//
//  KMLineWell.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2023/11/6.
//

import Cocoa

private let SKPasteboardTypeLineStyle = "net.sourceforge.skim-app.pasteboard.line-style"

private let SKLineWellLineWidthKey = "lineWidth"
private let SKLineWellStyleKey = "style"
private let SKLineWellDashPatternKey = "dashPattern"
private let SKLineWellStartLineStyleKey = "startLineStyle"
private let SKLineWellEndLineStyleKey = "endLineStyle"

private let ACTION_KEY = "action"
private let TARGET_KEY = "target"
private let DISPLAYSTYLE_KEY = "lwFlagsdisplayStyle"
private let ACTIVE_KEY = "active"

private let SKLineWellWillBecomeActiveNotification = "SKLineWellWillBecomeActiveNotification"
private let EXCLUSIVE_KEY = "exclusive"

enum KMLineWellDisplayStyle: Int {
    case line = 0
    case simpleLine
    case rectangle
    case oval
}

class KMLineWell: NSControl {
    
    public static let widthKey                              = SKLineWellLineWidthKey
    public static let styleKey                              = SKLineWellStyleKey
    public static let dashPatternKey                        = SKLineWellDashPatternKey
    public static let startLineStyleKey                     = SKLineWellStartLineStyleKey
    public static let endLineStyleKey                       = SKLineWellEndLineStyleKey
    
    public static let lineStylePboardTypeString             = SKPasteboardTypeLineStyle
    public static let lineStylePboardType                   = NSPasteboard.PasteboardType(rawValue: SKPasteboardTypeLineStyle)
    
    private var _lineWidth: CGFloat = 2
    var lineWidth: CGFloat {
        get {
            return self._lineWidth
        }
        set {
            if (abs(self._lineWidth - newValue) > 0.00001) {
                self._lineWidth = newValue
                self._changedValue(forKey: SKLineWellLineWidthKey)
            }
        }
    }
    private var _style: CPDFBorderStyle = .solid
    var style: CPDFBorderStyle {
        get {
            return self._style
        }
        set {
            if (newValue != self._style) {
                self._style = newValue
                self._changedValue(forKey: SKLineWellStyleKey)
            }
        }
    }
    private var _startLineStyle: CPDFLineStyle = .none
    var startLineStyle: CPDFLineStyle {
        get {
            return self._startLineStyle
        }
        set {
            if (newValue != self._startLineStyle) {
                self._startLineStyle = newValue
                self._changedValue(forKey: SKLineWellStartLineStyleKey)
            }
        }
    }
    private var _endLineStyle: CPDFLineStyle = .none
    var endLineStyle: CPDFLineStyle {
        get {
            return self._endLineStyle
        }
        set {
            if (newValue != self._endLineStyle) {
                self._endLineStyle = newValue
                self._changedValue(forKey: SKLineWellEndLineStyleKey)
            }
        }
    }
    private var _dashPattern: NSArray?
    var dashPattern: NSArray? {
        get {
            return self._dashPattern
        }
        set {
            var _pattern: NSArray? = newValue
            if (NSIsControllerMarker(_pattern)) {
                _pattern = nil
            }
            if _pattern?.isEqual(to: self._dashPattern) == false && _pattern != nil || self._dashPattern != nil {
                self._dashPattern = _pattern
                self._changedValue(forKey: SKLineWellDashPatternKey)
            }
        }
    }
    
    var displayStyle: KMLineWellDisplayStyle {
        get {
            return KMLineWellDisplayStyle(rawValue: Int(__lwFlags.displayStyle)) ?? .line
        }
        set {
            if __lwFlags.displayStyle != newValue.rawValue {
                __lwFlags.displayStyle = UInt8(newValue.rawValue)
                self.needsDisplay = true
            }
        }
    }
    
    private struct _lwFlags {
        var displayStyle: UInt8 = 0
        var active = false
        var canActivate = false
        var existsActiveLineWell: UInt8 = 0
        var highlighted: Bool = false
    }
    
    private var __lwFlags = _lwFlags()
    
    var canActivate: Bool {
        get {
            return __lwFlags.canActivate
        }
        set {
            if __lwFlags.canActivate != newValue {
                __lwFlags.canActivate = newValue
                if self.isActive && __lwFlags.canActivate == false {
                    self._deactivate()
                }

            }
        }
    }
    
    var isActive: Bool {
        get {
            return __lwFlags.active
        }
    }
    
    override var isHighlighted: Bool {
        get {
            return self.__lwFlags.highlighted
        }
        set {
            if self.__lwFlags.highlighted != newValue {
                self.__lwFlags.highlighted = newValue
            }
        }
    }
    
    private var _pri_target: AnyObject?
    private var _pri_action: Selector?
    
    deinit {
        KMPrint("KMLineWell deinit.")
        
