"""notes.display_title

Revision ID: 0012
Revises: 0011
Create Date: 2026-07-22
"""
from alembic import op
import sqlalchemy as sa

revision = "0012"
down_revision = "0011"
branch_labels = None
depends_on = None


def upgrade() -> None:
    # The note's display NAME: explicit title if set, else the first body line.
    op.add_column("notes", sa.Column("display_title", sa.Text(), nullable=False, server_default=""))
    # Best-effort backfill (kept intentionally simple + unambiguous — CI has no
    # Postgres lane, so this only runs on a real deploy). The app recomputes the
    # precise value via derive_display_title on the next save (which additionally
    # skips leading blank lines). Capped at 200 chars.
    op.execute(
        r"""
        UPDATE notes SET display_title = LEFT(btrim(
            CASE
                WHEN title IS NOT NULL AND btrim(title) <> '' THEN title
                ELSE split_part(body, E'\n', 1)
            END
        ), 200)
        """
    )


def downgrade() -> None:
    op.drop_column("notes", "display_title")