LONDON-IOS/GMERemittance/Module/RewardModules/Reward/User Interface/View/RewardViewController.swift

//
//  RewardViewController.swift
//  GME Remit
//
//  Created by InKwon Devik Kim on 11/04/2019.
//Copyright © 2019 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit

class RewardViewController: UIViewController {
    
    // MARK: Properties
    
    var presenter: RewardModuleInterface?
    
    private var models: [RewardProduct]? {
        didSet {
            self.collectionView.reloadData()
        }
    }
    
    private var rewardPoint: String? {
        didSet {
            self.rewardPointLabel.text = self.rewardPoint
        }
    }
    
    private lazy var refreshControl = UIRefreshControl()
    // MARK: IBOutlets
    
    @IBOutlet weak var collectionView: UICollectionView!
    @IBOutlet weak var rewardPointLabel: UILabel!
    
    
    // MARK: VC's Life cycle
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.setup()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationItem.title = "Reward"
        self.presenter?.viewIsReady()
        self.rewardPoint = UserDefaults.standard.string(forKey: UserKeys.rewardPoint)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        self.navigationItem.title = ""
    }
    // MARK: IBActions
    
    @IBAction func closeButtonTouch(_ sender: UIBarButtonItem) {
        self.dismiss(animated: true, completion: nil)
    }
    
    // MARK: Other Functions
    
    private func setup() {
        // all setup should be done here
        self.setDelegate()
        self.setCollectionViewLayout()
        self.addRefreshControlCollectionView()
    }
    
    private func setDelegate(){
        self.collectionView.delegate = self
        self.collectionView.dataSource = self
    }
    
    private func setCollectionViewLayout() {
        let cellSize = CGSize(
            width: (self.view.frame.width - 20) / 2 - 3.5,
            height: (self.view.frame.width - 20) / 2 - 3.5
        )
        
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .vertical
        layout.itemSize = cellSize
        layout.sectionInset = UIEdgeInsets(top: 1, left: 1, bottom: 1, right: 1)
        layout.minimumLineSpacing = 5.0
        layout.minimumInteritemSpacing = 5.0
        
        self.collectionView.setCollectionViewLayout(layout, animated: true)
        self.collectionView.reloadData()
    }
    
    private func addRefreshControlCollectionView() {
        let colorOption = [NSAttributedStringKey.foregroundColor : AppConstants.themWhiteColor];
        
        let title = NSAttributedString(string: "pull to refresh", attributes: colorOption)
        
        self.refreshControl.attributedTitle = title
        self.refreshControl.backgroundColor = AppConstants.themeBlueColor
        self.refreshControl.tintColor = AppConstants.themWhiteColor
        self.refreshControl.addTarget(self, action: #selector(self.refresh), for: .valueChanged)
        if #available(iOS 10.0, *) {
            self.collectionView.refreshControl = self.refreshControl
        } else {
            self.collectionView.addSubview(self.refreshControl)
        }
    }
    
    @objc
    private func refresh() {
        self.presenter?.viewIsReady()
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0){
            if #available(iOS 10.0, *) {
                self.collectionView.refreshControl?.endRefreshing()
            } else {
                self.refreshControl.endRefreshing()
            }
        }
    }
    
}

// MARK: RewardViewInterface
extension RewardViewController: RewardViewInterface {
    func setRewardProducts(models: [RewardProduct]?) {
        self.models = models
    }
    
    func failure(error: Error) {
        self.alertWithOk(message: error.localizedDescription)
    }
    
    func goRedeemViewController(with model: RewardProduct?) {
        self.presenter?.goRedeemViewController(with: model)
    }
    
    func startLoading() {
        self.showProgressHud()
    }
    
    func endLoading() {
        self.hideProgressHud()
    }
}


extension RewardViewController: UICollectionViewDelegate {
    
}

extension RewardViewController: UICollectionViewDataSource {
    func collectionView(
        _ collectionView: UICollectionView,
        numberOfItemsInSection section: Int
    ) -> Int {
        return self.models?.count ?? 0
    }
    
    func collectionView(
        _ collectionView: UICollectionView,
        cellForItemAt indexPath: IndexPath
    ) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(
            withReuseIdentifier: "RewardItemCollectionViewCell",
            for: indexPath
        ) as! RewardItemCollectionViewCell
        
        cell.setModel(with: self.models?[indexPath.row], delegate: self)
        
        return cell
    }
}