using System.Linq;
using System.Text.Json;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Configuration.Entities;
using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
using ZB.MOM.WW.OtOpcUa.OpcUaServer;
using ZB.MOM.WW.OtOpcUa.Runtime.Drivers;

namespace ZB.MOM.WW.OtOpcUa.Runtime.Tests.Drivers;

/// <summary>
///     Verifies the artifact-decode mirror (<see cref="DeploymentArtifact.ParseComposition(System.ReadOnlySpan{byte})"/>)
///     treats a Galaxy point as an ordinary equipment tag — an equipment-scoped tag (non-null
///     <c>EquipmentId</c>) bound to a <c>GalaxyMxGateway</c> driver in an <c>Equipment</c>-kind namespace —
///     into the decoded <c>EquipmentTags</c> with byte-parity to the live-edit composer path: same FullName,
///     EquipmentId, DriverInstanceId, Name, DataType. Both data-contract sites gate purely on the namespace
///     Kind being <c>Equipment</c> (no Galaxy/DriverType exception — Galaxy is an ordinary Equipment-kind
///     driver), so they agree on which tags qualify.
/// </summary>
public sealed class DeploymentArtifactAliasParityTests
{
    /// <summary>An artifact JSON blob with a GalaxyMxGateway driver in an Equipment (Kind=0) namespace and
    /// one equipment-scoped tag (EquipmentId set, FolderPath null, FullName = the Galaxy ref). Decode must
    /// surface the tag in EquipmentTags carrying its driver-side FullName, coalescing the null FolderPath to
    /// <c>string.Empty</c>.</summary>
    [Fact]
    public void ParseComposition_admits_galaxy_equipment_tag_in_equipment_tags()
    {
        var blob = JsonSerializer.SerializeToUtf8Bytes(new
        {
            Namespaces = new[]
            {
                new { NamespaceId = "ns-eq", Kind = 0 }, // NamespaceKind.Equipment
            },
            DriverInstances = new[]
            {
                new { DriverInstanceId = "drv-galaxy", DriverType = "GalaxyMxGateway", DriverConfig = "{}", NamespaceId = "ns-eq" },
            },
            Tags = new object[]
            {
                new
                {
                    TagId = "tag-galaxy",
                    DriverInstanceId = "drv-galaxy",
                    EquipmentId = "eq-1",
                    Name = "TestChangingInt",
                    FolderPath = (string?)null,
                    DataType = "Int32",
                    TagConfig = "{\"FullName\":\"TestMachine_020.TestChangingInt\"}",
                },
            },
        });

        var c = DeploymentArtifact.ParseComposition(blob);

        var tag = c.EquipmentTags.ShouldHaveSingleItem();
        tag.TagId.ShouldBe("tag-galaxy");
        tag.EquipmentId.ShouldBe("eq-1");
        tag.DriverInstanceId.ShouldBe("drv-galaxy");
        tag.Name.ShouldBe("TestChangingInt");
        tag.DataType.ShouldBe("Int32");
        tag.FolderPath.ShouldBe(string.Empty);
        tag.FullName.ShouldBe("TestMachine_020.TestChangingInt");
        // No AccessLevel in the blob → defaults to non-writable (read-only node).
        tag.Writable.ShouldBeFalse();
    }

    /// <summary>The artifact decoder reads <c>AccessLevel</c> into <c>EquipmentTagPlan.Writable</c>:
    /// ReadWrite → true, Read → false. ConfigComposer emits the enum numerically (no string converter),
    /// so the numeric form (1 = ReadWrite) is the canonical wire shape, but the decoder also tolerates
    /// the string form ("ReadWrite") defensively — mirroring how the Kind gate accepts both.</summary>
    [Theory]
    [InlineData(1, true)]    // numeric ReadWrite
    [InlineData(0, false)]   // numeric Read
    [InlineData(2, false)]   // future/unknown AccessLevel maps fail-safe to read-only (only ReadWrite==1 ⇒ writable)
    public void ParseComposition_maps_numeric_AccessLevel_to_Writable(int accessLevel, bool expectedWritable)
    {
        var blob = JsonSerializer.SerializeToUtf8Bytes(new
        {
            Namespaces = new[] { new { NamespaceId = "ns-eq", Kind = 0 } },
            DriverInstances = new[]
            {
                new { DriverInstanceId = "drv", DriverType = "Modbus", DriverConfig = "{}", NamespaceId = "ns-eq" },
            },
            Tags = new object[]
            {
                new
                {
                    TagId = "tag-1",
                    DriverInstanceId = "drv",
                    EquipmentId = "eq-1",
                    Name = "Speed",
                    FolderPath = (string?)null,
                    DataType = "Float",
                    AccessLevel = accessLevel,
                    TagConfig = "{\"FullName\":\"40001\"}",
                },
            },
        });

        var c = DeploymentArtifact.ParseComposition(blob);

        c.EquipmentTags.ShouldHaveSingleItem().Writable.ShouldBe(expectedWritable);
    }

