Playground parameters

"use client";import * as React from "react";import { ChevronDown, Info, RotateCcw, SlidersHorizontal, X } from "lucide-react";import { Input } from "@/components/ui/input";import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip";import { cn } from "@/lib/utils";// The playground's parameters: a floating panel (title, a count of what changed, Reset and close) whose groups of// parameters scroll under soft fades, with a "More" pill while there is more below. Each group is one soft gray box// ruled between rows; each row is the name at the left with its control at the right (a switch, a select, a number),// the description under it at full width, and free-text fields below that. While a request runs the fields go inert// and say so on hover, rather than the panel closing and the page shifting. It appears and goes at once; Escape closes// it unless a menu or dialog is open over the page.const FIELD = "h-8 rounded-control border-0 bg-wash-control px-3 text-body-sm text-fg shadow-none outline-none transition-colors duration-150 hover:bg-wash-selected focus-visible:shadow-none focus-visible:ring-2 focus-visible:ring-focus-ring";const ROW_ICON_BUTTON = "flex size-4 shrink-0 items-center justify-center rounded-tag text-fg-subtle outline-none transition-colors duration-150 hover:text-fg focus-visible:ring-2 focus-visible:ring-focus-ring";// Long option labels wrap inside the narrow panel instead of pushing the control past its edge.const CONTROL = "min-w-0 [&>*]:max-w-full";function isOverlayOpen() {  return Array.from(document.querySelectorAll('[role="dialog"]:not([data-slot="playground-parameters"]), [role="menu"], [role="listbox"]')).some((layer) => !layer.closest('[inert], [aria-hidden="true"]'));}/** The count of changed parameters: a small brand dot that rides beside "Parameters". */function ParametersChangedCount({ count }: { count: number }) {  return <span className="grid size-4 shrink-0 place-items-center rounded-pill bg-brand text-counter text-on-brand tabular-nums">{count}</span>;}/** The composer's toggle: pressed while the panel is open, with the changed count riding along so edits show when it's closed. */function ParametersButton({ open, onToggle, modifiedCount = 0, className }: { open: boolean; onToggle: () => void; modifiedCount?: number; className?: string }) {  return (    <button      type="button"      onClick={onToggle}      aria-pressed={open}      aria-label={modifiedCount > 0 ? `Parameters, ${modifiedCount} changed` : "Parameters"}      className={cn(        "flex h-8 shrink-0 items-center gap-1.5 rounded-control px-3 text-body-sm outline-none transition-colors duration-150 focus-visible:ring-2 focus-visible:ring-focus-ring",        open ? "bg-wash-control text-fg" : "text-fg-muted hover:bg-wash-hover hover:text-fg",        className,      )}    >      <SlidersHorizontal className="size-3.5" strokeWidth={1.5} />      <span className="max-sm:hidden">Parameters</span>      {modifiedCount > 0 && <ParametersChangedCount count={modifiedCount} />}    </button>  );}/** Pointer cover over the fields while a request runs, with a label that follows the cursor. Keyboard is cut off by `inert`. */function FetchingOverlay() {  const labelRef = React.useRef<HTMLSpanElement>(null);  return (    <div      aria-hidden      className="absolute inset-0 z-20 cursor-not-allowed"      onMouseMove={(e) => {        const label = labelRef.current;        if (!label) return;        const box = e.currentTarget.getBoundingClientRect();        const x = Math.min(e.clientX - box.left + 14, box.width - label.offsetWidth - 4);        const y = Math.min(e.clientY - box.top + 14, box.height - label.offsetHeight - 4);        label.style.transform = `translate(${Math.max(4, x)}px, ${Math.max(4, y)}px)`;        label.style.opacity = "1";      }}      onMouseLeave={() => {        if (labelRef.current) labelRef.current.style.opacity = "0";      }}    >      <span ref={labelRef} className="pointer-events-none absolute top-0 left-0 rounded-tag bg-primary px-2 py-1 text-caption whitespace-nowrap text-on-primary opacity-0 transition-opacity duration-150">        Uneditable while fetching      </span>    </div>  );}function ParametersScroller({ fetching, children }: { fetching: boolean; children: React.ReactNode }) {  const ref = React.useRef<HTMLDivElement>(null);  const [edges, setEdges] = React.useState({ above: false, below: false });  const measure = React.useCallback(() => {    const el = ref.current;    if (!el) return;    const above = el.scrollTop > 1;    const below = el.scrollTop + el.clientHeight < el.scrollHeight - 1;    setEdges((c) => (c.above === above && c.below === below ? c : { above, below }));  }, []);  React.useLayoutEffect(() => {    const el = ref.current;    if (!el) return;    measure();    const observer = new