import Foundation
import Cocoa


class BackgroundView: QSBezelBackgroundView {
  
  private var glassView: NSGlassEffectView?
  private var preferencesObserver: NSObjectProtocol?
  
  override func awakeFromNib() {
    super.awakeFromNib()
    configureParentView()
    setupGlassEffect()
    observePreferenceChanges()
  }
  
  override init(frame frameRect: NSRect) {
    super.init(frame: frameRect)
    configureParentView()
    setupGlassEffect()
    observePreferenceChanges()
  }
  
  required init?(coder: NSCoder) {
    super.init(coder: coder)
    configureParentView()
    setupGlassEffect()
    observePreferenceChanges()
  }
  
  deinit {
    if let observer = preferencesObserver {
      NotificationCenter.default.removeObserver(observer)
    }
  }
  
  private func configureParentView() {
      setColor(NSColor.clear)
      setIsGlass(NSNumber(value: false))
  }
  
  private func setupGlassEffect() {
      let glassView = NSGlassEffectView(frame: bounds)
      glassView.autoresizingMask = [.width, .height]
      glassView.cornerRadius = 12.0
      
      glassView.wantsLayer = true
      glassView.layer?.masksToBounds = true
      glassView.layer?.cornerRadius = 12.0
      
      updateGlassStyle(glassView)
      updateGlassTint(glassView)

      let contentView = NSView(frame: glassView.bounds)
      contentView.autoresizingMask = [.width, .height]
      contentView.alphaValue = 0
      glassView.contentView = contentView
      
      
      addSubview(glassView, positioned: .below, relativeTo: nil)
      self.glassView = glassView
  }
  
  private func observePreferenceChanges() {
      preferencesObserver = NotificationCenter.default.addObserver(
          forName: UserDefaults.didChangeNotification,
          object: nil,
          queue: .main
      ) { [weak self] _ in
          self?.updateGlassStyleFromPreferences()
      }
  }
  
  private func updateGlassStyleFromPreferences() {
    guard let glassView = glassView else { return }
      updateGlassStyle(glassView)
      updateGlassTint(glassView)
  }
  
  private func updateGlassStyle(_ glassView: NSGlassEffectView) {
    let useGlassStyle = UserDefaults.standard.bool(forKey: "QSLiquidGlassBezelGlassStyle")
    glassView.style = useGlassStyle ? .clear : .regular
    
    glassView.cornerRadius = 12.0
    
    if !useGlassStyle {
      glassView.layer?.masksToBounds = true
      glassView.layer?.cornerRadius = 12.0
    }
  }
  
  private func updateGlassTint(_ glassView: NSGlassEffectView) {
    let shouldApplyTint = UserDefaults.standard.bool(forKey: "QSLiquidGlassBezelApplyTint")
    
    if !shouldApplyTint {
      glassView.tintColor = nil
      return
    }
    
    // QSAppearance1B -> The B I'm guessing is for Background
    // The 1 I believe is the 1st row, which is Main window.
    // My other assumptions T for text, A for Accents.
    let tintColor = UserDefaults.standard.color(forKey: "QSAppearance1B")
    
    glassView.tintColor = tintColor
  }
  
  override func viewDidMoveToWindow() {
    super.viewDidMoveToWindow()
    
    if let window = self.window {
        window.backgroundColor = NSColor.clear
        window.isOpaque = false
    }
  }
  
  override func draw(_ rect: NSRect) {
    return
  }
}