import asyncio
import aiohttp
import pytest
from unittest.mock import MagicMock, patch
from litellm.proxy.guardrails.guardrail_hooks.presidio import _OPTIONAL_PresidioPIIMasking

@pytest.mark.asyncio
async def test_sanity_presidio_session_reuse_main_thread():
    """
    SANITY CHECK:
    Verify that Presidio guardrail reuses sessions in the main thread.
    This ensures we don't break existing session pooling functionality.
    """
    presidio = _OPTIONAL_PresidioPIIMasking(
        mock_testing=True,
        presidio_analyzer_api_base="http://mock-analyzer",
        presidio_anonymizer_api_base="http://mock-anonymizer"
    )
    
    session_creations = 0
    original_init = aiohttp.ClientSession.__init__
    
    def mocked_init(self, *args, **kwargs):
        nonlocal session_creations
        session_creations += 1
        original_init(self, *args, **kwargs)

    with patch.object(aiohttp.ClientSession, "__init__", side_effect=mocked_init, autospec=True):
        for _ in range(10):
            async with presidio._get_session_iterator() as session:
                pass
        
        # Expected: Only 1 session created for all 10 calls.
        assert session_creations == 1
        
    await presidio._close_http_session()

@pytest.mark.asyncio
async def test_bug_presidio_session_explosion_background_thread_causes_latency():
    """
    BUG REPRODUCTION:
    Verify that background threads (like logging hooks) REUSE sessions.
    Previously, each call in a background loop created a NEW ephemeral session, 
    leading to socket exhaustion and the reported 97s latency spike.
    """
    import threading
    presidio = _OPTIONAL_PresidioPIIMasking(
        mock_testing=True,
        presidio_analyzer_api_base="http://mock-analyzer",
        presidio_anonymizer_api_base="http://mock-anonymizer"
    )
    
    # Force the code to think it's in a background thread
    presidio._main_thread_id = threading.get_ident() + 1
    
    session_creations = 0
    original_init = aiohttp.ClientSession.__init__
    
    def mocked_init(self, *args, **kwargs):
        nonlocal session_creations
        session_creations += 1
        original_init(self, *args, **kwargs)

    with patch.object(aiohttp.ClientSession, "__init__", side_effect=mocked_init, autospec=True):
        for _ in range(10):
            async with presidio._get_session_iterator() as session:
                pass
        
        # FIX VERIFICATION: Should now be 1 session (reused) instead of 10.
        assert session_creations == 1
        
    await presidio._close_http_session()