//
//  KMPDFThumbnailView.swift
//  PDF Master
//
//  Created by lxy on 2022/12/15.
//

class KMPDFThumbnailView: KMThumbnailView {
    var document: CPDFDocument?
    var isShowPageSize = false
    var thumbnailSzie = NSZeroSize
    
    //标记线
    var isNeedMarkerLine: Bool = false
    var markerLineView: NSView = NSView()
    var markBeginIndexes: IndexSet = IndexSet()
    //注释状态
    var annotationShowState: KMAnnotationViewShowType = .none {
        didSet {
            self.collectionView.reloadData()
        }
    }
    //悬浮
    var hoverIndex: Int = -1
    
    override func initDefaultValue() {
        super.initDefaultValue()
        
        self.wantsLayer = true
        self.layer?.backgroundColor = NSColor(hex: "#F7F8FA").cgColor
        
        self.thumbnailSzie = CGSize(width: 120, height: 155)
        self.minimumLineSpacing = 8
        self.register(KMPDFThumbnailItem.self)
    }
    
    override func initSubViews() {
        super.initSubViews()
        
        self.markerLineView.wantsLayer = true
        self.markerLineView.layer?.backgroundColor = NSColor(hex: "#1770F4").cgColor
        self.markerLineView.frame = CGRectMake(0, 0, 100, 2)
        self.collectionView.addSubview(markerLineView)
        self.markerLineView.isHidden = true
    }
}

extension KMPDFThumbnailView {
    override func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> NSSize {
        if let size_ = self.delegate?.thumbnailView?(thumbanView: self, sizeForItemAt: indexPath) {
            return size_
        }
        
        let page = self.document?.page(at: UInt(indexPath.item))
        let height = KMPDFThumbnailItem.sizeToFit(size: self.thumbnailSzie, page: page!, isShow: self.isShowPageSize)
        
        return NSMakeSize(collectionView.frame.size.width - 20, CGFloat(height))
    }
    
    override func collectionView(_ collectionView: NSCollectionView, numberOfItemsInSection section: Int) -> Int {
        if let count = self.document?.pageCount {
            return Int(count)
        }
        return 0
    }
    
    override func collectionView(_ collectionView: NSCollectionView, itemForRepresentedObjectAt indexPath: IndexPath) -> NSCollectionViewItem {
        if let item = self.delegate?.thumbnailView?(thumbanView: self, itemForRepresentedObjectAt: indexPath) {
            return item
        }

        let cellView: KMPDFThumbnailItem = collectionView.makeItem(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: NSStringFromClass(KMPDFThumbnailItem.self)), for: indexPath) as! KMPDFThumbnailItem
        cellView.thumbnailView = self
        if let page_ = self.document?.page(at: UInt(indexPath.item)) {
            cellView.page = page_
        }
        cellView.annotationShowState = self.annotationShowState
        if indexPath.item == hoverIndex {
            cellView.hover = true
        } else {
            cellView.hover = false
        }
        
        cellView.mouseDownAction = { [unowned self] (view, event) in
            self.delegate?.thumbnailView?(thumbanView: self, didSelectItemAt: indexPath, object: event)
        }
        
        cellView.rightMouseDownAction = { [unowned self] (view, event) in
            self.delegate?.thumbnailView?(thumbanView: self, rightMouseDidClick: indexPath, item: view, object: event)
        }
        
        cellView.hoverCallBack = { [unowned self] view, mouseEntered in
            if let _ = self.collectionView.item(at: hoverIndex)?.view {
                let tempCell = self.collectionView.item(at: hoverIndex) as? KMPDFThumbnailItem
                tempCell!.hover = false
            }
            
            if mouseEntered {
                hoverIndex = indexPath.item
                if let _ = self.collectionView.item(at: hoverIndex)?.view {
                    let tempCell = self.collectionView.item(at: hoverIndex) as? KMPDFThumbnailItem
                    tempCell!.hover = true
                }
            } else {
                hoverIndex = -1
            }
        }
        
        return cellView
    }
    
    override func collectionView(_ collectionView: NSCollectionView, draggingSession session: NSDraggingSession, willBeginAt screenPoint: NSPoint, forItemsAt indexes: IndexSet) {
        if self.isNeedMarkerLine {
            self.markBeginIndexes = collectionView.selectionIndexes
        }
        return super.collectionView(collectionView, draggingSession: session, willBeginAt: screenPoint, forItemsAt: indexes)
    }
    
    override func collectionView(_ collectionView: NSCollectionView, validateDrop draggingInfo: NSDraggingInfo, proposedIndexPath proposedDropIndexPath: AutoreleasingUnsafeMutablePointer<NSIndexPath>, dropOperation proposedDropOperation: UnsafeMutablePointer<NSCollectionView.DropOperation>) -> NSDragOperation {
        if self.isNeedMarkerLine {
            if self.markBeginIndexes.count != 0 {
                if !self.markBeginIndexes.contains(proposedDropIndexPath.pointee.item) {
                    //标记线
                    var rect = self.collectionView.frameForItem(at: proposedDropIndexPath.pointee.item)
                    rect.size.height = 2
                    self.markerLineView.frame = rect
                    self.markerLineView.isHidden = false
                }
            }
        }
        
        return super.collectionView(collectionView, validateDrop: draggingInfo, proposedIndexPath: proposedDropIndexPath, dropOperation: proposedDropOperation)
    }
    
    override func collectionView(_ collectionView: NSCollectionView, acceptDrop draggingInfo: NSDraggingInfo, indexPath: IndexPath, dropOperation: NSCollectionView.DropOperation) -> Bool {
        self.markerLineView.isHidden = true
        self.markBeginIndexes = IndexSet()
        
        let pboard = draggingInfo.draggingPasteboard
        if (pboard.availableType(from: [self.localForDraggedTypes]) != nil) {
            let dragIndexPath = self.dragedIndexPaths.first
            if (dragIndexPath == nil) {
                return false
            }
            let dragIndex = dragIndexPath!.item
            let toIndex = max(0, indexPath.item)
            if dragIndex < 0 || dragIndex > self.document!.pageCount {
                return false
            }
            if (toIndex >= self.document!.pageCount) {
                return false
            }

            if dragIndex == toIndex {
                return false
            }

            return super.collectionView(collectionView, acceptDrop: draggingInfo, indexPath: indexPath, dropOperation: dropOperation)
        } else if ((pboard.availableType(from: [.fileURL])) != nil) {
            //获取url
            var array: [URL] = []
            for item: NSPasteboardItem in pboard.pasteboardItems! {
                let string: String = item.string(forType: NSPasteboard.PasteboardType.fileURL)!
                let url = NSURL(string: string)
                ///  MARK: 暂时支持PDF格式
                if (url?.pathExtension?.lowercased() == "pdf") {
                    array.append(url! as URL)
                }
            }
            
            self.delegate?.thumbnailView?(thumbanView: self, didDragAddFiles: array, indexpath: indexPath)
            return true
        }
        
        return false
    }
}