Refactor BudgetContext file

Refactor BudgetContext.tsx into smaller components and hooks to improve code readability and maintainability.

src/contexts/budget/budgetUtils.ts

@@ -0,0 +1,144 @@
+
+import { BudgetData, BudgetPeriod, CategoryBudget, Transaction } from './types';
+import { EXPENSE_CATEGORIES } from '@/constants/categoryIcons';
+
+// 기본 데이터 상수
+export const DEFAULT_CATEGORY_BUDGETS: Record<string, number> = {
+  식비: 400000,
+  생활비: 600000,
+  교통비: 200000
+};
+
+export const DEFAULT_MONTHLY_BUDGET = 1200000;
+
+// 카테고리별 지출 계산
+export const calculateCategorySpending = (
+  transactions: Transaction[],
+  categoryBudgets: Record<string, number>
+): CategoryBudget[] => {
+  const expenseTransactions = transactions.filter(t => t.type === 'expense');
+  const categorySpending: Record<string, number> = {};
+  
+  // 모든 카테고리에 대해 초기값 0 설정
+  Object.keys(categoryBudgets).forEach(category => {
+    categorySpending[category] = 0;
+  });
+  
+  expenseTransactions.forEach(t => {
+    if (t.category in categorySpending) {
+      categorySpending[t.category] += t.amount;
+    }
+  });
+  
+  return Object.keys(categoryBudgets).map(category => ({
+    title: category,
+    current: categorySpending[category] || 0,
+    total: categoryBudgets[category]
+  }));
+};
+
+// 예산 데이터 업데이트 계산
+export const calculateUpdatedBudgetData = (
+  prevBudgetData: BudgetData,
+  type: BudgetPeriod,
+  amount: number
+): BudgetData => {
+  if (type === 'monthly') {
+    const dailyAmount = Math.round(amount / 30);
+    const weeklyAmount = Math.round(amount / 4.3);
+    
+    return {
+      daily: {
+        targetAmount: dailyAmount,
+        spentAmount: prevBudgetData.daily.spentAmount,
+        remainingAmount: Math.max(0, dailyAmount - prevBudgetData.daily.spentAmount)
+      },
+      weekly: {
+        targetAmount: weeklyAmount,
+        spentAmount: prevBudgetData.weekly.spentAmount,
+        remainingAmount: Math.max(0, weeklyAmount - prevBudgetData.weekly.spentAmount)
+      },
+      monthly: {
+        targetAmount: amount,
+        spentAmount: prevBudgetData.monthly.spentAmount,
+        remainingAmount: Math.max(0, amount - prevBudgetData.monthly.spentAmount)
+      }
+    };
+  } else {
+    const remainingAmount = Math.max(0, amount - prevBudgetData[type].spentAmount);
+    return {
+      ...prevBudgetData,
+      [type]: {
+        ...prevBudgetData[type],
+        targetAmount: amount,
+        remainingAmount: remainingAmount
+      }
+    };
+  }
+};
+
+// 지출액 계산 (일일, 주간, 월간)
+export const calculateSpentAmounts = (
+  transactions: Transaction[],
+  prevBudgetData: BudgetData
+): BudgetData => {
+  // 지출 거래 필터링
+  const expenseTransactions = transactions.filter(t => t.type === 'expense');
+  
+  // 오늘 지출 계산
+  const todayExpenses = expenseTransactions.filter(t => {
+    if (t.date.includes('오늘')) return true;
+    return false;
+  });
+  const dailySpent = todayExpenses.reduce((sum, t) => sum + t.amount, 0);
+  
+  // 이번 주 지출 계산 (단순화된 버전)
+  const weeklyExpenses = expenseTransactions.filter(t => {
+    if (t.date.includes('오늘') || t.date.includes('어제')) return true;
+    return true;
+  });
+  const weeklySpent = weeklyExpenses.reduce((sum, t) => sum + t.amount, 0);
+  
+  // 이번 달 총 지출 계산
+  const monthlySpent = expenseTransactions.reduce((sum, t) => sum + t.amount, 0);
+
+  // 예산 데이터 업데이트
+  return {
+    daily: {
+      ...prevBudgetData.daily,
+      spentAmount: dailySpent,
+      remainingAmount: Math.max(0, prevBudgetData.daily.targetAmount - dailySpent)
+    },
+    weekly: {
+      ...prevBudgetData.weekly,
+      spentAmount: weeklySpent,
+      remainingAmount: Math.max(0, prevBudgetData.weekly.targetAmount - weeklySpent)
+    },
+    monthly: {
+      ...prevBudgetData.monthly,
+      spentAmount: monthlySpent,
+      remainingAmount: Math.max(0, prevBudgetData.monthly.targetAmount - monthlySpent)
+    }
+  };
+};
+
+// 초기 예산 데이터 생성
+export const getInitialBudgetData = (): BudgetData => {
+  return {
+    daily: {
+      targetAmount: Math.round(DEFAULT_MONTHLY_BUDGET / 30),
+      spentAmount: 0,
+      remainingAmount: Math.round(DEFAULT_MONTHLY_BUDGET / 30)
+    },
+    weekly: {
+      targetAmount: Math.round(DEFAULT_MONTHLY_BUDGET / 4.3),
+      spentAmount: 0,
+      remainingAmount: Math.round(DEFAULT_MONTHLY_BUDGET / 4.3)
+    },
+    monthly: {
+      targetAmount: DEFAULT_MONTHLY_BUDGET,
+      spentAmount: 0,
+      remainingAmount: DEFAULT_MONTHLY_BUDGET
+    }
+  };
+};