# Copyright 2007-2012 The HyperSpy developers
#
# This file is part of HyperSpy.
#
# HyperSpy is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# HyperSpy is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with HyperSpy. If not, see <http://www.gnu.org/licenses/>.


import numpy as np

import nose.tools
from nose.tools import assert_true
from hyperspy._signals.spectrum import Spectrum
from hyperspy.components import Gaussian


class TestFitOneComponent:

    def setUp(self):
        g = Gaussian()
        g.A.value = 10000.0
        g.centre.value = 5000.0
        g.sigma.value = 500.0
        axis = np.arange(10000)
        s = Spectrum(g.function(axis))
        m = s.create_model()
        self.model = m
        self.g = g
        self.axis = axis
        self.rtol = 0.00

    def test_fit_component(self):
        m = self.model
        axis = self.axis

        g1 = Gaussian()
        m.append(g1)
        m.fit_component(g1, signal_range=(4000, 6000))
        assert_true(
            np.allclose(
                self.g.function(axis),
                g1.function(axis),
                rtol=self.rtol))

    @nose.tools.raises(ValueError)
    def test_component_not_in_model(self):
        self.model.fit_component(self.g)


class TestFitSeveralComponent:

    def setUp(self):
        gs1 = Gaussian()
        gs1.A.value = 10000.0
        gs1.centre.value = 5000.0
        gs1.sigma.value = 500.0

        gs2 = Gaussian()
        gs2.A.value = 60000.0
        gs2.centre.value = 2000.0
        gs2.sigma.value = 300.0

        gs3 = Gaussian()
        gs3.A.value = 20000.0
        gs3.centre.value = 6000.0
        gs3.sigma.value = 100.0

        axis = np.arange(10000)
        total_signal = (gs1.function(axis) +
                        gs2.function(axis) +
                        gs3.function(axis))

        s = Spectrum(total_signal)
        m = s.create_model()

        g1 = Gaussian()
        g2 = Gaussian()
        g3 = Gaussian()
        m.append(g1)
        m.append(g2)
        m.append(g3)

        self.model = m
        self.gs1 = gs1
        self.gs2 = gs2
        self.gs3 = gs3
        self.g1 = g1
        self.g2 = g2
        self.g3 = g3
        self.axis = axis
        self.rtol = 0.01

    def test_fit_component_active_state(self):
        m = self.model
        axis = self.axis
        g1 = self.g1
        g2 = self.g2
        g3 = self.g3
        g2.active = True
        g3.active = False
        m.fit_component(g1, signal_range=(4500, 5200), fit_independent=True)
        assert_true(
            np.allclose(
                self.gs1.function(axis),
                g1.function(axis),
                rtol=self.rtol))
        assert_true(g1.active)
        assert_true(g2.active)
        assert_true(not g3.active)

    def test_fit_component_free_state(self):
        m = self.model
        axis = self.axis
        g1 = self.g1
        g2 = self.g2
        g3 = self.g3
        g2.A.free = False
        g2.sigma.free = False
        m.fit_component(g1, signal_range=(4500, 5200))
        assert_true(
            np.allclose(
                self.gs1.function(axis),
                g1.function(axis),
                rtol=self.rtol))

        assert_true(g1.A.free)
        assert_true(g1.sigma.free)
        assert_true(g1.centre.free)

        assert_true(not g2.A.free)
        assert_true(not g2.sigma.free)
        assert_true(g2.centre.free)

        assert_true(g3.A.free)
        assert_true(g3.sigma.free)
        assert_true(g3.centre.free)

    def test_fit_multiple_component(self):
        m = self.model
        g1 = self.g1
        g2 = self.g2
        g3 = self.g3
        m.fit_component(g1, signal_range=(4500, 5200))
        m.fit_component(g2, signal_range=(1500, 2200))
        m.fit_component(g3, signal_range=(5800, 6150))
        assert_true(
            np.allclose(
                self.model.spectrum.data,
                m(),
                rtol=self.rtol))
