"""OAuth-вход (Google/Яндекс): oauth_provider/oauth_id, hashed_password nullable.

Revision ID: 004
Revises: 003
Create Date: 2026-08-24
"""

import sqlalchemy as sa

from alembic import op

revision = "004"
down_revision = "003"
branch_labels = None
depends_on = None


def upgrade() -> None:
    # OAuth-пользователи не заводят пароль
    op.alter_column("users", "hashed_password", nullable=True)

    op.add_column("users", sa.Column("oauth_provider", sa.String(20), nullable=True))
    op.add_column("users", sa.Column("oauth_id", sa.String(255), nullable=True))
    op.create_index(
        "ix_users_oauth_provider_id", "users", ["oauth_provider", "oauth_id"], unique=True
    )


def downgrade() -> None:
    op.drop_index("ix_users_oauth_provider_id", table_name="users")
    op.drop_column("users", "oauth_id")
    op.drop_column("users", "oauth_provider")
    op.alter_column("users", "hashed_password", nullable=False)