""" core/mi/eeg_psd.py 单元测试 """
# pylint: disable=missing-class-docstring
import os
import pytest

import numpy as np

from core.sig_chain.sig_reader import Reader
from core.mi.eeg_psd import PSDBasedClassifier
from core.mi.eeg_psd import Psd
from tests.utils.core import get_epochs


TEST_DATA_PATH = 'tests/data/'
BDF_FILE_PATH = os.path.join(TEST_DATA_PATH, 'eeg_raw_data.bdf')
PONY_PSD_FILE_PATH = os.path.join(TEST_DATA_PATH, 'pony_psd.png')


def setup_module():
    if not os.path.exists(TEST_DATA_PATH):
        os.makedirs(TEST_DATA_PATH)


def teardown_module():
    if os.path.exists(PONY_PSD_FILE_PATH):
        os.remove(PONY_PSD_FILE_PATH)


class TestPSDBasedClassifier():

    @classmethod
    def setup_class(cls):
        ch_names = [
            'T6', 'P4', 'Pz', 'M2', 'F8', 'F4', 'Fp1', 'Cz', 'M1', 'F7', 'F3',
            'C3', 'T3', 'A1', 'Oz', 'O1', 'O2', 'Fz', 'C4', 'T4', 'Fp2', 'A2',
            'T5', 'P3'
        ]

        reader = Reader()
        cls.raw = reader.read(BDF_FILE_PATH, tuple(ch_names))
        cls.raw.annotations.duration += 0.999

    def setup_method(self):
        self.clf = PSDBasedClassifier()

    def generate_one_sample(self, channel_count, high_freq=10, low_freq=0.4):
        # 生成信号：10Hz的正弦波 + 0.4Hz的正弦波
        tt = np.linspace(0, 1, 1000, endpoint=False)
        xx = np.sin(2 * np.pi * high_freq * tt) + np.sin(
            2 * np.pi * low_freq * tt)
        return np.stack([xx for ch in range(channel_count)])

    def test_psd_feature_extract_return_correct_shape(self):
        sample = self.generate_one_sample(1)
        bp_sample = self.clf.psd_feature_extract(sample)
        assert isinstance(bp_sample, float)
        # assert (1,) == bp_sample.shape

    def test_psd_feature_extract_get_higher_value_for_matched_signal(self):
        sample_match = self.generate_one_sample(1)
        sample_not_match = self.generate_one_sample(1, high_freq=30)
        bp_match = self.clf.psd_feature_extract(sample_match)
        bp_not_match = self.clf.psd_feature_extract(sample_not_match)
        assert bp_match > bp_not_match

    def test_fit_with_single_channel_data(self):
        ch_names = ['C4']
        epochs = get_epochs(self.raw, tuple(ch_names), 'restState', tmax=0.999)

        train_success = self.clf.fit(epochs.get_data())
        assert train_success

    def test_fit_with_multi_channel_data(self):
        ch_names = ['C3', 'C4']
        epochs = get_epochs(self.raw, tuple(ch_names), 'restState', tmax=0.999)

        train_success = self.clf.fit(epochs.get_data())
        assert train_success

    def test_predict_before_fit_note_allowed(self):
        sample = self.generate_one_sample(1)
        with pytest.raises(Exception):
            self.clf.predict(sample[np.newaxis, :])

    def test_predict_with_single_channel_data(self):
        channel_count = 1
        self.clf.is_trained = True

        sample = self.generate_one_sample(channel_count)
        pred = self.clf.predict(sample[np.newaxis, :])
        assert pred in [0, 1]

    def test_predict_with_multi_channel_data(self):
        channel_count = 2
        self.clf.is_trained = True

        sample = self.generate_one_sample(channel_count)
        pred = self.clf.predict(sample[np.newaxis, :])
        assert pred in [0, 1]

    def test_main(self):
        ch_names = ['C4']
        epochs = get_epochs(self.raw, tuple(ch_names), 'restState', tmax=0.999)
        train_success = self.clf.fit(epochs.get_data())

        predicts = self.clf.predict(epochs.get_data())
        acc = np.sum(predicts == 0) / predicts.size

        assert train_success
        assert acc >= self.clf.acc_accepted

        epochs_mi = get_epochs(self.raw,
                               tuple(ch_names),
                               'trainSuccess',
                               tmax=0.999)
        predicts = self.clf.predict(epochs_mi.get_data())
        acc = np.sum(predicts == 1) / predicts.size
        assert acc >= self.clf.acc_accepted

def test_pony():
    bdf_file_path = os.path.join(TEST_DATA_PATH, '5_3_right_hand.bdf')
    ch_names = ['C3', 'C4']

    reader = Reader()
    raw = reader.read(bdf_file_path, tuple(ch_names))
    reader.fix_annotation(raw)

    psd = Psd(0.1, 40, 0, 3)
    epochs = psd.get_epochs(raw, tuple(ch_names))
    psd.draw_image(epochs, ch_names, PONY_PSD_FILE_PATH)