# Authors: The MNE-Python contributors.
# License: BSD-3-Clause
# Copyright the MNE-Python contributors.

import copy
import os
import shutil
from datetime import datetime, timezone
from os import path as op

import numpy as np
import pytest
from numpy import array_equal
from numpy.testing import assert_allclose, assert_array_equal

import mne
import mne.io.ctf.info
from mne import (
    create_info,
    events_from_annotations,
    make_forward_solution,
    pick_types,
    read_annotations,
)
from mne._fiff.compensator import get_current_comp
from mne._fiff.constants import FIFF
from mne._fiff.pick import _picks_to_idx
from mne.datasets import brainstorm, spm_face, testing
from mne.io import RawArray, read_raw_ctf, read_raw_fif
from mne.io.ctf.constants import CTF
from mne.io.ctf.info import _convert_time
from mne.io.tests.test_raw import _test_raw_reader
from mne.tests.test_annotations import _assert_annotations_equal
from mne.transforms import apply_trans
from mne.utils import _clean_names, _record_warnings, _stamp_to_dt, catch_logging

ctf_dir = testing.data_path(download=False) / "CTF"
ctf_fname_continuous = "testdata_ctf.ds"
ctf_fname_1_trial = "testdata_ctf_short.ds"
ctf_fname_2_trials = "testdata_ctf_pseudocontinuous.ds"
ctf_fname_discont = "testdata_ctf_short_discontinuous.ds"
ctf_fname_somato = "somMDYO-18av.ds"
ctf_fname_catch = "catch-alp-good-f.ds"
somato_fname = op.join(
    brainstorm.bst_raw.data_path(download=False),
    "MEG",
    "bst_raw",
    "subj001_somatosensory_20111109_01_AUX-f.ds",
)
spm_path = spm_face.data_path(download=False)

block_sizes = {
    ctf_fname_continuous: 12000,
    ctf_fname_1_trial: 4801,
    ctf_fname_2_trials: 12000,
    ctf_fname_discont: 1201,
    ctf_fname_somato: 313,
    ctf_fname_catch: 2500,
}
single_trials = (
    ctf_fname_continuous,
    ctf_fname_1_trial,
)

ctf_fnames = tuple(sorted(block_sizes.keys()))


@pytest.mark.slowtest
@testing.requires_testing_data
def test_read_ctf(tmp_path):
    """Test CTF reader."""
    temp_dir = str(tmp_path)
    out_fname = op.join(temp_dir, "test_py_raw.fif")

    # Create a dummy .eeg file so we can test our reading/application of it
    os.mkdir(op.join(temp_dir, "randpos"))
    ctf_eeg_fname = op.join(temp_dir, "randpos", ctf_fname_catch)
    shutil.copytree(op.join(ctf_dir, ctf_fname_catch), ctf_eeg_fname)
    with pytest.warns(RuntimeWarning, match="RMSP .* changed to a MISC ch"):
        raw = _test_raw_reader(read_raw_ctf, directory=ctf_eeg_fname)
    picks = pick_types(raw.info, meg=False, eeg=True)
    pos = np.random.RandomState(42).randn(len(picks), 3)
    fake_eeg_fname = op.join(ctf_eeg_fname, "catch-alp-good-f.eeg")
    # Create a bad file
    with open(fake_eeg_fname, "wb") as fid:
        fid.write("foo\n".encode("ascii"))
    pytest.raises(RuntimeError, read_raw_ctf, ctf_eeg_fname)
    # Create a good file
    with open(fake_eeg_fname, "wb") as fid:
        for ii, ch_num in enumerate(picks):
            args = (
                str(ch_num + 1),
                raw.ch_names[ch_num],
            ) + tuple(f"{x:0.5f}" for x in 100 * pos[ii])  # convert to cm
            fid.write(("\t".join(args) + "\n").encode("ascii"))
    pos_read_old = np.array([raw.info["chs"][p]["loc"][:3] for p in picks])
    with pytest.warns(RuntimeWarning, match="RMSP .* changed to a MISC ch"):
        raw = read_raw_ctf(ctf_eeg_fname)  # read modified data
    pos_read = np.array([raw.info["chs"][p]["loc"][:3] for p in picks])
    assert_allclose(
        apply_trans(raw.info["ctf_head_t"], pos), pos_read, rtol=1e-5, atol=1e-5
    )
    assert (pos_read == pos_read_old).mean() < 0.1
    shutil.copy(
        op.join(ctf_dir, "catch-alp-good-f.ds_randpos_raw.fif"),
        op.join(temp_dir, "randpos", "catch-alp-good-f.ds_raw.fif"),
    )

