from unittest.mock import MagicMock
from unittest.mock import patch

import pytest
from llama_index.core.llms import ChatMessage

from paperless.ai.client import AIClient


@pytest.fixture
def mock_ai_config():
    with patch("paperless.ai.client.AIConfig") as MockAIConfig:
        mock_config = MagicMock()
        MockAIConfig.return_value = mock_config
        yield mock_config


@pytest.fixture
def mock_ollama_llm():
    with patch("paperless.ai.client.OllamaLLM") as MockOllamaLLM:
        yield MockOllamaLLM


@pytest.fixture
def mock_openai_llm():
    with patch("paperless.ai.client.OpenAI") as MockOpenAI:
        yield MockOpenAI


def test_get_llm_ollama(mock_ai_config, mock_ollama_llm):
    mock_ai_config.llm_backend = "ollama"
    mock_ai_config.llm_model = "test_model"
    mock_ai_config.llm_url = "http://test-url"

    client = AIClient()

    mock_ollama_llm.assert_called_once_with(
        model="test_model",
        base_url="http://test-url",
    )
    assert client.llm == mock_ollama_llm.return_value


def test_get_llm_openai(mock_ai_config, mock_openai_llm):
    mock_ai_config.llm_backend = "openai"
    mock_ai_config.llm_model = "test_model"
    mock_ai_config.openai_api_key = "test_api_key"

    client = AIClient()

    mock_openai_llm.assert_called_once_with(
        model="test_model",
        api_key="test_api_key",
    )
    assert client.llm == mock_openai_llm.return_value


def test_get_llm_unsupported_backend(mock_ai_config):
    mock_ai_config.llm_backend = "unsupported"

    with pytest.raises(ValueError, match="Unsupported LLM backend: unsupported"):
        AIClient()


def test_run_llm_query(mock_ai_config, mock_ollama_llm):
    mock_ai_config.llm_backend = "ollama"
    mock_ai_config.llm_model = "test_model"
    mock_ai_config.llm_url = "http://test-url"

    mock_llm_instance = mock_ollama_llm.return_value
    mock_llm_instance.complete.return_value = "test_result"

    client = AIClient()
    result = client.run_llm_query("test_prompt")

    mock_llm_instance.complete.assert_called_once_with("test_prompt")
    assert result == "test_result"


def test_run_chat(mock_ai_config, mock_ollama_llm):
    mock_ai_config.llm_backend = "ollama"
    mock_ai_config.llm_model = "test_model"
    mock_ai_config.llm_url = "http://test-url"

    mock_llm_instance = mock_ollama_llm.return_value
    mock_llm_instance.chat.return_value = "test_chat_result"

    client = AIClient()
    messages = [ChatMessage(role="user", content="Hello")]
    result = client.run_chat(messages)

    mock_llm_instance.chat.assert_called_once_with(messages)
    assert result == "test_chat_result"