using Microsoft.Extensions.Options;

namespace ZB.MOM.WW.ScadaBridge.NotificationService.Tests;

/// <summary>
/// Arch-review 08 §1.5: <see cref="NotificationOptions"/> supplies the SMTP fallback
/// connection timeout and max-concurrent-connections used by the central Email delivery
/// adapter when the deployed <c>SmtpConfiguration</c> leaves them unset. A non-positive
/// value there is not a usable fallback; reject it fast at startup with a key-naming message.
/// </summary>
public class NotificationOptionsValidatorTests
{
    private static ValidateOptionsResult Validate(NotificationOptions options) =>
        new NotificationOptionsValidator().Validate(Options.DefaultName, options);

    /// <summary>Verifies that the default options pass validation.</summary>
    [Fact]
    public void DefaultOptions_AreValid()
    {
        var result = Validate(new NotificationOptions());
        Assert.True(result.Succeeded, result.FailureMessage);
    }

    /// <summary>Verifies that a zero connection timeout is rejected.</summary>
    [Fact]
    public void ZeroConnectionTimeoutSeconds_IsRejected()
    {
        var result = Validate(new NotificationOptions { ConnectionTimeoutSeconds = 0 });

        Assert.True(result.Failed);
        Assert.Contains("ConnectionTimeoutSeconds", result.FailureMessage);
    }

    /// <summary>Verifies that a negative connection timeout is rejected.</summary>
    [Fact]
    public void NegativeConnectionTimeoutSeconds_IsRejected()
    {
        var result = Validate(new NotificationOptions { ConnectionTimeoutSeconds = -1 });

        Assert.True(result.Failed);
        Assert.Contains("ConnectionTimeoutSeconds", result.FailureMessage);
    }

    /// <summary>Verifies that a zero maximum concurrent connection count is rejected.</summary>
    [Fact]
    public void ZeroMaxConcurrentConnections_IsRejected()
    {
        var result = Validate(new NotificationOptions { MaxConcurrentConnections = 0 });

        Assert.True(result.Failed);
        Assert.Contains("MaxConcurrentConnections", result.FailureMessage);
    }

    /// <summary>Verifies that a negative maximum concurrent connection count is rejected.</summary>
    [Fact]
    public void NegativeMaxConcurrentConnections_IsRejected()
    {
        var result = Validate(new NotificationOptions { MaxConcurrentConnections = -1 });

        Assert.True(result.Failed);
        Assert.Contains("MaxConcurrentConnections", result.FailureMessage);
    }
}