using System.Text.Json;
using System.Text.Json.Serialization;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.AdminUI.Components.Pages.Clusters.Drivers;
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,
    };

    private static readonly JsonSerializerOptions TestJsonOpts = new()
    {
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
        UnmappedMemberHandling = JsonUnmappedMemberHandling.Skip,
    };

    [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);
    }

    [Fact]
    public void DeviceRow_round_trips_through_definition()
    {
        var row = new AbLegacyDriverPage.AbLegacyDeviceRow
        {
            HostAddress = "10.0.0.10", PlcFamily = AbLegacyPlcFamily.MicroLogix, DeviceName = "PLC-A",
        };
        var def = row.ToDefinition();
        var back = AbLegacyDriverPage.AbLegacyDeviceRow.FromDefinition(def);

        back.HostAddress.ShouldBe("10.0.0.10");
        back.PlcFamily.ShouldBe(AbLegacyPlcFamily.MicroLogix);
        back.DeviceName.ShouldBe("PLC-A");
    }

    [Fact]
    public void DeviceRow_preserves_unedited_fields()
    {
        var original = new AbLegacyDeviceOptions("10.0.0.10", AbLegacyPlcFamily.Plc5, "PLC-A");
        var row = AbLegacyDriverPage.AbLegacyDeviceRow.FromDefinition(original);
        row.HostAddress = "10.0.0.20";

        var back = row.ToDefinition();
        back.HostAddress.ShouldBe("10.0.0.20");
        back.PlcFamily.ShouldBe(AbLegacyPlcFamily.Plc5);
        back.DeviceName.ShouldBe("PLC-A");
    }

    [Fact]
    public void TagRow_round_trips_through_definition()
    {
        var row = new AbLegacyDriverPage.AbLegacyTagRow
        {
            Name = "Level", DeviceHostAddress = "10.0.0.10", Address = "N7:5",
            DataType = AbLegacyDataType.Int, Writable = true,
        };
        var def = row.ToDefinition();
        var back = AbLegacyDriverPage.AbLegacyTagRow.FromDefinition(def);

        back.Name.ShouldBe("Level");
        back.DeviceHostAddress.ShouldBe("10.0.0.10");
        back.Address.ShouldBe("N7:5");
        back.DataType.ShouldBe(AbLegacyDataType.Int);
        back.Writable.ShouldBeTrue();
    }

    [Fact]
    public void TagRow_preserves_unedited_fields()
    {
        var original = new AbLegacyTagDefinition(
            "Level", "10.0.0.10", "N7:5", AbLegacyDataType.Int,
            Writable: true, WriteIdempotent: true);
        var row = AbLegacyDriverPage.AbLegacyTagRow.FromDefinition(original);
        row.Name = "Renamed";

        var back = row.ToDefinition();
        back.Name.ShouldBe("Renamed");
        back.WriteIdempotent.ShouldBeTrue();
    }

    [Fact]
    public void ValidateDeviceRow_rejects_duplicate_host()
    {
        var rows = new List<AbLegacyDriverPage.AbLegacyDeviceRow> { new() { HostAddress = "10.0.0.10" } };
        AbLegacyDriverPage.AbLegacyDeviceRow.ValidateRow(new() { HostAddress = "10.0.0.10" }, rows, null)
            .ShouldNotBeNull();
    }

    [Fact]
    public void ValidateTagRow_rejects_duplicate_name()
    {
        var rows = new List<AbLegacyDriverPage.AbLegacyTagRow> { new() { Name = "Level" } };
        AbLegacyDriverPage.AbLegacyTagRow.ValidateRow(new() { Name = "Level" }, rows, null)
            .ShouldNotBeNull();
    }

    [Fact]
    public void Device_and_tag_lists_survive_options_serialize_round_trip()
    {
        var devices = new List<AbLegacyDeviceOptions>
        {
            new("10.0.0.10", AbLegacyPlcFamily.Slc500, "PLC-1"),
            new("10.0.0.11", AbLegacyPlcFamily.MicroLogix, "PLC-2"),
        };
        var tags = new List<AbLegacyTagDefinition>
        {
            new("Level", "10.0.0.10", "N7:5", AbLegacyDataType.Int),
            new("Pump", "10.0.0.11", "B3:0/0", AbLegacyDataType.Bit),
        };
        var opts = new AbLegacyDriverPage.FormModel().ToOptions(devices, tags);
        var json = JsonSerializer.Serialize(opts, TestJsonOpts);
        var back = JsonSerializer.Deserialize<AbLegacyDriverOptions>(json, TestJsonOpts)!;
        back.Devices.Count.ShouldBe(2);
        back.Devices[0].HostAddress.ShouldBe("10.0.0.10");
        back.Tags.Count.ShouldBe(2);
        back.Tags[0].Name.ShouldBe("Level");
    }
}
