// LoopFollow
// SnoozerViewController.swift

import Combine
import SwiftUI
import UIKit

class SnoozerViewController: UIViewController {
    private var hostingController: UIHostingController<SnoozerView>?
    private var cancellables = Set<AnyCancellable>()

    @State private var snoozeMinutes = 15

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .black

        let snoozerView = SnoozerView()

        let hosting = UIHostingController(rootView: snoozerView)
        hostingController = hosting

        // Apply initial appearance
        hosting.overrideUserInterfaceStyle = Storage.shared.appearanceMode.value.userInterfaceStyle

        // Listen for appearance setting changes
        Storage.shared.appearanceMode.$value
            .receive(on: DispatchQueue.main)
            .sink { [weak self] mode in
                self?.hostingController?.overrideUserInterfaceStyle = mode.userInterfaceStyle
            }
            .store(in: &cancellables)

        // Listen for system appearance changes (when in System mode)
        NotificationCenter.default.publisher(for: .appearanceDidChange)
            .receive(on: DispatchQueue.main)
            .sink { [weak self] _ in
                self?.hostingController?.overrideUserInterfaceStyle = Storage.shared.appearanceMode.value.userInterfaceStyle
            }
            .store(in: &cancellables)

        addChild(hosting)
        view.addSubview(hosting.view)
        hosting.view.translatesAutoresizingMaskIntoConstraints = false

        NSLayoutConstraint.activate([
            hosting.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            hosting.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            hosting.view.topAnchor.constraint(equalTo: view.topAnchor),
            hosting.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        ])

        hosting.didMove(toParent: self)
    }

    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
        super.traitCollectionDidChange(previousTraitCollection)

        if Storage.shared.appearanceMode.value == .system,
           previousTraitCollection?.userInterfaceStyle != traitCollection.userInterfaceStyle
        {
            hostingController?.overrideUserInterfaceStyle = Storage.shared.appearanceMode.value.userInterfaceStyle
        }
    }
}