component Timeline {
  outputs {
    select(payload: { sourceEvent?: Event; [key: string]: string | number | boolean | null | object })
  }

  props {
    size: string = "default"
    color: string = "primary"
    title: string = "Timeline"
    description: string = ""
    items: unknown[] = []
    variant: string = "default"
    numbered: boolean = false
    class: string = ""
  }

  functions {
    // Explicit status wins; otherwise the item flagged current is "current"
    // and everything after it is "upcoming".
    shared function statusOf(item, index, currentIndex) {
      if (item.status) { return item.status }
      if (item.current) { return "current" }
      currentIndex = -1
      for (var position = 0; position < items.length; position++) {
        if (currentIndex < 0 && items[position] && items[position].current) { currentIndex = position }
      }
      if (currentIndex >= 0 && index > currentIndex) { return "upcoming" }
      return "default"
    }
  }

  view {
    <section
      data-ui-component="Timeline"
      aria-label='{title}'
      class='wrn-timeline {class}'
      data-size='{size}'
      data-color='{color}'
      data-variant='{variant}'
    >
      {#if title || description}
        <header class="wrn-timeline__header">
          {#if title}
            <h3 class="wrn-timeline__title">{title}</h3>
          {/if}
          {#if description}
            <p class="wrn-timeline__description">{description}</p>
          {/if}
        </header>
      {/if}

      <ol class="wrn-timeline__list">
        {#each items as item, index}
          <li
            class="wrn-timeline__item"
            data-status='{statusOf(item, index)}'
            data-interactive='{item.href ? "true" : "false"}'
            @click='output.select({ item: item, index: index })'
          >
            <span
              class="wrn-timeline__marker"
              data-status='{statusOf(item, index)}'
            >
              {#if numbered}
                <span class="wrn-timeline__number" aria-hidden="true">{index + 1}</span>
              {:else}
                <span class='{item.icon || "icon-[lucide--circle-check]"}' aria-hidden="true"></span>
              {/if}
            </span>

            <article
              class="wrn-timeline__card"
              data-variant='{variant}'
            >
              <div class="wrn-timeline__card-header">
                <div>
                  <!--
                    Items sit under this component's own title when it has one.
                    Without that title they are the first heading here, so they
                    take its level instead of skipping one and leaving a gap in
                    the page's heading order.
                  -->
                  {#if title}
                    <h4 class="wrn-timeline__item-title">{item.title || item.label}</h4>
                  {:else}
                    <h3 class="wrn-timeline__item-title">{item.title || item.label}</h3>
                  {/if}
                  {#if item.subtitle}
                    <p class="wrn-timeline__subtitle">{item.subtitle}</p>
                  {/if}
                </div>
                {#if item.date || item.time || item.meta}
                  <time class="wrn-timeline__time">{item.date || item.time || item.meta}</time>
                {/if}
              </div>

              {#if item.description}
                <p class="wrn-timeline__copy">{item.description}</p>
              {/if}

              {#if item.href}
                <a href='{item.href}' class="wrn-timeline__action">
                  <span>{item.actionLabel || "View details"}</span>
                  <span class="icon-[lucide--arrow-right] wrn-timeline__action-icon" aria-hidden="true"></span>
                </a>
              {/if}
            </article>
          </li>
        {:empty}
          <li class="wrn-timeline__empty">No timeline items available.</li>
        {/each}
      </ol>

