using Microsoft.Extensions.Options;

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

/// <summary>
/// Regression: <see cref="CommunicationOptions"/> timeouts feed per-pattern Ask
/// deadlines and gRPC keepalive/stream-lifetime settings; a zero/negative value
/// (or a non-positive <c>GrpcMaxConcurrentStreams</c>) must be rejected at startup
/// by an <see cref="IValidateOptions{TOptions}"/> with a clear, key-naming message
/// rather than surfacing at first Ask/gRPC use.
/// </summary>
public class CommunicationOptionsValidatorTests
{
    private static ValidateOptionsResult Validate(CommunicationOptions options) =>
        new CommunicationOptionsValidator().Validate(Options.DefaultName, options);

    [Fact]
    public void DefaultOptions_AreValid()
    {
        var result = Validate(new CommunicationOptions());
        Assert.True(result.Succeeded, result.FailureMessage);
    }

    [Fact]
    public void ZeroDeploymentTimeout_IsRejected()
    {
        var result = Validate(new CommunicationOptions { DeploymentTimeout = TimeSpan.Zero });
        Assert.True(result.Failed);
        Assert.Contains("DeploymentTimeout", result.FailureMessage);
    }

    [Fact]
    public void NonPositiveGrpcMaxConcurrentStreams_IsRejected()
    {
        var result = Validate(new CommunicationOptions { GrpcMaxConcurrentStreams = 0 });
        Assert.True(result.Failed);
        Assert.Contains("GrpcMaxConcurrentStreams", result.FailureMessage);
    }

    // ── Aggregated live alarm cache options (plan #10, Task 6) ───────────────────

    [Fact]
    public void ZeroLiveAlarmCacheLinger_IsValid()
    {
        // Zero linger = stop the aggregator immediately when the last viewer leaves.
        var result = Validate(new CommunicationOptions { LiveAlarmCacheLinger = TimeSpan.Zero });
        Assert.True(result.Succeeded, result.FailureMessage);
    }

    [Fact]
    public void NegativeLiveAlarmCacheLinger_IsRejected()
    {
        var result = Validate(new CommunicationOptions { LiveAlarmCacheLinger = TimeSpan.FromSeconds(-1) });
        Assert.True(result.Failed);
        Assert.Contains("LiveAlarmCacheLinger", result.FailureMessage);
    }

    [Fact]
    public void ZeroLiveAlarmCacheReconcileInterval_IsRejected()
    {
        var result = Validate(new CommunicationOptions { LiveAlarmCacheReconcileInterval = TimeSpan.Zero });
        Assert.True(result.Failed);
        Assert.Contains("LiveAlarmCacheReconcileInterval", result.FailureMessage);
    }

    [Fact]
    public void ZeroLiveAlarmCacheSeedConcurrency_IsRejected()
    {
        var result = Validate(new CommunicationOptions { LiveAlarmCacheSeedConcurrency = 0 });
        Assert.True(result.Failed);
        Assert.Contains("LiveAlarmCacheSeedConcurrency", result.FailureMessage);
    }

    [Fact]
    public void ExcessiveLiveAlarmCacheSeedConcurrency_IsRejected()
    {
        var result = Validate(new CommunicationOptions { LiveAlarmCacheSeedConcurrency = 65 });
        Assert.True(result.Failed);
        Assert.Contains("LiveAlarmCacheSeedConcurrency", result.FailureMessage);
    }

    [Fact]
    public void ZeroLiveAlarmCacheMaxSubscribersPerSite_IsRejected()
    {
        var result = Validate(new CommunicationOptions { LiveAlarmCacheMaxSubscribersPerSite = 0 });
        Assert.True(result.Failed);
        Assert.Contains("LiveAlarmCacheMaxSubscribersPerSite", result.FailureMessage);
    }
}