import pytest
from unittest.mock import patch, MagicMock
from app.services.ocr_service import extract_text, _detect_language

def test_detect_language():
    assert _detect_language("C'est une phrase en français.") == "fr"
    assert _detect_language("This is a sentence in English.") == "en"
    assert _detect_language("") == "unknown"
    assert _detect_language("123456789") == "unknown"

@patch("app.services.ocr_service.pytesseract")
@patch("app.services.ocr_service.PILImage")
@patch("app.services.ocr_service.Path.exists", return_value=True)
@patch("app.services.ocr_service.settings")
def test_extract_text_success(mock_settings, mock_path_exists, mock_pil, mock_tesseract):
    mock_settings.OCR_ENABLED = True
    mock_settings.OCR_LANGUAGES = "fra+eng"
    mock_settings.TESSERACT_CMD = None
    
    # Mock image_to_data
    mock_tesseract.image_to_data.return_value = {
        "conf": ["90", "80", "-1", "70"]
    }
    mock_tesseract.Output.DICT = "dict"
    
    # Mock image_to_string
    mock_tesseract.image_to_string.return_value = "This is a test OCR output."
    
    result = extract_text("fake/path.jpg")
    
    assert result["has_text"] is True
    assert result["text"] == "This is a test OCR output."
    assert result["confidence"] == 0.8  # (90+80+70)/3 / 100 = 0.8
    assert result["language"] == "en"

@patch("app.services.ocr_service.settings")
def test_extract_text_disabled(mock_settings):
    mock_settings.OCR_ENABLED = False
    result = extract_text("any/path.jpg")
    assert result["has_text"] is False
    assert result["text"] is None