// Modified from https://gist.github.com/IbeVanmeenen/4e3e58820c9168806e57530563612886
// which is based on https://stackoverflow.com/questions/3177836/how-to-format-time-since-xxx-e-g-4-minutes-ago-similar-to-stack-exchange-site

const epochs = [
    ['year', 31536000],
    ['month', 2592000],
    ['day', 86400],
    ['hour', 3600],
    ['minute', 60],
    ['second', 1]
] as const;

// Get duration
const getDuration = (timeAgoInSeconds: number) => {
    for (let [name, seconds] of epochs) {
        const interval = Math.floor(timeAgoInSeconds / seconds);

        if (interval >= 1) {
            return {
                interval: interval,
                epoch: name
            };
        }
    }

    return {
        interval: 0,
        epoch: 'second'
    }
};

// Calculate
const timeAgo = (date: Date) => {
    const timeAgoInSeconds = Math.floor((new Date().getTime() - new Date(date).getTime()) / 1000);
    const { interval, epoch } = getDuration(timeAgoInSeconds);
    const suffix = interval === 1 ? '' : 's';

    return `${interval} ${epoch}${suffix} ago`;
};

export default timeAgo