// Apple-only learning file: iOS 17+ target with a suitable Xcode SDK.
// Not compiled or run in this Windows/Linux review.
import SwiftUI
import Observation

@Observable @MainActor final class WorkshopModel {
    private let capacity = 6
    private(set) var booked = 0
    private(set) var notice = "No request yet"
    var free: Int { capacity - booked }
    func request(_ amount: Int) {
        guard amount > 0, amount <= free else { notice = "Request refused; state unchanged"; return }
        booked += amount
        notice = "Accepted by this local model only"
    }
}

struct DemoView: View {
    @State private var model = WorkshopModel()
    var body: some View {
        VStack(spacing: 20) {
            Text("Places remaining: \(model.free)").font(.title)
            Button("Request two places") { model.request(2) }
            Text(model.notice)
            Text("In-memory teaching model only.").font(.caption)
        }.padding()
    }
}

@main
struct WorkshopDemoApp: App {
    var body: some Scene { WindowGroup { DemoView() } }
}