//
//  KMThumbnailViewController.swift
//  PDF Reader Pro
//
//  Created by lxy on 2022/10/10.
//

@objc protocol KMThumbnailViewControllerDelegate {
    @objc optional func gotoPageEdit(thumbnailViewController:KMThumbnailViewController, pages: [Int])
    @objc optional func pageDidSelect(controller: KMThumbnailViewController, pages: [Int])
    
    @objc optional func controller(controller: KMThumbnailViewController, itemClick item: Any?, itemKey: KMItemKey, params: Any?)
}

class KMThumbnailViewController: KMBaseViewController {
    open weak var delegate: KMThumbnailViewControllerDelegate?
    
    @IBOutlet weak var headerView: NSView!
    @IBOutlet weak var titleLabel: NSTextField!
    @IBOutlet weak var thumbnailView: KMPDFThumbnailView!
    @IBOutlet var doublePageBtn: NSButton!
    @IBOutlet weak var lineView: NSView!
    
    var doublePageMode : Bool! = false
    
    var isLocalEvent: Bool = false //是否为本视图事件
    var listView : CPDFListView!
    
    //注释状态
    var annotationShowState: KMAnnotationViewShowType = .none {
        didSet {
            if self.thumbnailView != nil {
                self.thumbnailView.annotationShowState = self.annotationShowState
            }
        }
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
    
    override func viewWillAppear() {
        super.viewWillAppear()
        self.thumbnailView.reloadData()
        
        self.thumbnailView.collectionView.selectionIndexes = IndexSet(integer: IndexSet.Element(self.listView.currentPageIndex))
        self.thumbnailView.collectionView.mouseDownCancelSelected = false
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.wantsLayer = true
        self.view.layer?.backgroundColor = NSColor.clear.cgColor
        
        self.lineView.backgroundColor(NSColor.km_init(hex: "#EDEEF0"))
        
        self.headerView.wantsLayer = true
        self.headerView.layer?.backgroundColor = NSColor.km_init(hex: "#F7F8FA").cgColor
        
        self.titleLabel.stringValue = NSLocalizedString("Thumbnails", comment: "")
        self.titleLabel.font = NSFont.SFProTextSemiboldFont(14.0)
        self.titleLabel.textColor = NSColor.km_init(hex: "#252629")
        
        if self.listView.document != nil {
            self.thumbnailView.document = self.listView.document
        }
//        self.doublePageBtn.isHidden = true
        
        self.thumbnailView.delegate = self
        self.thumbnailView.collectionView.isSelectable = true
        self.thumbnailView.collectionView.allowsMultipleSelection = true
        self.thumbnailView.isShowPageSize = true
        self.thumbnailView.isNeedMarkerLine = true
//        self.thumbnailView.collectionView.allowsEmptySelection = false
        var allowedFileTypes: [String] = []
//        if let _types = KMConvertPDFManagerOC.supportFileType() as? [String] {
        allowedFileTypes = KMTools.pdfExtensions + KMConvertPDFManager.supportFileType()
//        } else {
//            allowedFileTypes = KMTools.pdfExtensions + KMTools.imageExtensions
//        }
        self.thumbnailView.kmAllowedFileTypes = allowedFileTypes
        self.doublePageBtn.toolTip = NSLocalizedString("Single/Double column display", comment: "")
        
        self.pdfCurrentPageChange()
        
        self.initNotification()
    }
    
    func initNotification() {
        NotificationCenter.default.addObserver(self, selector: #selector(PDFViewEditingAreaDidChangedNotification), name: NSNotification.Name.init(rawValue: "kPDFViewEditingAreaDidChanged"), object: nil)
        
        NotificationCenter.default.addObserver(self, selector: #selector(KMPDFViewPageCountChangedNotification), name: NSNotification.Name.init(rawValue: "KMPDFViewRotatePage"), object: nil)
        
        NotificationCenter.default.addObserver(self, selector: #selector(KMPDFViewCurrentPageDidChangedNotification), name: NSNotification.Name.init(rawValue: "KMPDFViewCurrentPageDidChanged"), object: nil)
        
        NotificationCenter.default.addObserver(self, selector: #selector(KMPDFViewPageCountChangedNotification), name: NSNotification.Name.init(rawValue: "CPDFDocumentPageCountChangedNotification"), object: nil)
        
        NotificationCenter.default.addObserver(self, selector: #selector(AnnotationDidChangeNoti), name: NSNotification.Name.init(rawValue: "CPDFPageDidAddAnnotationNotification"), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(AnnotationDidChangeNoti), name: NSNotification.Name.init(rawValue: "CPDFPageDidRemoveAnnotationNotification"), object: nil)
    }
    
    func removeNotification() {
        NotificationCenter.default.removeObserver(self)
    }
    
    //MARK: Public Method
    func reloadData () {
        if self.doublePageMode {
            self.thumbnailView.thumbnailSzie = CGSize(width: 86, height: 101)
            self.doublePageBtn.image = NSImage(named: "KMImageNameThumbnailPage")
//            self.thumbnailView.isNeedMarkerLine = false
            self.thumbnailView.hasDragLineView = false
        } else {
            self.thumbnailView.thumbnailSzie = CGSize(width: 156, height: 180)
            self.doublePageBtn.image = NSImage(named: "KMImageNameThumbnailDoublePage")
//            self.thumbnailView.isNeedMarkerLine = false
        }
        self.thumbnailView.reloadData()
        
