chore: merge with web UI project

web/src/app/_components/conversation-starter.tsx

@@ -0,0 +1,53 @@
+import { motion } from "framer-motion";
+
+import { cn } from "~/lib/utils";
+
+import { Welcome } from "./welcome";
+
+const questions = [
+  "How many times taller is the Eiffel Tower than the tallest building in the world?",
+  "How many years does an average Tesla battery last compared to a gasoline engine?",
+  "How many liters of water are required to produce 1 kg of beef?",
+  "How many times faster is the speed of light compared to the speed of sound?",
+];
+export function ConversationStarter({
+  className,
+  onSend,
+}: {
+  className?: string;
+  onSend?: (message: string) => void;
+}) {
+  return (
+    <div className={cn("flex flex-col items-center", className)}>
+      <div className="pointer-events-none fixed inset-0 flex items-center justify-center">
+        <Welcome className="pointer-events-auto mb-15 w-[75%] -translate-y-24" />
+      </div>
+      <ul className="flex flex-wrap">
+        {questions.map((question, index) => (
+          <motion.li
+            key={question}
+            className="flex w-1/2 shrink-0 p-2 active:scale-105"
+            style={{ transition: "all 0.2s ease-out" }}
+            initial={{ opacity: 0, y: 24 }}
+            animate={{ opacity: 1, y: 0 }}
+            exit={{ opacity: 0, y: -20 }}
+            transition={{
+              duration: 0.2,
+              delay: index * 0.1 + 0.5,
+              ease: "easeOut",
+            }}
+          >
+            <div
+              className="cursor-pointer rounded-2xl border bg-[rgba(255,255,255,0.5)] px-4 py-4 text-gray-500 transition-all duration-300 hover:bg-[rgba(255,255,255,1)] hover:text-gray-900 hover:shadow-md"
+              onClick={() => {
+                onSend?.(question);
+              }}
+            >
+              {question}
+            </div>
+          </motion.li>
+        ))}
+      </ul>
+    </div>
+  );
+}

web/src/app/_components/fav-icon.tsx

@@ -0,0 +1,15 @@
+export function FavIcon({ url, title }: { url: string; title?: string }) {
+  return (
+    <img
+      className="h-4 w-4 rounded-full bg-slate-100 shadow-sm"
+      width={16}
+      height={16}
+      src={new URL(url).origin + "/favicon.ico"}
+      alt={title}
+      onError={(e) => {
+        e.currentTarget.src =
+          "https://perishablepress.com/wp/wp-content/images/2021/favicon-standard.png";
+      }}
+    />
+  );
+}

web/src/app/_components/input-box.tsx

@@ -0,0 +1,167 @@
+import { ArrowUpOutlined, CloseOutlined } from "@ant-design/icons";
+import { AnimatePresence, motion } from "framer-motion";
+import {
+  type KeyboardEvent,
+  useCallback,
+  useEffect,
+  useRef,
+  useState,
+} from "react";
+
+import { Button } from "~/components/ui/button";
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipTrigger,
+} from "~/components/ui/tooltip";
+import type { Option } from "~/core/messages";
+import { cn } from "~/lib/utils";
+
+export function InputBox({
+  className,
+  size,
+  responding,
+  feedback,
+  onSend,
+  onCancel,
+  onRemoveFeedback,
+}: {
+  className?: string;
+  size?: "large" | "normal";
+  responding?: boolean;
+  feedback?: { option: Option } | null;
+  onSend?: (message: string, feedback: { option: Option } | null) => void;
+  onCancel?: () => void;
+  onRemoveFeedback?: () => void;
+}) {
+  const [message, setMessage] = useState("");
+  const [imeStatus, setImeStatus] = useState<"active" | "inactive">("inactive");
+  const [indent, setIndent] = useState(0);
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
+  const feedbackRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    if (feedback) {
+      setMessage("");
+
+      setTimeout(() => {
+        if (feedbackRef.current) {
+          setIndent(feedbackRef.current.offsetWidth);
+        }
+      }, 200);
+    }
+    setTimeout(() => {
+      textareaRef.current?.focus();
+    }, 0);
+  }, [feedback]);
+
+  const handleSendMessage = useCallback(() => {
+    if (responding) {
+      onCancel?.();
+    } else {
+      if (message.trim() === "") {
+        return;
+      }
+      if (onSend) {
+        onSend(message, feedback ?? null);
+        setMessage("");
+        onRemoveFeedback?.();
+      }
+    }
+  }, [responding, onCancel, message, onSend, feedback, onRemoveFeedback]);
+
+  const handleKeyDown = useCallback(
+    (event: KeyboardEvent<HTMLTextAreaElement>) => {
+      if (responding) {
+        return;
+      }
+      if (
+        event.key === "Enter" &&
+        !event.shiftKey &&
+        !event.metaKey &&
+        !event.ctrlKey &&
+        imeStatus === "inactive"
+      ) {
+        event.preventDefault();
+        handleSendMessage();
+      }
+    },
+    [responding, imeStatus, handleSendMessage],
+  );
+
+  return (
+    <div className={cn("relative rounded-[24px] border bg-white", className)}>
+      <div className="w-full">
+        <AnimatePresence>
+          {feedback && (
+            <motion.div
+              ref={feedbackRef}
+              className="absolute top-0 left-0 mt-3 ml-2 flex items-center justify-center gap-1 rounded-2xl border border-[#007aff] bg-white px-2 py-0.5"
+              initial={{ opacity: 0, scale: 0 }}
+              animate={{ opacity: 1, scale: 1 }}
+              exit={{ opacity: 0, scale: 0 }}
+              transition={{ duration: 0.2, ease: "easeInOut" }}
+            >
+              <div className="flex h-full w-full items-center justify-center text-sm text-[#007aff] opacity-90">
+                {feedback.option.text}
+              </div>
+              <CloseOutlined
+                className="cursor-pointer text-[9px]"
+                onClick={onRemoveFeedback}
+              />
+            </motion.div>
+          )}
+        </AnimatePresence>
+        <textarea
+          ref={textareaRef}
+          className={cn(
+            "m-0 w-full resize-none border-none px-4 py-3 text-lg",
+            size === "large" ? "min-h-32" : "min-h-4",
+          )}
+          style={{ textIndent: feedback ? `${indent}px` : 0 }}
+          placeholder={
+            feedback
+              ? `Describe how you ${feedback.option.text.toLocaleLowerCase()}?`
+              : "What can I do for you?"
+          }
+          value={message}
+          onCompositionStart={() => setImeStatus("active")}
+          onCompositionEnd={() => setImeStatus("inactive")}
+          onKeyDown={handleKeyDown}
+          onChange={(event) => {
+            setMessage(event.target.value);
+          }}
+        />
+      </div>
+      <div className="flex items-center px-4 py-2">
+        <div className="flex grow"></div>
+        <div className="flex shrink-0 items-center gap-2">
+          <Tooltip>
+            <TooltipTrigger asChild>
+              <Button
+                variant="outline"
+                size="icon"
+                className={cn(
+                  "h-10 w-10 rounded-full",
+                  responding ? "bg-button-hover" : "bg-button",
+                )}
+                onClick={handleSendMessage}
+              >
+                {responding ? (
+                  <div className="flex h-10 w-10 items-center justify-center">
+                    <div className="h-4 w-4 rounded-sm bg-red-300" />
+                  </div>
+                ) : (
+                  <ArrowUpOutlined />
+                )}
+              </Button>
+            </TooltipTrigger>
+            <TooltipContent>
+              <p>{responding ? "Stop" : "Send"}</p>
+            </TooltipContent>
+          </Tooltip>
+        </div>
+      </div>
+    </div>
+  );
+}

