from api import Tronscan
from custom_decorators import singleton
from utils.datetime import current_timestamp


@singleton
class PaymentService:
    def __init__(self, api_key):
        self.tronscan = Tronscan(api_key)

    def check_payment(self, quant, from_address, to_address, order_create_timestamp, end_timestamp=None):
        if end_timestamp is None:
            end_timestamp = current_timestamp()
        result = self.tronscan.token_trc20_transfers(limit=100,
                                                     from_address=from_address, to_address=to_address,
                                                     start_timestamp=order_create_timestamp, end_timestamp=end_timestamp)
        if result['rangeTotal'] == 0:
            return -1, 0
        token_transfers = result['token_transfers']
        token_transfer = token_transfers[-1]
        confirmed = token_transfer['confirmed']
        correct_quant = int(quant == (token_transfer['quant'] / 6))
        return correct_quant, confirmed