refactor: apply Single Responsibility Principle to Program.cs and ReplLoop.cs

extracted responsibilities from Program.cs (208→46 lines) and ReplLoop.cs (274→174 lines) into focused service classes: HeaderRenderer, SessionManager, ApplicationStartup, ResponseStreamer, SpinnerService, UsageDisplayer, and ContextCompactionService. Each class now has a single, well-defined responsibility, improving testability and maintainability.

Program.cs

@@ -1,208 +1,45 @@
-using System.ClientModel;
-using System.Reflection;
-using AnchorCli.Providers;
-using Microsoft.Extensions.AI;
-using OpenAI;
 using AnchorCli;
-using AnchorCli.Tools;
 using AnchorCli.Commands;
-using AnchorCli.OpenRouter;
 using Spectre.Console;
 
 Console.InputEncoding = System.Text.Encoding.UTF8;
 Console.OutputEncoding = System.Text.Encoding.UTF8;
 
-// ── Setup subcommand ─────────────────────────────────────────────────────
-if (args.Length > 0 && args[0].Equals("setup", StringComparison.OrdinalIgnoreCase))
+// ── Application entry point ───────────────────────────────────────────────
+var startup = new ApplicationStartup(args);
+
+// Handle setup subcommand
+if (startup.HandleSetupSubcommand())
 {
-    SetupTui.Run();
     return;
 }
 
-// ── Config ──────────────────────────────────────────────────────────────
-var cfg = AnchorConfig.Load();
-string apiKey = cfg.ApiKey;
-string model = cfg.Model;
-string provider = cfg.Provider ?? "openrouter";
-string endpoint = cfg.Endpoint ?? "https://openrouter.ai/api/v1";
+// Initialize application (load config, create clients, fetch pricing)
+await startup.InitializeAsync();
 
-if (string.IsNullOrWhiteSpace(apiKey))
-{
-    AnsiConsole.MarkupLine("[red]No API key configured. Run [bold]anchor setup[/] first.[/]");
-    return;
-}
+// Render header
+var headerRenderer = startup.CreateHeaderRenderer();
+headerRenderer.Render();
 
