# -*- coding: utf-8 -*-
"""Test reading of BrainVision format."""
# Author: Teon Brooks <teon.brooks@gmail.com>
#         Stefan Appelhoff <stefan.appelhoff@mailbox.org>
#
# License: BSD (3-clause)
import os.path as op
import shutil

import numpy as np
from numpy.testing import (assert_array_almost_equal, assert_array_equal,
                           assert_allclose, assert_equal)
import pytest

import datetime
from mne.utils import run_tests_if_main, _stamp_to_dt, object_diff
from mne import pick_types, read_annotations, concatenate_raws
from mne.io.constants import FIFF
from mne.io import read_raw_fif, read_raw_brainvision
from mne.io.tests.test_raw import _test_raw_reader
from mne.datasets import testing
from mne.annotations import events_from_annotations

data_dir = op.join(op.dirname(__file__), 'data')
vhdr_path = op.join(data_dir, 'test.vhdr')
vmrk_path = op.join(data_dir, 'test.vmrk')
eeg_path = op.join(data_dir, 'test.eeg')

vhdr_partially_disabled_hw_filter_path = op.join(data_dir,
                                                 'test_partially_disabled'
                                                 '_hw_filter.vhdr')

vhdr_old_path = op.join(data_dir,
                        'test_old_layout_latin1_software_filter.vhdr')

vhdr_v2_path = op.join(data_dir, 'testv2.vhdr')

vhdr_highpass_path = op.join(data_dir, 'test_highpass.vhdr')
vhdr_mixed_highpass_path = op.join(data_dir, 'test_mixed_highpass.vhdr')
vhdr_highpass_hz_path = op.join(data_dir, 'test_highpass_hz.vhdr')
vhdr_mixed_highpass_hz_path = op.join(data_dir, 'test_mixed_highpass_hz.vhdr')

# Not a typo: we can reuse the highpass file for the lowpass (Hz) test
vhdr_lowpass_path = op.join(data_dir, 'test_highpass.vhdr')
vhdr_mixed_lowpass_path = op.join(data_dir, 'test_mixed_lowpass.vhdr')
vhdr_lowpass_s_path = op.join(data_dir, 'test_lowpass_s.vhdr')
vhdr_mixed_lowpass_s_path = op.join(data_dir, 'test_mixed_lowpass_s.vhdr')

# VHDR exported with neuroone
data_path = testing.data_path(download=False)
neuroone_vhdr = op.join(data_path, 'Brainvision', 'test_NO.vhdr')

# Test for nanovolts as unit
vhdr_units_path = op.join(data_dir, 'test_units.vhdr')

# Test bad date
vhdr_bad_date = op.join(data_dir, 'test_bad_date.vhdr')

eeg_bin = op.join(data_dir, 'test_bin_raw.fif')
eog = ['HL', 'HR', 'Vb']

# XXX: BUG we cannot parse test.hpts FastSCAN file to create a DigMontage
#      (plus I've removed montage from all the read_raw_brainvision and nothing
#       broke, so we were not testing that set_montage in brainvision was
#       working)
#      This should be amend in its own PR.
montage = op.join(data_dir, 'test.hpts')


def test_orig_units(recwarn):
    """Test exposure of original channel units."""
    raw = read_raw_brainvision(vhdr_path)
    orig_units = raw._orig_units
    assert len(orig_units) == 32
    assert orig_units['FP1'] == u'µV'
    assert orig_units['CP5'] == 'n/a'  # originally BS, not a valid unit
    assert orig_units['CP6'] == u'µS'
    assert orig_units['HL'] == 'n/a'  # originally ARU, not a valid unit
    assert orig_units['HR'] == 'n/a'  # originally uS ...
    assert orig_units['Vb'] == 'S'
    assert orig_units['ReRef'] == 'C'


DATE_TEST_CASES = np.array([
    ('Mk1=New Segment,,1,1,0,20131113161403794232\n',  # content
     [1384359243, 794232],  # meas_date internal representation
     '2013-11-13 16:14:03 UTC'),  # meas_date representation

