//
//  ExchangeRateViewController.swift
//  GMERemittance
//
//  Created by FMI-12 on 2/1/18.
//  Copyright © 2018 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit

class ExchangeRateViewController: UIViewController {
    
    @IBOutlet weak var textFieldKorea: UITextField!
    @IBOutlet weak var textFieldOtherCountries: UITextField!
    @IBOutlet weak var toUnitLabel: UILabel!
    @IBOutlet weak var fromKoreaLabelOutlet: UILabel!
    @IBOutlet weak var toOtherLabelOutlet: UILabel!
    @IBOutlet weak var sendMoneyButtonOutlet: UIButton!
    @IBOutlet weak var flagImageOutlet: UIImageView!
    
    private var exchangerateviewmodel = ExchangeRateViewModel()
    private var exchangeRateDataObject = ExchangeRateData()
    
    @IBOutlet weak var viewContainWithKoreanCurrency: UIView!
    @IBOutlet weak var viewContainWithOtherCountryCurrency: UIView!
    
    private var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()
    public var exchangeRateData: [String:Any]?
    
    var transferLimit: Double?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setUpNavBar(id: 201, title: "Today's Rate")
        setUpAnotherLoginListener(genericviewmodel: exchangerateviewmodel)
        
        setExchangeRateUIValues()
        
        textFieldKorea.attributedPlaceholder = NSAttributedString(string: "0",
                                                                  attributes: [NSAttributedStringKey.foregroundColor: UIColor(red:0.93, green:0.11, blue:0.14, alpha:1.0)])
        textFieldOtherCountries.attributedPlaceholder = NSAttributedString(string: "0",
                                                                           attributes: [NSAttributedStringKey.foregroundColor: UIColor(red:0.93, green:0.11, blue:0.14, alpha:1.0)])
        
        /**
         tap
         */
        let tap = UITapGestureRecognizer(target: self, action: #selector(handleTapKoreanCurrencyView))
        tap.delegate = self as? UIGestureRecognizerDelegate
        viewContainWithKoreanCurrency.addGestureRecognizer(tap)
        
        let tapOtherView = UITapGestureRecognizer(target: self, action: #selector(handleTapOtherCountryCurrencyView))
        tap.delegate = self as? UIGestureRecognizerDelegate
        viewContainWithOtherCountryCurrency.addGestureRecognizer(tapOtherView)
        
        exchangerateviewmodel.exchangeRateConnectionTimeOut.value = nil
        /**
         connection timeout
         */
        exchangerateviewmodel.exchangeRateConnectionTimeOut.bind { [unowned self] in
            guard $0 != nil else {
                return
            }
            self.stopLoading()
            self.popUpMessage(value: 20)
        }
        
        
        /**
         Check internet connection
         */
        exchangerateviewmodel.internetConnection.value = nil
        exchangerateviewmodel.internetConnection.bind { [unowned self] in
            guard $0 != nil else {
                return
            }
            self.stopLoading()
            self.popUpMessage(value: 15)
        }
        
        /**
         Request an api to calculate conversion amount.
         */
        exchangerateviewmodel.exchangeRateAvailable.bind { [unowned self] in
            guard $0 != nil else {
                return
            }
            self.stopLoading()
            guard $0! else {
                self.popUpMessageError(value: 10, message: (self.exchangerateviewmodel.getErrorMessage()))
                return
            }
            self.stopLoading()
            self.setExchangeRateDataObject()
        }
    }
    
    /**
     Handle tap action in view
     */
    @objc func handleTapKoreanCurrencyView(){
        textFieldKorea.becomeFirstResponder()
    }
    
    /**
     Handle tap action in view
     */
    @objc func handleTapOtherCountryCurrencyView(){
        textFieldOtherCountries.becomeFirstResponder()
    }
    
    /**
     Get conversion unit amount.
     */
    func setExchangeRateDataObject(){
        self.exchangeRateDataObject = exchangerateviewmodel.getExchangeRateData()
        setExchangeRateUIValuesFromApi()
    }
    
