using Microsoft.AspNetCore.Diagnostics.HealthChecks;
using Microsoft.Extensions.Diagnostics.HealthChecks;
var builder = WebApplication.CreateBuilder(args);
if (!builder.Environment.IsDevelopment()) throw new InvalidOperationException("The manual readiness control is development-only");
builder.Services.AddSingleton<ReadyState>(); builder.Services.AddHealthChecks().AddCheck<ReadyCheck>("classroom-state", tags: new[] { "ready" });
var app = builder.Build();
app.MapHealthChecks("/health/live", new HealthCheckOptions { Predicate = _ => false });
app.MapHealthChecks("/health/ready", new HealthCheckOptions { Predicate = registration => registration.Tags.Contains("ready") });
app.MapPost("/lab/ready", (ReadyState state) => { state.Ready = true; return TypedResults.NoContent(); }); app.Run();
public sealed class ReadyState { private int ready; public bool Ready { get => Volatile.Read(ref ready) == 1; set => Volatile.Write(ref ready, value ? 1 : 0); } }
public sealed class ReadyCheck(ReadyState state) : IHealthCheck {
    public Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken token = default) {
        token.ThrowIfCancellationRequested(); return Task.FromResult(state.Ready ? HealthCheckResult.Healthy("Classroom switch is ready") : HealthCheckResult.Unhealthy("Classroom switch is not ready"));
    }
}