ResizeObserver(measure);    observer.observe(el);    for (const child of el.children) observer.observe(child);    return () => observer.disconnect();  }, [measure]);  return (    <div className="relative flex min-h-0 flex-1 flex-col">      <div        ref={ref}        onScroll={measure}        inert={fetching || undefined}        aria-busy={fetching}        className={cn("flex flex-1 flex-col gap-5 overflow-y-auto overscroll-contain px-4 pt-1 pb-4 transition-opacity duration-200 [scrollbar-width:none] [&::-webkit-scrollbar]:hidden", fetching && "opacity-50")}      >        {children}      </div>      <div aria-hidden className={cn("pointer-events-none absolute inset-x-0 top-0 h-5 bg-linear-to-b from-surface to-transparent transition-opacity duration-200", !edges.above && "opacity-0")} />      <div aria-hidden className={cn("pointer-events-none absolute inset-x-0 bottom-0 h-8 bg-linear-to-t from-surface to-transparent transition-opacity duration-200", !edges.below && "opacity-0")} />      {/* Pointer only: keyboard and screen reader users scroll the list itself. */}      <button        type="button"        tabIndex={-1}        aria-hidden        onClick={() => ref.current?.scrollBy({ top: ref.current.clientHeight * 0.8, behavior: "smooth" })}        className={cn(          "absolute bottom-2 left-1/2 flex h-6 -translate-x-1/2 items-center gap-1 rounded-pill bg-surface pr-2 pl-2.5 text-caption text-fg-muted shadow-card transition-[opacity,color,scale] duration-150 ease-out hover:text-fg active:scale-[0.97] motion-reduce:active:scale-100",          (!edges.below || fetching) && "pointer-events-none opacity-0",        )}      >        More        <ChevronDown className="size-3.5" strokeWidth={1.5} />      </button>      {fetching && <FetchingOverlay />}    </div>  );}/** The panel. Place it yourself (the playground docks it 28px off the window's right edge, 320px wide, level with the title). */function PlaygroundParameters({  title = "Parameters",  open,  onOpenChange,  modifiedCount = 0,  onReset,  fetching = false,  className,  children,}: {  title?: string;  open: boolean;  onOpenChange: (open: boolean) => void;  modifiedCount?: number;  onReset?: () => void;  /** While true the fields stay in place but can't be edited. */  fetching?: boolean;  className?: string;  children: React.ReactNode;}) {  const closeOnEscape = React.useEffectEvent(() => onOpenChange(false));  React.useEffect(() => {    if (!open) return;    const onKey = (e: KeyboardEvent) => {      if (e.key === "Escape" && !e.shiftKey && !isOverlayOpen()) closeOnEscape();    };    window.addEventListener("keydown", onKey, true);    return () => window.removeEventListener("keydown", onKey, true);  }, [open]);  if (!open) return null;  return (    <aside data-slot="playground-parameters" aria-label={title} className={cn("flex w-(--ds-layout-parameters) flex-col overflow-hidden rounded-card bg-surface shadow-card", className)}>      <div className="mt-2 flex h-(--ds-layout-parameters-header) shrink-0 items-center gap-1.5 pr-2.5 pl-7">        <h2 className="text-body font-normal tracking-normal text-fg">{title}</h2>        {modifiedCount > 0 && (          <Tooltip>            <TooltipTrigger asChild>              <span>                <ParametersChangedCount count={modifiedCount} />              </span>            </TooltipTrigger>            <TooltipContent side="top">{modifiedCount} changed</TooltipContent>          </Tooltip>        )}        <span className="ml-auto flex items-center gap-1">          {modifiedCount > 0 && onReset && (            <button              type="button"              onClick={onReset}              disabled={fetching}              className="flex h-6 items-center gap-1.5 rounded-tag px-2.5 text-caption text-fg-subtle outline-none transition-colors duration-150 hover:bg-wash-hover hover:text-fg focus-visible:ring-2 focus-visible:ring-focus-ring disabled:opacity-50"            >              <RotateCcw className="size-3.5" strokeWidth={1.5} />              Reset            </button>          )}          <button            type="button"            onClick={() => onOpenChange(false)}            aria-label={`Close ${title.toLowerCase()}`}            className="grid size-7 place-items-center rounded-tag text-fg-subtle outline-none transition-colors duration-150 hover:bg-wash-control hover:text-fg focus-visible:ring-2 focus-visible:ring-focus-ring"          >            <X className="size-3.5" strokeWidth={1.5} />          </button>        </span>      </div>      <ParametersScroller fetching={fetching}>{children}</ParametersScroller>    </aside>  );}/** A section: a caption header (a step darker than the descriptions), then its rows together in one gray box. */function ParameterGroup({ title, count, className, children }: { title: React.ReactNode; count?: React.ReactNode; className?: string; children: React.ReactNode }) {  return (    <section data-slot="parameter-group" className="flex w-full min-w-0 flex-col">      <h3 className="mb-2 flex flex-wrap items-baseline gap-2 px-3 text-caption font-medium tracking-normal text-fg-muted">        {title}        {count !