from unittest import TestCase
from esbo_etc.classes.optical_component.Lens import Lens
from esbo_etc.classes.SpectralQty import SpectralQty
from esbo_etc.classes.target.FileTarget import FileTarget
import astropy.units as u
import numpy as np


class TestLens(TestCase):
    wl = np.arange(201, 205, 1) << u.nm

    def setUp(self):
        self.target = FileTarget("tests/data/target/target_demo_1.csv", self.wl)
        self.lens = Lens(self.target, "tests/data/lens/lens_transmittance.csv", 0.5, temp=300 * u.K)

    def test___init__(self):
        self.assertEqual(self.lens.calcBackground(),
                         SpectralQty(self.wl, np.array([4.31413931e-96, 1.37122214e-95, 4.30844544e-95,
                                                        1.33846280e-94]) << u.W / (u.m ** 2 * u.nm * u.sr)))
        self.assertEqual(self.lens.calcSignal()[0],
                         SpectralQty(np.arange(201, 205, 1) << u.nm,
                                     np.array([1.20e-15, 1.30e-15, 1.40e-15, 1.35e-15]) << u.W /
                                     (u.m ** 2 * u.nm)))