[Feature]: [FE] 모임 신청 폼

frontend/src/app/groups/[groupId]/join/ClientPage.tsx

@@ -0,0 +1,88 @@
+'use client';
+
+import { useState } from 'react';
+import { useRouter } from 'next/navigation';
+import { Button } from '@/components/ui/button';
+
+interface Props {
+    groupId: string;
+}
+
+export default function ClientPage({ groupId }: Props) {
+    const router = useRouter();
+    const [context, setContext] = useState('');
+    const [error, setError] = useState<string | null>(null);
+    const [isSubmitting, setIsSubmitting] = useState(false);
+
+    const handleSubmit = async (e: React.FormEvent) => {
+        e.preventDefault();
+        setIsSubmitting(true);
+        setError(null);
+
+        try {
+            const token = localStorage.getItem('accessToken');
+            if (!token) {
+                setError('로그인이 필요합니다.');
+                setIsSubmitting(false);
+                return;
+            }
+
+            const response = await fetch(`http://localhost:8080/api/v1/groups/${groupId}`, {
+                method: 'POST',
+                headers: {
+                    'Accept': 'application/json',
+                    'Content-Type': 'application/json',
+                    'Authorization': `Bearer ${token}`,
+                },
+                body: JSON.stringify({ context }),
+            });
+
+            const result = await response.json();
+
+            if (!response.ok) {
+                if (result.code === 'MA006') {
+                    setError('이미 가입 신청된 회원입니다.');
+                } else {
+                    throw new Error(result.message || '모임 가입 신청에 실패했습니다.');
+                }
+                return;
+            }
+
+            alert('가입 신청이 완료되었습니다.');
+            router.push(`/groups/${groupId}`);
+        } catch (error) {
+            setError(error instanceof Error ? error.message : '모임 가입 신청 중 오류가 발생했습니다.');
+        } finally {
+            setIsSubmitting(false);
+        }
+    };
+
+    return (
+        <div className='max-w-xl mx-auto px-6 py-12'>
+            <h1 className='text-2xl font-bold mb-6'>모임 가입 신청</h1>
+            <form onSubmit={handleSubmit} className='space-y-6 bg-white dark:bg-gray-800 p-8 rounded-lg shadow-lg'>
+                <label className='block'>
+                    <span className='text-gray-700 dark:text-gray-200'>가입 신청 메시지</span>
+                    <textarea
+                        className='mt-2 w-full p-3 border rounded-md dark:bg-gray-700 dark:border-gray-600 dark:text-white'
+                        rows={6}
+                        value={context}
+                        onChange={(e) => setContext(e.target.value)}
+                        placeholder='간단한 자기소개나 가입 이유를 적어주세요.'
+                        required
+                    />
+                </label>
+
+                {error && <div className='text-red-600'>{error}</div>}
+
+                <Button
+                    type='submit'
+                    disabled={isSubmitting}
+                    className='text-sm px-5 py-2.5 bg-emerald-600 hover:bg-emerald-700 self-start'
+                >
+                    {isSubmitting ? '신청 중...' : '가입 신청'}
+                </Button>
+            </form>
+        </div>
+    );
+}

frontend/src/app/groups/[groupId]/join/page.tsx

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+'use client';
+
+import { useParams } from 'next/navigation';
+import ClientPage from './ClientPage';
+
+export default function Page() {
+    const { groupId } = useParams<{ groupId: string }>();
+
+    if (!groupId) {
+        return <div>잘못된 접근입니다.</div>;
+    }
+
+    return <ClientPage groupId={groupId} />;
+}