"""Expand generic notifications and route desktop delivery through them.

Revision ID: 20260716_05
Revises: 20260716_04
"""

import sqlalchemy as sa
from alembic import op
from sqlalchemy.dialects import postgresql


revision = "20260716_05"
down_revision = "20260716_04"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.add_column(
        "notifications",
        sa.Column("requires_action", sa.Boolean(), nullable=False, server_default=sa.true()),
    )
    op.add_column(
        "notifications",
        sa.Column("due_at", sa.DateTime(timezone=True), nullable=True),
    )
    op.alter_column("desktop_notification_deliveries", "distribution_id", nullable=True)
    op.add_column(
        "desktop_notification_deliveries",
        sa.Column("notification_id", postgresql.UUID(as_uuid=True), nullable=True),
    )
    op.create_foreign_key(
        "fk_desktop_notification_deliveries_notification",
        "desktop_notification_deliveries",
        "notifications",
        ["notification_id"],
        ["id"],
        ondelete="CASCADE",
    )
    op.create_unique_constraint(
        "uq_desktop_notification_user_notification",
        "desktop_notification_deliveries",
        ["user_id", "notification_id"],
    )


def downgrade() -> None:
    op.drop_constraint(
        "uq_desktop_notification_user_notification",
        "desktop_notification_deliveries",
        type_="unique",
    )
    op.drop_constraint(
        "fk_desktop_notification_deliveries_notification",
        "desktop_notification_deliveries",
        type_="foreignkey",
    )
    op.drop_column("desktop_notification_deliveries", "notification_id")
    # Legacy rows always have a distribution id; rows created by the generic delivery path do not.
    op.execute("DELETE FROM desktop_notification_deliveries WHERE distribution_id IS NULL")
    op.alter_column("desktop_notification_deliveries", "distribution_id", nullable=False)
    op.drop_column("notifications", "due_at")
    op.drop_column("notifications", "requires_action")