import datetime

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

from core.extensions import db


class SanmingSteel(db.Model):
    __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, material, date, name='Idx_key'),
        {'comment': '三明钢铁'},
    )

    @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