//        self.km_resignFirstResponder()
    }
    
    func reloadDataAtIndexs (indexs: IndexSet) {
        var selectPages: [Int] = []
        for index in indexs {
            selectPages.append(index+1)
        }
        DispatchQueue.main.async {
            var data = Set<IndexPath>()
            for index in selectPages {
                data.insert(IndexPath(item: index-1, section: 0))
            }
            self.thumbnailView.collectionView.reloadItems(at: data)
            
//            self.km_resignFirstResponder()
        }
    }
    
    //MARK: Private Method
    @IBAction func doublePageAction(_ sender: Any) {
        self.doublePageMode = !self.doublePageMode
        self.reloadData()
    }
    
    private func dragPagesForDescSort(_ indexs: IndexSet, _ toIndex: Int) {
        if (indexs.count <= 0) {
            return
        }

        /// 数据降序排序
        let indexArray = indexs.sorted { index1, index2 in
            return index1 > index2
        }
        
        var newIndexs: IndexSet = []
        for index in indexArray {
            newIndexs.insert(index)
        }
        
        self.dragPages(newIndexs, toIndex)
    }
    
    @objc private func dragPages(_ indexs: IndexSet, _ toIndex: Int) {
        if (indexs.count <= 0) {
            return
        }
        
        //获取原有page的下标 和 开始添加的下标
        var indexTemp: Int = toIndex
        var pageItems: [KMThumbnailPageItem] = []
        for index in indexs {
            let newPage: CPDFPage = self.listView?.document.page(at: UInt(index)).copy() as! CPDFPage
            let pageItem = KMThumbnailPageItem(page: newPage, index: index, oldIndex: index)
            pageItems.append(pageItem)
            if (toIndex > index) { /// 删除了插入位置前面的页面，需要改变 toIndex
                indexTemp -= 1
            }
        }
        
        //建立模型
        var tPageItems: [KMThumbnailPageItem] = []
        for index in 0...pageItems.count - 1 {
            let pageItem: KMThumbnailPageItem = pageItems[index]
            let tItem = KMThumbnailPageItem(page: pageItem.page, index: indexTemp + index, oldIndex: pageItem.index)
            tPageItems.append(tItem)
        }
        
        //进行移动
        self.dragPageItems(pageItems: tPageItems)
    }
    
    private func km_resignFirstResponder() {
        NSApp.mainWindow?.makeFirstResponder(self)
    }
    
    //MARK: Noti
    @objc func KMPDFViewCurrentPageDidChangedNotification(notification: NSNotification) {
        if notification.object is CPDFDocument {
            let pdfdocument : CPDFDocument = notification.object as! CPDFDocument
            if pdfdocument.isEqual(self.listView.document) {
                if !isLocalEvent {
    //                DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.3) { [unowned self] in
                        self.pdfCurrentPageChange()
                        self.delegate?.pageDidSelect?(controller: self, pages: [self.listView.currentPageIndex])
    //                }
                }
                isLocalEvent = false
            }
        }
    }
    
    @objc func KMPDFViewPageCountChangedNotification(notification: NSNotification) {
        if notification.object is CPDFDocument {
            let pdfdocument : CPDFDocument = notification.object as! CPDFDocument
            if pdfdocument.isEqual(self.listView.document) {
                if !isLocalEvent {
    //                DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.3) { [unowned self] in
                        self.reloadData()
    //                }
                }
                isLocalEvent = false
            }
        }
    }
    
    @objc func AnnotationDidChangeNoti(notification: NSNotification) {
        if notification.object is CPDFAnnotation {
            let pdfAnnotation : CPDFAnnotation = notification.object as! CPDFAnnotation
            
            if (pdfAnnotation.page != nil) {
                var indexs: IndexSet = IndexSet()
                indexs.insert(IndexSet.Element(pdfAnnotation.page.pageIndex()))
                self.reloadDataAtIndexs(indexs: indexs)
            }
        }
    }
    
    @objc func PDFViewEditingAreaDidChangedNotification(notification: NSNotification) {
        if notification.object is CPDFDocument {
            let pdfdocument : CPDFDocument = notification.object as! CPDFDocument
            if pdfdocument.isEqual(self.listView.document) {
                var indexs: IndexSet = IndexSet()
                indexs.insert(IndexSet.Element(self.listView.currentPageIndex))
                self.reloadDataAtIndexs(indexs: indexs)
            }
        }
    }
    
    func pdfCurrentPageChange () {
        if self.listView.document.pageCount == 0 {
            return
        }
        let insertIndex: Int = self.listView.currentPageIndex;
        var indexs: IndexSet = IndexSet()
        indexs.insert(insertIndex)
        self.selectPages(indexs: indexs)
//        self.thumbnailView.collectionView.scrollToItems(at: self.thumbnailView.collectionView.selectionIndexPaths, scrollPosition: NSCollectionView.ScrollPosition.centeredVertically)
    }
    
    //MARK: menu Action
    
    @IBAction func insertPageItemAction(menu:NSMenuItem) {
        if menu.tag == 0 {
            self.item_insertFile(sender: menu)
        } else if menu.tag == 1 {
            self.item_insertBankPage(sender: menu)
        } else if menu.tag == 2 {
            self.item_insertPage(sender: menu)
        }
    }
 
