#!/usr/bin/env python
# vim: set fileencoding=utf-8 :

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import itertools

# Make sure we won't require an X11 connection
import matplotlib
import numpy
import six

matplotlib.use("Agg")  # noqa need to happen before further imports
from matplotlib import pyplot as pyplot  # noqa
from matplotlib.figure import Figure  # noqa


class Plotter:
    def setup(self, parameters):

        self.xlabel = parameters["xlabel"]
        self.xaxis_multiplier = parameters["xaxis_multiplier"]
        self.xaxis_log = parameters["xaxis_log"]
        self.ylabel = parameters["ylabel"]
        self.yaxis_multiplier = parameters["yaxis_multiplier"]
        self.yaxis_log = parameters["yaxis_log"]
        self.title = parameters["title"]
        self.line_attributes = parameters["line_attributes"]
        self.legend = parameters["legend"]
        self.grid = parameters["grid"]
        self.mimetype = parameters["mimetype"]

        return True

    def process(self, inputs):

        # Creates the image to return
        fig = Figure()
        ax = fig.add_subplot(111)

        if not isinstance(inputs, (list, tuple)):
            inputs = [inputs]

        self.legend = self.legend.split("&")
        if isinstance(self.legend, str):
            self.legend = [self.legend]

        self.line_attributes = self.line_attributes.split("&")
        if isinstance(self.line_attributes, str):
            self.line_attributes = [self.line_attributes]

        try:
            Z = itertools.izip
        except AttributeError:
            Z = zip

        C = itertools.cycle

        for input, attributes, label in Z(
            inputs, C(self.line_attributes), C(self.legend)
        ):

            # Massages the input data
            final_data = numpy.array([(k.x, k.y) for k in input.data])
            x = final_data[:, 0]
            y = final_data[:, 1]
            x *= self.xaxis_multiplier
            y *= self.yaxis_multiplier

            args = (x, y)
            if attributes:
                args = args + (attributes,)
            kwargs = {}
            if label:
                kwargs["label"] = label

            # Plots
            ax.plot(*args, **kwargs)

        # Sets plot attributes
        ax.set_xlabel(self.xlabel)
        ax.set_ylabel(self.ylabel)
        ax.set_title(self.title)
        ax.grid(self.grid)
        if self.xaxis_log:
            ax.set_xscale("log")
        if self.yaxis_log:
            ax.set_yscale("log")
        if any(self.legend):
            ax.legend()

        # Returns the image
        if six.PY2:
            sio = six.StringIO()
        else:
            sio = six.BytesIO()

        if self.mimetype == "image/png":
            pyplot.savefig(sio, format="png")
        elif self.mimetype == "image/jpeg":
            pyplot.savefig(sio, format="jpeg")
        elif self.mimetype == "application/pdf":
            from matplotlib.backends.backend_pdf import FigureCanvasPdf

            canvas = FigureCanvasPdf(fig)
            canvas.print_figure(sio)

        return sio.getvalue()