    /**
     Updated UI with conversion amount.
     */
    func setExchangeRateUIValuesFromApi(){
        textFieldOtherCountries.text = "\(self.exchangeRateDataObject.pAmt!) "
        textFieldKorea.text = "\(self.exchangeRateDataObject.cAmt!)"
        if let currentRate = self.exchangeRateDataObject.currentRate,let unit = self.exchangeRateData!["currencyUnit"]  {
            toOtherLabelOutlet.text = "\(currentRate ) \(unit as! String)"
        }
    }
    
    /**
     Set 1KRW unit conversion value as per country selected
     */
    func setExchangeRateUIValues(){
        if let amount = self.exchangeRateData!["toAmountAndUnit"],
            let unit = self.exchangeRateData!["currencyUnit"] {
            toOtherLabelOutlet.text = "\(amount as! String) \(unit as! String)"
            toUnitLabel.text = unit as? String
        }
        if  let url: String = self.exchangeRateData!["flagUrl"]! as? String{
            self.downloadImage(url: Foundation.URL(string:url)!)
        }
    }
    
    /**
     - parameter exchangeType: exchangeType is Korea or other countries (if korea calcBy = "C" else "P")
     - parameter amount: amount type by user
     
     - returns: dictionary object for api reqeust as a parameter 
     */
    func exchangeRateBody(exchangeType: String,amount:String) -> [String:Any]{
        var exchangedata = [String:Any]()
        if exchangeType == "Korea"{
            exchangedata = ["from":"KRW",
                            "to":self.exchangeRateData!["currencyUnit"] as! String,
                            "calcBy":"C",
                            "cAmt":amount,
                            "payoutmethodId":self.exchangeRateData!["payoutmethodId"] as! String ,
                            "countryId":self.exchangeRateData!["countryId"] as! String ,
                            "sendMoney": false
            ]
        }else if exchangeType == "Other"
        {
            exchangedata = ["from":"KRW",
                            "to":self.exchangeRateData!["currencyUnit"] as! String,
                            "calcBy":"P",
                            "pAmt":amount,
                            "payoutmethodId":self.exchangeRateData!["payoutmethodId"] as! String ,
                            "countryId":self.exchangeRateData!["countryId"] as! String ,
                            "sendMoney": false
            ]
        }
        return exchangedata
    }
    
    /**
     Disable user interaction while fetching data from api
     */
    func startLoading(){
        self.showActivityIndicator(activityIndicator: self.activityIndicator)
        self.disableUserInteractions()
    }
    
    /**
     Enable user interaction while fetching data from api
     */
    func stopLoading(){
        self.dismissActivityIndicator(activityIndicator: self.activityIndicator)
        self.enableUserInteractions()
    }
    
    func addDoneButtonOnKeyboard(textField: UITextField)
    {
        let doneToolbar: UIToolbar = UIToolbar(frame: CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 50))
        doneToolbar.barStyle = .default
        
        let flexSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        
        var done = UIBarButtonItem()
        var cancel = UIBarButtonItem()
        
        if textField == textFieldKorea{
            done = UIBarButtonItem(title: "Calculate", style: .done, target: self, action: #selector(self.doneButtonActionKorea))
            cancel = UIBarButtonItem(title: "Cancel", style: .done, target: self, action: #selector(self.cancelButtonActionKorea))
            cancel.tintColor = UIColor.black
        }else{
            done = UIBarButtonItem(title: "Calculate", style: .done, target: self, action: #selector(self.doneButtonActionOther))
            cancel = UIBarButtonItem(title: "Cancel", style: .done, target: self, action: #selector(self.cancelButtonActionOther))
            cancel.tintColor = UIColor.black
        }
        
        done.tintColor = UIColor(hex: 0xED1C24)
        let items = [cancel,flexSpace, done]
        doneToolbar.items = items
        doneToolbar.sizeToFit()
        
        self.textFieldKorea.inputAccessoryView = doneToolbar
        self.textFieldOtherCountries.inputAccessoryView = doneToolbar
    }
    