    @objc private func item_insertFile(sender: NSMenuItem?) {
        let panel = NSOpenPanel()
        panel.allowedFileTypes = ["pdf"]
        panel.beginSheetModal(for: self.view.window!) { [weak self] response in
            if (response == .cancel) {
                return
            }
            /// 处理page
            let insertIndex: Int = self!.thumbnailView.collectionView.selectionIndexes.last!
            let doucument = CPDFDocument(url: panel.url)
            if let data = doucument?.isLocked, data {
                KMPasswordInputWindow.openWindow(window: self!.view.window!, url: panel.url!) { [weak self] result, password in
                    if (result == .cancel) {
                        return
                    }
                    
                    doucument?.unlock(withPassword: password)
                    var newInsertIndex: Int = insertIndex + 1
                    var pages: [CPDFPage] = []
                    var indexs: IndexSet = IndexSet()
                    for i in 0 ..< doucument!.pageCount {
                        let page = doucument?.page(at: i)
                        pages.append(page!)
                        indexs.insert(newInsertIndex)
                        newInsertIndex += 1
                    }
                    self?.insertPagesForDescSort(pages: pages, indexs: indexs)
                }
            } else {
                var newInsertIndex: Int = insertIndex + 1
                var pages: [CPDFPage] = []
                var indexs: IndexSet = IndexSet()
                for i in 0 ..< doucument!.pageCount {
                    let page = doucument?.page(at: i)
                    pages.append(page!)
                    indexs.insert(newInsertIndex)
                    newInsertIndex += 1
                }
                self?.insertPagesForDescSort(pages: pages, indexs: indexs)
            }
       
        }
    }
    
    @objc private func item_insertBankPage(sender: NSMenuItem?) {
        let insertIndex: Int = self.thumbnailView.collectionView.selectionIndexes.last!
        let page = self.listView?.document.page(at: UInt(insertIndex))
        let document = CPDFDocument()
        document?.insertPage((page?.bounds.size)!, at: 0)
        let newPage: CPDFPage = (document?.page(at: 0))!
        self.insertPagesForDescSort(pages: [newPage], indexs: IndexSet(integer: insertIndex+1))
    }
    
    @objc private func item_insertPage(sender: NSMenuItem?) {
        let windowController = KMPageEditInsertCustomPageWindowController(windowNibName: "KMPageEditInsertCustomPageWindowController")
        let insertIndex: Int = self.thumbnailView.collectionView.selectionIndexes.last!
        let page = self.listView?.document.page(at: UInt(insertIndex))
        if (self.thumbnailView.collectionView.selectionIndexes.count > 0) {
            windowController.selectedPageSize = page!.bounds.size
        }
        
        self.view.window?.beginSheet(windowController.window!, completionHandler: { response in})
        
        windowController.itemClick = {
            [weak self] (index: Int) in
            
            if (index == 1) { /// 取消
                self?.view.window?.endSheet((windowController.window)!)
                return
            }
            
            /// 插入
            /// 样式
            let windowController_Insert: KMPageEditInsertCustomPageWindowController = windowController
            let type = windowController_Insert.typeIndex
            
            /// 页面大小
            let pageSize = windowController_Insert.pageSize
            
            /// 方向
            let direction = windowController_Insert.direction
            
            /// 插入位置
            let insertIndex: Int = insertIndex
            if (type == 1) { /// 空白页
                let document = CPDFDocument()
                document?.insertPage(pageSize, at: 0)
                let page: CPDFPage = (document?.page(at: 0))!
                
                if (direction == 0) { /// 纵向
                    page.rotation = 90
                }

                self?.insertPagesForDescSort(pages: [page], indexs: IndexSet(integer: insertIndex+1))
            } else {
                let document = CPDFDocument()
                var imageName = "plaid"
                if (type == 2) {
                    imageName = "horizontal_line"
                } else if (type == 3) {
                    imageName = "five_line_score"
                }
                let imagePath = Bundle.main.pathForImageResource(imageName)
                document?.insertPage(pageSize, withImage: imagePath, at: 0)
                let page: CPDFPage = (document?.page(at: 0))!
                if (direction == 0) { /// 纵向
                    page.rotation = 90
                }

                self?.insertPagesForDescSort(pages: [page], indexs: IndexSet(integer: insertIndex+1))
            }
            
            self?.view.window?.endSheet((windowController.window)!)
        }
    }
    
    @objc private func insertPagesForDescSort(pages: Array<CPDFPage>, indexs: IndexSet) {

        self.insertPages(pages: pages, indexs: indexs)
        
        /// 选中插入的页面
        self.selectPages(indexs: indexs)
    }
    
    func selectPages(indexs: IndexSet, needScroll: Bool = true) {
        var selectPages: [Int] = []
        for index in indexs {
            selectPages.append(index+1)
        }
        DispatchQueue.main.async {
            var data = Set<IndexPath>()
            for index in selectPages {
                data.insert(IndexPath(item: index-1, section: 0))
            }
            
            if self.thumbnailView != nil {
                self.thumbnailView.collectionView.deselectAll(nil)
                if needScroll {
                    self.thumbnailView.collectionView.selectItems(at: data, scrollPosition: .centeredVertically)
                } else {
                    self.thumbnailView.collectionView.selectItems(at: data, scrollPosition: NSCollectionView.ScrollPosition())
                }
            }
        }
    }
    
