'''
Mission 7 - Personal Billboard
Medium Remix 3B
This remix uses two lists that are subject related. Each list
has seven items. It can be any number, but they should each have
the same number of items. The English list shows how to print on 
multiple lines. This only works with display.print(), not display.show().
Because print statements keep printing, there is a sleep followed by a
clear so it doesn't just scroll down the screen continuously.
-It also includes the button to break the loop and end the program-
'''

from codex import *
from time import sleep

choice = 0
my_english = ["Noun: \nperson, place, thing\npirate, apple, bird",
            "Pronoun: \nstands in for noun\nI, you, he"
            "Adjective: \ndescribes a noun\nblue, funny, cute",
            "Verb: \naction \neat, sing, jump",
            "Adverb: \ndescribes a verb\nquickly, loudly, very",
            "Preposition: \nshows a relationship\nto, in, from",
            "Conjunction: \njoins words\nand, but, or"]
my_science = ["Around 2900 BC King Menes united the 2 parts of Egypt. ",
            "The capital of early Egypt was Memphis.",
            "The Old Kingdom of Egypt lasted from 2575 to 2130 BC.",
            "The great pyramids were built during the Old Kingdom.",
            "The Middle Kingdom was a period of art and architecure.",
            "A mighty pharaoh of the New Kingdom was Thutmose III.",
            "During the New Kingdom, Ramses II carried out a vast building program."]
LAST_INDEX = len(my_english) - 1
my_list = my_english

while True:
    # display the fact, wait, and then clear screen
    my_fact = my_list[choice]
    display.print(my_fact)
    sleep(2)
    display.clear()

    # select the list to display
    if buttons.was_pressed(BTN_A):
        my_list = my_english
    
    if buttons.was_pressed(BTN_B):
        my_list = my_science

    # scroll forward and backward
    if buttons.was_pressed(BTN_L):
        choice = choice - 1
        if choice < 0:
            choice = LAST_INDEX

    if buttons.was_pressed(BTN_R):
        choice = choice + 1
        if choice > LAST_INDEX:
            choice = 0
   
    # break out of the loop to quit
    if buttons.was_pressed(BTN_D):
        break