    (('Mk1=New Segment,,1,1,0,20070716122240937454\n'
      'Mk2=New Segment,,2,1,0,20070716122240937455\n'),
     [1184588560, 937454],
     '2007-07-16 12:22:40 UTC'),

    ('Mk1=New Segment,,1,1,0,\nMk2=New Segment,,2,1,0,20070716122240937454\n',
     [1184588560, 937454],
     '2007-07-16 12:22:40 UTC'),

    ('Mk1=STATUS,,1,1,0\n', None, 'unspecified'),
    ('Mk1=New Segment,,1,1,0,\n', None, 'unspecified'),
    ('Mk1=New Segment,,1,1,0\n', None, 'unspecified'),
    ('Mk1=New Segment,,1,1,0,00000000000304125000', None, 'unspecified'),

], dtype=np.dtype({
    'names': ['content', 'meas_date', 'meas_date_repr'],
    'formats': [object, object, 'U22']
}))


@pytest.fixture(scope='session')
def _mocked_meas_date_data(tmpdir_factory):
    """Prepare files for mocked_meas_date_file fixture."""
    # Prepare the files
    tmpdir = str(tmpdir_factory.mktemp('brainvision_mocked_meas_date'))
    vhdr_fname, vmrk_fname, eeg_fname = [
        op.join(tmpdir, op.basename(ff))
        for ff in [vhdr_path, vmrk_path, eeg_path]
    ]
    for orig, dest in zip([vhdr_path, eeg_path], [vhdr_fname, eeg_fname]):
        shutil.copyfile(orig, dest)

    # Get the marker information
    with open(vmrk_path, 'r') as fin:
        lines = fin.readlines()

    return vhdr_fname, vmrk_fname, lines


@pytest.fixture(scope='session', params=[tt for tt in DATE_TEST_CASES])
def mocked_meas_date_file(_mocked_meas_date_data, request):
    """Prepare a generator for use in test_meas_date."""
    MEAS_DATE_LINE = 11  # see test.vmrk file
    vhdr_fname, vmrk_fname, lines = _mocked_meas_date_data

    lines[MEAS_DATE_LINE] = request.param['content']
    with open(vmrk_fname, 'w') as fout:
        fout.writelines(lines)
    meas_date = request.param['meas_date']
    if meas_date is not None:
        meas_date = _stamp_to_dt(meas_date)

    yield vhdr_fname, meas_date, request.param['meas_date_repr']


def test_meas_date(mocked_meas_date_file):
    """Test successful extraction of measurement date."""
    vhdr_f, expected_meas, expected_meas_repr = mocked_meas_date_file
    raw = read_raw_brainvision(vhdr_f)
    assert expected_meas_repr in repr(raw.info)
    if expected_meas is None:
        assert raw.info['meas_date'] is None
    else:
        assert raw.info['meas_date'] == expected_meas


def test_vhdr_codepage_ansi(tmpdir):
    """Test BV reading with ANSI codepage."""
    raw_init = read_raw_brainvision(vhdr_path)
    data_expected, times_expected = raw_init[:]
    tempdir = str(tmpdir)
    ansi_vhdr_path = op.join(tempdir, op.split(vhdr_path)[-1])
    ansi_vmrk_path = op.join(tempdir, op.split(vmrk_path)[-1])
    ansi_eeg_path = op.join(tempdir, op.split(eeg_path)[-1])
    # copy data file
    shutil.copy(eeg_path, ansi_eeg_path)
    # modify header file
    with open(ansi_vhdr_path, 'wb') as fout:
        with open(vhdr_path, 'rb') as fin:
            for line in fin:
                # Common Infos section
                if line.startswith(b'Codepage'):
                    line = b'Codepage=ANSI\n'
                fout.write(line)
    # modify marker file
    with open(ansi_vmrk_path, 'wb') as fout:
        with open(vmrk_path, 'rb') as fin:
            for line in fin:
                # Common Infos section
                if line.startswith(b'Codepage'):
                    line = b'Codepage=ANSI\n'
                fout.write(line)

    raw = read_raw_brainvision(ansi_vhdr_path)
    data_new, times_new = raw[:]

    assert_equal(raw_init.ch_names, raw.ch_names)
    assert_allclose(data_new, data_expected, atol=1e-15)
    assert_allclose(times_new, times_expected, atol=1e-15)