    /// MARK: indexs 需要降序排序后
    @objc private func insertPages(pages: Array<CPDFPage>, indexs: IndexSet) {
        var count: Int = 0
        for index in indexs {
            if (count >= pages.count) {
                break
            }
//            let newPage = pages[count].copy() as? CPDFPage
            let newPage = pages[count]
//            if (newPage == nil) {
//                continue
//            }
            
            self.listView?.document.insertPageObject(newPage, at: UInt(index))
            count += 1
        }
        
//        self.listView.undoManager?.registerUndo(withTarget: self, selector: #selector(deletePages), object: indexs)
        // 设置文档已编辑
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.7, execute: {
            self.setDocumentEditedState(window: self.view.window)
        })
        
        (self.listView.undoManager?.prepare(withInvocationTarget: self) as AnyObject).deletePages(indexs: indexs)
        
        self.listView?.layoutDocumentView()
        self.thumbnailView.reloadData()
    }
    
    /// MARK: indexs 需要降序排序后
    /// dynamic 动态派发
    @objc private dynamic func deletePages(indexs: IndexSet) {
        var array: Array<CPDFPage> = []
        for i in indexs {
            array.append((self.listView?.document.page(at: UInt(i)))!)
        }
        self.listView?.document.removePage(at: indexs)
        
        self.listView.undoManager?.registerUndo(withTarget: self) { target in
            target.insertPages(pages: array, indexs: indexs)
        }

        self.listView?.layoutDocumentView()
        self.thumbnailView.reloadData()
    }
    
    
    @IBAction func rotatePageItemAction(menu:NSMenuItem) {
        Task { @MainActor in
            let indexs = self.thumbnailView.collectionView.selectionIndexes
            let indexPaths = self.thumbnailView.collectionView.selectionIndexPaths
            if indexs.count >= 0 {
                var pageItems: [KMThumbnailPageItem] = []
                let newDocument = self.thumbnailView.document
                for index in indexs {
                    let page : CPDFPage = (newDocument?.page(at: UInt(index)))!
                    var rotation = page.rotation
                    if rotation == 0 {
                        rotation = 90
                    } else if rotation == 90 {
                        rotation = 180
                    } else if rotation == 180 {
                        rotation = 270
                    } else if rotation == 270 {
                        rotation = 0
                    }
                    
                    let pageItem = KMThumbnailPageItem(page: page, rotate: rotation, oldRotate: page.rotation)
                    pageItems.append(pageItem)
                }
                self.rotatePageItems(pageItems: pageItems, indexPaths: indexPaths)
                
                // 事件外面传递
                self.delegate?.controller?(controller: self, itemClick: menu, itemKey: .rightRotate, params: nil)
            }
        }
    }
    
    @IBAction func leftRotatePageItemAction(menu:NSMenuItem) {
        Task { @MainActor in
            let indexs = self.thumbnailView.collectionView.selectionIndexes
            let indexPaths = self.thumbnailView.collectionView.selectionIndexPaths
            if indexs.count >= 0 {
                var pageItems: [KMThumbnailPageItem] = []
                let newDocument = self.thumbnailView.document
                for index in indexs {
                    let page : CPDFPage = (newDocument?.page(at: UInt(index)))!
                    var rotation = page.rotation
                    if rotation == 0 {
                        rotation = 270
                    } else if rotation == 90 {
                        rotation = 0
                    } else if rotation == 180 {
                        rotation = 90
                    } else if rotation == 270 {
                        rotation = 180
                    }
                    let pageItem = KMThumbnailPageItem(page: page, rotate: rotation, oldRotate: page.rotation)
                    pageItems.append(pageItem)
                }
                self.rotatePageItems(pageItems: pageItems, indexPaths: indexPaths)
                
                // 事件外面传递
                self.delegate?.controller?(controller: self, itemClick: menu, itemKey: .leftRotate, params: nil)
            }
        }
    }
    
    @IBAction func extractPageItemAction(menu:NSMenuItem) {
        let index = (self.thumbnailView.collectionView.selectionIndexes).first ?? -1
        if Int(index) >= 0 {
            let newDocument = self.thumbnailView.document
            let page : CPDFPage = (newDocument?.page(at: UInt(index)))!
            let filename : String = (newDocument?.documentURL.lastPathComponent)!
            let pageIndex = newDocument!.index(for: page) + 1
            var newfileName : String = "\(NSString(string: filename).deletingPathExtension)  page  \(pageIndex)"
            newfileName = "\(newfileName)\(filename.extension)"
            let panel = NSSavePanel()
            panel.nameFieldStringValue = newfileName
            panel.canCreateDirectories = true
            panel.allowedFileTypes = ["pdf"]
            panel.isExtensionHidden = true
            panel.beginSheetModal(for: self.view.window!) { result in
                if result == .OK {
                    let pdfdocument = CPDFDocument()
                    let ret = pdfdocument!.importPages((self.thumbnailView.collectionView.selectionIndexes), from: self.thumbnailView.document, at: 0)
                    if ret {
                        let success = pdfdocument!.write(to:panel.url)
                        if success {
                            let workspace = NSWorkspace.shared
                            workspace.activateFileViewerSelecting([panel.url!])
                        }
                    }
                }
            }
                           
        }
    }
    
    @IBAction func pageEditItemAction(menu:NSMenuItem) {
        var indexs: [Int] = []
        for index in self.thumbnailView.collectionView.selectionIndexes {
            indexs.append(index)
        }
        self.delegate?.gotoPageEdit?(thumbnailViewController: self, pages: indexs)
    }
    
