float.js

const log = console.log;
const rp = require('request-promise');
const config = require('./config.js')
const transformData = require('./src/transformData.js');

// ex usage: node float GPRO 77930000 2017-01-04
const ticker = process.argv[2];
const totalFloat = parseInt(process.argv[3]);
const startDate = process.argv[4];

const fetchDataForOneStock = (ticker) => new Promise((resolve, reject) => {
  log('Getting: ', '\x1b[34m', ticker, '\x1b[0m');
  return rp({ // Request data for this stock.
    uri: 'https://www.alphavantage.co/query',
    json: true,
    qs: {
      apikey: config.API_KEY,
      function: 'TIME_SERIES_DAILY',
      symbol: ticker,
      outputsize: 'full'
    },
    transform: transformData // Clean up the raw data.
  }).then((transformedData) => {
    resolve(transformedData);
  });
});


const getFloatTurnovers = (volByDate, totalFloat, startDate) => {
  for(let i = 0; i < volByDate.length; i++) {
    // Iterate until we find the startDate, then start calculating turnover cycles.
    if(volByDate[i][0] === startDate) {
      return calculateCycles(volByDate.slice(i), totalFloat);
    }
  }
  function calculateCycles(volByDate, totalFloat) {
    let remainingFloatInCycle = totalFloat;
    let turnoverDates = [];
    let results = {
      'floatRemaining': null,
      'turnovers': null
    };
    for(let j = 0; j < volByDate.length; j++) {
      remainingFloatInCycle = remainingFloatInCycle - volByDate[j][1];  
      // If we've found a turnover date, add to list and reset count.
      if(remainingFloatInCycle < 0) {
        turnoverDates.push(volByDate[j][0])
        remainingFloatInCycle += totalFloat;
      }
      // If this is the last day, return remaining float and list of turnover dates.
      if(j === volByDate.length-1) {
        results.floatRemaining = remainingFloatInCycle;
        results.turnovers = turnoverDates;
      }
    }
    return results;
  }
};

fetchDataForOneStock(ticker)
  .then((transformedData) => {
    let volumeByDate = transformedData.map((day) => {
      return [day.date, day.v];
    });
    return volumeByDate;
  }).then((volumeByDate) => {
    let result = getFloatTurnovers(volumeByDate, totalFloat, startDate);
    log(result);
  });