(err, RuntimeError)
    assert isinstance(err, ValueError)


def test_background_save_propagates_dimension_mismatch(tmp_path: Path) -> None:
    from unittest.mock import MagicMock

    from crewai.memory.unified_memory import Memory

    mem = Memory(
        storage=str(tmp_path / "db"),
        llm=MagicMock(),
        embedder=lambda texts: [[0.1] * 4 for _ in texts],
    )

    def raise_mismatch(*_args: object, **_kwargs: object) -> None:
        raise EmbeddingDimensionMismatchError(1536, 3072)

    mem._encode_batch = raise_mismatch  # type: ignore[method-assign]

    with pytest.raises(EmbeddingDimensionMismatchError):
        mem._background_encode_batch(["content"], None, None, None, None, None, False, None)


def test_background_save_still_swallows_shutdown_runtime_error(tmp_path: Path) -> None:
    from unittest.mock import MagicMock

    from crewai.memory.unified_memory import Memory

    mem = Memory(
        storage=str(tmp_path / "db"),
        llm=MagicMock(),
        embedder=lambda texts: [[0.1] * 4 for _ in texts],
    )

    def raise_shutdown(*_args: object, **_kwargs: object) -> None:
        raise RuntimeError("cannot schedule new futures after shutdown")

    mem._encode_batch = raise_shutdown  # type: ignore[method-assign]

    assert (
        mem._background_encode_batch(
            ["content"], None, None, None, None, None, False, None
        )
        == []
    )