Ai Citation

1"use client";
2 
3import { cn } from "@/lib/utils";
4import { ArrowUpRight, Globe } from "lucide-react";
5import { AnimatePresence, motion, useReducedMotion } from "motion/react";
6import { type ReactNode, useEffect, useRef, useState } from "react";
7 
8const SPRING_DEFAULT = {
9  bounce: 0.1,
10  duration: 0.25,
11  type: "spring" as const,
12};
13/** Grace period so the pointer can cross the gap between pill and card. */
14const CLOSE_DELAY_MS = 120;
15const CARD_WIDTH_PX = 288;
16 
17export type AICitationProps = {
18  className?: string;
19  /** Excerpt or description shown in the card. */
20  description?: string;
21  /**
22   * The source's mark for the card header — a real isotype or an `<img>`.
23   *
24   * A node rather than a URL so a brand's own SVG can be passed straight in.
25   */
26  favicon?: ReactNode;
27  /** The number or short label shown in the pill. */
28  label: string | number;
29  title: string;
30  url: string;
31};
32 
33const hostOf = (url: string): string => {
34  try {
35    return new URL(url).hostname.replace(/^www\./, "");
36  } catch {
37    return url;
38  }
39};
40 
41/**
42 * An inline citation that can be peeked at.
43 *
44 * The card scales up **from the pill** rather than fading in centred: with a
45 * transform origin at the bottom of the marker, the growth points back at what
46 * was clicked, so the pointer never loses the thread. It opens on hover and on
47 * focus, and closes on Escape — a hover-only preview is unreachable by keyboard
48 * and unusable on touch.
49 */
50const AICitation = ({
51  className,
52  description,
53  favicon,
54  label,
55  title,
56  url,
57}: AICitationProps) => {
58  const shouldReduceMotion = useReducedMotion();
59  const [isOpen, setIsOpen] = useState(false);
60  const closeTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
61 
62  const open = () => {
63    if (closeTimeoutRef.current) {
64      clearTimeout(closeTimeoutRef.current);
65      closeTimeoutRef.current = null;
66    }
67    setIsOpen(true);
68  };
69 
70  const scheduleClose = () => {
71    closeTimeoutRef.current = setTimeout(
72      () => setIsOpen(false),
73      CLOSE_DELAY_MS
74    );
75  };
76 
77  useEffect(
78    () => () => {
79      if (closeTimeoutRef.current) {
80        clearTimeout(closeTimeoutRef.current);
81      }
82    },
83    []
84  );
85 
86  useEffect(() => {
87    if (!isOpen) {
88      return;
89    }
90    const handle = (event: KeyboardEvent) => {
91      if (event.key === "Escape") {
92        setIsOpen(false);
93      }
94    };
95    window.addEventListener("keydown", handle);
96    return () => window.removeEventListener("keydown", handle);
97// … truncated