var collector = {
    units: [
        {'spear': 520},
        {'sword': 0},
        {'axe': 0},
        {'archer': 0},
        {'light': 0},
        {'marcher': 0},
        {'heavy': 0},
        {'knight': 0}
    ],
    times: 0,
    percents: [0.576923077, 0.230769231, 0.115384615, 0.0769230769],
    options: document.getElementsByClassName("options-container")[0].children,
    setUnitAmount(name, amount) {
        const element = document.getElementsByName(name)[0];

        if (element === undefined)
            return;

        element.value = amount;
        element.dispatchEvent(new Event('change'));
    },
    unitAvailable: function (name) {
        const field = document.getElementsByName(name)[0];
        if (field === undefined)
            return 0;
        const text = field.parentNode.lastChild.innerHTML;
        return +(text.substr(1, text.length - 2));
    },
    calculateAndSetUnits: function (level) {
        const percent = this.percents[level];

        for (let i = 0; i < this.units.length; i++) {
            const current = this.units[i];

            const name = Object.keys(current);
            const amount = Math.floor(current[name] * percent);
            const available = this.unitAvailable(name);

            this.setUnitAmount(name, Math.min(amount, available));
        }
    },
    select: function () {
        for (let i = 0; i < this.options.length; i++) {
            const element = this.options[i].lastChild.lastChild;

            if (element.classList.contains("inactive-view")) {

                if (element.firstChild === null)
                    continue;

                this.calculateAndSetUnits(i);
                element.lastChild.firstChild.click();
                break;
            }
        }
    }
};

collector.select();