fundamentals.js

var request = require('request');
var earnings = require('./earnings.js');

module.exports = {
    download: function(list, cb) {
        financials_list = list.slice();
        download_financials(cb);
    },
    
    criteria: function(symbol) {
        let cashFlowNotReduce = !isReduce(symbol, 'cashFlow');
        let operatingIncomeNotReduce = !isReduce(symbol, 'operatingIncome');
        let grossProfitNotReduce = !isReduce(symbol, 'grossProfit');
        let netIncomeGrow = isGrow(symbol, 'netIncome');
        
        let lastReport = financials[symbol][0];
        
        return earnings.isEpsGrow(symbol)
            && netIncomeGrow 
            && cashFlowNotReduce 
            && operatingIncomeNotReduce 
            && grossProfitNotReduce
            && ((lastReport.totalDebt-lastReport.currentDebt)/lastReport.shareholderEquity < 0.5)
    }
}

var financials_list;
var financials = { };

function download_financials(cb) {
    console.log("Downloading financials...");
    let url = "https://api.iextrading.com/1.0/stock/market/batch?symbols="+
              financials_list.slice(0, 99).join(',')+"&types=financials";
    request(url, function(err, resp, body) {
        if (err) {
            console.error(err);
            return setTimeout(function() {
                download_historocal(cb);
            }, 10000);
        }
        var data = JSON.parse(body);
        for (symbol in data) {
            financials[symbol] = data[symbol].financials.financials;
            financials_list.splice(financials_list.indexOf(symbol), 1);
        }
        if (financials_list.length > 0)
            return download_financials(cb);
        cb();
    })
}

function isGrow(symbol, field) {
    let reports = financials[symbol];
    return reports[0][field] > reports[1][field] && reports[0][field] > reports[reports.length-1][field];
}

function isReduce(symbol, field) {
    let reports = financials[symbol];
    return reports[0][field] < reports[1][field] && reports[0][field] < reports[reports.length-1][field];
}