// Date utilities
export const getMonthStr = (date) =>
  `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}`;

export const formatMonth = (date) =>
  `${date.getFullYear()}年${date.getMonth() + 1}月`;

export const formatMoney = (num) => (num || 0).toFixed(2);

// Format date as 'YYYY-MM-DD'
export const formatDate = (date) =>
  `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}-${String(date.getDate()).padStart(2, '0')}`;

// Get current time string 'HH:MM'
export const getCurrentTimeStr = () => new Date().toTimeString().slice(0, 5);

// Parse date-time string 'YYYY-MM-DD HH:MM' into date and time parts
export const parseDateTime = (dateTimeStr) => {
  if (!dateTimeStr) return { datePart: '', timePart: '00:00' };
  const [datePart, timePart] = dateTimeStr.split(' ');
  return { datePart, timePart: timePart || '00:00' };
};

// Extract date part from 'YYYY-MM-DD HH:MM'
export const getDatePart = (dateTimeStr) => {
  if (!dateTimeStr) return '';
  return dateTimeStr.split(' ')[0];
};

// Transaction type constants
export const TRANSACTION_TYPES = {
  EXPENSE: 'expense',
  INCOME: 'income',
  ALL: 'all',
};