using System.Text.Json;
using ClawdDotNet.App.Services;
using ClawdDotNet.Core.Staging;
using Shouldly;

namespace ClawdDotNet.App.Tests.Services;

/// <summary>
/// #764: Tool settings written from the WebUI — the desktop ToolSettingsView, without a
/// window. The secrets go one way, and nothing the form does not touch may change.
/// </summary>
public sealed class ToolSettingsFormTests
{
    /// <summary>Settings as they are after loading: values as JsonElement, as from the file.</summary>
    private static Dictionary<string, object?> Loaded(string json)
        => JsonSerializer.Deserialize<Dictionary<string, object?>>(json)!;

    [Fact]
    public void The_form_shows_no_secret()
    {
        var form = ToolSettingsForms.Describe("FTP", Loaded("""{"host":"ftp.example.org","password":"hunter2"}"""))!;

        var password = form.Single(f => f.Name == "Password");
        password.Kind.ShouldBe(ToolSettingsForms.Secret);
        password.Value.ShouldBeNull();
        password.IsSet.ShouldBeTrue();
        JsonSerializer.Serialize(form).ShouldNotContain("hunter2");
    }

    [Fact]
    public void A_connection_string_is_a_secret_even_without_a_password_mark()
    {
        // It carries the database password; ConfigSecrets protects it by name.
        var form = ToolSettingsForms.Describe("Database", Loaded("""{"connectionString":"Server=db;Password=x"}"""))!;

        form.Single(f => f.Name == "ConnectionString").Kind.ShouldBe(ToolSettingsForms.Secret);
    }

    [Fact]
    public void An_empty_secret_keeps_the_stored_one()
    {
        var (settings, error) = ToolSettingsForms.Apply("FTP", Loaded("""{"host":"old","password":"hunter2"}"""),
            new Dictionary<string, string?> { ["Host"] = "new", ["Password"] = "" });

        error.ShouldBeNull();
        settings!["host"].ShouldBe("new");
        settings["password"]!.ToString().ShouldBe("hunter2");
    }

    [Fact]
    public void Untouched_fields_stay_exactly_as_stored()
    {
        // allowedTables is a JSON array in the file, allowWrite an old key the class only reads,
        // "extra" a key no class knows. Saving another field must leave all three alone.
        var stored = Loaded("""{"type":"mysql","connectionString":"cs","allowedTables":["orders","stock"],"allowWrite":true,"extra":42}""");

        var (settings, _) = ToolSettingsForms.Apply("Database", stored,
            new Dictionary<string, string?> { ["Type"] = "Postgres" });

        settings!["type"].ShouldBe("postgres");
        JsonSerializer.Serialize(settings["allowedTables"]).ShouldBe("""["orders","stock"]""");
        JsonSerializer.Serialize(settings["allowWrite"]).ShouldBe("true");
        JsonSerializer.Serialize(settings["extra"]).ShouldBe("42");
    }

    [Fact]
    public void The_table_list_reads_back_as_names_not_as_json()
    {
        var form = ToolSettingsForms.Describe("Database", Loaded("""{"allowedTables":["orders","stock"]}"""))!;

        form.Single(f => f.Name == "AllowedTables").Value.ShouldBe("orders,stock");
    }

    [Theory]
    [InlineData("Port", "twenty-one")]
    [InlineData("Nonsense", "x")]
    public void A_bad_input_is_refused(string field, string value)
    {
        var (settings, error) = ToolSettingsForms.Apply("FTP", Loaded("{}"),
            new Dictionary<string, string?> { [field] = value });

        settings.ShouldBeNull();
        error.ShouldNotBeNull();
    }

    [Fact]
    public void An_enum_outside_its_values_is_refused()
    {
        var (settings, _) = ToolSettingsForms.Apply("Database", Loaded("{}"),
            new Dictionary<string, string?> { ["AccessLevel"] = "99" });

        settings.ShouldBeNull();
    }

    [Fact]
    public void Saving_through_the_agent_keeps_the_rights()
    {
        using var host = new TestHost();
        host.Host.AgentAdmin.Add(new NewAgent("scout", "Scout", "model")).Ok.ShouldBeTrue();
        host.Host.AgentAdmin.SetToolEnabled("scout", "FTP", true).Ok.ShouldBeTrue();
        host.Host.AgentAdmin.SetToolRights("scout", "FTP", ["list"], ["delete"]).Ok.ShouldBeTrue();

        host.Host.AgentAdmin.ApplyToolSettingsForm("scout", "FTP",
            new Dictionary<string, string?> { ["Host"] = "ftp.example.org" }).Ok.ShouldBeTrue();

        var tool = host.Host.AgentAdmin.Find("scout")!.Tools["FTP"];
        tool["host"].ShouldBe("ftp.example.org");
        tool.ShouldContainKey(Werkzeugrechte.ErlaubtSchluessel);
        tool.ShouldContainKey(Werkzeugrechte.VerbotenSchluessel);
    }

    [Fact]
    public void A_tool_without_a_form_has_none()
        => ToolSettingsForms.Describe("Memory", []).ShouldBeNull();
}