import SwiftUI

private class NSWindowAccessorView: NSView {
  let executeBlock: (_ window: NSWindow?) -> Void

  init(_ inConfigFunction: @escaping (_ window: NSWindow?) -> Void) {
    executeBlock = inConfigFunction
    super.init(frame: NSRect())
  }

  required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }

  public override func viewDidMoveToWindow() {
    super.viewDidMoveToWindow()
    executeBlock(self.window)  // We pass it through even if it is nil.
  }
}

public struct NSWindowAccessor: NSViewRepresentable {
  var configCode: (_ window: NSWindow?) -> Void

  public init(_ configCode: @escaping (_: NSWindow?) -> Void) { self.configCode = configCode }
  public func makeNSView(context: Context) -> NSView { return NSWindowAccessorView(configCode) }
  public func updateNSView(_ nsView: NSView, context: Context) {}
}