import SwiftUI

struct MobileToolbarLayout: Equatable {
    var isTopBar = false
    var verticalEdge: HorizontalEdge?

    var isVertical: Bool { verticalEdge != nil }
    var usesIconSwitcher: Bool { isTopBar || isVertical }
    var showsWorkspaceTabs: Bool { isTopBar || isVertical }
}

extension EnvironmentValues {
    @Entry var mobileToolbarLayout = MobileToolbarLayout()
}

/// Read inside a Tab's content, outside the detail's visibility preferences.
private struct MobileToolbarEnvironment: ViewModifier {
    @Environment(\.tabBarPlacement) private var placement

    func body(content: Content) -> some View {
        #if TERMIND_HAS_IOS_27_1_SDK
            if #available(iOS 27.1, *) {
                content.modifier(MobileVerticalToolbarEnvironment(isTopBar: placement == .topBar))
            } else {
                content.environment(
                    \.mobileToolbarLayout,
                    MobileToolbarLayout(isTopBar: placement == .topBar))
            }
        #else
            content.environment(
                \.mobileToolbarLayout,
                MobileToolbarLayout(isTopBar: placement == .topBar))
        #endif
    }
}

#if TERMIND_HAS_IOS_27_1_SDK
    @available(iOS 27.1, *)
    private struct MobileVerticalToolbarEnvironment: ViewModifier {
        let isTopBar: Bool
        @Environment(\.toolbarVerticalEdge) private var edge

        func body(content: Content) -> some View {
            content.environment(
                \.mobileToolbarLayout,
                MobileToolbarLayout(isTopBar: isTopBar, verticalEdge: edge))
        }
    }
#endif

extension View {
    func mobileToolbarEnvironment() -> some View {
        modifier(MobileToolbarEnvironment())
    }
}