Code Block

// Shared motion tokens. Easing curves mirror the CSS custom properties in
// globals.css; springs are the canonical physics used across components.
// Strong custom variants — defaults like `ease-in`/`ease-out` feel weak.

export const EASE_OUT = [0.16, 1, 0.3, 1] as const;
export const EASE_IN_OUT = [0.77, 0, 0.175, 1] as const;
export const EASE_DRAWER = [0.32, 0.72, 0, 1] as const;

/** CSS string form of EASE_OUT for inline style transitions. */
export const EASE_OUT_CSS = "cubic-bezier(0.16, 1, 0.3, 1)";

/** Press feedback on buttons and other tappable surfaces. */
export const SPRING_PRESS = {
  type: "spring",
  stiffness: 500,
  damping: 30,
  mass: 0.6,
} as const;

/** Content swaps — label/icon slots trading places inside a control. */
export const SPRING_SWAP = {
  type: "spring",
  stiffness: 460,
  damping: 30,
  mass: 0.55,
} as const;

/** Overlay panel entrances — modals and sheets summoned by pointer. */
export const SPRING_PANEL = {
  type: "spring",
  stiffness: 420,
  damping: 40,
  mass: 0.5,
} as const;

/** Shared-layout glides — pills, indicators and panels morphing between positions. */
export const SPRING_LAYOUT = {
  type: "spring",
  stiffness: 360,
  damping: 32,
  mass: 0.6,
} as const;

/** Cursor-follow physics for decorative mouse tracking (magnetic, tilt, dock). */
export const SPRING_MOUSE = {
  stiffness: 200,
  damping: 15,
  mass: 0.3,
} as const;

/** Dragged handles and fills (sliders) — critically damped `useSpring` config,
 * so the value follows the pointer butterily and never rebounds off an end. */
export const SPRING_GLIDE = {
  stiffness: 700,
  damping: 50,
  mass: 0.5,
} as const;

import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

"use client";
// beui.dev/components/agents/code-block

import { Check, Copy, FileCode2, LoaderCircle } from "lucide-react";
import { motion, useReducedMotion } from "motion/react";
import {
  type ReactNode,
  useCallback,
  useEffect,
  useLayoutEffect,
  useMemo,
  useRef,
  useState,
} from "react";
import {
  type AgentCodeLanguage,
  AgentCodeLine,
  useAgentCodeTokens,
} from "@/components/agents/agent-code";
import { SPRING_PRESS } from "@/lib/ease";
import { cn } from "@/lib/utils";

export type CodeBlockStatus = "streaming" | "complete";

export interface CodeBlockProps {
  code: string;
  language?: AgentCodeLanguage;
  filename?: ReactNode;
  status?: CodeBlockStatus;
  showLineNumbers?: boolean;
  highlightLines?: number[];
  maxHeight?: number;
  wrap?: boolean;
  copyable?: boolean;
  onCopy?: () => void | Promise<void>;
  className?: string;
}

export function CodeBlock({
  code,
  language = "typescript",
  filename,
  status = "complete",
  showLineNumbers = true,
  highlightLines = [],
  maxHeight = 280,
  wrap = false,
  copyable = true,
  onCopy,
  className,
}: CodeBlockProps) {
  const reduce = useReducedMotion() ?? false;
  const viewportRef = useRef<HTMLDivElement>(null);
  const copyTimer = useRef<number | undefined>(undefined);
  const [copied, setCopied] = useState(false);
  const streaming = status === "streaming";
  const tokens = useAgentCodeTokens(code, language);
  const highlighted = useMemo(
    () => new Set(highlightLines),
    [highlightLines],
  );
  let offset = 0;
  const lines = code.split("\n").map((content) => {
    const line = { content, offset };
    offset += content.length + 1;
    return line;
  });

  useEffect(
    () => () => {
      if (copyTimer.current) window.clearTimeout(copyTimer.current);
    },
    [],
  );

  useLayoutEffect(() => {
    const viewport = viewportRef.current;
    if (!viewport || !streaming) return;

