local deck_name = "russian"
local deck = {}
local card_file = rb.current_path() .. deck_name .. ".txt"
local action = ""
local null, font_w, font_h = rb.font_getstringsize("a", rb.FONT_UI)
local char_w = rb.LCD_WIDTH / font_w

function print_card(card_no, total_cards, top, bottom)
    rb.lcd_clear_display()
    rb.lcd_puts(22, 0, card_no .. "/" .. total_cards)
	local foo, top_w, top_h = rb.font_getstringsize(top, rb.FONT_UI)
	local top_len = rb.utf8length(top)
	if (top_w >= rb.LCD_WIDTH ) then
		rb.lcd_puts_scroll(0, 1, top)
	else
		rb.lcd_puts(((char_w - top_len) / 2 ) + 1, 1, top)
	end
    rb.lcd_update()
    press()
	local foo, bottom_w, bottom_h = rb.font_getstringsize(bottom, rb.FONT_UI)
	local bottom_len = rb.utf8length(bottom)
	if (bottom_w >= rb.LCD_WIDTH ) then
		rb.lcd_puts_scroll(0, 3, bottom)
	else
		rb.lcd_puts(((char_w - bottom_len) / 2 ) + 1, 3, bottom)
	end
    rb.lcd_update()
    press()
end

function load_deck()
    local card_no = 1
    for line in io.lines(card_file) do
        deck[card_no] = {}
        deck[card_no][1], deck[card_no][2] = parse_line(line)       
    card_no = card_no + 1
    end
end

function parse_line(line)
    index = string.find(line, "	") + 1
    top = string.match(line, "(.+)%[")
    sound = string.match(line, "%[(.+)%]")
    bottom = string.match(line, "(.+)", index)
    return top, bottom, sound
end

function print_deck_in_order()
    for i = 1,#deck do
	if action == "back" then
	    i = i - 2
	end
        print_card(i, #deck, deck[i][1], deck[i][2])
    end
end


function print_deck_at_random()
    for i = 1,#deck do
	rand = (rb.rand() * #deck) / 2147483647
        print_card(rand, #deck, deck[rand][1], deck[rand][2])
    end
end


function press()
    rb.button_clear_queue()
    rb.button_get(1)
    rb.lcd_update()
    while rb.button_status(0) > 0 do
        if rb.button_status(0) > 255 then 
            os.exit()
		elseif rb.button_status(0) == 32 then
	    action = "back"
        else 
            action = ""
        end
	rb.sleep(rb.HZ/60)
    end
end

load_deck()
print_deck_in_order()