djid_sirani_ios/Sirani/View/Aplikasi/AplikasiStatus/AplikasiStatusVC.swift

//
//  AplikasiStatusVC.swift
//  Sirani
//
//  Created by Anhar Solehudin on 21/04/19.
//  Copyright © 2019 Anhar Solehudin. All rights reserved.
//

import UIKit

class AplikasiStatusVC: UIViewController {
    
    // Outlets
    @IBOutlet weak var aplikasiStatusTV: UITableView!
    @IBOutlet weak var noDataLayout: UIView!
    @IBOutlet weak var progressLayout: UIView!
    @IBOutlet weak var progress: UIActivityIndicatorView!

    // View Id
    private let cellId = "aplikasiStatusCellId"
    
    // Segue Id
    private let unwindToHomeSegueId = "unwindAplikasiStatusToHomeSegueId"
    private let searchSegueId = "searchAplikasiStatusSegueId"
    
    // 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: AplikasiStatusPresenter!
    private var dataList: [AplikasiStatus] =  [AplikasiStatus]()
    
    // Request Params
    private var cursor: Int = 0
    private var prev: Int = 1
    private var jenis: String = ""
    private var columns: String = ""
    private var search: String = ""
    
    // Others
    private var loading = false
    private var lastDataLoadedEmpty = false
    private var loadMore = false
    
    // View Lifecycles
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        aplikasiStatusTV.delegate = self
        aplikasiStatusTV.dataSource = self
        aplikasiStatusTV.separatorStyle = .none
        aplikasiStatusTV.rowHeight = UITableView.automaticDimension
        aplikasiStatusTV.estimatedRowHeight = 220
        
        presenter = AplikasiStatusPresenter(siraniApiServices: SiraniApiServices())
        presenter.attachView(view: self)
        
        loadData()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        presenter.attachView(view: self)
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        presenter.detachView()
    }
    
    // private functions
    private func loadData() {
        if !loading && !lastDataLoadedEmpty {
            if ConnectionHelper.isConnectedToNetwork() {
                presenter.loadData(cursor: cursor, prev: prev, jenis: jenis, columns: columns, search: search)
            } else {
                showNoConnection()
            }
        }
    }
    
    // Actions
    @IBAction func onBtnBackTap(_ sender: Any) {
        performSegue(withIdentifier: unwindToHomeSegueId, sender: self)
    }

    @IBAction func onBtnSearchTap(_ sender: Any) {
        performSegue(withIdentifier: searchSegueId, sender: self)
    }
    
    @IBAction func unwindToAplikasiStatus(segue: UIStoryboardSegue) {}
    
}

// View Delegate Protocols
extension AplikasiStatusVC: AplikasiStatusViewDelegate {
    
    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
        progress.startAnimating()
        progressLayout.show()
    }
    
    func hideLoading() {
        loading = false
        progress.stopAnimating()
        progressLayout.hide()
    }
    
    func showNoDataLayout() {
        if cursor == 0 {
            noDataLayout.show()
        }
    }
    
    func hideNoDataLayout() {
        noDataLayout.hide()
    }
    
    func setDataList(dataList: [AplikasiStatus]) {
        
        if cursor == 0 {
            noDataLayout.hide()
        }
        
        if dataList.count > 0 {
            
            for data in dataList {
                self.dataList.append(data)
                aplikasiStatusTV.beginUpdates()
                aplikasiStatusTV.insertRows(
                    at: [IndexPath(row: self.dataList.count-1, section: 0)],
                    with: .none
                )
                aplikasiStatusTV.endUpdates()
            }
            
            let totalData = dataList.count
            cursor += totalData
            loadMore = true
        } else {
            lastDataLoadedEmpty = true
            loadMore = false
        }
    }
}

// UITableController Protocols
extension AplikasiStatusVC: UITableViewDelegate, UITableViewDataSource, UIScrollViewDelegate {
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dataList.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if tableView == aplikasiStatusTV {
            if let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as? AplikasiStatusCell {
                
                let data = dataList[indexPath.row]
                cell.updateViews(aplikasiStatus: data)
                
                return cell
            } else {
                return AplikasiStatusCell()
            }
        } else {
            return AplikasiStatusCell()
        }
    }
    
    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()
        }
    }
    
}

// Search Delegate Protocols
extension AplikasiStatusVC: SearchAplikasiStatusDelegate {
    func onSearch(search: String, parameter: String, jenis: String) {
        presenter.attachView(view: self)
        
        loadMore = false
        loading = false
        lastDataLoadedEmpty = false
        
        self.cursor = 0
        self.prev = 1
        self.search = search
        self.jenis = jenis
        self.columns = parameter

        dataList.removeAll()
        aplikasiStatusTV.reloadData()
        
        loadData()
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == searchSegueId {
            let destinationVC: SearchAplikasiStatusVC = segue.destination as! SearchAplikasiStatusVC
            destinationVC.delegate = self
        }
    }
}