        NotificationCenter.default.removeObserver(self)
    }
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
        lineWidth = 1.0
        style = .solid
        dashPattern = nil;
        startLineStyle = .none
        endLineStyle = .none
        __lwFlags.displayStyle = UInt8(KMLineWellDisplayStyle.line.rawValue)
        __lwFlags.active = false
        __lwFlags.canActivate = false
        __lwFlags.existsActiveLineWell = 0
        
        self.target = nil
        self.action = nil
        
        self._commonInit()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        lineWidth = coder.decodeDouble(forKey: SKLineWellLineWidthKey)
        style = CPDFBorderStyle(rawValue: coder.decodeInteger(forKey: SKLineWellStyleKey)) ?? .solid
        dashPattern = coder.decodeObject(forKey: SKLineWellDashPatternKey) as? NSArray
        startLineStyle = CPDFLineStyle(rawValue: coder.decodeInteger(forKey: SKLineWellStartLineStyleKey)) ?? .none
        endLineStyle = CPDFLineStyle(rawValue: coder.decodeInteger(forKey: SKLineWellEndLineStyleKey)) ?? .none
        
        __lwFlags.displayStyle = UInt8(coder.decodeInteger(forKey: DISPLAYSTYLE_KEY))
        __lwFlags.active = coder.decodeBool(forKey: ACTIVE_KEY)
        action =  NSSelectorFromString(coder.decodeObject(forKey: ACTION_KEY) as? String ?? "")
        target = coder.decodeObject(forKey: TARGET_KEY) as AnyObject?
        
        self._commonInit()
    }
    
    override func encode(with coder: NSCoder) {
        super.encode(with: coder)
        
        coder.encode(lineWidth, forKey: SKLineWellLineWidthKey)
        coder.encode(style.rawValue, forKey: SKLineWellStyleKey)
        
        coder.encode(dashPattern, forKey: SKLineWellDashPatternKey)
        coder.encode(startLineStyle.rawValue, forKey: SKLineWellStartLineStyleKey)
        coder.encode(endLineStyle.rawValue, forKey: SKLineWellEndLineStyleKey)
        coder.encode(__lwFlags.displayStyle, forKey: DISPLAYSTYLE_KEY)
        coder.encode(__lwFlags.active, forKey: ACTIVE_KEY)
        
        if let data = self.action {
            coder.encode(NSStringFromSelector(data), forKey: ACTION_KEY)
        }
        coder.encode(target, forKey: TARGET_KEY)
    }
    
    override var isOpaque: Bool {
        return true
    }
    
    override var acceptsFirstResponder: Bool {
        return self.canActivate
    }
    
    override func acceptsFirstMouse(for event: NSEvent?) -> Bool {
        return self.canActivate
    }
    
    override func viewWillMove(toWindow newWindow: NSWindow?) {
        self._deactivate()
        super.viewWillMove(toWindow: newWindow)
    }

    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        let bounds = self.bounds
        
        KMDrawTextFieldBezel(bounds, self)
        
        if (self.isActive) {
            NSGraphicsContext.saveGraphicsState()
            NSColor.selectedControlColor.setFill()
            bounds.fill(using: .plusDarker)
            NSGraphicsContext.restoreGraphicsState()
        }
        if (self.isHighlighted) {
            NSGraphicsContext.saveGraphicsState()
            NSColor(calibratedWhite: 0, alpha: 0.1).setFill()
            self.bounds.frame(withWidth: 1, using: .plusDarker)
            NSGraphicsContext.restoreGraphicsState()
        }
        
        if (lineWidth > 0.0) {
            NSGraphicsContext.saveGraphicsState()
            NSBezierPath(rect: NSInsetRect(bounds, 2.0, 2.0)).addClip()
            NSColor.black.setStroke()
            self._path().stroke()
            NSGraphicsContext.restoreGraphicsState()
        }
        