    @IBAction func deletePageItemAction(menu:NSMenuItem) {
        Task { @MainActor in
            let indexs = self.thumbnailView.collectionView.selectionIndexes
            if indexs.count > 0 {
                self.deletePageItemWithIndexs(indexs: indexs)
                // 事件外面传递
                self.delegate?.controller?(controller: self, itemClick: menu, itemKey: .delete, params: nil)
            }
        }
    }
    
    @objc func showPageSizeItemAction(menu: NSMenuItem) {
        self.thumbnailView.isShowPageSize = !self.thumbnailView.isShowPageSize
        
        let indexpaths = self.thumbnailView.selectionIndexPaths
        self.reloadData()
        self.thumbnailView.selectionIndexPaths = indexpaths
    }
    
    @IBAction func sharePageItemAction(menu:NSMenuItem) {
//        let item = menu.parent!
        let index = (self.thumbnailView.collectionView.selectionIndexes).first ?? -1
        if Int(index) >= 0 {
            let doucument = self.thumbnailView.document
//            let page = doucument?.page(at: UInt(index))
            let filename : String = (doucument?.documentURL.lastPathComponent)!
            let folderPath = (NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.applicationSupportDirectory, FileManager.SearchPathDomainMask.userDomainMask, true).last?.stringByAppendingPathComponent(filename))!
            try? FileManager.default.removeItem(atPath: folderPath)
            let pdfdocument = CPDFDocument()
            let ret = pdfdocument!.importPages((self.thumbnailView.collectionView.selectionIndexes), from: self.thumbnailView.document, at: 0)
            let url = URL(fileURLWithPath: folderPath)
            if ret {
                let success = pdfdocument!.write(to:url)
                if success {
                    let workspace = NSWorkspace.shared
                    workspace.activateFileViewerSelecting([url])
                }
            }
            let represent : NSSharingService = menu.representedObject as! NSSharingService
            represent.perform(withItems: [url])
            
        }
    }
    
    @IBAction func copyItemAction(menu:NSMenuItem) {
        Task { @MainActor in
            KMThumbnailManager.manager.copyPages.removeAll()
            let indexs = self.thumbnailView.collectionView.selectionIndexes
            //文件存储用于跨文件page处理
            _ = KMThumbnailManager.manager.copyPages(document: self.thumbnailView.document!, indexs: indexs)
            
            //本地page记录用于本文件page移动处理
            if indexs.count >= 0 {
                for i in indexs {
                    let page = self.thumbnailView.document?.page(at: UInt(i)).copy() as? CPDFPage
                    KMThumbnailManager.manager.copyPages.append(page ?? CPDFPage())
                }
            }
        }
    }
    
    @IBAction func cutItemAction(menu:NSMenuItem) {
        Task { @MainActor in
            KMThumbnailManager.manager.copyPages.removeAll()
            let indexs = self.thumbnailView.collectionView.selectionIndexes
            _ = KMThumbnailManager.manager.copyPages(document: self.thumbnailView.document!, indexs: indexs)
            
            if indexs.count >= 0 {
                for i in indexs {
                    let page = self.thumbnailView.document?.page(at: UInt(i)).copy() as? CPDFPage
                    KMThumbnailManager.manager.copyPages.append(page ?? CPDFPage())
                }
                
                self.deletePageItemWithIndexs(indexs: indexs)
                
                // 事件传递到外面
                self.delegate?.controller?(controller: self, itemClick: menu, itemKey: .cut, params: nil)
            }
        }
    }
    
    @IBAction func pastePageItemAction(menu:NSMenuItem) {
        Task { @MainActor in
            let copyPages = KMThumbnailManager.manager.copyPages
            let page = copyPages.first
            if page?.document  == self.thumbnailView.document {
                var index = (self.thumbnailView.collectionView.selectionIndexes).last ?? -1
                if Int(index) >= 0 && copyPages.count > 0 {
                    var pageItems: [KMThumbnailPageItem] = []
                    for page in copyPages {
                        index = index + 1
                        let pageItem = KMThumbnailPageItem(page: page, index: index, oldIndex: index)
                        pageItems.append(pageItem)
                    }
                    self.addPageItems(pageItems: pageItems)
                    
                    self.selectPages(indexs: IndexSet(integer: index))
                    
                    self.listView.go(toPageIndex: index, animated: true)
                    
                    // 事件传递到外面
                    self.delegate?.controller?(controller: self, itemClick: menu, itemKey: .paste, params: nil)
                }
            } else {
                let index = ((self.thumbnailView.collectionView.selectionIndexes).last ?? self.thumbnailView.collectionView.numberOfItems(inSection: 0) - 1) + 1
                debugPrint("不是同一个document")
                let url = URL(fileURLWithPath: KMThumbnailManager.manager.tempCopyFilePath)
                self.thumbnailView(thumbanView: self.thumbnailView, didDragAddFiles: [url], indexpath: NSIndexPath(forItem: index, inSection: 0) as IndexPath)
            }
        }
    }
    
    @IBAction func printItemAction(menu:NSMenuItem) {
        var indexs:[Int] = []
        for index in self.thumbnailView.collectionView.selectionIndexes {
            indexs.append(index)
        }
        if indexs.count > 0 {
            self.delegate?.controller?(controller: self, itemClick: menu, itemKey: .print, params: indexs)
        }
    }
}

protocol KMThumbnailViewControllerAction {}
extension KMThumbnailViewController: KMThumbnailViewControllerAction {
    @IBAction func cut(_ sender: Any) {
        self.cutItemAction(menu: NSMenuItem())
    }
    