    const frame = requestAnimationFrame(() => {
      if (viewport.scrollHeight <= viewport.clientHeight) return;
      if (typeof viewport.scrollTo === "function") {
        viewport.scrollTo({
          top: viewport.scrollHeight,
          behavior: reduce ? "auto" : "smooth",
        });
      } else {
        viewport.scrollTop = viewport.scrollHeight;
      }
    });
    return () => cancelAnimationFrame(frame);
  });

  const handleCopy = useCallback(async () => {
    if (onCopy) await onCopy();
    else await navigator.clipboard?.writeText(code);

    setCopied(true);
    if (copyTimer.current) window.clearTimeout(copyTimer.current);
    copyTimer.current = window.setTimeout(() => setCopied(false), 1600);
  }, [code, onCopy]);

  return (
    <div
      data-state={status}
      aria-busy={streaming}
      className={cn(
        "w-full overflow-hidden rounded-2xl bg-muted/80 text-sm",
        className,
      )}
    >
      <div className="flex h-10 items-center gap-2.5 px-3">
        <FileCode2
          aria-hidden="true"
          className="size-3.5 shrink-0 text-muted-foreground/70"
        />
        {filename ? (
          <span className="min-w-0 truncate font-mono text-xs text-foreground/80">
            {filename}
          </span>
        ) : null}
        <span className="text-[10px] font-medium uppercase tracking-wide text-muted-foreground/55">
          {language}
        </span>
        <span
          className={cn(
            "ml-auto inline-flex shrink-0 items-center gap-1 text-[10px] font-medium",
            streaming
              ? "text-blue-600 dark:text-blue-400"
              : "text-emerald-600 dark:text-emerald-400",
          )}
        >
          {streaming ? (
            <LoaderCircle className={cn("size-3", !reduce && "animate-spin")} />
          ) : (
            <Check className="size-3" />
          )}
          {streaming ? "Writing" : "Ready"}
        </span>
        {copyable || onCopy ? (
          <motion.button
            type="button"
            aria-label={copied ? "Copied" : "Copy code"}
            title={copied ? "Copied" : "Copy code"}
            onClick={handleCopy}
            whileTap={reduce ? undefined : { scale: 0.9 }}
            transition={SPRING_PRESS}
            className="grid size-7 shrink-0 place-items-center rounded-full text-muted-foreground outline-none transition-colors hover:bg-background/70 hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring"
          >
            {copied ? (
              <Check className="size-3.5" />
            ) : (
              <Copy className="size-3.5" />
            )}
          </motion.button>
        ) : null}
      </div>

      <div
        ref={viewportRef}
        role={streaming ? "log" : undefined}
        aria-live={streaming ? "polite" : undefined}
        className="scrollbar-hide overflow-auto border-t border-foreground/[0.06] py-2"
        style={{ maxHeight }}
      >
        <pre className="m-0 min-w-max font-mono text-xs leading-5 text-foreground/85">
          <code>
            {lines.map((line, index) => {
              const lineNumber = index + 1;
              return (
                <span
                  key={line.offset}
                  className={cn(
                    "grid min-h-5",
                    showLineNumbers
                      ? "grid-cols-[2.75rem_minmax(0,1fr)]"
                      : "grid-cols-1",
                    highlighted.has(lineNumber) && "bg-blue-500/[0.07]",
                  )}
                >
                  {showLineNumbers ? (
                    <span className="select-none pr-3 text-right tabular-nums text-muted-foreground/35">
                      {lineNumber}
                    </span>
                  ) : null}
                  <AgentCodeLine
                    code={line.content}
                    tokens={tokens?.[index]}
                    className={cn(
                      "pr-4",
                      showLineNumbers ? "pl-1" : "pl-4",
                      wrap ? "whitespace-pre-wrap break-words" : "whitespace-pre",
                    )}
                  />
                </span>
              );
            })}
          </code>
        </pre>
      </div>
    </div>
  );
}