web/src/app/_components/loading-animation.module.css

@@ -0,0 +1,34 @@
+@keyframes bouncing-animation {
+  to {
+    opacity: 0.1;
+    transform: translateY(-8px);
+  }
+}
+
+.loadingAnimation {
+  display: flex;
+}
+
+.loadingAnimation > div {
+  width: 8px;
+  height: 8px;
+  margin: 2px 4px;
+  border-radius: 50%;
+  background-color: #a3a1a1;
+  opacity: 1;
+  animation: bouncing-animation 0.5s infinite alternate;
+}
+
+.loadingAnimation.sm > div {
+  width: 6px;
+  height: 6px;
+  margin: 1px 2px;
+}
+
+.loadingAnimation > div:nth-child(2) {
+  animation-delay: 0.2s;
+}
+
+.loadingAnimation > div:nth-child(3) {
+  animation-delay: 0.4s;
+}

web/src/app/_components/loading-animation.tsx

@@ -0,0 +1,25 @@
+import { cn } from "~/lib/utils";
+
+import styles from "./loading-animation.module.css";
+
+export function LoadingAnimation({
+  className,
+  size = "normal",
+}: {
+  className?: string;
+  size?: "normal" | "sm";
+}) {
+  return (
+    <div
+      className={cn(
+        styles.loadingAnimation,
+        size === "sm" && styles.sm,
+        className,
+      )}
+    >
+      <div></div>
+      <div></div>
+      <div></div>
+    </div>
+  );
+}

web/src/app/_components/logo.tsx

@@ -0,0 +1,20 @@
+import { useState } from "react";
+
+import { Markdown } from "./markdown";
+
+export function Logo() {
+  const [text, setText] = useState("🦌 Deer");
+  return (
+    <a
+      className="text-sm opacity-70 transition-opacity duration-300 hover:opacity-100"
+      target="_blank"
+      href="https://github.com/bytedance/deer"
+      onMouseEnter={() =>
+        setText("🦌 **D**eep **E**xploration and **E**fficient **R**esearch")
+      }
+      onMouseLeave={() => setText("🦌 Deer")}
+    >
+      <Markdown animate>{text}</Markdown>
+    </a>
+  );
+}