@pytest.mark.parametrize('header', [
    b'BrainVision Data Exchange %s File Version 1.0\n',
    # 2.0, space, core, comma
    b'Brain Vision Core Data Exchange %s File, Version 2.0\n',
    # bad
    b'Brain Vision Core Data Exchange %s File, Version 3.0\n',
])
def test_vhdr_versions(tmpdir, header):
    """Test BV reading with different header variants."""
    raw_init = read_raw_brainvision(vhdr_path)
    data_expected, times_expected = raw_init[:]
    use_vhdr_path = op.join(tmpdir, op.split(vhdr_path)[-1])
    use_vmrk_path = op.join(tmpdir, op.split(vmrk_path)[-1])
    use_eeg_path = op.join(tmpdir, op.split(eeg_path)[-1])
    shutil.copy(eeg_path, use_eeg_path)
    with open(use_vhdr_path, 'wb') as fout:
        with open(vhdr_path, 'rb') as fin:
            for line in fin:
                # Common Infos section
                if line.startswith(b'Brain'):
                    line = header % b'Header'
                fout.write(line)
    with open(use_vmrk_path, 'wb') as fout:
        with open(vmrk_path, 'rb') as fin:
            for line in fin:
                # Common Infos section
                if line.startswith(b'Brain'):
                    line = header % b'Marker'
                fout.write(line)

    if b'3.0' in header:  # bad case
        with pytest.raises(ValueError, match=r'3\.0.*Contact MNE-Python'):
            read_raw_brainvision(use_vhdr_path)
        return
    raw = read_raw_brainvision(use_vhdr_path)
    data_new, _ = raw[:]
    assert_allclose(data_new, data_expected, atol=1e-15)


def test_ascii(tmpdir):
    """Test ASCII BV reading."""
    raw = read_raw_brainvision(vhdr_path)
    ascii_vhdr_path = op.join(tmpdir, op.split(vhdr_path)[-1])
    # copy marker file
    shutil.copy(vhdr_path.replace('.vhdr', '.vmrk'),
                ascii_vhdr_path.replace('.vhdr', '.vmrk'))
    # modify header file
    skipping = False
    with open(ascii_vhdr_path, 'wb') as fout:
        with open(vhdr_path, 'rb') as fin:
            for line in fin:
                # Common Infos section
                if line.startswith(b'DataFormat'):
                    line = b'DataFormat=ASCII\n'
                elif line.startswith(b'DataFile='):
                    line = b'DataFile=test.dat\n'
                # Replace the "'Binary Infos'" section
                elif line.startswith(b'[Binary Infos]'):
                    skipping = True
                    fout.write(b'[ASCII Infos]\nDecimalSymbol=.\nSkipLines=1\n'
                               b'SkipColumns=0\n\n')
                elif skipping and line.startswith(b'['):
                    skipping = False
                if not skipping:
                    fout.write(line)
    # create the .dat file
    data, times = raw[:]
    with open(ascii_vhdr_path.replace('.vhdr', '.dat'), 'wb') as fid:
        fid.write(b' '.join(ch_name.encode('ASCII')
                            for ch_name in raw.ch_names) + b'\n')
        fid.write(b'\n'.join(b' '.join(b'%.3f' % dd for dd in d)
                             for d in data.T / raw._cals))
    raw = read_raw_brainvision(ascii_vhdr_path)
    data_new, times_new = raw[:]
    assert_allclose(data_new, data, atol=1e-15)
    assert_allclose(times_new, times)


def test_brainvision_data_highpass_filters():
    """Test reading raw Brain Vision files with amplifier filter settings."""
    # Homogeneous highpass in seconds (default measurement unit)
    raw = _test_raw_reader(
        read_raw_brainvision, vhdr_fname=vhdr_highpass_path, eog=eog
    )

    assert_equal(raw.info['highpass'], 1. / (2 * np.pi * 10))
    assert_equal(raw.info['lowpass'], 250.)