"use client";

import {
  type CSSProperties,
  Fragment,
  useEffect,
  useState,
} from "react";
import { createHighlighter, type Highlighter } from "shiki";
import { cn } from "@/lib/utils";

export type AgentCodeLanguage =
  | "bash"
  | "diff"
  | "json"
  | "text"
  | "tsx"
  | "typescript";

export interface AgentCodeToken {
  content: string;
  offset: number;
  light?: string;
  dark?: string;
}

export type AgentCodeTokenLines = AgentCodeToken[][];

export interface AgentCodeProps {
  code: string;
  language?: AgentCodeLanguage;
  className?: string;
}

export interface AgentCodeLineProps {
  code: string;
  tokens?: AgentCodeToken[];
  className?: string;
}

const LIGHT_THEME = "github-light-high-contrast";
const DARK_THEME = "github-dark-high-contrast";
let agentCodeHighlighter: Promise<Highlighter> | null = null;
const tokenCache = new Map<string, AgentCodeTokenLines>();

function getAgentCodeHighlighter() {
  if (!agentCodeHighlighter) {
    agentCodeHighlighter = createHighlighter({
      themes: [LIGHT_THEME, DARK_THEME],
      langs: ["bash", "diff", "json", "tsx", "typescript"],
    });
  }
  return agentCodeHighlighter;
}

function tokenCacheKey(code: string, language: AgentCodeLanguage) {
  return `${language}\u0000${code}`;
}

export function useAgentCodeTokens(
  code: string,
  language: AgentCodeLanguage,
) {
  const key = tokenCacheKey(code, language);
  const cached = tokenCache.get(key);
  const [result, setResult] = useState<{
    key: string;
    code: string;
    language: AgentCodeLanguage;
    lines: AgentCodeTokenLines;
  } | null>(cached ? { key, code, language, lines: cached } : null);

  useEffect(() => {
    const current = tokenCache.get(key);
    if (current) {
      setResult({ key, code, language, lines: current });
      return;
    }

    let cancelled = false;
    getAgentCodeHighlighter().then((highlighter) => {
      if (cancelled) return;
      const lines = highlighter
        .codeToTokensWithThemes(code, {
          lang: language,
          themes: {
            light: LIGHT_THEME,
            dark: DARK_THEME,
          },
        })
        .map((line) =>
          line.map((token) => ({
            content: token.content,
            offset: token.offset,
            light: token.variants.light?.color,
            dark: token.variants.dark?.color,
          })),
      );
      tokenCache.set(key, lines);
      setResult({ key, code, language, lines });
    });
    return () => {
      cancelled = true;
    };
  }, [code, key, language]);

  if (result?.key === key) return result.lines;
  if (result?.language === language && code.startsWith(result.code)) {
    return result.lines;
  }
  return null;
}

export function AgentCodeLine({
  code,
  tokens,
  className,
}: AgentCodeLineProps) {
  return (
    <span className={className}>
      {tokens
        ? tokens.map((token) => (
            <span
              key={`${token.offset}-${token.content}`}
              style={
                {
                  "--agent-code-light": token.light ?? "currentColor",
                  "--agent-code-dark": token.dark ?? token.light ?? "currentColor",
                } as CSSProperties
              }
              className="text-[var(--agent-code-light)] dark:text-[var(--agent-code-dark)]"
            >
              {token.content}
            </span>
          ))
        : code}
    </span>
  );
}

export function AgentCode({
  code,
  language = "bash",
  className,
}: AgentCodeProps) {
  const tokens = useAgentCodeTokens(code, language);
  let offset = 0;
  const lines = code.split("\n").map((content) => {
    const line = { content, offset };
    offset += content.length + 1;
    return line;
  });

  return (
    <pre
      className={cn(
        "m-0 overflow-x-auto whitespace-pre font-mono text-xs leading-5 text-foreground/85",
        className,
      )}
    >
      <code>
        {lines.map((line, index) => (
          <Fragment key={line.offset}>
            <AgentCodeLine code={line.content} tokens={tokens?.[index]} />
            {index < lines.length - 1 ? "\n" : null}
          </Fragment>
        ))}
      </code>
    </pre>
  );
}