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

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

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

    [Fact]
    public void RoundTrip_PreservesKnownFields()
    {
        var original = new OpcUaClientDriverOptions
        {
            EndpointUrl = "opc.tcp://plc.internal:4840",
            ApplicationUri = "urn:plc:OtOpcUa:GatewayClient",
            SessionName = "MySession",
            SecurityMode = OpcUaSecurityMode.SignAndEncrypt,
            SecurityPolicy = OpcUaSecurityPolicy.Basic256Sha256,
            AuthType = OpcUaAuthType.Username,
            Username = "operator",
            Password = "s3cr3t",
            PerEndpointConnectTimeout = TimeSpan.FromSeconds(5),
            Timeout = TimeSpan.FromSeconds(20),
            SessionTimeout = TimeSpan.FromSeconds(180),
            KeepAliveInterval = TimeSpan.FromSeconds(10),
            ReconnectPeriod = TimeSpan.FromSeconds(15),
            AutoAcceptCertificates = true,
            BrowseRoot = "i=85",
            MaxDiscoveredNodes = 5000,
            MaxBrowseDepth = 6,
            TargetNamespaceKind = OpcUaTargetNamespaceKind.SystemPlatform,
            ProbeTimeoutSeconds = 20,
        };

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

        back.ShouldNotBeNull();
        back.EndpointUrl.ShouldBe("opc.tcp://plc.internal:4840");
        back.ApplicationUri.ShouldBe("urn:plc:OtOpcUa:GatewayClient");
        back.SessionName.ShouldBe("MySession");
        back.SecurityMode.ShouldBe(OpcUaSecurityMode.SignAndEncrypt);
        back.SecurityPolicy.ShouldBe(OpcUaSecurityPolicy.Basic256Sha256);
        back.AuthType.ShouldBe(OpcUaAuthType.Username);
        back.Username.ShouldBe("operator");
        back.Password.ShouldBe("s3cr3t");
        back.PerEndpointConnectTimeout.ShouldBe(TimeSpan.FromSeconds(5));
        back.Timeout.ShouldBe(TimeSpan.FromSeconds(20));
        back.SessionTimeout.ShouldBe(TimeSpan.FromSeconds(180));
        back.KeepAliveInterval.ShouldBe(TimeSpan.FromSeconds(10));
        back.ReconnectPeriod.ShouldBe(TimeSpan.FromSeconds(15));
        back.AutoAcceptCertificates.ShouldBeTrue();
        back.BrowseRoot.ShouldBe("i=85");
        back.MaxDiscoveredNodes.ShouldBe(5000);
        back.MaxBrowseDepth.ShouldBe(6);
        back.TargetNamespaceKind.ShouldBe(OpcUaTargetNamespaceKind.SystemPlatform);
        back.ProbeTimeoutSeconds.ShouldBe(20);
    }

    [Fact]
    public void Deserialize_DropsUnknownFields()
    {
        var jsonWithExtra = """{"unknownField":"old-value","probeTimeoutSeconds":20}""";

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

        var back = JsonSerializer.Deserialize<OpcUaClientDriverOptions>(jsonWithExtra, optsWithSkip);
        back.ShouldNotBeNull();
        back.ProbeTimeoutSeconds.ShouldBe(20);
    }
}