//
//  NCMedia.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 12/02/2019.
//  Copyright © 2018 Marino Faggiana. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import Foundation
import Sheeeeeeeeet

class NCMedia: UIViewController ,UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UIGestureRecognizerDelegate, DropdownMenuDelegate, DZNEmptyDataSetSource, DZNEmptyDataSetDelegate  {
    
    @IBOutlet weak var collectionView: UICollectionView!
    
    @IBOutlet weak var menuButtonMore: UIButton!
    @IBOutlet weak var menuButtonSwitch: UIButton!
    @IBOutlet weak var menuView: UIView!
    
    private let appDelegate = UIApplication.shared.delegate as! AppDelegate
   
    private var metadataPush: tableMetadata?
    private var isEditMode = false
    private var selectFileID = [String]()
    
    private var filterTypeFileImage = false;
    private var filterTypeFileVideo = false;
    
    private var sectionDatasource = CCSectionDataSourceMetadata()
    
    private var autoUploadFileName = ""
    private var autoUploadDirectory = ""
    
    private var gridLayout: NCGridLayout!
    
    private var actionSheet: ActionSheet?
    
    private let headerMenuHeight: CGFloat = 50
    private let sectionHeaderHeight: CGFloat = 20
    private let footerHeight: CGFloat = 50
    
    private var addWidth: CGFloat = 10
    
    private var readRetry = 0
    private var isDistantPast = false

    private let refreshControl = UIRefreshControl()
    private var loadingSearch = false

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        appDelegate.activeMedia = self
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Cell
        collectionView.register(UINib.init(nibName: "NCGridMediaCell", bundle: nil), forCellWithReuseIdentifier: "gridCell")
        
        // Header
        collectionView.register(UINib.init(nibName: "NCSectionHeader", bundle: nil), forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "sectionHeader")
        
        // Footer
        collectionView.register(UINib.init(nibName: "NCSectionFooter", bundle: nil), forSupplementaryViewOfKind: UICollectionView.elementKindSectionFooter, withReuseIdentifier: "sectionFooter")
        
        collectionView.alwaysBounceVertical = true

        gridLayout = NCGridLayout()
        gridLayout.heightLabelPlusButton = 0
        gridLayout.preferenceWidth = 80
        gridLayout.sectionInset = UIEdgeInsets(top: 10, left: 1, bottom: 10, right: 1)
        gridLayout.sectionHeadersPinToVisibleBounds = true

        collectionView.collectionViewLayout = gridLayout

        // Add Refresh Control
        collectionView.refreshControl = refreshControl
        
        // Configure Refresh Control
        refreshControl.tintColor = NCBrandColor.sharedInstance.brandText
        refreshControl.backgroundColor = NCBrandColor.sharedInstance.brand
        refreshControl.addTarget(self, action: #selector(loadNetworkDatasource), for: .valueChanged)
        
        // empty Data Source
        collectionView.emptyDataSetDelegate = self;
        collectionView.emptyDataSetSource = self;
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        // Color
        appDelegate.aspectNavigationControllerBar(self.navigationController?.navigationBar, online: appDelegate.reachability.isReachable(), hidden: false)
        appDelegate.aspectTabBar(self.tabBarController?.tabBar, hidden: false)
        
        self.navigationItem.title = NSLocalizedString("_media_", comment: "")
        
        // get auto upload folder
        autoUploadFileName = NCManageDatabase.sharedInstance.getAccountAutoUploadFileName()
        autoUploadDirectory = NCManageDatabase.sharedInstance.getAccountAutoUploadDirectory(appDelegate.activeUrl)
        
        // clear variable
        isDistantPast = false
        readRetry = 0
        
        loadNetworkDatasource()
        collectionViewReloadDataSource()
    }
    
    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransition(to: size, with: coordinator)
        
        coordinator.animate(alongsideTransition: nil) { _ in
            self.collectionView.collectionViewLayout.invalidateLayout()
            self.actionSheet?.viewDidLayoutSubviews()
        }
    }
    
