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

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

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

    [Fact]
    public void RoundTrip_PreservesKnownFields()
    {
        var original = new GalaxyDriverOptions(
            Gateway: new GalaxyGatewayOptions(
                Endpoint: "https://gw.internal:5001",
                ApiKeySecretRef: "env:MY_API_KEY",
                UseTls: true,
                CaCertificatePath: "C:\\certs\\ca.pem",
                ConnectTimeoutSeconds: 15,
                DefaultCallTimeoutSeconds: 45,
                StreamTimeoutSeconds: 0),
            MxAccess: new GalaxyMxAccessOptions(
                ClientName: "OtOpcUa-Primary",
                PublishingIntervalMs: 500,
                WriteUserId: 1,
                EventPumpChannelCapacity: 100_000),
            Repository: new GalaxyRepositoryOptions(
                DiscoverPageSize: 2000,
                WatchDeployEvents: false),
            Reconnect: new GalaxyReconnectOptions(
                InitialBackoffMs: 1000,
                MaxBackoffMs: 60_000,
                ReplayOnSessionLost: false))
        {
            ProbeTimeoutSeconds = 45,
        };

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

        back.ShouldNotBeNull();
        back.Gateway.Endpoint.ShouldBe("https://gw.internal:5001");
        back.Gateway.ApiKeySecretRef.ShouldBe("env:MY_API_KEY");
        back.Gateway.UseTls.ShouldBeTrue();
        back.Gateway.CaCertificatePath.ShouldBe("C:\\certs\\ca.pem");
        back.Gateway.ConnectTimeoutSeconds.ShouldBe(15);
        back.Gateway.DefaultCallTimeoutSeconds.ShouldBe(45);
        back.Gateway.StreamTimeoutSeconds.ShouldBe(0);
        back.MxAccess.ClientName.ShouldBe("OtOpcUa-Primary");
        back.MxAccess.PublishingIntervalMs.ShouldBe(500);
        back.MxAccess.WriteUserId.ShouldBe(1);
        back.MxAccess.EventPumpChannelCapacity.ShouldBe(100_000);
        back.Repository.DiscoverPageSize.ShouldBe(2000);
        back.Repository.WatchDeployEvents.ShouldBeFalse();
        back.Reconnect.InitialBackoffMs.ShouldBe(1000);
        back.Reconnect.MaxBackoffMs.ShouldBe(60_000);
        back.Reconnect.ReplayOnSessionLost.ShouldBeFalse();
        back.ProbeTimeoutSeconds.ShouldBe(45);
    }

    [Fact]
    public void Deserialize_DropsUnknownFields()
    {
        // Minimal JSON that sets only ProbeTimeoutSeconds and an unknown field.
        // The nested records must supply their required positional args for JSON deserialization
        // to succeed — provide them here so the test exercises the Unknown-field skip path.
        var jsonWithExtra = """
            {
              "unknownField": "old-value",
              "gateway": { "endpoint": "https://localhost:5001", "apiKeySecretRef": "dev:test" },
              "mxAccess": { "clientName": "OtOpcUa" },
              "repository": {},
              "reconnect": {},
              "probeTimeoutSeconds": 20
            }
            """;

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

        var back = JsonSerializer.Deserialize<GalaxyDriverOptions>(jsonWithExtra, optsWithSkip);
        back.ShouldNotBeNull();
        back.ProbeTimeoutSeconds.ShouldBe(20);
        back.Gateway.Endpoint.ShouldBe("https://localhost:5001");
    }
}