    @objc func cancelButtonActionKorea(){
        self.textFieldKorea.text = "0"
        self.textFieldKorea.resignFirstResponder()
    }
    
    @objc func cancelButtonActionOther(){
        self.textFieldOtherCountries.text = "0"
        self.textFieldOtherCountries.resignFirstResponder()
    }
    
    /**
     When user want to calculater other currency from Korean currency
     */
    @objc func doneButtonActionKorea(){
        textFieldKorea.resignFirstResponder()
        if (textFieldKorea.text != "0" && textFieldKorea.text != ""){
            self.startLoading()
            exchangerateviewmodel.fetchExchangeRate(exchangeData: exchangeRateBody(exchangeType: "Korea", amount: textFieldKorea.text!))
        }
    }
    
    /**
     When user want to calculater Korean currency from Other currency
     */
    @objc func doneButtonActionOther(){
        textFieldOtherCountries.resignFirstResponder()
        if (textFieldOtherCountries.text != "0" && textFieldOtherCountries.text != ""){
            self.startLoading()
            exchangerateviewmodel.fetchExchangeRate(exchangeData: exchangeRateBody(exchangeType: "Other", amount: textFieldOtherCountries.text!))
        }
    }
    
    func getDataFromUrl(url: URL, completion: @escaping (Data?, URLResponse?, Error?) -> ()) {
        URLSession.shared.dataTask(with: url) { data, response, error in
            completion(data, response, error)
            }.resume()
    }
    
    /**
     - parameter url: set image url into imageview
     */
    func downloadImage(url: URL) {
        getDataFromUrl(url: url) { data, response, error in
            guard let data = data, error == nil else { return }
            DispatchQueue.main.async() {
                self.flagImageOutlet.image = UIImage(data: data)
            }
        }
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
    /**
     Redirect to RecipientListViewController
     */
    @IBAction func sendMoney(_ sender: Any) {
        if (UserDefaults.standard.object(forKey: "com.gmeremit.isVerified") as! Bool) {
            let storyboard = UIStoryboard.init(name: "RecipientListViewController", bundle: Bundle.main)
            let vController = storyboard.instantiateViewController(withIdentifier: "RecipientListViewController") as! RecipientListViewController
            self.navigationController!.pushViewController(vController, animated: true)
        } else {
            popUpMessage(value: 13)
        }
    }
}


extension ExchangeRateViewController: UITextFieldDelegate {
    func textFieldDidBeginEditing(_ textField: UITextField) {
        self.sendMoneyButtonOutlet.isHidden = true
        if textField == textFieldKorea{
            self.addDoneButtonOnKeyboard(textField: textFieldKorea)
        }else if textField == textFieldOtherCountries{
            self.addDoneButtonOnKeyboard(textField: textFieldOtherCountries)
        }
    }
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        self.sendMoneyButtonOutlet.isHidden = true
        if textField == textFieldKorea{
            textFieldOtherCountries.text = ""
        }else{
            textFieldKorea.text = ""
        }
        let inputText = (textField.text! as NSString).replacingCharacters(in: range, with: string)
        
        let currentText = textField.text ?? ""
        guard let stringRange = Range(range, in: currentText) else { return false }
        
        let updatedText = currentText.replacingCharacters(in: stringRange, with: string)
        
        if updatedText.count != 0 {
            if textField == textFieldKorea {
                if inputText.isDouble() {
                    if let transferAmount = transferLimit {
                        if Double(inputText)! <= transferAmount{
                            return true
                        } else {
                            return false
                        }
                    }
                }
            } else {
                if inputText.isDouble() {
                    if Double(inputText)! <= 999999999999999.00 {
                        return true
                    } else {
                        return false
                    }
                }
            }
        }
        return true
    }
    
    
    
    func textFieldDidEndEditing(_ textField: UITextField) {
        self.sendMoneyButtonOutlet.isHidden = false
    }
}