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

import numpy as np
import pytest

from mne import compute_proj_evoked, pick_types, read_evokeds
from mne.datasets import testing
from mne.viz import plot_projs_joint

data_dir = testing.data_path(download=False)
sample_dir = data_dir / "MEG" / "sample"
evoked_fname = sample_dir / "sample_audvis-ave.fif"


@testing.requires_testing_data
def test_plot_projs_joint():
    """Test plot_projs_joint."""
    evoked = read_evokeds(evoked_fname)[0].apply_baseline((None, 0))
    evoked.info["bads"] = []
    n_mag, n_grad, n_eeg = 9, 10, 11
    n_mag_proj, n_grad_proj, n_eeg_proj = 2, 2, 1
    # We pick in this weird order to ensure our plotting order follows it
    picks = np.concatenate(
        [
            pick_types(evoked.info, meg="grad")[:n_grad],
            pick_types(evoked.info, meg=False, eeg=True)[:n_eeg],
            pick_types(evoked.info, meg="mag")[:n_mag],
        ]
    )
    evoked.pick(picks)
    assert len(evoked.ch_names) == n_mag + n_grad + n_eeg
    assert evoked.get_channel_types(unique=True) == ["grad", "eeg", "mag"]
    projs = compute_proj_evoked(
        evoked, n_mag=n_mag_proj, n_grad=n_grad_proj, n_eeg=n_eeg_proj
    )
    assert len(projs) == 5
    with pytest.warns(RuntimeWarning, match="aliasing"):
        evoked.crop(-0.1, 0.1).decimate(10)
    topomap_kwargs = dict(res=8, contours=0, sensors=False)
    fig = plot_projs_joint(
        projs, evoked, topomap_kwargs=topomap_kwargs, verbose="error"
    )
    ylab = fig.axes[0].get_ylabel()
    assert ylab.startswith("Grad"), ylab
    ylab = fig.axes[4].get_ylabel()
    assert ylab.startswith("EEG"), ylab
    ylab = fig.axes[7].get_ylabel()
    assert ylab.startswith("Mag"), ylab
    mag_trace_ax_idx = 10
    mag_trace_ax = fig.axes[mag_trace_ax_idx]
    assert mag_trace_ax.get_ylabel() == ""
    assert len(mag_trace_ax.lines) == n_mag + 2 * n_mag_proj
    old_len = len(mag_trace_ax.lines)
    assert len(fig.axes) == 11  # 3x4
    fig = plot_projs_joint(
        projs,
        evoked,
        picks_trace="MEG 0111",
        topomap_kwargs=topomap_kwargs,
        verbose="error",
    )
    assert len(fig.axes[mag_trace_ax_idx].lines) == old_len + 1