export class Age
{
    static calc(date: Date)
    {
        const today = new Date().getTime() / 1000;
        const createdAt = new Date(date).getTime() / 1000;
        const dif = today - createdAt;
        if (dif < 60)
        {
            return Age.format(dif, ChronoUnit.SECOND) + " ago";
        }
        if (dif < 60 * 60)
        {
            const minutes = Math.floor((dif / 60));
            return Age.format(minutes, ChronoUnit.MINUTE) + " ago";
        }
        if (dif < 60 * 60 * 24)
        {
            const hours = Math.floor(dif / (60 * 60));
            return Age.format(hours, ChronoUnit.HOUR) + " ago";
        }
        else
        {
            const days = Math.floor(dif / (60 * 60 * 24));
            return Age.format(days, ChronoUnit.DAY) + " ago";
        }
    }

    static format(count: number, unit: ChronoUnit): string
    {
        if (unit === ChronoUnit.SECOND)
        {
            if (count != 1)
            {
                return count.toFixed(0) + " seconds";
            }
            else
            {
                return count.toFixed(0) + " second";
            }
        }
        if (unit === ChronoUnit.MINUTE)
        {
            if (count != 1)
            {
                return count.toFixed(0) + " minutes";
            }
            else
            {
                return count.toFixed(0) + " minute";
            }
        }
        if (unit === ChronoUnit.HOUR)
        {
            if (count != 1)
            {
                return count.toFixed(0) + " hours";
            }
            else
            {
                return count.toFixed(0) + " hour";
            }
        }
        if (unit === ChronoUnit.DAY)
        {
            if (count != 1)
            {
                return count.toFixed(0) + " days";
            }
            else
            {
                return count.toFixed(0) + " day";
            }
        }
        return "-";
    }
}


enum ChronoUnit
{
    SECOND, MINUTE, HOUR, DAY
}