//
//  CompareViewController.swift
//  KdanAuto
//
//  Created by 朱东勇 on 2023/2/2.
//

import Foundation
import AppKit
import PDFKit

class CompareViewController: NSViewController, NSTableViewDataSource, NSTableViewDelegate, NSPopoverDelegate {
    
    @IBOutlet var listView : NSTableView!
    
    @IBOutlet var filterBtn : NSButton!
    @IBOutlet var closeBtn : NSButton!
    
    @IBOutlet var progressIndicator : NSProgressIndicator!
    
    var _files : NSArray!
    var _showFiles : NSMutableArray!
    var _popover: NSPopover!
    
    static var sharedCViewController : CompareViewController? = nil
    class func shared() -> CompareViewController {
        if nil == sharedCViewController {
            var objects : NSArray!
            
            Bundle.main.loadNibNamed("CompareViewController", owner: nil, topLevelObjects: &objects)
            
            for tView in objects {
                if let tv = tView as? CompareViewController {
                    sharedCViewController = tv
                }
            }
        }
        
        return sharedCViewController!
    }
    
    override func viewDidLoad() {
        self.listView.register(NSNib.init(nibNamed: NSNib.Name.init(NSString(string: "ImageCompareCellView")),
                                          bundle: Bundle.main), forIdentifier: NSUserInterfaceItemIdentifier.init("ImageCompareCellView"))
    }
    
    // IBAction
    @IBAction func filterSimilarItemAction(_ sender:NSButton) {
        self.setFiles(_files);
    }
    
    @IBAction func exportAction(_ sender:NSButton) {
        if (_files.count == 0) {
            let alert = NSAlert.init()
            alert.messageText = "无测试对比项导出";
            alert.runModal();
            
            return
        }else if (_showFiles.count == 0) {
            let alert = NSAlert.init()
            alert.messageText = "所有对比项均无差异";
            alert.runModal();
            
            return
        }
        
        let savePanel = NSSavePanel.init();
        let checkBox = NSButton(checkboxWithTitle: "过滤无差异项", target: self, action: nil);
        checkBox.state = self.filterBtn.state;
        checkBox.frame = CGRectMake(0, 0, 150, 45);
        
        if #available(macOS 11.0, *) {
            savePanel.allowedContentTypes = [.pdf]
        } else {
            savePanel.allowedFileTypes = ["pdf", "PDF"]
        }
        savePanel.accessoryView = checkBox
        
        if (savePanel.runModal() == .OK) {
            var exportFiles = NSMutableArray()
            
            if (checkBox.state == .on) {
                
                for tfile in NSArray(array: _files) {
                    let file = tfile as! NSMutableDictionary;
                    
                    let degree = file.degree()
                    if (fabs(degree - 100) > 0) {
                        exportFiles.add(file);
                    }
                }
                if (exportFiles.count == 0) {
                    let alert = NSAlert.init()
                    alert.messageText = "所有对比项均无差异";
                    alert.runModal();
                    
                    return
                }
            }else {
                exportFiles = NSMutableArray(array: _files)
            }
            
            let url = savePanel.url!;
            NSLog("\(url)")
            let pdf = PDFDocument.init();
            let needFilter = checkBox.state == .on
            
            self.progressIndicator.isHidden = false;
            self.progressIndicator.doubleValue = 0;
            processNextImages(pdf, index: 0, files:exportFiles, url: url, needFilter: needFilter)
        }
    }
    
    // Save PDF
    func processNextImages(_ pdf:PDFDocument, index:Int32, files:NSMutableArray, url:URL, needFilter:Bool) -> Void {
        let file = files[Int(index)] as! NSMutableDictionary
        
//        NSLog("处理第\(index)页")
        
        // 所有文档均导出
        let cell = ImageCompareCellView.shared()
        cell?.frame = CGRectMake(0, 0, CGRectGetWidth(self.listView.frame), 900);
        cell?.setFileInfo(file);
        
        self.closeBtn.isEnabled = false;
        
        DispatchQueue.global().async {
            autoreleasepool {
                let image = cell?.processCompareImage()
                if (image != nil) {
                    let page = PDFPage.init(image: image!)
                    let nPage = page?.copy() as! PDFPage
                    pdf.insert(nPage, at: pdf.pageCount)
                }
            }
            
