# ######################################################################
# Copyright (c) 2014, Brookhaven Science Associates, Brookhaven        #
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# @author: Li Li (lili@bnl.gov)                                        #
# created on 08/19/2014                                                #
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from __future__ import absolute_import, division, print_function
import numpy as np

import skxray.core.calibration as calibration
import skxray.core.calibration as core


def _draw_gaussian_rings(shape, calibrated_center, r_list, r_width):
    R = core.radial_grid(calibrated_center, shape)
    I = np.zeros_like(R)

    for r in r_list:
        tmp = 100 * np.exp(-((R - r)/r_width)**2)
        I += tmp

    return I


def test_refine_center():
    center = np.array((500, 550))
    I = _draw_gaussian_rings((1000, 1001), center,
                             [50, 75, 100, 250, 500], 5)

    nx_opts = [None, 300]
    for nx in nx_opts:
        out = calibration.refine_center(I, center+1, (1, 1),
                                        phi_steps=20, nx=nx, min_x=10,
                                        max_x=300, window_size=5,
                                        thresh=0, max_peaks=4)

        assert np.all(np.abs(center - out) < .1)


def test_blind_d():
    gaus = lambda x, center, height, width: (
                          height * np.exp(-((x-center) / width)**2))
    name = 'Si'
    wavelength = .18
    window_size = 5
    threshold = .1
    cal = calibration.calibration_standards[name]

    tan2theta = np.tan(cal.convert_2theta(wavelength))

    D = 200
    expected_r = D * tan2theta

    bin_centers = np.linspace(0, 50, 2000)
    I = np.zeros_like(bin_centers)
    for r in expected_r:
        I += gaus(bin_centers, r, 100, .2)
    d, dstd = calibration.estimate_d_blind(name, wavelength, bin_centers,
                                     I, window_size, len(expected_r),
                                     threshold)
    assert np.abs(d - D) < 1e-6


if __name__ == '__main__':
    import nose
    nose.runmodule(argv=['-s', '--with-doctest'], exit=False)
