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

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

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

    [Fact]
    public void RoundTrip_PreservesKnownFields()
    {
        var original = new TwinCATDriverOptions
        {
            Timeout = TimeSpan.FromSeconds(4),
            UseNativeNotifications = false,
            EnableControllerBrowse = true,
            NotificationMaxDelayMs = 50,
            Probe = new TwinCATProbeOptions
            {
                Enabled = false,
                Interval = TimeSpan.FromSeconds(10),
                Timeout = TimeSpan.FromSeconds(3),
            },
            ProbeTimeoutSeconds = 20,
            Devices = [],
            Tags = [],
        };

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

        back.ShouldNotBeNull();
        back.Timeout.ShouldBe(TimeSpan.FromSeconds(4));
        back.UseNativeNotifications.ShouldBeFalse();
        back.EnableControllerBrowse.ShouldBeTrue();
        back.NotificationMaxDelayMs.ShouldBe(50);
        back.Probe.ShouldNotBeNull();
        back.Probe.Enabled.ShouldBeFalse();
        back.Probe.Interval.ShouldBe(TimeSpan.FromSeconds(10));
        back.Probe.Timeout.ShouldBe(TimeSpan.FromSeconds(3));
        back.ProbeTimeoutSeconds.ShouldBe(20);
        back.Devices.ShouldBeEmpty();
        back.Tags.ShouldBeEmpty();
    }

    [Fact]
    public void Deserialize_DropsUnknownFields()
    {
        var jsonWithExtra = """{"unknownField":"old-value","probeTimeoutSeconds":25}""";
        var optsSkip = new JsonSerializerOptions(_opts)
        {
            UnmappedMemberHandling = JsonUnmappedMemberHandling.Skip,
        };
        var back = JsonSerializer.Deserialize<TwinCATDriverOptions>(jsonWithExtra, optsSkip);
        back.ShouldNotBeNull();
        back.ProbeTimeoutSeconds.ShouldBe(25);
    }

    [Fact]
    public void FormModel_RoundTrip_PreservesEditableFields()
    {
        var opts = new TwinCATDriverOptions
        {
            Timeout = TimeSpan.FromSeconds(3),
            UseNativeNotifications = true,
            EnableControllerBrowse = false,
            NotificationMaxDelayMs = 100,
            Probe = new TwinCATProbeOptions
            {
                Enabled = true,
                Interval = TimeSpan.FromSeconds(6),
                Timeout = TimeSpan.FromSeconds(2),
            },
            ProbeTimeoutSeconds = 15,
        };

        var form = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.FormModel.FromOptions(opts);
        var roundTripped = form.ToOptions([], []);

        roundTripped.Timeout.ShouldBe(TimeSpan.FromSeconds(3));
        roundTripped.UseNativeNotifications.ShouldBeTrue();
        roundTripped.EnableControllerBrowse.ShouldBeFalse();
        roundTripped.NotificationMaxDelayMs.ShouldBe(100);
        roundTripped.Probe.Enabled.ShouldBeTrue();
        roundTripped.Probe.Interval.ShouldBe(TimeSpan.FromSeconds(6));
        roundTripped.Probe.Timeout.ShouldBe(TimeSpan.FromSeconds(2));
        roundTripped.ProbeTimeoutSeconds.ShouldBe(15);
    }

    [Fact]
    public void DeviceRow_RoundTrip_PreservesEditableFields()
    {
        var def = new TwinCATDeviceOptions("192.168.0.1.1.1:851", "PLC1");

        var row = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATDeviceRow.FromDefinition(def);
        var back = row.ToDefinition();

        back.HostAddress.ShouldBe("192.168.0.1.1.1:851");
        back.DeviceName.ShouldBe("PLC1");
    }

    [Fact]
    public void DeviceRow_CarriesThroughUneditedSourceFields()
    {
        // Edit only DeviceName; HostAddress on the source must survive the round-trip via _source.
        var def = new TwinCATDeviceOptions("10.0.0.5.1.1:851", "Original");

        var row = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATDeviceRow.FromDefinition(def);
        row.DeviceName = "Renamed";
        var back = row.ToDefinition();

        back.HostAddress.ShouldBe("10.0.0.5.1.1:851");
        back.DeviceName.ShouldBe("Renamed");
    }

