import pytest
import io
import os
from core.renderer import ExcelRenderer
from PIL import Image

# Use the file provided by the user for reproduction
TEST_FILE_PATH = "tests/kshj_gt1767081783800.xlsx"

@pytest.mark.skipif(not os.path.exists(TEST_FILE_PATH), reason="Test file not found")
def test_font_color_rendering_real_file():
    """
    Test rendering with a real file that has font color issues.
    This test will generate an output image for visual inspection.
    """
    with open(TEST_FILE_PATH, "rb") as f:
        content = f.read()
    
    renderer = ExcelRenderer(content)
    
    try:
        # Render the first sheet (or specific sheet if known, default to active)
        img_bytes = renderer.render_to_bytes()
        
        # Save for visual inspection
        output_path = "tests/test_output_font_color.png"
        with open(output_path, "wb") as f_out:
            f_out.write(img_bytes)
            
        print(f"Generated test image at: {os.path.abspath(output_path)}")
        
        assert isinstance(img_bytes, bytes)
        assert len(img_bytes) > 0
        
    except Exception as e:
        pytest.fail(f"Rendering failed: {e}")