feat: add language selector and Monaco editor components; update answer page with language selection and editor functionality

src/app/(app)/problems/[slug]/components/language-selector.tsx

@@ -0,0 +1,49 @@
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+
+interface LanguageOption {
+  value: string;
+  label: string;
+}
+
+interface LanguageSelectorProps {
+  value: string;
+  onChange: (language: string) => void;
+  options: LanguageOption[];
+}
+
+const LanguageSelector = ({
+  value,
+  onChange,
+  options,
+}: LanguageSelectorProps) => {
+  // 检查 options 数组是否为空或未定义
+  if (!options || options.length === 0) {
+    return null;
+  }
+
+  return (
+    <Select value={value} onValueChange={onChange}>
+      <SelectTrigger className="h-6 w-auto border-none px-1.5 py-0.5">
+        <SelectValue
+          placeholder={options[0].label}
+          defaultValue={options[0].value}
+        />
+      </SelectTrigger>
+      <SelectContent>
+        {options.map((option) => (
+          <SelectItem key={option.value} value={option.value}>
+            {option.label}
+          </SelectItem>
+        ))}
+      </SelectContent>
+    </Select>
+  );
+};
+
+export default LanguageSelector;

src/app/(app)/problems/[slug]/components/monaco-editor.tsx

@@ -0,0 +1,28 @@
+"use client";
+
+import Editor from "@monaco-editor/react";
+
+interface MonacoEditorProps {
+  language: string;
+  template: string;
+  value: string;
+  onChange: (value: string) => void;
+}
+
+export default function MonacoEditor({
+  language,
+  value,
+  onChange,
+}: MonacoEditorProps) {
+  return (
+    <div className="h-full">
+      <Editor
+        theme="vs-light"
+        language={language}
+        value={value}
+        onChange={(value) => onChange(value ?? "")}
+        options={{ minimap: { enabled: false } }}
+      />
+    </div>
+  );
+}

src/app/(app)/problems/[slug]/components/tabs-card.tsx

@@ -32,7 +32,11 @@ export function TabsCard({ tabsItems }: TabsCardProps) {
         ))}
       </TabsList>
       {tabsItems.map((tabsItem) => (
-        <TabsContent value={tabsItem.value} key={tabsItem.value}>
+        <TabsContent
+          value={tabsItem.value}
+          key={tabsItem.value}
+          className="h-full mt-0"
+        >
           {tabsItem.content}
         </TabsContent>
       ))}

src/app/(app)/problems/[slug]/components/tooltip-button.tsx

@@ -0,0 +1,27 @@
+import {
+  Tooltip,
+  TooltipContent,
+  TooltipProvider,
+  TooltipTrigger,
+} from "@/components/ui/tooltip";
+
+interface TooltipButtonProps {
+  icon: React.ReactNode;
+  tooltipText: string;
+  onClick?: () => void;
+}
+
+const TooltipButton = ({ icon, tooltipText, onClick }: TooltipButtonProps) => (
+  <TooltipProvider>
+    <Tooltip>
+      <TooltipTrigger asChild onClick={onClick}>
+        {icon}
+      </TooltipTrigger>
+      <TooltipContent side="top" sideOffset={9}>
+        <p>{tooltipText}</p>
+      </TooltipContent>
+    </Tooltip>
+  </TooltipProvider>
+);
+
+export default TooltipButton;

src/app/(app)/problems/[slug]/layout.tsx

@@ -13,6 +13,7 @@ import CommitPage from "./views/commit-page";
 import AnswerPage from "./views/answer-page";
 import ConsolePage from "./views/console-page";
 import { TabsCard } from "./components/tabs-card";
+import CodeEditorPage from "./views/code-editor-page";
 import DescriptionPage from "./views/description-page";
 
 export default async function ProblemLayout({
@@ -44,6 +45,12 @@ export default async function ProblemLayout({
       value: "code",
       content: <AnswerPage slug={slug} />,
     },
+    {
+      icon: CodeXmlIcon,
+      label: "代码编辑器",
+      value: "editor",
+      content: <CodeEditorPage slug={slug} />,
+    },
   ];
   const consoleTabsItems = [
     {

