//
//  KMScreenShotHandler.swift
//  PDF Reader Pro
//
//  Created by liujiajie on 2024/1/24.
//

import Foundation

let KMCancelCurrentCapturingActionNotification = "KMCancelCurrentCapturingActionNotification"

class KMScreenShotHandler: NSObject{
    var isCapturing = false
    
    static let defaultManager = KMScreenShotHandler()
    
    class func fullScreenShot() -> NSImage {
        var screenShot = CGWindowListCreateImage(.infinite, .optionOnScreenOnly, kCGNullWindowID, [])
        let img2 = NSImage(cgImage: screenShot!, size: NSZeroSize)
        screenShot = nil
        return img2
    }
    
    class func appointWindowScreenShot(withWindowID windowID: CGWindowID) -> NSImage? {
        let windowImage = CGWindowListCreateImage(.null, .optionIncludingWindow, windowID, [])
        let newImage = imageFromCGImageRef(windowImage)
        return newImage
    }
    
    class func imageFromCGImageRef(_ image: CGImage?) -> NSImage? {
        var imageRect = NSRect(x: 0.0, y: 0.0, width: 0.0, height: 0.0)
        var imageContext: CGContext?
        var newImage: NSImage?
        // Get the image dimensions.
        imageRect.size.height = CGFloat(image?.height ?? 0)
        imageRect.size.width = CGFloat(image?.width ?? 0)
        
        // Create a new image to receive the Quartz image data.
        if imageRect.size == CGSize.zero {
            return newImage
        }
        
        newImage = NSImage(size: imageRect.size)
        newImage?.lockFocus()
        
        // Get the Quartz context and draw.
        imageContext = NSGraphicsContext.current?.cgContext
        imageContext?.draw(image!, in: NSRectToCGRect(imageRect))
        
        newImage?.unlockFocus()
        return newImage
    }
    
    class func screenPosition(for event: NSEvent) -> CGPoint {
        var point = event.locationInWindow
        point.x += event.window?.frame.origin.x ?? 0
        point.y += event.window?.frame.origin.y ?? 0
        return point
    }
    
    class func calculateString(_ aString: String, font aFont: NSFont) -> CGSize {
        let attributeString = NSMutableAttributedString(string: aString)
        let style = NSMutableParagraphStyle()
        style.lineSpacing = 10
        attributeString.addAttribute(.paragraphStyle, value: style, range: NSRange(location: 0, length: aString.count))
        attributeString.addAttribute(.font, value: aFont, range: NSRange(location: 0, length: aString.count))
        let options: NSString.DrawingOptions = [.usesLineFragmentOrigin, .usesFontLeading]
        let rect = attributeString.boundingRect(with: CGSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude), options: options, context: nil)
        return CGSize(width: rect.size.width + 10, height: rect.size.height)
    }
    
    class func imageToPDFViaSavePanel(_ image: NSImage) {
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
            let savePanel = NSSavePanel()
            let originalPDFName = "untitled"
            savePanel.nameFieldStringValue = originalPDFName + "_ScreenShot"
            savePanel.allowedFileTypes = ["pdf"] 
            savePanel.begin { (result) in
                if result == .OK {
                    let newDocument = CPDFDocument()
                    _ = newDocument?.km_insert(imageData: image.jpgData() ?? Data(), pageSize: image.size, at: 0)
                    let isSuccess = newDocument?.write(to: savePanel.url!)
                    if isSuccess ?? false {
                        NSDocumentController.shared.openDocument(withContentsOf: savePanel.url!, display: true) { (document, documentWasAlreadyOpen, error) in
                            // Handle completion
                        }
                    }
                }
            }
        }
    }
    
    class func imageToPDF(_ image: NSImage) -> CPDFDocument? {
        let newDocument = CPDFDocument()
        _ = newDocument?.km_insert(imageData: image.jpgData() ?? Data(), pageSize: image.size, at: 0)
        let savePath = NSSearchPathForDirectoriesInDomains(.applicationSupportDirectory, .userDomainMask, true).last!.appending("/\(Bundle.main.bundleIdentifier!)/ScreenShot.pdf")
        let isSuccess = newDocument?.write(to: URL(fileURLWithPath: savePath))
        if isSuccess ?? false {
            return newDocument
        }
        return nil
    }
    
    class func beginScreenShot_SelectWindowCompleteHandler(_ handler: @escaping captureScreenCallBack) {
        if KMScreenShotHandler.defaultManager.isCapturing == true {
            NotificationCenter.default.post(name: Notification.Name(KMCancelCurrentCapturingActionNotification), object: nil)
        }
        let screenShotWindow = KMScreenShotMaskWindowController { (ima) in
            if let image = ima {
                handler(image)
            }
        }
        screenShotWindow.beginImageCapture(true)
    }
    class func beginScreenShot_FullSreenWithDelayTime(_ delayTime: NSInteger, completeHandler handler: @escaping captureScreenCallBack) {
        if KMScreenShotHandler.defaultManager.isCapturing {
            NotificationCenter.default.post(name: Notification.Name(KMCancelCurrentCapturingActionNotification), object: nil)
        }
        KMScreenShotHandler.defaultManager.isCapturing = true
        let screenShotWindow = KMScreenShotMaskWindowController(fullScreenShot: delayTime, completeHandler: { (ima) in
            KMScreenShotHandler.defaultManager.isCapturing = false
            if let image = ima {
                handler(image)
            }
        })
    }
    class func beginScreenshot_SelectRectWithCompleteHandler(_ handler: @escaping captureScreenCallBack) {
        if KMScreenShotHandler.defaultManager.isCapturing {
            NotificationCenter.default.post(name: Notification.Name(KMCancelCurrentCapturingActionNotification), object: nil)
        }
        let screenShotWindow = KMScreenShotMaskWindowController( handler: { (ima) in
            if let image = ima {
                handler(image)
            }
        })
        screenShotWindow.beginImageCapture(false)
    }
//    func setIsCapturing(iscapturing: Bool) {
//        self.isCapturing = iscapturing
//    }
}