Language.swift

//
//  Language.swift

//
//  Created by Terry Chen on 2017/12/19.

//

import UIKit

//MARK:- protocol LanguageProtocol
protocol LanguageProtocol {
    static var allLanguages: [Language] { get }
    var title: String                   { get }
    var langCode: String                { get }
    var flagImage: UIImage?             { get }
    var preferredLang: String           { get }
}

//MARK:- enum Language
enum Language: String {
    case en, `in`, id, ja, km, ko, pt, th, vi, zh
}

//MARK:- Implement Language protocol
extension Language: LanguageProtocol {
    
    static let allLanguages: [Language] = [.en, .id, .ja, .km, .ko, .pt, .th, .vi, .zh]
    
    var title: String {
        switch self {
        case .en    :  return "English"
        case .`in`  :  return "Indo"
        case .id    :  return "Indo"
        case .ja    :  return "日本語"
        case .km    :  return "ភាសាខ្មែរ"
        case .ko    :  return "한국어"
        case .pt    :  return "Português"
        case .th    :  return "ไทย"
        case .vi    :  return "Tiếng Việt"
        case .zh    :  return "简体"
        }
    }
    
    var langCode: String {
        return rawValue
    }
    
    var preferredLang: String {
        switch self {
        case .en    :  return LOCALE_EN
        case .`in`  :  return LOCALE_IN
        case .id    :  return LOCALE_ID
        case .ja    :  return LOCALE_JA
        case .km    :  return LOCALE_KM
        case .ko    :  return LOCALE_KO
        case .pt    :  return LOCALE_PT
        case .th    :  return LOCALE_TH
        case .vi    :  return LOCALE_VI
        case .zh    :  return LOCALE_ZH
        }
    }
    
    var flagImage: UIImage? {
        return UIImage(named: flagImageName)
    }
}

//MARK:- Extension private property
extension Language {
    private var flagImageName: String {
        switch self {
        case .en    :  return "csh_ic_uk"
        case .`in`  :  return "csh_ic_indonesia"
        case .id    :  return "csh_ic_indonesia"
        case .ja    :  return "csh_ic_japan"
        case .km    :  return "csh_ic_cambodia"
        case .ko    :  return "csh_ic_korea"
        case .pt    :  return "csh_ic_brazil"
        case .th    :  return "csh_ic_thailand"
        case .vi    :  return "csh_ic_vietnam"
        case .zh    :  return "csh_ic_china"
        }
    }
}

// MARK:- Implement Language property on String

extension String {

    var flagImage: UIImage {
        return toLanguage?.flagImage ?? String.defaultLanguage.flagImage
    }
    
    var languageTitle: String {
        return toLanguage?.title ?? String.defaultLanguage.languageTitle
    }
    
    static var defaultLanguage: String {
        return "en"
    }
    
    private var toLanguage: Language? {
        return Language(rawValue: self)
    }
}