import { Transaction, BalanceInfo } from '../types';

export const formatRupiah = (amount: number): string => {
  return new Intl.NumberFormat('id-ID', {
    style: 'currency',
    currency: 'IDR',
    minimumFractionDigits: 0,
    maximumFractionDigits: 0,
  }).format(amount);
};

export const formatDate = (dateString: string): string => {
  const date = new Date(dateString);
  return new Intl.DateTimeFormat('id-ID', {
    day: 'numeric',
    month: 'short',
    year: 'numeric',
  }).format(date);
};

export const calculateBalance = (transactions: Transaction[]): BalanceInfo => {
  const income = transactions
    .filter((t) => t.type === 'income')
    .reduce((sum, t) => sum + t.amount, 0);
  
  const expense = transactions
    .filter((t) => t.type === 'expense')
    .reduce((sum, t) => sum + t.amount, 0);
  
  return {
    total: income - expense,
    income,
    expense,
  };
};

export const generateId = (): any => {
  return 
Date.now
().toString(36) + Math.random().toString(36).substr(2);
};

export const getCurrentDate = (): string => {
  return new Date().toISOString();
};