import { Meta, Canvas } from '@storybook/addon-docs/blocks';
import * as AlertStories from '../src/ui/alert/alert.stories';
import * as FormFieldStories from '../src/ui/form-field/form-field.stories';

<Meta title="Foundations/Accessibility" />

# Accessibility

No single tool catches every a11y class of bug, so this repo layers four, each catching
what the ones below/above it can't.

## The layers

1. **Axe on every story** — `@storybook/addon-a11y` in the panel, plus
   `@storybook/test-runner` + `axe-playwright` gating CI (`npm run test-storybook:ci`).
   Catches structural/contrast/ARIA-shape violations on every component, automatically,
   as soon as a story exists. Escape hatch: `parameters: { a11y: { disable: true } }`,
   only with an inline justification comment + a cross-reference to the WP that will fix
   it (see e.g. `task-list.stories.ts`).
2. **Template a11y lint** — `angular-eslint`'s `templateAccessibility` config
   (`alt-text`, `label-has-associated-control`, `click`/`mouse-events-have-key-events`,
   `interactive-supports-focus`, `valid-aria`, `no-autofocus`, …) running on every inline
   template via `angular.processInlineTemplates` (this repo has no `.html` files — every
   template is a string in the `@Component` decorator; the processor extracts each one
   into a virtual file the template rules can lint). Catches missing alt text, unlabelled
   controls, and interactive elements that can't be reached by keyboard — at lint time,
   before a story even exists.
3. **Play tests** — Storybook stories assert the wiring axe/lint can't see:
   `form-field.stories.ts`'s canonical composition asserts `aria-describedby` joins
   `-desc`/`-error` in the right order; `alert.stories.ts` asserts `role="alert"` for
   errors vs `role="status"` for info/ok/warning. These run as part of the same
   `test-storybook:ci` gate as the axe checks, so a regression fails CI, not just a panel.
4. **Manual WCAG checklist** (`docs/reference/wcag-checklist.md`) — what none of the above can see:
   tab order across a whole page, focus traps, 200%-zoom reflow, and how a real screen
   reader narrates a flow. A living per-page checklist, not a one-time audit — it already
   caught a real bug (a dashboard alert overflowing at 320px) that no automated layer here
   would have flagged.

## Component wiring this protects

<Canvas of={FormFieldStories.WithDescriptionAndError} />

The description (`-desc`) and error (`-error`) ids are joined in a pinned order so a
screen reader announces the hint, then the error, never neither. See
`text-input.component.ts`'s `describedBy()`.

<Canvas of={AlertStories.Error} />

Errors are `role="alert"` (assertive — interrupts, because the user needs to know
_now_); info/ok/warning stay `role="status"` (polite) so they don't interrupt whatever
the user is doing. See `alert.component.ts`.

## Route-change focus

Client-side routing has no page (re)load, so a screen reader/keyboard user's focus stays
wherever it was — usually the link they just clicked, now detached from any content that
matters. `shared/layout/route-focus.ts` moves focus to the new page's `<h1>` (every page
has exactly one via `page-shell`) on every navigation after the initial load, deferred via
`afterNextRender` so it doesn't race the view-transition DOM swap. Scroll position resets
the same way (`withInMemoryScrolling`), both wired once in `app.config.ts` — not per page.

## Where the skip register lives

`npm run lint` fails the build on a real template a11y violation, and `test-storybook:ci`
fails it on a real axe violation. Both can be locally disabled — the lint rule via a
normal ESLint disable comment, axe via `parameters: { a11y: { disable: true } }` — but
only with a comment naming _why_ and a cross-reference to the WP expected to remove the
skip (see `docs/project/backlog/WP-13-cibg-gap-register.md`'s marker convention, reused here).
Grep `a11y: { disable: true }` in `*.stories.ts` for the current list.