#!/usr/bin/python
# -*- coding:utf-8 -*-
"""
Implementation of the plotting and visualization functions.
"""
import numpy as np
import time
import matplotlib.pyplot as plt

class DynamicUpdate():
    #Suppose we know the x range
    min_x = -10
    max_x = 10

    plt.ion()

    def __init__(self, dyn_syst):
        self.dyn_syst = dyn_syst

    def set_lims(self, factor=1.5):
        self.ax.set_xlim(factor*self.min_x, factor*self.max_x)
        self.ax.set_ylim(factor*self.min_x, factor*self.max_x)
        self.ax.set_zlim(factor*self.min_x, factor*self.max_x)

    def on_launch(self):
        #Set up plot
        self.fig = plt.figure(figsize=(10,10), facecolor='k')
        self.ax = self.fig.add_subplot(projection='3d')
        self.ax.set_facecolor('k')
        self.ax.xaxis.label.set_color('w')
        self.ax.yaxis.label.set_color('w')
        self.ax.zaxis.label.set_color('w')
        self.ax.tick_params(axis='x',colors='w')
        self.ax.tick_params(axis='y',colors='w')
        self.ax.tick_params(axis='z',colors='w')
        self.ax.w_xaxis.line.set_color('w')
        self.ax.w_yaxis.line.set_color('w')
        self.ax.w_zaxis.line.set_color('w')
        self.ax.w_xaxis.set_pane_color((0,0,0,0))
        self.ax.w_yaxis.set_pane_color((0,0,0,0))
        self.ax.w_zaxis.set_pane_color((0,0,0,0))
        self.lines = []
        for i,body in enumerate(self.dyn_syst.bodylist):
            x, y, z = body.q
            lines, = self.ax.plot([x],[y],[z],'o',color="C{0:d}".format(i),label="{0:s}".format(str(body)))
            self.lines.append(lines)
        self.lines = np.array(self.lines)
        #Autoscale on unknown axis and known lims on the other
        self.ax.set_autoscaley_on(True)
        self.set_lims()
        #Other stuff
        self.ax.grid()
        self.ax.legend(labelcolor='w', frameon=True, framealpha=0.2)

    def on_running(self, dyn_syst, step=None, label=None):
        xdata, ydata, zdata = dyn_syst.get_positions()
        values = np.sqrt(np.sum((np.array((xdata,ydata,zdata))**2).T,axis=1))
        self.min_x, self.max_x = -np.max([np.abs(values).max(),self.max_x]), np.max([np.abs(values).max(),self.max_x])
        self.set_lims()
        #Update data (with the new _and_ the old points)
        for i,body in enumerate(dyn_syst.bodylist):
            x, y, z = body.q
            self.lines[i].set_data_3d([x], [y], [z])
        if not label is None:
            self.ax.set_title(label,color='w')
        #Need both of these in order to rescale
        self.ax.relim()
        self.ax.autoscale_view()
        #We need to draw *and* flush
        self.fig.canvas.draw()
        self.fig.canvas.flush_events()
        if not step is None and step%1000==0:
            self.fig.savefig("tmp/{0:06d}.png".format(step),bbox_inches="tight")

    #Example
    def __call__(self):
        import numpy as np
        import time
        self.on_launch()
        xdata = []
        ydata = []
        for x in np.arange(0,10,0.5):
            xdata.append(x)
            ydata.append(np.exp(-x**2)+10*np.exp(-(x-7)**2))
            self.on_running(xdata, ydata)
            time.sleep(1)
        return xdata, ydata