import pytest
from h02_gsd_calculator import GSDCalculator
from f02_1_flight_lifecycle_manager import CameraParameters

@pytest.fixture
def simple_camera():
    return CameraParameters(
        focal_length_mm=10.0,
        sensor_width_mm=10.0,
        resolution={"width": 1000, "height": 1000}
    )

@pytest.fixture
def realistic_camera():
    return CameraParameters(
        focal_length_mm=25.0,
        sensor_width_mm=23.5,
        resolution={"width": 6252, "height": 4168}
    )

@pytest.fixture
def gsd_calc():
    return GSDCalculator()

class TestGSDCalculator:

    def test_calculate_gsd_simple(self, gsd_calc, simple_camera):
        gsd = gsd_calc.compute_gsd(100.0, simple_camera)
        assert gsd == pytest.approx(0.1)

    def test_calculate_gsd_realistic(self, gsd_calc, realistic_camera):
        gsd = gsd_calc.compute_gsd(400.0, realistic_camera)
        assert gsd == pytest.approx(0.060, abs=0.001)

    def test_meters_per_pixel(self, gsd_calc):
        m_px = gsd_calc.meters_per_pixel(48.0, 19)
        assert m_px > 0.0

    def test_altitude_to_scale(self, gsd_calc):
        scale = gsd_calc.altitude_to_scale(100.0, 25.0)
        assert scale == 4.0