"""
Tests for model loader singleton behaviour.
"""

import pytest
from unittest.mock import patch, MagicMock


@patch("app.services.model_loader.LLM")
def test_get_llm_gemini_singleton(mock_llm_cls):
    """get_llm_gemini() must return the same instance on repeated calls."""
    # Clear lru_cache between test runs
    from app.services.model_loader import get_llm_gemini
    get_llm_gemini.cache_clear()

    mock_llm_cls.return_value = MagicMock(name="GeminiLLM")

    first = get_llm_gemini()
    second = get_llm_gemini()

    assert first is second
    assert mock_llm_cls.call_count == 1


@patch("app.services.model_loader.LLM")
def test_get_llm_groq_singleton(mock_llm_cls):
    from app.services.model_loader import get_llm_groq
    get_llm_groq.cache_clear()

    mock_llm_cls.return_value = MagicMock(name="GroqLLM")

    first = get_llm_groq()
    second = get_llm_groq()

    assert first is second
    assert mock_llm_cls.call_count == 1


@patch("app.services.model_loader.LLM")
def test_get_llm_open_router_singleton(mock_llm_cls):
    from app.services.model_loader import get_llm_open_router
    get_llm_open_router.cache_clear()

    mock_llm_cls.return_value = MagicMock(name="OpenRouterLLM")

    first = get_llm_open_router()
    second = get_llm_open_router()

    assert first is second
    assert mock_llm_cls.call_count == 1