        if self.refusesFirstResponder == false && NSApp.isActive && self.isEqual(to: self.window?.firstResponder) {
            if let data = self.window?.isKeyWindow, data {
                NSGraphicsContext.saveGraphicsState()
                NSFocusRingPlacement.only.set()
                bounds.fill()
                NSGraphicsContext.restoreGraphicsState()
            }
        }
    }
    
    override func mouseDown(with event: NSEvent) {
        if (self.isEnabled) {
            self.setKeyboardFocusRingNeedsDisplay(self.bounds)
            self.needsDisplay = true
//            NSUInteger modifiers = [theEvent modifierFlags] & NSDeviceIndependentModifierFlagsMask;
            var modifiers = event.modifierFlags
//            modifiers.insert(.deviceIndependentFlagsMask)
            if modifiers.contains(.deviceIndependentFlagsMask) {
                modifiers.remove(.deviceIndependentFlagsMask)
            }
            var keepOn = true
            var _event: NSEvent = event
            while (keepOn) {
//                theEvent = [[self window] nextEventMatchingMask: NSLeftMouseUpMask | NSLeftMouseDraggedMask];
                if let data = self.window?.nextEvent(matching: [.leftMouseUp, .leftMouseDragged]) {
                    _event = data
                    switch (_event.type) {
                    case .leftMouseDragged:
//                        {
//                            NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:
//                                                            [NSNumber numberWithDouble:lineWidth], , [NSNumber numberWithInteger:style], , dashPattern, , nil];
                            var dict = [SKLineWellLineWidthKey : NSNumber(value: self.lineWidth),
                                        SKLineWellStyleKey : NSNumber(value: self.style.rawValue),
                                        SKLineWellDashPatternKey : self.dashPattern ?? []]
                        if self.displayStyle == .line {
//                            if ([self displayStyle] == SKLineWellDisplayStyleLine) {
                            dict[SKLineWellStartLineStyleKey] = NSNumber(value: self.startLineStyle.rawValue)
                            dict[SKLineWellEndLineStyleKey] = NSNumber(value: self.endLineStyle.rawValue)
                        }
                        
                            let pboard = NSPasteboard(name: .drag)
                        pboard.clearContents()
                        pboard.setPropertyList(dict, forType: Self.lineStylePboardType)
                            
                        let bounds = self.bounds
                        /*beginDraggingSessionWithItems:event:source: instead*/
//                            [self dragImage:[self dragImage] at:bounds.origin offset:NSZeroSize event:theEvent pasteboard:pboard source:self slideBack:YES];
                            keepOn = false
                            break
//                        }
                    case .leftMouseUp:
                        if (self.isActive) {
                            self._deactivate()
                        } else {
//                            [self activate:(modifiers & NSShiftKeyMask) == 0];
                            self._activate(modifiers.contains(.shift) == false)
                        }
                        keepOn = false
                        break
                    default:
                        break
                    }
                }
            }
        }
    }
    
    override func performClick(_ sender: Any?) {
        if (self.isEnabled) {
            if (self.isActive) {
                self._deactivate()
            } else {
                self._activate(true)
            }
        }
        
    }
    
    override var target: AnyObject? {
        get {
            return self._pri_target
        }
        set {
            self._pri_target = newValue
        }
    }
    
    override var action: Selector? {
        get {
            return self._pri_action
        }
        set {
            self._pri_action = newValue
        }
    }
    
    func takeValue(for key: String, from object: AnyObject) {
        if let inspector = object as? KMLineInspector {
            if key == Self.widthKey {
                self.lineWidth = inspector.lineWidth
            } else if key == Self.styleKey {
                self.style = CPDFBorderStyle(rawValue: inspector.style) ?? .solid
            } else if key == Self.startLineStyleKey {
                self.startLineStyle = CPDFLineStyle(rawValue: inspector.startLineStyle) ?? .none
            } else if key == Self.endLineStyleKey {
                self.endLineStyle = CPDFLineStyle(rawValue: inspector.endLineStyle) ?? .none
            } else if key == Self.dashPatternKey {
                self.dashPattern = inspector.dashPattern as NSArray
            }
        }
    }
    