    @IBAction func copy(_ sender: Any) {
        self.copyItemAction(menu: NSMenuItem())
    }
    
    @IBAction func paste(_ sender: Any) {
        self.pastePageItemAction(menu: NSMenuItem())
    }
    
    @IBAction func delete(_ sender: Any) {
        self.deletePageItemAction(menu: NSMenuItem())
        
    }
    
    @IBAction func escButtonAction(_ sender: NSButton) {
        self.cancelSelect()
    }
    
    func cancelSelect() {
        self.selectPages(indexs: [])
        
//        self.km_resignFirstResponder()
    }
}

// MARK: - KMThumbnailViewDelegate

extension KMThumbnailViewController : KMThumbnailViewDelegate {
    func thumbnailView(thumbanView: KMThumbnailView, didSelectItemAt indexpath: IndexPath, object: AnyObject?) {
        guard let event = object as? NSEvent else {
            return
        }
        self.km_resignFirstResponder()
        //是本地触发事件
        self.isLocalEvent = true

        if thumbanView.collectionView.selectionIndexes.count == 1 || (!event.modifierFlags.contains(NSEvent.ModifierFlags.command) &&
                                                                      !event.modifierFlags.contains(NSEvent.ModifierFlags.shift)) {
            let page : CPDFPage = self.listView.document.page(at: UInt(indexpath.item))
            self.listView.go(toPageIndex: Int(page.pageIndex()), animated: true)
            self.thumbnailView.collectionView.deselectAll(nil)
            self.thumbnailView.collectionView.selectionIndexes = IndexSet(integer: IndexSet.Element(indexpath.item))
        }


        var indexs: [Int] = []
        for index in self.thumbnailView.collectionView.selectionIndexes {
            indexs.append(index)
        }
        self.delegate?.pageDidSelect?(controller: self, pages: indexs)
    }

    func thumbnailView(thumbanView: KMThumbnailView, rightMouseDidClick indexpath: IndexPath, item: NSCollectionViewItem?, object: AnyObject?) {
        guard let event = object as? NSEvent else {
            return
        }
        self.addRightMenuItem(view: item as! KMPDFThumbnailItem, event: event)
    }
    
    func thumbnailView(thumbanView: KMThumbnailView, draggingSession session: NSDraggingSession, endedAt screenPoint: NSPoint, dragOperation operation: NSDragOperation) {
        self.isLocalEvent = false
    }

    func thumbnailView(thumbanView: KMThumbnailView, sizeForItemAt indexpath: IndexPath) -> NSSize {
        if self.doublePageMode {
            return NSMakeSize(86, 147)
        } else {
            return NSMakeSize(156, 226)
        }
    }

    func thumbnailView(thumbanView: KMThumbnailView, shouldAcceptDrop draggingInfo: NSDraggingInfo, indexPath: IndexPath, dropOperation: NSCollectionView.DropOperation) -> Bool {
        return true
    }
    
    func thumbnailView(thumbanView: KMThumbnailView, shouldPasteboardWriterForItemAt indexPath: IndexPath) -> Bool {
        return true
    }
    
    func thumbnailView(thumbanView: KMThumbnailView, didDrag dragedIndexPaths: [IndexPath], indexpath: IndexPath, dragInfo: [KMThumbnailViewDragInfoKey.RawValue : Any]) {
        let toIndex = max(0, indexpath.item)
        var indexs = IndexSet()
        for indexpath in dragedIndexPaths {
            indexs.insert(indexpath.item)
        }
        self.dragPagesForDescSort(indexs, toIndex)
        
        self.delegate?.pageDidSelect?(controller: self, pages: [self.listView.currentPageIndex])
    }

    func thumbnailView(thumbanView: KMThumbnailView, insetForSectionAt section: Int) -> NSEdgeInsets {
        if self.doublePageMode {
            return NSEdgeInsets(top: 8, left: 16, bottom: 8, right: 16)
        } else {
            return NSEdgeInsets(top: 8, left: 24, bottom: 8, right: 24)
        }
    }
    
    func thumbnailView(thumbanView: KMThumbnailView, didDragAddFiles files: [URL], indexpath: IndexPath) {
        self.km_add_file_multi(fileUrls: files) { [unowned self] index, params in
            if (self.fetchProgressBlockParamsIsPasswordFile(params: params)) { // 加密文档进度回调
                return
            }
            
            let _fileUrl = self.fetchProgressBlockParamsForFileUrl(params: params)
            if let exn = _fileUrl?.pathExtension, KMTools.isPDFType(exn) {
                if (_fileUrl!.path.isPDFValid() == false) {
                    let alert = NSAlert()
                    alert.alertStyle = .critical
                    alert.messageText = NSLocalizedString("An error occurred while opening this document. The file is damaged and could not be repaired.", comment: "")
                    alert.runModal()
                }
            }
        } completionBlock: { [unowned self] documents in
            debugPrint(indexpath)
            var insertIndex: Int = indexpath.item
            var pages: Array<CPDFPage> = []
            var indexs = IndexSet()
            for document in documents {
                for i in 0 ..< document.pageCount {
                    let page = document.page(at: i)
                    pages.append(page!)
                    indexs.insert(insertIndex)
                    insertIndex += 1
                }
            }
            self.insertPagesForDescSort(pages: pages, indexs: indexs)
        }
    }
}
 
