import os
import matplotlib.pyplot as plt
import numpy as np
import random as rnd
from time import time



def show_card (ax,s=100,v=1,delay=1.2):
	suit = suit_names[s//100 -1]
	fname = dir+str(v)+'-'+suit+'.jpg'
	im = plt.imread(fname)
	img = ax.imshow(im)
	plt.axis('off')
	plt.draw()
	plt.pause(delay) 
	plt.ion()
	plt.show()	 


def show_all_cards ():
#	shows all cards in jpgs subdirectory
	for fname in os.listdir(dir):
		fname = os.path.join(dir, fname)
		im = plt.imread(fname)
		img = ax.imshow(im)
		plt.axis('off')
		plt.draw()
		plt.pause(0.001) 


def shuffle_deck (ax, deck, n_times=2):
# create and shuffle n_times a deck of cards
# start is the staring number for playing the sequence
# if start < 0 then enter explanation mode and show only 
# the key cards.

# create ordered deck
	n = 0
	deck = np.empty(52,dtype=np.int32)   # 0..51
	for s in range(4):	
		for i in range(1,14):
			code = (s+1)*100 +i	# card code = {100..400} + number
			deck[n] = code		# array of short int
			n = n + 1
# shuffle n_times the length of deck
	#print(' input int randomizer')
	#seed = input()
	#rnd.seed = seed
	for iter in range(n_times*len(deck)):
		r1 = rnd.randrange(0,len(deck))
		r2 = rnd.randrange(0,len(deck))  
		tmp = deck [r1] 		# swap r1 <-> r2 cards
		deck[r1] = deck[r2]
		deck[r2] = tmp
	return(deck)



def display_and_play (ax, deck, start = 9):
# print the deck  
#	for k in deck: print(k, k//100, k%100)
#	if start < 0 then count starts with |start|
#   and only key cards are drawn
	i = 0
	key = abs(start) 			# the starting card = 1st key
	for card in deck:
		i = i + 1				# number of card in the deck
		v = card%100			# decipher card value
		if (start < 0): 		# show blanks unless a key
			name = 'blank'
		if (start > 0 or i == key):   	# show all cards' jpg's
			s = card//100 -1	# index, suit unimportant exc. in plots	
			name = str(v)+'-'+suit_names[s]

		# if i-th card is a key card, update the key (target) 
		if (i == key): 
			last_key = key
			last_key_card = name
			if (v <= 10): 
				key = key + v
			else: 
				key = key + 4

		# 6 lines, 10 panels in each
		ax = fig.add_subplot(6, 10, i)
		plt.axis('off')
		im = plt.imread(dir+name+'.jpg')
		img = ax.imshow(im)
#		plt.draw()
		#plt.pause(0.001) 
	plt.axis('off')
	plt.show()	 
	#print('end of show_all_'); iff = ''; input(iff)
	plt.pause(2.)
	return(ax, last_key, last_key_card)



#__________________________________________________________________
#
# main program
#
# creates and shows a shuffled deck of cards
# suites: 100 = spades, 200 = hearts, 300 = diamonds, 400 = clubs
# card numbers: 1 = A, 2...10, 11=J, 12=Q, 13=K.
#__________________________________________________________________

# prepare graphics window and define constants
dir = 'jpgs/'	
suit_names = ('spades','hearts','diamonds','clubs')
deck = ax = 0

# create and shuffle a deck of 52 cards
deck = shuffle_deck (ax, deck, 4)

# prepare the plot area without axes
fig = plt.figure(figsize=(8,7.5))
fig.subplots_adjust (hspace=0.1, wspace=0.1)	
plt.axis('off')
plt.title('shuffled deck of 52 cards')
plt.ion()


# show the whole shuffled deck 
ax, last_key, card = display_and_play (ax, deck, 2)


starting_num = range(1,11)  # 1..10
for start in starting_num:
	ax, last_key, card = display_and_play (ax, deck, -start)
	print('starting @',start,' the last card (',last_key,') is: ',card)