    // MARK: DZNEmpty
    
    func backgroundColor(forEmptyDataSet scrollView: UIScrollView) -> UIColor? {
        return NCBrandColor.sharedInstance.backgroundView
    }
    
    func image(forEmptyDataSet scrollView: UIScrollView) -> UIImage? {
        return CCGraphics.changeThemingColorImage(UIImage.init(named: "mediaNoRecord"), multiplier: 2, color: NCBrandColor.sharedInstance.brandElement)
    }
    
    func title(forEmptyDataSet scrollView: UIScrollView) -> NSAttributedString? {
        
        var text = "\n" + NSLocalizedString("_tutorial_photo_view_", comment: "")

        if loadingSearch {
            text = "\n" + NSLocalizedString("_search_in_progress_", comment: "")
        }
        
        let attributes = [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 20), NSAttributedString.Key.foregroundColor: UIColor.lightGray]
        return NSAttributedString.init(string: text, attributes: attributes)
    }
    
    func emptyDataSetShouldAllowScroll(_ scrollView: UIScrollView) -> Bool {
        return true
    }
    
    // MARK: IBAction
    
    @IBAction func touchUpInsideMenuButtonSwitch(_ sender: Any) {
        
        let itemSizeStart = self.gridLayout.itemSize
        
        UIView.animate(withDuration: 0.0, animations: {
            
            if self.gridLayout.numItems == 1 && self.addWidth > 0 {
                self.addWidth = -10
            } else if itemSizeStart.width < 50 {
                self.addWidth = 10
            }
            
            repeat {
                self.gridLayout.preferenceWidth = self.gridLayout.preferenceWidth + self.addWidth
            } while (self.gridLayout.itemSize == itemSizeStart)
            
            self.collectionView.collectionViewLayout.invalidateLayout()
        })
    }
    
    @IBAction func touchUpInsideMenuButtonMore(_ sender: Any) {
        
        var menuView: DropdownMenu?

        if !isEditMode {
            
            let item0 = DropdownItem(image: CCGraphics.changeThemingColorImage(UIImage.init(named: "select"), multiplier: 2, color: NCBrandColor.sharedInstance.icon), title:  NSLocalizedString("_select_", comment: ""))
            let item1 = DropdownItem(image: CCGraphics.changeThemingColorImage(UIImage.init(named: "folderMedia"), multiplier: 2, color: NCBrandColor.sharedInstance.icon), title:  NSLocalizedString("_select_media_folder_", comment: ""))
            var item2: DropdownItem
            if filterTypeFileImage {
                item2 = DropdownItem(image: CCGraphics.changeThemingColorImage(UIImage.init(named: "imageno"), multiplier: 2, color: NCBrandColor.sharedInstance.icon), title:  NSLocalizedString("_media_viewimage_show_", comment: ""))
            } else {
                item2 = DropdownItem(image: CCGraphics.changeThemingColorImage(UIImage.init(named: "imageyes"), multiplier: 2, color: NCBrandColor.sharedInstance.icon), title:  NSLocalizedString("_media_viewimage_hide_", comment: ""))
            }
            var item3: DropdownItem
            if filterTypeFileVideo {
                item3 = DropdownItem(image: CCGraphics.changeThemingColorImage(UIImage.init(named: "videono"), multiplier: 2, color: NCBrandColor.sharedInstance.icon), title:  NSLocalizedString("_media_viewvideo_show_", comment: ""))
            } else {
                item3 = DropdownItem(image: CCGraphics.changeThemingColorImage(UIImage.init(named: "videoyes"), multiplier: 2, color: NCBrandColor.sharedInstance.icon), title:  NSLocalizedString("_media_viewvideo_hide_", comment: ""))
            }
            menuView = DropdownMenu(navigationController: self.navigationController!, items: [item0,item1,item2,item3], selectedRow: -1)
            menuView?.token = "menuButtonMore"
            
        } else {
            
            let item0 = DropdownItem(image: CCGraphics.changeThemingColorImage(UIImage.init(named: "select"), multiplier: 2, color: NCBrandColor.sharedInstance.icon), title:  NSLocalizedString("_cancel_", comment: ""))
            
            let item1 = DropdownItem(image: CCGraphics.changeThemingColorImage(UIImage.init(named: "trash"), multiplier: 2, color: NCBrandColor.sharedInstance.icon), title:  NSLocalizedString("_delete_", comment: ""))
            
            menuView = DropdownMenu(navigationController: self.navigationController!, items: [item0, item1], selectedRow: -1)
            menuView?.token = "menuButtonMoreSelect"
        }
        
        menuView?.delegate = self
        menuView?.rowHeight = 45
        menuView?.highlightColor = NCBrandColor.sharedInstance.brand
        menuView?.tableView.alwaysBounceVertical = false
        menuView?.tableViewBackgroundColor = UIColor.white
        
