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/* Reset scoped to the graphic. A bare `*` rule in light DOM would also restyle
 * the renderer's page and every other graphic on it; :where() keeps the
 * specificity at zero, same as the bare selector it replaces. */
:where(.quote-root, .quote-root *),
:where(.quote-root, .quote-root *)::before,
:where(.quote-root, .quote-root *)::after { margin: 0; padding: 0; box-sizing: border-box; }

/* The graphic's own root. `position: absolute; inset: 0` fills whatever box the
 * renderer hands us: in an iframe mount that is the frame, and inside a shadow
 * root or a positioned container it is that container. `position: fixed` would
 * escape to the browser viewport in the second case. The package never styles
 * `body` — the renderer owns the document, not the graphic. */
.quote-root {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.quote {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
}

.quote.visible {
  opacity: 1;
  transition: opacity 0.8s ease;
}

.quote.visible .quote-text {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease 0.3s, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.3s;
}

.quote.visible .quote-line {
  transform: scaleX(1);
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.4s;
}

.quote.visible .quote-attr {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease 0.5s, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.5s;
}

.quote-text {
  font-family: 'Instrument Serif', serif;
  font-size: 48px;
  line-height: 1.3;
  color: white;
  font-style: italic;
  opacity: 0;
  transform: translateY(20px);
}

/**
 * The step a playAction() lands on, exactly as the spec defines it: `goto`
 * wins; otherwise the current step (-1 before the first play) plus `delta`,
 * which defaults to 1. A target at or past stepCount means "go to the end",
 * returned as undefined — so a second play on a one-step graphic takes it off
 * air instead of replaying it.
 */
function resolveTargetStep(currentStep, { goto, delta } = {}, stepCount = 1) {
  const target = Number.isInteger(goto) && goto >= 0
    ? goto
    : (currentStep ?? -1) + (Number.isInteger(delta) ? delta : 1);
  return target >= stepCount ? undefined : Math.max(target, 0);
}

// Each action takes the next revision number. Anything that finishes after a
// newer action has started checks it and backs off, so play → stop → play
// sent without waiting ends on air instead of hidden by the stale stop.
async playAction({ goto, delta, skipAnimation } = {}) {
  this._initDom();
  const target = resolveTargetStep(this._step, { goto, delta });
  if (target === undefined) {
    await this.stopAction({ skipAnimation });
    return { statusCode: 200, currentStep: undefined };
  }
  ++this._rev;
  this._step = target;
  this._root.classList.remove('out');
  if (skipAnimation) {
    this._root.classList.add('instant', 'visible');
    return { statusCode: 200, currentStep: this._step };
  }
  this._root.classList.remove('instant');
  // Force a reflow so the browser registers the starting state.
  void this._root.offsetWidth;
  this._root.classList.add('visible');
  await sleep(1300);
  return { statusCode: 200, currentStep: this._step };
}

async stopAction({ skipAnimation } = {}) {
  this._initDom();
  const rev = ++this._rev;
  this._step = undefined;
  if (skipAnimation) {
    this._root.classList.add('instant');
    this._root.classList.remove('visible', 'out');
    return { statusCode: 200 };
  }
  this._root.classList.remove('instant');
  this._root.classList.add('out');
  await sleep(500);
  if (rev === this._rev) this._root.classList.remove('visible', 'out');
  return { statusCode: 200 };
}

{
  "$schema": "https://ograf.ebu.io/v1/specification/json-schemas/graphics/schema.json",
  "id": "dev.ograf.tutorial.quote",
  "version": "1.0.0",
  "name": "Full Page Quote",
  "description": "Cinematic full-screen quote card with staggered reveal of text, divider, and attribution. Tutorial from ograf.dev.",
  "author": {
    "name": "ograf.dev",
    "url": "https://ograf.dev"
  },
  "main": "graphic.mjs",
  "stepCount": 1,
  "supportsRealTime": true,
  "supportsNonRealTime": false,
  "thumbnails": [
    {
      "file": "thumbnail.webp",
      "resolution": {
        "width": 1920,
        "height": 1080
      }
    }
  ],
  "schema": {
    "type": "object",
    "properties": {
      "text": {
        "type": "string",
        "title": "Quote",
        "gddType": "multi-line",
        "default": "Open graphics, open broadcast, open standards. That's the future."
      },
      "author": {
        "type": "string",
        "title": "Author",
        "gddType": "single-line",
        "default": "Demo Quote"
      },
      "role": {
        "type": "string",
        "title": "Role",
        "gddType": "single-line",
        "default": "Sample Credit"
      }
    }
  }
}