LONDON-IOS/GME Remit/Extensions/String+Ext.swift

//
//  StringExtension.swift
//  GMERemittance
//
//  Created by Sujal on 12/13/17.
//  Copyright © 2017 Gobal Money Express Co. Ltd. All rights reserved.
//

import Foundation

enum CurrencyType {
  case usd
  case krw
  case `nil`
  
  var front: String {
    switch self {
    case .usd: return "USD "
    case .krw: return "KRW "
    case .nil: return ""
    }
  }
  
  var end: String {
    switch self {
    case .usd: return " USD"
    case .krw: return " KRW"
    case .nil: return ""
    }
  }
}

extension String {
  var imageURLInResource: String {
    switch self {
    case "001": return "ic_cap"
    case "002": return "ic_tshirt"
    case "003": return "ic_glass"
    case "004": return "ic_watch"
    default:
      return ""
    }
  }
  
  var isBlank: Bool {
    return trimmingCharacters(in: CharacterSet.whitespacesAndNewlines).isEmpty
  }
  
  func toBase64() -> String {
    let data = self.data(using: String.Encoding.utf8)
    return data!.base64EncodedString()
  }
  
  func removeWhitespacesInBetween() -> String {
    return components(separatedBy: .whitespaces).joined()
  }
  
  func stringRemovingComma() -> String {
    return extract(regex: "[0-9.]")
  }
  
  func getDateFromDateTime() -> String {
    return components(separatedBy: .whitespaces)[0]
  }
  
  func removeSpacesTrailingPreceding() -> String {
    return trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
  }
  
}

extension String {
  func likeCommaMoney() -> String? {
    if Double(self) == nil {
      return nil
    }
    
    return Utility.getCommaSeperatedString(numberString: self)
  }
  
  func isEmail() -> Bool {
    let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
    let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
    return emailPred.evaluate(with: self)
  }
  
  func extract(regex: String) -> String {
    do {
      let regex = try NSRegularExpression(pattern: regex)
      let nsString = self as NSString
      let results = regex.matches(in: self, range: NSRange(location: 0, length: nsString.length))
      
      return results.map { nsString.substring(with: $0.range)}.joined()
    } catch let error {
      print("invalid regex: \(error.localizedDescription)")
      return self
    }
  }
  
  func decimalToCurrency(as type: CurrencyType = .nil, isFront: Bool = false) -> String {
    let text = self.extract(regex: "[0-9.]")
    
    guard let number = Double(text) else {
      return isFront ? "\(type.front)\(self)" : "\(self)\(type.end)"
    }
    
    let nsNumber = NSNumber(value: number)
    let currencyFormatter = NumberFormatter()
    currencyFormatter.locale = Locale(identifier: "en_US")
    currencyFormatter.numberStyle = .decimal
    let commaSeperatedNumberString = currencyFormatter.string(for: nsNumber)
    
    if isFront {
      return "\(type.front)\(commaSeperatedNumberString ?? self)"
    } else {
      return "\(commaSeperatedNumberString ?? self)\(type.end)"
    }
  }
  
  func currencyToDecimal() -> String {
    return self.extract(regex: "[0-9.]")
  }
}