"""数据库层测试."""
import gc
import tempfile
from pathlib import Path

import pytest

from src.core.db import VectorDB


class TestVectorDB:
    """VectorDB 测试."""

    @pytest.fixture
    def temp_dir(self):
        with tempfile.TemporaryDirectory(ignore_cleanup_errors=True) as d:
            yield d

    def test_init_creates_persist_directory(self, temp_dir):
        """初始化时自动创建持久化目录."""
        db = VectorDB(persist_dir=temp_dir + "/subdir")
        assert Path(temp_dir + "/subdir").exists()
        assert db.client is not None

    def test_get_or_create_collection(self, temp_dir):
        """创建或获取 collection."""
        db = VectorDB(persist_dir=temp_dir)
        col = db.get_or_create_collection("test_col")
        assert col.name == "test_col"

        # 再次获取应返回同一个
        col2 = db.get_or_create_collection("test_col")
        assert col2.name == "test_col"

    def test_count_returns_zero_for_empty_collection(self, temp_dir):
        """空 collection 文档数为 0."""
        db = VectorDB(persist_dir=temp_dir)
        col = db.get_or_create_collection("test_col")
        assert col.count() == 0

    def test_delete_collection(self, temp_dir):
        """删除 collection."""
        db = VectorDB(persist_dir=temp_dir)
        db.get_or_create_collection("tmp_col")
        db.delete_collection("tmp_col")
        # 再次获取会创建新的
        col = db.get_or_create_collection("tmp_col")
        assert col.count() == 0