    # Heterogeneous highpass in seconds (default measurement unit)
    with pytest.warns(RuntimeWarning, match='different .*pass filters') as w:
        raw = _test_raw_reader(
            read_raw_brainvision, vhdr_fname=vhdr_mixed_highpass_path,
            eog=eog)

    lowpass_warning = ['different lowpass filters' in str(ww.message)
                       for ww in w]
    highpass_warning = ['different highpass filters' in str(ww.message)
                        for ww in w]

    expected_warnings = zip(lowpass_warning, highpass_warning)

    assert (all(any([lp, hp]) for lp, hp in expected_warnings))

    assert_equal(raw.info['highpass'], 1. / (2 * np.pi * 10))
    assert_equal(raw.info['lowpass'], 250.)

    # Homogeneous highpass in Hertz
    raw = _test_raw_reader(
        read_raw_brainvision, vhdr_fname=vhdr_highpass_hz_path,
        eog=eog)

    assert_equal(raw.info['highpass'], 10.)
    assert_equal(raw.info['lowpass'], 250.)

    # Heterogeneous highpass in Hertz
    with pytest.warns(RuntimeWarning, match='different .*pass filters') as w:
        raw = _test_raw_reader(
            read_raw_brainvision, vhdr_fname=vhdr_mixed_highpass_hz_path,
            eog=eog)

    trigger_warning = ['will be dropped' in str(ww.message)
                       for ww in w]
    lowpass_warning = ['different lowpass filters' in str(ww.message)
                       for ww in w]
    highpass_warning = ['different highpass filters' in str(ww.message)
                        for ww in w]

    expected_warnings = zip(trigger_warning, lowpass_warning, highpass_warning)

    assert (all(any([trg, lp, hp]) for trg, lp, hp in expected_warnings))

    assert_equal(raw.info['highpass'], 5.)
    assert_equal(raw.info['lowpass'], 250.)


def test_brainvision_data_lowpass_filters():
    """Test files with amplifier LP filter settings."""
    # Homogeneous lowpass in Hertz (default measurement unit)
    raw = _test_raw_reader(
        read_raw_brainvision, vhdr_fname=vhdr_lowpass_path, eog=eog
    )

    assert_equal(raw.info['highpass'], 1. / (2 * np.pi * 10))
    assert_equal(raw.info['lowpass'], 250.)

    # Heterogeneous lowpass in Hertz (default measurement unit)
    with pytest.warns(RuntimeWarning) as w:  # event parsing
        raw = _test_raw_reader(
            read_raw_brainvision, vhdr_fname=vhdr_mixed_lowpass_path, eog=eog
        )

    lowpass_warning = ['different lowpass filters' in str(ww.message)
                       for ww in w]
    highpass_warning = ['different highpass filters' in str(ww.message)
                        for ww in w]

    expected_warnings = zip(lowpass_warning, highpass_warning)

    assert (all(any([lp, hp]) for lp, hp in expected_warnings))

    assert_equal(raw.info['highpass'], 1. / (2 * np.pi * 10))
    assert_equal(raw.info['lowpass'], 250.)

    # Homogeneous lowpass in seconds
    raw = _test_raw_reader(
        read_raw_brainvision, vhdr_fname=vhdr_lowpass_s_path, eog=eog
    )

    assert_equal(raw.info['highpass'], 1. / (2 * np.pi * 10))
    assert_equal(raw.info['lowpass'], 1. / (2 * np.pi * 0.004))

