import matplotlib.pyplot as plt
import matplotlib.animation as ani
from random import shuffle

COLOR_PINK = '#ffc0cb'
COLOR_GOSSIP = '#cbffc0'


def draw_bar(li, color=COLOR_PINK):
  x_axis = list(range(1, len(li) + 1))

  plt.bar(x_axis, li,
          tick_label=li, align='center', width=0.4, color=color)


def draw_frame(frame, sorted_li, steps):
  plt.clf()
  li = steps[frame]
  options = {'color': COLOR_GOSSIP} if li == sorted_li else {}
  draw_bar(steps[frame], **options)


def bubble_sort(li):
  sorted_li = list(li)
  steps = []

  for i in range(0, len(sorted_li)):
    for j in range(1, len(sorted_li) - i):
      if sorted_li[j - 1] > sorted_li[j]:
        sorted_li[j], sorted_li[j - 1] = sorted_li[j - 1], sorted_li[j]

      if len(steps) == 0 or steps[-1] != sorted_li:
        steps.append(list(sorted_li))

  return sorted_li, steps


if __name__ == '__main__':
  li = list(range(1, 11))
  shuffle(li)

  sorted_li, steps = bubble_sort(li)

  fig = plt.figure(figsize=(6.0, 6.0))

  #Make the sort result appear longer by 5 frames in the animation.
  # FuncAnimation()To repeat_There is a delay option, but this doesn't work.
  steps = steps + [steps[-1]] * 5

  anim = ani.FuncAnimation(fig, draw_frame,
                           fargs=(sorted_li, steps), frames=len(steps))
  anim.save('bubble_sort.gif', writer='imagemagick', fps=5)

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