LONDON-IOS/GMERemittance/Exchange Rate/ExchangeRateViewModel.swift

//
//  ExchangeViewModel.swift
//  GMERemittance
//
//  Created by FMI-12 on 2/4/18.
//  Copyright © 2018 Gobal Money Express Co. Ltd. All rights reserved.
//

import Foundation

class ExchangeRateViewModel: ModelExtension {
    
    var exchangeRateAvailable: Box<Bool?> = Box(nil)
    var currencyInfoAvailable: Box<Bool?> = Box(nil)
    
    var exchangeRateConnectionTimeOut: Box<Bool?> = Box(nil)
    
    var currenciesData = [CurrenciesData]()
    var exchangeRateData: ExchangeRateData?
    
    private var exchangeRate: Float = 0.0
    private var transferLimit: Double = 0.0
    
    let userId = UserDefaults.standard.object(forKey: "com.gmeremit.username") as? String
    
    /**
        To get currency
     - parameter currencyInfo: currency info
     */
    func fetchCurrencies(currencyInfo: [String: String]){

        if !Reachability.isConnectedToNetwork() {
            self.internetConnection.value = false
        } else {
            self.currenciesData.removeAll()
            RestApiMananger.sharedInstance.getCurrencies(param: currencyInfo) { result in
                switch result {
                case let .success(currencyJSON):
                    if currencyJSON.count > 0 {
                        for i in 0 ... (currencyJSON.count-1) {
                            do {
                                let currencyDetail = try JSONDecoder().decode(CurrenciesData.self, from: currencyJSON[i].rawData())
                                self.currenciesData.append(currencyDetail)
                            } catch let err {
                                self.setErrorMessage(message: err as! String)
                                self.currencyInfoAvailable.value = false
                            }
                        }
                    }
                    self.currencyInfoAvailable.value = true
                case let .failure(errorJSON):
                    self.setErrorMessage(message: errorJSON["message"].stringValue)
                    self.currencyInfoAvailable.value = false
                case .updateAccessCode:
                    RestApiMananger.sharedInstance.updateAccessCode(userId: self.userId!, password: self.getLoginPassword()) {
                        result in
                        if result != "Error"{
                            let uuid = RestApiMananger.sharedInstance.getUUID()
                            UserDefaults.standard.set((result + ":" + uuid).toBase64(), forKey: "com.gmeremit.accessCode")
                            self.fetchCurrencies(currencyInfo: currencyInfo)
                        }
                    }
                case .logOutUser():
                    RestApiMananger.sharedInstance.cancelExistingNetworkCalls()
                    self.anotherLogin.value = true
                case .timeOut:
                    self.exchangeRateConnectionTimeOut.value = false
                }
            }
        }
    }
    
    /**
        To get exchange rate
     - parameter exchangeData: exchange data  in dictionary[:] datatype
     */
    func fetchExchangeRate(exchangeData: [String: Any]) {
        if !Reachability.isConnectedToNetwork() {
            self.internetConnection.value = false
        } else {
            var exchangeRate = ExchangeRateData()
            RestApiMananger.sharedInstance.getExchangeRates(param: exchangeData) { result in
                switch result {
                case let .success(exchangeRateJSON):
                    do {
                         exchangeRate = try JSONDecoder().decode(ExchangeRateData.self, from: exchangeRateJSON.rawData())
                        self.exchangeRateData = exchangeRate
                    } catch {
                       
                        self.exchangeRateAvailable.value = false
                    }
                    self.exchangeRateAvailable.value = true
                case let .failure(errorJSON):
                    self.setErrorMessage(message: errorJSON["message"].stringValue)
                   
                    self.exchangeRateAvailable.value = false
                case .updateAccessCode:
                    RestApiMananger.sharedInstance.updateAccessCode(userId: self.userId!, password: self.getLoginPassword()) {
                        result in
                        if result != "Error"{
                            let uuid = RestApiMananger.sharedInstance.getUUID()
                            UserDefaults.standard.set((result + ":" + uuid).toBase64(), forKey: "com.gmeremit.accessCode")
                            self.fetchExchangeRate(exchangeData: exchangeData)
                        }
                    }
                case .logOutUser():
                    RestApiMananger.sharedInstance.cancelExistingNetworkCalls()
                    self.anotherLogin.value = true
                case .timeOut:
                    self.exchangeRateConnectionTimeOut.value = false
                }
            }
        }
    }
    
    
    /**
        To get exchange rate
     - returns: ExchangeRateData
     */
    func getExchangeRateData() -> ExchangeRateData{
        if self.exchangeRateData != nil{
            return self.exchangeRateData!
        }
        return ExchangeRateData()
    }
    
    /**
     To get currencies
     - returns: currencies data list
     */
    func getCurrencies() -> [CurrenciesData]{
        return self.currenciesData
    }
    
    /**
     To get currencies exchange rate in terms of KRW
     - parameter krw: krw amount
     - returns: exchange rate
     */
    func getKRWtoOtherCurrency(krw: Float) -> Float {
        return krw * exchangeRate
    }
    
}