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

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

/// <summary>
/// Verifies the load-for-edit projections on <see cref="UnsTreeService"/> that prefill the
/// Area/Line/Equipment edit modals and carry the concurrency token back for last-write-wins saves.
/// </summary>
[Trait("Category", "Unit")]
public sealed class UnsTreeServiceLoadEditTests
{
    private static (UnsTreeService Service, string DbName) Seeded()
    {
        var dbName = $"uns-loadedit-{Guid.NewGuid():N}";
        UnsTreeTestDb.SeedNamed(dbName);
        return (new UnsTreeService(UnsTreeTestDb.Factory(dbName)), dbName);
    }

    /// <summary>Loading a seeded area maps its fields, owning cluster, and a non-empty RowVersion.</summary>
    [Fact]
    public async Task LoadArea_returns_dto()
    {
        var (service, _) = Seeded();

        var dto = await service.LoadAreaAsync("AREA-1");

        dto.ShouldNotBeNull();
        dto.UnsAreaId.ShouldBe("AREA-1");
        dto.Name.ShouldBe("assembly");
        dto.ClusterId.ShouldBe(UnsTreeTestDb.PopulatedClusterId);
        dto.RowVersion.ShouldNotBeNull();
    }

    /// <summary>Loading a missing area returns null.</summary>
    [Fact]
    public async Task LoadArea_missing_returns_null()
    {
        var (service, _) = Seeded();

        (await service.LoadAreaAsync("NOPE")).ShouldBeNull();
    }

    /// <summary>Loading a seeded line maps its fields, parent area, and a non-empty RowVersion.</summary>
    [Fact]
    public async Task LoadLine_returns_dto()
    {
        var (service, _) = Seeded();

        var dto = await service.LoadLineAsync("LINE-1");

        dto.ShouldNotBeNull();
        dto.UnsLineId.ShouldBe("LINE-1");
        dto.UnsAreaId.ShouldBe("AREA-1");
        dto.Name.ShouldBe("line-a");
        dto.RowVersion.ShouldNotBeNull();
    }

    /// <summary>Loading a missing line returns null.</summary>
    [Fact]
    public async Task LoadLine_missing_returns_null()
    {
        var (service, _) = Seeded();

        (await service.LoadLineAsync("NOPE")).ShouldBeNull();
    }

    /// <summary>Loading the seeded equipment maps its identity fields, line, and a non-empty RowVersion.</summary>
    [Fact]
    public async Task LoadEquipment_returns_dto()
    {
        var (service, _) = Seeded();

        var dto = await service.LoadEquipmentAsync(UnsTreeTestDb.SeededEquipmentId);

        dto.ShouldNotBeNull();
        dto.EquipmentId.ShouldBe(UnsTreeTestDb.SeededEquipmentId);
        dto.Name.ShouldBe("machine-1");
        dto.MachineCode.ShouldBe("machine_001");
        dto.UnsLineId.ShouldBe("LINE-1");
        dto.RowVersion.ShouldNotBeNull();
    }

    /// <summary>Loading a missing equipment returns null.</summary>
    [Fact]
    public async Task LoadEquipment_missing_returns_null()
    {
        var (service, _) = Seeded();

        (await service.LoadEquipmentAsync("NOPE")).ShouldBeNull();
    }

    /// <summary>
    /// LoadDriversForCluster returns every driver in the cluster (any namespace kind), ordered by id,
    /// with the <c>"{Id} — {Name} ({DriverType})"</c> display; drivers in other clusters are excluded.
    /// </summary>
    [Fact]
    public async Task LoadDriversForCluster_returns_cluster_drivers()
    {
        var (service, dbName) = Seeded();

        await using (var db = UnsTreeTestDb.CreateNamed(dbName))
        {
            db.DriverInstances.Add(new DriverInstance
            {
                DriverInstanceId = "DRV-B",
                ClusterId = UnsTreeTestDb.PopulatedClusterId,
                NamespaceId = "NS-1",
                Name = "modbus-b",
                DriverType = "ModbusTcp",
                DriverConfig = "{}",
            });
            db.DriverInstances.Add(new DriverInstance
            {
                DriverInstanceId = "DRV-A",
                ClusterId = UnsTreeTestDb.PopulatedClusterId,
                NamespaceId = "NS-1",
                Name = "galaxy-a",
                DriverType = "Galaxy",
                DriverConfig = "{}",
            });
            // A driver in a different cluster must be excluded.
            db.DriverInstances.Add(new DriverInstance
            {
                DriverInstanceId = "DRV-OTHER",
                ClusterId = UnsTreeTestDb.EmptyClusterId,
                NamespaceId = "NS-2",
                Name = "other",
                DriverType = "S7",
                DriverConfig = "{}",
            });
            await db.SaveChangesAsync();
        }

        var drivers = await service.LoadDriversForClusterAsync(UnsTreeTestDb.PopulatedClusterId);

        drivers.Count.ShouldBe(2);
        drivers[0].DriverInstanceId.ShouldBe("DRV-A");
        drivers[0].Display.ShouldBe("DRV-A — galaxy-a (Galaxy)");
        drivers[1].DriverInstanceId.ShouldBe("DRV-B");
        drivers[1].Display.ShouldBe("DRV-B — modbus-b (ModbusTcp)");
    }

    /// <summary>Loading a seeded tag maps its fields, owning equipment, and a non-empty RowVersion.</summary>
    [Fact]
    public async Task LoadTag_returns_dto()
    {
        var (service, _) = Seeded();

        var dto = await service.LoadTagAsync("TAG-1");

        dto.ShouldNotBeNull();
        dto.TagId.ShouldBe("TAG-1");
        dto.EquipmentId.ShouldBe(UnsTreeTestDb.SeededEquipmentId);
        dto.Name.ShouldBe("speed");
        dto.DriverInstanceId.ShouldBe("DRV-1");
        dto.DataType.ShouldBe("Float");
        dto.AccessLevel.ShouldBe(TagAccessLevel.Read);
        dto.TagConfig.ShouldBe("{}");
        dto.RowVersion.ShouldNotBeNull();
    }

    /// <summary>Loading a missing tag returns null.</summary>
    [Fact]
    public async Task LoadTag_missing_returns_null()
    {
        var (service, _) = Seeded();

        (await service.LoadTagAsync("NOPE")).ShouldBeNull();
    }

    /// <summary>Loading a seeded virtual tag maps its fields, owning equipment, and a non-empty RowVersion.</summary>
    [Fact]
    public async Task LoadVirtualTag_returns_dto()
    {
        var (service, _) = Seeded();

        var dto = await service.LoadVirtualTagAsync("VTAG-1");

        dto.ShouldNotBeNull();
        dto.VirtualTagId.ShouldBe("VTAG-1");
        dto.EquipmentId.ShouldBe(UnsTreeTestDb.SeededEquipmentId);
        dto.Name.ShouldBe("computed");
        dto.DataType.ShouldBe("Double");
        dto.ScriptId.ShouldBe("SCRIPT-1");
        dto.RowVersion.ShouldNotBeNull();
    }

    /// <summary>Loading a missing virtual tag returns null.</summary>
    [Fact]
    public async Task LoadVirtualTag_missing_returns_null()
    {
        var (service, _) = Seeded();

        (await service.LoadVirtualTagAsync("NOPE")).ShouldBeNull();
    }
}