LONDON-IOS/GMERemittance/Module/SendMoney/SendMoneyParent/User Interface/View/SendMoneyParentViewController.swift

//
//  SendMoneyParentViewController.swift
//  GMERemittance
//
//  Created by gme_2 on 28/08/2018.
//Copyright © 2018 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit
import Localize_Swift

// controls the progress hud of parent view from child view
protocol HUDStatusDelegate {
    func showLoading()
    func hideLoading()
}

// Actions from SendMoneyPaymentModeViewController are delegated to parent view
protocol SendMoneyPaymentModeActionDelegate {
    func selected(bank: SendMoneyBank?)
    func selected(branch: SendMoneyBankBranch?)
    func selected(payoutMethod: SendMoneyPayoutMode?)
    func added(acountNumber: String)
    func continueToExchangeAction()
}

// Actions from SendMoneyExchangeRateViewController are delegated to Parent View
protocol SendMoneyExchangeRateActionDelegate {
    func continueToVerificationAction()
    func calculated(model: SendMoneyExchangeRateModel?)
}

// A model encapsulating all field required to make the api request for send money
class SendMoneyRequestModel {
    var paymemtMode: SendMoneyPayoutMode?
    var bank: SendMoneyBank?
    var branch: SendMoneyBankBranch?
    var accountNumber: String?
    var payingAmount: String?
    var exchangeRateDetail: SendMoneyExchangeRateModel?
    var transactionPassword: String?
    var autoDebitAccount: Account?
}


class SendMoneyParentViewController: UIViewController {
    
   private enum StateButtons: Int {
        case paymentMode = 1
        case exchange = 2
        case verification = 3
    }
    
   private struct Constants {
        static let stateRedColor = UIColor.init(hex: "#EC1C24")
        static let stateGreenColor = AppConstants.themeBlueColor
        static let stateLabelGreyColor = UIColor.init(hex: "4a4a4a")
    }
    
    private struct StringConstants {
        let payoutModeText = "payout_mode_text".localized()
        let amountDetailText = "amount_detail_text".localized()
        let verificationDetailText = "verification_detail_text".localized()
    }
    
    // MARK: IBOutlets
    // Container view holds the child view controllers
    // There are three child view controllers.
    // 1. SendMoneyPaymentModeViewController
    // 2. SendMoneyExchangeRateViewController
    // 3. SendMoneyVerificationViewController
    
    @IBOutlet weak var containerView: UIView!
    @IBOutlet weak var paymentModeButton: UIButton!
    @IBOutlet weak var exchangeRateButton: UIButton!
    @IBOutlet weak var verificationButton: UIButton!
    @IBOutlet weak var paymentModeLabel: UILabel!
    @IBOutlet weak var exchangeRateLabel: UILabel!
    @IBOutlet weak var verificationLabel: UILabel!
    
    
    
    // MARK: Properties
    var SendMoneyPaymentModeViewController: UIViewController?
    var SendMoneyExchangeRateViewController: UIViewController?
    var SendMoneyVerificationViewController: UIViewController?
    
    var requestModel: SendMoneyRequestModel?
    
    var presenter: SendMoneyParentModuleInterface?
    
    // Buttons representing the pages marked as 1, 2, 3 in UI.
    var stateButtons: [UIButton] = []
    
    private var state: StateButtons = .paymentMode {
        didSet {
            self.updateState(state: state)
        }
    }
    var receipient: Recipient?
    
    var account: Account? {
        didSet {
            self.requestModel?.autoDebitAccount = account
        }
    }
    
    // MARK: VC's Life cycle
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.setup()
        self.presenter?.viewIsReady()
        self.setupViewControllers()
        self.addPaymentModeViewController()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        setTitle(title: "send_money_text".localized())
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        self.navigationItem.title = ""
    }
    
    // MARK: IBActions
    
    @IBAction func paymentMode(_ sender: UIButton) {
        self.addPaymentModeViewController()
        self.state = StateButtons.paymentMode
    }
    