        let header = (sender as? UIButton)?.superview
        let headerRect = self.collectionView.convert(header!.bounds, from: self.view)
        let menuOffsetY =  headerRect.height - headerRect.origin.y - 2
        menuView?.topOffsetY = CGFloat(menuOffsetY)
        
        menuView?.showMenu()
    }
    
    // MARK: DROP-DOWN-MENU

    func dropdownMenu(_ dropdownMenu: DropdownMenu, didSelectRowAt indexPath: IndexPath) {
        
        if dropdownMenu.token == "menuButtonMore" {
            switch indexPath.row {
            case 0:
                isEditMode = true
            case 1: break
            case 2:
                filterTypeFileImage = !filterTypeFileImage
                collectionViewReloadDataSource()
            case 3:
                filterTypeFileVideo = !filterTypeFileVideo
                collectionViewReloadDataSource()
            default: ()
            }
        }
        
        if dropdownMenu.token == "menuButtonMoreSelect" {
            switch indexPath.section {
            case 0:
                isEditMode = false
                selectFileID.removeAll()
                collectionView.reloadData()
            case 1: break
           
            default: ()
            }
        }
    }
    
    // MARK: NC API
    
    func deleteItem(with metadata: tableMetadata, sender: Any) {
        
        var items = [ActionSheetItem]()
        
        guard let tableDirectory = NCManageDatabase.sharedInstance.getTableDirectory(predicate: NSPredicate(format: "account == %@ AND serverUrl == serverUrl", appDelegate.activeAccount, metadata.serverUrl)) else {
            return
        }
        
        items.append(ActionSheetDangerButton(title: NSLocalizedString("_delete_", comment: "")))
        items.append(ActionSheetCancelButton(title: NSLocalizedString("_cancel_", comment: "")))
        
        actionSheet = ActionSheet(items: items) { sheet, item in
            if item is ActionSheetDangerButton {
                NCMainCommon.sharedInstance.deleteFile(metadatas: [metadata], e2ee: tableDirectory.e2eEncrypted, serverUrl: tableDirectory.serverUrl, folderFileID: tableDirectory.fileID) { (errorCode, message) in
                    self.collectionViewReloadDataSource()
                }
            }
            if item is ActionSheetCancelButton { print("Cancel buttons has the value `true`") }
        }
        
        let headerView = NCActionSheetHeader.sharedInstance.actionSheetHeader(isDirectory: metadata.directory, iconName: metadata.iconName, fileID: metadata.fileID, fileNameView: metadata.fileNameView, text: metadata.fileNameView)
        actionSheet?.headerView = headerView
        actionSheet?.headerView?.frame.size.height = 50
        
        actionSheet?.present(in: self, from: sender as! UIButton)
    }
    
    func search(lteDate: Date, gteDate: Date, addPast: Bool, setDistantPast: Bool) {
        
        if appDelegate.activeAccount.count == 0 {
            return
        }
        
        if addPast && isDistantPast {
            return
        }
        
        if !addPast && loadingSearch {
            return
        }
        
        if setDistantPast {
            isDistantPast = true
        }
        
        if addPast {
            CCGraphics.addImage(toTitle: NSLocalizedString("_media_", comment: ""), colorTitle: NCBrandColor.sharedInstance.brandText, imageTitle: CCGraphics.changeThemingColorImage(UIImage.init(named: "load"), multiplier: 2, color: NCBrandColor.sharedInstance.brandText), imageRight: false, navigationItem: self.navigationItem)
        }
        loadingSearch = true

        let startDirectory = NCManageDatabase.sharedInstance.getAccountStartDirectoryMediaTabView(CCUtility.getHomeServerUrlActiveUrl(appDelegate.activeUrl))
        
