import datetime

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

from core.extensions import db


class FuzhouTransportationBureau(db.Model):
    __tablename__ = 'FUZHOU_TRANSPORTATION_BUREAU'
    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')
    price = Column('PRICE', Numeric(16, 4), default=0, comment='价格')
    date = Column('DATE', Date, comment='日期')
    material_id = Column('MATERIAL_ID', String(128), comment='材料id')
    unit = Column('UNIT', String(128), comment='单位')
    brand = Column('BRAND', String(128), comment='品牌')

    __table_args__ = (
        UniqueConstraint(name, spec, date, name='Idx_key'),
        {'comment': '福州交通局'},
    )

    @classmethod
    def get_query(cls, year, month, name):
        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)
        return query