web/src/app/_components/markdown.tsx

@@ -0,0 +1,124 @@
+import { CheckOutlined, CopyOutlined } from "@ant-design/icons";
+import { useMemo, useState } from "react";
+import ReactMarkdown, {
+  type Options as ReactMarkdownOptions,
+} from "react-markdown";
+import rehypeKatex from "rehype-katex";
+import remarkGfm from "remark-gfm";
+import remarkMath from "remark-math";
+import "katex/dist/katex.min.css";
+
+import { Button } from "~/components/ui/button";
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipTrigger,
+} from "~/components/ui/tooltip";
+import { rehypeSplitWordsIntoSpans } from "~/core/rehype";
+import { cn } from "~/lib/utils";
+
+export function Markdown({
+  className,
+  children,
+  style,
+  enableCopy,
+  animate = false,
+  ...props
+}: ReactMarkdownOptions & {
+  className?: string;
+  enableCopy?: boolean;
+  style?: React.CSSProperties;
+  animate?: boolean;
+}) {
+  const rehypePlugins = useMemo(() => {
+    if (animate) {
+      return [rehypeKatex, rehypeSplitWordsIntoSpans];
+    }
+    return [rehypeKatex];
+  }, [animate]);
+  return (
+    <div
+      className={cn(className, "markdown flex flex-col gap-4")}
+      style={style}
+    >
+      <ReactMarkdown
+        remarkPlugins={[remarkGfm, remarkMath]}
+        rehypePlugins={rehypePlugins}
+        components={{
+          a: ({ href, children }) => (
+            <a href={href} target="_blank" rel="noopener noreferrer">
+              {children}
+            </a>
+          ),
+        }}
+        {...props}
+      >
+        {dropMarkdownQuote(processKatexInMarkdown(children))}
+      </ReactMarkdown>
+      {enableCopy && typeof children === "string" && (
+        <div className="flex">
+          <CopyButton content={children} />
+        </div>
+      )}
+    </div>
+  );
+}
+
+function CopyButton({ content }: { content: string }) {
+  const [copied, setCopied] = useState(false);
+  return (
+    <Tooltip>
+      <TooltipTrigger asChild>
+        <Button
+          variant="outline"
+          size="sm"
+          className="rounded-full"
+          onClick={async () => {
+            try {
+              await navigator.clipboard.writeText(content);
+              setCopied(true);
+              setTimeout(() => {
+                setCopied(false);
+              }, 1000);
+            } catch (error) {
+              console.error(error);
+            }
+          }}
+        >
+          {copied ? (
+            <CheckOutlined className="h-4 w-4" />
+          ) : (
+            <CopyOutlined className="h-4 w-4" />
+          )}{" "}
+        </Button>
+      </TooltipTrigger>
+      <TooltipContent>
+        <p>Copy</p>
+      </TooltipContent>
+    </Tooltip>
+  );
+}
+
+function processKatexInMarkdown(markdown?: string | null) {
+  if (!markdown) return markdown;
+
+  const markdownWithKatexSyntax = markdown
+    .replace(/\\\\\[/g, "$$$$") // Replace '\\[' with '$$'
+    .replace(/\\\\\]/g, "$$$$") // Replace '\\]' with '$$'
+    .replace(/\\\\\(/g, "$$$$") // Replace '\\(' with '$$'
+    .replace(/\\\\\)/g, "$$$$") // Replace '\\)' with '$$'
+    .replace(/\\\[/g, "$$$$") // Replace '\[' with '$$'
+    .replace(/\\\]/g, "$$$$") // Replace '\]' with '$$'
+    .replace(/\\\(/g, "$$$$") // Replace '\(' with '$$'
+    .replace(/\\\)/g, "$$$$"); // Replace '\)' with '$$';
+  return markdownWithKatexSyntax;
+}
+
+function dropMarkdownQuote(markdown?: string | null) {
+  if (!markdown) return markdown;
+  return markdown
+    .replace(/^```markdown\n/gm, "")
+    .replace(/^```text\n/gm, "")
+    .replace(/^```\n/gm, "")
+    .replace(/\n```$/gm, "");
+}

