Factorio Calculater

factorio_calculater.js

var config = {
    blue_circuit:                   createItem(10,  1, { red_circuit: 2, green_circuit: 20 }),
    red_circuit:                    createItem(6,   1, { green_circuit: 2, plastic: 2, copper_cable: 4 }),
    green_circuit:                  createItem(0.5, 1, { copper_cable: 3 }),
    plastic:                        createItem(1,   2, { }),
    copper_cable:                   createItem(0.5, 2, { }),
    rail:                           createItem(0.5, 2, { iron_stick: 1, steel: 1 }),
    iron_stick:                     createItem(0.5, 2, { }),
    steel:                          createItem(17.5 * (1.25 / 2), 1, { }),
    gear:                           createItem(0.5, 1, { }),
    yellow_belt:                    createItem(0.5, 2, { gear: 1 }),
    red_belt:                       createItem(0.5, 1, { yellow_belt: 1, gear: 5 }),
    yellow_underground_belt:        createItem(1,   2, { yellow_belt: 5 }),
    red_underground_belt:           createItem(0.5, 2, { yellow_underground_belt: 2, gear: 40 }),
    yellow_splitter:                createItem(1,   1, { yellow_belt: 4, green_circuit: 5 }),
    red_splitter:                   createItem(2,   1, { yellow_splitter: 1, green_circuit: 10, gear: 10 }),
    yellow_inserter:                createItem(0.5, 1, { green_circuit: 1, gear: 1 }),
    red_inserter:                   createItem(0.5, 1, { yellow_inserter: 1, gear: 1 }),
    blue_inserter:                  createItem(0.5, 1, { yellow_inserter: 1, green_circuit: 2 }),
    purple_inserter:                createItem(0.5, 1, { blue_inserter: 1, green_circuit: 4 }),
    stack_inserter:                 createItem(0.5, 1, { blue_inserter: 1, red_circuit: 1, green_circuit: 15, gear: 15 }),
    stack_filter_inserter:          createItem(0.5, 1, { stack_inserter: 1, green_circuit: 5 }),
    speed_module:                   createItem(15,  1, { green_circuit: 5, red_circuit: 5 }),
    speed_module_2:                 createItem(30,  1, { speed_module: 4, red_circuit: 5, blue_circuit: 5 }),
    speed_module_3:                 createItem(60,  1, { speed_module_2: 5, red_circuit: 5, blue_circuit: 5 })
};

function createItem(time, result, reqs){
    return {
        time, 
        result,
        reqs
    };
}

function calculateFactories(type, amount, seconds, rslt = {}, nesting = 0, verbose = false){
    var cnf = config[type];
    var result = factoriesPerAmount(cnf.time, cnf.result, amount, seconds);
    rslt[type] = rslt[type] ? rslt[type]+result : result;
    if(verbose){
        console.log(' '.repeat(nesting*2) + `Building ${amount} ${type} in ${seconds}s requires: `, rslt[type], rslt);
    }

    return Object.keys(cnf.reqs).reduce((agg, n) => (
        { ...agg, ...calculateFactories(n, cnf.reqs[n] * amount, seconds, rslt, nesting + 1, verbose) }
    ), rslt);
}

function factoriesPerAmount(time, result, amount, seconds){
    return (((amount / result) / seconds) * time);
}

function sumResults([...args]){
    return args.reduce((agg, n) => {
        Object.keys(n).forEach((key) => {
            agg[key] = agg[key] ? agg[key] + n[key] : n[key];
        });
        return agg;
    }, {});
}