#if os(macOS)
import SwiftUI

/// One quiet line about a quiet updater's pending update, for an app's home screen.
/// Empty when nothing is pending or while the app is busy, so it can sit in a layout
/// permanently. Place it where a person rests, never over work in progress.
public struct NativeUpdateNotice: View {
    private let updater: NativeUpdater

    public init(updater: NativeUpdater) { self.updater = updater }

    public var body: some View {
        if updater.canInstallPendingUpdate {
            HStack(alignment: .firstTextBaseline, spacing: 8) {
                Label { message } icon: { Image(systemName: "arrow.down.circle") }
                    .foregroundStyle(.secondary)
                Button(action: updater.installPendingUpdate) { action }
                    .buttonStyle(.borderless)
            }
            .font(.callout)
            .accessibilityElement(children: .contain)
        }
    }

    private var app: String { NativeUpdateCommands.appName }

    private var message: Text {
        switch updater.pendingUpdate {
        case .ready(let version): Text("\(app) \(version) is ready.", bundle: NativeUpdateCommands.resources)
        case .available(let version): Text("\(app) \(version) is available.", bundle: NativeUpdateCommands.resources)
        case .none: Text(verbatim: "")
        }
    }

    private var action: Text {
        if case .ready = updater.pendingUpdate {
            return Text("Restart to Update", bundle: NativeUpdateCommands.resources)
        }
        return Text("Update…", bundle: NativeUpdateCommands.resources)
    }
}
#endif