    /// <summary>The decoder also tolerates the string enum form ("ReadWrite"/"Read") in case a future
    /// serializer registers a string converter — byte-parity safety, mirroring the Kind gate.</summary>
    [Theory]
    [InlineData("ReadWrite", true)]
    [InlineData("Read", false)]
    public void ParseComposition_maps_string_AccessLevel_to_Writable(string accessLevel, bool expectedWritable)
    {
        var blob = JsonSerializer.SerializeToUtf8Bytes(new
        {
            Namespaces = new[] { new { NamespaceId = "ns-eq", Kind = 0 } },
            DriverInstances = new[]
            {
                new { DriverInstanceId = "drv", DriverType = "Modbus", DriverConfig = "{}", NamespaceId = "ns-eq" },
            },
            Tags = new object[]
            {
                new
                {
                    TagId = "tag-1",
                    DriverInstanceId = "drv",
                    EquipmentId = "eq-1",
                    Name = "Speed",
                    FolderPath = (string?)null,
                    DataType = "Float",
                    AccessLevel = accessLevel,
                    TagConfig = "{\"FullName\":\"40001\"}",
                },
            },
        });

        var c = DeploymentArtifact.ParseComposition(blob);

        c.EquipmentTags.ShouldHaveSingleItem().Writable.ShouldBe(expectedWritable);
    }

    /// <summary>An equipment-scoped tag in a non-Equipment (Simulated) namespace must NOT surface in
    /// EquipmentTags — byte-parity with the composer's pure <c>ns.Kind == NamespaceKind.Equipment</c>
    /// predicate. The gate keys off the namespace Kind alone, with no DriverType exception, so a
    /// non-Equipment namespace excludes the tag regardless of driver type.</summary>
    [Fact]
    public void ParseComposition_excludes_tag_in_non_equipment_namespace()
    {
        var blob = JsonSerializer.SerializeToUtf8Bytes(new
        {
            Namespaces = new[]
            {
                new { NamespaceId = "ns-sim", Kind = 1 }, // NamespaceKind.Simulated (non-Equipment)
            },
            DriverInstances = new[]
            {
                new { DriverInstanceId = "drv-sim", DriverType = "Modbus", DriverConfig = "{}", NamespaceId = "ns-sim" },
            },
            Tags = new object[]
            {
                new
                {
                    TagId = "tag-x",
                    DriverInstanceId = "drv-sim",
                    EquipmentId = "eq-1",
                    Name = "Source",
                    FolderPath = (string?)null,
                    DataType = "Int32",
                    TagConfig = "{\"FullName\":\"40001\"}",
                },
            },
        });

        var c = DeploymentArtifact.ParseComposition(blob);

