LONDON-IOS/GME Remit/Modules/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
import XLPagerTabStrip

class RewardViewController: UIViewController {
  
  // MARK: Properties
  
  var presenter: RewardModuleInterface?
  
  private var models: [RewardProduct]? {
    didSet {
      collectionView.reloadData()
    }
  }
  
  private var rewardPoint: String? {
    didSet {
      rewardPointLabel.text = rewardPoint
    }
  }
  
  private lazy var refreshControl = UIRefreshControl()
  // MARK: IBOutlets
  
  @IBOutlet weak var collectionView: UICollectionView!
  @IBOutlet weak var rewardPointLabel: UILabel!
  @IBOutlet weak var rewardPointTitleLabel: UILabel!
  @IBOutlet weak var rewardNoteLabel: UILabel!
  @IBOutlet weak var rewardPointContainerView: UIView!
  @IBOutlet weak var layoutSegment: UISegmentedControl!
  
  // MARK: VC's Life cycle
  
  override func viewDidLoad() {
    super.viewDidLoad()
    setup()
    
    layoutSegment.addTarget(self, action: #selector(selectLayout(_:)), for: .valueChanged)
  }
  
  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    title = "reward_group_title_text".localized()
    
    collectionView.setContentOffset(.zero, animated: false)
    rewardPoint = GMEDB.shared.user.string(.rewardPoint)?.likeCommaMoney()
    
    collectionView.reloadData()
  }
  
  override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    navigationItem.title = ""
  }
  // MARK: IBActions
  
  @objc func selectLayout(_ sender: UISegmentedControl) {
    setCollectionViewLayout(sender.selectedSegmentIndex)
  }
  
  // MARK: Other Functions
  
  private func setup() {
    // all setup should be done here
    setDelegate()
    setCollectionViewLayout(0)
    addRefreshControlCollectionView()
    setMultiLanguage()
    rewardPointContainerView.hero.id = "pointsView"
    presenter?.viewIsReady()
    
    layoutSegment.tintColor = .themeRed
    layoutSegment.backgroundColor = .clear
    
    collectionView.layer.cornerRadius = 5
  }
  
  private func setDelegate() {
    collectionView.dataSource = self
  }
  
  private func setMultiLanguage() {
    rewardPointTitleLabel.text = "reward_points_text".localized()
    rewardNoteLabel.text = "reward_note_text".localized()
  }
  
  private func setCollectionViewLayout(_ type: Int) {
    let width: CGFloat
    let height: CGFloat
    
    switch type {
    case 0:
      width = (view.frame.width - 30) / 2 - 3.5
      height = (view.frame.width - 30) / 2 - 3.5 + 30
    case 1:
      width = (view.frame.width - 30)
      height = (( width * 260 ) / 320) + 5
      
    default:
      width = (view.frame.width - 30) / 2 - 3.5
      height = (view.frame.width - 30) / 2 - 3.5 + 30
    }
    
    let cellSize = CGSize(
      width: width,
      height: height
    )
    
    let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .vertical
    layout.itemSize = cellSize
    layout.sectionInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
    layout.minimumLineSpacing = 5.0
    layout.minimumInteritemSpacing = 5.0
    
    collectionView.setCollectionViewLayout(layout, animated: true)
    collectionView.reloadData()
    collectionView.collectionViewLayout.invalidateLayout()
  }
  
  private func addRefreshControlCollectionView() {
    let colorOption = [NSAttributedString.Key.foregroundColor : UIColor.themeWhite]
    
    let title = NSAttributedString(string: "pull to refresh", attributes: colorOption)
    
    refreshControl.attributedTitle = title
    refreshControl.backgroundColor = .themeBlue
    refreshControl.tintColor = .themeWhite
    refreshControl.addTarget(self, action: #selector(refresh), for: .valueChanged)
    if #available(iOS 10.0, *) {
      collectionView.refreshControl = refreshControl
    } else {
      collectionView.addSubview(refreshControl)
    }
  }
  
  @objc
  private func refresh() {
    self.presenter?.viewIsReady()
    
    DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {[weak self] in
      guard let `self` = self else {return}
      
      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) {
    alertWithOk(message: error.localizedDescription)
  }
  
  func goRedeemViewController(with model: RewardProduct?) {
    presenter?.goRedeemViewController(with: model)
  }
  
  func startLoading() {
    showProgressHud()
  }
  
  func endLoading() {
    hideProgressHud()
  }
}

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

// MARK: - XLPagerTabStrip's IndicatorInfoProvider
extension RewardViewController: IndicatorInfoProvider {
  func indicatorInfo(for pagerTabStripController: PagerTabStripViewController) -> IndicatorInfo {
    return IndicatorInfo.init(title: "products_text".localized())
  }
}