//
//  NSWindow+KMExtension.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2023/10/30.
//

import Foundation

private var _KMWindowPopOverKey = "KMWindowPopOverKey"
private var _KMWindowPopOverSourcesRectKey = "KMWindowPopOverSourcesRectKey"
extension NSWindow {
    var popover: NSPopover? {
        get {
            return objc_getAssociatedObject(self, &_KMWindowPopOverKey) as? NSPopover
        }
        set {
            objc_setAssociatedObject(self, &_KMWindowPopOverKey, newValue, .OBJC_ASSOCIATION_RETAIN)
        }
    }
    
    var sourcesRect: NSRect {
        get {
            if let data = objc_getAssociatedObject(self, &_KMWindowPopOverSourcesRectKey) as? NSValue {
                return data.rectValue
            }
            return NSZeroRect
        }
        set {
            objc_setAssociatedObject(self, &_KMWindowPopOverSourcesRectKey, NSValue(rect: newValue), .OBJC_ASSOCIATION_RETAIN)
        }
    }
    
    open override func mouseMoved(with event: NSEvent) {
        super.mouseMoved(with: event)
        
        let point = event.locationInWindow
        var need = true
        if let data = event.window?.isKind(of: NSClassFromString("_NSPopoverWindow")!) {
//            need = !data
            if data {
                need = false
            } else {
                need = true
            }
        } else {
            need = true
        }
        if (need) {
            if (self.sourcesRect.contains(point) == false) {
                if self.popover != nil {
                    NotificationCenter.default.post(name: Notification.Name("KMPopOverClosedByWindowNotification"), object: self.popover!)
                    self.popover?.close()
                    self.popover = nil
                    self.sourcesRect = NSRect.null
                }
            }
        }
    }
}

extension NSWindow {
    static func currentWindow() -> NSWindow {
        var window = NSApp.mainWindow
        if NSApp.mainWindow?.sheets.first != nil {
            window = NSApp.mainWindow?.sheets.first
        }
        if window == nil {
            window = NSApplication.shared.windows.first
        }
        return window ?? NSWindow()
    }
}

@objc extension NSWindow {
    public static let willEnterInteractionModeNotification: NSNotification.Name = .init("KMWillEnterInteractionModeNotificationName")
    public static let didEnterInteractionModeNotification: NSNotification.Name = .init("KMDidEnterInteractionModeNotificationName")
    
    public static let willShowFullScreenNotification: NSNotification.Name = .init("KMWillShowFullScreenNotificationName")
    public static let didShowFullScreenNotification: NSNotification.Name = .init("KMDidShowFullScreenNotificationName")
    
    public static let didAddContentViewNotification: NSNotification.Name = .init("KMDidAddContentViewNotificationName")
    
    struct UserInfo {
        public static let interactionModeKey = "KMInteractionModeKey"
        public static let isSwitchingFullScreenKey = "KMIsSwitchingFullScreenKey"
        public static let wantsPresentationKey = "KMWantsPresentationKey"
    }
    
    private static var interactionModeKey_ = "KMInteractionModeKey"
    var interactionMode: KMInteractionMode {
        get {
            if let win = self.interactionParent { // 从 interactionParent 获取数据
                return win.interactionMode
            }
            if let value = (objc_getAssociatedObject(self, &Self.interactionModeKey_) as? Int) {
                return KMInteractionMode(rawValue: value) ?? .normal
            }
            return .normal
        }
        set {
            objc_setAssociatedObject(self, &Self.interactionModeKey_, newValue.rawValue, .OBJC_ASSOCIATION_ASSIGN)
            
            // interactionParent 设置数据
            self.interactionParent?.interactionMode = newValue
        }
    }
    
    private static var isSwitchingFullScreenKey_ = "KMIsSwitchingFullScreenKey"
    var isSwitchingFullScreen: Bool {
        get {
            if let win = self.interactionParent { // 从 interactionParent 获取数据
                return win.isSwitchingFullScreen
            }
            return (objc_getAssociatedObject(self, &Self.isSwitchingFullScreenKey_) as? Bool) ?? false
        }
        set {
            objc_setAssociatedObject(self, &Self.isSwitchingFullScreenKey_, newValue, .OBJC_ASSOCIATION_ASSIGN)
            
            // interactionParent 设置数据
            self.interactionParent?.isSwitchingFullScreen = newValue
        }
    }
    
    private static var wantsPresentationKey_ = "KMWantsPresentationKey"
    var wantsPresentation: Bool {
        get {
            if let win = self.interactionParent { // 从 interactionParent 获取数据
                return win.wantsPresentation
            }
            return (objc_getAssociatedObject(self, &Self.wantsPresentationKey_) as? Bool) ?? false
        }
        set {
            objc_setAssociatedObject(self, &Self.wantsPresentationKey_, newValue, .OBJC_ASSOCIATION_ASSIGN)
            
            // interactionParent 设置数据
            self.interactionParent?.wantsPresentation = newValue
        }
    }
    
