// 日期范围辅助函数
function getMonthRange(qYear, qMonth) {
  const now = new Date();
  const y = Number(qYear) || now.getFullYear();
  const m = Number(qMonth) || (now.getMonth() + 1);
  const startDate = `${y}-${String(m).padStart(2, '0')}-01`;
  const nm = m + 1 > 12 ? 1 : m + 1;
  const ny = m + 1 > 12 ? y + 1 : y;
  const endDate = `${ny}-${String(nm).padStart(2, '0')}-01`;
  return { startDate, endDate };
}

// CSV行解析（处理引号内的逗号）
function parseCSVLine(line) {
  const result = [];
  let current = '';
  let inQuotes = false;
  for (let i = 0; i < line.length; i++) {
    const ch = line[i];
    if (inQuotes) {
      if (ch === '"' && line[i + 1] === '"') { current += '"'; i++; }
      else if (ch === '"') { inQuotes = false; }
      else { current += ch; }
    } else {
      if (ch === '"') { inQuotes = true; }
      else if (ch === ',') { result.push(current); current = ''; }
      else { current += ch; }
    }
  }
  result.push(current);
  return result;
}

module.exports = { getMonthRange, parseCSVLine };