from typing import Literal
from fastapi import HTTPException
from pydantic import BaseModel, Field
from sqlalchemy import DOUBLE, VARCHAR, Enum, ForeignKey, Integer, Text
from app.models.base_class import Base
from sqlalchemy.orm import Mapped,mapped_column,relationship,Session

class DisplayBoardBase(BaseModel):
    display_board_id : int | None = Field(default=None)
    type : str | None = Field(default=None)
    size : float | None = Field(default=None)
    cost_per_unit : float | None = Field(default=None)
    units : float | None = Field(default=None)
    total : float | None = Field(default=None)
    remark : str | None = Field(default=None)
    choice : str | None = Field(default=None)
    rate_per_sq : float | None = Field(default=None)
    store_format_type : Literal["Store Format A", "Store Format B"] = "Store Format A"
    group_id : int | None = Field(default=None)


class TblDisplayBoard(Base):
    __tablename__ = "tbl_displayboard"
    
    display_board_id : Mapped[int] = mapped_column("display_board_id", Integer, primary_key=True, autoincrement=True)
    type : Mapped[str] = mapped_column("type", VARCHAR(255), nullable=True, server_default=None)
    size : Mapped[float] = mapped_column("size", DOUBLE, nullable=True, server_default=None)
    cost_per_unit : Mapped[float]	= mapped_column("cost_per_unit", DOUBLE, nullable=True, server_default=None)
    units : Mapped[float] = mapped_column("units", DOUBLE, nullable=True, server_default=None)
    total : Mapped[float] = mapped_column("total", DOUBLE, nullable=True, server_default=None)
    remark : Mapped[str] = mapped_column("remark", Text, nullable=True, server_default=None)
    choice : Mapped[str] = mapped_column("choice", VARCHAR(255), nullable=True, server_default=None)
    rate_per_sq : Mapped[float] = mapped_column("rate_per_sq", DOUBLE, nullable=True, server_default=None)
    store_format_type : Mapped[str] = mapped_column(Enum("Store Format A", "Store Format B") )
    group_id: Mapped[int] = mapped_column(Integer, ForeignKey("tbl_group.group_id"), nullable=False)
    
    group = relationship("TblGroup", back_populates="display_board")
    
    @classmethod
    def create(cls, data: DisplayBoardBase, db: Session) ->"TblDisplayBoard":
        data_dict = data.model_dump()
        new_data = cls(**data_dict)
        db.add(new_data)
        db.flush()
        return new_data
    
    @classmethod
    def get_by_display_board_data(cls, group_id:int, db: Session) ->"TblDisplayBoard":
        get_data = db.query(cls).filter(cls.group_id == group_id).all()
        return get_data
    @classmethod
    def update_display_board(
        cls,
        display_board_update_id: int, 
        data: DisplayBoardBase,
        db: Session
    ) -> "TblDisplayBoard":

        db_obj = db.query(cls).filter(
            cls.display_board_id == display_board_update_id
        ).first()

        if not db_obj:
            raise HTTPException(
                status_code=404,
                detail="Display board not found"
            )

        data_dict = data.model_dump(exclude_unset=True)

        for key, value in data_dict.items():
            if value is not None:
                setattr(db_obj, key, value)

        return db_obj   # commit handled in service

    # @classmethod
    # def update_display_board(cls, display_board_update_id: int, data: DisplayBoardBase,db:Session) ->"TblDisplayBoard":
    #     update_data = db.query(cls).filter(cls.display_board_id == display_board_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_display_board(cls, display_board_delete_id: int, db: Session) ->"TblDisplayBoard":
        delete_data = db.query(cls).filter(cls.display_board_id == display_board_delete_id).first()
        if not delete_data:
            return False
        db.delete(delete_data)
        db.commit()
        return True