djid_sirani_ios/Sirani/View/DaftarSertifikat/Index/DaftarSertifikatVC.swift

//
//  DaftarSertifikatVC.swift
//  Sirani
//
//  Created by Anhar Solehudin on 30/03/19.
//  Copyright © 2019 Anhar Solehudin. All rights reserved.
//

import UIKit
import SkeletonView

class DaftarSertifikatVC: UIViewController {
    
    // Outlets & Views
    @IBOutlet weak var certificatesTV: UITableView!
    @IBOutlet weak var progressLoading: UIView!
    @IBOutlet weak var layoutNoData: UIView!
    @IBOutlet weak var labelSubtitle: UILabel!
    
    // View Id
    private let daftarSertifikatCellId = "DaftarSertifikatCell"
    
    // Segue Id
    private let unwindToHomeSegueId = "unwindToHome"
    private let daftarSertifikatSearchSegueId = "daftarSertifikatSearchSegueId"
    
    // 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: DaftarSertifikatPresenter!
    private var certificates: [CertificateData] =  [CertificateData]()

    // Request Params
    private var jenis: String = "1"
    private var columns: String = ""
    private var cursor: Int = 0
    private var prev: Int = 1
    private var search: String = ""
    
    // Others
    private var loading = false
    private var lastDataLoadedEmpty = false
    private var loadMore = false
    private var kode: Int?
    
    // View Lifecycles
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        certificatesTV.delegate = self
        certificatesTV.dataSource = self
        certificatesTV.isSkeletonable = true
        certificatesTV.rowHeight = UITableView.automaticDimension
        certificatesTV.estimatedRowHeight = 120
        certificatesTV.separatorStyle = .none
        certificatesTV.backgroundColor = .groupTableViewBackground
        
        presenter = DaftarSertifikatPresenter(siraniApiServices: SiraniApiServices())
        presenter.attachView(view: self)
        loadCertificateData()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        presenter.attachView(view: self)
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        presenter.detachView()
    }
    
    // private functions
    private func loadCertificateData() {
        if !loading && !lastDataLoadedEmpty {
            if ConnectionHelper.isConnectedToNetwork() {
                self.presenter.loadCertificatesData(jenis: self.jenis, columns: self.columns, cursor: self.cursor, prev: self.prev, search: self.search)
            } else {
                showNoConnection()
            }
        }
    }
    
    // Actions
    @IBAction func onBackTapped(_ sender: Any) {
        performSegue(withIdentifier: unwindToHomeSegueId, sender: self)
    }
    
    @IBAction func onSearchTapped(_ sender: Any) {
        performSegue(withIdentifier: daftarSertifikatSearchSegueId, sender: self)
    }
    
    @IBAction func unwindToDaftarSertifikat(segue: UIStoryboardSegue) {}

}

// View Delegate Protocols
extension DaftarSertifikatVC: DaftarSertifikatViewDelegate {
    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 certificates.isEmpty {
            DispatchQueue.main.async {
                self.view.layoutIfNeeded()
                self.certificatesTV.showAnimatedGradientSkeleton()
            }
        } else {
            progressLoading.show()
        }
    }
    
    func hideLoading() {
        loading = false
        certificatesTV.hideSkeleton()
        progressLoading.hide()
    }
    
    func showNoDataLayout() {
        if cursor == 0 {
            layoutNoData.show()
        }
    }
    
    func hideNoDataLayout() {
        layoutNoData.hide()
    }
    
    func setCertificates(certificates: [CertificateData]) {
        if cursor == 0 {
            layoutNoData.hide()
        }
        
        if certificates.count > 0 {
            self.certificates.append(contentsOf: certificates)
            certificatesTV.reloadData()
            
            let totalData = certificates.count
            cursor += totalData
            loadMore = true
        } else {
            lastDataLoadedEmpty = true
            loadMore = false
        }
    }
}

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

// UITableController Protocols
extension DaftarSertifikatVC: UITableViewDelegate, UITableViewDataSource, UIScrollViewDelegate, SertifikatCellDelegate {

    func openSertifikatDetail(data: CertificateData?) {
        self.kode = data?.apl_id
        performSegue(withIdentifier: "sertifikatDetailSegueId", sender: self)
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return certificates.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if tableView == certificatesTV {
            if let cell = tableView.dequeueReusableCell(withIdentifier: daftarSertifikatCellId, for: indexPath) as? DaftarSertifikatCell {
                
                cell.cellDelegate = self
                cell.card.tag = indexPath.row
                let certificate = certificates[indexPath.row]
                cell.updateViews(certificateData: certificate)
                
                return cell
            } else {
                return DaftarSertifikatCell()
            }
        } else {
            return DaftarSertifikatCell()
        }
    }
    
    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) {
            loadCertificateData()
        }
    }
    
}

// SearchDaftarSertifikatModal Delegate Protocols
extension DaftarSertifikatVC: SearchDaftarSertifikatDelegate {
    func onSearch(search: String, parameter: String, jenis: String, jenisLabel: String) {
        presenter.attachView(view: self)
        
        loadMore = false
        loading = false
        lastDataLoadedEmpty = false
        
        
        self.cursor = 0
        self.prev = 0
        self.search = search
        self.jenis = jenis
        self.columns = parameter
        
        certificates.removeAll()
        certificatesTV.reloadData()
        labelSubtitle.text = jenisLabel
        
        loadCertificateData()
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == daftarSertifikatSearchSegueId {
            let destinationVC: SearchDaftarSertifikatVC = segue.destination as! SearchDaftarSertifikatVC
            destinationVC.delegate = self
        }
        
        if let detailSertifikatVC = segue.destination as? QRScannerVC {
            detailSertifikatVC.kode = kode
        }
    }
    
}