using FluentAssertions;
using IBKRTrader.Core.Settings;
using IBKRTrader.Hosting.Web;

namespace IBKRTrader.Tests.Web;

[Trait("cat", "unit")]
public class AuthServiceTests
{
    [Fact]
    public void ValidateToken_ReturnsTrueForCorrectToken()
    {
        var settings = new SettingsService();
        settings.Settings.Webserver.AuthToken = "secret-token-123";
        var sut = new AuthService(settings);

        sut.IsConfigured.Should().BeTrue();
        sut.ValidateToken("secret-token-123").Should().BeTrue();
        sut.ValidateToken("wrong-token").Should().BeFalse();
        sut.ValidateToken("").Should().BeFalse();
    }

    [Fact]
    public void ValidateToken_ReturnsFalseWhenNotConfigured()
    {
        var settings = new SettingsService();
        settings.Settings.Webserver.AuthToken = "";
        var sut = new AuthService(settings);

        sut.IsConfigured.Should().BeFalse();
        sut.ValidateToken("any-token").Should().BeFalse();
    }

    [Fact]
    public void SessionToken_RoundTrip_ValidatesSuccessfully()
    {
        var settings = new SettingsService();
        settings.Settings.Webserver.AuthToken = "my-secret-key";
        var sut = new AuthService(settings);

        var sessionToken = sut.CreateSessionToken(TimeSpan.FromHours(1));

        sessionToken.Should().NotBeNullOrWhiteSpace();
        sut.ValidateSessionToken(sessionToken).Should().BeTrue();
    }

    [Fact]
    public void SessionToken_TamperedToken_FailsValidation()
    {
        var settings = new SettingsService();
        settings.Settings.Webserver.AuthToken = "my-secret-key";
        var sut = new AuthService(settings);

        var sessionToken = sut.CreateSessionToken(TimeSpan.FromHours(1));
        var tampered = sessionToken + "tamper";

        sut.ValidateSessionToken(tampered).Should().BeFalse();
    }

    [Fact]
    public void SessionToken_ExpiredToken_FailsValidation()
    {
        var settings = new SettingsService();
        settings.Settings.Webserver.AuthToken = "my-secret-key";
        var sut = new AuthService(settings);

        // Abgelaufenes Token (minus 1 Sekunde)
        var sessionToken = sut.CreateSessionToken(TimeSpan.FromSeconds(-10));

        sut.ValidateSessionToken(sessionToken).Should().BeFalse();
    }

    [Fact]
    public void IsAuthenticated_RecognizesBearerHeader()
    {
        var settings = new SettingsService();
        settings.Settings.Webserver.AuthToken = "my-secret-key";
        var sut = new AuthService(settings);

        var ctx = new Microsoft.AspNetCore.Http.DefaultHttpContext();
        ctx.Request.Headers.Authorization = "Bearer my-secret-key";

        sut.IsAuthenticated(ctx).Should().BeTrue();
    }

    /// <summary>
    /// Der Token im Query-String gilt <b>nur</b> für den SSE-Strom. EventSource kann keine
    /// Kopfzeilen setzen – das ist der einzige Grund, aus dem es diesen Weg gibt.
    /// </summary>
    [Fact]
    public void IsAuthenticated_AcceptsQueryToken_OnTheLogStream()
    {
        var sut = SutWithToken("my-secret-key");

        var ctx = new Microsoft.AspNetCore.Http.DefaultHttpContext();
        ctx.Request.Path        = "/api/logs/stream";
        ctx.Request.QueryString = new Microsoft.AspNetCore.Http.QueryString("?token=my-secret-key");

        sut.IsAuthenticated(ctx).Should().BeTrue();
    }

    /// <summary>
    /// Überall sonst zählt er nicht. Ein Query-String landet in Server-Logs, im Browserverlauf und
    /// in Referer-Kopfzeilen; ein Geheimnis hat dort nichts zu suchen, wo ein anderer Weg offensteht.
    /// </summary>
    [Fact]
    public void IsAuthenticated_IgnoresQueryToken_EverywhereElse()
    {
        var sut = SutWithToken("my-secret-key");

        var ctx = new Microsoft.AspNetCore.Http.DefaultHttpContext();
        ctx.Request.Path        = "/api/positions";
        ctx.Request.QueryString = new Microsoft.AspNetCore.Http.QueryString("?token=my-secret-key");

        sut.IsAuthenticated(ctx).Should().BeFalse();
    }

    private static AuthService SutWithToken(string token)
    {
        var settings = new SettingsService();
        settings.Settings.Webserver.AuthToken = token;
        return new AuthService(settings);
    }

    [Fact]
    public void IsAuthenticated_RejectsUnauthenticatedRequest()
    {
        var settings = new SettingsService();
        settings.Settings.Webserver.AuthToken = "my-secret-key";
        var sut = new AuthService(settings);

        var ctx = new Microsoft.AspNetCore.Http.DefaultHttpContext();

        sut.IsAuthenticated(ctx).Should().BeFalse();
    }
}