DateFormatterHelper

DateFormatterHelper.swift

//
//  DateFormatterHelper.swift
//  Rolique
//
//  Created by Bohdan Savych on 8/18/17.
//  Copyright © 2017 Rolique. All rights reserved.
//

import UIKit

extension Date {
    var startOfWeek: Date {
        return Calendar.current.date(from: Calendar.current.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self))!
    }
    
    var startOfDay: Date {
        return Calendar.current.date(from: Calendar.current.dateComponents([.year, .month, .day], from: self))!
    }
}

extension TimeInterval {
    static var minute: TimeInterval {
        return 60
    }
    
    static var hour: TimeInterval {
        return minute * 60
    }
    
    static var day: TimeInterval {
        return hour * 24
    }
    
    static var week: TimeInterval {
        return day * 7
    }
    
    static var notLeapYear: TimeInterval {
        return day * 365
    }
    
    static var leapYear: TimeInterval {
        return day * 366
    }
}

enum DateFormatterType: String {
    case `default` = "yyyy-MM-dd HH:mm:ss ZZZZZ",
    weekDay = "EEEE",
    hourMinute = "HH:mm",
    ddMMyyy = "dd/MM/yyyy"
}

final class DateFormatterHelper {
    fileprivate static let formatter = DateFormatter()
    
    static func convertToDate(from string: String, with type: DateFormatterType = .default) -> Date? {
        objc_sync_enter(self)
        defer { objc_sync_exit(self) }
        
        formatter.dateFormat = type.r
        
        return formatter.date(from: string)
    }
    
    static func convertToString(from date: Date, with type: DateFormatterType = .default) -> String {
        objc_sync_enter(self)
        defer { objc_sync_exit(self) }
        
        formatter.dateFormat = type.r
        
        return formatter.string(from: date)
    }
 
    // MARK: - Custom
    
    static func messageString(from string: String, with type: DateFormatterType) -> String? {
        guard let date = convertToDate(from: string, with: type) else { return nil }
        
        return messageString(from: date)
    }
    
    static func messageString(from date: Date) -> String {
        let currentDate = Date()
        let startOfCurrentWeek = currentDate.startOfWeek
        let startOfCurrentDay = currentDate.startOfDay
        let startOfCurrentDayDiff = date.timeIntervalSince(startOfCurrentDay)
        
        if startOfCurrentDayDiff > 0 {
            return convertToString(from: date, with: .hourMinute)
        }
        
        let startOfCurrentWeekDiff = date.timeIntervalSince(startOfCurrentWeek)
        
        if startOfCurrentWeekDiff > 0  {
            return convertToString(from: date, with: .weekDay)
        }
        
        return convertToString(from: date, with: .ddMMyyy)
    }
}

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