'''
Mission 7 - Personal Billboard
Medium Remix 2
This remix uses one list that can contain any items. For the remix, 
an introductory message, wait loop and ending message are added.
-It also includes the button to break the loop and end the program-
'''

from codex import *

choice = 0
my_list = [GREEN, "Ahoy", pics.HAPPY, 
            pics.SAD, RED, pics.SURPRISED,
            "Having a great day", 
            pics.ASLEEP, PINK, pics.TIARA,
            "Meh", pics.TARGET]
LAST_INDEX = len(my_list) - 1

# Main Program
display.print("Welcome to")
display.print("my program")
display.print("")
display.print("Press L/R to")
display.print("scroll the list")
display.print("")
display.print("Press U to start")
display.print("Press D to end")

# MAIN PROGRAM
# wait loop - program starts when U is pressed
while True:
    if buttons.was_pressed(BTN_U):
        break

# while loop for displaying items from list
while True:
    # display the item
    my_image = my_list[choice]
    if type(my_image) == tuple:
        display.fill(my_image)
    else:
        display.show(my_image)

    # 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 loop to quit
    if buttons.was_pressed(BTN_D):
        break

# Ending message after loop stops
display.fill(GREEN)
display.show("The End")