web/src/app/_components/message-list-view.tsx

@@ -0,0 +1,347 @@
+import { parse } from "best-effort-json-parser";
+import { motion } from "framer-motion";
+import { useCallback, useMemo } from "react";
+
+import { Button } from "~/components/ui/button";
+import {
+  Card,
+  CardContent,
+  CardFooter,
+  CardHeader,
+  CardTitle,
+} from "~/components/ui/card";
+import type { Message, Option } from "~/core/messages";
+import {
+  openResearch,
+  sendMessage,
+  useMessage,
+  useResearchTitle,
+  useStore,
+} from "~/core/store";
+import { cn } from "~/lib/utils";
+
+import { LoadingAnimation } from "./loading-animation";
+import { Markdown } from "./markdown";
+import { RainbowText } from "./rainbow-text";
+import { RollingText } from "./rolling-text";
+import { ScrollContainer } from "./scroll-container";
+
+export function MessageListView({
+  className,
+  onFeedback,
+}: {
+  className?: string;
+  onFeedback?: (feedback: { option: Option }) => void;
+}) {
+  const messageIds = useStore((state) => state.messageIds);
+  const interruptMessage = useStore((state) => {
+    if (messageIds.length >= 2) {
+      const lastMessage = state.messages.get(
+        messageIds[messageIds.length - 1]!,
+      );
+      return lastMessage?.finishReason === "interrupt" ? lastMessage : null;
+    }
+    return null;
+  });
+  const waitingForFeedbackMessageId = useStore((state) => {
+    if (messageIds.length >= 2) {
+      const lastMessage = state.messages.get(
+        messageIds[messageIds.length - 1]!,
+      );
+      if (lastMessage && lastMessage.finishReason === "interrupt") {
+        return state.messageIds[state.messageIds.length - 2];
+      }
+    }
+    return null;
+  });
+  const responding = useStore((state) => state.responding);
+  const noOngoingResearch = useStore(
+    (state) => state.ongoingResearchId === null,
+  );
+  const ongoingResearchIsOpen = useStore(
+    (state) => state.ongoingResearchId === state.openResearchId,
+  );
+
+  return (
+    <ScrollContainer
+      className={cn(
+        "flex h-full w-full flex-col overflow-y-auto pt-4",
+        className,
+      )}
+      scrollShadowColor="#f7f5f3"
+    >
+      <ul className="flex flex-col">
+        {messageIds.map((messageId) => (
+          <MessageListItem
+            key={messageId}
+            messageId={messageId}
+            waitForFeedback={waitingForFeedbackMessageId === messageId}
+            interruptMessage={interruptMessage}
+            onFeedback={onFeedback}
+          />
+        ))}
+        <div className="flex h-8 w-full shrink-0"></div>
+      </ul>
+      {responding && (noOngoingResearch || !ongoingResearchIsOpen) && (
+        <LoadingAnimation className="ml-4" />
+      )}
+    </ScrollContainer>
+  );
+}
+
+function MessageListItem({
+  className,
+  messageId,
+  waitForFeedback,
+  onFeedback,
+  interruptMessage,
+}: {
+  className?: string;
+  messageId: string;
+  waitForFeedback?: boolean;
+  onFeedback?: (feedback: { option: Option }) => void;
+  interruptMessage?: Message | null;
+}) {
+  const message = useMessage(messageId);
+  const startOfResearch = useStore((state) =>
+    state.researchIds.includes(messageId),
+  );
+  if (message) {
+    if (
+      message.role === "user" ||
+      message.agent === "coordinator" ||
+      message.agent === "planner" ||
+      startOfResearch
+    ) {
+      let content: React.ReactNode;
+      if (message.agent === "planner") {
+        content = (
+          <div className="w-full px-4">
+            <PlanCard
+              message={message}
+              waitForFeedback={waitForFeedback}
+              interruptMessage={interruptMessage}
+              onFeedback={onFeedback}
+            />
+          </div>
+        );
+      } else if (startOfResearch) {
+        content = (
+          <div className="w-full px-4">
+            <ResearchCard researchId={message.id} />
+          </div>
+        );
+      } else {
+        content = message.content ? (
+          <div
+            className={cn(
+              "flex w-full px-4",
+              message.role === "user" && "justify-end",
+              className,
+            )}
+          >
+            <MessageBubble message={message}>
+              <div className="flex w-full flex-col">
+                <Markdown
+                  animate={message.role !== "user" && message.isStreaming}
+                >
+                  {message?.content}
+                </Markdown>
+              </div>
+            </MessageBubble>
+          </div>
+        ) : null;
+      }
+      if (content) {
+        return (
+          <motion.li
+            className="mt-10"
+            key={messageId}
+            initial={{ opacity: 0, y: 24 }}
+            animate={{ opacity: 1, y: 0 }}
+            style={{ transition: "all 0.2s ease-out" }}
+            transition={{
+              duration: 0.2,
+              ease: "easeOut",
+            }}
+          >
+            {content}
+          </motion.li>
+        );
+      }
+    }
+    return null;
+  }
+
+  function MessageBubble({
+    className,
+    message,
+    children,
+  }: {
+    className?: string;
+    message: Message;
+    children: React.ReactNode;
+  }) {
+    return (
+      <div
+        className={cn(
+          `flex w-fit max-w-[85%] flex-col rounded-2xl px-4 py-3 shadow-xs`,
+          message.role === "user" &&
+            "text-primary-foreground rounded-ee-none bg-[#007aff]",
+          message.role === "assistant" && "rounded-es-none bg-white",
+          className,
+        )}
+      >
+        {children}
+      </div>
+    );
+  }
+
+  function ResearchCard({
+    className,
+    researchId,
+  }: {
+    className?: string;
+    researchId: string;
+  }) {
+    const reportId = useStore((state) =>
+      state.researchReportIds.get(researchId),
+    );
+    const hasReport = useStore((state) =>
+      state.researchReportIds.has(researchId),
+    );
+    const reportGenerating = useStore(
+      (state) => hasReport && state.messages.get(reportId!)!.isStreaming,
+    );
+    const openResearchId = useStore((state) => state.openResearchId);
+    const state = useMemo(() => {
+      if (hasReport) {
+        return reportGenerating ? "Generating report..." : "Report generated";
+      }
+      return "Researching...";
+    }, [hasReport, reportGenerating]);
+    const title = useResearchTitle(researchId);
+    const handleOpen = useCallback(() => {
+      if (openResearchId === researchId) {
+        openResearch(null);
+      } else {
+        openResearch(researchId);
+      }
+    }, [openResearchId, researchId]);
+    return (
+      <Card className={cn("w-full bg-white", className)}>
+        <CardHeader>
+          <CardTitle>
+            <RainbowText animated={state !== "Report generated"}>
+              {title !== undefined && title !== "" ? title : "Deep Research"}
+            </RainbowText>
+          </CardTitle>
+        </CardHeader>
+        <CardFooter>
+          <div className="flex w-full">
+            <RollingText className="flex-grow text-sm opacity-50">
+              {state}
+            </RollingText>
+            <Button onClick={handleOpen}>
+              {!openResearchId ? "Open" : "Close"}
+            </Button>
+          </div>
+        </CardFooter>
+      </Card>
+    );
+  }
+}
+
+const GREETINGS = ["Cool", "Sounds great", "Looks good", "Great", "Awesome"];
+function PlanCard({
+  className,
+  message,
+  interruptMessage,
+  onFeedback,
+  waitForFeedback,
+}: {
+  className?: string;
+  message: Message;
+  interruptMessage?: Message | null;
+  onFeedback?: (feedback: { option: Option }) => void;
+  waitForFeedback?: boolean;
+}) {
+  const plan = useMemo<{
+    title?: string;
+    thought?: string;
+    steps?: { title?: string; description?: string }[];
+  }>(() => {
+    return parse(message.content ?? "");
+  }, [message.content]);
+  const handleAccept = useCallback(async () => {
+    await sendMessage(
+      `${GREETINGS[Math.floor(Math.random() * GREETINGS.length)]}! ${Math.random() > 0.5 ? "Let's get started." : "Let's start."}`,
+      {
+        interruptFeedback: "accepted",
+      },
+    );
+  }, []);
+  return (
+    <Card className={cn("w-full bg-white", className)}>
+      <CardHeader>
+        <CardTitle>
+          <h1 className="text-xl font-medium">
+            <Markdown animate>
+              {plan.title !== undefined && plan.title !== ""
+                ? plan.title
+                : "Deep Research"}
+            </Markdown>
+          </h1>
+        </CardTitle>
+      </CardHeader>
+      <CardContent>
+        <Markdown className="opacity-80" animate>
+          {plan.thought}
+        </Markdown>
+        {plan.steps && (
+          <ul className="my-2 flex list-decimal flex-col gap-4 border-l-[2px] pl-8">
+            {plan.steps.map((step, i) => (
+              <li key={`step-${i}`}>
+                <h3 className="mb text-lg font-medium">
+                  <Markdown animate>{step.title}</Markdown>
+                </h3>
+                <div className="text-muted-foreground text-sm">
+                  <Markdown animate>{step.description}</Markdown>
+                </div>
+              </li>
+            ))}
+          </ul>
+        )}
+      </CardContent>
+      <CardFooter className="flex justify-end">
+        {!message.isStreaming && interruptMessage?.options?.length && (
+          <motion.div
+            className="flex gap-2"
+            initial={{ opacity: 0, y: 12 }}
+            animate={{ opacity: 1, y: 0 }}
+            transition={{ duration: 0.3, delay: 0.3 }}
+          >
+            {interruptMessage?.options.map((option) => (
+              <Button
+                key={option.value}
+                variant={option.value === "accepted" ? "default" : "outline"}
+                disabled={!waitForFeedback}
+                onClick={() => {
+                  if (option.value === "accepted") {
+                    void handleAccept();
+                  } else {
+                    onFeedback?.({
+                      option,
+                    });
+                  }
+                }}
+              >
+                {option.text}
+              </Button>
+            ))}
+          </motion.div>
+        )}
+      </CardFooter>
+    </Card>
+  );
+}

