Add shared recent tables state

src/RolemasterDb.App/Components/Pages/Tables.razor

@@ -6,6 +6,7 @@
 @using System.Linq
 @inject IJSRuntime JSRuntime
 @inject LookupService LookupService
+@inject RolemasterDb.App.Frontend.AppState.RecentTablesState RecentTablesState
 
 <PageTitle>Critical Tables</PageTitle>
 
@@ -292,7 +293,10 @@
             if (tableDetail is null)
             {
                 detailError = "The selected table could not be loaded.";
+                return;
             }
+
+            await RecordRecentTableVisitAsync();
         }
         catch (Exception exception)
         {
@@ -769,6 +773,20 @@
     private Task PersistSelectedTableAsync(string tableSlug) =>
         JSRuntime.InvokeVoidAsync("localStorage.setItem", SelectedTableStorageKey, tableSlug).AsTask();
 
+    private Task RecordRecentTableVisitAsync()
+    {
+        if (SelectedTableReference is not { } selectedTable)
+        {
+            return Task.CompletedTask;
+        }
+
+        return RecentTablesState.RecordVisitAsync(
+            selectedTable.Key,
+            selectedTable.Label,
+            selectedTable.Family,
+            selectedTable.CurationPercentage);
+    }
+
     private string GetTableOptionCssClass(CriticalTableReference table)
     {
         var classes = new List<string>();

src/RolemasterDb.App/Frontend/AppState/BrowserStorageKeys.cs

@@ -3,4 +3,5 @@ namespace RolemasterDb.App.Frontend.AppState;
 public static class BrowserStorageKeys
 {
     public const string ThemeMode = "rolemaster.theme.mode";
+    public const string RecentTables = "rolemaster.tables.recent";
 }

src/RolemasterDb.App/Frontend/AppState/RecentTableEntry.cs

@@ -0,0 +1,8 @@
+namespace RolemasterDb.App.Frontend.AppState;
+
+public sealed record RecentTableEntry(
+    string Slug,
+    string Label,
+    string Family,
+    int CurationPercentage,
+    DateTimeOffset ViewedAtUtc);

src/RolemasterDb.App/Frontend/AppState/RecentTablesState.cs

@@ -0,0 +1,108 @@
+using System.Text.Json;
+
+namespace RolemasterDb.App.Frontend.AppState;
+
+public sealed class RecentTablesState(BrowserStorageService browserStorage)
+{
+    private const int MaxItems = 8;
+    private static readonly JsonSerializerOptions SerializerOptions = new(JsonSerializerDefaults.Web);
+    private bool isInitialized;
+
+    public IReadOnlyList<RecentTableEntry> Items { get; private set; } = [];
+
+    public event Action? Changed;
+
+    public async Task InitializeAsync()
+    {
+        if (isInitialized)
+        {
+            return;
+        }
+
+        try
+        {
+            var storedValue = await browserStorage.GetItemAsync(BrowserStorageKeys.RecentTables);
+            Items = DeserializeItems(storedValue);
+            isInitialized = true;
+            Changed?.Invoke();
+        }
+        catch (JsonException)
+        {
+            Items = [];
+            isInitialized = true;
+            Changed?.Invoke();
+        }
+        catch (InvalidOperationException)
+        {
+            // JS interop is unavailable during prerender. Retry on the next interactive render.
+        }
+    }
+
+    public async Task RecordVisitAsync(string slug, string label, string family, int curationPercentage)
+    {
+        if (string.IsNullOrWhiteSpace(slug) || string.IsNullOrWhiteSpace(label))
+        {
+            return;
+        }
+
+        await InitializeAsync();
+
+        var updatedItems = new List<RecentTableEntry>
+        {
+            new(
+                slug.Trim(),
+                label.Trim(),
+                family.Trim(),
+                curationPercentage,
+                DateTimeOffset.UtcNow)
+        };
+
+        foreach (var item in Items)
+        {
+            if (string.Equals(item.Slug, slug, StringComparison.OrdinalIgnoreCase))
+            {
+                continue;
+            }
+
+            updatedItems.Add(item);
+            if (updatedItems.Count == MaxItems)
+            {
+                break;
+            }
+        }
+
+        Items = updatedItems;
+        await PersistAsync();
+        Changed?.Invoke();
+    }
+
+    private async Task PersistAsync()
+    {
+        var serialized = JsonSerializer.Serialize(Items, SerializerOptions);
+        await browserStorage.SetItemAsync(BrowserStorageKeys.RecentTables, serialized);
+    }
+
+    private static IReadOnlyList<RecentTableEntry> DeserializeItems(string? storedValue)
+    {
+        if (string.IsNullOrWhiteSpace(storedValue))
+        {
+            return [];
+        }
+
+        var items = JsonSerializer.Deserialize<List<RecentTableEntry>>(storedValue, SerializerOptions);
+        if (items is null || items.Count == 0)
+        {
+            return [];
+        }
+
+        return items
+            .Where(item => !string.IsNullOrWhiteSpace(item.Slug) && !string.IsNullOrWhiteSpace(item.Label))
+            .GroupBy(item => item.Slug, StringComparer.OrdinalIgnoreCase)
+            .Select(group => group
+                .OrderByDescending(item => item.ViewedAtUtc)
+                .First())
+            .OrderByDescending(item => item.ViewedAtUtc)
+            .Take(MaxItems)
+            .ToList();
+    }
+}

src/RolemasterDb.App/Program.cs

@@ -13,6 +13,7 @@ builder.Services.AddDbContextFactory<RolemasterDbContext>(options => options.Use
 builder.Services.AddSingleton<CriticalImportArtifactLocator>();
 builder.Services.AddScoped<LookupService>();
 builder.Services.AddScoped<BrowserStorageService>();
+builder.Services.AddScoped<RecentTablesState>();
 builder.Services.AddScoped<ThemeState>();
 
 var app = builder.Build();