Refactor syncUtils module

Refactor the syncUtils module to improve code organization and maintainability by breaking it down into smaller, more focused utility functions.

src/utils/sync/transactionSync.ts

@@ -0,0 +1,76 @@
+
+import { supabase } from '@/lib/supabase';
+import { Transaction } from '@/components/TransactionCard';
+import { isSyncEnabled } from './syncSettings';
+
+/**
+ * Upload transaction data from local storage to Supabase
+ */
+export const uploadTransactions = async (userId: string): Promise<void> => {
+  if (!isSyncEnabled()) return;
+
+  try {
+    const localTransactions = localStorage.getItem('transactions');
+    if (!localTransactions) return;
+    
+    const transactions: Transaction[] = JSON.parse(localTransactions);
+    
+    // 기존 데이터 삭제 후 새로 업로드
+    await supabase
+      .from('transactions')
+      .delete()
+      .eq('user_id', userId);
+      
+    // 트랜잭션 배치 처리
+    const { error } = await supabase.from('transactions').insert(
+      transactions.map(t => ({
+        user_id: userId,
+        title: t.title,
+        amount: t.amount,
+        date: t.date,
+        category: t.category,
+        type: t.type,
+        transaction_id: t.id // 로컬 ID 보존
+      }))
+    );
+    
+    if (error) throw error;
+    
+    console.log('트랜잭션 업로드 완료');
+  } catch (error) {
+    console.error('트랜잭션 업로드 실패:', error);
+  }
+};
+
+/**
+ * Download transaction data from Supabase to local storage
+ */
+export const downloadTransactions = async (userId: string): Promise<void> => {
+  if (!isSyncEnabled()) return;
+
+  try {
+    const { data, error } = await supabase
+      .from('transactions')
+      .select('*')
+      .eq('user_id', userId);
+      
+    if (error) throw error;
+    
+    if (data && data.length > 0) {
+      // Supabase 형식에서 로컬 형식으로 변환
+      const transactions = data.map(t => ({
+        id: t.transaction_id || t.id,
+        title: t.title,
+        amount: t.amount,
+        date: t.date,
+        category: t.category,
+        type: t.type
+      }));
+      
+      localStorage.setItem('transactions', JSON.stringify(transactions));
+      console.log('트랜잭션 다운로드 완료');
+    }
+  } catch (error) {
+    console.error('트랜잭션 다운로드 실패:', error);
+  }
+};