using System.Diagnostics;

namespace AgentWikiUi.Core;

record ModelOption(string Label, string Id);

static class Catalog
{
    // Da aggiornare quando escono nuovi modelli.
    public static readonly ModelOption[] Models =
    [
        new("Fable 5.1", "claude-fable-5-1"),
        new("Opus 5.5", "claude-opus-5-5"),
        new("Sonnet 5.5", "claude-sonnet-5-5"),
        new("Haiku 5.5", "claude-haiku-5-5"),
    ];

    public static readonly string[] Efforts = ["low", "medium", "high", "xhigh", "max"];
}

record RunResult(int Code, string Out, string Err);

// Unico punto di avvio di `claude`, condiviso da CLI e GUI.
static class Claude
{
    // sessionId null = nessun contesto (CLI). Model/effort vuoti = flag omessi.
    public static ProcessStartInfo CreateStart(string prompt, bool redirectOutput, string? sessionId = null, bool resume = false, string model = "", string effort = "")
    {
        var psi = new ProcessStartInfo("claude")
        {
            WorkingDirectory = AppContext.BaseDirectory, // mai la cwd del chiamante né Assembly.Location (vuoto in single-file)
            UseShellExecute = false,
            RedirectStandardInput = true, // chiuso subito dal chiamante: evita l'attesa di stdin di claude
            RedirectStandardOutput = redirectOutput,
            RedirectStandardError = redirectOutput,
            CreateNoWindow = true,
        };
        psi.ArgumentList.Add("-p");
        psi.ArgumentList.Add(prompt);
        if (sessionId is not null)
        {
            psi.ArgumentList.Add(resume ? "--resume" : "--session-id");
            psi.ArgumentList.Add(sessionId);
        }
        foreach (var (flag, value) in new[] { ("--model", model), ("--effort", effort) })
            if (value != "") { psi.ArgumentList.Add(flag); psi.ArgumentList.Add(value); }
        return psi;
    }

    // CLI: stdout/stderr ereditati (streaming), exit code propagato, 127 se `claude` manca.
    public static int RunInherited(string prompt)
    {
        try
        {
            using var p = Process.Start(CreateStart(prompt, redirectOutput: false))!;
            p.StandardInput.Close();
            p.WaitForExit();
            return p.ExitCode;
        }
        catch (System.ComponentModel.Win32Exception)
        {
            Console.Error.WriteLine("'claude' non trovato nel PATH.");
            return 127;
        }
    }

    // GUI: output catturato. Win32Exception se `claude` non è nel PATH.
    public static async Task<RunResult> RunCapturedAsync(string prompt, string sessionId, bool resume, string model, string effort)
    {
        using var p = Process.Start(CreateStart(prompt, redirectOutput: true, sessionId, resume, model, effort))!;
        p.StandardInput.Close();
        var o = p.StandardOutput.ReadToEndAsync();
        var e = p.StandardError.ReadToEndAsync();
        await p.WaitForExitAsync();
        return new(p.ExitCode, (await o).Trim(), (await e).Trim());
    }
}