using ZB.MOM.WW.GalaxyRepository;
using ZB.MOM.WW.GalaxyRepository.Grpc;
using ZB.MOM.WW.MxGateway.Server.Dashboard;

namespace ZB.MOM.WW.MxGateway.Tests.Gateway.Dashboard;

/// <summary>
///     Unit tests for <see cref="DashboardGalaxySummaryProjector"/>, the host-side
///     projection that turns a shared-library <see cref="GalaxyHierarchyCacheEntry"/>
///     into the dashboard's <see cref="DashboardGalaxySummary"/>.
/// </summary>
public sealed class DashboardGalaxySummaryProjectorTests
{
    /// <summary>
    ///     Verifies that a healthy entry maps status, copies timestamps/counts, and
    ///     groups objects into template usage (ordered by instance count) and
    ///     category counts with resolved names.
    /// </summary>
    [Fact]
    public void Project_HealthyEntry_MapsStatusCopiesCountsAndGroupsObjects()
    {
        DateTimeOffset queriedAt = new(2026, 6, 25, 10, 0, 0, TimeSpan.Zero);
        DateTimeOffset successAt = new(2026, 6, 25, 10, 0, 1, TimeSpan.Zero);
        DateTimeOffset deployAt = new(2026, 6, 24, 8, 30, 0, TimeSpan.Zero);

        // Two templates (PumpTemplate x2, ValveTemplate x1) and two categories
        // (10 = UserDefined x3, 13 = Area x1).
        GalaxyObject area = new()
        {
            GobjectId = 1,
            BrowseName = "AreaA",
            IsArea = true,
            CategoryId = 13,
        };
        GalaxyObject pumpA = new()
        {
            GobjectId = 2,
            BrowseName = "Pump01",
            CategoryId = 10,
        };
        pumpA.TemplateChain.Add("$PumpTemplate");
        GalaxyObject pumpB = new()
        {
            GobjectId = 3,
            BrowseName = "Pump02",
            CategoryId = 10,
        };
        pumpB.TemplateChain.Add("$PumpTemplate");
        GalaxyObject valve = new()
        {
            GobjectId = 4,
            BrowseName = "Valve01",
            CategoryId = 10,
        };
        valve.TemplateChain.Add("$ValveTemplate");

        GalaxyObject[] objects = [area, pumpA, pumpB, valve];

        GalaxyHierarchyCacheEntry entry = new(
            Status: GalaxyCacheStatus.Healthy,
            Sequence: 7,
            LastQueriedAt: queriedAt,
            LastSuccessAt: successAt,
            LastDeployTime: deployAt,
            LastError: null,
            Objects: objects,
            Index: GalaxyHierarchyIndex.Build(objects),
            ObjectCount: 4,
            AreaCount: 1,
            AttributeCount: 12,
            HistorizedAttributeCount: 5,
            AlarmAttributeCount: 2);

        DashboardGalaxySummary summary = DashboardGalaxySummaryProjector.Project(entry);

        Assert.Equal(DashboardGalaxyStatus.Healthy, summary.Status);
        Assert.Equal(queriedAt, summary.LastQueriedAt);
        Assert.Equal(successAt, summary.LastSuccessAt);
        Assert.Equal(deployAt, summary.LastDeployTime);
        Assert.Null(summary.LastError);
        Assert.Equal(4, summary.ObjectCount);
        Assert.Equal(1, summary.AreaCount);
        Assert.Equal(12, summary.AttributeCount);
        Assert.Equal(5, summary.HistorizedAttributeCount);
        Assert.Equal(2, summary.AlarmAttributeCount);

        // Templates ordered by instance count descending: PumpTemplate (2) before ValveTemplate (1).
        Assert.Equal(2, summary.TopTemplates.Count);
        Assert.Equal("$PumpTemplate", summary.TopTemplates[0].TemplateName);
        Assert.Equal(2, summary.TopTemplates[0].InstanceCount);
        Assert.Equal("$ValveTemplate", summary.TopTemplates[1].TemplateName);
        Assert.Equal(1, summary.TopTemplates[1].InstanceCount);

        // Categories ordered by object count descending: UserDefined (3) before Area (1).
        Assert.Equal(2, summary.ObjectCategories.Count);
        Assert.Equal(10, summary.ObjectCategories[0].CategoryId);
        Assert.Equal("UserDefined", summary.ObjectCategories[0].CategoryName);
        Assert.Equal(3, summary.ObjectCategories[0].ObjectCount);
        Assert.Equal(13, summary.ObjectCategories[1].CategoryId);
        Assert.Equal("Area", summary.ObjectCategories[1].CategoryName);
        Assert.Equal(1, summary.ObjectCategories[1].ObjectCount);
    }

    /// <summary>
    ///     Verifies that an unknown entry with no objects projects to the
    ///     <see cref="DashboardGalaxySummary.Unknown"/>-equivalent summary.
    /// </summary>
    [Fact]
    public void Project_UnknownEmptyEntry_ProducesUnknownEquivalentSummary()
    {
        GalaxyHierarchyCacheEntry entry = GalaxyHierarchyCacheEntry.Empty;

        DashboardGalaxySummary summary = DashboardGalaxySummaryProjector.Project(entry);

        Assert.Equal(DashboardGalaxyStatus.Unknown, summary.Status);
        Assert.Null(summary.LastQueriedAt);
        Assert.Null(summary.LastSuccessAt);
        Assert.Null(summary.LastDeployTime);
        Assert.Null(summary.LastError);
        Assert.Equal(0, summary.ObjectCount);
        Assert.Equal(0, summary.AreaCount);
        Assert.Equal(0, summary.AttributeCount);
        Assert.Equal(0, summary.HistorizedAttributeCount);
        Assert.Equal(0, summary.AlarmAttributeCount);
        Assert.Empty(summary.TopTemplates);
        Assert.Empty(summary.ObjectCategories);
    }

    /// <summary>
    ///     Verifies that the cache status enum is faithfully mapped to the dashboard
    ///     status enum across every defined value.
    /// </summary>
    [Theory]
    [InlineData(GalaxyCacheStatus.Healthy, DashboardGalaxyStatus.Healthy)]
    [InlineData(GalaxyCacheStatus.Stale, DashboardGalaxyStatus.Stale)]
    [InlineData(GalaxyCacheStatus.Unavailable, DashboardGalaxyStatus.Unavailable)]
    [InlineData(GalaxyCacheStatus.Unknown, DashboardGalaxyStatus.Unknown)]
    public void Project_MapsCacheStatusToDashboardStatus(
        GalaxyCacheStatus cacheStatus,
        DashboardGalaxyStatus expected)
    {
        GalaxyHierarchyCacheEntry entry = GalaxyHierarchyCacheEntry.Empty with { Status = cacheStatus };

        DashboardGalaxySummary summary = DashboardGalaxySummaryProjector.Project(entry);

        Assert.Equal(expected, summary.Status);
    }
}