smart_printer/smart_printer/AppDelegate.swift

//
//  AppDelegate.swift
//  smart_printer
//

import Cocoa

@main
class AppDelegate: NSObject, NSApplicationDelegate {

    private weak var mainWindowController: MainWindowController?

    func applicationWillFinishLaunching(_ notification: Notification) {
        AppSettings.applyAppearance()
    }

    func applicationDidFinishLaunching(_ notification: Notification) {
        resolveMainWindowController()
        configureMainWindow()
        configurePreferencesMenu()
        NSApp.activate(ignoringOtherApps: true)
    }

    @objc func showSettings(_ sender: Any?) {
        NSApp.activate(ignoringOtherApps: true)
        mainWindow?.makeKeyAndOrderFront(nil)
        NotificationCenter.default.post(name: .showSettings, object: nil)
    }

    private func configurePreferencesMenu() {
        guard let preferencesItem = NSApp.mainMenu?
            .item(withTitle: "smart_printer")?
            .submenu?
            .item(withTitle: "Preferences…") else { return }
        preferencesItem.target = self
        preferencesItem.action = #selector(showSettings(_:))
    }

    func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
        false
    }

    func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
        if !flag {
            resolveMainWindowController()
            mainWindowController?.showWindow(self)
            mainWindowController?.window?.makeKeyAndOrderFront(self)
            NSApp.activate(ignoringOtherApps: true)
        }
        return true
    }

    func applicationShouldRestoreApplicationState(_ app: NSApplication) -> Bool {
        false
    }

    private func configureMainWindow() {
        guard let window = mainWindow else {
            DispatchQueue.main.async { [weak self] in
                self?.configureMainWindow()
            }
            return
        }

        window.title = "Smart Printer"
        window.titlebarAppearsTransparent = true
        window.titleVisibility = .hidden
        window.styleMask.insert(.fullSizeContentView)
        window.isMovableByWindowBackground = true
        window.backgroundColor = AppTheme.background
        window.setContentSize(NSSize(width: AppTheme.windowWidth, height: AppTheme.windowHeight))
        window.minSize = NSSize(width: AppTheme.windowMinWidth, height: AppTheme.windowMinHeight)
        window.isRestorable = false
        centerWindowOnScreen(window)

        DispatchQueue.main.async {
            self.centerWindowOnScreen(window)
            window.makeKeyAndOrderFront(nil)
        }
    }

    private func centerWindowOnScreen(_ window: NSWindow) {
        let screen = NSScreen.main ?? window.screen ?? NSScreen.screens.first
        guard let visibleFrame = screen?.visibleFrame else {
            window.center()
            return
        }

        var frame = window.frame
        frame.size.width = min(frame.width, visibleFrame.width)
        frame.size.height = min(frame.height, visibleFrame.height)
        frame.origin.x = visibleFrame.midX - frame.width / 2
        frame.origin.y = visibleFrame.midY - frame.height / 2
        window.setFrame(frame, display: true)
    }

    private var mainWindow: NSWindow? {
        mainWindowController?.window
            ?? NSApplication.shared.windows.first(where: \.canBecomeMain)
    }

    private func resolveMainWindowController() {
        guard mainWindowController == nil else { return }

        mainWindowController = NSApplication.shared.windows
            .compactMap { $0.windowController as? MainWindowController }
            .first

        if mainWindowController == nil {
            DispatchQueue.main.async { [weak self] in
                self?.resolveMainWindowController()
            }
        }
    }

    func applicationSupportsSecureRestorableState(_ app: NSApplication) -> Bool {
        true
    }
}