using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Configuration.Entities;
using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
using ZB.MOM.WW.OtOpcUa.Core.Authorization;
using ZB.MOM.WW.OtOpcUa.Core.OpcUa;
using ZB.MOM.WW.OtOpcUa.Server.Security;

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

/// <summary>
///     Unit tests for <see cref="ScopePathIndexBuilder"/> — the ADR-001 Task B builder that
///     produces the full-path <see cref="NodeScope"/> index consumed by
///     <see cref="NodeScopeResolver"/> in its indexed mode.
/// </summary>
[Trait("Category", "Unit")]
public sealed class ScopePathIndexBuilderTests
{
    [Fact]
    public void Build_emits_full_hierarchy_for_well_formed_content()
    {
        var index = ScopePathIndexBuilder.Build("c1", "ns-eq", Content(
            areas: [Area("area1")],
            lines: [Line("line1", "area1")],
            equipment: [Equip("eq1", "line1")],
            tags: [TagRow("tag1", "eq1", tagConfig: "Eq1/Speed")]));

        index.Count.ShouldBe(1);
        var scope = index["Eq1/Speed"];
        scope.ClusterId.ShouldBe("c1");
        scope.NamespaceId.ShouldBe("ns-eq");
        scope.UnsAreaId.ShouldBe("area1");
        scope.UnsLineId.ShouldBe("line1");
        scope.EquipmentId.ShouldBe("eq1");
        scope.TagId.ShouldBe("Eq1/Speed");
        scope.Kind.ShouldBe(NodeHierarchyKind.Equipment);
    }

    [Fact]
    public void Build_skips_tags_with_null_EquipmentId()
    {
        // SystemPlatform-namespace tags (decision #110) — the cluster-only resolver
        // fallback handles them; no index entry needed.
        var index = ScopePathIndexBuilder.Build("c1", "ns-sp", Content(
            tags: [TagRow("t", equipmentId: null, tagConfig: "Galaxy.Object.Attr")]));

        index.Count.ShouldBe(0);
    }

    [Fact]
    public void Build_skips_tags_with_broken_Equipment_FK()
    {
        // Tag references a missing Equipment row. sp_ValidateDraft should have caught this
        // at publish; builder skips rather than crashes so startup stays bootable.
        var index = ScopePathIndexBuilder.Build("c1", "ns", Content(
            areas: [Area("area1")],
            lines: [Line("line1", "area1")],
            tags: [TagRow("t", "missing-eq", "missing/Speed")]));

        index.Count.ShouldBe(0);
    }

    [Fact]
    public void Build_skips_equipment_with_broken_line_FK()
    {
        var index = ScopePathIndexBuilder.Build("c1", "ns", Content(
            areas: [Area("area1")],
            lines: [], // no lines — equipment's UnsLineId misses
            equipment: [Equip("eq1", "missing")],
            tags: [TagRow("t", "eq1", "E/S")]));

        index.Count.ShouldBe(0);
    }

    [Fact]
    public void Build_throws_on_duplicate_TagConfig()
    {
        var ex = Should.Throw<InvalidOperationException>(() =>
            ScopePathIndexBuilder.Build("c1", "ns", Content(
                areas: [Area("area1")],
                lines: [Line("line1", "area1")],
                equipment: [Equip("eq1", "line1")],
                tags:
                [
                    TagRow("t1", "eq1", "E/DUP"),
                    TagRow("t2", "eq1", "E/DUP"),
                ])));

        ex.Message.ShouldContain("Duplicate");
        ex.Message.ShouldContain("E/DUP");
    }

    [Fact]
    public void Resolver_with_index_returns_full_path_scope()
    {
        var index = ScopePathIndexBuilder.Build("c1", "ns", Content(
            areas: [Area("area1")],
            lines: [Line("line1", "area1")],
            equipment: [Equip("eq1", "line1")],
            tags: [TagRow("t", "eq1", "E/Speed")]));
        var resolver = new NodeScopeResolver("c1", index);

        var resolved = resolver.Resolve("E/Speed");
        resolved.UnsAreaId.ShouldBe("area1");
        resolved.UnsLineId.ShouldBe("line1");
        resolved.EquipmentId.ShouldBe("eq1");

        // Un-indexed ref falls through to cluster-only scope — pre-ADR-001 behaviour preserved.
        var fallback = resolver.Resolve("Galaxy.Object.Attr");
        fallback.ClusterId.ShouldBe("c1");
        fallback.TagId.ShouldBe("Galaxy.Object.Attr");
        fallback.UnsAreaId.ShouldBeNull();
    }

    // ---- fixture helpers ---------------------------------------------------

    private static EquipmentNamespaceContent Content(
        IReadOnlyList<UnsArea>? areas = null,
        IReadOnlyList<UnsLine>? lines = null,
        IReadOnlyList<Equipment>? equipment = null,
        IReadOnlyList<Tag>? tags = null) =>
        new(areas ?? [], lines ?? [], equipment ?? [], tags ?? []);

    private static UnsArea Area(string id) => new()
    {
        UnsAreaId = id, ClusterId = "c1", Name = $"Area {id}",
    };

    private static UnsLine Line(string id, string areaId) => new()
    {
        UnsLineId = id, UnsAreaId = areaId, Name = $"Line {id}",
    };

    private static Equipment Equip(string id, string lineId) => new()
    {
        EquipmentId = id, UnsLineId = lineId, DriverInstanceId = "drv",
        Name = $"Eq {id}", MachineCode = $"M{id}", ZTag = id,
    };

    private static Tag TagRow(string id, string? equipmentId, string tagConfig) => new()
    {
        TagId = id, EquipmentId = equipmentId,
        DriverInstanceId = "drv",
        Name = id, DataType = "Int32",
        AccessLevel = TagAccessLevel.ReadWrite,
        TagConfig = tagConfig,
    };
}