using System.Net;
using AgentWikiUi.Core;

namespace AgentWikiUi.Tests;

/// <summary>Motore Antigravity (docs/TESTING.md → Antigravity, AG-01…AG-10, AG-12, UP-21).</summary>
[Trait("Category", "Unit")]
public sealed class AgyEngineTests
{
    static readonly Engine Agy = Engines.Agy;

    sealed class FakeHandler(string body) : HttpMessageHandler
    {
        public Uri? Requested;
        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken ct)
        {
            Requested = request.RequestUri;
            return Task.FromResult(new HttpResponseMessage(HttpStatusCode.OK) { Content = new StringContent(body) });
        }
    }

    [Fact] // AG-01
    public void Agy_primo_messaggio() =>
        Assert.Equal(["--output-format", "json", "--print-timeout", "120s", "-p", "ciao"],
            Agy.BuildArgs("ciao", null, resume: false, model: "", effort: "", structured: true));

    [Fact] // AG-02
    public void Agy_ripresa() =>
        Assert.Equal(["--output-format", "json", "--conversation", "conv-1", "--print-timeout", "120s", "-p", "ancora"],
            Agy.BuildArgs("ancora", "conv-1", resume: true, model: "", effort: "", structured: true));

    [Fact] // AG-03
    public void Agy_flag_prima_di_p()
    {
        var args = Agy.BuildArgs("ciao", "conv-1", true, "gemini-3.0-flash-low", "high", true);
        Assert.Equal(["-p", "ciao"], args[^2..]);
        Assert.Single(args, a => a == "-p");
    }

    [Fact] // AG-04
    public void Agy_modello_ed_effort()
    {
        var con = Agy.BuildArgs("x", null, false, "claude-opus-4-6-thinking", "max", true);
        Assert.Equal("claude-opus-4-6-thinking", con[con.IndexOf("--model") + 1]);
        Assert.Equal("max", con[con.IndexOf("--effort") + 1]);

        var senza = Agy.BuildArgs("x", null, false, "", "", true);
        Assert.DoesNotContain("--model", senza);
        Assert.DoesNotContain("--effort", senza);
    }

    [Fact] // AG-05
    public void Agy_conversation_id()
    {
        Assert.True(Agy.OwnsSessionId);
        var r = Agy.Parse(0, """{"conversation_id":"abc-123","response":"ok","status":"SUCCESS"}""", "");
        Assert.Equal("abc-123", r.SessionId);
    }

    [Fact] // AG-06
    public void Agy_estrazione_risposta()
    {
        var r = Agy.Parse(0, """{"conversation_id":"c","response":"  Ciao **mondo**\n","status":"SUCCESS"}""", "");
        Assert.Equal("Ciao **mondo**", r.Text);
        Assert.Null(r.Error);
    }

    [Fact] // AG-07
    public void Agy_errore_status()
    {
        var stato = Agy.Parse(0, """{"conversation_id":"c","response":"","status":"FAILED"}""", "");
        Assert.Equal("Stato FAILED", stato.Error);

        var campo = Agy.Parse(0, """{"conversation_id":"c","status":"SUCCESS","error":"quota esaurita"}""", "");
        Assert.Equal("quota esaurita", campo.Error);

        var uscita = Agy.Parse(2, "", "boom");
        Assert.Equal("", uscita.Text);
        Assert.Contains("agy è uscito con codice 2", uscita.Error);
        Assert.Contains("boom", uscita.Error);
    }

    [Fact] // AG-08
    public void Agy_estrazione_json_robusta()
    {
        var out_ = "Avviso: aggiornamento disponibile\n{\"conversation_id\":\"c9\",\"response\":\"risposta\",\"status\":\"SUCCESS\"}\nfine\n";
        var r = Agy.Parse(0, out_, "");
        Assert.Equal("risposta", r.Text);
        Assert.Equal("c9", r.SessionId);
        Assert.Null(r.Error);
    }

    [Fact] // AG-09
    public void Agy_nessuna_risposta()
    {
        Assert.Equal("agy non ha restituito nessuna risposta.", Agy.Parse(0, "", "").Error);
        Assert.Equal("agy non ha restituito nessuna risposta.", Agy.Parse(0, """{"conversation_id":"c","response":"  ","status":"SUCCESS"}""", "").Error);
        Assert.Equal("solo stderr", Agy.Parse(0, "non json", "solo stderr").Error);
    }

    [Fact] // AG-10
    public void Agy_cli_senza_json()
    {
        var args = Agy.BuildArgs("ciao", null, false, "", "", structured: false);
        Assert.DoesNotContain("--output-format", args);
        Assert.DoesNotContain("json", args);
        Assert.Equal(["-p", "ciao"], args[^2..]);
    }

    [Fact] // AG-12
    public void Agy_catalogo_modelli()
    {
        Assert.Equal(
            ["gemini-3.0-flash-low", "gemini-3.0-flash-medium", "gemini-3.0-flash-high",
             "claude-sonnet-4-6", "claude-opus-4-6-thinking", "gpt-oss-120b-medium"],
            Agy.Models.Select(m => m.Id));
        Assert.Equal(["low", "medium", "high", "xhigh", "max"], Agy.Efforts);
        Assert.Equal("gemini-3.0-flash-low", Agy.DefaultModelId);
        Assert.Equal("low", Agy.DefaultEffort);
        Assert.Contains(Agy.Models, m => m.Id == Agy.DefaultModelId);
        Assert.Same(Agy, Engines.Find("agy"));
    }

    [Theory] // UP-21
    [InlineData("Stable Version: 1.4.2\nBuild: abc", "1.4.2")]
    [InlineData("Stable Version: v2.0", "2.0")]
    [InlineData("1.9.9", "1.9.9")]
    public async Task Ultima_versione_agy(string body, string expected)
    {
        var handler = new FakeHandler(body);
        using var http = new HttpClient(handler);
        Assert.Equal(expected, await Agy.FetchLatestVersionAsync(http, CancellationToken.None));
        Assert.NotNull(handler.Requested);
    }

    [Fact]
    public void Comando_manuale_di_aggiornamento()
    {
        Assert.Equal("brew upgrade agy", EngineUpdater.ManualCommand(Agy, InstallMethod.Homebrew));
        Assert.Equal("agy update", EngineUpdater.ManualCommand(Agy, InstallMethod.Npm));
    }
}