using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.AdminUI.Uns;
using ZB.MOM.WW.OtOpcUa.Configuration.Entities;

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

/// <summary>
/// Verifies the bulk <see cref="UnsTreeService.ImportEquipmentAsync"/> path: valid rows insert, rows
/// whose MachineCode already exists (in the DB or earlier in the same batch) are skipped, and rows
/// referencing an unknown UNS line are reported as errors. (v3: equipment no longer binds a driver, so
/// the old DriverInstanceId column and its decision-#122 cluster guard — and their tests — are gone.)
/// </summary>
[Trait("Category", "Unit")]
public sealed class UnsTreeServiceImportTests
{
    private static (UnsTreeService Service, string DbName) Fresh()
    {
        var dbName = $"uns-import-{Guid.NewGuid():N}";
        return (new UnsTreeService(UnsTreeTestDb.Factory(dbName)), dbName);
    }

    /// <summary>Seeds an area → line (id <c>LINE-1</c>) under <paramref name="cluster"/>.</summary>
    private static void SeedLine(string dbName, string cluster)
    {
        using var db = UnsTreeTestDb.CreateNamed(dbName);
        db.UnsAreas.Add(new UnsArea { UnsAreaId = "AREA-1", ClusterId = cluster, Name = "a" });
        db.UnsLines.Add(new UnsLine { UnsLineId = "LINE-1", UnsAreaId = "AREA-1", Name = "l" });
        db.SaveChanges();
    }

    private static EquipmentInput Input(string name, string machineCode, string unsLineId) =>
        new(name, machineCode, unsLineId,
            ZTag: null, SAPID: null, Manufacturer: null, Model: null, SerialNumber: null,
            HardwareRevision: null, SoftwareRevision: null, YearOfConstruction: null,
            AssetLocation: null, ManufacturerUri: null, DeviceManualUri: null, Enabled: true);

    /// <summary>Valid rows insert with system-generated EQ- ids and are counted in <c>Inserted</c>.</summary>
    [Fact]
    public async Task Import_inserts_valid_rows()
    {
        var (service, dbName) = Fresh();
        SeedLine(dbName, "MAIN");

        var result = await service.ImportEquipmentAsync(
        [
            Input("machine-1", "mc_1", "LINE-1"),
            Input("machine-2", "mc_2", "LINE-1"),
        ]);

        result.Inserted.ShouldBe(2);
        result.Skipped.ShouldBe(0);
        result.Errors.ShouldBeEmpty();

        using var db = UnsTreeTestDb.CreateNamed(dbName);
        db.Equipment.Count().ShouldBe(2);
        var eq = db.Equipment.Single(e => e.MachineCode == "mc_1");
        eq.EquipmentId.ShouldStartWith("EQ-");
        eq.EquipmentId.Length.ShouldBe(15); // "EQ-" + 12 hex chars
        eq.Name.ShouldBe("machine-1");
        eq.UnsLineId.ShouldBe("LINE-1");
        eq.Enabled.ShouldBeTrue();
    }

    /// <summary>
    /// A row whose MachineCode already exists in the DB is skipped (not an error), and a second row
    /// later in the batch that reuses an earlier row's MachineCode is also skipped.
    /// </summary>
    [Fact]
    public async Task Import_skips_duplicate_machinecode()
    {
        var (service, dbName) = Fresh();
        SeedLine(dbName, "MAIN");
        // Pre-existing equipment with MachineCode "mc_existing".
        await service.CreateEquipmentAsync(Input("machine-x", "mc_existing", "LINE-1"));

        var result = await service.ImportEquipmentAsync(
        [
            Input("machine-1", "mc_existing", "LINE-1"), // dup of DB row → skip
            Input("machine-2", "mc_new", "LINE-1"),      // inserts
            Input("machine-3", "mc_new", "LINE-1"),      // dup of in-batch row → skip
        ]);

        result.Inserted.ShouldBe(1);
        result.Skipped.ShouldBe(2);
        result.Errors.ShouldBeEmpty();

        using var db = UnsTreeTestDb.CreateNamed(dbName);
        db.Equipment.Count(e => e.MachineCode == "mc_new").ShouldBe(1);
        db.Equipment.Count(e => e.MachineCode == "mc_existing").ShouldBe(1);
    }

    /// <summary>A row whose UnsLineId does not exist is reported as an error and not inserted.</summary>
    [Fact]
    public async Task Import_reports_unknown_line()
    {
        var (service, dbName) = Fresh();
        SeedLine(dbName, "MAIN");

        var result = await service.ImportEquipmentAsync(
        [
            Input("machine-1", "mc_1", "LINE-BOGUS"),
            Input("machine-2", "mc_2", "LINE-1"),
        ]);

        result.Inserted.ShouldBe(1);
        result.Skipped.ShouldBe(0);
        result.Errors.Count.ShouldBe(1);
        result.Errors[0].ShouldContain("mc_1");
        result.Errors[0].ShouldContain("LINE-BOGUS");

        using var db = UnsTreeTestDb.CreateNamed(dbName);
        db.Equipment.Any(e => e.MachineCode == "mc_1").ShouldBeFalse();
        db.Equipment.Any(e => e.MachineCode == "mc_2").ShouldBeTrue();
    }
}