    # Heterogeneous lowpass in seconds
    with pytest.warns(RuntimeWarning) as w:  # filter settings
        raw = _test_raw_reader(
            read_raw_brainvision, vhdr_fname=vhdr_mixed_lowpass_s_path, eog=eog
        )

    lowpass_warning = ['different lowpass filters' in str(ww.message)
                       for ww in w]
    highpass_warning = ['different highpass filters' in str(ww.message)
                        for ww in w]

    expected_warnings = zip(lowpass_warning, highpass_warning)

    assert (all(any([lp, hp]) for lp, hp in expected_warnings))

    assert_equal(raw.info['highpass'], 1. / (2 * np.pi * 10))
    assert_equal(raw.info['lowpass'], 1. / (2 * np.pi * 0.004))


def test_brainvision_data_partially_disabled_hw_filters():
    """Test heterogeneous filter settings including non-numeric values."""
    with pytest.warns(RuntimeWarning) as w:  # event parsing
        raw = _test_raw_reader(
            read_raw_brainvision,
            vhdr_fname=vhdr_partially_disabled_hw_filter_path, eog=eog
        )

    trigger_warning = ['will be dropped' in str(ww.message)
                       for ww in w]
    lowpass_warning = ['different lowpass filters' in str(ww.message)
                       for ww in w]
    highpass_warning = ['different highpass filters' in str(ww.message)
                        for ww in w]

    expected_warnings = zip(trigger_warning, lowpass_warning, highpass_warning)

    assert (all(any([trg, lp, hp]) for trg, lp, hp in expected_warnings))

    assert_equal(raw.info['highpass'], 0.)
    assert_equal(raw.info['lowpass'], 500.)


def test_brainvision_data_software_filters_latin1_global_units():
    """Test reading raw Brain Vision files."""
    with pytest.warns(RuntimeWarning, match='software filter'):
        raw = _test_raw_reader(
            read_raw_brainvision, vhdr_fname=vhdr_old_path,
            eog=("VEOGo", "VEOGu", "HEOGli", "HEOGre"), misc=("A2",))

    assert_equal(raw.info['highpass'], 1. / (2 * np.pi * 0.9))
    assert_equal(raw.info['lowpass'], 50.)


def test_brainvision_data():
    """Test reading raw Brain Vision files."""
    pytest.raises(IOError, read_raw_brainvision, vmrk_path)
    pytest.raises(ValueError, read_raw_brainvision, vhdr_path,
                  preload=True, scale="foo")

    raw_py = _test_raw_reader(
        read_raw_brainvision, vhdr_fname=vhdr_path, eog=eog, misc='auto'
    )

    assert ('RawBrainVision' in repr(raw_py))

    assert_equal(raw_py.info['highpass'], 0.)
    assert_equal(raw_py.info['lowpass'], 250.)

    picks = pick_types(raw_py.info, meg=False, eeg=True, exclude='bads')
    data_py, times_py = raw_py[picks]

    # compare with a file that was generated using MNE-C
    raw_bin = read_raw_fif(eeg_bin, preload=True)
    picks = pick_types(raw_py.info, meg=False, eeg=True, exclude='bads')
    data_bin, times_bin = raw_bin[picks]

    assert_array_almost_equal(data_py, data_bin)
    assert_array_almost_equal(times_py, times_bin)

    # Make sure EOG channels are marked correctly
    for ch in raw_py.info['chs']:
        if ch['ch_name'] in eog:
            assert_equal(ch['kind'], FIFF.FIFFV_EOG_CH)
        elif ch['ch_name'] == 'STI 014':
            assert_equal(ch['kind'], FIFF.FIFFV_STIM_CH)
        elif ch['ch_name'] in ('CP5', 'CP6'):
            assert_equal(ch['kind'], FIFF.FIFFV_MISC_CH)
            assert_equal(ch['unit'], FIFF.FIFF_UNIT_NONE)
        elif ch['ch_name'] == 'ReRef':
            assert_equal(ch['kind'], FIFF.FIFFV_MISC_CH)
            assert_equal(ch['unit'], FIFF.FIFF_UNIT_CEL)
        elif ch['ch_name'] in raw_py.info['ch_names']:
            assert_equal(ch['kind'], FIFF.FIFFV_EEG_CH)
            assert_equal(ch['unit'], FIFF.FIFF_UNIT_V)
        else:
            raise RuntimeError("Unknown Channel: %s" % ch['ch_name'])

