app_for_indeed/App for Indeed/Controllers/LoadingViewController.swift

//
//  LoadingViewController.swift
//  App for Indeed
//

import Cocoa

final class LoadingViewController: NSViewController {
    private let loadingView = LoadingView(frame: .zero)
    private var didStartLaunch = false
    private var didTransitionToDashboard = false

    override func loadView() {
        view = loadingView
    }

    override func viewDidAppear() {
        super.viewDidAppear()
        guard !didStartLaunch else { return }
        didStartLaunch = true

        if let window = view.window {
            AppWindowConfiguration.apply(to: window)
        }

        Task { @MainActor in
            await runLaunchSequence()
            transitionToDashboard()
        }
    }

    @MainActor
    private func runLaunchSequence() async {
        loadingView.setStatus(L("Starting up…"), progress: 0.05)

        async let startup: Void = AppLaunchCoordinator.performStartup { [weak self] message, progress in
            self?.loadingView.setStatus(message, progress: progress)
        }
        async let minimumDisplay: Void = {
            try? await Task.sleep(nanoseconds: AppLaunchCoordinator.minimumDisplayNanoseconds)
        }()
        _ = await (startup, minimumDisplay)
    }

    @MainActor
    private func transitionToDashboard() {
        guard !didTransitionToDashboard, let window = view.window else { return }
        didTransitionToDashboard = true
        loadingView.stopAnimating()

        let dashboard = ViewController()
        NSAnimationContext.runAnimationGroup { context in
            context.duration = 0.32
            context.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
            window.animator().contentViewController = dashboard
        } completionHandler: { [weak window] in
            guard let window else { return }
            AppWindowConfiguration.apply(to: window)
            window.center()
        }
    }
}