docparse-supplier-nge/lib/parse/comp/getCostOther.js

process ngrid electric utility bill data for use in the docparse system

var num = require('num');
var inspect = require('eyespect').inspector();
var rk = require('required-keys');
module.exports = function (data, cb) {
  var keys = ['text', 'costSupply'];
  var err = rk.truthySync(data, keys);
  if (err) { return cb(err); }
  var text = data.text;
  var costSupply = data.costSupply;
  var lines = text.split(/\r?\n/);
  var line, totalLine;
  var pattern = new RegExp(costSupply);
  var costSupplyFound = false;
  var totalPattern = /Total\s+Supply/;
  var costOtherLines = [];
  for (var i in lines) {
    line = lines[i].trim();
    if (totalPattern.test(line)) {
      totalLine = line;
      break;
    }
    if (pattern.test(line)) {
      costSupplyFound = true;
      continue;
    }
    if (!costSupplyFound) {
      continue;
    }
    costOtherLines.push(line);
  }
  if (!totalLine) {
    return cb('total supply charges line not found');
  }
  var costTotal = parseCostTotal(totalLine);

  if (costTotal === null || costTotal === undefined) {
    return cb('error getting comp supply cost total');
  }
  var costOther = parseCostOtherLines(costOtherLines);
  if (!costOther) {
    return cb('error getting comp supply other costs');
  }

  var checkData = {
    costOther: costOther,
    costSupply: costSupply,
    costTotal: costTotal
  };
  return check(checkData, cb);
};

/**
 * costOther.total + costSupply === costTotal
 */
function check(data, cb) {
  var costTotal = data.costTotal;
  var calc = num(data.costOther.total).add(data.costSupply);
  var eql = calc.eq(costTotal);
  if (eql) {
    return cb(null, data);
  }
  var diff = calc.sub(costTotal).toString();
  inspect(calc.toString(),'comp supply calculated value');
  inspect(costTotal, 'comp supply printed value');
  var absDiff = Math.abs(diff);
  if (absDiff < 0.5) {
    return cb(null, data);
  }
  cb('error getting comp supply cost other, printed value does not match calculated value to within 0.5', data);
}
function parseCostTotal(line) {
  var data = processLine(line);
  var value = data.value;
  return value;
}
function processLine(text) {
  text = text.trim();
  var pattern = /(.*?)(-?\d+\.?\d+)\s*$/;
  var matches = text.match(pattern);
  if (!matches || matches.length !== 3) {
    return null;
  }
  var description = matches[1].trim();
  description = description.replace(/\s{2,}/, ' ');
  var value = matches[2];

  var output = {
    description: description,
    value: value
  };
  return output;
}

function parseCostOtherLines(lines) {
  var costs = [];
  var total = num(0);
  for (var i in lines) {
    var line = lines[i];
    var cost = processLine(line);
    if (!cost) {
      continue;
    }
    costs.push(cost);
    total = total.add(cost.value);
  }
  return {
    total: total.toString(),
    costs: costs
  };
}