    # test loading v2
    read_raw_brainvision(vhdr_v2_path, eog=eog, preload=True,
                         verbose='error')
    # test different units with alternative header file
    raw_units = _test_raw_reader(
        read_raw_brainvision, vhdr_fname=vhdr_units_path, eog=eog, misc='auto'
    )
    assert_equal(raw_units.info['chs'][0]['ch_name'], 'FP1')
    assert_equal(raw_units.info['chs'][0]['kind'], FIFF.FIFFV_EEG_CH)
    data_units, _ = raw_units[0]
    assert_array_almost_equal(data_py[0, :], data_units.squeeze())

    assert_equal(raw_units.info['chs'][1]['ch_name'], 'FP2')
    assert_equal(raw_units.info['chs'][1]['kind'], FIFF.FIFFV_EEG_CH)
    data_units, _ = raw_units[1]
    assert_array_almost_equal(data_py[1, :], data_units.squeeze())

    assert_equal(raw_units.info['chs'][2]['ch_name'], 'F3')
    assert_equal(raw_units.info['chs'][2]['kind'], FIFF.FIFFV_EEG_CH)
    data_units, _ = raw_units[2]
    assert_array_almost_equal(data_py[2, :], data_units.squeeze())


def test_brainvision_vectorized_data():
    """Test reading BrainVision data files with vectorized data."""
    with pytest.warns(RuntimeWarning, match='software filter'):
        raw = read_raw_brainvision(vhdr_old_path, preload=True)

    assert_array_equal(raw._data.shape, (29, 251))

    first_two_samples_all_chs = np.array([[+5.22000008e-06, +5.10000000e-06],
                                          [+2.10000000e-06, +2.27000008e-06],
                                          [+1.15000000e-06, +1.33000002e-06],
                                          [+4.00000000e-07, +4.00000000e-07],
                                          [-3.02999992e-06, -2.82000008e-06],
                                          [+2.71000004e-06, +2.45000000e-06],
                                          [+2.41000004e-06, +2.36000004e-06],
                                          [+1.01999998e-06, +1.18000002e-06],
                                          [-1.33999996e-06, -1.25000000e-06],
                                          [-2.60000000e-06, -2.46000004e-06],
                                          [+6.80000019e-07, +8.00000000e-07],
                                          [+1.48000002e-06, +1.48999996e-06],
                                          [+1.61000004e-06, +1.51000004e-06],
                                          [+7.19999981e-07, +8.60000038e-07],
                                          [-3.00000000e-07, -4.00000006e-08],
                                          [-1.20000005e-07, +6.00000024e-08],
                                          [+8.19999981e-07, +9.89999962e-07],
                                          [+1.13000002e-06, +1.28000002e-06],
                                          [+1.08000002e-06, +1.33999996e-06],
                                          [+2.20000005e-07, +5.69999981e-07],
                                          [-4.09999990e-07, +4.00000006e-08],
                                          [+5.19999981e-07, +9.39999962e-07],
                                          [+1.01000004e-06, +1.51999998e-06],
                                          [+1.01000004e-06, +1.55000000e-06],
                                          [-1.43000002e-06, -1.13999996e-06],
                                          [+3.65000000e-06, +3.65999985e-06],
                                          [+4.15999985e-06, +3.79000015e-06],
                                          [+9.26999969e-06, +8.95999985e-06],
                                          [-7.35999985e-06, -7.18000031e-06],
                                          ])

    assert_array_almost_equal(raw._data[:, :2], first_two_samples_all_chs)


def test_coodinates_extraction():
    """Test reading of [Coordinates] section if present."""
    # vhdr 2 has a Coordinates section
    with pytest.warns(RuntimeWarning, match='coordinate information'):
        raw = read_raw_brainvision(vhdr_v2_path)

