//
//  KMPresentationTopViewController.swift
//  PDF Reader Pro
//
//  Created by 丁林圭 on 2024/9/23.
//

import Cocoa

@objc public protocol KMPresentationTopViewControllerDelegate: AnyObject {
    @objc optional func presentationTopViewExit(_ presentationTopViewController: KMPresentationTopViewController, withButton: NSButton)
    
    @objc optional func presentationTopViewUndo(_ presentationTopViewController: KMPresentationTopViewController, withButton: NSButton)

    @objc optional func presentationTopViewClear(_ presentationTopViewController: KMPresentationTopViewController, withButton: NSButton)
    
    @objc optional func presentationTopViewType(_ presentationTopViewController: KMPresentationTopViewController, withButton: NSButton,isSeletion:Bool)
    
    @objc optional func presentationTopViewDrawColor(_ presentationTopViewController: KMPresentationTopViewController, withView: NSView,color:NSColor?)
}

public class KMPresentationTopViewController: NSViewController, KMDrawViewDelegate {
    
    @IBOutlet var pageNubLabel: NSTextField!
    @IBOutlet var backButton: NSButton!
    @IBOutlet var forwardButton: NSButton!

    @IBOutlet var undoButton: NSButton!
    @IBOutlet var exitButton: NSButton!
    @IBOutlet var deleteButton: NSButton!
    @IBOutlet var typeButton: NSButton!
    
    public weak var pdfView: CPDFListView?
    
    public var isSelectionPre: Bool = true

    weak var delegate: KMPresentationTopViewControllerDelegate?

    @IBOutlet private weak var textColorPickerView: KMColorPickerView!

    deinit {
        textColorPickerView.target = nil
        textColorPickerView.action = nil
        
        NSColorPanel.shared.setTarget(nil)
        NSColorPanel.shared.setAction(nil)
    }

    public override func viewDidLoad() {
        super.viewDidLoad()

        pageNubLabel.stringValue =  "\((pdfView?.currentPageIndex ?? 0) + 1)/\(pdfView?.document.pageCount ?? 0)"
        
        NotificationCenter.default.addObserver(self, selector: #selector(pageChangedNotification(_:)), name: NSNotification.Name.CPDFViewPageChanged, object: self.pdfView)
        
        textColorPickerView.isCallColorPanelAction = true
        textColorPickerView.noContentString = true
        textColorPickerView.annotationType = .inkColors
        textColorPickerView.isFillColor = true
        textColorPickerView.isOrderWindowAbove = true
        
        self.view.wantsLayer = true
        DistributedNotificationCenter.default().addObserver(self, selector: #selector(themeChanged(notification:)), name: NSNotification.Name("AppleInterfaceThemeChangedNotification"), object: nil)
        updateViewColor()
        
        if(isSelectionPre == false) {
            typeButton.image = NSImage(named: "KMPresentationImageNameType")
        } else {
            typeButton.image = NSImage(named: "KMPresentationImageNameTypeSeletion")
        }

        updatePageState()
        
        pdfView?.presentationDrawView.delegate = self
        undoButton.isEnabled = false

        (self.view as? KMHoverView)?.hoverAction = { view, act in
            if act == .enter {
                NSCursor.arrow.set()
            } else if act == .exit {
                
            } else {
                NSCursor.arrow.set()
            }
        }
    }
    
    // MARK: - Private
   private func updatePageState() {
       if(pdfView?.canGoToNextPage() == true) {
           backButton.isEnabled = true
        } else {
            backButton.isEnabled = false
        }
        
       if(pdfView?.canGoToPreviousPage() == true) {
           forwardButton.isEnabled = true
        } else {
            forwardButton.isEnabled = false
        }
       
    }
    
    private func updateViewColor() {
        let isDark = KMAppearance.isDarkMode()
        if isDark {
            self.view.layer?.backgroundColor = NSColor(hex: "#464646").cgColor
        } else {
            self.view.layer?.backgroundColor = NSColor.white.cgColor
        }
    }
    
    // MARK: - Action
    @IBAction func buttonItemClicked_BackPage(_ sender: NSButton) {
        updatePageState()
        if(pdfView?.canGoToNextPage() == true) {
            pdfView?.goToNextPage(sender)
        }
    }
    
    @IBAction func buttonItemClicked_ForwardPage(_ sender: NSButton) {
        updatePageState()
        if(pdfView?.canGoToPreviousPage() == true) {
            pdfView?.goToPreviousPage(sender)
        }
    }
    
    @IBAction func buttonItemClicked_Undo(_ sender: NSButton) {
        delegate?.presentationTopViewUndo?(self, withButton: sender)
    }
    
    @IBAction func buttonItemClicked_Exit(_ sender: NSButton) {
        delegate?.presentationTopViewExit?(self, withButton: sender)
    }
    
    @IBAction func buttonItemClicked_Delete(_ sender: NSButton) {
        delegate?.presentationTopViewClear?(self, withButton: sender)
    }
    
    @IBAction func buttonItemClicked_Type(_ sender: NSButton) {
        if(isSelectionPre == true) {
            typeButton.image = NSImage(named: "KMPresentationImageNameType")
            isSelectionPre = false
        } else {
            typeButton.image = NSImage(named: "KMPresentationImageNameTypeSeletion")
            isSelectionPre = true

        }
        undoButton.isEnabled = false

        textColorPickerView.decSelectionColorView()
        delegate?.presentationTopViewType?(self, withButton: sender, isSeletion: isSelectionPre)
    }
    
    @IBAction func drawColorPickerViewAction(_ sender: Any) {
         let borderColor = textColorPickerView.color
        if(isSelectionPre == true) {
            typeButton.image = NSImage(named: "KMPresentationImageNameType")
            isSelectionPre = false
        }
        undoButton.isEnabled = false
        
        delegate?.presentationTopViewDrawColor?(self, withView: textColorPickerView, color: borderColor)
    }
    
    // MARK: - Notification
    @objc func pageChangedNotification(_ notification: Notification) {
        guard let pdfview = notification.object as? CPDFView else {
            return
        }
        if pdfview.document == self.pdfView?.document {
            pageNubLabel.stringValue =  "\((pdfView?.currentPageIndex ?? 0) + 1)/\(pdfView?.document.pageCount ?? 0)"
            updatePageState()
            let presentationDrawView = pdfView?.presentationDrawView
            presentationDrawView?.clear() //
            presentationDrawView?.resetUndoManager()
        }
    }
    
    @objc func themeChanged(notification: Notification) {
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
            self.updateViewColor()
        }
    }

    
    // MARK: - KMDrawView
    public func drawView(_ drawView: KMDrawView!, didUpdateUndoStatus enable: Bool) {
        undoButton.isEnabled = enable
    }
    
    public func drawView(_ drawView: KMDrawView!, didDrawEnd point: CGPoint) {
        undoButton.isEnabled = ((pdfView?.presentationDrawView.canUndo()) == true)
    }

}