        OCNetworking.sharedManager()?.search(withAccount: appDelegate.activeAccount, fileName: "", serverUrl: startDirectory, contentType: ["image/%", "video/%"], lteDateLastModified: lteDate, gteDateLastModified: gteDate, depth: "infinity", completion: { (account, metadatas, message, errorCode) in
            
            self.loadingSearch = false

            self.refreshControl.endRefreshing()
            self.navigationItem.titleView = nil
            self.navigationItem.title = NSLocalizedString("_media_", comment: "")
            
            if errorCode == 0 && account == self.appDelegate.activeAccount {
                
                var differenceInsert: Int64 = 0
                
                if metadatas != nil && metadatas!.count > 0 {
                    differenceInsert = NCManageDatabase.sharedInstance.createTablePhotos(metadatas as! [tableMetadata], lteDate: lteDate, gteDate: gteDate, account: account!)
                }
                
                print("[LOG] Different Insert \(differenceInsert)]")

                if differenceInsert != 0 {
                    self.readRetry = 0
                    self.collectionViewReloadDataSource()
                }
                
                if differenceInsert == 0 && addPast {
                    
                    self.readRetry += 1
                    
                    switch self.readRetry {
                    case 1:
                        var gteDate = Calendar.current.date(byAdding: .day, value: -90, to: gteDate)!
                        gteDate = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: gteDate)!
                        self.search(lteDate: lteDate, gteDate: gteDate, addPast: addPast, setDistantPast: false)
                        print("[LOG] Media search 90 gg]")
                    case 2:
                        var gteDate = Calendar.current.date(byAdding: .day, value: -180, to: gteDate)!
                        gteDate = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: gteDate)!
                        self.search(lteDate: lteDate, gteDate: gteDate, addPast: addPast, setDistantPast: false)
                        print("[LOG] Media search 180 gg]")

                    case 3:
                        var gteDate = Calendar.current.date(byAdding: .day, value: -360, to: gteDate)!
                        gteDate = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: gteDate)!
                        self.search(lteDate: lteDate, gteDate: gteDate, addPast: addPast, setDistantPast: false)
                        print("[LOG] Media search 360 gg]")

                    default:
                        self.search(lteDate: lteDate, gteDate: NSDate.distantPast, addPast: addPast, setDistantPast: true)
                        print("[LOG] Media search distant pass]")
                    }
                }
                
                self.collectionView?.reloadData()
            }            
        })
    }
    
    @objc func loadNetworkDatasource() {
        
        if appDelegate.activeAccount.count == 0 {
            return
        }
        
        if self.sectionDatasource.allRecordsDataSource.count == 0 {
            
            let gteDate = Calendar.current.date(byAdding: .day, value: -30, to: Date())
            self.search(lteDate: Date(), gteDate: gteDate!, addPast: true, setDistantPast: false)
            
        } else {
            
            let gteDate = NCManageDatabase.sharedInstance.getTablePhotoDate(account: self.appDelegate.activeAccount, order: .orderedAscending)
            self.search(lteDate: Date(), gteDate: gteDate, addPast: false, setDistantPast: false)
        }
        
        self.collectionView?.reloadData()
    }
    
    // MARK: COLLECTIONVIEW METHODS
    
    func collectionViewReloadDataSource() {
        
        DispatchQueue.global().async {
    
            let metadatas = NCManageDatabase.sharedInstance.getTablePhotos(predicate: NSPredicate(format: "account == %@", self.appDelegate.activeAccount))
            self.sectionDatasource = CCSectionMetadata.creataDataSourseSectionMetadata(metadatas, listProgressMetadata: nil, groupByField: "date", filterFileID: nil, filterTypeFileImage: self.filterTypeFileImage, filterTypeFileVideo: self.filterTypeFileVideo, activeAccount: self.appDelegate.activeAccount)
            
            DispatchQueue.main.async {
                self.collectionView?.reloadData()
            }
        }
    }

    public func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        //caused by user
        selectSearchSections()
    }
    
    public func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        if (!decelerate) {
            //cause by user
            selectSearchSections()
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
        
        if kind == UICollectionView.elementKindSectionFooter {
            
            let sizeCollection = collectionView.bounds.size.height
            let sizeContent = collectionView.contentSize.height
            
            if sizeContent <= sizeCollection {
                selectSearchSections()
            }
        }
        
        if kind == UICollectionView.elementKindSectionHeader {
            
            let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "sectionHeader", for: indexPath) as! NCSectionHeader
            
            header.backgroundColor = .clear
            header.setTitleLabel(sectionDatasource: sectionDatasource, section: indexPath.section)
            
            return header
            
        } else {
            
            let footer = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "sectionFooter", for: indexPath) as! NCSectionFooter
            
            footer.setTitleLabel(sectionDatasource: sectionDatasource)

