from fastapi import HTTPException
from pydantic import BaseModel, Field
from sqlalchemy import INTEGER, VARCHAR, Enum, ForeignKey
from sqlalchemy.orm import Mapped, Session, mapped_column, relationship
from app.models.main import Base

class TradingMonthBase(BaseModel):
    trading_id: int | None = Field(default=None)
    group_id: int | None = Field(default=None)
    store_a_trading_months: str | None = Field(default=None)
    store_b_trading_months: str | None = Field(default=None)
    rationale_for_store_a: str | None = Field(default=None)
    rationale_for_store_b: str | None = Field(default=None)

class TblTradingMonth(Base):
    __tablename__ = "tbl_trading_month"

    trading_id: Mapped[int] = mapped_column("trading_id", INTEGER, primary_key=True, autoincrement=True)
    group_id: Mapped[int] = mapped_column(INTEGER, ForeignKey("tbl_group.group_id"), nullable=False)
    store_a_trading_months: Mapped[str] = mapped_column("store_a_trading_months", Enum("3 Months", "6 Months","9 Months","12 Months" ,name="a_trading_month"), nullable=False)
    store_b_trading_months: Mapped[str] = mapped_column("store_b_trading_months", Enum("3 Months", "6 Months","9 Months","12 Months" ,name="b_trading_month"), nullable=False)
    rationale_for_store_a: Mapped[str] = mapped_column("rationale_for_store_a",  VARCHAR(100), nullable=True)
    rationale_for_store_b: Mapped[str] = mapped_column("rationale_for_store_b",  VARCHAR(100), nullable=True)
    
    
    group = relationship("TblGroup", back_populates="trading_month")

    @classmethod
    def create(cls, data: TradingMonthBase, db: Session) -> "TblTradingMonth":
        data_dict = data.model_dump()
        new_data = cls(**data_dict)
        db.add(new_data)
        db.flush()
        return new_data
    
    @classmethod
    def get_trading(cls, trading_id: int, db: Session) -> "TblTradingMonth | None":
        return db.query(cls).filter(cls.trading_id == trading_id).first()
    
    @classmethod
    def get_by_group_id(cls, group_id: int, db: Session) -> "TblTradingMonth":
        trading = db.query(cls).filter(cls.group_id == group_id).all()
        if not trading:
            raise HTTPException(status_code=404, detail="Trading month not found for this Group")
        return trading
    
    @classmethod
    def update(cls, trading_id: int, data: TradingMonthBase, db: Session) -> "TblTradingMonth | None":
        get_data = db.query(cls).filter(cls.trading_id == trading_id).first()
        if not get_data:
            return None  
        data_dict = data.model_dump()
        for key, value in data_dict.items():
            if value is not None:
                setattr(get_data, key, value)
        db.commit()
        db.refresh(get_data)
        return get_data
    
    @classmethod
    def delete(cls, trading_id:int, db:Session) ->"TblTradingMonth":
        delete_data = db.query(cls).filter(cls.trading_id == trading_id).first()
        if not delete_data:
            return False
        db.delete(delete_data)
        db.commit()
        return delete_data