import matplotlib.figure
import numpy as np
import pytest

from he11lib.data import MeasurementPlane, ReconstructionResult
from he11lib.plotting import plot_center_trace, plot_mode_purity, plot_residuals


def make_result(**overrides):
    defaults = dict(
        purity={(0, 0): (0.9, 0.1), (1, 0): (0.1, -0.2)},
        reconstructed_field=np.zeros((5, 5), dtype=complex),
        centers=[(0.0, 0.0), (1e-4, -1e-4), (2e-4, -2e-4)],
        pointing_angle_deg=0.5,
        residuals=[np.ones((5, 5)), np.ones((5, 5)) * 2, np.ones((5, 5)) * 3],
    )
    defaults.update(overrides)
    return ReconstructionResult(**defaults)


def make_planes():
    return [
        MeasurementPlane(flux=np.zeros((5, 5)), z=0.3),
        MeasurementPlane(flux=np.zeros((5, 5)), z=0.5),
        MeasurementPlane(flux=np.zeros((5, 5)), z=0.7),
    ]


def test_plot_mode_purity_draws_one_bar_per_mode():
    result = make_result()
    fig = plot_mode_purity(result)

    assert isinstance(fig, matplotlib.figure.Figure)
    ax = fig.axes[0]
    assert len(ax.patches) == len(result.purity)


def test_plot_center_trace_plots_one_point_per_plane():
    planes = make_planes()
    result = make_result()
    fig = plot_center_trace(planes, result)

    assert isinstance(fig, matplotlib.figure.Figure)
    ax = fig.axes[0]
    line = ax.lines[0]
    assert len(line.get_xdata()) == len(planes)


def test_plot_residuals_draws_one_axes_per_plane():
    planes = make_planes()
    result = make_result()
    fig = plot_residuals(planes, result)

    assert isinstance(fig, matplotlib.figure.Figure)
    image_axes = [ax for ax in fig.axes if ax.images]
    assert len(image_axes) == len(planes)


def test_plot_residuals_raises_when_phase_retrieval_used_without_residuals():
    planes = make_planes()
    result = make_result(residuals=[], used_phase_retrieval=True)

    with pytest.raises(ValueError, match="residuals"):
        plot_residuals(planes, result)