      <slot></slot>
    </section>
  }

  style {
    .wrn-timeline { --wrn-timeline-accent: var(--wrn-color-primary); width: 100%; min-width: 0; color: var(--wrn-color-text); }
    .wrn-timeline[data-color="success"] { --wrn-timeline-accent: var(--wrn-color-success); }
    .wrn-timeline[data-color="info"] { --wrn-timeline-accent: var(--wrn-color-info); }
    .wrn-timeline__header { margin-bottom: 1.5rem; }
    .wrn-timeline__title {
      color: var(--wrn-color-text);
      font-size: 1.25rem;
      font-weight: 650;
      letter-spacing: -0.02em;
    }
    .wrn-timeline__description { max-width: 42rem; margin-top: 0.5rem; color: var(--wrn-color-text-muted); line-height: 1.75rem; }
    .wrn-timeline__list { position: relative; display: grid; gap: 1rem; margin: 0; padding: 0 0 0 3rem; list-style: none; }
    .wrn-timeline__list::before {
      position: absolute;
      inset-block: 1rem;
      inset-inline-start: 0.9375rem;
      width: 2px;
      border-radius: 999px;
      background: var(--wrn-color-border);
      content: "";
    }
    .wrn-timeline__item { position: relative; min-width: 0; }
    .wrn-timeline__item:last-child { padding-bottom: 0; }
    .wrn-timeline__marker {
      position: absolute;
      z-index: 1;
      top: 1.125rem;
      inset-inline-start: -3rem;
      display: flex;
      width: 2rem;
      height: 2rem;
      align-items: center;
      justify-content: center;
      border: 3px solid var(--wrn-color-bg);
      border-radius: 50%;
      color: var(--wrn-color-on-primary);
      background: var(--wrn-timeline-accent);
      box-shadow: 0 0 0 1px color-mix(in srgb, var(--wrn-timeline-accent) 40%, var(--wrn-color-border)), var(--wrn-highlight-edge, none);
    }
    .wrn-timeline__marker:is([data-status="complete"], [data-status="success"]) { background: var(--wrn-color-success); }
    .wrn-timeline__marker:is([data-status="warning"], [data-status="pending"]) { background: var(--wrn-color-warning); }
    .wrn-timeline__marker:is([data-status="danger"], [data-status="failed"]) { background: var(--wrn-color-danger); }
    .wrn-timeline__number {
      font-family: var(--wrn-font-mono, monospace);
      font-size: 0.72rem;
      font-weight: 650;
    }
    .wrn-timeline__card {
      min-width: 0;
      padding: 1.125rem 1.25rem;
      border: 1px solid var(--wrn-color-border);
      border-radius: var(--wrn-radius);
      background: var(--wrn-color-surface-raised);
      box-shadow: var(--wrn-shadow-1);
      transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
    }
    .wrn-timeline__item[data-interactive="true"] { cursor: pointer; }
    .wrn-timeline__item[data-interactive="true"]:hover .wrn-timeline__card {
      border-color: var(--wrn-color-border-strong, var(--wrn-color-border));
      transform: translateY(-1px);
      box-shadow: var(--wrn-shadow-2);
    }
    .wrn-timeline__card[data-variant="minimal"] { padding: 0; border-color: transparent; background: transparent; box-shadow: none; }
    .wrn-timeline__card-header { display: flex; flex-direction: column; gap: 0.5rem; }
    .wrn-timeline__item-title {
      color: var(--wrn-color-text);
      font-weight: 620;
      letter-spacing: -0.01em;
    }
    .wrn-timeline__subtitle {
      margin-top: 0.125rem;
      color: var(--wrn-color-primary-text, var(--wrn-color-primary));
      font-size: 0.8125rem;
      font-weight: 550;
    }
    .wrn-timeline__time {
      flex: none;
      color: var(--wrn-color-text-subtle, var(--wrn-color-text-muted));
      font-family: var(--wrn-font-mono, monospace);
      font-size: 0.72rem;
      font-variant-numeric: tabular-nums;
    }
    .wrn-timeline__copy { margin-top: 0.75rem; color: var(--wrn-color-text-muted); font-size: 0.875rem; line-height: 1.5rem; }
    .wrn-timeline__action {
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      margin-top: 0.875rem;
      color: var(--wrn-color-primary-text, var(--wrn-color-primary));
      font-size: 0.8125rem;
      font-weight: 600;
    }
    .wrn-timeline__action:hover { color: var(--wrn-color-primary-hover); }
    .wrn-timeline__action-icon { width: 1rem; height: 1rem; }
    .wrn-timeline__empty { padding-left: 2rem; color: var(--wrn-color-text-muted); font-size: 0.875rem; }
    @media (min-width: 40rem) {
      .wrn-timeline__card-header { flex-direction: row; align-items: flex-start; justify-content: space-between; }
    }
    @media (max-width: 39.99rem) {
      .wrn-timeline__list { padding-inline-start: 2.5rem; }
      .wrn-timeline__list::before { inset-inline-start: 0.75rem; }
      .wrn-timeline__marker { inset-inline-start: -2.5rem; }
      .wrn-timeline__card { padding: 1rem; }
    }

    /* --- Status: current rings and pulses, upcoming goes hollow ------------ */
    .wrn-timeline__marker[data-status="current"] {
      box-shadow: 0 0 0 1px var(--wrn-timeline-accent), 0 0 0 5px color-mix(in srgb, var(--wrn-timeline-accent) 20%, transparent);
      animation: wrn-timeline-pulse 2.2s ease-in-out infinite;
    }
    .wrn-timeline__marker[data-status="upcoming"] {
      color: var(--wrn-color-text-subtle, var(--wrn-color-text-muted));
      background: var(--wrn-color-surface);
      box-shadow: inset 0 0 0 1.5px var(--wrn-color-border-strong, var(--wrn-color-border));
    }
    .wrn-timeline__item[data-status="current"] .wrn-timeline__card {
      border-color: color-mix(in srgb, var(--wrn-timeline-accent) 45%, var(--wrn-color-border));
      box-shadow: 0 0 0 3px color-mix(in srgb, var(--wrn-timeline-accent) 10%, transparent), var(--wrn-shadow-1);
    }
    .wrn-timeline__item[data-status="upcoming"] .wrn-timeline__card { opacity: 0.72; }
    .wrn-timeline__item[data-status="upcoming"] .wrn-timeline__item-title { color: var(--wrn-color-text-muted); }
    @keyframes wrn-timeline-pulse {
      50% { box-shadow: 0 0 0 1px var(--wrn-timeline-accent), 0 0 0 8px color-mix(in srgb, var(--wrn-timeline-accent) 6%, transparent); }
    }