web/src/app/_components/messages-block.tsx

@@ -0,0 +1,70 @@
+import { useCallback, useRef, useState } from "react";
+
+import type { Option } from "~/core/messages";
+import { sendMessage, useStore } from "~/core/store";
+import { cn } from "~/lib/utils";
+
+import { ConversationStarter } from "./conversation-starter";
+import { InputBox } from "./input-box";
+import { MessageListView } from "./message-list-view";
+
+export function MessagesBlock({ className }: { className?: string }) {
+  const messageCount = useStore((state) => state.messageIds.length);
+  const responding = useStore((state) => state.responding);
+  const abortControllerRef = useRef<AbortController | null>(null);
+  const [feedback, setFeedback] = useState<{ option: Option } | null>(null);
+  const handleSend = useCallback(
+    async (message: string) => {
+      const abortController = new AbortController();
+      abortControllerRef.current = abortController;
+      try {
+        await sendMessage(
+          message,
+          {
+            maxPlanIterations: 1,
+            maxStepNum: 3,
+            interruptFeedback: feedback?.option.value,
+          },
+          {
+            abortSignal: abortController.signal,
+          },
+        );
+      } catch {}
+    },
+    [feedback],
+  );
+  const handleCancel = useCallback(() => {
+    abortControllerRef.current?.abort();
+    abortControllerRef.current = null;
+  }, []);
+  const handleFeedback = useCallback(
+    (feedback: { option: Option }) => {
+      setFeedback(feedback);
+    },
+    [setFeedback],
+  );
+  const handleRemoveFeedback = useCallback(() => {
+    setFeedback(null);
+  }, [setFeedback]);
+  return (
+    <div className={cn("flex h-full flex-col", className)}>
+      <MessageListView className="flex flex-grow" onFeedback={handleFeedback} />
+      <div className="relative flex h-42 shrink-0 pb-4">
+        {!responding && messageCount === 0 && (
+          <ConversationStarter
+            className="absolute top-[-218px] left-0"
+            onSend={handleSend}
+          />
+        )}
+        <InputBox
+          className="h-full w-full"
+          responding={responding}
+          feedback={feedback}
+          onSend={handleSend}
+          onCancel={handleCancel}
+          onRemoveFeedback={handleRemoveFeedback}
+        />
+      </div>
+    </div>
+  );
+}

web/src/app/_components/rainbow-text.module.css

@@ -0,0 +1,24 @@
+.animated {
+  background: linear-gradient(
+    to right,
+    rgba(0, 0, 0, 0.3) 15%,
+    rgba(0, 0, 0, 0.7) 35%,
+    rgba(0, 0, 0, 0.7) 65%,
+    rgba(0, 0, 0, 0.3) 85%
+  );
+  -webkit-background-clip: text;
+  background-clip: text;
+  -webkit-text-fill-color: transparent;
+  text-fill-color: transparent;
+  background-size: 500% auto;
+  animation: textShine 2s ease-in-out infinite alternate;
+}
+
+@keyframes textShine {
+  0% {
+    background-position: 0% 50%;
+  }
+  100% {
+    background-position: 100% 50%;
+  }
+}

web/src/app/_components/rainbow-text.tsx

@@ -0,0 +1,19 @@
+import { cn } from "~/lib/utils";
+
+import styles from "./rainbow-text.module.css";
+
+export function RainbowText({
+  animated,
+  className,
+  children,
+}: {
+  animated?: boolean;
+  className?: string;
+  children?: React.ReactNode;
+}) {
+  return (
+    <span className={cn(animated && styles.animated, className)}>
+      {children}
+    </span>
+  );
+}