    # Create a version with no hc, starting out *with* EEG pos (error)
    os.mkdir(op.join(temp_dir, "nohc"))
    ctf_no_hc_fname = op.join(temp_dir, "no_hc", ctf_fname_catch)
    shutil.copytree(ctf_eeg_fname, ctf_no_hc_fname)
    remove_base = op.join(ctf_no_hc_fname, op.basename(ctf_fname_catch[:-3]))
    os.remove(remove_base + ".hc")
    with _record_warnings(), pytest.warns(RuntimeWarning, match="MISC channel"):
        pytest.raises(RuntimeError, read_raw_ctf, ctf_no_hc_fname)
    os.remove(remove_base + ".eeg")
    shutil.copy(
        op.join(ctf_dir, "catch-alp-good-f.ds_nohc_raw.fif"),
        op.join(temp_dir, "no_hc", "catch-alp-good-f.ds_raw.fif"),
    )

    # All our files
    use_fnames = [op.join(ctf_dir, c) for c in ctf_fnames]
    for fname in use_fnames:
        raw_c = read_raw_fif(fname + "_raw.fif", preload=True)
        # sometimes matches "MISC channel"
        with _record_warnings():
            raw = read_raw_ctf(fname)

        # check info match
        assert_array_equal(raw.ch_names, raw_c.ch_names)
        assert_allclose(raw.times, raw_c.times)
        assert_allclose(raw._cals, raw_c._cals)
        assert raw.info["meas_id"]["version"] == raw_c.info["meas_id"]["version"] + 1
        for t in ("dev_head_t", "dev_ctf_t", "ctf_head_t"):
            assert_allclose(
                raw.info[t]["trans"], raw_c.info[t]["trans"], rtol=1e-4, atol=1e-7
            )
        # XXX 2019/11/29 : MNC-C FIF conversion files don't have meas_date set.
        # Consider adding meas_date to below checks once this is addressed in
        # MNE-C
        for key in (
            "acq_pars",
            "acq_stim",
            "bads",
            "ch_names",
            "custom_ref_applied",
            "description",
            "events",
            "experimenter",
            "highpass",
            "line_freq",
            "lowpass",
            "nchan",
            "proj_id",
            "proj_name",
            "projs",
            "sfreq",
            "subject_info",
        ):
            assert raw.info[key] == raw_c.info[key], key
        if op.basename(fname) not in single_trials:
            # We don't force buffer size to be smaller like MNE-C
            assert raw.buffer_size_sec == raw_c.buffer_size_sec
        assert len(raw.info["comps"]) == len(raw_c.info["comps"])
        for c1, c2 in zip(raw.info["comps"], raw_c.info["comps"]):
            for key in ("colcals", "rowcals"):
                assert_allclose(c1[key], c2[key])
            assert c1["save_calibrated"] == c2["save_calibrated"]
            for key in ("row_names", "col_names", "nrow", "ncol"):
                assert_array_equal(c1["data"][key], c2["data"][key])
            assert_allclose(
                c1["data"]["data"], c2["data"]["data"], atol=1e-7, rtol=1e-5
            )
        assert_allclose(
            raw.info["hpi_results"][0]["coord_trans"]["trans"],
            raw_c.info["hpi_results"][0]["coord_trans"]["trans"],
            rtol=1e-5,
            atol=1e-7,
        )
        assert len(raw.info["chs"]) == len(raw_c.info["chs"])
        for ii, (c1, c2) in enumerate(zip(raw.info["chs"], raw_c.info["chs"])):
            for key in (
                "kind",
                "scanno",
                "unit",
                "ch_name",
                "unit_mul",
                "range",
                "coord_frame",
                "coil_type",
                "logno",
            ):
                if (
                    c1["ch_name"] == "RMSP"
                    and "catch-alp-good-f" in fname
                    and key in ("kind", "unit", "coord_frame", "coil_type", "logno")
                ):
                    continue  # XXX see below...
                if key == "coil_type" and c1[key] == FIFF.FIFFV_COIL_EEG:
                    # XXX MNE-C bug that this is not set
                    assert c2[key] == FIFF.FIFFV_COIL_NONE
                    continue
                assert c1[key] == c2[key], key
            for key in ("cal",):
                assert_allclose(
                    c1[key],
                    c2[key],
                    atol=1e-6,
                    rtol=1e-4,
                    err_msg=f'raw.info["chs"][{ii}][{key}]',
                )
            # XXX 2016/02/24: fixed bug with normal computation that used
            # to exist, once mne-C tools are updated we should update our FIF
            # conversion files, then the slices can go away (and the check
            # can be combined with that for "cal")
            for key in ("loc",):
                if c1["ch_name"] == "RMSP" and "catch-alp-good-f" in fname:
                    continue
                if (c2[key][:3] == 0.0).all():
                    check = [np.nan] * 3
                else:
                    check = c2[key][:3]
                assert_allclose(
                    c1[key][:3],
                    check,
                    atol=1e-6,
                    rtol=1e-4,
                    err_msg=f'raw.info["chs"][{ii}][{key}]',
                )
                if (c2[key][3:] == 0.0).all():
                    check = [np.nan] * 3
                else:
                    check = c2[key][9:12]
                assert_allclose(
                    c1[key][9:12],
                    check,
                    atol=1e-6,
                    rtol=1e-4,
                    err_msg=f'raw.info["chs"][{ii}][{key}]',
                )

