"""user_acknowledgements: affirmative sign-up acknowledgement audit table.

Revision ID: 0027
Revises: 0026
Create Date: 2026-05-29

One row per (user, version) acceptance of the /login acknowledgement.
See app/models.py::UserAcknowledgement and app/legal.py for context.
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op


revision: str = "0027"
down_revision: Union[str, None] = "0026"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "user_acknowledgements",
        sa.Column(
            "id",
            sa.BigInteger().with_variant(sa.Integer(), "sqlite"),
            primary_key=True, autoincrement=True,
        ),
        sa.Column(
            "user_id", sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("version", sa.SmallInteger(), nullable=False),
        sa.Column("lang", sa.String(length=8), nullable=False),
        sa.Column(
            "accepted_at", sa.DateTime(timezone=True), nullable=False,
            server_default=sa.text("CURRENT_TIMESTAMP"),
        ),
    )
    op.create_index(
        "ix_user_acknowledgements_user_version",
        "user_acknowledgements", ["user_id", "version"],
    )
    op.create_index(
        "ix_user_acknowledgements_accepted_at",
        "user_acknowledgements", ["accepted_at"],
    )


def downgrade() -> None:
    op.drop_index(
        "ix_user_acknowledgements_accepted_at",
        table_name="user_acknowledgements",
    )
    op.drop_index(
        "ix_user_acknowledgements_user_version",
        table_name="user_acknowledgements",
    )
    op.drop_table("user_acknowledgements")