"""Add users.ui_theme for UI mode persistence (light / dark / system).

Revision ID: 011
Revises: 010
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "011"
down_revision: Union[str, None] = "010"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column(
        "users",
        sa.Column(
            "ui_theme",
            sa.String(16),
            nullable=False,
            server_default=sa.text("'system'"),
        ),
    )
    op.create_check_constraint(
        "ck_users_ui_theme_allowed",
        "users",
        "ui_theme IN ('light', 'dark', 'system')",
    )


def downgrade() -> None:
    op.drop_constraint("ck_users_ui_theme_allowed", "users", type_="check")
    op.drop_column("users", "ui_theme")