//
//  KMPageEditThumbnailView.swift
//  Cisdem PDFMaster
//
//  Created by tangchao on 2023/1/6.
//

import Cocoa

typealias KMPageEditThumbnailViewSelectionDidChange = (_ selectedIndexs: Set<IndexPath>) -> ()
class KMPageEditThumbnailView: KMPDFThumbnailView {
    var selectionDidChange: KMPageEditThumbnailViewSelectionDidChange?
    
    private let defaultItemSize = NSMakeSize(208, 294)
    private var defaultThumbnailSzie: NSSize?
    
    var area: NSTrackingArea?
    
    override var selectionIndexPaths: Set<IndexPath> {
        get {
            return super.selectionIndexPaths
        }
        set {
            super.selectionIndexPaths = newValue

            // 通知外面
            guard let callback = self.selectionDidChange else {
                return
            }
            callback(self.collectionView.selectionIndexPaths)
        }
    }
    
    override func initDefaultValue() {
        super.initDefaultValue()
        
        self.itemSize = NSMakeSize(208, 294)
        self.defaultThumbnailSzie = self.thumbnailSzie
        self.isShowPageSize = true
        
        self.collectionView.km.register(cell: KMPageEditThumbnailItem.self)
        self.collectionView.allowsMultipleSelection = true
    }
    
    func selectPages(at indexpaths: Set<IndexPath>) {
        self.selectionIndexPaths = indexpaths
    }
    
    public func canZoomOut() -> Bool {
        return self.itemSize.width <= self.defaultItemSize.width
    }
    
    public func zoomOut() {
        if (self.canZoomOut() == false) {
            return
        }
        let indexpaths = self.collectionView.selectionIndexPaths

        if (self.itemSize.width < self.defaultItemSize.width) {
            self.itemSize = self.defaultItemSize
            self.thumbnailSzie = self.defaultThumbnailSzie!
        } else if (self.itemSize.width == self.defaultItemSize.width) {
            self.itemSize = NSSize(width: self.defaultItemSize.width*1.5, height: self.defaultItemSize.height*1.5)
            self.thumbnailSzie = NSSize(width: self.defaultThumbnailSzie!.width*1.5, height: self.defaultThumbnailSzie!.height*1.5)
        }
        
        self.reloadData()
        self.collectionView.selectionIndexPaths = indexpaths
    }
    
    public func canZoomIn() -> Bool {
        return self.itemSize.width >= self.defaultItemSize.width
    }
    public func zoomIn() {
        if (self.canZoomIn() == false) {
            return
        }
        let indexpaths = self.collectionView.selectionIndexPaths

        if (self.itemSize.width > self.defaultItemSize.width) {
            self.itemSize = self.defaultItemSize
            self.thumbnailSzie = self.defaultThumbnailSzie!
        } else if (self.itemSize.width == self.defaultItemSize.width) {
            self.itemSize = NSSize(width: self.defaultItemSize.width*0.5, height: self.defaultItemSize.height*0.5)
            self.thumbnailSzie = NSSize(width: self.defaultThumbnailSzie!.width*0.5, height: self.defaultThumbnailSzie!.height*0.5)
        }
        
        self.reloadData()
        self.collectionView.selectionIndexPaths = indexpaths
    }
    
    override func updateTrackingAreas() {
        super.updateTrackingAreas()

        if let _area = self.area, _area.rect.isEmpty == false {
            if (_area.rect.equalTo(self.bounds)) {
                return
            }
        }
        
        if (self.area != nil) {
            self.removeTrackingArea(self.area!)
            self.area = nil
        }
        
        self.area = NSTrackingArea(rect: self.bounds, options: [.mouseEnteredAndExited, .mouseMoved, .activeAlways], owner: self)
        self.addTrackingArea(self.area!)
//        self.addTrackingRect(self.bounds, owner: self, userData: nil, assumeInside: false)
    }
    
    override func mouseMoved(with event: NSEvent) {
        super.mouseMoved(with: event)
        
        self.window?.mouseMoved(with: event)
    }
}

extension KMPageEditThumbnailView {
    override func collectionView(_ collectionView: NSCollectionView, didSelectItemsAt indexPaths: Set<IndexPath>) {
        super.collectionView(collectionView, didSelectItemsAt: indexPaths)
        
        DispatchQueue.main.async {
            guard let callback = self.selectionDidChange else {
                return
            }
            callback(collectionView.selectionIndexPaths)
        }
    }
    
    override func collectionView(_ collectionView: NSCollectionView, didDeselectItemsAt indexPaths: Set<IndexPath>) {
        super.collectionView(collectionView, didDeselectItemsAt: indexPaths)
    
        DispatchQueue.main.async {
            guard let callback = self.selectionDidChange else {
                return
            }
            callback(collectionView.selectionIndexPaths)
        }
    }
}