            return footer
        }
        
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
        if section == 0 {
            return CGSize(width: collectionView.frame.width, height: headerMenuHeight + sectionHeaderHeight)
        } else {
            return CGSize(width: collectionView.frame.width, height: sectionHeaderHeight)
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForFooterInSection section: Int) -> CGSize {
        let sections = sectionDatasource.sectionArrayRow.allKeys.count
        if (section == sections - 1) {
            return CGSize(width: collectionView.frame.width, height: footerHeight)
        } else {
            return CGSize(width: collectionView.frame.width, height: 0)
        }
    }
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        let sections = sectionDatasource.sectionArrayRow.allKeys.count
        return sections
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        
        var numberOfItemsInSection: Int = 0
        
        if section < sectionDatasource.sections.count {
            let key = sectionDatasource.sections.object(at: section)
            let datasource = sectionDatasource.sectionArrayRow.object(forKey: key) as! [tableMetadata]
            numberOfItemsInSection = datasource.count
        }
        
        return numberOfItemsInSection
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
                
        guard let metadata = NCMainCommon.sharedInstance.getMetadataFromSectionDataSourceIndexPath(indexPath, sectionDataSource: sectionDatasource) else {
            return collectionView.dequeueReusableCell(withReuseIdentifier: "gridCell", for: indexPath) as! NCGridMediaCell
        }
        
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gridCell", for: indexPath) as! NCGridMediaCell
      
        NCMainCommon.sharedInstance.collectionViewCellForItemAt(indexPath, collectionView: collectionView, cell: cell, metadata: metadata, metadataFolder: nil, serverUrl: metadata.serverUrl, isEditMode: isEditMode, selectFileID: selectFileID, autoUploadFileName: autoUploadFileName, autoUploadDirectory: autoUploadDirectory, hideButtonMore: true, source: self)
        
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        
        guard let metadata = NCMainCommon.sharedInstance.getMetadataFromSectionDataSourceIndexPath(indexPath, sectionDataSource: sectionDatasource) else {
            return
        }
        metadataPush = metadata
        
        if isEditMode {
            if let index = selectFileID.index(of: metadata.fileID) {
                selectFileID.remove(at: index)
            } else {
                selectFileID.append(metadata.fileID)
            }
            collectionView.reloadItems(at: [indexPath])
            return
        }
        
        performSegue(withIdentifier: "segueDetail", sender: self)
    }
    
    // MARK: Utility
    
    func selectSearchSections() {
        
        let sections = NSMutableSet()
        let lastDate = NCManageDatabase.sharedInstance.getTablePhotoDate(account: self.appDelegate.activeAccount, order: .orderedDescending)
        var gteDate: Date?
        
        for item in collectionView.indexPathsForVisibleItems {
            if let metadata = NCMainCommon.sharedInstance.getMetadataFromSectionDataSourceIndexPath(item, sectionDataSource: sectionDatasource) {
                if let date = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: metadata.date as Date) {
                    sections.add(date)
                }
            }
        }
        let sortedSections = sections.sorted { (date1, date2) -> Bool in
            (date1 as! Date).compare(date2 as! Date) == .orderedDescending
        }
        
        if sortedSections.count >= 1 {
            let lteDate = Calendar.current.date(byAdding: .day, value: 1, to: sortedSections.first as! Date)!
            if lastDate == sortedSections.last as! Date {
                gteDate = Calendar.current.date(byAdding: .day, value: -30, to: sortedSections.last as! Date)!
                search(lteDate: lteDate, gteDate: gteDate!, addPast: true, setDistantPast: false)
            } else {
                gteDate = Calendar.current.date(byAdding: .day, value: -1, to: sortedSections.last as! Date)!
                search(lteDate: lteDate, gteDate: gteDate!, addPast: false, setDistantPast: false)
            }
        }
    }

    // MARK: SEGUE
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        
        let photoDataSource: NSMutableArray = []
        
        for fileID: String in sectionDatasource.allFileID as! [String] {
            let metadata = sectionDatasource.allRecordsDataSource.object(forKey: fileID) as! tableMetadata
            if metadata.typeFile == k_metadataTypeFile_image {
                photoDataSource.add(metadata)
            }
        }
        
        if let segueNavigationController = segue.destination as? UINavigationController {
            if let segueViewController = segueNavigationController.topViewController as? CCDetail {
            
                segueViewController.metadataDetail = metadataPush
                segueViewController.dateFilterQuery = nil
                segueViewController.photoDataSource = photoDataSource
                segueViewController.title = metadataPush!.fileNameView
            }
        }
    }
}