Disclosure

// Pseudocode walkthrough of the Foldkit integration points. Each labeled
// block below is an excerpt. Fit them into your own Model, init, Message,
// update, and view definitions.
import { Schema } from 'effect'
import type { HtmlBuilder } from 'foldkit/html'
import { defineMessageUnion } from 'foldkit/message'
import { evo } from 'foldkit/struct'

import { Disclosure } from '@foldkit/ui'

// Store the open state as a plain boolean field in your Model:
const Model = Schema.Struct({
  isFaqOpen: Schema.Boolean,
  // ...your other fields
})

// In your init function, start it closed:
const init = () => ({
  model: {
    isFaqOpen: false,
    // ...your other fields
  },
})

// A verb-first, past-tense Message carries the new open state:

const Message = defineMessageUnion({
  ToggledFaq: { isOpen: Schema.Boolean },
})

// In the corresponding Message.match handler, store the value.
// This is the moment to persist the open state, lazy-load panel content, or
// log analytics.
ToggledFaq: ({ isOpen }) => ({ model: evo(model, { isFaqOpen: () => isOpen }) })

// Inside your view function, render the disclosure with Disclosure.view.
// Render the panel unconditionally and pass it through animatePanel: the
// panel stays mounted while collapsed, so the height transition animates the
// open and close. The toggle text below names the button. When the toggle is
// icon-only, give it a name with `ariaLabel`, or point `ariaLabelledBy` at a
// visible label element (target the toggle id with
// `Disclosure.buttonId('faq-1')` for a native `<label for>`). Either
// attribute is only emitted when provided, so the toggle never carries a
// dangling `aria-labelledby`.
const view = (model, h: HtmlBuilder<Message>) =>
  Disclosure.view(
    {
      id: 'faq-1',
      isOpen: model.isFaqOpen,
      onToggle: isOpen => Message.ToggledFaq({ isOpen }),
      // ariaLabel: 'What is Foldkit?',
      toView: ({ button, panel, animatePanel }) =>
        h.div(
          [h.Class('border rounded-lg overflow-hidden')],
          [
            h.button(
              [
                ...button,
                h.Class('flex items-center justify-between w-full p-4'),
              ],
              [h.span([], ['What is Foldkit?'])],
            ),
            animatePanel(
              h.div(
                [...panel, h.Class('p-4 border-t')],
                [h.p([], ['A functional UI framework built on Effect-TS.'])],
              ),
            ),
          ],
        ),
    },
    h,
  )