    // MARK: - NSDraggingDestination
//    - (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal {
//        return NSDragOperationGeneric;
//    }

    override func draggingEntered(_ sender: NSDraggingInfo) -> NSDragOperation {
        if self.isEnabled && self.isEqual(to: sender.draggingSource) == false && sender.draggingPasteboard.canReadItem(withDataConformingToTypes: [Self.lineStylePboardTypeString]) {
            self.isHighlighted = true
            self.setKeyboardFocusRingNeedsDisplay(self.bounds)
            self.needsDisplay = true
            return .every
        }
        return NSDragOperation(rawValue: 0)
    }

    override func draggingExited(_ sender: NSDraggingInfo?) {
        if self.isEnabled && self.isEqual(to: sender?.draggingSource) == false {
            if let pboard = sender?.draggingPasteboard, pboard.canReadItem(withDataConformingToTypes: [Self.lineStylePboardTypeString]) {
                self.isHighlighted = false
                self.setKeyboardFocusRingNeedsDisplay(self.bounds)
                self.needsDisplay = true
            }
        }
    }
    
    override func prepareForDragOperation(_ sender: NSDraggingInfo) -> Bool {
        if self.isEnabled == false {
            return self.isEnabled
        }
        if self.isEqual(to: sender.draggingSource) == false {
            return false
        }
        return sender.draggingPasteboard.canReadItem(withDataConformingToTypes: [Self.lineStylePboardTypeString])
    }

    override func performDragOperation(_ sender: NSDraggingInfo) -> Bool {
        let pboard = sender.draggingPasteboard
        _ = pboard.types

        let dict = pboard.propertyList(forType: Self.lineStylePboardType) as? [String : Any]
        if let data = dict?[Self.widthKey] as? NSNumber {
            self.lineWidth = data.floatValue.cgFloat
        } else if let data = dict?[Self.styleKey] as? NSNumber {
            self.style = CPDFBorderStyle(rawValue: data.intValue) ?? .solid
        } else if let data = dict?[Self.dashPatternKey] {
            self.dashPattern = data as? NSArray ?? []
        } else {
            if self.displayStyle == .line || self.displayStyle == .simpleLine {
                if let data = dict?[Self.startLineStyleKey] as? NSNumber {
                    self.startLineStyle = CPDFLineStyle(rawValue: data.intValue) ?? .none
                } else if let data = dict?[Self.endLineStyleKey] as? NSNumber {
                    self.endLineStyle = CPDFLineStyle(rawValue: data.intValue) ?? .none
                }
            }
        }
        self.sendAction(self.action, to: self.target)

        self.isHighlighted = false
        self.setKeyboardFocusRingNeedsDisplay(self.bounds)
        self.needsDisplay = true
        return dict != nil
    }
    
//    - (void)takeValueForKey:(NSString *)key from:(id)object {
//        [self setValue:[object valueForKey:key] forKey:key];
//        NSDictionary *info = [self infoForBinding:key];
//        [[info objectForKey:NSObservedObjectKey] setValue:[self valueForKey:key] forKeyPath:[info objectForKey:NSObservedKeyPathKey]];
//    }

    /*

     + (void)initialize {
     //    SKINITIALIZE;
         
         [self exposeBinding:SKLineWellLineWidthKey];
         [self exposeBinding:SKLineWellStyleKey];
         [self exposeBinding:SKLineWellDashPatternKey];
         [self exposeBinding:SKLineWellStartLineStyleKey];
         [self exposeBinding:SKLineWellEndLineStyleKey];
     }

     - (Class)valueClassForBinding:(NSString *)binding {
         if ([binding isEqualToString:SKLineWellDashPatternKey])
             return [NSArray class];
         else
             return [NSNumber class];
     }

     - (void)dealloc {
     //    SKENSURE_MAIN_THREAD(
             [self unbind:SKLineWellLineWidthKey];
             [self unbind:SKLineWellStyleKey];
             [self unbind:SKLineWellDashPatternKey];
             [self unbind:SKLineWellStartLineStyleKey];
             [self unbind:SKLineWellEndLineStyleKey];
     //    );
         [[NSNotificationCenter defaultCenter] removeObserver:self];
     //    SKDESTROY(dashPattern);
     //    [super dealloc];
     }

     #pragma mark Accessors

     - (SEL)action { return action; }

     - (void)setAction:(SEL)newAction { action = newAction; }

     - (id)target { return target; }

     - (void)setTarget:(id)newTarget { target = newTarget; }

     - (void)setNilValueForKey:(NSString *)key {
         if ([key isEqualToString:SKLineWellLineWidthKey] || [key isEqualToString:SKLineWellStyleKey] ||
             [key isEqualToString:SKLineWellStartLineStyleKey] || [key isEqualToString:SKLineWellEndLineStyleKey]) {
             [self setValue:[NSNumber numberWithInteger:0] forKey:key];
         } else {
             [super setNilValueForKey:key];
         }
     }