    @IBAction func exchangeRate(_ sender: UIButton) {
        self.addExchangeViewController()
        self.state = StateButtons.exchange
    }
    
    @IBAction func verification(_ sender: UIButton) {
        self.addVerificationViewController()
        self.state = StateButtons.verification
    }
    
    // MARK: Other Functions

    private func setup() {
        // all setup should be done here
        self.setTitle(title: "send_money_text".localized())
        self.state = StateButtons.paymentMode
        self.configureViews()
        self.requestModel = SendMoneyRequestModel()
        configureLanguage()
    }
    
    private func configureLanguage() {
        self.paymentModeLabel.text = StringConstants().payoutModeText
        self.exchangeRateLabel.text = StringConstants().amountDetailText
        self.verificationLabel.text = StringConstants().verificationDetailText
    }
    
    private func setTitle(title: String) {
        self.navigationItem.title = title
    }
    
    private func setupViewControllers() {
        let paymentModelWireframe = SendMoneyPaymentModeWireframe()
        let pvc  = paymentModelWireframe.getMainView() as! SendMoneyPaymentModeViewController
        pvc.recipient = self.receipient
        pvc.hudDelegate = self
        pvc.actionDelegate = self
        self.SendMoneyPaymentModeViewController = pvc
        
        let exchangeViewWireframe = SendMoneyExchangeRateWireframe()
        let evc =  exchangeViewWireframe.getMainView() as! SendMoneyExchangeRateViewController
        evc.reciepient = self.receipient
        evc.actionDelegate = self
        evc.hudDelegate = self
        self.SendMoneyExchangeRateViewController = evc
        
        let verificationWireframe = SendMoneyVerificationWireframe()
        let vvc = verificationWireframe.getMainView() as! SendMoneyVerificationViewController
        vvc.reciepient = self.receipient
        vvc.requestModel = self.requestModel
        vvc.hudDelegate = self
         self.SendMoneyVerificationViewController = vvc
    }

    private func configureViews() {
        self.paymentModeButton.tag = 1
        self.exchangeRateButton.tag = 2
        self.verificationButton.tag = 3
         self.stateButtons = [paymentModeButton,exchangeRateButton, verificationButton ]
        [paymentModeButton, exchangeRateButton, verificationButton].forEach({
            $0?.rounded()
        })
    }
    
    private func updateState(state: StateButtons) {
        switch state {
        case .paymentMode:
            // buttons
            self.paymentModeButton.backgroundColor = Constants.stateGreenColor
            self.exchangeRateButton.backgroundColor = Constants.stateRedColor
            self.verificationButton.backgroundColor = Constants.stateRedColor
            
            self.exchangeRateButton.isUserInteractionEnabled = false
            self.verificationButton.isUserInteractionEnabled = false
            
            // labels
            self.paymentModeLabel.textColor = Constants.stateGreenColor
            self.exchangeRateLabel.textColor = Constants.stateLabelGreyColor
            self.verificationLabel.textColor = Constants.stateLabelGreyColor
            self.requestModel?.bank = nil
            self.requestModel?.branch = nil
            
        case .exchange:
            // buttons
            self.paymentModeButton.backgroundColor = Constants.stateGreenColor
            self.exchangeRateButton.backgroundColor = Constants.stateGreenColor
            self.verificationButton.backgroundColor = Constants.stateRedColor
            
            self.exchangeRateButton.isUserInteractionEnabled = true
            self.verificationButton.isUserInteractionEnabled = false
            
            // labels
            self.paymentModeLabel.textColor = Constants.stateLabelGreyColor
            self.exchangeRateLabel.textColor = Constants.stateGreenColor
            self.verificationLabel.textColor = Constants.stateLabelGreyColor
            
        case .verification:
            