            
            let degree = file.degree()
            if (abs(degree - 100) > 0) {
                autoreleasepool {
                    let image = cell?.processCoverImage()
                    if (image != nil) {
                        let page = PDFPage.init(image: image!)
                        let nPage = page?.copy() as! PDFPage
                        pdf.insert(nPage, at: pdf.pageCount)
                    }
                }
            }
            
            if ((index+1) < files.count) {
                DispatchQueue.main.asyncAfter(deadline: DispatchTime.init(uptimeNanoseconds: 100)) {
                    
                    self.progressIndicator.doubleValue = Double(Int(index) * 100/files.count);
                    self.processNextImages(pdf, index: index+1, files: files, url: url, needFilter: needFilter);
                };
            }else {
                DispatchQueue.global().async {
                    autoreleasepool {
                        pdf.write(to: url)
                        
                        DispatchQueue.main.async {
                            self.progressIndicator.isHidden = true;
                            self.progressIndicator.doubleValue = 100.0;
                            
                            self.closeBtn.isEnabled = true;
                            
                            NSWorkspace.shared.activateFileViewerSelecting([url])
                        }
                    }
                }
            }
        }
    }
    
    
    // Show
    func showIn(_ view:NSView, rect:NSRect) {
        if _popover == nil {
            _popover = NSPopover.init()
            _popover.contentViewController = self;
            _popover.delegate = self
        }
        _popover.contentSize = self.view.frame.size
        
        _popover.show(relativeTo: CGRectMake(rect.origin.x,
                                             rect.origin.y - rect.size.height, rect.size.width, rect.size.height/2),
                      of: view, preferredEdge: NSRectEdge.minY)
    }
    
    
    // Getter & Setter
    func setFiles(_ files:NSArray) {
        _files = files
        
        if (self.filterBtn.state == .on) {
            _showFiles = NSMutableArray()
            
            for tfile in NSArray(array: _files) {
                let file = tfile as! NSMutableDictionary;
                
                let degree = file.degree()
                if (fabs(degree - 100) > 0) {
                    _showFiles.add(file);
                }
            }
        }else {
            _showFiles = NSMutableArray (array: _files);
        }
        
        listView.reloadData()
    }
    
    
    // IBAction
    @IBAction func closeAction(_ sender: NSButton) {
        _popover.close()
    }
    
    
    // TableView Delegate
    func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
        return autoreleasepool {
            var cellView = tableView.makeView(withIdentifier: .init("ImageCompareCellView"), owner: nil) as! ImageCompareCellView?
            if (nil == cellView) {
                cellView = ImageCompareCellView.shared() ?? nil
            }
            
            if (_showFiles.count >= row) {
                let fileInfo = _showFiles[row] as! NSMutableDictionary
                
                cellView?.setFileInfo(fileInfo)
            }
            
            return cellView
        }
    }
    
    func selectionShouldChange(in tableView: NSTableView) -> Bool {
        
        return true
    }
    
    func tableView(_ tableView: NSTableView, shouldSelectRow row: Int) -> Bool {
        
        return false
    }
    
    func tableView(_ tableView: NSTableView, shouldSelect tableColumn: NSTableColumn?) -> Bool {
        
        return false
    }
    
    func tableView(_ tableView: NSTableView, mouseDownInHeaderOf tableColumn: NSTableColumn) {
        
    }
    
    func tableView(_ tableView: NSTableView, didClick tableColumn: NSTableColumn) {
        
    }
    
    func tableView(_ tableView: NSTableView, didDrag tableColumn: NSTableColumn) {
        
    }
    
    func tableView(_ tableView: NSTableView, heightOfRow row: Int) -> CGFloat {
        return 900
    }
    
    func tableView(_ tableView: NSTableView, isGroupRow row: Int) -> Bool {
        return false
    }
    
    func tableView(_ tableView: NSTableView, sizeToFitWidthOfColumn column: Int) -> CGFloat {
        return tableView.frame.width
    }
    
    func tableView(_ tableView: NSTableView, rowActionsForRow row: Int, edge: NSTableView.RowActionEdge) -> [NSTableViewRowAction] {
        return []
    }
    
    func tableViewSelectionDidChange(_ notification: Notification) {
        
    }
    
    // TableView Data Source
    func numberOfRows(in tableView: NSTableView) -> Int {
        if nil == _showFiles {
            return 0
        }
        
        return _showFiles.count
    }
    
    //
    func popoverShouldClose(_ popover: NSPopover) -> Bool {
        return true
    }
    
    
}