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

namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests;

public sealed class AbLegacyDriverPageFormSerializationTests
{
    private static readonly JsonSerializerOptions _opts = new()
    {
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
        WriteIndented = false,
    };

    [Fact]
    public void RoundTrip_PreservesKnownFields()
    {
        var original = new AbLegacyDriverOptions
        {
            Timeout = TimeSpan.FromSeconds(4),
            Probe = new AbLegacyProbeOptions
            {
                Enabled = true,
                Interval = TimeSpan.FromSeconds(8),
                Timeout = TimeSpan.FromSeconds(3),
                ProbeAddress = "N7:0",
            },
            ProbeTimeoutSeconds = 10,
            Devices =
            [
                new AbLegacyDeviceOptions("10.0.0.10", AbLegacyPlcFamily.Slc500, "PLC-A"),
                new AbLegacyDeviceOptions("10.0.0.11", AbLegacyPlcFamily.MicroLogix),
            ],
            Tags =
            [
                new AbLegacyTagDefinition("Level", "10.0.0.10", "N7:5", AbLegacyDataType.Int, Writable: false),
                new AbLegacyTagDefinition("Pump", "10.0.0.10", "B3:0/0", AbLegacyDataType.Bit, Writable: true),
            ],
        };

        var json = JsonSerializer.Serialize(original, _opts);
        var back = JsonSerializer.Deserialize<AbLegacyDriverOptions>(json, _opts);

        back.ShouldNotBeNull();
        back.Timeout.ShouldBe(TimeSpan.FromSeconds(4));
        back.Probe.Enabled.ShouldBeTrue();
        back.Probe.Interval.ShouldBe(TimeSpan.FromSeconds(8));
        back.Probe.Timeout.ShouldBe(TimeSpan.FromSeconds(3));
        back.Probe.ProbeAddress.ShouldBe("N7:0");
        back.ProbeTimeoutSeconds.ShouldBe(10);
        back.Devices.Count.ShouldBe(2);
        back.Devices[0].HostAddress.ShouldBe("10.0.0.10");
        back.Devices[0].PlcFamily.ShouldBe(AbLegacyPlcFamily.Slc500);
        back.Devices[0].DeviceName.ShouldBe("PLC-A");
        back.Devices[1].PlcFamily.ShouldBe(AbLegacyPlcFamily.MicroLogix);
        back.Tags.Count.ShouldBe(2);
        back.Tags[0].Name.ShouldBe("Level");
        back.Tags[0].Address.ShouldBe("N7:5");
        back.Tags[0].DataType.ShouldBe(AbLegacyDataType.Int);
        back.Tags[0].Writable.ShouldBeFalse();
        back.Tags[1].DataType.ShouldBe(AbLegacyDataType.Bit);
    }

    [Fact]
    public void Deserialize_DropsUnknownFields()
    {
        var jsonWithExtra = """{"unknownField":"old-value","probeTimeoutSeconds":10}""";

        var optsWithSkip = new JsonSerializerOptions(_opts)
        {
            UnmappedMemberHandling = JsonUnmappedMemberHandling.Skip,
        };

        var back = JsonSerializer.Deserialize<AbLegacyDriverOptions>(jsonWithExtra, optsWithSkip);
        back.ShouldNotBeNull();
        back.ProbeTimeoutSeconds.ShouldBe(10);
    }
}