import pytest
from unittest.mock import patch, MagicMock
from app.services.exif_service import extract_exif, _dms_to_decimal

def test_dms_to_decimal():
    # 48° 51' 23.82" N -> 48.8566167
    dms = ((48, 1), (51, 1), (2382, 100))
    assert _dms_to_decimal(dms, "N") == 48.8566167
    assert _dms_to_decimal(dms, "S") == -48.8566167

@patch("app.services.exif_service.piexif")
@patch("app.services.exif_service.PILImage")
@patch("app.services.exif_service.Path.exists", return_value=True)
def test_extract_exif_success(mock_path_exists, mock_pil, mock_piexif):
    # Mock piexif data
    import piexif
    mock_data = {
        "0th": {
            piexif.ImageIFD.Make: b"Canon",
            piexif.ImageIFD.Model: b"EOS R5",
            piexif.ImageIFD.Software: b"1.1.0"
        },
        "Exif": {
            piexif.ExifIFD.DateTimeOriginal: b"2024:06:15 14:30:00",
            piexif.ExifIFD.ISOSpeedRatings: 400,
            piexif.ExifIFD.FNumber: (28, 10),
            piexif.ExifIFD.ExposureTime: (1, 250),
            piexif.ExifIFD.FocalLength: (500, 10),
            piexif.ExifIFD.Flash: 0
        },
        "GPS": {
            piexif.GPSIFD.GPSLatitude: ((48, 1), (51, 1), (2382, 100)),
            piexif.GPSIFD.GPSLatitudeRef: b"N",
            piexif.GPSIFD.GPSLongitude: ((2, 1), (21, 1), (792, 100)),
            piexif.GPSIFD.GPSLongitudeRef: b"E",
            piexif.GPSIFD.GPSAltitude: (350, 10)
        }
    }
    mock_piexif.load.return_value = mock_data
    mock_piexif.ImageIFD = piexif.ImageIFD
    mock_piexif.ExifIFD = piexif.ExifIFD
    mock_piexif.GPSIFD = piexif.GPSIFD
    
    # Mock PIL
    mock_img = mock_pil.open.return_value.__enter__.return_value
    mock_img._getexif.return_value = {271: "Canon"} # 271 is Make
    
    result = extract_exif("fake/path.jpg")
    
    assert result["make"] == "Canon"
    assert result["model"] == "EOS R5"
    assert result["iso"] == 400
    assert result["aperture"] == "f/2.8"
    assert result["shutter"] == "1/250"
    assert result["focal"] == "50mm"
    assert result["gps_lat"] == 48.8566167
    assert result["altitude"] == 35.0