//
//  Submenu.swift
//  Adwaita
//
//  Created by david-swift on 22.10.23.
//

import CAdw

/// A submenu widget.
public struct Submenu: MenuWidget {

    /// The label of the submenu.
    var label: String
    /// The content of the submenu.
    var content: Body

    /// Initialize a submenu.
    /// - Parameters:
    ///     - label: The submenu's label.
    ///     - content: The content of the section.
    public init(_ label: String, @ViewBuilder content: () -> Body) {
        self.label = label
        self.content = content()
    }

    /// The view storage.
    /// - Parameters:
    ///     - modifiers: Modify the views before updating.
    ///     - type: The type of the views.
    /// - Returns: The view storage.
    public func container<Data>(
        modifiers: [(any AnyView) -> any AnyView],
        type: Data.Type
    ) -> ViewStorage where Data: ViewRenderData {
        let storage = ViewStorage(nil)
        let getItem: (AdwaitaApp, AdwaitaWindow?) -> OpaquePointer? = { app, window in
            let childStorage = MenuCollection { content }.getMenu(app: app, window: window)
            storage.content[.mainContent] = [childStorage]
            return g_menu_item_new_submenu(label, childStorage.opaquePointer?.cast())
        }
        storage.pointer = getItem
        return storage
    }

    /// Update the stored content.
    /// - Parameters:
    ///     - storage: The storage to update.
    ///     - modifiers: Modify the views before updating.
    ///     - updateProperties: Whether to update the properties.
    ///     - type: The type of the views.
    public func update<Data>(
        _ storage: ViewStorage,
        modifiers: [(AnyView) -> AnyView],
        updateProperties: Bool,
        type: Data.Type
    ) where Data: ViewRenderData {
        guard let content = storage.content[.mainContent]?.first else {
            return
        }
        MenuCollection { self.content }
            .updateStorage(content, modifiers: [], updateProperties: updateProperties, type: MenuContext.self)
    }

}