     #pragma mark Notification handlers

     #pragma mark NSDraggingSource protocol

     - (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal {
         return NSDragOperationGeneric;
     }

     #pragma mark NSDraggingDestination protocol

     - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender {
         if ([self isEnabled] && [sender draggingSource] != self && [[sender draggingPasteboard] canReadItemWithDataConformingToTypes:[NSArray arrayWithObjects:SKPasteboardTypeLineStyle, nil]]) {
             [self setHighlighted:YES];
             [self setKeyboardFocusRingNeedsDisplayInRect:[self bounds]];
             [self setNeedsDisplay:YES];
             return NSDragOperationEvery;
         } else
             return NSDragOperationNone;
     }

     - (void)draggingExited:(id <NSDraggingInfo>)sender {
         if ([self isEnabled] && [sender draggingSource] != self && [[sender draggingPasteboard] canReadItemWithDataConformingToTypes:[NSArray arrayWithObjects:SKPasteboardTypeLineStyle, nil]]) {
             [self setHighlighted:NO];
             [self setKeyboardFocusRingNeedsDisplayInRect:[self bounds]];
             [self setNeedsDisplay:YES];
         }
     }

     - (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender {
         return [self isEnabled] && [sender draggingSource] != self && [[sender draggingPasteboard] canReadItemWithDataConformingToTypes:[NSArray arrayWithObjects:SKPasteboardTypeLineStyle, nil]];
     }

     - (BOOL)performDragOperation:(id <NSDraggingInfo>)sender{
         NSPasteboard *pboard = [sender draggingPasteboard];
         
         [pboard types];
         
         NSDictionary *dict = [pboard propertyListForType:SKPasteboardTypeLineStyle];
         
         if ([dict objectForKey:SKLineWellLineWidthKey])
             [self takeValueForKey:SKLineWellLineWidthKey from:dict];
         if ([dict objectForKey:SKLineWellStyleKey])
             [self takeValueForKey:SKLineWellStyleKey from:dict];
         [self takeValueForKey:SKLineWellDashPatternKey from:dict];
         if ([self displayStyle] == SKLineWellDisplayStyleLine) {
             if ([dict objectForKey:SKLineWellStartLineStyleKey])
                 [self takeValueForKey:SKLineWellStartLineStyleKey from:dict];
             if ([dict objectForKey:SKLineWellEndLineStyleKey])
                 [self takeValueForKey:SKLineWellEndLineStyleKey from:dict];
         }
         [self sendAction:[self action] to:[self target]];
         
         [self setHighlighted:NO];
         [self setKeyboardFocusRingNeedsDisplayInRect:[self bounds]];
         [self setNeedsDisplay:YES];
         
         return dict != nil;
     }

     #pragma mark Accessibility

     - (NSArray *)accessibilityAttributeNames {
         static NSArray *attributes = nil;
         if (attributes == nil) {
             attributes = [[NSArray alloc] initWithObjects:
             NSAccessibilityRoleAttribute,
             NSAccessibilityRoleDescriptionAttribute,
             NSAccessibilityValueAttribute,
             NSAccessibilityTitleAttribute,
             NSAccessibilityHelpAttribute,
             NSAccessibilityFocusedAttribute,
             NSAccessibilityParentAttribute,
             NSAccessibilityWindowAttribute,
             NSAccessibilityTopLevelUIElementAttribute,
             NSAccessibilityPositionAttribute,
             NSAccessibilitySizeAttribute,
             nil];
         }
         return attributes;
     }

