"""users table — accounts, password hashing (argon2), tier, settings

Phase A of the multi-user migration. Adds the table but doesn't add owner
FKs to existing rows yet — that's phase C. Until then, data is still
effectively shared across the (small) set of authenticated accounts.

Revision ID: 0007
Revises: 0006
Create Date: 2026-05-16
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op


revision: str = "0007"
down_revision: Union[str, None] = "0006"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "users",
        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
        sa.Column("email", sa.String(255), nullable=False),
        sa.Column("password_hash", sa.String(255), nullable=False),
        sa.Column("tier", sa.String(16), nullable=False, server_default="free"),
        # Not enforced in phase A — wired up in phase E.
        sa.Column("email_verified", sa.Boolean, nullable=False, server_default=sa.text("0")),
        sa.Column("settings_json", sa.JSON),   # per-user tone/analysis/anchor/...
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column("last_login_at", sa.DateTime(timezone=True)),
        sa.UniqueConstraint("email", name="uq_users_email"),
    )


def downgrade() -> None:
    op.drop_table("users")