From 6720a5ed4639d4e7de72f8fb8420858c186ce681 Mon Sep 17 00:00:00 2001
From: Macbook <macbook@172-11-15-212.lightspeed.chrlnc.sbcglobal.net>
Date: Mon, 15 Jun 2026 13:21:42 +0900
Subject: [PATCH] =?UTF-8?q?=EC=84=9C=EB=B2=84=20=EC=9E=90=EB=8F=99?=
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---
 frontend/src/components/LoginModal.tsx   | 15 ++++++++-------
 frontend/src/components/SplashScreen.tsx | 10 ++++++----
 frontend/src/utils/loginDefaults.ts      | 23 +++++++++++++++++++++++
 3 files changed, 37 insertions(+), 11 deletions(-)
 create mode 100644 frontend/src/utils/loginDefaults.ts

diff --git a/frontend/src/components/LoginModal.tsx b/frontend/src/components/LoginModal.tsx
index a9c6cd3..268024e 100644
--- a/frontend/src/components/LoginModal.tsx
+++ b/frontend/src/components/LoginModal.tsx
@@ -4,9 +4,10 @@
 import React, { useEffect, useState } from 'react';
 import { loginUser, type LoginResponse } from '../utils/backendApi';
 import AppPopup from './AppPopup';
-
-const DEFAULT_USERNAME = 'admin';
-const DEFAULT_PASSWORD = 'admin';
+import {
+  getLoginDefaultPassword,
+  getLoginDefaultUsername,
+} from '../utils/loginDefaults';
 
 interface Props {
   open: boolean;
@@ -15,15 +16,15 @@ interface Props {
 }
 
 const LoginModal: React.FC<Props> = ({ open, onClose, onSuccess }) => {
-  const [username, setUsername] = useState(DEFAULT_USERNAME);
-  const [password, setPassword] = useState(DEFAULT_PASSWORD);
+  const [username, setUsername] = useState(() => getLoginDefaultUsername());
+  const [password, setPassword] = useState(() => getLoginDefaultPassword());
   const [error, setError] = useState<string | null>(null);
   const [loading, setLoading] = useState(false);
 
   useEffect(() => {
     if (!open) return;
-    setUsername(DEFAULT_USERNAME);
-    setPassword(DEFAULT_PASSWORD);
+    setUsername(getLoginDefaultUsername());
+    setPassword(getLoginDefaultPassword());
     setError(null);
     setLoading(false);
   }, [open]);
diff --git a/frontend/src/components/SplashScreen.tsx b/frontend/src/components/SplashScreen.tsx
index 019b1b8..dfb5443 100644
--- a/frontend/src/components/SplashScreen.tsx
+++ b/frontend/src/components/SplashScreen.tsx
@@ -3,11 +3,13 @@
  */
 import React, { useState } from 'react';
 import { loginUser, type LoginResponse } from '../utils/backendApi';
+import {
+  getLoginDefaultPassword,
+  getLoginDefaultUsername,
+} from '../utils/loginDefaults';
 import SplashConceptBackdrop from './splash/SplashConceptBackdrop';
 import '../styles/splashScreen.css';
 
-const DEFAULT_USERNAME = 'admin';
-const DEFAULT_PASSWORD = 'admin';
 const APP_VERSION = '1.0.3';
 
 interface Props {
@@ -16,8 +18,8 @@ interface Props {
 }
 
 const SplashScreen: React.FC<Props> = ({ onLoginSuccess, onGuest }) => {
-  const [username, setUsername] = useState(DEFAULT_USERNAME);
-  const [password, setPassword] = useState(DEFAULT_PASSWORD);
+  const [username, setUsername] = useState(() => getLoginDefaultUsername());
+  const [password, setPassword] = useState(() => getLoginDefaultPassword());
   const [error, setError] = useState<string | null>(null);
   const [loading, setLoading] = useState(false);
 
diff --git a/frontend/src/utils/loginDefaults.ts b/frontend/src/utils/loginDefaults.ts
new file mode 100644
index 0000000..d31c4cf
--- /dev/null
+++ b/frontend/src/utils/loginDefaults.ts
@@ -0,0 +1,23 @@
+import { isDesktop } from './platform';
+
+export const DEV_LOGIN_USERNAME = 'admin';
+export const DEV_LOGIN_PASSWORD = 'admin123!!';
+
+/** 로컬 dev·localhost·Desktop — 로그인 폼 admin / admin123!! 자동 입력 */
+export function shouldPrefillLoginCredentials(): boolean {
+  if (isDesktop()) return true;
+  if (import.meta.env.DEV) return true;
+  if (typeof window !== 'undefined') {
+    const host = window.location.hostname;
+    if (host === 'localhost' || host === '127.0.0.1') return true;
+  }
+  return false;
+}
+
+export function getLoginDefaultUsername(): string {
+  return shouldPrefillLoginCredentials() ? DEV_LOGIN_USERNAME : '';
+}
+
+export function getLoginDefaultPassword(): string {
+  return shouldPrefillLoginCredentials() ? DEV_LOGIN_PASSWORD : '';
+}