     - (id)accessibilityAttributeValue:(NSString *)attribute {
         if ([attribute isEqualToString:NSAccessibilityRoleAttribute]) {
             return NSAccessibilityCheckBoxRole;
         } else if ([attribute isEqualToString:NSAccessibilityRoleDescriptionAttribute]) {
             return NSAccessibilityRoleDescription(NSAccessibilityCheckBoxRole, nil);
         } else if ([attribute isEqualToString:NSAccessibilityValueAttribute]) {
             return [NSNumber numberWithInteger:[self isActive]];
         } else if ([attribute isEqualToString:NSAccessibilityTitleAttribute]) {
             return [NSString stringWithFormat:@"%@ %ld", NSLocalizedString(@"line width", @"Accessibility description"), (long)[self lineWidth]];
         } else if ([attribute isEqualToString:NSAccessibilityHelpAttribute]) {
             return [self toolTip];
         } else if ([attribute isEqualToString:NSAccessibilityFocusedAttribute]) {
             // Just check if the app thinks we're focused.
             id focusedElement = [NSApp accessibilityAttributeValue:NSAccessibilityFocusedUIElementAttribute];
             return [NSNumber numberWithBool:[focusedElement isEqual:self]];
         } else if ([attribute isEqualToString:NSAccessibilityParentAttribute]) {
             return NSAccessibilityUnignoredAncestor([self superview]);
         } else if ([attribute isEqualToString:NSAccessibilityWindowAttribute]) {
             // We're in the same window as our parent.
             return [NSAccessibilityUnignoredAncestor([self superview]) accessibilityAttributeValue:NSAccessibilityWindowAttribute];
         } else if ([attribute isEqualToString:NSAccessibilityTopLevelUIElementAttribute]) {
             // We're in the same top level element as our parent.
             return [NSAccessibilityUnignoredAncestor([self superview]) accessibilityAttributeValue:NSAccessibilityTopLevelUIElementAttribute];
         } else if ([attribute isEqualToString:NSAccessibilityPositionAttribute]) {
             return [NSValue valueWithPoint:[[self window] convertBaseToScreen:[self convertPoint:[self bounds].origin toView:nil]]];
         } else if ([attribute isEqualToString:NSAccessibilitySizeAttribute]) {
             return [NSValue valueWithSize:[self convertSize:[self bounds].size toView:nil]];
         } else {
             return nil;
         }
     }

     - (BOOL)accessibilityIsAttributeSettable:(NSString *)attribute {
         if ([attribute isEqualToString:NSAccessibilityFocusedAttribute]) {
             return [self canActivate];
         } else {
             return NO;
         }
     }

     - (void)accessibilitySetValue:(id)value forAttribute:(NSString *)attribute {
         if ([attribute isEqualToString:NSAccessibilityFocusedAttribute]) {
             [[self window] makeFirstResponder:self];
         }
     }


     // actions

     - (NSArray *)accessibilityActionNames {
         return [NSArray arrayWithObject:NSAccessibilityPressAction];
     }

     - (NSString *)accessibilityActionDescription:(NSString *)anAction {
         return NSAccessibilityActionDescription(anAction);
     }

     - (void)accessibilityPerformAction:(NSString *)anAction {
         if ([anAction isEqualToString:NSAccessibilityPressAction])
             [self performClick:self];
     }


     // misc

     - (BOOL)accessibilityIsIgnored {
         return NO;
     }

     - (id)accessibilityHitTest:(NSPoint)point {
         return NSAccessibilityUnignoredAncestor(self);
     }

     - (id)accessibilityFocusedUIElement {
         return NSAccessibilityUnignoredAncestor(self);
     }

     @end
     */
}

// MARK: - Private Methods

extension KMLineWell {
    private func _commonInit() {
        __lwFlags.canActivate = true
        __lwFlags.existsActiveLineWell = 0
        
        self.isEnabled = true
        
        self.registerForDraggedTypes([Self.lineStylePboardType])
    }
    
    private func _deactivate() {
        if self.isActive {
            NotificationCenter.default.removeObserver(self)
            __lwFlags.active = false
            self.setKeyboardFocusRingNeedsDisplay(self.bounds)
            self.needsDisplay = true
        }
    }
    
    private func _changedValue(forKey key: String) {
        if (self.isActive) {
            //        [[SKLineInspector sharedLineInspector] setValue:[self valueForKey:key] forKey:key];
        }
        self.needsDisplay = true
    }
    
    private func _dragImage() -> NSImage? {
        let bounds = self.bounds
        let path = self.lineWidth > 0.0 ? self._path() : nil
    //    CGFloat scale = [self backingScale];
        let scale = 1.0
        
        let image =  NSImage.bitmapImage(with: bounds.size, scale: scale) { rect in
            KMContextSetAlpha(NSGraphicsContext.current?.cgContext, 0.7)
            NSColor.darkGray.setFill()
            _ = NSRect.fill(NSInsetRect(rect, 1.0, 1.0))
            NSColor.controlBackgroundColor.setFill()
            _ = NSRect.fill(NSInsetRect(rect, 2.0, 2.0))
            NSColor.black.setStroke()
            path?.stroke()
        }
        
