space-ios/iOSClient/Trash/NCTrash.swift

//
//  NCTrash.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 02/10/2018.
//  Copyright © 2018 Marino Faggiana. All rights reserved.
//

import Foundation
 

class NCTrash: UIViewController , UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UIGestureRecognizerDelegate, NCTrashListDelegate, NCTrashGridDelegate, NCTrashHeaderDelegate {
    
    @IBOutlet fileprivate weak var collectionView: UICollectionView!

    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    var path = ""
    var titleCurrentFolder = NSLocalizedString("_trash_view_", comment: "")
    var datasource = [tableTrash]()

    var listLayout: ListLayout!
    var gridLayout: GridLayout!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        collectionView.register(UINib.init(nibName: "NCTrashListCell", bundle: nil), forCellWithReuseIdentifier: "cell-list")
        collectionView.register(UINib.init(nibName: "NCTrashGridCell", bundle: nil), forCellWithReuseIdentifier: "cell-grid")
        
        listLayout = ListLayout(itemHeight: 60)
        gridLayout = GridLayout(numberOfColumns: 5)
        
        collectionView.collectionViewLayout = gridLayout
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        self.navigationItem.title = titleCurrentFolder

        if path == "" {
            let userID = (appDelegate.activeUserID as NSString).addingPercentEncoding(withAllowedCharacters: NSCharacterSet.urlFragmentAllowed)
            path = k_dav + "/trashbin/" + userID! + "/trash/"
        }
        
        let ocNetworking = OCnetworking.init(delegate: self, metadataNet: nil, withUser: appDelegate.activeUser, withUserID: appDelegate.activeUserID, withPassword: appDelegate.activePassword, withUrl: appDelegate.activeUrl)
        
        ocNetworking?.listingTrash(appDelegate.activeUrl, path:path, account: appDelegate.activeAccount, success: { (item) in
            
            NCManageDatabase.sharedInstance.deleteTrash(filePath: self.path)
            self.datasource = NCManageDatabase.sharedInstance.addTrashs(item as! [tableTrash])!
            
            self.collectionView.reloadData()
            
        }, failure: { (message, errorCode) in
            
            print("error " + message!)
        })
    }
    
    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransition(to: size, with: coordinator)
        
        coordinator.animate(alongsideTransition: nil) { _ in
            self.collectionView.collectionViewLayout.invalidateLayout()
        }
    }
    
    // MARK: tap
    
    func tapRestoreItem(with fileID: String) {
        print("tap item restore")
    }
    
    func tapMoreItem(with fileID: String) {
        print("tap item more")
    }
    
    func tapSwitchHeader() {
        
        if collectionView.collectionViewLayout == gridLayout {
            // list layout
            UIView.animate(withDuration: 0.0, animations: {
                self.collectionView.collectionViewLayout.invalidateLayout()
                self.collectionView.setCollectionViewLayout(self.listLayout, animated: false, completion: { (_) in
                    self.collectionView.reloadData()
                }) 
            })
        } else {
            // grid layout
            UIView.animate(withDuration: 0.0, animations: {
                self.collectionView.collectionViewLayout.invalidateLayout()
                self.collectionView.setCollectionViewLayout(self.gridLayout, animated: false, completion: { (_) in
                    self.collectionView.reloadData()
                })
            })
        }
    }
    
    func tapMoreHeader() {
        print("tap header more")
    }

    // MARK: collectionView methods
    
    func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
        
        let trashHeader = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "header", for: indexPath) as! NCTrashHeader
        trashHeader.delegate = self
        
        return trashHeader
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
        return CGSize(width: collectionView.frame.width, height: 30)
    }
    
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return datasource.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        
        let tableTrash = datasource[indexPath.item]
        var image: UIImage?
        
        if tableTrash.iconName.count > 0 {
            image = UIImage.init(named: tableTrash.iconName)
        } else {
            image = UIImage.init(named: "file")
        }
        
        if collectionView.collectionViewLayout == listLayout {
            
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell-list", for: indexPath) as! NCTrashListCell
            cell.delegate = self
            
            cell.fileID = tableTrash.fileID
            cell.labelTitle.text = tableTrash.trashbinFileName
            
            if tableTrash.directory {
                cell.imageItem.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "folder"), multiplier: 3, color: NCBrandColor.sharedInstance.brandElement)
                cell.labelInfo.text = CCUtility.dateDiff(tableTrash.date as Date)
            } else {
                cell.imageItem.image = image
                cell.labelInfo.text = CCUtility.dateDiff(tableTrash.date as Date) + " " + CCUtility.transformedSize(tableTrash.size)
            }
            
            return cell
        
        } else {
            
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell-grid", for: indexPath) as! NCTrashGridCell
            cell.delegate = self
            
            cell.fileID = tableTrash.fileID
            cell.labelTitle.text = tableTrash.trashbinFileName
            
            if tableTrash.directory {
                cell.imageItem.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "folder"), multiplier: 3, color: NCBrandColor.sharedInstance.brandElement)
            } else {
                cell.imageItem.image = image
            }
            
            return cell
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        
        let tableTrash = datasource[indexPath.item]
        
        if tableTrash.directory {
        
            let ncTrash:NCTrash = UIStoryboard(name: "NCTrash", bundle: nil).instantiateInitialViewController() as! NCTrash
            ncTrash.path = tableTrash.filePath + tableTrash.fileName
            ncTrash.titleCurrentFolder = tableTrash.trashbinFileName
            self.navigationController?.pushViewController(ncTrash, animated: true)
        }
    }
}

class ListLayout: UICollectionViewFlowLayout {
    
    var itemHeight: CGFloat = 60
    
    init(itemHeight: CGFloat) {
        super.init()
        
        self.itemHeight = itemHeight
        self.scrollDirection = .vertical
        self.sectionInset = UIEdgeInsets(top: 10, left: 0, bottom: 10, right: 0)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override var itemSize: CGSize {
        get {
            if let collectionView = collectionView {
                let itemWidth: CGFloat = collectionView.frame.width
                return CGSize(width: itemWidth, height: self.itemHeight)
            }
            
            // Default fallback
            return CGSize(width: 100, height: 100)
        }
        set {
            super.itemSize = newValue
        }
    }
    
    override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint) -> CGPoint {
        return proposedContentOffset
    }
}

class GridLayout: UICollectionViewFlowLayout {
    
    var numberOfColumns: Int = 5
    
    init(numberOfColumns: Int) {
        super.init()
        
        minimumInteritemSpacing = 10
        
        self.numberOfColumns = numberOfColumns
        self.scrollDirection = .vertical
        self.sectionInset = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override var itemSize: CGSize {
        get {
            if let collectionView = collectionView {
                let itemWidth: CGFloat = (collectionView.frame.width/CGFloat(self.numberOfColumns)) - self.minimumInteritemSpacing
                let itemHeight: CGFloat = itemWidth + 40
                return CGSize(width: itemWidth, height: itemHeight)
            }
            
            // Default fallback
            return CGSize(width: 100, height: 100)
        }
        set {
            super.itemSize = newValue
        }
    }
    
    override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint) -> CGPoint {
        return proposedContentOffset
    }
}