"""ImageProvenance — links an ImageRecord to a Post.

Many-to-one (one image, many provenance rows) enables the enrich-on-duplicate
rule (spec §3): when a downloaded image is a pHash dupe of an existing
record, we append a new provenance row to the existing record rather than
dropping the metadata.
"""

from datetime import datetime

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

from .base import Base


class ImageProvenance(Base):
    __tablename__ = "image_provenance"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    image_record_id: Mapped[int] = mapped_column(
        ForeignKey("image_record.id", ondelete="CASCADE"), nullable=False, index=True
    )
    post_id: Mapped[int] = mapped_column(
        ForeignKey("post.id", ondelete="CASCADE"), nullable=False, index=True
    )
    source_id: Mapped[int] = mapped_column(
        ForeignKey("source.id", ondelete="CASCADE"), nullable=False, index=True
    )
    captured_metadata: Mapped[dict | None] = mapped_column(JSON, nullable=True)
    captured_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )