41 lines
1.3 KiB
Python
41 lines
1.3 KiB
Python
"""
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Helper функция для применения скидок к платежам
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Используется всеми платежными обработчиками
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"""
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import logging
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from typing import Optional, Tuple
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from sqlalchemy.ext.asyncio import AsyncSession
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from db.dal import active_discount_dal
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async def apply_discount_to_payment(
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session: AsyncSession,
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user_id: int,
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original_price: float,
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promo_code_service=None
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) -> Tuple[float, Optional[float], Optional[int]]:
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"""
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Apply active discount to payment if exists.
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Returns:
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(final_price, discount_amount, promo_code_id)
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"""
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if not promo_code_service:
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return original_price, None, None
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active_discount = await active_discount_dal.get_active_discount(session, user_id)
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if not active_discount:
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return original_price, None, None
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# Calculate discounted price
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final_price, discount_amount = promo_code_service.calculate_discounted_price(
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original_price, active_discount.discount_percentage
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)
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logging.info(
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f"Applying {active_discount.discount_percentage}% discount to payment for user {user_id}: "
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f"{original_price} -> {final_price}"
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)
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return final_price, discount_amount, active_discount.promo_code_id
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