using System.Text.Json;
using System.Text.Json.Serialization;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Driver.Mqtt;

namespace ZB.MOM.WW.OtOpcUa.Driver.Mqtt.Tests;

public sealed class MqttDriverOptionsTests
{
    private static readonly JsonSerializerOptions J = new()
    {
        PropertyNameCaseInsensitive = true,
        UnmappedMemberHandling = JsonUnmappedMemberHandling.Skip,
        Converters = { new JsonStringEnumConverter() },
    };

    [Fact]
    public void Deserialize_SparkplugConfig_ReadsModeAndSubObject()
    {
        const string json = """
        { "host":"10.100.0.35","port":8883,"useTls":true,"mode":"SparkplugB",
          "sparkplug":{"groupId":"Plant1","hostId":"h1","requestRebirthOnGap":true} }
        """;
        var o = JsonSerializer.Deserialize<MqttDriverOptions>(json, J)!;
        o.Mode.ShouldBe(MqttMode.SparkplugB);
        o.UseTls.ShouldBeTrue();
        o.Sparkplug!.GroupId.ShouldBe("Plant1");
        o.Plain.ShouldBeNull();
    }

    [Fact]
    public void Serialize_WritesEnumsAsNames_NotOrdinals()
    {
        var s = JsonSerializer.Serialize(new MqttDriverOptions { Mode = MqttMode.Plain }, J);
        s.ShouldContain("\"Plain\"");
        s.ShouldNotContain("\"mode\":0");
    }
}