//
//  KMSplitPDFViewController.swift
//  PDF Reader Pro
//
//  Created by Niehaoyu on 2024/10/29.
//

import Cocoa
import KMComponentLibrary

@objc protocol KMSplitPDFViewControllerDelegate: AnyObject {
    
    @objc optional func splitPDFViewControllerDidUpdateFilePath(_ controller: KMSplitPDFViewController)
    
    @objc optional func splitPDFViewControllerDidUpdatePDFScale(_ controller: KMSplitPDFViewController)
    
    @objc optional func splitPDFViewControllerDidUpdatePDFPageIndex(_ controller: KMSplitPDFViewController)
 
}

class KMSplitPDFViewController: NSViewController {

    @IBOutlet var contendView: NSView!
    
    @IBOutlet var emptyView: ComponentEmpty!
     
    @IBOutlet var splitToolbar: KMPageNumberPromptView!
    
    var pdfView: CPDFListView?
    var viewManager: KMPDFViewManager?
    
    var inPDFFirst: Bool = false
    var outPDFFirst: Bool = false

    weak open var delegate: KMSplitPDFViewControllerDelegate?

    deinit {
        pdfView?.removeFromSuperview()
        
        KMPrint(self.className + " deinit.")

    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do view setup here.
        
        view.wantsLayer = true
        view.layer?.backgroundColor = ComponentLibrary.shared.getComponentColorFromKey("colorBg/layout-low").cgColor
         
        setupProperty()
        
        reloadData()
    }
    
    func setupProperty() {
        emptyView.properties = ComponentEmptyProperty(emptyType: .add_File,
                                                      text: KMLocalizedString("No Recently Opened Files"),
                                                      subText: KMLocalizedString("Click Open File or drag-and-drop file here to open them."))
        emptyView.setTarget(self, action: #selector(emptyViewAddFileClicked(_:)))
        
        if pdfView == nil {
            pdfView = CPDFListView.init()
        }
        pdfView?.frame = contendView.bounds
        pdfView?.delegate = self
        pdfView?.autoresizingMask = [.width, .height]
        contendView.addSubview(pdfView!, positioned: .below, relativeTo: splitToolbar)
        
    }
    
    func reloadData() {
        if let fileURL = viewManager?.splitPDFFileURL {
            emptyView.isHidden = true
            pdfView?.isHidden = false
            
            let document = CPDFDocument(url: fileURL)
            let isLocked = document?.isLocked ?? false
            if isLocked {
                if let pw = viewManager?.splitPDFFilePassword {
                    document?.unlock(withPassword: pw)
                }
            }
            pdfView?.document = document
             
        } else {
            emptyView.isHidden = false
            pdfView?.isHidden = true
         }
        
        refreshToolbarState()
    }
    
    func refreshToolbarState() {
        if viewManager?.splitShowBottomBar == true &&
            viewManager?.splitPDFFileURL != nil {
            
            splitToolbar.isHidden = false
            
            splitToolbar.pdfView = self.pdfView
            
            reloadToolbarInfo()
        } else {
            splitToolbar.isHidden = true
            
        }
    }
    
    func reloadToolbarInfo() {
        splitToolbar.reloadData()
        
    }
    
    @objc func emptyViewAddFileClicked(_ sender: NSView) {
        let openPanel = NSOpenPanel()
        openPanel.allowedFileTypes = ["pdf", "PDF"]
        openPanel.allowsMultipleSelection = false
        openPanel.beginSheetModal(for: self.view.window!) { [weak self] result in
             if result == NSApplication.ModalResponse.OK {
                 if let url = openPanel.url {
                     guard let weakSelf = self else { return }
                     
                     weakSelf.viewManager?.splitPDFFileURL = url
                     
                     let document = CPDFDocument(url: url)
                     let isLocked = document?.isLocked ?? false
                     if isLocked {
                         
                     }
                     weakSelf.reloadData()
                     
                     weakSelf.delegate?.splitPDFViewControllerDidUpdateFilePath?(weakSelf)
                 }
            }
        }
    }
    
}

//MARK: - CPDFViewDelegate PDFView代理
extension KMSplitPDFViewController: CPDFViewDelegate {
    func pdfViewDocumentDidLoaded(_ pdfView: CPDFView!) {
        reloadToolbarInfo()

    }
    
    func pdfViewCurrentPageDidChanged(_ pdfView: CPDFView!) {
        reloadToolbarInfo()
        
        if viewManager?.splitSyncScroll == true {
            if inPDFFirst == false && outPDFFirst == false {
                inPDFFirst = true
                delegate?.splitPDFViewControllerDidUpdatePDFPageIndex?(self)
                
                NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(pdfUpdatedFinish), object: nil)
                self.perform(#selector(pdfUpdatedFinish), with: nil, afterDelay: 1)
                
            } else if inPDFFirst == true {
                delegate?.splitPDFViewControllerDidUpdatePDFPageIndex?(self)
                
                NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(pdfUpdatedFinish), object: nil)
                self.perform(#selector(pdfUpdatedFinish), with: nil, afterDelay: 1)
            }
        }
        
    }
    
    func pdfViewScaleDidChanged(_ pdfView: CPDFView!) {
        reloadToolbarInfo()
        
        if viewManager?.splitSyncScroll == true {
            if inPDFFirst == false && outPDFFirst == false {
                inPDFFirst = true
                
                NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(pdfUpdatedFinish), object: nil)
                self.perform(#selector(pdfUpdatedFinish), with: nil, afterDelay: 1)
                
            } else if inPDFFirst == true {
                delegate?.splitPDFViewControllerDidUpdatePDFScale?(self)
                
                NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(pdfUpdatedFinish), object: nil)
                self.perform(#selector(pdfUpdatedFinish), with: nil, afterDelay: 1)
            }
        }
    }
    
    @objc func pdfUpdatedFinish() {
        inPDFFirst = false
        outPDFFirst = false
         
    }
    
}