import datetime

from sqlalchemy import Column, Integer, String, Numeric, Date, UniqueConstraint, func

from calculators import Helper
from commons.models.mixin.steel import SteelMixin
from core.extensions import db


class SteelRebar(db.Model, SteelMixin):
    __tablename__ = 'STEEL_REBAR'
    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')
    source = Column('SOURCE', String(64), default='', comment='产地')
    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, source, date,  name='Idx_key'),
        {'comment': '钢筋'},
    )

    @classmethod
    def query_by_month(cls, query, year, month):
        last_month_year, last_month = Helper.get_last_month(year, month)
        query = query.filter(cls.date >= datetime.date(last_month_year, last_month, 26))
        query = query.filter(cls.date <= datetime.date(year, month, 25))
        return query

    @classmethod
    def get_items(cls, year, month, material, source='三钢闽光', name_in=('高线', '螺纹钢')):
        query = cls.query
        query = cls.query_by_month(query, year, month)
        query = query.filter(cls.material == material)
        query = query.filter(cls.source == source)
        query = query.filter(cls.name.in_(name_in))
        query = query.with_entities(cls.spec, cls.material, func.avg(cls.price))
        query = query.group_by(cls.spec, cls.material)
        result = query.all()

        return result