feat(discovery): schedule saved-search alerts

JobTrackerApi.Tests/JobDiscoveryControllerTests.cs

@@ -3,6 +3,7 @@ using System.Net;
 using System.Text;
 using JobTrackerApi.Controllers;
 using JobTrackerApi.Data;
+using JobTrackerApi.Models;
 using JobTrackerApi.Services;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
@@ -25,7 +26,7 @@ public sealed class JobDiscoveryControllerTests
         var result = await controller.Search("backend", "oslo", CancellationToken.None);
 
         var ok = Assert.IsType<OkObjectResult>(result.Result);
-        var job = Assert.Single(Assert.IsAssignableFrom<IReadOnlyList<JobDiscoveryController.DiscoveredJob>>(ok.Value));
+        var job = Assert.Single(Assert.IsAssignableFrom<IReadOnlyList<DiscoveredJob>>(ok.Value));
         Assert.Equal("Backend Developer", job.Title);
         Assert.Equal("nav", job.Source);
         Assert.Equal("NAV Arbeidsplassen", job.SourceName);
@@ -46,7 +47,7 @@ public sealed class JobDiscoveryControllerTests
         var result = await controller.Search(null, null, CancellationToken.None);
 
         var ok = Assert.IsType<OkObjectResult>(result.Result);
-        var job = Assert.Single(Assert.IsAssignableFrom<IReadOnlyList<JobDiscoveryController.DiscoveredJob>>(ok.Value));
+        var job = Assert.Single(Assert.IsAssignableFrom<IReadOnlyList<DiscoveredJob>>(ok.Value));
         Assert.Equal("1", job.Id);
         Assert.Equal("Current title", job.Title);
     }
@@ -71,6 +72,8 @@ public sealed class JobDiscoveryControllerTests
         Assert.IsType<NoContentResult>(await controller.DismissSavedSearchResult(created.Id, "job-1", new(true), default));
         var listed = Assert.IsAssignableFrom<IReadOnlyList<JobDiscoveryController.SavedSearchDto>>(Assert.IsType<OkObjectResult>((await controller.ListSavedSearches(default)).Result).Value);
         Assert.Equal(1, Assert.Single(listed).DismissedCount);
+        var paused = Assert.IsType<JobDiscoveryController.SavedSearchDto>(Assert.IsType<OkObjectResult>((await controller.UpdateSavedSearch(created.Id, new(false), default)).Result).Value);
+        Assert.False(paused.IsActive);
     }
 
     private sealed class ClientFactory(HttpClient client) : IHttpClientFactory

JobTrackerApi.Tests/SavedJobSearchAlertTests.cs

@@ -0,0 +1,98 @@
+using JobTrackerApi.Data;
+using JobTrackerApi.Models;
+using JobTrackerApi.Services;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging.Abstractions;
+using Moq;
+using Xunit;
+
+namespace JobTrackerApi.Tests;
+
+public sealed class SavedJobSearchAlertTests
+{
+    [Fact]
+    public async Task Worker_establishes_baseline_then_notifies_only_for_later_results()
+    {
+        var clock = new MutableTimeProvider(new DateTimeOffset(2026, 8, 31, 8, 0, 0, TimeSpan.Zero));
+        var discovery = new FakeDiscovery(clock, "job-1");
+        var configuration = new ConfigurationBuilder().AddInMemoryCollection(new Dictionary<string, string?>
+        {
+            ["Workers:SavedJobSearchAlertsEnabled"] = "true",
+            ["JobDiscovery:SavedSearchIntervalHours"] = "6"
+        }).Build();
+        var services = new ServiceCollection();
+        var databaseName = Guid.NewGuid().ToString();
+        services.AddLogging();
+        services.AddHttpContextAccessor();
+        services.AddSingleton<IConfiguration>(configuration);
+        services.AddSingleton<TimeProvider>(clock);
+        services.AddSingleton<IJobDiscoverySearchService>(discovery);
+        services.AddScoped<CurrentUserService>();
+        services.AddScoped<ICurrentUserService>(provider => provider.GetRequiredService<CurrentUserService>());
+        services.AddDbContext<JobTrackerContext>((_, options) => options.UseInMemoryDatabase(databaseName));
+        services.AddScoped<SavedJobSearchRunner>();
+        services.AddSingleton<BackgroundTenantRunner>();
+        await using var provider = services.BuildServiceProvider();
+
+        await using (var scope = provider.CreateAsyncScope())
+        {
+            var db = scope.ServiceProvider.GetRequiredService<JobTrackerContext>();
+            db.SavedJobSearches.Add(new SavedJobSearch
+            {
+                OwnerUserId = "owner-without-jobs",
+                Name = "Backend Oslo",
+                Query = "backend",
+                Location = "Oslo",
+                CreatedAtUtc = clock.GetUtcNow(),
+                UpdatedAtUtc = clock.GetUtcNow()
+            });
+            await db.SaveChangesAsync();
+        }
+
+        var worker = new SavedJobSearchAlertHostedService(
+            provider.GetRequiredService<BackgroundTenantRunner>(),
+            configuration,
+            NullLogger<SavedJobSearchAlertHostedService>.Instance,
+            Mock.Of<IStartupReadiness>(),
+            clock);
+
+        Assert.Equal(new BackgroundWorkerRunResult(true, 1, 1, 0), await worker.RunOnceAsync(default));
+        await using (var scope = provider.CreateAsyncScope())
+        {
+            var db = scope.ServiceProvider.GetRequiredService<JobTrackerContext>();
+            Assert.Empty(await db.UserNotifications.IgnoreQueryFilters().ToListAsync());
+            Assert.Single(await db.SavedJobSearchResults.IgnoreQueryFilters().ToListAsync());
+        }
+
+        clock.SetUtcNow(clock.GetUtcNow().AddHours(7));
+        discovery.Ids.Add("job-2");
+        Assert.Equal(new BackgroundWorkerRunResult(true, 1, 1, 0), await worker.RunOnceAsync(default));
+
+        await using var verification = provider.CreateAsyncScope();
+        var notification = Assert.Single(await verification.ServiceProvider.GetRequiredService<JobTrackerContext>()
+            .UserNotifications.IgnoreQueryFilters().AsNoTracking().ToListAsync());
+        Assert.Equal("owner-without-jobs", notification.OwnerUserId);
+        Assert.Equal("saved_search_results", notification.Kind);
+        Assert.Equal("/discover", notification.LinkPath);
+        Assert.Contains("Backend Oslo", notification.Message);
+    }
+
+    private sealed class FakeDiscovery(MutableTimeProvider clock, params string[] ids) : IJobDiscoverySearchService
+    {
+        public List<string> Ids { get; } = [.. ids];
+
+        public Task<IReadOnlyList<DiscoveredJob>> SearchAsync(string? query, string? location, CancellationToken cancellationToken) =>
+            Task.FromResult<IReadOnlyList<DiscoveredJob>>(Ids.Select(id => new DiscoveredJob(
+                id, "Backend Developer", "Acme", "Oslo", clock.GetUtcNow(), null,
+                $"https://example.test/{id}", "nav", "NAV Arbeidsplassen", "searched", clock.GetUtcNow(), "NO")).ToList());
+    }
+
+    private sealed class MutableTimeProvider(DateTimeOffset now) : TimeProvider
+    {
+        private DateTimeOffset _now = now;
+        public override DateTimeOffset GetUtcNow() => _now;
+        public void SetUtcNow(DateTimeOffset value) => _now = value;
+    }
+}