    [Fact]
    public void DeviceRow_ValidateRow_RejectsDuplicateHostAddress()
    {
        var existing = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATDeviceRow.FromDefinition(new TwinCATDeviceOptions("192.168.0.1.1.1:851"));
        var dup = new ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATDeviceRow { HostAddress = "192.168.0.1.1.1:851" };

        var all = new[] { existing, dup };
        var error = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATDeviceRow.ValidateRow(dup, all, editIndex: 1);

        error.ShouldNotBeNull();
        error.ShouldContain("Duplicate");
    }

    [Fact]
    public void TagRow_RoundTrip_PreservesEditableFields()
    {
        var def = new TwinCATTagDefinition("Speed", "192.168.0.1.1.1:851", "MAIN.rSpeed", TwinCATDataType.Real, Writable: false);

        var row = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATTagRow.FromDefinition(def);
        var back = row.ToDefinition();

        back.Name.ShouldBe("Speed");
        back.DeviceHostAddress.ShouldBe("192.168.0.1.1.1:851");
        back.SymbolPath.ShouldBe("MAIN.rSpeed");
        back.DataType.ShouldBe(TwinCATDataType.Real);
        back.Writable.ShouldBeFalse();
    }

    [Fact]
    public void TagRow_CarriesThroughUneditedWriteIdempotent()
    {
        // WriteIdempotent is not exposed by the editor; it must survive a load→edit→save via _source.
        var def = new TwinCATTagDefinition("Cmd", "192.168.0.1.1.1:851", "GVL.Start", TwinCATDataType.Bool,
            Writable: true, WriteIdempotent: true);

        var row = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATTagRow.FromDefinition(def);
        row.Name = "CmdRenamed"; // touch an edited field
        var back = row.ToDefinition();

        back.Name.ShouldBe("CmdRenamed");
        back.WriteIdempotent.ShouldBeTrue();
    }

    [Fact]
    public void TagRow_ValidateRow_RejectsDuplicateName()
    {
        var existing = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATTagRow.FromDefinition(
                new TwinCATTagDefinition("Speed", "192.168.0.1.1.1:851", "MAIN.rSpeed", TwinCATDataType.Real));
        var dup = new ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATTagRow { Name = "SPEED" }; // case-insensitive collision

        var all = new[] { existing, dup };
        var error = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.TwinCATTagRow.ValidateRow(dup, all, editIndex: 1);

        error.ShouldNotBeNull();
        error.ShouldContain("Duplicate");
    }

    [Fact]
    public void FormModel_ToOptions_SerializesDeviceAndTagLists()
    {
        var form = ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers
            .TwinCATDriverPage.FormModel.FromOptions(new TwinCATDriverOptions());

        var devices = new[] { new TwinCATDeviceOptions("192.168.0.1.1.1:851", "PLC1") };
        var tags = new[]
        {
            new TwinCATTagDefinition("Speed", "192.168.0.1.1.1:851", "MAIN.rSpeed", TwinCATDataType.Real,
                Writable: true, WriteIdempotent: true),
        };

        var opts = form.ToOptions(devices, tags);
        var json = JsonSerializer.Serialize(opts, _opts);
        var back = JsonSerializer.Deserialize<TwinCATDriverOptions>(json, _opts);

        back.ShouldNotBeNull();
        back.Devices.Count.ShouldBe(1);
        back.Devices[0].HostAddress.ShouldBe("192.168.0.1.1.1:851");
        back.Devices[0].DeviceName.ShouldBe("PLC1");
        back.Tags.Count.ShouldBe(1);
        back.Tags[0].Name.ShouldBe("Speed");
        back.Tags[0].DeviceHostAddress.ShouldBe("192.168.0.1.1.1:851");
        back.Tags[0].SymbolPath.ShouldBe("MAIN.rSpeed");
        back.Tags[0].DataType.ShouldBe(TwinCATDataType.Real);
        back.Tags[0].Writable.ShouldBeTrue();
        back.Tags[0].WriteIdempotent.ShouldBeTrue();
    }
}