web/src/app/_components/research-activities-block.tsx

@@ -0,0 +1,204 @@
+import {
+  BookOutlined,
+  PythonOutlined,
+  SearchOutlined,
+} from "@ant-design/icons";
+import { parse } from "best-effort-json-parser";
+import { motion } from "framer-motion";
+import { LRUCache } from "lru-cache";
+import { useMemo } from "react";
+import SyntaxHighlighter from "react-syntax-highlighter";
+import { docco } from "react-syntax-highlighter/dist/esm/styles/hljs";
+
+import type { ToolCallRuntime } from "~/core/messages";
+import { useMessage, useStore } from "~/core/store";
+import { cn } from "~/lib/utils";
+
+import { FavIcon } from "./fav-icon";
+import { LoadingAnimation } from "./loading-animation";
+import { Markdown } from "./markdown";
+import { RainbowText } from "./rainbow-text";
+
+export function ResearchActivitiesBlock({
+  className,
+  researchId,
+}: {
+  className?: string;
+  researchId: string;
+}) {
+  const activityIds = useStore((state) =>
+    state.researchActivityIds.get(researchId),
+  )!;
+  const ongoing = useStore((state) => state.ongoingResearchId === researchId);
+  return (
+    <>
+      <ul className={cn("flex flex-col py-4", className)}>
+        {activityIds.map(
+          (activityId, i) =>
+            i !== 0 && (
+              <motion.li
+                key={activityId}
+                style={{ transition: "all 0.4s ease-out" }}
+                initial={{ opacity: 0, y: 24 }}
+                animate={{ opacity: 1, y: 0 }}
+                transition={{
+                  duration: 0.4,
+                  ease: "easeOut",
+                }}
+              >
+                <ActivityMessage messageId={activityId} />
+                <ActivityListItem messageId={activityId} />
+                {i !== activityIds.length - 1 && <hr className="my-8" />}
+              </motion.li>
+            ),
+        )}
+      </ul>
+      {ongoing && <LoadingAnimation className="mx-4 my-12" />}
+    </>
+  );
+}
+
+function ActivityMessage({ messageId }: { messageId: string }) {
+  const message = useMessage(messageId);
+  if (message?.agent && message.content) {
+    if (message.agent !== "reporter" && message.agent !== "planner") {
+      return (
+        <div className="px-4 py-2">
+          <Markdown animate>{message.content}</Markdown>
+        </div>
+      );
+    }
+  }
+  return null;
+}
+
+function ActivityListItem({ messageId }: { messageId: string }) {
+  const message = useMessage(messageId);
+  if (message) {
+    if (!message.isStreaming && message.toolCalls?.length) {
+      for (const toolCall of message.toolCalls) {
+        if (toolCall.name === "web_search") {
+          return <WebSearchToolCall key={toolCall.id} toolCall={toolCall} />;
+        } else if (toolCall.name === "crawl_tool") {
+          return <CrawlToolCall key={toolCall.id} toolCall={toolCall} />;
+        } else if (toolCall.name === "python_repl_tool") {
+          return <PythonToolCall key={toolCall.id} toolCall={toolCall} />;
+        }
+      }
+    }
+  }
+  return null;
+}
+
+const __pageCache = new LRUCache<string, string>({ max: 100 });
+function WebSearchToolCall({ toolCall }: { toolCall: ToolCallRuntime }) {
+  const searchResults = useMemo<
+    { title: string; url: string; content: string }[]
+  >(() => {
+    let results: { title: string; url: string; content: string }[] | undefined =
+      undefined;
+    try {
+      results = toolCall.result ? parse(toolCall.result) : undefined;
+    } catch {
+      results = undefined;
+    }
+    if (Array.isArray(results)) {
+      results.forEach((result: { url: string; title: string }) => {
+        __pageCache.set(result.url, result.title);
+      });
+    } else {
+      results = [];
+    }
+    return results;
+  }, [toolCall.result]);
+  return (
+    <section>
+      <div className="font-medium italic">
+        <RainbowText
+          className="flex items-center"
+          animated={searchResults === undefined}
+        >
+          <SearchOutlined className={"mr-2"} />
+          <span>Searching for&nbsp;</span>
+          <span className="max-w-[500px] overflow-hidden text-ellipsis whitespace-nowrap">
+            {(toolCall.args as { query: string }).query}
+          </span>
+        </RainbowText>
+      </div>
+      {searchResults && (
+        <div className="px-5">
+          <ul className="mt-2 flex flex-wrap gap-4">
+            {searchResults.map((searchResult, i) => (
+              <motion.li
+                key={`search-result-${i}`}
+                className="text-muted-foreground flex max-w-40 gap-2 rounded-md bg-slate-100 px-2 py-1 text-sm"
+                initial={{ opacity: 0, y: 10, scale: 0.66 }}
+                animate={{ opacity: 1, y: 0, scale: 1 }}
+                transition={{
+                  duration: 0.2,
+                  delay: i * 0.1,
+                  ease: "easeOut",
+                }}
+              >
+                <FavIcon url={searchResult.url} title={searchResult.title} />
+                <a href={searchResult.url} target="_blank">
+                  {searchResult.title}
+                </a>
+              </motion.li>
+            ))}
+          </ul>
+        </div>
+      )}
+    </section>
+  );
+}
+
+function CrawlToolCall({ toolCall }: { toolCall: ToolCallRuntime }) {
+  const url = useMemo(
+    () => (toolCall.args as { url: string }).url,
+    [toolCall.args],
+  );
+  const title = useMemo(() => __pageCache.get(url), [url]);
+  return (
+    <section>
+      <div className="font-medium italic">
+        <RainbowText
+          className="flex items-center"
+          animated={toolCall.result === undefined}
+        >
+          <BookOutlined className={"mr-2"} />
+          <span>Reading&nbsp;</span>
+          <li className="flex w-fit gap-1 px-2 py-1 text-sm">
+            <FavIcon url={url} title={title} />
+            <a className="hover:underline" href={url} target="_blank">
+              {title}
+            </a>
+          </li>
+        </RainbowText>
+      </div>
+    </section>
+  );
+}
+
+function PythonToolCall({ toolCall }: { toolCall: ToolCallRuntime }) {
+  const code = useMemo<string>(() => {
+    return (toolCall.args as { code: string }).code;
+  }, [toolCall.args]);
+  return (
+    <section>
+      <div className="font-medium italic">
+        <PythonOutlined className={"mr-2"} />
+        <RainbowText animated={toolCall.result === undefined}>
+          Running Python code
+        </RainbowText>
+      </div>
+      <div className="px-5">
+        <div className="mt-2 rounded-md bg-slate-50 p-2 text-sm">
+          <SyntaxHighlighter language="python" style={docco}>
+            {code}
+          </SyntaxHighlighter>
+        </div>
+      </div>
+    </section>
+  );
+}