//MARK: NSMenuDelegate
extension KMThumbnailViewController {
    override func validateMenuItem(_ menuItem: NSMenuItem) -> Bool {
        let action = menuItem.action
        if action == #selector(insertPageItemAction) ||
            action == #selector(insertPageItemAction) ||
            action == #selector(deletePageItemAction) ||
            action == #selector(rotatePageItemAction) ||
            action == #selector(leftRotatePageItemAction) ||
            action == #selector(copyItemAction) ||
            action == #selector(cutItemAction) ||
            action == #selector(printItemAction) ||
            action == #selector(sharePageItemAction) ||
            action == #selector(extractPageItemAction) {
            if self.thumbnailView.collectionView.selectionIndexes.count > 0 {
                return true
            } else {
                return false
            }
        }
        
        if action == #selector(pastePageItemAction) {
            if KMThumbnailManager.manager.copyPages.count != 0 {
                return true
            } else {
                return false
            }
        }
        
        if (action == #selector(undo)) {
            return self.listView.undoManager?.canUndo ?? false
        }
        if (action == #selector(redo)) {
            return self.listView.undoManager?.canRedo ?? false
        }
        return true
    }
    
    func addRightMenuItem(view: KMPDFThumbnailItem, event: NSEvent) {
        let index = view.page.pageIndex()
        if !self.thumbnailView.collectionView.selectionIndexes.contains(IndexSet.Element(index)) {
            var indexs: IndexSet = IndexSet()
            indexs.insert(IndexSet.Element(index))
            self.selectPages(indexs: indexs, needScroll: false)
//
//            //PDFView跳转
            self.isLocalEvent = true
            self.listView.go(toPageIndex: Int(view.page.pageIndex()), animated: true)
        }
        
        DispatchQueue.main.async { [unowned self] in 
            let menu = NSMenu()
            var item = NSMenuItem()
    //        item = menu.addItem(withTitle: NSLocalizedString("Insert", comment: ""), action: nil, target: self)
    //        item.representedObject = row
    //
    //        var subMenu = NSMenu()
    //        var subitem = NSMenuItem()
    //        subitem = subMenu.addItem(withTitle: NSLocalizedString("Insert File", comment: ""), action: #selector(insertPageItemAction), target: self, tag:0)
    //        subitem.representedObject = row
    //        subitem = subMenu.addItem(withTitle: NSLocalizedString("Insert blank page", comment: ""), action: #selector(insertPageItemAction), target: self, tag:1)
    //        subitem.representedObject = row
    //        subitem = subMenu.addItem(withTitle: NSLocalizedString("Insert page", comment: ""), action: #selector(insertPageItemAction), target: self, tag:2)
    //        subitem.representedObject = row
    //        item.submenu = subMenu
            
    //        item = menu.addItem(withTitle: NSLocalizedString("Extract", comment: ""), action: #selector(extractPageItemAction), target: self)
            item = menu.addItem(withTitle: NSLocalizedString("Copy", comment: ""), action: #selector(copyItemAction), target: self)!
            item.keyEquivalent = "c"
            item = menu.addItem(withTitle: NSLocalizedString("Cut", comment: ""), action: #selector(cutItemAction), target: self)!
            item.keyEquivalent = "x"
            item = menu.addItem(withTitle: NSLocalizedString("Paste", comment: ""), action: #selector(pastePageItemAction), target: self)!
            item.keyEquivalent = "v"
            
            item = menu.addItem(withTitle: NSLocalizedString("Delete Page", comment: ""), action: #selector(deletePageItemAction), target: self)!
            item.keyEquivalent = String(Unicode.Scalar(NSBackspaceCharacter)!)
            item.keyEquivalentModifierMask = []
            menu.addItem(NSMenuItem.separator())
            item = menu.addItem(withTitle: NSLocalizedString("Page Edit", comment: ""), action: #selector(pageEditItemAction), target: self)!
            
            menu.addItem(NSMenuItem.separator())
            
            item = menu.addItem(withTitle: NSLocalizedString("Rotate Clockwise", comment: ""), action: #selector(rotatePageItemAction), target: self)!
            item = menu.addItem(withTitle: NSLocalizedString("Rotate Counterclockwise", comment: ""), action: #selector(leftRotatePageItemAction), target: self)!
            menu.addItem(NSMenuItem.separator())
            
            if (!self.thumbnailView.isShowPageSize) {
                item = menu.addItem(withTitle: NSLocalizedString("Hide Page Size", comment: ""), action: #selector(showPageSizeItemAction), target: self)!
            } else {
                item = menu.addItem(withTitle: NSLocalizedString("Display Page Size", comment: ""), action: #selector(showPageSizeItemAction), target: self)!
            }
            menu.addItem(NSMenuItem.separator())
            
            item = menu.addItem(withTitle: NSLocalizedString("Print", comment: ""), action: #selector(printItemAction), target: self)!
            
            let point = view.contentBox?.convert(event.locationInWindow, from: nil)
            menu.popUp(positioning: nil, at: point!, in: view.contentBox)
    //        item = menu.addItem(withTitle: NSLocalizedString("Share", comment: ""), action: nil, target: self)
    //        item.representedObject = row
            
    //        item.submenu = NSSharingServicePicker.menu(forSharingItems: [self.listView.document.documentURL ?? ""], subjectContext: "", withTarget: self, selector: #selector(sharePageItemAction), serviceDelegate: nil)
        }
    }
}

