feat(problem-editor): add LSP support and language client connection

src/components/problem-editor.tsx

@@ -7,6 +7,9 @@ import { Loading } from "@/components/loading";
 import { shikiToMonaco } from "@shikijs/monaco";
 import { useProblem } from "@/hooks/use-problem";
 import type { Monaco } from "@monaco-editor/react";
+import { useCallback, useEffect, useRef } from "react";
+import { connectToLanguageServer } from "@/lib/language-server";
+import type { MonacoLanguageClient } from "monaco-languageclient";
 import { DefaultEditorOptionConfig } from "@/config/editor-option";
 
 // Dynamically import Monaco Editor with SSR disabled
@@ -25,14 +28,81 @@ const Editor = dynamic(
 );
 
 export function CodeEditor() {
-  const { setEditor, currentLang, currentPath, currentTheme, currentValue, changeValue } = useProblem();
+  const {
+    hydrated,
+    editor,
+    setEditor,
+    setMonacoLanguageClient,
+    currentLang,
+    currentPath,
+    currentTheme,
+    currentValue,
+    changeValue,
+    currentEditorLanguageConfig,
+    currentLanguageServerConfig,
+  } = useProblem();
+
+  const monacoLanguageClientRef = useRef<MonacoLanguageClient | null>(null);
+
+  // Connect to LSP only if enabled
+  const connectLSP = useCallback(async () => {
+    if (!(currentLang && editor)) return;
+
+    // If there's an existing language client, stop it first
+    if (monacoLanguageClientRef.current) {
+      monacoLanguageClientRef.current.stop();
+      monacoLanguageClientRef.current = null;
+      setMonacoLanguageClient(null);
+    }
+
+    if (!currentEditorLanguageConfig || !currentLanguageServerConfig) return;
+
+    // Create a new language client
+    try {
+      const monacoLanguageClient = await connectToLanguageServer(
+        currentEditorLanguageConfig,
+        currentLanguageServerConfig,
+      );
+      monacoLanguageClientRef.current = monacoLanguageClient;
+      setMonacoLanguageClient(monacoLanguageClient);
+    } catch (error) {
+      console.error("Failed to connect to LSP:", error);
+    }
+  }, [
+    currentEditorLanguageConfig,
+    currentLang,
+    currentLanguageServerConfig,
+    editor,
+    setMonacoLanguageClient,
+  ]);
+
+  // Reconnect to the LSP whenever language or lspConfig changes
+  useEffect(() => {
+    connectLSP();
+  }, [connectLSP]);
+
+  // Cleanup the LSP connection when the component unmounts
+  useEffect(() => {
+    return () => {
+      if (monacoLanguageClientRef.current) {
+        monacoLanguageClientRef.current.stop();
+        monacoLanguageClientRef.current = null;
+        setMonacoLanguageClient(null);
+      }
+    };
+  }, [setMonacoLanguageClient]);
+
+  if (!hydrated) {
+    return <Loading />;
+  }
 
   const handleBeforeMount = (monaco: Monaco) => {
     shikiToMonaco(highlighter, monaco);
   };
 
-  const handleOnMount = (editor: editor.IStandaloneCodeEditor) => {
+  const handleOnMount = async (editor: editor.IStandaloneCodeEditor) => {
     setEditor(editor);
+    await connectLSP();
   };
 
   const handleOnChange = (value: string | undefined) => {