Program.cs

using Microsoft.AspNetCore.Components.Server;
using Plaza.Components;
using Plaza.Hubs;
using Plaza.Services;

var builder = WebApplication.CreateBuilder(args);

// Register Razor components
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();

// Configure LiteLLM Named HttpClient with endpoint suffix trimming and multi-auth headers
var baseUrl = builder.Configuration["LiteLLM:BaseUrl"] ?? "http://localhost:4000";
if (baseUrl.EndsWith("/chat/completions"))
{
    baseUrl = baseUrl.Substring(0, baseUrl.Length - "/chat/completions".Length);
}
else if (baseUrl.EndsWith("/responses"))
{
    baseUrl = baseUrl.Substring(0, baseUrl.Length - "/responses".Length);
}
if (!baseUrl.EndsWith("/"))
{
    baseUrl += "/";
}

builder.Services.AddHttpClient("litellm", client =>
{
    client.BaseAddress = new Uri(baseUrl);
    var apiKey = builder.Configuration["LiteLLM:ApiKey"];
    if (!string.IsNullOrEmpty(apiKey))
    {
        // Add headers for both Azure AI Foundry and standard OpenAI/LiteLLM compatibility
        client.DefaultRequestHeaders.Add("api-key", apiKey);
        client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", apiKey);
    }
});

// Configure custom stores and services
builder.Services.AddSingleton<IAgentStore, AgentStore>();
builder.Services.AddSingleton<IAgentSessionStore, AgentSessionStore>();
builder.Services.AddSingleton<IShareTokenStore, ShareTokenStore>();
builder.Services.AddSingleton<SessionLockManager>();
builder.Services.AddSingleton<ILiteLLMService, LiteLLMService>();
builder.Services.AddSingleton<Microsoft.Extensions.AI.IChatClient>(sp => (LiteLLMService)sp.GetRequiredService<ILiteLLMService>());
builder.Services.AddHostedService<SessionCleanupService>();

// SignalR Configuration
builder.Services.AddSignalR();

// Circuit Lifespan settings
builder.Services.Configure<CircuitOptions>(options =>
{
    options.DisconnectedCircuitRetentionPeriod = TimeSpan.FromMinutes(5);
});

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    app.UseHsts();
}

app.UseStatusCodePagesWithReExecute("/not-found", createScopeForStatusCodePages: true);
app.UseHttpsRedirection();
app.UseAntiforgery();

app.MapStaticAssets();

app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();

// Map Plaza Collaborative SignalR Hub
app.MapHub<PlazaHub>("/plazahub");

app.Run();