[nunu/#43] feat: SplashActivity 자동로그인 구현

- jwt Header에 담기 (Retrofit 공식문서 참고)
- 성공 시 MainActivity 이동
- 실패 시 LoginActivity 이동

UMC_6th/app/src/main/java/com/example/umc_6th/SplashActivity.kt

@@ -4,6 +4,7 @@ import android.content.Intent
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import com.example.umc_6th.databinding.ActivitySplashBinding
+import retrofit2.Call
 
 class SplashActivity :AppCompatActivity() {
     private lateinit var binding : ActivitySplashBinding
@@ -13,10 +14,52 @@ class SplashActivity :AppCompatActivity() {
         binding = ActivitySplashBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
+        // 자동 로그인 시도
+       // attemptAutoLogin()
+
         android.os.Handler().postDelayed({
             startActivity(Intent(this, MainActivity::class.java))
             finish()
             overridePendingTransition(0, 0)
         }, 2000)
     }
+
+/* 자동 로그인 splash
+    private fun attemptAutoLogin() {
+        val token = loadJwtToken()
+        if (token.isNullOrEmpty()) {
+            navigateToLoginActivity()
+        } else {
+            RetrofitInstance.authApi.autoLogin("Bearer $token").enqueue(object : Callback<BaseResponse> {
+                override fun onResponse(call: Call<BaseResponse>, response: Response<BaseResponse>) {
+                    if (response.isSuccessful && response.body()?.code == 1000) {
+                        navigateToMainActivity()
+                    } else {
+                        navigateToLoginActivity()
+                    }
+                }
+
+                override fun onFailure(call: Call<BaseResponse>, t: Throwable) {
+                    navigateToLoginActivity()
+                }
+            })
+        }
+    }
+
+    private fun loadJwtToken(): String? {
+        // SharedPreferences에서 JWT 토큰 로드
+        return getSharedPreferences("UserPrefs", MODE_PRIVATE).getString("jwt_token", null)
+    }
+
+    private fun navigateToMainActivity() {
+        startActivity(Intent(this, MainActivity::class.java)) // MainActivity로 이동
+        finish()
+    }
+
+    private fun navigateToLoginActivity() {
+        startActivity(Intent(this, LoginActivity::class.java)) //LoginActivity로 이동
+        finish()
+    }
+
+ */
 }