import numpy as np

import matplotlib.pyplot as plt
from matplotlib.patches import Circle, RegularPolygon
from matplotlib.path import Path
from matplotlib.projections.polar import PolarAxes
from matplotlib.projections import register_projection
from matplotlib.spines import Spine
from matplotlib.transforms import Affine2D


def radar_factory(varso, frame='circle'):

    # calculate evenly-spaced axis angles
    theta = np.linspace(0, np.pi*2, varso, endpoint=False)

    class AxesR(PolarAxes):

        name = 'radar'
        # use 1 line segment to connect specified points
        RESOLUTION = 1

        def __init__(self, *args, **kwargs):
            super().__init__(*args, **kwargs)
            self.set_theta_zero_location('N')

        def fill(self, *args, closed=True, **kwargs):
            return super().fill(closed=closed, *args, **kwargs)

        def plot(self, *args, **kwargs):
            lines = super().plot(*args, **kwargs)
            for line in lines:
                self._close_line(line)

        def _close_line(self, line):
            x, y = line.get_data()
            # FIXME: markers at x[0], y[0] get doubled-up
            if x[0] != x[-1]:
                x = np.append(x, x[0])
                y = np.append(y, y[0])
                line.set_data(x, y)

        def set_varlabels(self, labels):
            self.set_thetagrids(np.degrees(theta), labels)

        def _gen_axes_patch(self):
            if frame == 'circle':
                return Circle((0.5, 0.5), 0.5)
            elif frame == 'polygon':
                return RegularPolygon((0.5, 0.5), varso,
                                      radius=.5, edgecolor="k")
            else:
                raise ValueError("Unknown value for 'frame': %s" % frame)

        def _gen_axes_spines(self):
            if frame == 'circle':
                return super()._gen_axes_spines()
            elif frame == 'polygon':
                # spine_type must be 'left'/'right'/'top'/'bottom'/'circle'.
                spine = Spine(axes=self,
                              spine_type='circle',
                              path=Path.unit_regular_polygon(varso))
                # unit_regular_polygon gives a polygon of radius 1 centered at
                # (0, 0) but we want a polygon of radius 0.5 centered at (0.5,
                # 0.5) in axes coordinates.
                spine.set_transform(Affine2D().scale(.5).translate(.5, .5)
                                    + self.transAxes)
                return {'polar': spine}
            else:
                raise ValueError("Unknown value for 'frame': %s" % frame)

    register_projection(AxesR)
    return theta


def_Radar_plot(j):
    N = 6
    theta = radar_factory(N, frame='polygon')

    data = j
    spoke_labels = data.pop(0)

    fig, axs = plt.subplots(figsize=(15, 15), nrows=2, ncols=3,
                            subplot_kw=dict(projection='radar'))
    fig.subplots_adjust(wspace=0.55, hspace=-0.60, top=1.1, bottom=0.05)

    colors = ['b', 'r', 'g']
    # Plot the four cases from the example data on separate axes
    for ax, (title, case_data) in zip(axs.flat, data):
        ax.set_rgrids([0.2, 0.4, 0.6, 0.8])
        ax.set_title(title, weight='bold', size='medium', position=(0.5, 1.1),
                     horizontalalignment='center', verticalalignment='center')
        for d, color in zip(case_data, colors):
            ax.plot(theta, d, color=color)
            ax.fill(theta, d, facecolor=color, alpha=0.25)
        ax.set_varlabels(spoke_labels)

    # add legend relative to top-left plot
    labels = ('Factor 1', 'Factor 2', 'Factor 3', 'Factor 4', 'Factor 5')
    #legend = axs[0, 0].legend(labels, loc=(0.9, .95),
     #                         labelspacing=0.1, fontsize='small')

    fig.text(0.5, 0.885, 'Base Stats comparison along all 18 types',
             horizontalalignment='center', color='black', weight='bold',
             size='25')

    plt.show()