        return image
    }
    
    private func _path() -> NSBezierPath {
        let path = NSBezierPath()
        let bounds = self.bounds
        
        if self.displayStyle == .line {
            let offset = 0.5 * lineWidth - floor(0.5 * lineWidth)
            let startPoint = NSMakePoint(NSMinX(bounds) + ceil(0.5 * NSHeight(bounds)), round(NSMidY(bounds)) - offset)
            let endPoint = NSMakePoint(NSMaxX(bounds) - ceil(0.5 * NSHeight(bounds)), round(NSMidY(bounds)) - offset)
            
            switch (self.startLineStyle) {
            case .none:
                break
            case .square:
                path.appendRect(NSMakeRect(startPoint.x - 1.5 * lineWidth, startPoint.y - 1.5 * lineWidth, 3 * lineWidth, 3 * lineWidth))
                break
            case .circle:
                path.appendOval(in: NSMakeRect(startPoint.x - 1.5 * lineWidth, startPoint.y - 1.5 * lineWidth, 3 * lineWidth, 3 * lineWidth))
                break
            case .diamond:
                path.move(to: NSMakePoint(startPoint.x - 1.5 * lineWidth, startPoint.y))
                path.line(to: NSMakePoint(startPoint.x,  startPoint.y + 1.5 * lineWidth))
                path.line(to: NSMakePoint(startPoint.x + 1.5 * lineWidth, startPoint.y))
                path.line(to: NSMakePoint(startPoint.x,  startPoint.y - 1.5 * lineWidth))
                path.close()
                break
            case .openArrow:
                path.move(to: NSMakePoint(startPoint.x + 3.0 * lineWidth, startPoint.y - 1.5 * lineWidth))
                path.line(to: NSMakePoint(startPoint.x,  startPoint.y))
                path.line(to: NSMakePoint(startPoint.x + 3.0 * lineWidth, startPoint.y + 1.5 * lineWidth))
                break
            case .closedArrow:
                path.move(to: NSMakePoint(startPoint.x + 3.0 * lineWidth, startPoint.y - 1.5 * lineWidth))
                path.line(to: NSMakePoint(startPoint.x,  startPoint.y))
                path.line(to: NSMakePoint(startPoint.x + 3.0 * lineWidth, startPoint.y + 1.5 * lineWidth))
                path.close()
                break
            @unknown default:
                fatalError()
            }
            
            path.move(to: startPoint)
            path.line(to: endPoint)
            
            switch (self.endLineStyle) {
            case .none:
                    break
            case .square:
                path.appendRect(NSMakeRect(endPoint.x - 1.5 * lineWidth, endPoint.y - 1.5 * lineWidth, 3 * lineWidth, 3 * lineWidth))
                    break
            case .circle:
                path.appendOval(in: NSMakeRect(endPoint.x - 1.5 * lineWidth, endPoint.y - 1.5 * lineWidth, 3 * lineWidth, 3 * lineWidth))
                    break
            case .diamond:
                path.move(to: NSMakePoint(endPoint.x + 1.5 * lineWidth, endPoint.y))
                path.line(to: NSMakePoint(endPoint.x,  endPoint.y + 1.5 * lineWidth))
                path.line(to: NSMakePoint(endPoint.x - 1.5 * lineWidth, endPoint.y))
                path.line(to: NSMakePoint(endPoint.x,  endPoint.y - 1.5 * lineWidth))
                path.close()
                    break
            case .openArrow:
                path.move(to: NSMakePoint(endPoint.x - 3.0 * lineWidth, endPoint.y + 1.5 * lineWidth))
                path.line(to: NSMakePoint(endPoint.x,  endPoint.y))
                path.line(to: NSMakePoint(endPoint.x - 3.0 * lineWidth, endPoint.y - 1.5 * lineWidth))
                    break
            case .closedArrow:
                path.move(to: NSMakePoint(endPoint.x - 3.0 * lineWidth, endPoint.y + 1.5 * lineWidth))
                path.line(to: NSMakePoint(endPoint.x,  endPoint.y))
                path.line(to: NSMakePoint(endPoint.x - 3.0 * lineWidth, endPoint.y - 1.5 * lineWidth))
                path.close()
                    break
            @unknown default:
                fatalError()
            }
        } else if self.displayStyle == .simpleLine {
            let offset = 0.5 * lineWidth - floor(0.5 * lineWidth)
            path.move(to: NSMakePoint(NSMinX(bounds) + ceil(0.5 * NSHeight(bounds)), round(NSMidY(bounds)) - offset))
            path.line(to: NSMakePoint(NSMaxX(bounds) - ceil(0.5 * NSHeight(bounds)), round(NSMidY(bounds)) - offset))
        } else if self.displayStyle == .rectangle {
            let inset = 7.0 + 0.5 * lineWidth
            path.appendRect(NSInsetRect(bounds, inset, inset))
        } else {
            let inset = 7.0 + 0.5 * lineWidth
            path.appendOval(in: NSInsetRect(bounds, inset, inset))
        }
        