    # Basic check of extracted coordinates
    assert raw.info['dig'] is not None
    diglist = raw.info['dig']
    coords = np.array([dig['r'] for dig in diglist])
    EXPECTED_SHAPE = (
        len(raw.ch_names) - 4,  # HL, HR, Vb, ReRef are not set in dig
        3,
    )
    assert coords.shape == EXPECTED_SHAPE

    # Make sure the scaling seems right
    # a coordinate more than 20cm away from origin is implausible
    assert coords.max() < 0.2

    # vhdr 1 does not have a Coordinates section
    raw2 = read_raw_brainvision(vhdr_path)
    assert raw2.info['dig'] is None


@testing.requires_testing_data
def test_brainvision_neuroone_export():
    """Test Brainvision file exported with neuroone system."""
    raw = read_raw_brainvision(neuroone_vhdr, verbose='error')
    assert raw.info['meas_date'] is None
    assert len(raw.info['chs']) == 65
    assert raw.info['sfreq'] == 5000.


@testing.requires_testing_data
def test_read_vmrk_annotations(tmpdir):
    """Test load brainvision annotations."""
    sfreq = 1000.0

    # Test vmrk file without annotations
    # delete=False is for Windows compatibility
    with open(vmrk_path) as myfile:
        head = [next(myfile) for x in range(6)]
    fname = tmpdir.join('temp.vmrk')
    with open(str(fname), 'w') as temp:
        for item in head:
            temp.write(item)
    read_annotations(fname, sfreq=sfreq)


@testing.requires_testing_data
def test_read_vhdr_annotations_and_events():
    """Test load brainvision annotations and parse them to events."""
    sfreq = 1000.0
    expected_orig_time = _stamp_to_dt((1384359243, 794232))
    expected_onset_latency = np.array(
        [0, 486., 496., 1769., 1779., 3252., 3262., 4935., 4945., 5999., 6619.,
         6629., 7629., 7699.]
    )
    expected_annot_description = [
        'New Segment/', 'Stimulus/S253', 'Stimulus/S255', 'Event/254',
        'Stimulus/S255', 'Event/254', 'Stimulus/S255', 'Stimulus/S253',
        'Stimulus/S255', 'Response/R255', 'Event/254', 'Stimulus/S255',
        'SyncStatus/Sync On', 'Optic/O  1'
    ]
    expected_events = np.stack([
        expected_onset_latency,
        np.zeros_like(expected_onset_latency),
        [99999, 253, 255, 254, 255, 254, 255, 253, 255, 1255, 254, 255, 99998,
         2001],
    ]).astype('int64').T
    expected_event_id = {'New Segment/': 99999, 'Stimulus/S253': 253,
                         'Stimulus/S255': 255, 'Event/254': 254,
                         'Response/R255': 1255, 'SyncStatus/Sync On': 99998,
                         'Optic/O  1': 2001}

    raw = read_raw_brainvision(vhdr_path, eog=eog)

    # validate annotations
    assert raw.annotations.orig_time == expected_orig_time
    assert_allclose(raw.annotations.onset, expected_onset_latency / sfreq)
    assert_array_equal(raw.annotations.description, expected_annot_description)

    # validate event extraction
    events, event_id = events_from_annotations(raw)
    assert_array_equal(events, expected_events)
    assert event_id == expected_event_id

    # validate that None gives us a sorted list
    expected_none_event_id = {desc: idx + 1 for idx, desc in enumerate(sorted(
        event_id.keys()))}
    events, event_id = events_from_annotations(raw, event_id=None)
    assert event_id == expected_none_event_id

    # Add some custom ones, plus a 2-digit one
    s_10 = 'Stimulus/S 10'
    raw.annotations.append([1, 2, 3], 10, ['ZZZ', s_10, 'YYY'])
    expected_event_id.update(YYY=10001, ZZZ=10002)  # others starting at 10001
    expected_event_id[s_10] = 10
    _, event_id = events_from_annotations(raw)
    assert event_id == expected_event_id

