"""Add oauth_accounts table, nullable password_hash, avatar_url to users.

Revision ID: b4c0d1e2f3a4
Revises: a3b9c0d1e2f3
Create Date: 2026-04-10 00:00:00.000000

"""
from __future__ import annotations

from typing import Sequence, Union

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


# revision identifiers, used by Alembic.
revision: str = "b4c0d1e2f3a4"
down_revision: Union[str, None] = "a3b9c0d1e2f3"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # ── users: make password_hash nullable (social users have no password) ──
    op.alter_column("users", "password_hash", existing_type=sa.String(255), nullable=True)

    # ── users: add avatar_url ─────────────────────────────────────────────
    op.add_column("users", sa.Column("avatar_url", sa.String(2048), nullable=True))

    # ── oauth_accounts ────────────────────────────────────────────────────
    op.create_table(
        "oauth_accounts",
        sa.Column("id", postgresql.UUID(as_uuid=False), nullable=False),
        sa.Column("user_id", postgresql.UUID(as_uuid=False), nullable=False),
        sa.Column("provider", sa.String(50), nullable=False),
        sa.Column("provider_user_id", sa.String(255), nullable=False),
        sa.Column("provider_email", sa.String(255), nullable=True),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.text("now()"),
        ),
        sa.PrimaryKeyConstraint("id"),
        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
        sa.UniqueConstraint("provider", "provider_user_id", name="uq_oauth_provider_user"),
    )
    op.create_index("ix_oauth_accounts_user_id", "oauth_accounts", ["user_id"])


def downgrade() -> None:
    op.drop_index("ix_oauth_accounts_user_id", table_name="oauth_accounts")
    op.drop_table("oauth_accounts")
    op.drop_column("users", "avatar_url")
    op.alter_column("users", "password_hash", existing_type=sa.String(255), nullable=False)