using System.Diagnostics;
using System.Windows.Forms;

if (args.Length == 0)
{
    ApplicationConfiguration.Initialize();
    Application.Run(new Gui());
    return 0;
}

var psi = NewClaude(string.Join(' ', args));
try
{
    using var p = Process.Start(psi)!; // stdout/stderr ereditati: streaming in tempo reale
    p.StandardInput.Close();
    p.WaitForExit();
    return p.ExitCode;
}
catch (System.ComponentModel.Win32Exception)
{
    Console.Error.WriteLine("'claude' non trovato nel PATH.");
    return 127;
}

static ProcessStartInfo NewClaude(string prompt)
{
    var psi = new ProcessStartInfo("claude")
    {
        WorkingDirectory = AppContext.BaseDirectory,
        UseShellExecute = false,
        RedirectStandardInput = true, // evita l'attesa di stdin di claude
    };
    psi.ArgumentList.Add("-p");
    psi.ArgumentList.Add(prompt);
    return psi;
}

class Gui : Form
{
    readonly TextBox prompt = new() { Dock = DockStyle.Top, Multiline = true, Height = 80, AcceptsReturn = true };
    readonly Button send = new() { Dock = DockStyle.Top, Text = "Invia a Claude", Height = 32 };
    readonly TextBox output = new() { Dock = DockStyle.Fill, Multiline = true, ReadOnly = true, ScrollBars = ScrollBars.Vertical };

    public Gui()
    {
        Text = "LlmRun";
        Width = 700; Height = 500;
        Controls.Add(output); Controls.Add(send); Controls.Add(prompt); // Fill per primo: l'ordine inverso dei Dock
        send.Click += async (_, _) => await Run();
    }

    async Task Run()
    {
        if (string.IsNullOrWhiteSpace(prompt.Text)) return;
        send.Enabled = false;
        output.Clear();
        try
        {
            var psi = Program_NewClaude(prompt.Text);
            using var p = Process.Start(psi)!;
            p.StandardInput.Close();
            void Append(string? l) { if (l != null) BeginInvoke(() => output.AppendText(l + Environment.NewLine)); }
            p.OutputDataReceived += (_, e) => Append(e.Data);
            p.ErrorDataReceived += (_, e) => Append(e.Data);
            p.BeginOutputReadLine(); p.BeginErrorReadLine();
            await p.WaitForExitAsync();
            output.AppendText($"[exit {p.ExitCode}]");
        }
        catch (System.ComponentModel.Win32Exception) { output.Text = "'claude' non trovato nel PATH."; }
        finally { send.Enabled = true; }
    }

    static ProcessStartInfo Program_NewClaude(string prompt)
    {
        var psi = new ProcessStartInfo("claude")
        {
            WorkingDirectory = AppContext.BaseDirectory,
            UseShellExecute = false,
            RedirectStandardInput = true, RedirectStandardOutput = true, RedirectStandardError = true,
            CreateNoWindow = true,
        };
        psi.ArgumentList.Add("-p");
        psi.ArgumentList.Add(prompt);
        return psi;
    }
}