import Foundation

final class NavigationSettings: ObservableObject {

    /// The items to show in the navigation bar
    @Published
    var navigationItems: [Item]

    @Published
    var german: LocalizedNavigationSettings

    @Published
    var english: LocalizedNavigationSettings

    init(navigationItems: [Item], german: LocalizedNavigationSettings, english: LocalizedNavigationSettings) {
        self.navigationItems = navigationItems
        self.german = german
        self.english = english
    }

    init(file: NavigationSettingsFile,
         tags: [String : Tag],
         pages: [String : Page],
         files: [String : FileResource],
         posts: [String : Post],
         tagOverview: TagOverviewPage?) {
        
        #warning("Notify about missing links")
        self.navigationItems = file.navigationItems.compactMap { raw in
            guard let type = ItemType(rawValue: raw, posts: posts, pages: pages, tags: tags) else {
                return nil
            }
            switch type {
            case .general:
                return nil
            case .post(let post):
                return post
            case .feed:
                return nil // TODO: Provide feed object
            case .page(let page):
                return page
            case .tagPage(let tag):
                return tag
            case .tagOverview:
                return tagOverview
            }
        }
        self.german = LocalizedNavigationSettings(file: file.german)
        self.english = LocalizedNavigationSettings(file: file.english)
    }

    var file: NavigationSettingsFile {
        .init(
            navigationItems: navigationItems.map { $0.itemType.id },
            german: german.file,
            english: english.file)
    }
}

extension NavigationSettings: LocalizedItem {
    
}

extension NavigationSettings {

    static var `default`: NavigationSettings {
        .init(navigationItems: [],
              german: .default,
              english: .default)
    }
}