import Gtk

/// A vertical container backed by `Gtk.Box(orientation: .vertical)`.
@MainActor public struct VStack: View {
    let spacing: Int32
    let content: () -> [AnyView]
    public var body: Never { fatalError() }

    /// Creates a vertical stack with the given spacing and children.
    ///
    /// - Parameters:
    ///   - spacing: Spacing between children in pixels.
    ///   - content: A ``ViewBuilder`` closure producing the children.
    public init(
        spacing: Int32 = 0,
        @ViewBuilder content: @escaping () -> [AnyView]
    ) {
        self.spacing = spacing
        self.content = content
    }
}

@_spi(Portico) extension VStack: Mountable {
    @_spi(Portico) public func mount(_ ctx: MountContext) -> Gtk.Widget {
        let box = Gtk.Box(orientation: .vertical, spacing: spacing)
        mountChildren(content, into: box, ctx) { box.appendChild($0) }
        return box
    }
}