function get_interval(element) {
    let months = element.querySelector('input[name="interval_months"]').value;
    let days = element.querySelector('input[name="interval_days"]').value;
    let hours = element.querySelector('input[name="interval_hours"]').value;
    let minutes = element.querySelector('input[name="interval_minutes"]').value;
    let seconds = element.querySelector('input[name="interval_seconds"]').value;

    return {
        months: parseInt(months) || null,
        days: parseInt(days) || null,
        seconds:
            (parseInt(hours) || 0) * 3600 +
                (parseInt(minutes) || 0) * 60 +
                (parseInt(seconds) || 0) || null,
    };
}

function update_interval(element) {
    let months = element.querySelector('input[name="interval_months"]');
    let days = element.querySelector('input[name="interval_days"]');
    let hours = element.querySelector('input[name="interval_hours"]');
    let minutes = element.querySelector('input[name="interval_minutes"]');
    let seconds = element.querySelector('input[name="interval_seconds"]');

    let interval = get_interval(element);

    if (interval.months === null && interval.days === null && interval.seconds === null) {
        months.value = "";
        days.value = "";
        hours.value = "";
        minutes.value = "";
        seconds.value = "";
    } else {
        months.value = months.value.padStart(1, "0");
        days.value = days.value.padStart(1, "0");
        hours.value = hours.value.padStart(2, "0");
        minutes.value = minutes.value.padStart(2, "0");
        seconds.value = seconds.value.padStart(2, "0");

        if (seconds.value >= 60) {
            let quotient = Math.floor(seconds.value / 60);
            let remainder = seconds.value % 60;

            seconds.value = String(remainder).padStart(2, "0");
            minutes.value = String(Number(minutes.value) + Number(quotient)).padStart(
                2,
                "0"
            );
        }
        if (minutes.value >= 60) {
            let quotient = Math.floor(minutes.value / 60);
            let remainder = minutes.value % 60;

            minutes.value = String(remainder).padStart(2, "0");
            hours.value = String(Number(hours.value) + Number(quotient)).padStart(2, "0");
        }
    }
}

const $intervalGroup = document.querySelector(".interval-group");

document.querySelector(".interval-group").addEventListener(
    "blur",
    (ev) => {
        if (ev.target.nodeName !== "BUTTON") update_interval($intervalGroup);
    },
    true
);

$intervalGroup.querySelector("button.clear").addEventListener("click", () => {
    $intervalGroup.querySelectorAll("input").forEach((el) => {
        el.value = "";
    });
});

document.addEventListener("remindersLoaded", (event) => {
    for (reminder of event.detail) {
        let $intervalGroup = reminder.node.querySelector(".interval-group");

        $intervalGroup.addEventListener(
            "blur",
            (ev) => {
                if (ev.target.nodeName !== "BUTTON") update_interval($intervalGroup);
            },
            true
        );

        $intervalGroup.querySelector("button.clear").addEventListener("click", () => {
            $intervalGroup.querySelectorAll("input").forEach((el) => {
                el.value = "";
            });
        });
    }
});