import enum
from pydantic import BaseModel, Field
from sqlalchemy.orm import Mapped,mapped_column,Session,relationship
from sqlalchemy import ForeignKey, Integer, VARCHAR, Enum
from app.models.base_class import Base

class SalesEstimateBase(BaseModel):
    sales_id : int | None = Field(default=None)
    parameter : str | None = Field(default=None)
    value : int | None = Field(default=None)
    remark : str | None = Field(default=None)
    store_formate_type : str | None = Field(default=None)
    group_id : int | None = Field(default=None)
    
class ParameterEnum(str, enum.Enum):
    GROSS_MARGIN = "Gross Margin % Estimate"
    BILLS_PER_MONTH = "Number of Bills per Month"
    ITEMS_PER_BILL = "Number of Items per Bill"
    AVG_PRICE = "Average Price per item (in Rupees)"

class StoreFormatEnum(str, enum.Enum):
    FORMAT_A = "Store Format A"
    FORMAT_B = "Store Format B"

class TblSalesEstimate(Base):
    __tablename__ = "tbl_sales_estimate"
    
    
    sales_id : Mapped[int] = mapped_column("sales_id", Integer, primary_key=True, autoincrement=True)
    parameter : Mapped[str] = mapped_column(Enum(ParameterEnum))
    value : Mapped[int] = mapped_column("value", Integer, nullable=True, server_default=None)
    remark : Mapped[str] = mapped_column("remark", VARCHAR(255), nullable=True, server_default=None)
    store_formate_type : Mapped[str] = mapped_column(Enum(StoreFormatEnum))
    group_id : Mapped[int] = mapped_column("group_id", Integer, ForeignKey("tbl_group.group_id"))
    
    group = relationship("TblGroup", back_populates="sales_estimate")
    
    @classmethod
    def create_sales_estimate(cls, data:SalesEstimateBase, db:Session) ->"TblSalesEstimate":
        data_dict = data.model_dump()
        new_data = cls(**data_dict)
        db.add(new_data)
        db.flush()
        return new_data
    
    @classmethod
    def get_sales_estimate(cls, sales_get_id:int, db:Session) ->"TblSalesEstimate":
        get_data = db.query(cls).filter(cls.sales_id == sales_get_id).first()
        return get_data
    
    @classmethod
    def update_sales_estimate(cls, sales_update_id:int, data:SalesEstimateBase, db:Session) ->"TblSalesEstimate":
        update_data = db.query(cls).filter(cls.sales_id == sales_update_id).first()
        data_dict = data.model_dump()
        for key, value in data_dict.items():
            if value is not None:
                setattr(update_data, key, value)
        db.commit()
        db.refresh(update_data)
        return update_data
    
    @classmethod
    def delete_sales_estimate(cls, sales_id:int, db:Session) ->"TblSalesEstimate":
        delete_data = db.query(cls).filter(cls.sales_id == sales_id).filter()
        if not delete_data:
            return False
        db.delete(delete_data)
        db.commit()
        return True