//
//  AppSplitViewController.swift
//  Reader
//
//  Created by Shadowfacts on 1/14/22.
//

import UIKit
#if targetEnvironment(macCatalyst)
import AppKit
#endif

class AppSplitViewController: UISplitViewController {
    
    private let fervorController: FervorController
    
    private var secondaryNav: UINavigationController!
    
    init(fervorController: FervorController) {
        self.fervorController = fervorController
        
        super.init(style: .doubleColumn)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        
        preferredDisplayMode = .oneBesideSecondary
        preferredSplitBehavior = .tile
        presentsWithGesture = true
        showsSecondaryOnlyButton = true
        primaryBackgroundStyle = .sidebar
        
        let sidebarHome = HomeViewController(fervorController: fervorController)
        sidebarHome.enableStretchyMenu = false
        sidebarHome.itemsDelegate = self
        let sidebarNav = UINavigationController(rootViewController: sidebarHome)
        sidebarNav.navigationBar.prefersLargeTitles = true
        setViewController(sidebarNav, for: .primary)
        
        secondaryNav = UINavigationController()
        secondaryNav.isNavigationBarHidden = true
        secondaryNav.view.backgroundColor = .appBackground
        setViewController(secondaryNav, for: .secondary)
        
        let home = HomeViewController(fervorController: fervorController)
        let nav = AppNavigationController(rootViewController: home)
        setViewController(nav, for: .compact)
    }
    
    #if targetEnvironment(macCatalyst)
    @objc func toggleItemRead(_ item: NSToolbarItem) {
        guard let nav = viewController(for: .secondary) as? UINavigationController,
              let read = nav.topViewController as? ReadViewController else {
                  return
              }
        read.item.read = !read.item.read
        updateImage(toolbarItem: item)
    }
    
    private func updateImage(toolbarItem: NSToolbarItem) {
        if let nav = viewController(for: .secondary) as? UINavigationController,
           let read = nav.topViewController as? ReadViewController {
            toolbarItem.image = UIImage(systemName: read.item.read ? "checkmark.circle.fill" : "checkmark.circle")
        } else {
            toolbarItem.image = UIImage(systemName: "checkmark.circle")
        }
    }
    #endif

}

extension AppSplitViewController: ItemsViewControllerDelegate {
    func showReadItem(_ item: Item) {
        secondaryNav.setViewControllers([ReadViewController(item: item, fervorController: fervorController)], animated: false)
        
        #if targetEnvironment(macCatalyst)
        if let titlebar = view.window?.windowScene?.titlebar,
           let toggleRead = titlebar.toolbar?.items.first(where: { $0.itemIdentifier == .toggleItemRead }) {
            updateImage(toolbarItem: toggleRead)
        }
        #endif
    }
}

#if targetEnvironment(macCatalyst)
extension AppSplitViewController {
    override func responds(to aSelector: Selector!) -> Bool {
        if aSelector == #selector(toggleItemRead) {
            guard let nav = viewController(for: .secondary) as? UINavigationController else {
                return false
            }
            return nav.topViewController is ReadViewController
        } else {
            return super.responds(to: aSelector)
        }
    }
}
#endif