    # Concatenating two shouldn't change the resulting event_id
    # (BAD and EDGE should be ignored)
    with pytest.warns(RuntimeWarning, match='expanding outside'):
        raw_concat = concatenate_raws([raw.copy(), raw.copy()])
    _, event_id = events_from_annotations(raw_concat)
    assert event_id == expected_event_id


@testing.requires_testing_data
def test_automatic_vmrk_sfreq_recovery():
    """Test proper sfreq inference by checking the onsets."""
    assert_array_equal(read_annotations(vmrk_path, sfreq='auto'),
                       read_annotations(vmrk_path, sfreq=1000.0))


@testing.requires_testing_data
def test_event_id_stability_when_save_and_fif_reload(tmpdir):
    """Test load events from brainvision annotations when read_raw_fif."""
    fname = op.join(str(tmpdir), 'bv-raw.fif')
    raw = read_raw_brainvision(vhdr_path, eog=eog)
    original_events, original_event_id = events_from_annotations(raw)

    raw.save(fname)
    raw = read_raw_fif(fname)
    events, event_id = events_from_annotations(raw)

    assert event_id == original_event_id
    assert_array_equal(events, original_events)


def test_parse_impedance():
    """Test case for parsing the impedances from header."""
    expected_imp_meas_time = datetime.datetime(2013, 11, 13, 16, 12, 27,
                                               tzinfo=datetime.timezone.utc)
    expected_imp_unit = 'kOhm'
    expected_electrodes = [
        'FP1', 'FP2', 'F3', 'F4', 'C3', 'C4', 'P3', 'P4', 'O1', 'O2', 'F7',
        'F8', 'P7', 'P8', 'Fz', 'FCz', 'Cz', 'CPz', 'Pz', 'POz', 'FC1', 'FC2',
        'CP1', 'CP2', 'FC5', 'FC6', 'CP5', 'CP6', 'HL', 'HR', 'Vb', 'ReRef',
        'Ref', 'Gnd'
    ]
    n_electrodes = len(expected_electrodes)
    expected_imps = [np.nan] * (n_electrodes - 2) + [0., 4.]
    expected_imp_lower_bound = 0.
    expected_imp_upper_bound = [100.] * (n_electrodes - 2) + [10., 10.]

    expected_impedances = {elec: {
        'imp': expected_imps[i],
        'imp_unit': expected_imp_unit,
        'imp_meas_time': expected_imp_meas_time,
        'imp_lower_bound': expected_imp_lower_bound,
        'imp_upper_bound': expected_imp_upper_bound[i],
        'imp_range_unit': expected_imp_unit,
    } for i, elec in enumerate(expected_electrodes)}

    raw = read_raw_brainvision(vhdr_path, eog=eog)
    assert object_diff(expected_impedances, raw.impedances) == ''

    # Test "Impedances Imported from actiCAP Control Software"
    expected_imp_meas_time = expected_imp_meas_time.replace(hour=10,
                                                            minute=17,
                                                            second=2)
    tmpidx = expected_electrodes.index('CP6')
    expected_electrodes = expected_electrodes[:tmpidx] + [
        'CP 6', 'ECG+', 'ECG-', 'HEOG+', 'HEOG-', 'VEOG+', 'VEOG-', 'ReRef',
        'Ref', 'Gnd'
    ]
    n_electrodes = len(expected_electrodes)
    expected_imps = [np.nan] * (n_electrodes - 9) + [
        35., 46., 6., 8., 3., 4., 0., 8., 2.5
    ]
    expected_impedances = {elec: {
        'imp': expected_imps[i],
        'imp_unit': expected_imp_unit,
        'imp_meas_time': expected_imp_meas_time,
    } for i, elec in enumerate(expected_electrodes)}

    with pytest.warns(RuntimeWarning, match='different .*pass filters'):
        raw = read_raw_brainvision(vhdr_mixed_lowpass_path,
                                   eog=['HEOG', 'VEOG'], misc=['ECG'])
    assert object_diff(expected_impedances, raw.impedances) == ''


run_tests_if_main()
