"""ui_settings: the 8 semantic state colors (phase 93, task 01)

Revision ID: 0016
Revises: 0015
Create Date: 2026-09-10

Phase 93 (theme completion — the owner's black/white/gray theme still
leaked color: the green "Theme saved." text, the red Stale/Revoked
pills, the green LOCAL badge, the amber tool-call lines): the three
semantic state families (``--ok-*``, ``--err-*``, ``--accent-*``) join
the storable palette as 8 more tab-controlled variables (17 total —
B3 revised, owner permission 2026-09-10, TODO.md L3; PLAN.md is being
redone by the owner, the decision is recorded in the phase overview).
They flow through the resolver, the pre-paint tag, the CSP hash, and
the admin API exactly like the 9 identity colors (all of those are
``COLOR_FIELDS``-driven — zero logic changes):

* ``ui_settings.ok_bg`` / ``ok_ink`` — VARCHAR(7) NULL ``#rrggbb``
  (NULL = the built-ins ``#10241b`` / ``#6ee7a8`` — exact);
* ``ui_settings.err_bg`` / ``err_ink`` / ``err_line`` — VARCHAR(7)
  NULL (NULL = ``#2d0a0a`` / ``#fca5a5`` / ``#ef4444`` — exact);
* ``ui_settings.accent_bg`` / ``accent_ink`` / ``accent_line`` —
  VARCHAR(7) NULL (NULL = ``#2b2110`` / ``#fbbf24`` / ``#f59e0b`` —
  exact).

EIGHT additive, fully reversible columns on the single-row table (A13);
no server defaults (the row is created only by the PUT upsert, house
rule).
"""
from __future__ import annotations

import sqlalchemy as sa

from alembic import op

revision = "0016"
down_revision = "0015"
branch_labels = None
depends_on = None

#: The 8 semantic columns (name, built-in the NULL means) — upgrade
#: adds them in this order, downgrade drops them in reverse.
_SEMANTIC_COLUMNS: tuple[str, ...] = (
    "ok_bg", "ok_ink",
    "err_bg", "err_ink", "err_line",
    "accent_bg", "accent_ink", "accent_line",
)


def upgrade() -> None:
    for name in _SEMANTIC_COLUMNS:
        op.add_column(
            "ui_settings", sa.Column(name, sa.String(length=7), nullable=True)
        )


def downgrade() -> None:
    # Safe order: the 8 columns are the only 0016 artefacts — dropping
    # them (reverse order, for symmetry) leaves 0015's schema
    # byte-identical (A13, fully reversible).
    for name in reversed(_SEMANTIC_COLUMNS):
        op.drop_column("ui_settings", name)