web/src/app/_components/research-block.tsx

@@ -0,0 +1,102 @@
+import { CloseOutlined } from "@ant-design/icons";
+import { useEffect, useState } from "react";
+
+import { Button } from "~/components/ui/button";
+import { Card } from "~/components/ui/card";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "~/components/ui/tabs";
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipTrigger,
+} from "~/components/ui/tooltip";
+import { openResearch, useStore } from "~/core/store";
+import { cn } from "~/lib/utils";
+
+import { ResearchActivitiesBlock } from "./research-activities-block";
+import { ResearchReportBlock } from "./research-report-block";
+import { ScrollContainer } from "./scroll-container";
+
+export function ResearchBlock({
+  className,
+  researchId = null,
+}: {
+  className?: string;
+  researchId: string | null;
+}) {
+  const reportId = useStore((state) =>
+    researchId ? state.researchReportIds.get(researchId) : undefined,
+  );
+  const [activeTab, setActiveTab] = useState("activities");
+  const hasReport = useStore((state) =>
+    researchId ? state.researchReportIds.has(researchId) : false,
+  );
+  useEffect(() => {
+    if (hasReport) {
+      setActiveTab("report");
+    }
+  }, [hasReport]);
+
+  return (
+    <div className={cn("h-full w-full", className)}>
+      <Card className={cn("relative h-full w-full pt-4", className)}>
+        <div className="absolute right-4 flex h-9 items-center">
+          <Tooltip>
+            <TooltipTrigger asChild>
+              <Button
+                className="text-gray-400"
+                size="sm"
+                variant="ghost"
+                onClick={() => {
+                  openResearch(null);
+                }}
+              >
+                <CloseOutlined />
+              </Button>
+            </TooltipTrigger>
+            <TooltipContent>Close</TooltipContent>
+          </Tooltip>
+        </div>
+        <Tabs
+          className="flex h-full w-full flex-col"
+          value={activeTab}
+          onValueChange={(value) => setActiveTab(value)}
+        >
+          <div className="flex w-full justify-center">
+            <TabsList className="">
+              <TabsTrigger
+                className="px-8"
+                value="report"
+                disabled={!hasReport}
+              >
+                Report
+              </TabsTrigger>
+              <TabsTrigger className="px-8" value="activities">
+                Activities
+              </TabsTrigger>
+            </TabsList>
+          </div>
+          <TabsContent className="h-full min-h-0 flex-grow px-8" value="report">
+            <ScrollContainer className="px-5pb-20 h-full">
+              {reportId && (
+                <ResearchReportBlock className="mt-4" messageId={reportId} />
+              )}
+            </ScrollContainer>
+          </TabsContent>
+          <TabsContent
+            className="h-full min-h-0 flex-grow px-8"
+            value="activities"
+          >
+            <ScrollContainer className="h-full">
+              {researchId && (
+                <ResearchActivitiesBlock
+                  className="mt-4"
+                  researchId={researchId}
+                />
+              )}
+            </ScrollContainer>
+          </TabsContent>
+        </Tabs>
+      </Card>
+    </div>
+  );
+}

web/src/app/_components/research-report-block.tsx

@@ -0,0 +1,21 @@
+import { useMessage } from "~/core/store";
+import { cn } from "~/lib/utils";
+
+import { LoadingAnimation } from "./loading-animation";
+import { Markdown } from "./markdown";
+
+export function ResearchReportBlock({
+  className,
+  messageId,
+}: {
+  className?: string;
+  messageId: string;
+}) {
+  const message = useMessage(messageId);
+  return (
+    <div className={cn("flex flex-col pb-8", className)}>
+      <Markdown animate>{message?.content}</Markdown>
+      {message?.isStreaming && <LoadingAnimation className="my-12" />}
+    </div>
+  );
+}

web/src/app/_components/rolling-text.tsx

@@ -0,0 +1,33 @@
+import { motion, AnimatePresence } from "framer-motion";
+
+import { cn } from "~/lib/utils";
+
+export function RollingText({
+  className,
+  children,
+}: {
+  className?: string;
+  children?: string | string[];
+}) {
+  return (
+    <span
+      className={cn(
+        "relative flex h-[2em] items-center overflow-hidden",
+        className,
+      )}
+    >
+      <AnimatePresence mode="popLayout">
+        <motion.div
+          className="absolute w-fit"
+          style={{ transition: "all 0.3s ease-in-out" }}
+          initial={{ y: "100%", opacity: 0 }}
+          animate={{ y: "0%", opacity: 1 }}
+          exit={{ y: "-100%", opacity: 0 }}
+          transition={{ duration: 0.3, ease: "easeInOut" }}
+        >
+          {children}
+        </motion.div>
+      </AnimatePresence>
+    </span>
+  );
+}

