PDF_Office/PDF Office/PDF Master/KMClass/KMNPDFPageEdit/KMNThumbnailView/KMNThumbnailBaseViewController.swift

//
//  KMNThumbnailBaseViewController.swift
//  PDF Reader Pro
//
//  Created by 丁林圭 on 2024/10/21.
//

import Cocoa

@objc protocol KMNThumbnailBaseViewDelegate: AnyObject {
    @objc optional func clickThumbnailViewControlle(pageEditVC:KMNThumbnailBaseViewController?,currentIndex:Int)    
}

internal let kmnThumLocalForDraggedTypes = NSPasteboard.PasteboardType(rawValue: "kmnThumLocalForDraggedTypes")

class KMNThumbnailBaseViewController: NSViewController,NSCollectionViewDelegate, NSCollectionViewDataSource,NSCollectionViewDelegateFlowLayout {
    
    weak open var thumbnailBaseViewDelegate: KMNThumbnailBaseViewDelegate?
    
    @IBOutlet var backViewBox: NSBox!
    @IBOutlet var collectionView: NSCollectionView!
    
    let subTitleHeight: CGFloat = 20.0
    
    let maxCellHeight: CGFloat = 280.0
    
    private var currentDocument:CPDFDocument?
    
    public var showDocument: CPDFDocument? {
        return currentDocument
    }
    private var thumbnails:[KMNThumbnail] = []
    
    var selectionIndexPaths: Set<IndexPath> = [] {
        didSet {
            var indexpaths: Set<IndexPath> = []
            for indexpath in selectionIndexPaths {
                if (indexpath.section >= collectionView.numberOfSections) {
                    continue
                }
                if indexpath.section < 0 {
                    continue
                }
                if (indexpath.item >= collectionView.numberOfItems(inSection: indexpath.section)) {
                    continue
                }
                if indexpath.item < 0 {
                    continue
                }
                
                indexpaths.insert(indexpath)
            }
            
            collectionView.selectionIndexPaths = indexpaths
            collectionView.scrollToItems(at: indexpaths, scrollPosition: .top)
        }
    }
    
    public var clickPageIndex: Int{
        let minIndexPath = selectionIndexPaths.min(by: { $0.item < $1.item })
        return minIndexPath?.item ?? 0
    }
    
    public var isAdjustWidth:Bool = false
    
    public var isShowPageSize:Bool = false {
        didSet {
            if oldValue != isShowPageSize {
                var pageSize = pageThumbnailSize
                if(isShowPageSize) {
                    pageSize.height -= subTitleHeight
                } else {
                    pageSize.height += subTitleHeight
                }
                pageThumbnailSize = pageSize
            }
        }
    }
    
    public var pageThumbnailSize:CGSize = CGSizeMake(185.0, 260) {
        didSet {
            collectionView.reloadData()
        }
    }
    
    var dragLocalityIndexPaths: Set<IndexPath> = []
    
    deinit {
        thumbnailBaseViewDelegate = nil
        KMPrint("KMNThumbnailBaseViewController deinit.")
    }
    
    init(_ document: CPDFDocument?) {
        super.init(nibName: "KMNThumbnailBaseViewController", bundle: nil)
        currentDocument = document
    }
    
    init(_ filePath: String,password:String?) {
        super.init(nibName: "KMNThumbnailBaseViewController", bundle: nil)
        let document = CPDFDocument.init(url: URL(fileURLWithPath: filePath))
        if password != nil {
            document?.unlock(withPassword: password as String?)
        }
        
        if document?.allowsCopying == false || document?.allowsPrinting == false {
            self.exitCurrentView()
        } else {
            currentDocument = document
        }
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        thumbnails = []
        if currentDocument != nil {
            for i in 0 ... currentDocument!.pageCount {
                let thumbnail = KMNThumbnail.init(document: currentDocument!, currentPageIndex: Int(i))
                thumbnails.append(thumbnail)
            }
        }
        
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.isSelectable = true //支持拖拽需设置未True
        collectionView.allowsMultipleSelection = true
        
        collectionView.register(KMNThumbnailCollectionViewItem.self, forItemWithIdentifier: NSUserInterfaceItemIdentifier(rawValue: "thumbnailCollectionViewItem"))
        
        collectionView.registerForDraggedTypes(NSFilePromiseReceiver.readableDraggedTypes.map { NSPasteboard.PasteboardType($0) })
        
        collectionView.registerForDraggedTypes([kmnThumLocalForDraggedTypes, .fileURL,.string,.pdf])
    }
    
    public func exitCurrentView() {
        thumbnailBaseViewDelegate?.clickThumbnailViewControlle?(pageEditVC: self, currentIndex: clickPageIndex)
    }
    
    private func supportDragFileTypes()->[String] {
        let supportFiles = KMTools.pdfExtensions + KMConvertPDFManager.supportFileType()

