ScadaBridge/tests/ZB.MOM.WW.ScadaBridge.DelmiaNotifier.Tests/NotifierTests.cs

using ZB.MOM.WW.ScadaBridge.DelmiaNotifier;

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

public class NotifierTests
{
    private sealed class FakeSender(params AttemptOutcome[] outcomes) : IRecipeSender
    {
        private readonly Queue<AttemptOutcome> _outcomes = new(outcomes);
        public int Calls { get; private set; }

        public Task<AttemptOutcome> SendAsync(string baseUrl, RecipeDownload payload, CancellationToken ct)
        {
            Calls++;
            return Task.FromResult(_outcomes.Dequeue());
        }
    }

    private static readonly string[] TwoUrls = ["http://a", "http://b"];
    private static readonly RecipeDownload Payload =
        new() { MachineCode = "Z", DownloadPath = "x", WorkOrderNumber = "W", PartNumber = "P" };

    [Fact]
    public async Task ConnectFailure_advances_to_next_url()
    {
        var sender = new FakeSender(
            new AttemptOutcome(AttemptKind.ConnectFailed, 0, null, "refused"),
            new AttemptOutcome(AttemptKind.Connected, 200, new RecipeDownloadResult { Result = true }, null));
        var result = await Notifier.RunAsync(TwoUrls, Payload, sender, CancellationToken.None);
        Assert.True(result.Ok);
        Assert.Equal(2, sender.Calls);
    }

    [Fact]
    public async Task Connected_result_false_is_final_no_failover()
    {
        var sender = new FakeSender(
            new AttemptOutcome(AttemptKind.Connected, 200, new RecipeDownloadResult { Result = false, ResultText = "bad machine" }, null),
            new AttemptOutcome(AttemptKind.Connected, 200, new RecipeDownloadResult { Result = true }, null));
        var result = await Notifier.RunAsync(TwoUrls, Payload, sender, CancellationToken.None);
        Assert.False(result.Ok);
        Assert.Contains("bad machine", result.Reason);
        Assert.Equal(1, sender.Calls);
    }

    [Fact]
    public async Task Connected_5xx_is_final_no_failover()
    {
        var sender = new FakeSender(
            new AttemptOutcome(AttemptKind.Connected, 500, null, null),
            new AttemptOutcome(AttemptKind.Connected, 200, new RecipeDownloadResult { Result = true }, null));
        var result = await Notifier.RunAsync(TwoUrls, Payload, sender, CancellationToken.None);
        Assert.False(result.Ok);
        Assert.Contains("500", result.Reason);
        Assert.Equal(1, sender.Calls);
    }

    [Fact]
    public async Task All_connect_failures_report_unreachable_with_last_error()
    {
        var sender = new FakeSender(
            new AttemptOutcome(AttemptKind.ConnectFailed, 0, null, "refused-a"),
            new AttemptOutcome(AttemptKind.ConnectFailed, 0, null, "refused-b"));
        var result = await Notifier.RunAsync(TwoUrls, Payload, sender, CancellationToken.None);
        Assert.False(result.Ok);
        Assert.Contains("unreachable", result.Reason);
        Assert.Contains("refused-b", result.Reason);
        Assert.Equal(2, sender.Calls);
    }
}