from aiogram import Bot, Dispatcher, types

from aiogram.contrib.fsm_storage.memory import MemoryStorage



bot = Bot(token="TOKEN")

storage = MemoryStorage()

dp = Dispatcher(bot, storage=storage)

pizzas = [

    {"name": "Пицца 1", "price": 10, "description": "Описание пиццы 1", "photo": "photo1"},

    {"name": "Пицца 2", "price": 20, "description": "Описание пиццы 2", "photo": "photo2"},

    {"name": "Пицца 3", "price": 30, "description": "Описание пиццы 3", "photo": "photo3"},

    {"name": "Пицца 4", "price": 40, "description": "Описание пиццы 4", "photo": "photo4"},

]

@dp.callback_query_handler(text="category")

async def show_pizzas(call: types.CallbackQuery):

    page = 0  # текущая страница

    per_page = 2  # количество элементов на странице

    

    await show_pizza_page(call.message.chat.id, page, per_page)

async def show_pizza_page(chat_id: int, page: int, per_page: int):

    start_index = page * per_page

    end_index = start_index + per_page

    

    markup = await generate_pizzas_markup(start_index, end_index)

    await bot.send_message(chat_id, "Выберите пиццу:", reply_markup=markup)

async def generate_pizzas_markup(start_index: int, end_index: int) -> types.InlineKeyboardMarkup:

    markup = types.InlineKeyboardMarkup()

    

    for i in range(start_index, end_index):

        if i >= len(pizzas):  # если индекс выходит за пределы списка пицц

            break

        

        pizza = pizzas[i]

        button_text = f"{pizza['name']} - {pizza['price']} руб."

        callback_data = f"pizza:{i}"

        markup.add(

            types.InlineKeyboardButton(button_text, callback_data=callback_data)

        )

    

    pagination_row = types.InlineKeyboardRow()

    

    if start_index > 0:

        pagination_row.add(

            types.InlineKeyboardButton("Назад", callback_data="prev")

        )



    if end_index < len(pizzas):

        pagination_row.add(

            types.InlineKeyboardButton("Далее", callback_data="next")

        )

    

    markup.add(pagination_row)

    return markup

@dp.callback_query_handler(lambda c: c.data in ["prev", "next"])

async def handle_pagination(call: types.CallbackQuery):

    page = int(call.message.text.split(":")[-1])  # получаем текущую страницу из текста сообщения



    if call.data == "prev":

        page -= 1

    elif call.data == "next":

        page += 1



    await show_pizza_page(call.message.chat.id, page, per_page)

    

@dp.callback_query_handler(lambda c: c.data.startswith("pizza:"))

async def handle_pizza(call: types.CallbackQuery):

    pizza_index = int(call.data.split(":")[-1])

    pizza = pizzas[pizza_index]

    

    photo = pizza["photo"]

    caption = f"{pizza['name']}nn{pizza['description']}nnЦена: {pizza['price']} руб."

    

    await bot.send_photo(call.message.chat.id, photo, caption)

from aiogram import Bot, Dispatcher, types

from aiogram.contrib.fsm_storage.memory import MemoryStorage



bot = Bot(token="TOKEN")

storage = MemoryStorage()

dp = Dispatcher(bot, storage=storage)



pizzas = [

    {"name": "Пицца 1", "price": 10, "description": "Описание пиццы 1", "photo": "photo1"},

    {"name": "Пицца 2", "price": 20, "description": "Описание пиццы 2", "photo": "photo2"},

    {"name": "Пицца 3", "price": 30, "description": "Описание пиццы 3", "photo": "photo3"},

    {"name": "Пицца 4", "price": 40, "description": "Описание пиццы 4", "photo": "photo4"},

]



@dp.callback_query_handler(text="category")

async def show_pizzas(call: types.CallbackQuery):

    page = 0  # текущая страница

    per_page = 2  # количество элементов на странице

    

    await show_pizza_page(call.message.chat.id, page, per_page)



async def show_pizza_page(chat_id: int, page: int, per_page: int):

    start_index = page * per_page

    end_index = start_index + per_page

    

    markup = await generate_pizzas_markup(start_index, end_index)

    await bot.send_message(chat_id, "Выберите пиццу:", reply_markup=markup)



async def generate_pizzas_markup(start_index: int, end_index: int) -> types.InlineKeyboardMarkup:

    markup = types.InlineKeyboardMarkup()

    

    for i in range(start_index, end_index):

        if i >= len(pizzas):  # если индекс выходит за пределы списка пицц

            break

        

        pizza = pizzas[i]

        button_text = f"{pizza['name']} - {pizza['price']} руб."

        callback_data = f"pizza:{i}"

        markup.add(

            types.InlineKeyboardButton(button_text, callback_data=callback_data)

        )

    

    pagination_row = types.InlineKeyboardRow()

    

    if start_index > 0:

        pagination_row.add(

            types.InlineKeyboardButton("Назад", callback_data="prev")

        )



    if end_index < len(pizzas):

        pagination_row.add(

            types.InlineKeyboardButton("Далее", callback_data="next")

        )

    

    markup.add(pagination_row)

    return markup



@dp.callback_query_handler(lambda c: c.data in ["prev", "next"])

async def handle_pagination(call: types.CallbackQuery):

    page = int(call.message.text.split(":")[-1])  # получаем текущую страницу из текста сообщения



    if call.data == "prev":

        page -= 1

    elif call.data == "next":

        page += 1



    await show_pizza_page(call.message.chat.id, page, per_page)

    

@dp.callback_query_handler(lambda c: c.data.startswith("pizza:"))

async def handle_pizza(call: types.CallbackQuery):

    pizza_index = int(call.data.split(":")[-1])

    pizza = pizzas[pizza_index]

    

    photo = pizza["photo"]

    caption = f"{pizza['name']}nn{pizza['description']}nnЦена: {pizza['price']} руб."

    

    await bot.send_photo(call.message.chat.id, photo, caption)