        return supportFiles
    }
    
    // MARK: - NSCollectionViewDataSource
    func collectionView(_ collectionView: NSCollectionView, numberOfItemsInSection section: Int) -> Int {
        return thumbnails.count
    }
    
    func collectionView(_ collectionView: NSCollectionView, itemForRepresentedObjectAt indexPath: IndexPath) -> NSCollectionViewItem {
        let item: KMNThumbnailCollectionViewItem = collectionView.makeItem(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "thumbnailCollectionViewItem"), for: indexPath) as! KMNThumbnailCollectionViewItem
        item.isShowFileSize = isShowPageSize
        item.doubleClickBack = { [weak self] in
            self?.thumbnailBaseViewDelegate?.clickThumbnailViewControlle?(pageEditVC: self, currentIndex: indexPath.item)
        }

        item.thumbnailMode = thumbnails[indexPath.item]
        return item
    }
    
    
    // MARK: - NSCollectionViewDelegateFlowLayout
    
    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> NSSize {
        if isAdjustWidth == false {
            return pageThumbnailSize
        } else {
            let thumbnailMode: KMNThumbnail = thumbnails[indexPath.item]
            let pageSize = thumbnailMode.pageSize
            
            var cellHeight = pageSize.width / ((pageThumbnailSize.width - 32) * pageThumbnailSize.height)
            var cellWidth = pageThumbnailSize.width
            if cellHeight > maxCellHeight {
                cellHeight = 280.0
                cellWidth = cellHeight/pageSize.height * pageSize.width
            }
            
            return CGSize(width: cellWidth, height: cellHeight)
        }
    }
    
    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return 16.0
    }
    
    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
        return 24.0
    }
    
    public func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, insetForSectionAt section: Int) -> NSEdgeInsets {
        return NSEdgeInsetsMake(24.0, 24.0, 24.0, 24.0)
    }
    
    //MARK: - NSCollectionViewDelegate
    
    func collectionView(_ collectionView: NSCollectionView, canDragItemsAt indexPaths: Set<IndexPath>, with event: NSEvent) -> Bool {
        return IAPProductsManager.default().isAvailableAllFunction()
    }
    
    func collectionView(_ collectionView: NSCollectionView, writeItemsAt indexPaths: Set<IndexPath>, to pasteboard: NSPasteboard) -> Bool {
        let data: Data = try! NSKeyedArchiver.archivedData(withRootObject: indexPaths, requiringSecureCoding: true)
        pasteboard.declareTypes([kmnThumLocalForDraggedTypes], owner: self)
        pasteboard.setData(data, forType: kmnThumLocalForDraggedTypes)
        
        dragLocalityIndexPaths.removeAll()
        dragLocalityIndexPaths = indexPaths
        return true
    }
    
    func collectionView(_ collectionView: NSCollectionView, pasteboardWriterForItemAt indexPath: IndexPath) -> NSPasteboardWriting? {
        return String(indexPath.item) as NSPasteboardWriting
    }
    
    func collectionView(_ collectionView: NSCollectionView, draggingSession session: NSDraggingSession, willBeginAt screenPoint: NSPoint, forItemsAt indexPaths: Set<IndexPath>) {
        dragLocalityIndexPaths = indexPaths
    }
    
    func collectionView(_ collectionView: NSCollectionView, validateDrop draggingInfo: NSDraggingInfo, proposedIndexPath proposedDropIndexPath: AutoreleasingUnsafeMutablePointer<NSIndexPath>, dropOperation proposedDropOperation: UnsafeMutablePointer<NSCollectionView.DropOperation>) -> NSDragOperation {
        let pboard = draggingInfo.draggingPasteboard
        if (pboard.availableType(from: [kmnThumLocalForDraggedTypes]) != nil) {
            return .move
        } else if (pboard.availableType(from: [.localDraggedTypes]) != nil) {
        
            return .move
        } else if ((pboard.availableType(from: [.fileURL])) != nil) {
            guard let pbItems = pboard.pasteboardItems else {
                return NSDragOperation(rawValue: 0)
            }
            let allowedFileTypes = supportDragFileTypes()
            
            var hasValidFile = false
            for item in pbItems {
                guard let data = item.string(forType: .fileURL), let fileUrl = URL(string: data) else {
                    continue
                }
                let type = fileUrl.pathExtension.lowercased()
                if (allowedFileTypes.contains(type)) {
                    hasValidFile = true
                    break
                }
            }
            
            if (!hasValidFile) {
                return NSDragOperation(rawValue: 0)
            }
        }
        
        return .generic
    }
    
    func collectionView(_ collectionView: NSCollectionView, acceptDrop draggingInfo: NSDraggingInfo, indexPath: IndexPath, dropOperation: NSCollectionView.DropOperation) -> Bool {
        let result = false
        
        
        return true
    }
    
    func collectionView(_ collectionView: NSCollectionView, draggingSession session: NSDraggingSession, endedAt screenPoint: NSPoint, dragOperation operation: NSDragOperation) {
        dragLocalityIndexPaths = []
    }


}