// AdventOfCode2018-01
var freqChanges = [];

function parseInput(inputFile) {
    // for each line in text file parse the symbol (first character) and the number into an array of objects 
    var fs = require('fs'),
    readline = require('readline'),
    instream = fs.createReadStream(inputFile),
    outstream = new (require('stream'))(),
    rl = readline.createInterface(instream, outstream);
     
    rl.on('line', function (line) {
        var object = {
            operation: line.substr(0,1),
            value: parseInt(line.substr(1))
          }
        freqChanges.push(object);
    });
    
    rl.on('close', function (line) {
        //console.log(line);
        //console.log('done reading file.');
    });
}

parseInput('./input1.txt');

// Starting from zero, loop through all the entries in the array and apply the operations
var frequency = 0; 
console.log('length=' + freqChanges.length);
freqChanges.forEach( function (object) {
    console.log('Object contains ' + object.toString());
    if (object.operation == '+') {
        frequency += object.value;
    }
    else {
        frequency -= object.value;
    }
});
// for (i in freqChanges) { //(var i = 0; i < freqChanges.length; i++) {
//     console.log(freqChanges[i].toString());
//     if (freqChanges[i].operation = '+') {
//         frequency += freqChanges[i].value;
//     }
//     else {
//         frequency -= freqChanges[i].value;
//     }
// }

console.log('The resulting frequency is ' + frequency);