from pathlib import Path

import src.ai.memory as memory_module


class _FakeJSONStore:
    def __init__(self, storage_path: Path):
        self.storage_path = storage_path


def test_memory_retries_once_on_chroma_conflict(monkeypatch, tmp_path: Path):
    class _FlakyChroma:
        calls = 0

        def __init__(self, persist_directory: Path):
            type(self).calls += 1
            self.persist_directory = persist_directory
            if type(self).calls == 1:
                raise RuntimeError("table embeddings already exists")

    monkeypatch.setattr(memory_module, "ChromaVectorStore", _FlakyChroma)
    monkeypatch.setattr(memory_module, "JSONVectorStore", _FakeJSONStore)

    memory = memory_module.MemorySystem(
        storage_path=tmp_path / "long_term_memory.json",
        use_vector_db=True,
    )

    assert isinstance(memory.vector_store, _FlakyChroma)
    assert _FlakyChroma.calls == 2


def test_memory_rebuilds_chroma_directory_when_conflict_persists(monkeypatch, tmp_path: Path):
    class _RecoverOnThirdTryChroma:
        calls = 0

        def __init__(self, persist_directory: Path):
            type(self).calls += 1
            self.persist_directory = persist_directory
            if type(self).calls <= 2:
                raise RuntimeError("table embeddings already exists")

    monkeypatch.setattr(memory_module, "ChromaVectorStore", _RecoverOnThirdTryChroma)
    monkeypatch.setattr(memory_module, "JSONVectorStore", _FakeJSONStore)

    storage_root = tmp_path / "ai"
    chroma_dir = storage_root / "chroma_db"
    chroma_dir.mkdir(parents=True, exist_ok=True)
    (chroma_dir / "marker.txt").write_text("legacy-data", encoding="utf-8")

    memory = memory_module.MemorySystem(
        storage_path=storage_root / "long_term_memory.json",
        use_vector_db=True,
    )

    assert isinstance(memory.vector_store, _RecoverOnThirdTryChroma)
    assert _RecoverOnThirdTryChroma.calls == 3

    backups = sorted(storage_root.glob("chroma_db_backup_conflict_*"))
    assert backups, "expected backup directory after repair"
    assert (backups[-1] / "marker.txt").exists()
    assert chroma_dir.exists()


def test_memory_falls_back_to_json_if_chroma_repair_fails(monkeypatch, tmp_path: Path):
    class _AlwaysFailChroma:
        def __init__(self, persist_directory: Path):
            raise RuntimeError("table embeddings already exists")

    monkeypatch.setattr(memory_module, "ChromaVectorStore", _AlwaysFailChroma)
    monkeypatch.setattr(memory_module, "JSONVectorStore", _FakeJSONStore)

    memory = memory_module.MemorySystem(
        storage_path=tmp_path / "long_term_memory.json",
        use_vector_db=True,
    )

    assert isinstance(memory.vector_store, _FakeJSONStore)