src/app/(app)/problems/[slug]/views/answer-page.tsx

@@ -1,7 +1,138 @@
+"use client";
+
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { useState } from "react";
+import MonacoEditor from "../components/monaco-editor";
+import TooltipButton from "../components/tooltip-button";
+import { Play, RefreshCw, Save, Settings } from "lucide-react";
+
 export default function AnswerPage({ slug }: { slug: string }) {
+  const templates = [
+    {
+      language: "c",
+      template: `/**
+ * Note: The returned array must be malloced, assume caller calls free().
+ */
+int* twoSum(int* nums, int numsSize, int target, int* returnSize) {
+    
+}`,
+    },
+    {
+      language: "java",
+      template: `class Solution {
+    public int[] twoSum(int[] nums, int target) {
+        
+    }
+}`,
+    },
+  ];
+
+  // 初始化当前选择的语言和模板
+  const [selectedLanguage, setSelectedLanguage] = useState(
+    templates[0].language
+  );
+  const [languageValues, setLanguageValues] = useState<{
+    [key: string]: string;
+  }>({});
+
+  // 根据选择的语言更新模板
+  const handleLanguageChange = (language: string) => {
+    setSelectedLanguage(language);
+  };
+
+  // 获取当前语言的值，如果状态中没有，则使用模板
+  const getCurrentValue = () => {
+    return (
+      languageValues[selectedLanguage] ||
+      templates.find((t) => t.language === selectedLanguage)?.template ||
+      ""
+    );
+  };
+
+  // 处理编辑器内容变化
+  const handleEditorChange = (value: string | undefined) => {
+    if (value !== undefined) {
+      setLanguageValues((prev) => ({
+        ...prev,
+        [selectedLanguage]: value,
+      }));
+    }
+  };
+
+  // 重置代码为当前语言的模板
+  const handleResetCode = () => {
+    const template = templates.find(
+      (t) => t.language === selectedLanguage
+    )?.template;
+    if (template) {
+      setLanguageValues((prev) => ({
+        ...prev,
+        [selectedLanguage]: template,
+      }));
+    }
+  };
+
+  // 从 templates 中提取语言作为选项
+  const options = templates.map((template) => ({
+    value: template.language,
+    label: template.language.toUpperCase(),
+  }));
+
   return (
-    <div className="p-4">
+    <div className="h-full flex flex-col">
-      <h1>Answer Page: {slug}</h1>
+      <header className="h-8 border-b p-1 flex flex-row items-center justify-between">
+        <div className="flex flex-row">
+          <Select value={selectedLanguage} onValueChange={handleLanguageChange}>
+            <SelectTrigger className="h-6 w-[75px] border-none shadow-none px-1.5 py-0.5">
+              <SelectValue placeholder={options[0].label} />
+            </SelectTrigger>
+            <SelectContent>
+              {options.map((option) => (
+                <SelectItem key={option.value} value={option.value}>
+                  {option.label}
+                </SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+        </div>
+        <div className="flex flex-row items-center gap-2 mr-4">
+          <TooltipButton
+            icon={<RefreshCw className="h-4 w-auto cursor-pointer" />}
+            tooltipText="重置"
+            onClick={handleResetCode}
+          />
+          <TooltipButton
+            icon={<Settings className="h-4 w-auto cursor-pointer" />}
+            tooltipText="设置"
+          />
+          <TooltipButton
+            icon={<Play className="h-4 w-auto cursor-pointer" />}
+            tooltipText="运行"
+          />
+          <TooltipButton
+            icon={<Save className="h-4 w-auto cursor-pointer" />}
+            tooltipText="保存"
+          />
+        </div>
+      </header>
+      <main className="flex-grow">
+        <MonacoEditor
+          language={selectedLanguage}
+          template={
+            templates.find((t) => t.language === selectedLanguage)?.template ||
+            ""
+          }
+          value={getCurrentValue()}
+          onChange={handleEditorChange}
+        />
+      </main>
+      <footer className="h-9 bg-muted rounded-b-lg px-3 py-2"></footer>
     </div>
   );
 }

src/app/(app)/problems/[slug]/views/code-editor-page.tsx

@@ -0,0 +1,3 @@
+export default function CodeEditorPage({ slug }: { slug: string }) {
+  return <div className="h-full flex flex-col"></div>;
+}