"""Add musehub_auth_keys table for Ed25519 public-key authentication.

Each row is one registered Ed25519 public key that may authenticate as a
MuseHub identity.  The challenge-response flow is stateless (nonces are
short-lived hex tokens); only the long-lived public key registration lives here.

Revision ID: 0007
Revises: 0006
"""
from __future__ import annotations

import sqlalchemy as sa
from alembic import op

revision = "0007"
down_revision = "0006"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "musehub_auth_keys",
        sa.Column("key_id", sa.String(36), primary_key=True),
        sa.Column(
            "identity_id",
            sa.String(36),
            sa.ForeignKey("musehub_identities.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("public_key_b64", sa.String(64), nullable=False),
        sa.Column("fingerprint", sa.String(64), nullable=False),
        sa.Column("label", sa.String(255), nullable=False, server_default=""),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.Column("last_used_at", sa.DateTime(timezone=True), nullable=True),
        sa.UniqueConstraint("fingerprint", name="uq_musehub_auth_keys_fingerprint"),
    )
    op.create_index("ix_musehub_auth_keys_identity_id", "musehub_auth_keys", ["identity_id"])


def downgrade() -> None:
    op.drop_index("ix_musehub_auth_keys_identity_id", table_name="musehub_auth_keys")
    op.drop_table("musehub_auth_keys")