import os.path
import numpy as np
from numpy.testing import assert_allclose
import pytest

from optifik.scheludko import thickness_from_scheludko
from optifik.scheludko import get_default_start_stop_wavelengths
from optifik.analysis import smooth_intensities
from optifik.io import load_spectrum


def test_scheludko_4peaks():
    FOLDER = os.path.join('tests', 'basic')
    FILE_NAME = '000005253.xy'
    expected = 777.07

    spectrum_path = os.path.join(FOLDER, FILE_NAME)
    lambdas, raw_intensities = load_spectrum(spectrum_path, lambda_min=450)
    smoothed_intensities = smooth_intensities(raw_intensities)
    r_index =  1.324188 + 3102.060378 / (lambdas**2)

    prominence = 0.02


    w_start, w_stop = get_default_start_stop_wavelengths(lambdas,
                                                         smoothed_intensities,
                                                         refractive_index=r_index,
                                                         min_peak_prominence=prominence,
                                                         plot=False)


    result = thickness_from_scheludko(lambdas,
                                      smoothed_intensities,
                                      refractive_index=r_index,
                                      wavelength_start=w_start,
                                      wavelength_stop=w_stop,
                                      interference_order=None,
                                      plot=False)

    assert_allclose(result.thickness, expected, rtol=1e-1)


def test_scheludko_2peaks():
    FOLDER = os.path.join('tests', 'basic')
    FILE_NAME = '000006544.xy'
    expected = 495.69

    spectrum_path = os.path.join(FOLDER, FILE_NAME)
    lambdas, raw_intensities = load_spectrum(spectrum_path, lambda_min=450)
    smoothed_intensities = smooth_intensities(raw_intensities)
    r_index =  1.324188 + 3102.060378 / (lambdas**2)

    prominence = 0.03


    w_start, w_stop = get_default_start_stop_wavelengths(lambdas,
                                                         smoothed_intensities,
                                                         refractive_index=r_index,
                                                         min_peak_prominence=prominence,
                                                         plot=False)

    result = thickness_from_scheludko(lambdas,
                                      smoothed_intensities,
                                      refractive_index=r_index,
                                      wavelength_start=w_start,
                                      wavelength_stop=w_stop,
                                      interference_order=None,
                                      plot=False)

    assert_allclose(result.thickness, expected, rtol=1e-1)


def test_order0():
    FOLDER = os.path.join('tests', 'basic')
    FILE_NAME = '000018918.xy'
    expected = 115.33

    spectrum_path = os.path.join(FOLDER, FILE_NAME)
    lambdas, raw_intensities = load_spectrum(spectrum_path, lambda_min=450)
    smoothed_intensities = smooth_intensities(raw_intensities)
    r_index =  1.324188 + 3102.060378 / (lambdas**2)

    prominence = 0.03


    w_start, w_stop = None, None
    result = thickness_from_scheludko(lambdas,
                                      smoothed_intensities,
                                      refractive_index=r_index,
                                      wavelength_start=w_start,
                                      wavelength_stop=w_stop,
                                      interference_order=0,
                                      plot=False)


    assert_allclose(result.thickness, expected, rtol=1e-1)