"""per-download display metadata + auto channel URL

Revision ID: 0049_download_display_meta
Revises: 0048_plex_playlists
Create Date: 2026-07-07

Lets a user override a download's channel and attach extra reference links (beyond the source),
and captures yt-dlp's canonical channel/uploader URL so an auto-filled channel becomes clickable.

- media_assets.uploader_url: the channel page URL yt-dlp recorded (nullable; filled by the worker
  on extraction — older rows just stay plain text).
- download_jobs.display_uploader / display_uploader_url: per-user channel-name + channel-link
  overrides (like display_name — display metadata only, never touches the on-disk file).
- download_jobs.extra_links: optional list of extra reference URLs shown on the card + watch page.
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "0049_download_display_meta"
down_revision: Union[str, None] = "0048_plex_playlists"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column("media_assets", sa.Column("uploader_url", sa.Text(), nullable=True))
    op.add_column("download_jobs", sa.Column("display_uploader", sa.String(length=255), nullable=True))
    op.add_column("download_jobs", sa.Column("display_uploader_url", sa.Text(), nullable=True))
    op.add_column("download_jobs", sa.Column("extra_links", sa.JSON(), nullable=True))


def downgrade() -> None:
    op.drop_column("download_jobs", "extra_links")
    op.drop_column("download_jobs", "display_uploader_url")
    op.drop_column("download_jobs", "display_uploader")
    op.drop_column("media_assets", "uploader_url")