from math import log
import random
from functions import insert_linebreaks

groups_left = ['humans', 'humans', 'machines', 'machines', 'humans', 'machines', 'machines', 'humans']
groups_right = ['humans', 'machines', 'machines', 'humans', 'machines', 'machines', 'humans', 'humans']
verb = 'learn'
relations = ['from', 'with']
symbols = ['◜', '◝', '◞', '◟', '◠', '◡']

def create_backcover(steps=1):
	linewidth = 110
	lines_per_page = 70
	maximum = 100

	tmp = ''
 
	for i in range(1, maximum):
		tmp += random.choice(symbols)
		tmp += ' '
		tmp += groups_left[i % len(groups_left)]
		tmp += ' '
		tmp += verb
		tmp += ' '
		tmp += relations[i % 2]
		tmp += ' '
		tmp += groups_right[i % len(groups_right)]
		tmp += ' '
		tmp += random.choice(symbols)
		tmp += ' ' * int(log(i) + 5)

	for i in reversed(range(1, maximum)):
		tmp += ' ' * int(log(i) + 5)
		tmp += random.choice(symbols)
		tmp += ' '
		tmp += groups_left[i % len(groups_left)]
		tmp += ' '
		tmp += verb
		tmp += ' '
		tmp += relations[i % 2]
		tmp += ' '
		tmp += groups_right[i % len(groups_right)]
		tmp += ' '
		tmp += random.choice(symbols)

	out = insert_linebreaks(tmp, linewidth)
	out = '\n'.join(out.split('\n')[:lines_per_page]) # select the lines to fill one page
	return out + '\n'

# print(create_backcover(steps=1))