"""add missing columns if users table exists without them

Revision ID: 003
Revises: 002
Create Date: 2025-02-05

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa

revision: str = "003"
down_revision: Union[str, None] = "002"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # 检查 users 表是否存在 role 列，若不存在则添加
    conn = op.get_bind()
    inspector = sa.inspect(conn)
    columns = [c["name"] for c in inspector.get_columns("users")] if inspector.has_table("users") else []
    
    if "users" in inspector.get_table_names():
        if "role" not in columns:
            op.add_column("users", sa.Column("role", sa.String(32), nullable=False, server_default="admin"))
        if "is_active" not in columns:
            op.add_column("users", sa.Column("is_active", sa.Boolean(), nullable=False, server_default="true"))
        if "created_at" not in columns:
            op.add_column("users", sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=True))


def downgrade() -> None:
    # 可选：移除这些列（通常不需要）
    pass