Formatter

Formatter.swift

//
//  Formatter.swift
//  Formatter
//
//  Created by Matthew Hallatt on 30/11/2017.
//  Copyright © 2017 Gospelware. All rights reserved.
//

import Foundation

extension Formatter.DateFormat: RawRepresentable {
    public typealias RawValue = DateFormatter
    
    init?(rawValue: DateFormatter) {
        switch rawValue {
        case Formatter.DateFormat.timeFormatter:
            self = .time
        case Formatter.DateFormat.dateFormatter:
            self = .date
        default:
            return nil
        }
    }
    
    public var rawValue: DateFormatter {
        switch self {
        case .time:
            return Formatter.DateFormat.timeFormatter
        case .date:
            return Formatter.DateFormat.dateFormatter
        }
    }
}

extension Formatter.TimeIntervalFormat: RawRepresentable {
    public typealias RawValue = DateComponentsFormatter
    
    init?(rawValue: DateComponentsFormatter) {
        switch rawValue {
        case Formatter.TimeIntervalFormat.durationFormatter:
            self = .duration
        default:
            return nil
        }
    }
    
    public var rawValue: DateComponentsFormatter {
        switch self {
        case .duration:
            return Formatter.TimeIntervalFormat.durationFormatter
        }
    }
}

extension Formatter.NumberFormat: RawRepresentable {
    public typealias RawValue = NumberFormatter
    
    init?(rawValue: NumberFormatter) {
        switch rawValue {
        case Formatter.NumberFormat.decimalFormatter:
            self = .decimal
        case Formatter.NumberFormat.integerFormatter:
            self = .integer
        default:
            return nil
        }
    }
    
    public var rawValue: NumberFormatter {
        switch self {
        case .decimal:
            return Formatter.NumberFormat.decimalFormatter
        case .integer:
            return Formatter.NumberFormat.integerFormatter
        }
    }
}

struct Formatter {
    
    enum DateFormat {
        
        static var timeFormatter = DateFormatter()
        static var dateFormatter = DateFormatter()
        
        case time
        case date
    }
    
    enum TimeIntervalFormat {
        
        static var durationFormatter = DateComponentsFormatter()
        
        case duration
    }
    
    enum NumberFormat {
        static var decimalFormatter = NumberFormatter()
        static var integerFormatter = NumberFormatter()
        
        case decimal
        case integer
    }
    
    static func stringFrom(date: Date, withFormat format: DateFormat) -> String {
        return format.rawValue.string(from: date)
    }
    
    static func stringFrom(timeInterval: TimeInterval, withFormat format: TimeIntervalFormat) -> String? {
        return format.rawValue.string(from: timeInterval)
    }
    
    static func stringFrom(timeIntervalBetweenDate initialDate: Date, andDate finalDate: Date, withFormat format: TimeIntervalFormat) -> String? {
        return format.rawValue.string(from: initialDate, to: finalDate)
    }
    
    static func stringFrom(number: NSNumber, withFormat format: NumberFormat) -> String? {
        return format.rawValue.string(from: number)
    }
    
}