LONDON-IOS/GME Remit/Modules/RemittanceModules/OverseasModules/SelectCoupon/User Interface/View/SelectCouponViewController.swift

//
//  SelectCouponViewController.swift
//  GME Remit
//
//  Created by InKwon Devik Kim on 30/05/2019.
//Copyright © 2019 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit
import PanModal

protocol SelectCouponViewDelegate: class {
  func viewController(
    _ viewController: SelectCouponViewController,
    didSelect coupon: Coupon?
  )
}

class SelectCouponViewController: UIViewController {
  
  // MARK: Properties
  
  var presenter: SelectCouponModuleInterface?
  weak var delegate: SelectCouponViewDelegate?
  
  // MARK: Computed Properties
  
  var coupons: [Coupon]? {
    didSet {
      if (coupons?.count ?? 0) == 0 {
        noCouponMessageLabel.alpha = 1
      } else {
        noCouponMessageLabel.alpha = 0
      }
      
      tableView.reloadData()
    }
  }
  
  var selectedCoupon: Coupon? {
    didSet {
      let isUseCoupon = selectedCoupon != nil ? true : false
      couponButton.isEnabled = isUseCoupon
      couponButton.backgroundColor = isUseCoupon ? .themeRed : .lightGray
    }
  }
  
  // MARK: IBOutlets
  
  @IBOutlet weak var registCouponBackgroundView: UIView!
  @IBOutlet weak var registCouponTextField: UITextField!
  @IBOutlet weak var registCouponButton: UIButton!
  
  @IBOutlet weak var tableView: UITableView!
  @IBOutlet weak var couponButton: UIButton!
  @IBOutlet weak var noCouponMessageLabel: UILabel!
  
  // MARK: VC's Life cycle
  
  override func viewDidLoad() {
    super.viewDidLoad()
    setup()
    tableView.dataSource = self
    tableView.delegate = self
    couponButton.layer.cornerRadius = 5
    
    presenter?.fetchCoupons()
  }
  
  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    title = "Coupons"
    
  }
  // MARK: IBActions
  
  @IBAction func touchUseCouponButton(_ sender: UIButton) {
    delegate?.viewController(self, didSelect: selectedCoupon)
  }
  
}

// MARK: SelectCouponViewInterface
extension SelectCouponViewController: SelectCouponViewInterface {
  func setCoupons(didSelect coupon: Coupon?, with model: [Coupon]?) {
    selectedCoupon = coupon
    coupons = model
  }
  
  func error(with error: Error) {
    alert(type: .error, message: error.localizedDescription)
  }
  
  func startLoading() {
    showProgressHud()
  }
  
  func endLoading() {
    hideProgressHud()
  }
}

// MARK: Other Functions
extension SelectCouponViewController {
  private func setup() {
    // all setup should be done here
  }
}

// MARK: - UITableViewDataSource
extension SelectCouponViewController: UITableViewDataSource {
  func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return coupons?.count ?? 0
  }
  
  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "CouponCell") as? CouponCell else {
      return UITableViewCell()
    }
    cell.setModel(coupons?[indexPath.row])

    return cell
  }
  
}

extension SelectCouponViewController: UITableViewDelegate {
  func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    guard let cell = tableView.cellForRow(at: indexPath) as? CouponCell else {
      return
    }
    if cell.isSelectedCoupon {
      cell.isSelectedCoupon = false
      selectedCoupon = nil
    } else {
      cell.isSelectedCoupon = true
      selectedCoupon = coupons?[indexPath.row]
    }
  }
  
  func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    guard let cell = tableView.cellForRow(at: indexPath) as? CouponCell else {
      return
    }
    cell.isSelectedCoupon = false
    selectedCoupon = nil
  }
  
  func tableView(_ tableView: UITableView, didHighlightRowAt indexPath: IndexPath) {
    print("Highlight idx: \(indexPath.row)")
  }
  
}

// MARK: - PanModalPresenter
extension SelectCouponViewController: PanModalPresentable {
  var panScrollable: UIScrollView? {
    return self.tableView
  }
  
  var longFormHeight: PanModalHeight {
    return .maxHeight
  }

}