using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Admin.Services;

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

/// <summary>
///     Regression for Admin-012 — <c>admin-ui.md</c> ("Equipment CSV import", revised after
///     adversarial review finding #4) requires no <c>EquipmentId</c> column: it is
///     system-derived (<c>'EQ-' + first 12 hex chars of EquipmentUuid</c>) and "never
///     accepted from CSV imports". Operator-supplied EquipmentId would mint duplicate
///     equipment identity on typos.
/// </summary>
[Trait("Category", "Unit")]
public sealed class EquipmentCsvNoEquipmentIdColumnTests
{
    [Fact]
    public void RequiredColumns_does_not_include_EquipmentId()
    {
        EquipmentCsvImporter.RequiredColumns
            .ShouldNotContain("EquipmentId",
                customMessage: "Admin-012: admin-ui.md forbids an EquipmentId column on the CSV import — it is system-derived from EquipmentUuid.");
    }

    [Fact]
    public void OptionalColumns_does_not_include_EquipmentId()
    {
        EquipmentCsvImporter.OptionalColumns
            .ShouldNotContain("EquipmentId",
                customMessage: "Admin-012: EquipmentId must not be an optional column either — it is never accepted from the CSV.");
    }

    [Fact]
    public void EquipmentCsvRow_has_no_EquipmentId_property()
    {
        // The CSV row shape mirrors the accepted columns. Keeping EquipmentId on the
        // row would invite the same misuse — drop it so the type system prevents
        // accidental population from a future column.
        var prop = typeof(EquipmentCsvRow).GetProperty("EquipmentId");
        prop.ShouldBeNull("Admin-012: EquipmentCsvRow must not expose an EquipmentId — the value is derived at finalise time.");
    }

    [Fact]
    public void Header_with_EquipmentId_column_is_rejected_as_unknown()
    {
        // After the fix, EquipmentId is an unknown column — the header validator must
        // refuse it like any other unrecognised column so operators get an explicit
        // error rather than silently importing the value.
        const string csv =
            "# OtOpcUaCsv v1\n" +
            "ZTag,MachineCode,SAPID,EquipmentId,EquipmentUuid,Name,UnsAreaName,UnsLineName\n" +
            "z-1,MC,SAP,eq,uuid,Oven,Warsaw,Line1";

        var ex = Should.Throw<InvalidCsvFormatException>(() => EquipmentCsvImporter.Parse(csv));
        ex.Message.ShouldContain("EquipmentId",
            customMessage: "Importer must reject CSVs that still carry the (now disallowed) EquipmentId column.");
    }

    [Fact]
    public void Valid_csv_without_EquipmentId_is_accepted()
    {
        // The canonical header should now omit EquipmentId.
        const string csv =
            "# OtOpcUaCsv v1\n" +
            "ZTag,MachineCode,SAPID,EquipmentUuid,Name,UnsAreaName,UnsLineName\n" +
            "z-1,MC,SAP,11111111-2222-3333-4444-555555555555,Oven,Warsaw,Line1";

        var result = EquipmentCsvImporter.Parse(csv);
        result.AcceptedRows.Count.ShouldBe(1);
        result.RejectedRows.ShouldBeEmpty();
        result.AcceptedRows[0].ZTag.ShouldBe("z-1");
        result.AcceptedRows[0].EquipmentUuid.ShouldBe("11111111-2222-3333-4444-555555555555");
    }
}