Tusker/Tusker/ComposeSceneDelegate.swift

//
//  ComposeSceneDelegate.swift
//  Tusker
//
//  Created by Shadowfacts on 12/12/20.
//  Copyright © 2020 Shadowfacts. All rights reserved.
//

import UIKit

class ComposeSceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?
    
    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = scene as? UIWindowScene else {
            return
        }
        
        let account: LocalData.UserAccountInfo
        let draft: Draft?
        
        if let activity = connectionOptions.userActivities.first ?? session.stateRestorationActivity,
           let activityAccount = UserActivityManager.getAccount(from: activity) {
            account = activityAccount
            draft = UserActivityManager.getDraft(from: activity)
        } else {
            account = LocalData.shared.getMostRecentAccount()!
            draft = nil
        }
        
        let controller = MastodonController.getForAccount(account)
        session.mastodonController = controller
        
        controller.getOwnAccount()
        controller.getOwnInstance()
        
        let composeVC = ComposeHostingController(draft: draft, mastodonController: controller)
        composeVC.delegate = self
        let nav = EnhancedNavigationViewController(rootViewController: composeVC)
        
        window = UIWindow(windowScene: windowScene)
        window!.rootViewController = nav
        window!.makeKeyAndVisible()
        
        NotificationCenter.default.addObserver(self, selector: #selector(themePrefChanged), name: .themePreferenceChanged, object: nil)
        themePrefChanged()
    }
    
    func sceneWillResignActive(_ scene: UIScene) {
        DraftsManager.save()
        
        if let window = window,
           let nav = window.rootViewController as? UINavigationController,
           let compose = nav.topViewController as? ComposeHostingController {
            scene.userActivity = UserActivityManager.editDraftActivity(id: compose.draft.id, accountID: scene.session.mastodonController!.accountInfo!.id)
        }
    }
    
    func stateRestorationActivity(for scene: UIScene) -> NSUserActivity? {
        return scene.userActivity
    }
    
    @objc private func themePrefChanged() {
        window?.overrideUserInterfaceStyle = Preferences.shared.theme
    }
    
}

extension ComposeSceneDelegate: ComposeHostingControllerDelegate {
    func dismissCompose(mode: ComposeUIState.DismissMode) -> Bool {
        let animation: UIWindowScene.DismissalAnimation
        switch mode {
        case .cancel:
            animation = .decline
        case .post:
            animation = .commit
        }
        closeWindow(animation: animation)
        return true
    }
}