        # Make sure all digitization points are in the MNE head coord frame
        for p in raw.info["dig"]:
            assert p["coord_frame"] == FIFF.FIFFV_COORD_HEAD, (
                "dig points must be in FIFF.FIFFV_COORD_HEAD"
            )

        if fname.endswith("catch-alp-good-f.ds"):  # omit points from .pos file
            with raw.info._unlock():
                raw.info["dig"] = raw.info["dig"][:-10]

        # XXX: Next test would fail because c-tools assign the fiducials from
        # CTF data as HPI. Should eventually clarify/unify with Matti.
        # assert_dig_allclose(raw.info, raw_c.info)

        # check data match
        raw_c.save(out_fname, overwrite=True, buffer_size_sec=1.0)
        raw_read = read_raw_fif(out_fname)

        # so let's check tricky cases based on sample boundaries
        rng = np.random.RandomState(0)
        pick_ch = rng.permutation(np.arange(len(raw.ch_names)))[:10]
        bnd = int(round(raw.info["sfreq"] * raw.buffer_size_sec))
        assert bnd == raw._raw_extras[0]["block_size"]
        assert bnd == block_sizes[op.basename(fname)]
        slices = (
            slice(0, bnd),
            slice(bnd - 1, bnd),
            slice(3, bnd),
            slice(3, 300),
            slice(None),
        )
        if len(raw.times) >= 2 * bnd:  # at least two complete blocks
            slices = slices + (
                slice(bnd, 2 * bnd),
                slice(bnd, bnd + 1),
                slice(0, bnd + 100),
            )
        for sl_time in slices:
            assert_allclose(raw[pick_ch, sl_time][0], raw_c[pick_ch, sl_time][0])
            assert_allclose(raw_read[pick_ch, sl_time][0], raw_c[pick_ch, sl_time][0])
        # all data / preload
        raw.load_data()
        assert_allclose(raw[:][0], raw_c[:][0], atol=1e-15)
        # test bad segment annotations
        if "testdata_ctf_short.ds" in fname:
            assert "bad" in raw.annotations.description[0]
            assert_allclose(raw.annotations.onset, [2.15])
            assert_allclose(raw.annotations.duration, [0.0225])

    with pytest.raises(TypeError, match="path-like"):
        read_raw_ctf(1)
    with pytest.raises(FileNotFoundError, match="does not exist"):
        read_raw_ctf(ctf_fname_continuous + "foo.ds")
    # test ignoring of system clock
    read_raw_ctf(op.join(ctf_dir, ctf_fname_continuous), "ignore")
    with pytest.raises(ValueError, match="system_clock"):
        read_raw_ctf(op.join(ctf_dir, ctf_fname_continuous), "foo")