web/src/app/_components/scroll-container.tsx

@@ -0,0 +1,54 @@
+import { useStickToBottom } from "use-stick-to-bottom";
+
+import { cn } from "~/lib/utils";
+
+export function ScrollContainer({
+  className,
+  children,
+  scrollShadow = true,
+  scrollShadowColor = "white",
+}: {
+  className?: string;
+  children: React.ReactNode;
+  scrollShadow?: boolean;
+  scrollShadowColor?: string;
+}) {
+  const { scrollRef, contentRef } = useStickToBottom({
+    initial: "instant",
+  });
+  return (
+    <div className={cn("relative", className)}>
+      {scrollShadow && (
+        <>
+          <div
+            className={cn(
+              "absolute top-0 right-0 left-0 z-10 h-10 bg-gradient-to-b",
+              `from-[var(--scroll-shadow-color)] to-transparent`,
+            )}
+            style={
+              {
+                "--scroll-shadow-color": scrollShadowColor,
+              } as React.CSSProperties
+            }
+          ></div>
+          <div
+            className={cn(
+              "absolute right-0 bottom-0 left-0 z-10 h-10 bg-gradient-to-b",
+              `from-transparent to-[var(--scroll-shadow-color)]`,
+            )}
+            style={
+              {
+                "--scroll-shadow-color": scrollShadowColor,
+              } as React.CSSProperties
+            }
+          ></div>
+        </>
+      )}
+      <div ref={scrollRef} className={"h-full w-full overflow-y-scroll"}>
+        <div className="h-fit w-full" ref={contentRef}>
+          {children}
+        </div>
+      </div>
+    </div>
+  );
+}

web/src/app/_components/welcome.tsx

@@ -0,0 +1,31 @@
+import { motion } from "framer-motion";
+
+import { cn } from "~/lib/utils";
+
+export function Welcome({ className }: { className?: string }) {
+  return (
+    <motion.div
+      className={cn("flex flex-col", className)}
+      style={{ transition: "all 0.2s ease-out" }}
+      initial={{ opacity: 0, scale: 0.85 }}
+      animate={{ opacity: 1, scale: 1 }}
+    >
+      <h3 className="mb-2 text-center text-3xl font-medium">
+        👋 Hello, there!
+      </h3>
+      <div className="px-4 text-center text-lg text-gray-400">
+        Welcome to{" "}
+        <a
+          href="https://github.com/bytedance/deer"
+          target="_blank"
+          rel="noopener noreferrer"
+          className="hover:underline"
+        >
+          🦌 Deer
+        </a>
+        , a research tool built on cutting-edge language models, helps you
+        search on web, browse information, and handle complex tasks.
+      </div>
+    </motion.div>
+  );
+}

web/src/app/layout.tsx

@@ -0,0 +1,30 @@
+import "~/styles/globals.css";
+
+import { type Metadata } from "next";
+import { Geist } from "next/font/google";
+
+import { TooltipProvider } from "~/components/ui/tooltip";
+
+export const metadata: Metadata = {
+  title: "🦌 Deer",
+  description:
+    "Deep Exploration and Efficient Research, an AI tool that combines language models with specialized tools for research tasks.",
+  icons: [{ rel: "icon", url: "/favicon.ico" }],
+};
+
+const geist = Geist({
+  subsets: ["latin"],
+  variable: "--font-geist-sans",
+});
+
+export default function RootLayout({
+  children,
+}: Readonly<{ children: React.ReactNode }>) {
+  return (
+    <html lang="en" className={`${geist.variable}`}>
+      <body className="h-screen w-screen overflow-hidden overscroll-none bg-[#f7f5f3]">
+        <TooltipProvider>{children}</TooltipProvider>
+      </body>
+    </html>
+  );
+}

web/src/app/page.tsx

@@ -0,0 +1,61 @@
+"use client";
+
+import { GithubOutlined } from "@ant-design/icons";
+import Link from "next/link";
+import { useMemo } from "react";
+
+import { Button } from "~/components/ui/button";
+import { useStore } from "~/core/store";
+import { cn } from "~/lib/utils";
+
+import { Logo } from "./_components/logo";
+import { MessagesBlock } from "./_components/messages-block";
+import { ResearchBlock } from "./_components/research-block";
+
+export default function HomePage() {
+  const openResearchId = useStore((state) => state.openResearchId);
+  const doubleColumnMode = useMemo(
+    () => openResearchId !== null,
+    [openResearchId],
+  );
+  return (
+    <div className="flex h-full w-full justify-center">
+      <header className="fixed top-0 left-0 flex h-12 w-full w-screen items-center justify-between px-4">
+        <Logo />
+        <Button
+          className="opacity-70 transition-opacity duration-300 hover:opacity-100"
+          variant="ghost"
+          size="icon"
+          asChild
+        >
+          <Link href="https://github.com/bytedance/deer" target="_blank">
+            <GithubOutlined />
+          </Link>
+        </Button>
+      </header>
+      <div
+        className={cn(
+          "flex h-full w-full justify-center px-4 pt-12",
+          doubleColumnMode && "gap-8",
+        )}
+      >
+        <MessagesBlock
+          className={cn(
+            "shrink-0 transition-all duration-300 ease-out",
+            !doubleColumnMode &&
+              `w-[768px] translate-x-[min(calc((100vw-538px)*0.75/2),960px/2)]`,
+            doubleColumnMode && `w-[538px]`,
+          )}
+        />
+        <ResearchBlock
+          className={cn(
+            "w-[min(calc((100vw-538px)*0.75),960px)] pb-4 transition-all duration-300 ease-out",
+            !doubleColumnMode && "scale-0",
+            doubleColumnMode && "",
+          )}
+          researchId={openResearchId}
+        />
+      </div>
+    </div>
+  );
+}