using ClawdDotNet.App.Services;
using ClawdDotNet.App.Settings;
using Shouldly;

namespace ClawdDotNet.App.Tests.Services;

/// <summary>
/// #764: The settings the WebUI reads and writes — what the desktop settings page edited.
/// </summary>
public sealed class SettingsAdministrationTests
{
    [Fact]
    public void The_snapshot_never_carries_a_secret()
    {
        using var host = new TestHost();
        host.Host.Instance.OpenRouterApiKey = "sk-or-secret";
        host.Host.Settings.AppSettings.DeploymentcenterToken = "dc-secret";

        var snapshot = host.Host.SettingsAdmin.Snapshot();

        snapshot.OpenRouterApiKeySet.ShouldBeTrue();
        snapshot.DeploymentcenterTokenSet.ShouldBeTrue();
        System.Text.Json.JsonSerializer.Serialize(snapshot).ShouldNotContain("secret");
    }

    [Fact]
    public void Instance_settings_survive_a_restart()
    {
        using var host = new TestHost();
        host.Host.Directories.SaveInstanceConfig(host.Host.InstancePath, host.Host.Instance);

        var result = host.Host.SettingsAdmin.Update(new SettingsUpdate(
            InstanceName: "Renamed", AutostartByManager: true, DailyCostUsd: 2.5m, DailyTokens: 900,
            AutoBackupEnabled: true, AutoBackupTime: "4:30", BackupKeepCount: 7));

        result.Ok.ShouldBeTrue(result.Message);

        var reloaded = host.Host.Directories.LoadInstanceConfig(host.Host.InstancePath);
        reloaded.InstanceName.ShouldBe("Renamed");
        reloaded.AutostartByManager.ShouldBeTrue();
        reloaded.Budget.DailyCostUsd.ShouldBe(2.5m);
        reloaded.Budget.DailyTokens.ShouldBe(900);
        reloaded.AutoBackupEnabled.ShouldBeTrue();
        reloaded.AutoBackupTime.ShouldBe("04:30");
        reloaded.BackupKeepCount.ShouldBe(7);
    }

    [Fact]
    public void An_empty_secret_keeps_the_one_there_is()
    {
        // The form never gets the key back, so it sends an empty field. That must not wipe it.
        using var host = new TestHost();
        host.Host.Instance.OpenRouterApiKey = "sk-or-keep";
        host.Host.Settings.AppSettings.DeploymentcenterToken = "dc-keep";

        host.Host.SettingsAdmin.Update(new SettingsUpdate(OpenRouterApiKey: "", DeploymentcenterToken: "  ")).Ok.ShouldBeTrue();

        host.Host.Instance.OpenRouterApiKey.ShouldBe("sk-or-keep");
        host.Host.Settings.AppSettings.DeploymentcenterToken.ShouldBe("dc-keep");
    }

    [Fact]
    public void A_new_key_says_it_needs_a_restart()
    {
        // The engine is built at start; without saying so the save button would seem to do nothing.
        using var host = new TestHost();

        var result = host.Host.SettingsAdmin.Update(new SettingsUpdate(OpenRouterApiKey: "sk-or-new"));

        result.Ok.ShouldBeTrue();
        result.Message.ShouldContain("restart");
        host.Host.Instance.OpenRouterApiKey.ShouldBe("sk-or-new");
    }

    [Fact]
    public void Application_settings_are_written_to_settings_json()
    {
        using var host = new TestHost();

        host.Host.SettingsAdmin.Update(new SettingsUpdate(
            MinimumLogLevel: "warn", UpdateChannel: "beta", ErrorReportingEnabled: false)).Ok.ShouldBeTrue();

        var root = Path.GetDirectoryName(host.Host.Settings.SettingsPath)!;
        var reloaded = new SettingsManager(root);
        reloaded.Load();
        reloaded.AppSettings.MinimumLogLevel.ShouldBe("Warn");
        reloaded.AppSettings.UpdateChannel.ShouldBe("beta");
        reloaded.AppSettings.ErrorReportingEnabled.ShouldBeFalse();
    }

    [Theory]
    [InlineData("time")]
    [InlineData("level")]
    [InlineData("url")]
    [InlineData("channel")]
    [InlineData("name")]
    [InlineData("keep")]
    public void One_bad_value_changes_nothing(string bad)
    {
        using var host = new TestHost();
        var update = bad switch
        {
            "time" => new SettingsUpdate(DailyTokens: 5, AutoBackupTime: "25:00"),
            "level" => new SettingsUpdate(DailyTokens: 5, MinimumLogLevel: "Chatty"),
            "url" => new SettingsUpdate(DailyTokens: 5, OpenRouterBaseUrl: "file:///etc/passwd"),
            "channel" => new SettingsUpdate(DailyTokens: 5, UpdateChannel: "nightly"),
            "name" => new SettingsUpdate(DailyTokens: 5, InstanceName: " "),
            _ => new SettingsUpdate(DailyTokens: 5, BackupKeepCount: -1)
        };

        host.Host.SettingsAdmin.Update(update).Ok.ShouldBeFalse();

        host.Host.Instance.Budget.DailyTokens.ShouldBe(0);
        host.Changes.ShouldBeEmpty();
    }
}