#!/usr/bin/env python

import numpy as np
import matplotlib
import matplotlib.cm as cm
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt
import sys
import fnmatch
import os
from matplotlib.widgets import RadioButtons,Button

im=None
cnt=None
centre_marker=None

def next_click(w):
    global crystal
    crystal += 20
    print("Crystal %i" % crystal)
    update_graph()


def prev_click(w):
    global crystal
    crystal -= 20
    print("Crystal %i" % crystal)
    update_graph()


def iteration_click(label):
    global cycle
    cycle = label.split(" ")[1].split("\n")[0]
    update_graph()


def variable_click(label):
    global varpair
    varpair = label
    update_graph()


def update_graph():

    global im, cnt, centre_marker

    filename="%s/grid-crystal%i-cycle%s-%s.dat" % (folder,crystal,cycle,varpair)

    with open(filename, "r") as f:

        l = f.readline().split(None,3)

        min1 = float(l[0])
        max1 = float(l[1])
        cur1 = float(l[2])
        label1 = l[3]

        l = f.readline().split(None,3)
        min2 = float(l[0])
        max2 = float(l[1])
        cur2 = float(l[2])
        label2 = l[3]

    extent = (min1, max1, min2, max2)
    Z = np.loadtxt(fname=filename, ndmin=2, delimiter=" ", skiprows=2)

    ax.set_xlim([min1,max1])
    ax.set_ylim([min2,max2])

    if not im:
        im = ax.imshow(Z, interpolation='none', origin='lower',
                        cmap=cm.gray, extent=extent, aspect='auto')
        im.autoscale()
    else:
        im.set_data(Z)
        im.set_extent(extent)
        im.autoscale()

    levels = np.arange(0.0, 1.6, 0.1)

    if cnt:
        for coll in cnt.collections:
            coll.remove()

    cnt = ax.contour(Z, levels, origin='lower', linewidths=1, alpha=1, extent=extent, cmap=plt.cm.Greens)

    ax.set_title(filename)
    ax.set_xlabel(label1)
    ax.set_ylabel(label2)
    plt.flag()

    if centre_marker:
        centre_marker.remove()
    centre_marker, = plt.plot(cur1, cur2, 'bH', color='r')

    fig.canvas.draw()

fig = plt.figure(figsize=(10,5))
fig.subplots_adjust(left=0.05, bottom=0.05, right=0.70, top=0.95)

if len(sys.argv) == 2:
    folder = sys.argv[1]
else:
    folder = "pr-logs"

print("Using folder '%s'" % folder)

# Find out what there is to plot
crystals = []
cycles = []
varpairs = []
for file in os.listdir(folder):
    if not fnmatch.fnmatch(file, "grid-*.dat"):
        continue
    sp = file.rstrip(".dat").split("-")
    crystals.append(int(sp[1].lstrip("crystal")))
    cycles.append(sp[2].lstrip("cycle"))
    varpairs.append(sp[3]+"-"+sp[4])

crystals = sorted(set(crystals))
cycles = sorted(set(cycles))
varpairs = sorted(set(varpairs))

crystal = crystals[0]
cycle = cycles[0]
varpair = varpairs[0]

# Iteration selector
ax = plt.axes([0.75, 0.55, 0.2, 0.40], facecolor="lightgoldenrodyellow")
iterations = ["Iteration "+str(f) for f in cycles]
if iterations[0] != "Iteration 0":
    print("Whoops, couldn't find iteration 0!")
    sys.exit(1)
iterations[0] = "Iteration 0\n(initial scaling only)"
if iterations[len(iterations)-1] != "Iteration F":
    print("Whoops, couldn't find final iteration!")
else:
    iterations[len(iterations)-1] = "Iteration F\n(after final merge)"
iteration = RadioButtons(ax, iterations)
iteration.on_clicked(iteration_click)

# Variable selector
ax = plt.axes([0.75, 0.20, 0.2, 0.30], facecolor="lightgoldenrodyellow")
variable = RadioButtons(ax, varpairs)
variable.on_clicked(variable_click)

# Crystal selector
ax = plt.axes([0.75, 0.08, 0.20, 0.06])
crystal_prev = Button(ax, "Previous crystal")
crystal_prev.on_clicked(prev_click)
ax = plt.axes([0.75, 0.01, 0.20, 0.06])
crystal_next = Button(ax, "Next crystal")
crystal_next.on_clicked(next_click)

ax = plt.axes([0.1, 0.1, 0.6, 0.8])
update_graph()
plt.colorbar(im, shrink=0.8)

plt.show()