// 欠薪计算逻辑，基于 PRD 中的说明
export const calculateUnpaidSalary = (input) => {
  const {
    salary = 0,
    unpaidMonths = 0,
    overtimeHours = 0,
    compensationType = '0',
    yearsOfWork = 0,
    startDate,
    endDate,
  } = input || {};

  const s = Number(salary) || 0;
  const m = Number(unpaidMonths) || 0;
  const otHours = Number(overtimeHours) || 0;
  const years = Number(yearsOfWork) || 0;

  // 基本欠薪
  const basicUnpaid = s * m;

  // 加班费：小时工资 * 1.5 * 每月加班小时 * 月数
  const hourlyWage = s / 21.75 / 8;
  const overtimeUnpaid = hourlyWage * 1.5 * otHours * m;

  // 经济补偿金
  let compensation = 0;
  if (compensationType === 'n') {
    compensation = s * years;
  } else {
    compensation = s * (Number(compensationType) || 0);
  }

  // 滞纳金（按日利率 0.05%估算）
  let daysDiff = 0;
  let lateFee = 0;
  if (startDate && endDate) {
    const start = new Date(startDate);
    const end = new Date(endDate);
    if (!Number.isNaN(start.getTime()) && !Number.isNaN(end.getTime())) {
      const diff = end.getTime() - start.getTime();
      daysDiff = Math.max(0, Math.floor(diff / (1000 * 60 * 60 * 24)));
      lateFee = basicUnpaid * 0.0005 * daysDiff;
    }
  }

  const totalUnpaid = basicUnpaid + overtimeUnpaid + compensation + lateFee;

  return {
    basicUnpaid,
    overtimeUnpaid,
    compensation,
    lateFee,
    totalUnpaid,
    daysDiff,
  };
};