            // button
            self.paymentModeButton.backgroundColor = Constants.stateGreenColor
            self.exchangeRateButton.backgroundColor = Constants.stateGreenColor
            self.verificationButton.backgroundColor = Constants.stateGreenColor
            self.exchangeRateButton.isUserInteractionEnabled = true
            
            // labels
            self.paymentModeLabel.textColor = Constants.stateLabelGreyColor
            self.exchangeRateLabel.textColor = Constants.stateLabelGreyColor
            self.verificationLabel.textColor = Constants.stateLabelGreyColor
        }
    }

    // Make SendMoneyPaymentModeViewController as front View Controller
   private func addPaymentModeViewController() {
        guard let paymentModeViewController = self.SendMoneyPaymentModeViewController else {return}
        self.addChildViewController(paymentModeViewController)
        UIView.transition(with: self.containerView, duration: 0.33, options: .transitionCrossDissolve, animations: {
            self.containerView.addSubview(paymentModeViewController.view)
        }, completion: nil)
        paymentModeViewController.view.frame = containerView.bounds
        paymentModeViewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        paymentModeViewController.didMove(toParentViewController: self)
    }
    
    // Make SendMoneyPaymentModeViewController as front View Controller
   private func addExchangeViewController() {
        guard let exchangeViewController = self.SendMoneyExchangeRateViewController as? SendMoneyExchangeRateViewController else {return}
        exchangeViewController.requestModel = self.requestModel
        exchangeViewController.actionDelegate = self
        self.addChildViewController(exchangeViewController)
        UIView.transition(with: self.containerView, duration: 0.33, options: .transitionCrossDissolve, animations: {
            self.containerView.addSubview(exchangeViewController.view)
        }, completion: nil)
        exchangeViewController.view.frame = containerView.bounds
        exchangeViewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        exchangeViewController.didMove(toParentViewController: self)
    }
    
    //  Make SendMoneyExchangeRateViewController as front View Controller
   private func addVerificationViewController() {
        guard let verificationViewController = self.SendMoneyVerificationViewController as? SendMoneyVerificationViewController else {return}
        verificationViewController.reciepient = self.receipient
        verificationViewController.requestModel = self.requestModel
        self.addChildViewController(verificationViewController)
        UIView.transition(with: self.containerView, duration: 0.33, options: .transitionCrossDissolve, animations: {
            self.containerView.addSubview(verificationViewController.view)
        }, completion: nil)
        verificationViewController.view.frame = containerView.bounds
        verificationViewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        verificationViewController.didMove(toParentViewController: self)
    }
}

// MARK: SendMoneyParentViewInterface
extension SendMoneyParentViewController: SendMoneyParentViewInterface {
    func show(model: Recipient) {
        self.receipient = model
    }
    
    func show(model: Account) {
        self.account = model
    }
}

extension SendMoneyParentViewController: HUDStatusDelegate {
    func showLoading() {
        self.showProgressHud()
    }
    
    func hideLoading() {
        self.hideProgressHud()
    }
}

extension SendMoneyParentViewController: SendMoneyPaymentModeActionDelegate {
    func selected(bank: SendMoneyBank?) {
        self.requestModel?.bank = bank
    }
    
    func selected(branch: SendMoneyBankBranch?) {
        self.requestModel?.branch = branch
    }
    
    func selected(payoutMethod: SendMoneyPayoutMode?) {
        self.requestModel?.paymemtMode = payoutMethod
    }
    
    func continueToExchangeAction() {
        self.addExchangeViewController()
        self.state = StateButtons.exchange
        
    }
    
    func added(acountNumber: String) {
        self.requestModel?.accountNumber = acountNumber
    }
}

extension SendMoneyParentViewController: SendMoneyExchangeRateActionDelegate {
    func continueToVerificationAction() {
        self.addVerificationViewController()
        self.state = StateButtons.verification
    }
    
    func calculated(model: SendMoneyExchangeRateModel?) {
        self.requestModel?.exchangeRateDetail = model
    }
}