        c.EquipmentTags.ShouldBeEmpty();
    }

    /// <summary>
    ///     The load-bearing direct byte-parity proof for the two equipment-tag producers: for the SAME
    ///     input draft, the live-edit composer (<see cref="Phase7Composer.Compose"/>) and the
    ///     artifact decoder (<see cref="DeploymentArtifact.ParseComposition(System.ReadOnlySpan{byte})"/>)
    ///     must emit IDENTICAL <c>EquipmentTags</c> — element-wise equal on every field
    ///     (TagId, EquipmentId, DriverInstanceId, FolderPath, Name, DataType, FullName) AND in the same
    ///     ORDER. The draft holds a Galaxy equipment tag (EquipmentId set, GalaxyMxGateway driver in an
    ///     Equipment-kind namespace, TagConfig <c>{"FullName":"DelmiaReceiver_001.DownloadPath"}</c>)
    ///     PLUS a Modbus equipment tag, so the parity is proven both for Galaxy specifically and across
    ///     drivers — Galaxy is now an ordinary Equipment-kind driver with no exception clause on either
    ///     side. Both sides sort by EquipmentId → FolderPath → Name (Ordinal), so identical input yields
    ///     identical order. <c>EquipmentTagPlan</c> is a plain positional record (all string members), so
    ///     <c>SequenceEqual</c> is full value-and-order equality.
    /// </summary>
    [Fact]
    public void Composer_and_artifact_agree_on_galaxy_equipment_tag()
    {
        // ---- The ONE input draft both producers consume ----
        // Equipment-kind namespace shared by both drivers (the qualifying gate on both sides).
        var ns = new Namespace
        {
            NamespaceId = "ns-eq",
            ClusterId = "c1",
            Kind = NamespaceKind.Equipment,
            NamespaceUri = "urn:eq",
        };
        // Galaxy is a standard Equipment-kind driver now — no driver-type exception on either side.
        var galaxyDriver = new DriverInstance
        {
            DriverInstanceId = "drv-galaxy",
            ClusterId = "c1",
            NamespaceId = "ns-eq",
            Name = "Galaxy1",
            DriverType = "GalaxyMxGateway",
            DriverConfig = "{}",
        };
        var modbusDriver = new DriverInstance
        {
            DriverInstanceId = "drv-modbus",
            ClusterId = "c1",
            NamespaceId = "ns-eq",
            Name = "Modbus1",
            DriverType = "Modbus",
            DriverConfig = "{}",
        };
        var area = new UnsArea { UnsAreaId = "area-1", ClusterId = "c1", Name = "filling" };
        var line = new UnsLine { UnsLineId = "line-1", UnsAreaId = "area-1", Name = "line-1" };
        var galaxyEquip = new Equipment
        {
            EquipmentId = "eq-galaxy",
            DriverInstanceId = "drv-galaxy",
            UnsLineId = "line-1",
            Name = "DelmiaReceiver",
            MachineCode = "DELMIARECEIVER",
        };
        var modbusEquip = new Equipment
        {
            EquipmentId = "eq-modbus",
            DriverInstanceId = "drv-modbus",
            UnsLineId = "line-1",
            Name = "FillingPump",
            MachineCode = "FILLINGPUMP",
        };

        // The Galaxy equipment tag — FullName is the Galaxy ref "tag_name.AttributeName".
        // It also carries a native-alarm intent in TagConfig.alarm, so this draft proves the
        // optional Alarm field is parsed byte-identically on both producers (Phase B WS-2).
        var galaxyTag = new Tag
        {
            TagId = "tag-galaxy",
            DriverInstanceId = "drv-galaxy",
            EquipmentId = "eq-galaxy",
            FolderPath = null, // coalesces to "" on both sides
            Name = "DownloadPath",
            DataType = "String",
            AccessLevel = TagAccessLevel.Read,
            TagConfig = "{\"FullName\":\"DelmiaReceiver_001.DownloadPath\",\"alarm\":{\"alarmType\":\"OffNormalAlarm\",\"severity\":700}}",
        };
        // A non-Galaxy (Modbus) equipment tag — proves the parity holds across drivers, not just Galaxy.
        var modbusTag = new Tag
        {
            TagId = "tag-modbus",
            DriverInstanceId = "drv-modbus",
            EquipmentId = "eq-modbus",
            FolderPath = "registers",
            Name = "Speed",
            DataType = "Float",
            AccessLevel = TagAccessLevel.ReadWrite,
            TagConfig = "{\"FullName\":\"40001\"}",
        };

        var areas = new[] { area };
        var lines = new[] { line };
        var equipment = new[] { galaxyEquip, modbusEquip };
        var drivers = new[] { galaxyDriver, modbusDriver };
        var tags = new[] { galaxyTag, modbusTag };
        var namespaces = new[] { ns };

        // ---- Side 1: the live-edit composer ----
        var composed = Phase7Composer.Compose(
            areas, lines, equipment, drivers, Array.Empty<ScriptedAlarm>(), tags, namespaces);

        // ---- Side 2: serialise the SAME draft to the artifact blob shape ConfigComposer emits
        //              (Pascal-case off the EF entities), then decode it. ----
        var blob = JsonSerializer.SerializeToUtf8Bytes(new
        {
            Namespaces = new[]
            {
                new { ns.NamespaceId, ns.ClusterId, Kind = (int)ns.Kind },
            },
            DriverInstances = new[]
            {
                new { galaxyDriver.DriverInstanceId, galaxyDriver.DriverType, galaxyDriver.DriverConfig, galaxyDriver.NamespaceId, galaxyDriver.ClusterId },
                new { modbusDriver.DriverInstanceId, modbusDriver.DriverType, modbusDriver.DriverConfig, modbusDriver.NamespaceId, modbusDriver.ClusterId },
            },
            Tags = new[]
            {
                ToSnapshot(galaxyTag),
                ToSnapshot(modbusTag),
            },
        });

        var decoded = DeploymentArtifact.ParseComposition(blob);