//MARK: undoRedo
extension KMThumbnailViewController {
    func rotatePageItems(pageItems: [KMThumbnailPageItem], indexPaths: Set<IndexPath>) {
        let tempPageItems = pageItems
        for pageItem in tempPageItems {
            pageItem.page.rotation = pageItem.rotate
        }
        
        self.listView.layoutDocumentView()
        self.thumbnailView.reloadData()
        self.thumbnailView.collectionView.selectItems(at: indexPaths, scrollPosition: .centeredVertically)
        
        self.listView.undoManager?.registerUndo(withTarget: self) { [unowned self] targetType in
            self.isLocalEvent = true
            //替换下标顺序
            var tempPageItems: [KMThumbnailPageItem] = []
            for pageItem in pageItems {
                let item = KMThumbnailPageItem(page: pageItem.page, rotate: pageItem.oldRotate, oldRotate: pageItem.rotate)
                tempPageItems.append(item)
            }
            self.rotatePageItems(pageItems: tempPageItems, indexPaths: indexPaths)
        }
    }
    
    func deletePageItemWithIndexs(indexs: IndexSet) {
        if (indexs.count == (self.listView?.document.pageCount)!) {
            let _ = CustomAlertView.alertView(message: NSLocalizedString("Unable to delete all pages", comment: ""), fromView: self.thumbnailView, withStyle: .blue)
            return
        }
        
        var pageItems: [KMThumbnailPageItem] = []
        for index in indexs {
            let page = self.listView.document.page(at: UInt(index))?.copy() as? CPDFPage
            if (page == nil) {
                continue
            }
            let pageItem = KMThumbnailPageItem(page: page!, index: index, oldIndex: index, bookMark: self.listView.document.bookmark(forPageIndex: UInt(index)))
            pageItems.append(pageItem)
        }
        self.deletePageItems(pageItems: pageItems)
    }
    
    func deletePageItems(pageItems: [KMThumbnailPageItem]) {
        //移除现有
        var tempPageItems = pageItems
        tempPageItems.sort(){$0.oldIndex > $1.oldIndex}
        for pageItem in tempPageItems {
            self.listView?.document.removePage(at: UInt(pageItem.oldIndex))
        }
        self.listView.layoutDocumentView()
        self.thumbnailView.reloadData()
        self.pdfCurrentPageChange()
        
        self.listView.undoManager?.registerUndo(withTarget: self) { [unowned self] targetType in
            self.isLocalEvent = true
            self.addPageItems(pageItems: tempPageItems)
        }
    }
    
    func addPageItems(pageItems: [KMThumbnailPageItem]) {
        var tempPageItems = pageItems
        tempPageItems.sort(){$0.oldIndex < $1.oldIndex}
        for pageItem in tempPageItems {
            let newPage = pageItem.page
            self.listView?.document.insertPageObject(newPage, at: UInt(pageItem.oldIndex))
        }
        
        for pageItem in tempPageItems {
            if pageItem.bookMark != nil && pageItem.oldIndex < self.listView.document.pageCount {
                self.listView?.document.addBookmark(pageItem.bookMark!.label, forPageIndex: UInt(pageItem.oldIndex))
            }
        }
        
        self.listView.layoutDocumentView()
        self.thumbnailView.reloadData()
        self.pdfCurrentPageChange()
        
        self.listView.undoManager?.registerUndo(withTarget: self) { [unowned self] targetType in
            self.isLocalEvent = true
            self.deletePageItems(pageItems: tempPageItems)
        }
    }
    
    
    func dragPageItems(pageItems: [KMThumbnailPageItem]) {
        var tempPageItems = pageItems
        //按照原下标顺序
        tempPageItems.sort(){$0.oldIndex > $1.oldIndex}
        //移除现有
        for pageItem in tempPageItems {
            self.listView?.document.removePage(at: UInt(pageItem.oldIndex))
        }
        //在原位置添加
        tempPageItems.sort(){$0.index < $1.index}
        for pageItem in tempPageItems {
            let newPage = pageItem.page
            self.listView?.document.insertPageObject(newPage, at: UInt(pageItem.index))
        }
        
        if pageItems.count > 0 {
            self.isLocalEvent = true
            self.selectPages(indexs: IndexSet(integer: pageItems.first!.index))
            self.listView.go(toPageIndex: pageItems.first!.index, animated: true)
        }
        
        // 刷新UI
        self.listView?.layoutDocumentView()
        self.thumbnailView.reloadData()
        
        self.listView.undoManager?.registerUndo(withTarget: self) { [unowned self] targetType in
            //替换下标顺序
            var tempPageItems: [KMThumbnailPageItem] = []
            for pageItem in pageItems {
                let item = KMThumbnailPageItem(page: pageItem.page, index: pageItem.oldIndex, oldIndex: pageItem.index)
                tempPageItems.append(item)
            }
            self.dragPageItems(pageItems: tempPageItems)
        }
    }
    
    @IBAction func undo(_ sender: Any) {
        if (self.listView.undoManager?.canUndo ?? false) {
            self.listView.undoManager?.undo()
        }
    }
    
    @IBAction func redo(_ sender: Any) {
        if (self.listView.undoManager?.canRedo ?? false) {
            self.listView.undoManager?.redo()
        }
    }
}

struct KMThumbnailPageItem {
    var page: CPDFPage
    var index: Int = 0
    var oldIndex: Int = 0
    var rotate: Int = 0
    var oldRotate: Int = 0
    var bookMark: CPDFBookmark?
}