== undefined && <span className="font-normal text-fg-subtle tabular-nums">{count}</span>}      </h3>      <div className={cn("divide-y divide-line overflow-hidden rounded-card bg-neutral-5 [&>*]:px-3", className)}>{children}</div>    </section>  );}/** One parameter. `stacked` puts the control under the description at full width (free text); `onReset` adds a reset icon. */function ParameterRow({  label,  description,  help,  stacked = false,  onReset,  labelAction,  children,}: {  label: string;  description?: React.ReactNode;  /** A longer note behind an info icon. */  help?: React.ReactNode;  stacked?: boolean;  onReset?: () => void;  labelAction?: React.ReactNode;  children: React.ReactNode;}) {  const labelId = React.useId();  const descriptionId = React.useId();  return (    <div role="group" aria-labelledby={labelId} aria-describedby={description ? descriptionId : undefined} className="min-w-0 py-3">      <div className="flex min-w-0 items-center justify-between gap-4">        <span className="inline-flex min-w-0 flex-1 flex-wrap items-center gap-x-1.5 gap-y-1 text-body-sm text-fg">          <span id={labelId} className="min-w-0 [overflow-wrap:anywhere]">            {label}          </span>          {help && (            <Popover>              <PopoverTrigger asChild>                <button type="button" aria-label={`About ${label}`} className={ROW_ICON_BUTTON}>                  <Info className="size-3" />                </button>              </PopoverTrigger>              <PopoverContent align="start" collisionPadding={12} className="w-auto max-w-[calc(100vw-1.5rem)] [overflow-wrap:anywhere]">                {help}              </PopoverContent>            </Popover>          )}          {labelAction}          {onReset && (            <button type="button" onClick={onReset} aria-label={`Reset ${label} to default`} title="Reset to default" className={ROW_ICON_BUTTON}>              <RotateCcw className="size-3" />            </button>          )}        </span>        {!stacked && <div className={cn(CONTROL, "flex max-w-[55%] shrink-0 justify-end")}>{children}</div>}      </div>      {description && (        <p id={descriptionId} className="mt-0.5 text-body-sm leading-field text-fg-muted [overflow-wrap:anywhere]">          {description}        </p>      )}      {stacked && <div className={cn(CONTROL, "mt-2 w-full [&>input]:h-9")}>{children}</div>}    </div>  );}/** The panel's filled gray field: no border, a darker gray on hover. */function ParameterInput({ className, type = "text", ...props }: React.ComponentProps<"input">) {  return (    <Input      type={type}      className={cn(        FIELD,        "w-28 max-w-full min-w-0 py-0 placeholder:text-fg-subtle",        type === "number" && "tabular-nums [appearance:textfield] [&::-webkit-inner-spin-button]:appearance-none [&::-webkit-outer-spin-button]:appearance-none",        className,      )}      {...props}    />  );}/** A number with its unit after it (ms, pages) inside the same gray field. */function ParameterUnitInput({ unit, className, ...props }: React.ComponentProps<"input"> & { unit: string }) {  return (    <div className={cn("flex h-8 w-28 max-w-full min-w-0 items-center rounded-control bg-wash-control px-3 transition-colors duration-150 hover:bg-wash-selected", className)}>      <ParameterInput type="number" className="h-auto min-w-0 flex-1 rounded-none bg-transparent p-0 hover:bg-transparent focus-visible:ring-0" {...props} />      <span className="ml-1 shrink-0 text-caption text-fg-subtle lowercase">{unit}</span>    </div>  );}/** The panel's filled gray select. */function ParameterSelect<T extends string>({ value, onValueChange, options, label, className }: { value: T; onValueChange: (value: T) => void; options: readonly { value: T; label: string }[]; label: string; className?: string }) {  return (    <Select value={value} onValueChange={(next) => onValueChange(next as T)}>      <SelectTrigger aria-label={label} className={cn(FIELD, "w-auto max-w-48 min-w-28 justify-between py-1.5 pr-2.5 pl-3 [&>span]:min-w-0 [&>span]:truncate", className)}>        <SelectValue />      </SelectTrigger>      <SelectContent align="end" className="w-auto">        {options.map((o) => (          <SelectItem key={o.value} value={o.value}>            {o.label}          </SelectItem>        ))}      </SelectContent>    </Select>  );}export { ParameterGroup, ParameterInput, ParameterRow, ParametersButton, ParametersChangedCount, ParameterSelect, ParameterUnitInput, PlaygroundParameters };