using Microsoft.EntityFrameworkCore;
using ScadaLink.Commons.Entities.Notifications;
using ScadaLink.Commons.Types.Enums;
using ScadaLink.ConfigurationDatabase;
using ScadaLink.ConfigurationDatabase.Repositories;

namespace ScadaLink.ConfigurationDatabase.Tests;

// Coverage for per-site KPI aggregation in the Notification Outbox repository
// (Task 2 of the notifications-nav-group feature).
public class NotificationOutboxRepositoryPerSiteKpiTests
{
    private static ScadaLinkDbContext NewContext() => SqliteTestHelper.CreateInMemoryContext();

    private static Notification NewNotification(
        string sourceSiteId,
        NotificationStatus status,
        DateTimeOffset createdAt,
        DateTimeOffset? deliveredAt = null)
    {
        return new Notification(
            Guid.NewGuid().ToString(), NotificationType.Email, "Ops List", "Subject", "Body", sourceSiteId)
        {
            Status = status,
            CreatedAt = createdAt,
            DeliveredAt = deliveredAt,
        };
    }

    [Fact]
    public async Task ComputePerSiteKpisAsync_AggregatesMetricsPerSite()
    {
        await using var ctx = NewContext();
        var now = DateTimeOffset.UtcNow;

        // plant-a: 1 pending (stuck, created 20m ago), 1 parked
        ctx.Notifications.Add(NewNotification("plant-a", NotificationStatus.Pending, createdAt: now.AddMinutes(-20)));
        ctx.Notifications.Add(NewNotification("plant-a", NotificationStatus.Parked, createdAt: now.AddMinutes(-5)));
        // plant-b: 1 delivered in-window, 1 pending (fresh)
        ctx.Notifications.Add(NewNotification("plant-b", NotificationStatus.Delivered, createdAt: now.AddHours(-2), deliveredAt: now.AddMinutes(-2)));
        ctx.Notifications.Add(NewNotification("plant-b", NotificationStatus.Pending, createdAt: now.AddMinutes(-1)));
        await ctx.SaveChangesAsync();

        var repo = new NotificationOutboxRepository(ctx);
        var result = await repo.ComputePerSiteKpisAsync(
            stuckCutoff: now.AddMinutes(-10), deliveredSince: now.AddMinutes(-30));

        var a = result.Single(s => s.SourceSiteId == "plant-a");
        Assert.Equal(1, a.QueueDepth);
        Assert.Equal(1, a.StuckCount);
        Assert.Equal(1, a.ParkedCount);
        Assert.Equal(0, a.DeliveredLastInterval);
        Assert.NotNull(a.OldestPendingAge);

        var b = result.Single(s => s.SourceSiteId == "plant-b");
        Assert.Equal(1, b.QueueDepth);
        Assert.Equal(0, b.StuckCount);
        Assert.Equal(1, b.DeliveredLastInterval);
    }

    [Fact]
    public async Task ComputePerSiteKpisAsync_ReturnsEmpty_WhenNoNotifications()
    {
        await using var ctx = NewContext();
        var repo = new NotificationOutboxRepository(ctx);
        var result = await repo.ComputePerSiteKpisAsync(
            DateTimeOffset.UtcNow, DateTimeOffset.UtcNow.AddMinutes(-30));
        Assert.Empty(result);
    }
}