@testing.requires_testing_data
def test_rawctf_clean_names():
    """Test RawCTF _clean_names method."""
    # read test data
    with pytest.warns(RuntimeWarning, match="ref channel RMSP did not"):
        raw = read_raw_ctf(op.join(ctf_dir, ctf_fname_catch))
        raw_cleaned = read_raw_ctf(op.join(ctf_dir, ctf_fname_catch), clean_names=True)
    test_channel_names = _clean_names(raw.ch_names)
    test_info_comps = copy.deepcopy(raw.info["comps"])

    # channel names should not be cleaned by default
    assert raw.ch_names != test_channel_names

    chs_ch_names = [ch["ch_name"] for ch in raw.info["chs"]]

    assert chs_ch_names != test_channel_names

    for test_comp, comp in zip(test_info_comps, raw.info["comps"]):
        for key in ("row_names", "col_names"):
            assert not array_equal(
                _clean_names(test_comp["data"][key]), comp["data"][key]
            )

    # channel names should be cleaned if clean_names=True
    assert raw_cleaned.ch_names == test_channel_names

    for ch, test_ch_name in zip(raw_cleaned.info["chs"], test_channel_names):
        assert ch["ch_name"] == test_ch_name

    for test_comp, comp in zip(test_info_comps, raw_cleaned.info["comps"]):
        for key in ("row_names", "col_names"):
            assert _clean_names(test_comp["data"][key]) == comp["data"][key]


@spm_face.requires_spm_data
def test_read_spm_ctf():
    """Test CTF reader with omitted samples."""
    raw_fname = op.join(spm_path, "MEG", "spm", "SPM_CTF_MEG_example_faces1_3D.ds")
    raw = read_raw_ctf(raw_fname)
    extras = raw._raw_extras[0]
    assert extras["n_samp"] == raw.n_times
    assert extras["n_samp"] != extras["n_samp_tot"]

    # Test that LPA, nasion and RPA are correct.
    coord_frames = np.array([d["coord_frame"] for d in raw.info["dig"]])
    assert np.all(coord_frames == FIFF.FIFFV_COORD_HEAD)
    cardinals = {d["ident"]: d["r"] for d in raw.info["dig"]}
    assert cardinals[1][0] < cardinals[2][0] < cardinals[3][0]  # x coord
    assert cardinals[1][1] < cardinals[2][1]  # y coord
    assert cardinals[3][1] < cardinals[2][1]  # y coord
    for key in cardinals.keys():
        assert_allclose(cardinals[key][2], 0, atol=1e-6)  # z coord


@testing.requires_testing_data
@pytest.mark.parametrize("comp_grade", [0, 1])
def test_saving_picked(tmp_path, comp_grade):
    """Test saving picked CTF instances."""
    temp_dir = str(tmp_path)
    out_fname = op.join(temp_dir, "test_py_raw.fif")
    raw = read_raw_ctf(op.join(ctf_dir, ctf_fname_1_trial))
    assert raw.info["meas_date"] == _stamp_to_dt((1367228160, 0))
    raw.crop(0, 1).load_data()
    assert raw.compensation_grade == get_current_comp(raw.info) == 0
    assert len(raw.info["comps"]) == 5
    picks = _picks_to_idx(raw.info, "meg", with_ref_meg=False)

    raw.apply_gradient_compensation(comp_grade)
    with catch_logging() as log:
        raw_pick = raw.copy().pick(picks, verbose=True)
    assert len(raw.info["comps"]) == 5
    assert len(raw_pick.info["comps"]) == 0
    log = log.getvalue()
    assert "Removing 5 compensators" in log
    raw_pick.save(out_fname, overwrite=True)  # should work
    raw2 = read_raw_fif(out_fname)
    assert raw_pick.ch_names == raw2.ch_names
    assert_array_equal(raw_pick.times, raw2.times)
    assert_allclose(
        raw2[0:20][0], raw_pick[0:20][0], rtol=1e-6, atol=1e-20
    )  # atol is very small but > 0

    raw2 = read_raw_fif(out_fname, preload=True)
    assert raw_pick.ch_names == raw2.ch_names
    assert_array_equal(raw_pick.times, raw2.times)
    assert_allclose(
        raw2[0:20][0], raw_pick[0:20][0], rtol=1e-6, atol=1e-20
    )  # atol is very small but > 0