        path.lineWidth = self.lineWidth
        if self.style == .dashed {
            path.setLineDash(self.dashPattern as? [CGFloat], count: self.dashPattern?.count ?? 0, phase: 0)
        }
        return path
    }
    
    private func _activate(_ exclusive: Bool) {
        if (self.canActivate) {
            let nc = NotificationCenter.default
            let inspector = KMLineInspector.shared
            _ = inspector.window
            
            __lwFlags.existsActiveLineWell = 0
            
            nc.post(name: NSNotification.Name(rawValue: SKLineWellWillBecomeActiveNotification), object: self, userInfo: [EXCLUSIVE_KEY : NSNumber(value: exclusive)])
            
            if (__lwFlags.existsActiveLineWell != 0) {
                self.takeValue(for: SKLineWellLineWidthKey, from: inspector)
                self.takeValue(for: SKLineWellDashPatternKey, from: inspector)
                self.takeValue(for: SKLineWellStyleKey, from: inspector)
                if (self.displayStyle == .line) {
                    self.takeValue(for: SKLineWellStartLineStyleKey, from: inspector)
                    self.takeValue(for: SKLineWellEndLineStyleKey, from: inspector)
                }
            } else {
                inspector.lineWidth = self.lineWidth
                inspector.dashPattern = self.dashPattern as? [CGFloat] ?? []
                inspector.style = self.style.rawValue
                if (self.displayStyle == .line) {
                    inspector.startLineStyle = self.startLineStyle.rawValue
                    inspector.endLineStyle = self.endLineStyle.rawValue
                }
            }
            inspector.window?.orderFront(self)
            
            nc.addObserver(self, selector: #selector(_lineWellWillBecomeActive), name: NSNotification.Name(SKLineWellWillBecomeActiveNotification), object: nil)
            nc.addObserver(self, selector: #selector(_lineInspectorWindowWillClose), name: NSWindow.willCloseNotification, object: inspector.window)
            nc.addObserver(self, selector: #selector(_lineInspectorLineAttributeChanged), name: KMLineInspector.lineAttributeDidChangeNotification, object: inspector)
            
            __lwFlags.active = true
            
            self.setKeyboardFocusRingNeedsDisplay(self.bounds)
            self.needsDisplay = true
        }
    }
    
    @objc private func _lineWellWillBecomeActive(_ notification: NSNotification) {
        let sender = notification.object
        if (self.isEqual(to: sender) == false && self.isActive) {
            if let data = notification.userInfo?[EXCLUSIVE_KEY] as? NSNumber, data.boolValue {
                self._deactivate()
            } else {
                (sender as? KMLineWell)?._existsActiveLineWell()
            }
        }
    }
    
    @objc private func _lineInspectorWindowWillClose(_ notification: Notification) {
        self._deactivate()
    }
    
    @objc private func _lineInspectorLineAttributeChanged(_ notification: Notification) {
        guard let inspector = notification.object as? KMLineInspector else {
            return
        }
        let action = inspector.currentLineChangeAction
        var key: String?
        if action == .lineWidth {
            key = Self.widthKey
        } else if action == .style {
            key = Self.styleKey
        } else if action == .dashPattern {
            key = Self.dashPatternKey
        } else if action == .startLineStyle {
            key = Self.startLineStyleKey
        } else if action == .endLineStyle {
            key = Self.endLineStyleKey
        }
        
        if let _key = key {
            self.takeValue(for: _key, from: inspector)
            self.sendAction(self._pri_action, to: self._pri_target)
        }
    }
    
    private func _existsActiveLineWell() {
        __lwFlags.existsActiveLineWell = 1
    }
}