-// ── Create token extractor for this provider ───────────────────────────
-var tokenExtractor = ProviderFactory.CreateTokenExtractorForEndpoint(endpoint);
-
-// ── Fetch model pricing (only for supported providers) ─────────────────
-ModelInfo? modelInfo = null;
-TokenTracker? tokenTracker = null;
-if (ProviderFactory.IsOpenRouter(endpoint))
-{
-    await AnsiConsole.Status()
-        .Spinner(Spinner.Known.BouncingBar)
-        .SpinnerStyle(Style.Parse("cornflowerblue"))
-        .StartAsync("Fetching model pricing...", async ctx =>
-        {
-            try
-            {
-                var pricingProvider = new OpenRouterProvider();
-                modelInfo = await pricingProvider.GetModelInfoAsync(model);
-            }
-            catch { /* pricing is best-effort */ }
-        });
-}
-
-
-// ── Pretty header ───────────────────────────────────────────────────────
-var fontStream = Assembly.GetExecutingAssembly().GetManifestResourceStream("AnchorCli.Assets.3d.flf");
-if (fontStream != null)
-{
-    var font = FigletFont.Load(fontStream);
-    AnsiConsole.Write(
-        new FigletText(font, "anchor")
-            .Color(Color.CornflowerBlue));
-}
-else
-{
-    AnsiConsole.Write(
-        new FigletText("anchor")
-            .Color(Color.CornflowerBlue));
-}
-
-
-var version = Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "unknown";
-
-// ── Pretty header ───────────────────────────────────────────────────────
-
-AnsiConsole.Write(
-    new Rule("[dim]AI-powered coding assistant[/]")
-        .RuleStyle(Style.Parse("cornflowerblue dim"))
-        .LeftJustified());
-
-AnsiConsole.WriteLine();
-
-var infoTable = new Table()
-    .Border(TableBorder.Rounded)
-    .BorderColor(Color.Grey)
-    .AddColumn(new TableColumn("[dim]Setting[/]").NoWrap())
-    .AddColumn(new TableColumn("[dim]Value[/]"));
-
-infoTable.AddRow("[grey]Model[/]", $"[cyan]{Markup.Escape(modelInfo?.Name ?? model)}[/]");
-infoTable.AddRow("[grey]Provider[/]", $"[blue]{tokenExtractor.ProviderName}[/]");
-infoTable.AddRow("[grey]Endpoint[/]", $"[dim]{endpoint}[/]");
-infoTable.AddRow("[grey]Version[/]", $"[magenta]{version}[/]");
-
-if (modelInfo?.Pricing != null && tokenTracker != null)
-
-{
-    var inM = tokenTracker.InputPrice * 1_000_000m;
-    var outM = tokenTracker.OutputPrice * 1_000_000m;
-    infoTable.AddRow("[grey]Pricing[/]",
-        $"[yellow]${inM:F2}[/][dim]/M in[/]  [yellow]${outM:F2}[/][dim]/M out[/]");
-}
-if (modelInfo != null)
-{
-    infoTable.AddRow("[grey]Context[/]",
-        $"[dim]{modelInfo.ContextLength:N0} tokens[/]");
-}
-
-AnsiConsole.Write(infoTable);
-AnsiConsole.WriteLine();
-
-// ── Build the chat client with tool-calling support ─────────────────────
-var httpClient = new HttpClient();
-OpenRouterHeaders.ApplyTo(httpClient);
-
-var openAiClient = new OpenAIClient(new ApiKeyCredential(apiKey), new OpenAIClientOptions
-{
-    Endpoint = new Uri(endpoint),
-    Transport = new System.ClientModel.Primitives.HttpClientPipelineTransport(httpClient)
-});
-
-IChatClient innerClient = openAiClient.GetChatClient(model).AsIChatClient();
-
-// ── Tool call logging via Spectre ───────────────────────────────────────
-object consoleLock = new();
-
-void ToolLog(string message)
-{
-    lock (consoleLock)
-    {
-        Console.Write("\r" + new string(' ', 40) + "\r");
-        AnsiConsole.MarkupLine($"[dim grey]{Markup.Escape(message)}[/]");
-    }
-}
-
-CommandTool.Log =
-DirTools.Log =
-FileTools.Log =
-EditTools.Log = ToolLog;
-
-// ── Instantiate Core Components ──────────────────────────────────────────
-
-var session = new ChatSession(innerClient);
-tokenTracker = new TokenTracker(session) { Provider = tokenExtractor.ProviderName };
-if (modelInfo != null)
-{
-    if (modelInfo.Pricing != null)
-    {
-        tokenTracker.InputPrice = PricingProvider.ParsePrice(modelInfo.Pricing.Prompt);
-        tokenTracker.OutputPrice = PricingProvider.ParsePrice(modelInfo.Pricing.Completion);
-        tokenTracker.RequestPrice = PricingProvider.ParsePrice(modelInfo.Pricing.Request);
-    }
-    tokenTracker.ContextLength = modelInfo.ContextLength;
-}
-
-var commandRegistry = new CommandRegistry();
-commandRegistry.Register(new ExitCommand());
-commandRegistry.Register(new HelpCommand(commandRegistry));
-commandRegistry.Register(new ClearCommand());
-commandRegistry.Register(new StatusCommand(model, endpoint));
-commandRegistry.Register(new CompactCommand(session.Compactor, session.History));
-commandRegistry.Register(new SetupCommand());
-commandRegistry.Register(new ResetCommand(session, tokenTracker));
+// Configure tool logging
+startup.ConfigureToolLogging();
 
+// Create core components
+var session = startup.CreateSession();
+startup.TokenTracker.Session = session;
 
+var commandRegistry = startup.CreateCommandRegistry(session);
 var commandDispatcher = new CommandDispatcher(commandRegistry);
 
-// ── Run Repl ────────────────────────────────────────────────────────────
+// Create session manager
+var sessionManager = new SessionManager(session);
 
 // Auto-load session if it exists
-const string sessionPath = ".anchor/session.json";
-if (File.Exists(sessionPath))
-{
-    try
-    {
-        await session.LoadAsync(sessionPath, default);
-        AnsiConsole.MarkupLine($"[dim grey]Auto-loaded previous session.[/]");
+await sessionManager.TryLoadAsync();
 
-        // Print the last message if there is one
-        if (session.History.Count > 1)
-        {
-            var lastMessage = session.History[^1];
-            var preview = lastMessage.Text.Length > 280
-                ? lastMessage.Text[..277] + "..."
-                : lastMessage.Text;
-            AnsiConsole.MarkupLine($"[dim grey]  Last message: {Markup.Escape(preview)}[/]");
-        }
-    }
-    catch { /* Ignore load errors on startup */ }
-}
-
-var repl = new ReplLoop(session, tokenTracker, commandDispatcher);
+// Run REPL loop
+var repl = new ReplLoop(session, startup.TokenTracker, commandDispatcher, sessionManager);
 await repl.RunAsync();
 
 // Auto-save session on clean exit
-try
-{
-    var directory = Path.GetDirectoryName(sessionPath);
-    if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
-    {
-        Directory.CreateDirectory(directory);
-    }
-    await session.SaveAsync(sessionPath, default);
-}
-catch { /* Ignore save errors on exit */ }
-
+await sessionManager.TrySaveAsync();