@brainstorm.bst_raw.requires_bstraw_data
def test_read_ctf_annotations():
    """Test reading CTF marker file."""
    EXPECTED_LATENCIES = (
        np.array(
            [
                5640,
                7950,
                9990,
                12253,
                14171,
                16557,
                18896,
                20846,  # noqa
                22702,
                24990,
                26830,
                28974,
                30906,
                33077,
                34985,
                36907,  # noqa
                38922,
                40760,
                42881,
                45222,
                47457,
                49618,
                51802,
                54227,  # noqa
                56171,
                58274,
                60394,
                62375,
                64444,
                66767,
                68827,
                71109,  # noqa
                73499,
                75807,
                78146,
                80415,
                82554,
                84508,
                86403,
                88426,  # noqa
                90746,
                92893,
                94779,
                96822,
                98996,
                99001,
                100949,
                103325,  # noqa
                105322,
                107678,
                109667,
                111844,
                113682,
                115817,
                117691,
                119663,  # noqa
                121966,
                123831,
                126110,
                128490,
                130521,
                132808,
                135204,
                137210,  # noqa
                139130,
                141390,
                143660,
                145748,
                147889,
                150205,
                152528,
                154646,  # noqa
                156897,
                159191,
                161446,
                163722,
                166077,
                168467,
                170624,
                172519,  # noqa
                174719,
                176886,
                179062,
                181405,
                183709,
                186034,
                188454,
                190330,  # noqa
                192660,
                194682,
                196834,
                199161,
                201035,
                203008,
                204999,
                207409,  # noqa
                209661,
                211895,
                213957,
                216005,
                218040,
                220178,
                222137,
                224305,  # noqa
                226297,
                228654,
                230755,
                232909,
                235205,
                237373,
                239723,
                241762,  # noqa
                243748,
                245762,
                247801,
                250055,
                251886,
                254252,
                256441,
                258354,  # noqa
                260680,
                263026,
                265048,
                267073,
                269235,
                271556,
                273927,
                276197,  # noqa
                278436,
                280536,
                282691,
                284933,
                287061,
                288936,
                290941,
                293183,  # noqa
                295369,
                297729,
                299626,
                301546,
                303449,
                305548,
                307882,
                310124,  # noqa
                312374,
                314509,
                316815,
                318789,
                320981,
                322879,
                324878,
                326959,  # noqa
                329341,
                331200,
                331201,
                333469,
                335584,
                337984,
                340143,
                342034,  # noqa
                344360,
                346309,
                348544,
                350970,
                353052,
                355227,
                357449,
                359603,  # noqa
                361725,
                363676,
                365735,
                367799,
                369777,
                371904,
                373856,
                376204,  # noqa
                378391,
                380800,
                382859,
                385161,
                387093,
                389434,
                391624,
                393785,  # noqa
                396093,
                398214,
                400198,
                402166,
                404104,
                406047,
                408372,
                410686,  # noqa
                413029,
                414975,
                416850,
                418797,
                420824,
                422959,
                425026,
                427215,  # noqa
                429278,
                431668,  # noqa
            ]
        )
        - 1
    )  # Fieldtrip has 1 sample difference with MNE

    raw = RawArray(
        data=np.empty((1, 432000), dtype=np.float64),
        info=create_info(ch_names=1, sfreq=1200.0),
    )
    raw.set_meas_date(read_raw_ctf(somato_fname).info["meas_date"])
    raw.set_annotations(read_annotations(somato_fname))

    events, _ = events_from_annotations(raw)
    latencies = np.sort(events[:, 0])
    assert_allclose(latencies, EXPECTED_LATENCIES, atol=1e-6)


@testing.requires_testing_data
def test_read_ctf_annotations_smoke_test():
    """Test reading CTF marker file.

