from datetime import datetime
from typing import Optional

from sqlalchemy import String, DateTime, Boolean, ForeignKey, Integer, func
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy import JSON

from app.database import Base


class Column(Base):
    __tablename__ = "columns"

    id: Mapped[int] = mapped_column(primary_key=True)
    table_id: Mapped[int] = mapped_column(
        ForeignKey("tables.id", ondelete="CASCADE"), nullable=False, index=True
    )
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    type: Mapped[str] = mapped_column(
        String(50), nullable=False
    )  # text, number, date, select, etc.
    required: Mapped[bool] = mapped_column(Boolean, default=False)
    default_value: Mapped[Optional[str]] = mapped_column(String, nullable=True)
    position: Mapped[int] = mapped_column(Integer, default=0)
    options: Mapped[Optional[dict]] = mapped_column(
        JSON, nullable=True
    )  # For select type: {"options": ["a", "b"]}
    created_at: Mapped[datetime] = mapped_column(DateTime, default=func.now())

    # Relationships
    table = relationship("Table", back_populates="columns")
    cell_values = relationship(
        "CellValue", back_populates="column", cascade="all, delete-orphan"
    )
    attachments = relationship("Attachment", back_populates="column")

    def __repr__(self):
        return f"<Column(id={self.id}, name={self.name}, type={self.type})>"