    /* --- Card variants ----------------------------------------------------- */
    .wrn-timeline[data-variant="soft"] .wrn-timeline__card {
      border-color: transparent;
      background: color-mix(in srgb, var(--wrn-timeline-accent) 5%, var(--wrn-color-surface-soft, var(--wrn-color-surface)));
      box-shadow: none;
    }
    .wrn-timeline[data-variant="raised"] .wrn-timeline__card {
      border-color: var(--wrn-color-border);
      box-shadow: var(--wrn-highlight-edge, none), var(--wrn-shadow-2);
    }
    .wrn-timeline[data-variant="outline"] .wrn-timeline__card {
      background: transparent;
      border-style: dashed;
      box-shadow: none;
    }

    /* Compact: a dense dot rail with the time inline, for drawers and panels. */
    .wrn-timeline[data-variant="compact"] .wrn-timeline__list { gap: 0; padding-inline-start: 1.75rem; }
    .wrn-timeline[data-variant="compact"] .wrn-timeline__list::before { inset-block: 0.5rem; inset-inline-start: 0.4375rem; width: 1px; }
    .wrn-timeline[data-variant="compact"] .wrn-timeline__marker {
      top: 0.625rem; inset-inline-start: -1.75rem; width: 0.875rem; height: 0.875rem; border-width: 2px;
      box-shadow: 0 0 0 1px color-mix(in srgb, var(--wrn-timeline-accent) 40%, var(--wrn-color-border));
    }
    .wrn-timeline[data-variant="compact"] .wrn-timeline__marker > * { display: none; }
    .wrn-timeline[data-variant="compact"] .wrn-timeline__card {
      padding: 0.4rem 0 0.9rem; border: 0; border-radius: 0; background: transparent; box-shadow: none;
    }
    .wrn-timeline[data-variant="compact"] .wrn-timeline__card-header { flex-direction: row; align-items: baseline; justify-content: space-between; }
    .wrn-timeline[data-variant="compact"] .wrn-timeline__item-title { font-size: 0.875rem; font-weight: 550; }
    .wrn-timeline[data-variant="compact"] .wrn-timeline__copy { margin-top: 0.125rem; font-size: 0.8125rem; }

    /* Alternate: a centred spine with cards alternating sides once the
       timeline itself is wide enough (container query, not viewport). */
    .wrn-timeline[data-variant="alternate"] { container: wrn-timeline / inline-size; }
    @container wrn-timeline (min-width: 40rem) {
      .wrn-timeline[data-variant="alternate"] .wrn-timeline__list { padding-inline-start: 0; gap: 1.5rem; }
      .wrn-timeline[data-variant="alternate"] .wrn-timeline__list::before { inset-inline-start: calc(50% - 1px); }
      .wrn-timeline[data-variant="alternate"] .wrn-timeline__item { width: calc(50% - 2rem); }
      .wrn-timeline[data-variant="alternate"] .wrn-timeline__item:nth-of-type(even) { margin-inline-start: auto; }
      .wrn-timeline[data-variant="alternate"] .wrn-timeline__item:nth-of-type(odd) .wrn-timeline__marker { inset-inline-start: auto; inset-inline-end: -3rem; }
      .wrn-timeline[data-variant="alternate"] .wrn-timeline__item:nth-of-type(even) .wrn-timeline__marker { inset-inline-start: -3rem; }
      .wrn-timeline[data-variant="alternate"] .wrn-timeline__item:nth-of-type(odd) .wrn-timeline__card { text-align: end; }
      .wrn-timeline[data-variant="alternate"] .wrn-timeline__item:nth-of-type(odd) .wrn-timeline__card-header { flex-direction: row-reverse; }
    }

    /* --- Sizes --------------------------------------------------------------- */
    .wrn-timeline[data-size="sm"] .wrn-timeline__title { font-size: 1rem; }
    .wrn-timeline[data-size="sm"] .wrn-timeline__card { padding: 0.75rem 0.875rem; }
    .wrn-timeline[data-size="sm"] .wrn-timeline__item-title { font-size: 0.875rem; }
    .wrn-timeline[data-size="sm"] .wrn-timeline__list { gap: 0.625rem; }
    .wrn-timeline[data-size="lg"] .wrn-timeline__title { font-size: 1.5rem; }
    .wrn-timeline[data-size="lg"] .wrn-timeline__card { padding: 1.375rem 1.5rem; }
    .wrn-timeline[data-size="lg"] .wrn-timeline__item-title { font-size: 1.0625rem; }
    .wrn-timeline[data-size="lg"] .wrn-timeline__list { gap: 1.25rem; }

    @media (prefers-reduced-motion: reduce) {
      .wrn-timeline__marker[data-status="current"] { animation: none; }
    }
  }
}