    `testdata_ctf_mc.ds` has no trials or offsets therefore its a plain reading
    of whatever is in the MarkerFile.mrk.
    """
    EXPECTED_ONSET = [
        0.0,
        0.1425,
        0.285,
        0.42833333,
        0.57083333,
        0.71416667,
        0.85666667,
        0.99916667,
        1.1425,
        1.285,
        1.4275,
        1.57083333,
        1.71333333,
        1.85666667,
        1.99916667,
        2.14166667,
        2.285,
        2.4275,
        2.57083333,
        2.71333333,
        2.85583333,
        2.99916667,
        3.14166667,
        3.28416667,
        3.4275,
        3.57,
        3.71333333,
        3.85583333,
        3.99833333,
        4.14166667,
        4.28416667,
        4.42666667,
        4.57,
        4.7125,
        4.85583333,
        4.99833333,
    ]
    fname = op.join(ctf_dir, "testdata_ctf_mc.ds")
    annot = read_annotations(fname)
    assert_allclose(annot.onset, EXPECTED_ONSET)

    raw = read_raw_ctf(fname)
    _assert_annotations_equal(raw.annotations, annot, 1e-6)


def _read_res4_mag_comp(dsdir):
    res = mne.io.ctf.res4._read_res4(dsdir)
    for ch in res["chs"]:
        if ch["sensor_type_index"] == CTF.CTFV_REF_MAG_CH:
            ch["grad_order_no"] = 1
    return res


def _bad_res4_grad_comp(dsdir):
    res = mne.io.ctf.res4._read_res4(dsdir)
    for ch in res["chs"]:
        if ch["sensor_type_index"] == CTF.CTFV_MEG_CH:
            ch["grad_order_no"] = 1
            break
    return res


@testing.requires_testing_data
def test_missing_res4(tmp_path):
    """Test that res4 missing is handled gracefully."""
    use_ds = tmp_path / ctf_fname_continuous
    shutil.copytree(ctf_dir / ctf_fname_continuous, tmp_path / ctf_fname_continuous)
    read_raw_ctf(use_ds)
    os.remove(use_ds / (ctf_fname_continuous[:-2] + "meg4"))
    with pytest.raises(OSError, match="could not find the following"):
        read_raw_ctf(use_ds)


@testing.requires_testing_data
def test_read_ctf_mag_bad_comp(tmp_path, monkeypatch):
    """Test CTF reader with mag comps and bad comps."""
    path = op.join(ctf_dir, ctf_fname_continuous)
    raw_orig = read_raw_ctf(path)
    assert raw_orig.compensation_grade == 0
    monkeypatch.setattr(mne.io.ctf.ctf, "_read_res4", _read_res4_mag_comp)
    raw_mag_comp = read_raw_ctf(path)
    assert raw_mag_comp.compensation_grade == 0
    sphere = mne.make_sphere_model()
    src = mne.setup_volume_source_space(pos=50.0, exclude=5.0, bem=sphere)
    assert src[0]["nuse"] == 26
    for grade in (0, 1):
        raw_orig.apply_gradient_compensation(grade)
        raw_mag_comp.apply_gradient_compensation(grade)
        args = (None, src, sphere, True, False)
        fwd_orig = make_forward_solution(raw_orig.info, *args)
        fwd_mag_comp = make_forward_solution(raw_mag_comp.info, *args)
        assert_allclose(fwd_orig["sol"]["data"], fwd_mag_comp["sol"]["data"])
    monkeypatch.setattr(mne.io.ctf.ctf, "_read_res4", _bad_res4_grad_comp)
    with pytest.raises(RuntimeError, match="inconsistent compensation grade"):
        read_raw_ctf(path)


@testing.requires_testing_data
def test_invalid_meas_date(monkeypatch):
    """Test handling of invalid meas_date."""

    def _convert_time_bad(date_str, time_str):
        return _convert_time("", "")

    monkeypatch.setattr(mne.io.ctf.info, "_convert_time", _convert_time_bad)

    with catch_logging() as log:
        raw = read_raw_ctf(ctf_dir / ctf_fname_continuous, verbose=True)
    log = log.getvalue()
    assert "No date or time found" in log
    assert raw.info["meas_date"] == datetime.fromtimestamp(0, tz=timezone.utc)