    // sheetParent
    private static var interactionParentKey_ = "KMInteractionParentKey"
    var interactionParent: NSWindow? {
        get {
            return (objc_getAssociatedObject(self, &Self.interactionParentKey_) as? NSWindow)
        }
        set {
            objc_setAssociatedObject(self, &Self.interactionParentKey_, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
            
            // 更新数据
            self.interactionMode = self.interactionParent?.interactionMode ?? .normal
            self.isSwitchingFullScreen = self.interactionParent?.isSwitchingFullScreen ?? false
            self.wantsPresentation = self.interactionParent?.wantsPresentation ?? false
        }
    }
    
    func canEnterPresentation() -> Bool {
        if self.interactionMode == .presentation { // 幻灯片模式下
            return false
        }
        if self.isSwitchingFullScreen { // 正在切换中
            return false
        }
        
        let cnt = self.tabbedWindows?.count ?? 0
        return cnt < 2
    }
    
    func canExitPresentation() -> Bool {
        if self.isSwitchingFullScreen { // 正在切换中
            return false
        }
        if self.interactionMode == .presentation { // 幻灯片模式下
            return true
        }
        return false
    }
    
    func enterPresentation(provider: KMInteractionProviderProtocol? = nil) {
        if self.canEnterPresentation() == false {
            NSSound.beep()
            return
        }
        
        let wasInteractionMode = self.interactionMode
        if wasInteractionMode == .fullScreen { // 是全屏模式，直接退出全屏模式
            self.wantsPresentation = true
            self.toggleFullScreen(nil)
            return
        }
        
        let backgroundColor = NSColor.black
        let level = UserDefaults.standard.bool(forKey: "SKUseNormalLevelForPresentationKey") ? NSWindow.Level.normal : NSWindow.Level.popUpMenu
        
        NotificationCenter.default.post(name: Self.willEnterInteractionModeNotification, object: self, userInfo: [Self.UserInfo.interactionModeKey : KMInteractionMode.presentation])
        
        // 设置切换中标识
        self.isSwitchingFullScreen = true
        // 设置模式标识
        self.interactionMode = .presentation
        if wasInteractionMode == .legacyFullScreen {

        } else {
            NotificationCenter.default.post(name: Self.willShowFullScreenNotification, object: self, userInfo: ["fullScreenWindow" : ""])
            let fsWindow = self.fadeInFullScreenWindow(with: backgroundColor, level: level.rawValue)
            NotificationCenter.default.post(name: Self.didShowFullScreenNotification, object: self, userInfo: ["fullScreenWindow" : ""])
            
            let view = provider?.providerContentView?(fullScreenWindow: fsWindow, inset: 0)
            self.fadeInFullScreenView(fullScreenWindow: fsWindow, with: view, inset: 0)
        }
        // 恢复切换全屏标识
        self.isSwitchingFullScreen = false
        NotificationCenter.default.post(name: Self.didEnterInteractionModeNotification, object: self, userInfo: ["fullScreenWindow" : ""])
    }
    
    func exitFullscreen() {
        
    }
    
    // MARK: - fadeIn & fadeOut [淡入、淡出]
    func fadeInFullScreenWindow(with backgroundColor: NSColor, level: Int) -> KMFullScreenWindow {
        let fullScreenWindow = KMFullScreenWindow(screen: (self.screen ?? NSScreen.main)!, bgColor: backgroundColor, level: NSWindow.Level.popUpMenu.rawValue, isMain: true)
        fullScreenWindow.interactionParent = self
        
        self.delegate = nil
        fullScreenWindow.fadeInBlocking()
        self.windowController?.window = fullScreenWindow
        fullScreenWindow.makeKey()
                
        let sel = NSSelectorFromString("setAnimationBehavior:")
        if self.responds(to: sel){
            self.animationBehavior = .none
        }
        self.orderOut(nil)
        if self.responds(to: sel) {
            self.animationBehavior = .default
        }
        fullScreenWindow.level = NSWindow.Level(rawValue: level)
        fullScreenWindow.orderFront(nil)
        
        return fullScreenWindow
    }
    
    func fadeInFullScreenView(fullScreenWindow: KMFullScreenWindow, with view: NSView?, inset: CGFloat) {
        let fadeWindow = KMFullScreenWindow(screen: fullScreenWindow.screen!, bgColor: fullScreenWindow.backgroundColor, level: fullScreenWindow.level.rawValue, isMain: false)

        fadeWindow.order(.above, relativeTo: fullScreenWindow.windowNumber)
        if let _ = view {
            NotificationCenter.default.post(name: Self.didAddContentViewNotification, object: self)
        }
        fullScreenWindow.makeFirstResponder(view)
        fullScreenWindow.recalculateKeyViewLoop()
        fullScreenWindow.delegate = (fullScreenWindow.windowController as? any NSWindowDelegate)
        fullScreenWindow.display()
        fadeWindow.fadeOut()
    }
}