from fastapi import HTTPException
from pydantic import Field
from sqlalchemy import DOUBLE, INTEGER, VARCHAR, Enum, ForeignKey, Text
from sqlalchemy.orm import (Mapped,Session,mapped_column,relationship)
from app.models.main import Base
from app.utils.schemas_utils import CustomModel

class SegmentBase(CustomModel):
    segment_id: int | None = Field(default=None)
    name: str | None = Field(default=None)
    location: str | None = Field(default=None)
    chief_wage_earner_occupation: str | None = Field(default=None)
    highest_educated_male: str | None = Field(default=None)
    highest_educated_female: str | None = Field(default=None)
    ISEC_Segment: int | None = Field(default=None)
    total_population : int | None = Field(default=None)
    other_details : str | None = Field(default=None)
    additional_information : str | None = Field(default=None)
    group_id: int | None = Field(default=None)
    
    # @field_validator("name")
    # def validate_other_details(cls, value):
    #     if value is None:
    #         return value
    #     words = str(value).strip().split()
    #     if len(words) != 5:
    #         raise ValueError("name must contain exactly 5 words.")
    #     return value

# class ActiveEnum(str,Enum):
#     new="new"

class TblSegment(Base):
    __tablename__ = "tbl_segment"

    segment_id: Mapped[int] = mapped_column("segment_id", INTEGER, primary_key=True, autoincrement=True)
    name: Mapped[str] = mapped_column("name", VARCHAR(255), nullable=False)
    location: Mapped[str] = mapped_column("location", VARCHAR(255), nullable=False)
    chief_wage_earner_occupation: Mapped[str] = mapped_column(
        "chief_wage_earner_occupation",
        VARCHAR(255),
        nullable=False
    )
    highest_educated_male: Mapped[str] = mapped_column(
        "highest_educated_male", 
        VARCHAR(255),
        nullable=False
    )
    highest_educated_female: Mapped[str] = mapped_column(
        "highest_educated_female", 
        VARCHAR(255),
        nullable=False
    )
    ISEC_Segment: Mapped[int] = mapped_column("ISEC_Segment", INTEGER, nullable=False)
    total_population: Mapped[int] = mapped_column("total_population", DOUBLE, nullable=True)
    other_details : Mapped[int] = mapped_column("other_details",Text, nullable=False)
    additional_information : Mapped[str] = mapped_column("additional_information", Text, nullable=True, server_default=None)
    group_id: Mapped[int] = mapped_column("group_id", INTEGER, ForeignKey("tbl_group.group_id"), nullable=False)

    group = relationship("TblGroup", back_populates="segment")

    @classmethod
    def create(cls, data: SegmentBase, db: Session) -> "TblSegment":
        new_data = cls(**data.model_dump())  
        db.add(new_data)  
        db.flush() 
        return new_data

    @classmethod
    def get_by_id(cls, segment_id: int, db: Session) -> "TblSegment | None":
        return db.query(cls).filter(cls.segment_id == segment_id).first()
    
    @classmethod
    def get_by_group_id(cls, group_id: int, db: Session) -> "TblSegment":
        segment = db.query(cls).filter(cls.group_id == group_id).all()
        if not segment:
            raise HTTPException(status_code=404, detail="Segment not found for this Group")
        return segment

    @classmethod
    def update(cls, segment_id: int, data: SegmentBase, db: Session) -> "TblSegment | None":
        get_data = db.query(cls).filter(cls.segment_id == segment_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, segment_id: int, db: Session) -> bool:
        obj = db.query(cls).filter(cls.segment_id == segment_id).first()
        if not obj:
            return False
        db.delete(obj)
        db.commit()
        return True