import numpy as np
import matplotlib.pyplot as plt
from matplotlib import markers
from matplotlib.path import Path
from matplotlib.testing.decorators import check_figures_equal

import pytest


def test_markers_valid():
    marker_style = markers.MarkerStyle()
    mrk_array = np.array([[-0.5, 0],
                          [0.5, 0]])
    # Checking this doesn't fail.
    marker_style.set_marker(mrk_array)


def test_markers_invalid():
    marker_style = markers.MarkerStyle()
    mrk_array = np.array([[-0.5, 0, 1, 2, 3]])
    # Checking this does fail.
    with pytest.raises(ValueError):
        marker_style.set_marker(mrk_array)


def test_marker_path():
    marker_style = markers.MarkerStyle()
    path = Path([[0, 0], [1, 0]], [Path.MOVETO, Path.LINETO])
    # Checking this doesn't fail.
    marker_style.set_marker(path)


class UnsnappedMarkerStyle(markers.MarkerStyle):
    """
    A MarkerStyle where the snap threshold is force-disabled.

    This is used to compare to polygon/star/asterisk markers which do not have
    any snap threshold set.
    """
    def _recache(self):
        super()._recache()
        self._snap_threshold = None


@check_figures_equal()
def test_poly_marker(fig_test, fig_ref):
    ax_test = fig_test.add_subplot()
    ax_ref = fig_ref.add_subplot()

    # Note, some reference sizes must be different because they have unit
    # *length*, while polygon markers are inscribed in a circle of unit
    # *radius*. This introduces a factor of np.sqrt(2), but since size is
    # squared, that becomes 2.
    size = 20**2

    # Squares
    ax_test.scatter([0], [0], marker=(4, 0, 45), s=size)
    ax_ref.scatter([0], [0], marker='s', s=size/2)

    # Diamonds, with and without rotation argument
    ax_test.scatter([1], [1], marker=(4, 0), s=size)
    ax_ref.scatter([1], [1], marker=UnsnappedMarkerStyle('D'), s=size/2)
    ax_test.scatter([1], [1.5], marker=(4, 0, 0), s=size)
    ax_ref.scatter([1], [1.5], marker=UnsnappedMarkerStyle('D'), s=size/2)

    # Pentagon, with and without rotation argument
    ax_test.scatter([2], [2], marker=(5, 0), s=size)
    ax_ref.scatter([2], [2], marker=UnsnappedMarkerStyle('p'), s=size)
    ax_test.scatter([2], [2.5], marker=(5, 0, 0), s=size)
    ax_ref.scatter([2], [2.5], marker=UnsnappedMarkerStyle('p'), s=size)

    # Hexagon, with and without rotation argument
    ax_test.scatter([3], [3], marker=(6, 0), s=size)
    ax_ref.scatter([3], [3], marker='h', s=size)
    ax_test.scatter([3], [3.5], marker=(6, 0, 0), s=size)
    ax_ref.scatter([3], [3.5], marker='h', s=size)

    # Rotated hexagon
    ax_test.scatter([4], [4], marker=(6, 0, 30), s=size)
    ax_ref.scatter([4], [4], marker='H', s=size)

    # Octagons
    ax_test.scatter([5], [5], marker=(8, 0, 22.5), s=size)
    ax_ref.scatter([5], [5], marker=UnsnappedMarkerStyle('8'), s=size)

    ax_test.set(xlim=(-0.5, 5.5), ylim=(-0.5, 5.5))
    ax_ref.set(xlim=(-0.5, 5.5), ylim=(-0.5, 5.5))


def test_star_marker():
    # We don't really have a strict equivalent to this marker, so we'll just do
    # a smoke test.
    size = 20**2

    fig, ax = plt.subplots()
    ax.scatter([0], [0], marker=(5, 1), s=size)
    ax.scatter([1], [1], marker=(5, 1, 0), s=size)
    ax.set(xlim=(-0.5, 0.5), ylim=(-0.5, 1.5))


# The asterisk marker is really a star with 0-size inner circle, so the ends
# are corners and get a slight bevel. The reference markers are just singular
# lines without corners, so they have no bevel, and we need to add a slight
# tolerance.
@check_figures_equal(tol=1.45)
def test_asterisk_marker(fig_test, fig_ref, request):
    ax_test = fig_test.add_subplot()
    ax_ref = fig_ref.add_subplot()

    # Note, some reference sizes must be different because they have unit
    # *length*, while asterisk markers are inscribed in a circle of unit
    # *radius*. This introduces a factor of np.sqrt(2), but since size is
    # squared, that becomes 2.
    size = 20**2

    def draw_ref_marker(y, style, size):
        # As noted above, every line is doubled. Due to antialiasing, these
        # doubled lines make a slight difference in the .png results.
        ax_ref.scatter([y], [y], marker=UnsnappedMarkerStyle(style), s=size)
        if request.getfixturevalue('ext') == 'png':
            ax_ref.scatter([y], [y], marker=UnsnappedMarkerStyle(style),
                           s=size)

    # Plus
    ax_test.scatter([0], [0], marker=(4, 2), s=size)
    draw_ref_marker(0, '+', size)
    ax_test.scatter([0.5], [0.5], marker=(4, 2, 0), s=size)
    draw_ref_marker(0.5, '+', size)

    # Cross
    ax_test.scatter([1], [1], marker=(4, 2, 45), s=size)
    draw_ref_marker(1, 'x', size/2)

    ax_test.set(xlim=(-0.5, 1.5), ylim=(-0.5, 1.5))
    ax_ref.set(xlim=(-0.5, 1.5), ylim=(-0.5, 1.5))