//
//  UITextField+Ext.swift
//  GME Remit
//
//  Created by InKwon Devik Kim on 04/07/2019.
//  Copyright © 2019 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit
import RxSwift
import RxCocoa

public enum GMEKeyboardType: String {
  case alphabet = "A"
  case alphabetNumberic = "AN"
  case alphabetNumbericSpecial = "ANS"
  case alphabetNumbericSpecialWithoutSpace = "ANW"
  case numberic = "N"
}

extension UITextField {
  func filterBy(type: GMEKeyboardType, isSendAction: Bool = true, isUppercase: Bool = false) {
    
    let extractText: String?
    
    let value = isUppercase ? text?.uppercased() : text
    
    switch type {
    case .alphabet: extractText = value?.extract(regex: "[A-Za-z\\s]")
    case .alphabetNumberic: extractText = value?.extract(regex: "[A-Z0-9a-z\\s]")
    case .alphabetNumbericSpecialWithoutSpace: extractText = value?.extract(regex: "[a-zA-Z0-9]")
    case .alphabetNumbericSpecial: extractText = value?.filter { $0.isASCII }
    case .numberic: extractText = text?.extract(regex: "[0-9]")
    }
    
    if text != extractText {
      text = extractText
      if isSendAction {
        sendActions(for: .valueChanged)
      }
    }
  }
  
  func filterBy(regex: String, isSendAction: Bool = true) {
     
     let extractText = text?.extract(regex: regex)
     
     if text != extractText {
       text = extractText
       if isSendAction {
         sendActions(for: .valueChanged)
       }
     }
   }
  
  func removeNonASCII(isSendAction: Bool = true) {
    guard let inputText = text else { return }
    
    text = inputText.filter { $0.isASCII }
    
    if text != inputText && isSendAction {
      sendActions(for: .editingChanged)
    }
  }
  
  func filterForUserIDFormat(isSendAction: Bool = true) {
    let extractText = text?.extract(regex: "[A-Z0-9a-z._@-]")
    if text != extractText {
      text = extractText
      if isSendAction {
        sendActions(for: .editingChanged)
      }
    }
  }
    
}

extension UITextField {
  private var leftViewPadding: CGFloat {
    return 8
  }
  
  private var widthOfImageInLeftView: CGFloat {
    return 35
  }
  
  func setCoutryFlag(with code: String?) {
    guard
      let code = code?.lowercased(),
      let countryCode = CountryEnum(rawValue: code) else { return }
    
    setCoutryFlag(with: countryCode)
  }
  
  func setCoutryFlag(with code: CountryEnum) {
    let imageView = UIImageView(
      frame: CGRect(x: leftViewPadding, y: 0, width: widthOfImageInLeftView, height: frame.height)
    )
    
    imageView.contentMode = .scaleAspectFit
    imageView.image = code.flag
    
    let label = UILabel()
    label.font = font ?? UIFont.systemFont(ofSize: 14)
    label.textColor = textColor ?? .black
    label.text = code.phoneCode
    
    label.frame = CGRect(
      x: leftViewPadding + widthOfImageInLeftView + leftViewPadding,
      y: 0,
      width: label.intrinsicContentSize.width,
      height: frame.height
    )
    
    let paddingView = UIView(
      frame: CGRect(
        x: 0,
        y: 0,
        width: leftViewPadding + label.intrinsicContentSize.width + widthOfImageInLeftView + leftViewPadding,
        height: frame.height
      )
    )
    
    paddingView.addSubview(imageView)
    paddingView.addSubview(label)
    paddingView.backgroundColor = .clear
    
    leftViewMode = .always
    leftView = paddingView
  }
}

extension Reactive where Base: UITextField {
  public func filterBy(_ type: GMEKeyboardType, isUppercase: Bool = false) -> Disposable {
    let disposable = self.base.rx.controlEvent(.editingChanged)
      .subscribe(onNext: {
        self.base.filterBy(type: type, isUppercase: isUppercase)
      })
    return disposable
  }
  
  public func filterBy(_ regex: String) -> Disposable {
    let disposable = self.base.rx.controlEvent(.editingChanged)
      .subscribe(onNext: {
        self.base.filterBy(regex: regex)
      })
    return disposable
  }
}