ShopBot/keyboard/inline/catalog.py

from aiogram.types.inline_keyboard import InlineKeyboardMarkup, InlineKeyboardButton

from load import messages


def item_list(item: int = 0, items: int = 1, user_count: int = 1) -> InlineKeyboardMarkup:
    markup = InlineKeyboardMarkup()
    default = [
        InlineKeyboardButton(str(user_count), callback_data='null')
    ]
    back = ['⬅️', f"prev|{item-1}|{user_count-1}"]
    next = ['➡️', f"next|{item+1}|{user_count+1}"]

    if items < 1 or item >= items:
        next = [" ", "null"]
    
    if item == 0:
        back = [" ", "null"]

    default.append(InlineKeyboardButton(next[0], callback_data=next[1]))

    markup.add(InlineKeyboardButton(back[0], callback_data=back[1]), *default)
    markup.row(InlineKeyboardButton(messages.add_to_cart, callback_data=f"add_to_cart|{item}"))
    return markup