import datetime

from calculators import Calculator, Helper
from commons.models.oil import Oil

from commons.models.price_result import PriceResult


class Oil89Calculator(Calculator):
    name = "汽油（89）"
    material_id = "69.60.60.00"
    unit = "kg"
    spec = "89#"

    def __init__(self, year, month):
        self.year = year
        self.month = month

    def _get_network_price(self):
        name_in = ('车用89号汽油（ⅥB）',)
        # 获取上月末价格
        previous_items = Oil.get_items(*Helper.get_last_month(self.year, self.month), name_in=name_in)
        previous_item = previous_items[-1]
        previous_price = previous_item.price

        current_items = Oil.get_items(self.year, self.month, name_in=name_in)
        # 从本月1号开始计算加权总数
        start_date = datetime.date(self.year, self.month, 1)
        previous_date = start_date
        total_with_weight = 0
        for item in current_items:
            total_with_weight += previous_price * (item.date - previous_date).days
            previous_price = item.price
            previous_date = item.date
        # 直到月末
        end_date = datetime.date(*Helper.get_next_month(self.year, self.month), 1) - datetime.timedelta(days=1)
        if end_date > previous_date:
            total_with_weight += previous_price * (end_date - previous_date).days
        # 计算
        price = round(total_with_weight / (end_date - start_date).days) / 1000
        fluctuating = price - int(getattr(self.previous_prices, 'price_network', price))

        return round(price, 2), round(fluctuating, 2)

    def _get_calculate_price(self, round_dit=2):
        return super()._get_calculate_price(round_dit)

    def _get_recommend_price(self):
        return self.price_network, self.fluctuating_network

    def save(self):
        result = self.result()
        PriceResult(**result).upsert()


if __name__ == '__main__':
    from core.factory import ClientApp

    with ClientApp().app_context():
        calculator = Oil89Calculator(year=2023, month=11)
        result = calculator.run()
        calculator.save()
        print(result)