Conversation Thread

"use client";import { useEffect, useRef, useState } from "react";import {  ConversationThread,  ConversationThreadCitation,  ConversationThreadComposer,  ConversationThreadDescription,  ConversationThreadHeader,  ConversationThreadLog,  ConversationThreadMain,  ConversationThreadMessage,  ConversationThreadSource,  ConversationThreadSourceLink,  ConversationThreadSourceList,  ConversationThreadSourceMeta,  ConversationThreadSources,  ConversationThreadSourcesTitle,  ConversationThreadStatus,  ConversationThreadTitle,  type ConversationThreadVariant,} from "@/components/uai/conversation-thread";import {  CitationExcerpt,  CitationLink,  CitationPopover,  CitationSource,  CitationTitle,  CitationTrigger,} from "@/components/ui/uai/citation";import {  MessageActions,  MessageAuthor,  MessageAvatar,  MessageBody,  MessageContent,  MessageCopy,  MessageHeader,  MessageTime,} from "@/components/ui/uai/message";import {  PromptComposerActions,  PromptComposerInput,  PromptComposerSubmit,} from "@/components/ui/uai/prompt-composer";import {  ResponseStatusActions,  ResponseStatusDetail,  ResponseStatusIndicator,  ResponseStatusLabel,  ResponseStatusRetry,  ResponseStatusStop,  type ResponseStatusValue,} from "@/components/ui/uai/response-status";type Turn = { id: number; from: "user" | "assistant"; text: string; time: string };const sources = [  {    index: 1,    title: "Release 4.2 support review",    meta: "Support Ops · Sep 18",    excerpt: "Ticket volume rose 31% in the two weeks after 4.2, led by invoice export questions.",  },  {    index: 2,    title: "Invoice export changelog",    meta: "Product docs · Sep 4",    excerpt: "Exports now default to the workspace currency instead of the customer currency.",  },];const reply =  "Most of the follow-up tickets came from teams in the EU and UK. Exports now default to the workspace currency, so customers billing in euros saw totals in dollars. A banner on the export screen and a currency setting in the export dialog would cover the largest group.";function CitedReply() {  return (    <>      Most of the follow-up tickets came from teams in the EU and UK      <SourceCitation index={1} />. Exports now default to the workspace currency, so customers      billing in euros saw totals in dollars      <SourceCitation index={2} />. A banner on the export screen and a currency setting in the      export dialog would cover the largest group.    </>  );}function SourceCitation({ index }: { index: number }) {  const source = sources[index - 1];  if (!source) return null;  return (    <ConversationThreadCitation index={index}>      <CitationTrigger />      <CitationPopover>        <CitationSource>{source.meta}</CitationSource>        <CitationTitle>{source.title}</CitationTitle>        <CitationExcerpt>{source.excerpt}</CitationExcerpt>        <CitationLink href="#sources">Open document</CitationLink>      </CitationPopover>    </ConversationThreadCitation>  );}export function ConversationThreadPreview({  variant = "chat",}: {  variant?: ConversationThreadVariant;}) {  const [turns, setTurns] = useState<Turn[]>([    {      id: 1,      from: "user",      text: "Why did support tickets jump after the 4.2 release?",      time: "09:41",    },    { id: 2, from: "assistant", text: reply, time: "09:41" },  ]);  const [streamed, setStreamed] = useState(reply.length);  const [status, setStatus] = useState<ResponseStatusValue>("complete");  const timers = useRef<number[]>([]);  const nextId = useRef(3);  const clearTimers = () => {    for (const timer of timers.current) window.clearTimeout(timer);    timers.current = [];  };  useEffect(    () => () => {      for (const timer of timers.current) window.clearTimeout(timer);    },    [],  );  // Simulates a streamed reply locally. Applications connect their own transport.  const respond = () => {    clearTimers();    setStatus("queued");    setStreamed(0);    const words = reply.split(" ");    timers.current.push(      window.setTimeout(() => {        setStatus("streaming");        words.forEach((_, index) => {          timers.current.push(            window.setTimeout(() => {              setStreamed(words.slice(0, index + 1).join(" ").length);              if (index === words.length - 1) setStatus("complete");            }, index * 45),          );        });      }, 500),    );  };  const streaming = status === "queued" || status === "streaming";  const latest = turns[turns.length - 1]?.id;  return (    <ConversationThread variant={variant}>      <ConversationThreadHeader>        <ConversationThreadTitle>Support volume after 4.2</ConversationThreadTitle>        <ConversationThreadDescription>          Answers cite the support review and the product changelog.        </ConversationThreadDescription>      </ConversationThreadHeader>      <ConversationThreadMain>        <ConversationThreadLog>          {turns.map((turn) => {            const live = turn.id === latest && turn.from === "assistant";            return (              <ConversationThreadMessage                key={turn.id}                from={turn.from}                streaming={live && streaming}              >                <MessageAvatar />                <MessageBody>                  <MessageHeader>                    <MessageAuthor>                      {turn.from === "assistant" ? "Ledger assistant" : "You"}                    </MessageAuthor>                    <MessageTime dateTime={`2026-09-30T${turn.time}`}>{turn.time}</MessageTime>                  </MessageHeader>                  <MessageContent>                    {turn.from === "user" ? (                      turn.text                    ) : live && status !== "complete" ? (                      reply.slice(0, streamed)                    ) : (                      <CitedReply />                    )}                  </MessageContent>                  {turn.from === "assistant" ? (                    <MessageActions>                      <MessageCopy text={reply} />                    </MessageActions>                  ) : null}                </MessageBody>              </ConversationThreadMessage>            );          })}        </ConversationThreadLog>        <ConversationThreadStatus status={status}>          <ResponseStatusIndicator />          <ResponseStatusLabel />          {status === "complete" ? <ResponseStatusDetail>2 sources</ResponseStatusDetail> : null}          <ResponseStatusActions>            <ResponseStatusStop              onClick={() => {                clearTimers();                setStatus("stopped");              }}            />            <ResponseStatusRetry onClick={respond} />          </ResponseStatusActions>        </ConversationThreadStatus>        <ConversationThreadComposer          busy={streaming}          onSubmit={(prompt) => {            setTurns((current) => [              ...current.slice(-4),              { id: nextId.current++, from: "user", text: prompt, time: "09:44" },              { id: nextId.current++, from: "assistant", text: reply, time: "09:44" },            ]);            respond();          }}        >          <PromptComposerInput placeholder="Ask a follow-up…" />          <PromptComposerActions>            <PromptComposerSubmit />          </PromptComposerActions>        </ConversationThreadComposer>      </ConversationThreadMain>      <ConversationThreadSources id="sources">        <ConversationThreadSourcesTitle>Sources</ConversationThreadSourcesTitle>        <ConversationThreadSourceList>          {sources.map((source) => (            <ConversationThreadSource key={source.index} index={source.index}>              <ConversationThreadSourceLink href="#sources">                {source.title}              </ConversationThreadSourceLink>              <ConversationThreadSourceMeta>{source.meta}</ConversationThreadSourceMeta>            </ConversationThreadSource>          ))}        </ConversationThreadSourceList>      </ConversationThreadSources>    </ConversationThread>  );}