import pytest
import numpy as np
from unittest.mock import MagicMock
from app.engine import PromptSearchEngine


@pytest.fixture
def mock_prompts():
    return ["prompt 1", "prompt 2", "prompt 3"]


@pytest.fixture
def mock_model():
    model = MagicMock()
    model.encode = MagicMock(return_value=np.array([
        [0.1, 0.2, 0.3],
        [0.4, 0.5, 0.6],
        [0.7, 0.8, 0.9]
    ]))
    return model


@pytest.mark.unit
def test_engine_initialization(mock_prompts, mock_model, monkeypatch):
    # SentenceTransformer is mocked to return the mock model
    monkeypatch.setattr("app.engine.SentenceTransformer", MagicMock(return_value=mock_model))
    engine = PromptSearchEngine(mock_prompts)
    # Verify that the engine initializes correctly with the mock prompts and vectors
    assert engine.prompts == mock_prompts
    assert engine.corpus_vectors.shape == (3, 3)
    assert np.array_equal(
        engine.corpus_vectors,
        np.array([[0.1, 0.2, 0.3], [0.4, 0.5, 0.6], [0.7, 0.8, 0.9]])
    )


@pytest.mark.unit
def test_most_similar_valid_query(mock_prompts, mock_model, monkeypatch):
    monkeypatch.setattr("app.engine.SentenceTransformer", MagicMock(return_value=mock_model))
    engine = PromptSearchEngine(mock_prompts)
    # Mock the vectorizer's transform method to return a single query vector
    engine.vectorizer.transform = MagicMock(return_value=np.array([[0.1, 0.2, 0.3]]))
    results = engine.most_similar("test query", n=2)
    assert len(results) == 2
    assert all(isinstance(score, float) and isinstance(prompt, str) for score, prompt in results)


@pytest.mark.unit
def test_most_similar_exceeding_n(mock_prompts, mock_model, monkeypatch):
    monkeypatch.setattr("app.engine.SentenceTransformer", MagicMock(return_value=mock_model))
    engine = PromptSearchEngine(mock_prompts)
    engine.vectorizer.transform = MagicMock(return_value=np.array([[0.1, 0.2, 0.3]]))
    # Call most_similar with n greater than the number of prompts
    results = engine.most_similar("test query", n=10)
    assert len(results) == len(mock_prompts)  # Should return at most the number of prompts
    assert all(isinstance(score, float) and isinstance(prompt, str) for score, prompt in results)


@pytest.mark.integration
def test_most_similar_integration(mock_prompts):
    engine = PromptSearchEngine(mock_prompts)
    results = engine.most_similar("prompt 1", n=2)
    # Verify that the results include the expected number of matches and correct types
    assert len(results) == 2
    assert all(isinstance(score, float) and isinstance(prompt, str) for score, prompt in results)
    assert results[0][1] == "prompt 1"