/**
 * 截取小数点后dots位
 * @param {Number} number 要截取的小数
 * @param {Number} dots 小数点位数
 * @returns
 */
function truncateToTenDecimals(number, dots) {
    const str = number.toString();
    const decimalIndex = str.indexOf(".");
    // 如果没有小数部分，直接返回原始数值
    if (decimalIndex === -1) {
      return str;
    }
    // 截取到小数点后 10 位
    const truncatedStr = str.slice(0, decimalIndex + dots + 1);
    return Number(truncatedStr);
  }
  
  /**
   * 根据shares队列计算每个user本轮次的分配占比
   * @param {Array} data [{user:"user1", pool_diff:100, miner_diff:100}, ]
   * @returns {"1x1":{totalWeight:10, weightRatio:0.1}}
   */
  function calculate_shares_weight(data) {
    // Step 1: 按照 user 分类计算每个 user 的总 weight
    const userWeights = data.reduce((acc, item) => {
      const weight = item.miner_diff / item.pool_diff;
      if (!acc[item.user]) {
        acc[item.user] = { totalWeight: 0, data: [] };
      }
      acc[item.user].totalWeight += weight;
      acc[item.user].data.push(item);
      return acc;
    }, {});
  
    // Step 2: 计算所有 user 的总 weight
    const totalWeight = Object.values(userWeights).reduce((acc, user) => acc + user.totalWeight, 0);
    
    // Step 3: 计算每个 user 的 weight 占总 weight 的比重并返回所需格式
    const userWeightRatios = Object.keys(userWeights).reduce((acc, user) => {
      const weightRatio = truncateToTenDecimals(userWeights[user].totalWeight / totalWeight, 10);
      acc[user] = Number(weightRatio);
      return acc;
    }, {});
    
    return userWeightRatios;
  }
  module.exports = { calculate_shares_weight, truncateToTenDecimals };