from pydantic import BaseModel
from sqlalchemy.orm import Mapped, mapped_column, relationship, Session
from sqlalchemy import ForeignKey, Integer, VARCHAR, Enum, Float
from app.models.base_class import Base
from app.api.centralised_and_direct.schema import CentralisedCreate, DirectCreate
from pydantic import BaseModel
from typing import Optional

class CentralisedAndDirectBase(BaseModel):
    centralised_direct_id: Optional[int] = None
    distribution_type: Optional[str] = None

    # Centralised fields
    about_warehouse: Optional[str] = None
    warehouse_size: Optional[float] = None
    expected_number_of_warehouse: Optional[int] = None
    expected_number_of_warehouse_increase_every_year: Optional[int] = None
    utilities_cost: Optional[float] = None
    employee_cost_per_head: Optional[float] = None
    rental_expenses: Optional[float] = None
    transportation_cost: Optional[float] = None
    number_of_employees: Optional[int] = None
    types: Optional[str] = None
    centralised_additional_remark: Optional[str] = None

    # Direct fields
    about_direct: Optional[str] = None
    space_allotted_in_a_store: Optional[int] = None
    employees_in_charge_at_store_level: Optional[int] = None
    salary_of_each_employee: Optional[float] = None
    unloading_policies: Optional[str] = None
    checking_policies: Optional[str] = None
    direct_additional_remarks: Optional[str] = None

    group_id: Optional[int] = None
    

class TblCentralisedAndDirect(Base):
    __tablename__ = "tbl_centralised_and_direct"

    centralised_direct_id: Mapped[int] = mapped_column(
        "centralised_direct_id", Integer, primary_key=True, autoincrement=True
    )
    distribution_type: Mapped[str] = mapped_column(
        "distribution_type",
        Enum("Centralised Warehouse Distribution", "Direct Store Delivery Distribution"),
    )

    # Centralised Warehouse
    about_warehouse: Mapped[str | None] = mapped_column("about_warehouse", VARCHAR(255), nullable=True)
    warehouse_size: Mapped[float | None] = mapped_column("warehouse_size", Float, nullable=True)
    expected_number_of_warehouse: Mapped[int | None] = mapped_column("expected_number_of_warehouse", Integer, nullable=True)
    expected_number_of_warehouse_increase_every_year: Mapped[int | None] = mapped_column("expected_number_of_warehouse_increase_every_year", Integer, nullable=True)
    utilities_cost: Mapped[float | None] = mapped_column("utilities_cost", Float, nullable=True)
    employee_cost_per_head: Mapped[float | None] = mapped_column("employee_cost_per_head", Float, nullable=True)
    rental_expenses: Mapped[float | None] = mapped_column("rental_expenses", Float, nullable=True)
    transportation_cost: Mapped[float | None] = mapped_column("transportation_cost", Float, nullable=True)
    number_of_employees: Mapped[int | None] = mapped_column("number_of_employees", Integer, nullable=True)
    types: Mapped[str | None] = mapped_column("types", Enum("Putaway", "Flowthrough"), nullable=True)
    centralised_additional_remark: Mapped[str | None] = mapped_column("centralised_additional_remark", VARCHAR(255), nullable=True)
    

    # Direct Store
    about_direct: Mapped[str | None] = mapped_column("about_direct", VARCHAR(255), nullable=True)
    space_allotted_in_a_store: Mapped[int | None] = mapped_column("space_allotted_in_a_store", Integer, nullable=True)
    employees_in_charge_at_store_level: Mapped[int | None] = mapped_column("employees_in_charge_at_store_level", Integer, nullable=True)
    salary_of_each_employee: Mapped[float | None] = mapped_column("salary_of_each_employee", Float, nullable=True)
    unloading_policies: Mapped[str | None] = mapped_column("unloading_policies", VARCHAR(255), nullable=True)
    checking_policies: Mapped[str | None] = mapped_column("checking_policies", VARCHAR(255), nullable=True)
    direct_additional_remarks: Mapped[str | None] = mapped_column("direct_additional_remarks", VARCHAR(255), nullable=True)
    
    group_id: Mapped[int | None] = mapped_column("group_id", ForeignKey("tbl_group.group_id"))
    group = relationship("TblGroup", back_populates="centralised_direct")

    @classmethod
    def create_centralised_and_direct(cls, data: CentralisedCreate | DirectCreate, db: Session, distribution_type: str) -> "TblCentralisedAndDirect":
        data_dict = data.model_dump(exclude_unset=True)
        data_dict["distribution_type"] = distribution_type
        new_data = cls(**data_dict)
        db.add(new_data)
        db.flush()
        return new_data
    
    @classmethod 
    def get_centralised_and_direct(cls, group_id:int, db:Session) ->"TblCentralisedAndDirect":
        get_data = db.query(cls).filter(cls.group_id == group_id).all()
        return get_data
    
    @classmethod
    def update_centralised_and_direct(cls, centralised_direct_id:int, data:CentralisedAndDirectBase, db:Session) ->"TblCentralisedAndDirect":
        update_data = db.query(cls).filter(cls.centralised_direct_id == centralised_direct_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_centralised_and_direct(cls, centralised_direct_id:int, db:Session) ->"TblCentralisedAndDirect":
        delete_data = db.query(cls).filter(cls.centralised_direct_id == centralised_direct_id).first()
        if not delete_data:
            return False
        db.delete(delete_data)
        db.commit()
        return True