NSDate+TimeAgo.swift

//
//  IDate.swift
//
//  Created by Jonathan Duty on 6/30/16.
//

extension NSDate {
    
    
    func timeAgoString(numericDates:Bool) -> String {
        
        let date = self
        let calendar = NSCalendar.currentCalendar()
        let now = NSDate()
        let earliest = now.earlierDate(date)
        let latest = (earliest == now) ? date : now
        let components:NSDateComponents = calendar.components([NSCalendarUnit.Minute , NSCalendarUnit.Hour , NSCalendarUnit.Day , NSCalendarUnit.WeekOfYear , NSCalendarUnit.Month , NSCalendarUnit.Year , NSCalendarUnit.Second], fromDate: earliest, toDate: latest, options: NSCalendarOptions())
        
        if (components.year >= 2) {
            return "\(components.year) years ago"
        }
        else if (components.year >= 1){
            if (numericDates){
                return "1 year ago"
            }
            else {
                return "Last year"
            }
        }
        else if (components.month >= 2) {
            return "\(components.month) months ago"
        }
        else if (components.month >= 1){
            if (numericDates){
                return "1 month ago"
            }
            else {
                return "Last month"
            }
        }
        else if (components.weekOfYear >= 2) {
            return "\(components.weekOfYear) weeks ago"
        }
        else if (components.weekOfYear >= 1){
            if (numericDates){
                return "1 week ago"
            }
            else {
                return "Last week"
            }
        }
        else if (components.day >= 2) {
            return "\(components.day) days ago"
        }
        else if (components.day >= 1){
            if (numericDates){
                return "1 day ago"
            }
            else {
                return "Yesterday"
            }
        }
        else if (components.hour >= 2) {
            return "\(components.hour) hours ago"
        }
        else if (components.hour >= 1){
            if (numericDates){
                return "1 hour ago"
            }
            else {
                return "An hour ago"
            }
        }
        else if (components.minute >= 2) {
            return "\(components.minute) minutes ago"
        }
        else if (components.minute >= 1){
            if (numericDates){
                return "1 minute ago"
            }
            else {
                return "A minute ago"
            }
        }
        else if (components.second >= 3) {
            return "\(components.second) seconds ago"
        }
        else {
            return "Just now"
        }
        
    }
}