djid_sirani_ios/Sirani/View/Faq/FaqList/FaqVC.swift

//
//  FaqVC.swift
//  Sirani
//
//  Created by Anhar Solehudin on 24/03/19.
//  Copyright © 2019 Anhar Solehudin. All rights reserved.
//

import UIKit
import WebKit

class FaqVC: UIViewController {
    
    @IBOutlet weak var cvFaqCategories: UICollectionView!
    @IBOutlet weak var lblCategoryName: UILabel!
    @IBOutlet weak var tvFaqContent: UITableView!
    @IBOutlet weak var progressLayout: UIView!
    @IBOutlet weak var progress: UIActivityIndicatorView!
    
    // 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: FaqPresenter!
    private var faqCategories: [FaqCategory] =  [FaqCategory]()
    private var faqContents: [FaqContent] =  [FaqContent]()
    private var selectedFaqContent: FaqContent? = nil
    
    // others
    private var loading = false
    
    // View Lifecycles
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // init collection view
        let flowLayout = UICollectionViewFlowLayout()
        flowLayout.sectionInset = .init(top: 0, left: 16, bottom: 0, right: 16)
        flowLayout.itemSize = CGSize(width: 120, height: 48)
        flowLayout.minimumInteritemSpacing = 0
        flowLayout.minimumLineSpacing = 8
        flowLayout.scrollDirection = .horizontal
        cvFaqCategories.backgroundColor = .white
        cvFaqCategories.collectionViewLayout = flowLayout
        cvFaqCategories.delegate = self
        cvFaqCategories.dataSource = self
        cvFaqCategories.register(FaqCategoryCell.self, forCellWithReuseIdentifier: "faqCategoryCellId")
        
        // init table view
        tvFaqContent.delegate = self
        tvFaqContent.dataSource = self
        
        // load data
        presenter = FaqPresenter(siraniApiServices: SiraniApiServices())
        presenter.attachView(view: self)
        loadDataCategories()
    }
    
    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? FaqDetailVC {
            detailsVC.faqContent = selectedFaqContent
        }
    }
    
    @IBAction func unwindToFaqList(segue: UIStoryboardSegue) {}
    
    // private functions
    private func loadDataCategories() {
        if ConnectionHelper.isConnectedToNetwork() {
            self.presenter.loadDataCategory()
        } else {
            showNoConnection()
        }
    }
    
    private func loadDataContents(categoryId: Int) {
        if ConnectionHelper.isConnectedToNetwork() {
            if !self.faqContents.isEmpty {
                self.faqContents.removeAll()
                tvFaqContent.reloadData()
            }
            self.presenter.loadDataContent(faq_cat_id: categoryId)
            
        } else {
            showNoConnection()
        }
    }
       
}

extension FaqVC: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        if collectionView == cvFaqCategories {
            return faqCategories.count
        } else {
            return 0
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        if collectionView == cvFaqCategories {
            if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "faqCategoryCellId", for: indexPath) as? FaqCategoryCell {
                cell.set(faqCategory: self.faqCategories[indexPath.row])
                return cell
            } else {
                return FaqCategoryCell()
            }
        } else {
            return FaqCategoryCell()
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        if collectionView == cvFaqCategories {
            for i in 0...faqCategories.count-1 {
                faqCategories[i].updateSelected(selectedValue: false)
            }
            faqCategories[indexPath.row].updateSelected(selectedValue: true)
            lblCategoryName.text = faqCategories[indexPath.row].faq_cat_name
            cvFaqCategories.reloadData()
            
            self.loadDataContents(categoryId: faqCategories[indexPath.row].faq_cat_id)
        }
    }
    
}

// UITableController Protocols
extension FaqVC: UITableViewDelegate, UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return faqContents.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if tableView == tvFaqContent {
            if let cell = tableView.dequeueReusableCell(withIdentifier: "faqContentCellId", for: indexPath) as? FaqContentCell {
                
                let data = faqContents[indexPath.row]
                cell.updateViews(faqContent: data)
                
                return cell
            } else {
                return FaqContentCell()
            }
        } else {
            return FaqContentCell()
        }
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if tableView == tvFaqContent {
            selectedFaqContent = faqContents[indexPath.row]
            performSegue(withIdentifier: "FaqDetailSegueId", sender: self)
        }
    }
}


// View Delegate Protocols
extension FaqVC: FaqViewDelegate {
    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 setFaqCategoryList(faqCategoryList: [FaqCategory]) {
        self.faqCategories.removeAll()
        if faqCategoryList.count > 0 {
            for faqCategory in faqCategoryList {
                self.faqCategories.append(faqCategory)
                cvFaqCategories.reloadData()
            }
            faqCategories[0].updateSelected(selectedValue: true)
            lblCategoryName.text = faqCategories[0].faq_cat_name
            self.loadDataContents(categoryId: faqCategories[0].faq_cat_id)
        }
    }
    
    func setFaqContentList(faqContentList: [FaqContent]) {
        if faqContentList.count > 0 {
            for faqContent in faqContentList {
                self.faqContents.append(faqContent)
                tvFaqContent.beginUpdates()
                tvFaqContent.insertRows(
                    at: [IndexPath(row: self.faqContents.count-1, section: 0)],
                    with: .none
                )
                tvFaqContent.endUpdates()
            }
        }
    }
}