//
//  MenuBar.swift
//  TermKitBackend
//
//  Created by david-swift on 01.07.2024.
//

import TermKit

/// The menu bar scene element adds a menu bar to the top of the app.
struct MenuBar: TermKitSceneElement {

    /// The identifier of the menu bar.
    var id: String
    /// The menu bar's content.
    var content: Body

    /// Initialize the menu bar.
    /// - Parameters:
    ///     - id: The identifier of the menu bar.
    ///     - content: The menu bar's content.
    init(id: String = "main-menu", @ViewBuilder content: () -> Body) {
        self.id = id
        self.content = content()
    }

    /// Set up the initial scene storages.
    /// - Parameter app: The app storage.
    func setupInitialContainers<Storage>(app: Storage) where Storage: AppStorage {
        app.storage.sceneStorage.append(container(app: app))
    }

    /// The scene storage.
    /// - Parameter app: The app storage.
    func container<Storage>(app: Storage) -> SceneStorage where Storage: AppStorage {
        let storage = SceneStorage(id: id, pointer: nil) { }
        let items = MenuCollection { content }.container(
            data: .init(sceneStorage: storage, appStorage: app),
            type: MenuContext.self
        )
        let menubar = TermKit.MenuBar(
            menus: items.pointer as? [TermKit.MenuBarItem] ?? []
        )
        for element in Application.top.subviews {
            element.y = .bottom(of: menubar)
        }
        Application.top.addSubview(menubar)
        storage.pointer = menubar
        storage.show = {
            menubar.ensureFocus()
        }
        return storage
    }

    /// Update the stored content.
    /// - Parameters:
    ///     - storage: The storage to update.
    ///     - app: The app storage.
    ///     - updateProperties: Whether to update the view's properties.
    func update<Storage>(
        _ storage: SceneStorage,
        app: Storage,
        updateProperties: Bool
    ) where Storage: AppStorage {
        Application.refresh()
    }

}