"""Post — provenance anchor for content downloaded from a Source.

A Post is one creator post; it may contain many images/videos.
"""

from datetime import datetime

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

from .base import Base


class Post(Base):
    __tablename__ = "post"
    __table_args__ = (
        UniqueConstraint("source_id", "external_post_id", name="uq_post_source_external_id"),
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    source_id: Mapped[int] = mapped_column(
        ForeignKey("source.id", ondelete="CASCADE"), nullable=False, index=True
    )
    external_post_id: Mapped[str] = mapped_column(String(128), nullable=False)
    post_url: Mapped[str | None] = mapped_column(Text, nullable=True)
    post_title: Mapped[str | None] = mapped_column(Text, nullable=True)
    post_date: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    raw_metadata: Mapped[dict | None] = mapped_column(JSON, nullable=True)

    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    attachment_count: Mapped[int | None] = mapped_column(Integer, nullable=True)

    downloaded_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )