djid_sirani_ios/Sirani/View/Notification/NotificationList/NotificationListVC.swift

//
//  NotificationListVC.swift
//  Sirani
//
//  Created by Anhar Solehudin on 10/11/20.
//  Copyright © 2020 Anhar Solehudin. All rights reserved.
//

import UIKit
import SkeletonView

class NotificationListVC: UIViewController {
    
    
    @IBOutlet weak var notifListTV: UITableView!
    @IBOutlet weak var noDataLayout: UIView!
    @IBOutlet weak var progressLayout: UIView!
    @IBOutlet weak var progress: UIActivityIndicatorView!
    
    // View Id
    private let cellId = "notificationCellId"
    
    // String Message
    private let alertNoConnectionTitle = "Informasi"
    private let alertNoConnectionMsg = "Sepertinya Anda sedang tidak tersambung pada koneksi internet"
    private let alertNoConnectionActionYes = "OK"
    
    // Initialize
    private var presenter: NotificationListPresenter!
    private var dataList: [NotificationItem] =  [NotificationItem]()
    
    // Request Params
    private var cursor: Int = 0
    private var prev: Int = 1
    
    // Others
    private var loading = false
    private var lastDataLoadedEmpty = false
    private var loadMore = false
    private var selectedNotifId: Int = 0
    
    
    // View Lifecycles
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        notifListTV.delegate = self
        notifListTV.dataSource = self
        notifListTV.isSkeletonable = true
        
        presenter = NotificationListPresenter(siraniApiServices: SiraniApiServices())
        presenter.attachView(view: self)
        loadData()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        AppUtility.lockOrientation(.portrait)
        presenter.attachView(view: self)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        AppUtility.lockOrientation(.all)
        presenter.detachView()
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let detailsVC = segue.destination as? NotificationDetailVC {
            detailsVC.notifId = selectedNotifId
        }
    }
    
    @IBAction func unwindToNotificationList(segue: UIStoryboardSegue) {}
    
    @IBAction func onBackTapped(_ sender: Any) {
        performSegue(withIdentifier: "unwindNotificationListToHome", sender: self)
    }
    
    
    // private functions
    private func loadData() {
        if !loading && !lastDataLoadedEmpty {
            if ConnectionHelper.isConnectedToNetwork() {
                self.presenter.loadData(cursor: self.cursor, prev: self.prev)
                
            } else {
                showNoConnection()
            }
        }
    }
    
}

// View Delegate Protocols
extension NotificationListVC: NotificationListViewDelegate {
    
    func showNoConnection() {
        let alertNoConnection = UIAlertController(
            title: alertNoConnectionTitle,
            message: alertNoConnectionMsg,
            preferredStyle: .alert
        )
        alertNoConnection.addAction(
            UIAlertAction(title: alertNoConnectionActionYes, style: .default, handler: nil)
        )
        self.present(alertNoConnection, animated: true, completion: nil)
    }
    
    func showLoading() {
        loading = true
        if dataList.isEmpty {
            DispatchQueue.main.async {
                self.view.layoutIfNeeded()
                self.notifListTV.showAnimatedGradientSkeleton()
            }
        } else {
            progress.startAnimating()
            progressLayout.show()
        }
    }
    
    func hideLoading() {
        loading = false
        notifListTV.hideSkeleton()
        progress.stopAnimating()
        progressLayout.hide()
    }
    
    func showNoDataLayout() {
        if cursor == 0 {
            noDataLayout.show()
        }
    }
    
    func hideNoDataLayout() {
        noDataLayout.hide()
    }
    
    func setDataList(dataList: [NotificationItem]) {
        
        if cursor == 0 {
            noDataLayout.hide()
        }
        
        if dataList.count > 0 {
            self.dataList.append(contentsOf: dataList)
            notifListTV.reloadData()
            
            let totalData = dataList.count
            cursor += totalData
            loadMore = true
        } else {
            lastDataLoadedEmpty = true
            loadMore = false
        }
    }
}

// UITableController Protocols
extension NotificationListVC: UITableViewDelegate, UITableViewDataSource, UIScrollViewDelegate, NotificationCellDelegate {
    func openNotifDetail(notificationItem: NotificationItem?, position: Int?) {
        if notificationItem != nil {
            selectedNotifId = notificationItem!.log_activity_id
            
            if position != nil {
                self.dataList[position!].updateIsRead(isRead: 1)
                notifListTV.beginUpdates()
                notifListTV.reloadRows(
                    at: [IndexPath(row: position!, section: 0)],
                    with: .none
                )
                notifListTV.endUpdates()
            }
            
            performSegue(withIdentifier: "NotificationDetailSegueId", sender: self)
        }
    }
    
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dataList.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if tableView == notifListTV {
            if let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as? NotificationCell {
                
                let data = dataList[indexPath.row]
                cell.cellDelegate = self
                cell.card.tag = indexPath.row
                cell.updateViews(notificationItem: data, position: indexPath.row)
                
                return cell
            } else {
                return NotificationCell()
            }
        } else {
            return NotificationCell()
        }
    }
    
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        let threshold = -5
        let contentOffset = scrollView.contentOffset.y
        let maximumOffset = scrollView.contentSize.height - scrollView.frame.size.height;
        
        if loadMore && !loading && (Int(maximumOffset - contentOffset) <= threshold) {
            loadData()
        }
    }
}

extension NotificationListVC: SkeletonTableViewDataSource {
    func collectionSkeletonView(_ skeletonView: UITableView, cellIdentifierForRowAt indexPath: IndexPath) -> ReusableCellIdentifier {
        return cellId
    }
}