refactor: nav and search.

feat: use recoil to replace redux
feat: use react-native

THIS IS NOT FINISHED. DONT USE THIS

client/src/routes/Chat.jsx

@@ -0,0 +1,67 @@
+import React, { useEffect } from "react";
+import { useNavigate, useParams } from "react-router-dom";
+import { useRecoilState, useRecoilValue, useSetRecoilState } from "recoil";
+
+import Landing from "../components/ui/Landing";
+import Messages from "../components/Messages";
+import TextChat from "../components/Input";
+
+import store from "~/store";
+import manualSWR from "~/utils/fetchers";
+// import TextChat from './components/Main/TextChat';
+
+// {/* <TextChat messages={messages} /> */}
+
+export default function Chat() {
+  const [conversation, setConversation] = useRecoilState(store.conversation);
+  const setMessages = useSetRecoilState(store.messages);
+  const messagesTree = useRecoilValue(store.messagesTree);
+  const { newConversation } = store.useConversation();
+  const { conversationId } = useParams();
+  const navigate = useNavigate();
+
+  const { trigger: messagesTrigger } = manualSWR(
+    `/api/messages/${conversation?.conversationId}`,
+    "get"
+  );
+
+  const { trigger: conversationTrigger } = manualSWR(
+    `/api/convos/${conversationId}`,
+    "get"
+  );
+
+  // when conversation changed or conversationId (in url) changed
+  useEffect(() => {
+    if (conversation === null) {
+      // no current conversation, we need to do something
+      if (conversationId == "new") {
+        // create new
+        newConversation();
+      } else {
+        // fetch it from server
+        conversationTrigger().then(setConversation);
+        setMessages(null);
+        console.log("NEED TO FETCH DATA");
+      }
+    } else if (conversation?.conversationId !== conversationId)
+      // conversationId (in url) should always follow conversation?.conversationId, unless conversation is null
+      navigate(`/chat/${conversation?.conversationId}`);
+  }, [conversation, conversationId]);
+
+  // when messagesTree is null (<=> messages is null)
+  // we need to fetch message list from server
+  useEffect(() => {
+    if (messagesTree === null) {
+      messagesTrigger().then(setMessages);
+    }
+  }, [conversation?.conversationId]);
+
+  if (conversation?.conversationId !== conversationId) return null;
+
+  return (
+    <>
+      {conversationId == "new" ? <Landing /> : <Messages />}
+      <TextChat />
+    </>
+  );
+}