"""
Flexible storage for unmapped CSV columns during import
"""
from sqlalchemy import Column, Integer, String
from sqlalchemy.types import JSON

from app.models.base import BaseModel


class FlexibleImport(BaseModel):
    """Stores per-row extra/unmapped data for any import, without persisting mapping patterns."""

    __tablename__ = "flexible_imports"

    id = Column(Integer, primary_key=True, autoincrement=True)

    # The CSV filename used by the importer (e.g., "FILES.csv" or arbitrary names in flexible mode)
    file_type = Column(String(120), nullable=False, index=True)

    # The SQLAlchemy model table this extra data is associated with (if any)
    target_table = Column(String(120), nullable=True, index=True)

    # Optional link to the primary record created in the target table
    primary_key_field = Column(String(120), nullable=True)
    primary_key_value = Column(String(255), nullable=True, index=True)

    # Extra unmapped columns from the CSV row
    extra_data = Column(JSON, nullable=False)

    def __repr__(self) -> str:  # pragma: no cover - repr utility
        return (
            f"<FlexibleImport(id={self.id}, file_type='{self.file_type}', "
            f"target_table='{self.target_table}', pk_field='{self.primary_key_field}', "
            f"pk_value='{self.primary_key_value}')>"
        )