import datetime

from dateutil.relativedelta import relativedelta
from sqlalchemy import Column, Integer, String, Numeric, Date, UniqueConstraint

from commons.models.mixin.base import BaseModelMixin
from commons.models.model import Model
from core.extensions import db


class SanmingSteel(db.Model, Model, BaseModelMixin):
    __tablename__ = 'SANMING_STEEL'
    id = Column('ID', Integer, primary_key=True)
    name = Column('NAME', String(128), default='', comment='名称')
    spec = Column('SPEC', String(128), default='', comment='规格')
    material = Column('MATERIAL', String(64), default='', comment='材质')
    price = Column('PRICE', Numeric(16, 4), default=0, comment='价格')
    fluctuating = Column('FLUCTUATING', Numeric(16, 4), default=0, comment='浮动')
    date = Column('DATE', Date, comment='日期')

    __table_args__ = (
        UniqueConstraint(name, spec, date, name='Idx_key'),
        {'comment': '三明钢铁'},
    )

    def find_by_key(self):
        query = SanmingSteel.query
        query = query.filter(SanmingSteel.name == self.name)
        query = query.filter(SanmingSteel.spec == self.spec)
        query = query.filter(SanmingSteel.date == self.date)
        result = query.one_or_none()
        return result

    @classmethod
    def get_query(cls, year, month, name, spec):
        start_date = datetime.date(year, month, 1)
        end_date = start_date + relativedelta(months=1)
        query = cls.query
        query = query.filter(cls.date >= start_date)
        query = query.filter(cls.date < end_date)
        if name:
            query = query.filter(cls.name == name)
        if spec:
            query = query.filter(cls.spec == spec)
        return query