        // ---- The equality contract: element-wise equal on ALL fields + same order ----
        decoded.EquipmentTags.Count.ShouldBe(2);
        // SequenceEqual = full value-and-order equality (EquipmentTagPlan is a positional record).
        decoded.EquipmentTags.SequenceEqual(composed.EquipmentTags).ShouldBeTrue();

        // Spell the per-field contract out too (so a future divergence names the offending field
        // rather than just "sequences differ"), and pin the Galaxy tag's wire-level FullName.
        foreach (var (d, x) in decoded.EquipmentTags.Zip(composed.EquipmentTags))
        {
            d.TagId.ShouldBe(x.TagId);
            d.EquipmentId.ShouldBe(x.EquipmentId);
            d.DriverInstanceId.ShouldBe(x.DriverInstanceId);
            d.FolderPath.ShouldBe(x.FolderPath);
            d.Name.ShouldBe(x.Name);
            d.DataType.ShouldBe(x.DataType);
            d.FullName.ShouldBe(x.FullName);
            d.Writable.ShouldBe(x.Writable);
            d.Alarm.ShouldBe(x.Alarm); // EquipmentTagAlarmInfo is a positional record ⇒ value equality
        }

        var galaxyPlan = decoded.EquipmentTags.Single(t => t.TagId == "tag-galaxy");
        galaxyPlan.FullName.ShouldBe("DelmiaReceiver_001.DownloadPath");
        galaxyPlan.EquipmentId.ShouldBe("eq-galaxy");
        galaxyPlan.DriverInstanceId.ShouldBe("drv-galaxy");
        galaxyPlan.FolderPath.ShouldBe(string.Empty); // null FolderPath coalesced identically on both sides

        // The native-alarm intent in the Galaxy tag's TagConfig.alarm is parsed byte-identically on both
        // producers (Phase B WS-2). The Modbus tag has no alarm object ⇒ null Alarm on both sides.
        galaxyPlan.Alarm.ShouldNotBeNull();
        galaxyPlan.Alarm!.AlarmType.ShouldBe("OffNormalAlarm");
        galaxyPlan.Alarm.Severity.ShouldBe(700);
        composed.EquipmentTags.Single(t => t.TagId == "tag-galaxy").Alarm.ShouldBe(galaxyPlan.Alarm);
        decoded.EquipmentTags.Single(t => t.TagId == "tag-modbus").Alarm.ShouldBeNull();
        composed.EquipmentTags.Single(t => t.TagId == "tag-modbus").Alarm.ShouldBeNull();

        // Writability flows from Tag.AccessLevel: the Galaxy tag is Read (read-only node), the Modbus
        // tag is ReadWrite (writable node). Both producers must derive the same Writable flag, and the
        // SequenceEqual above already proves they agree element-wise.
        galaxyPlan.Writable.ShouldBeFalse(); // AccessLevel = Read
        var modbusPlan = decoded.EquipmentTags.Single(t => t.TagId == "tag-modbus");
        modbusPlan.Writable.ShouldBeTrue(); // AccessLevel = ReadWrite
        composed.EquipmentTags.Single(t => t.TagId == "tag-galaxy").Writable.ShouldBeFalse();
        composed.EquipmentTags.Single(t => t.TagId == "tag-modbus").Writable.ShouldBeTrue();
    }

    /// <summary>The full Pascal-case snapshot a <see cref="Tag"/> EF entity serialises to in the
    /// artifact (matches ConfigComposer): the equipment-tag decoder reads exactly these fields.</summary>
    private static object ToSnapshot(Tag t) => new
    {
        t.TagId,
        t.DriverInstanceId,
        t.EquipmentId,
        t.Name,
        t.FolderPath,
        t.DataType,
        // ConfigComposer serialises with no JsonStringEnumConverter, so the TagAccessLevel enum lands
        // as its numeric value (Read = 0, ReadWrite = 1) — exactly like Kind = (int)ns.Kind above.
        AccessLevel = (int)t.AccessLevel,
        t.TagConfig,
    };
}