Add a diagnostics page that lists all system wiki pages needed by the…

… site code and flag any that do not exist

TASVideos/Constants.cs

@@ -1,4 +1,5 @@
-using Microsoft.AspNetCore.Mvc.Rendering;
+using System.Reflection;
+using Microsoft.AspNetCore.Mvc.Rendering;
 
 namespace TASVideos;
 
@@ -45,4 +46,10 @@ public static class SystemWiki
 	public const string WelcomeText = "System/WelcomeText";
 	public const string WikiEditHelp = "System/WikiEditHelp";
 	public const string WikiEditNote = "System/WikiEditNote";
+
+	public static readonly HashSet<string> Pages = typeof(SystemWiki)
+		.GetFields(BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy)
+		.Where(fi => fi.IsLiteral && !fi.IsInitOnly)
+		.Select(fi => fi.GetRawConstantValue()?.ToString() ?? "")
+		.ToHashSet(StringComparer.InvariantCultureIgnoreCase);
 }

TASVideos/Pages/Diagnostics/Index.cshtml

@@ -36,6 +36,7 @@
 	<li><a asp-page="Logging">Logging</a></li>
 	<li><a asp-page="SendTweet">Send a Tweet</a></li>
 	<li><a asp-page="SendEmail">Send an Email</a></li>
+	<li><a asp-page="SystemPages">System Wiki Pages</a></li>
 </ul>
 
 <table class="table table-bordered table-striped">

TASVideos/Pages/Diagnostics/SystemPages.cshtml

@@ -0,0 +1,29 @@
+@page
+@{ ViewData.SetTitle("System Wiki Pages Used By the Site Code"); }
+@model SystemPagesModel
+<ul>
+	<li><a asp-page="Index">Diagnostics</a></li>
+</ul>
+<label class="float-end">Total: @Model.SystemPages.Count</label>
+<table class="table table-bordered table-striped">
+	<thead>
+		<tr>
+			<th>Page Name</th>
+			<th>Exists</th>
+		</tr>
+	</thead>
+	<tbody>
+		@foreach (var p in Model.SystemPages.OrderBy(p => p.Exists).ThenBy(p => p.Name))
+		{
+			<tr>
+				<td>
+					<wiki-link page-name="@p.Name"></wiki-link>
+				<td>
+				<td>
+					<i condition="p.Exists" class="text-success fa fa-check"></i>
+					<i condition="!p.Exists" class="text-danger fa fa-exclamation"></i>
+				</td>
+			</tr>
+		}
+	</tbody>
+</table>

TASVideos/Pages/Diagnostics/SystemPages.cshtml.cs

@@ -0,0 +1,30 @@
+using Microsoft.AspNetCore.Mvc;
+using TASVideos.Core.Services.Wiki;
+using TASVideos.Data.Entity;
+
+namespace TASVideos.Pages.Diagnostics;
+
+[RequirePermission(PermissionTo.SeeDiagnostics)]
+public class SystemPagesModel : BasePageModel
+{
+	private readonly IWikiPages _wikiPages;
+
+	public SystemPagesModel(IWikiPages wikiPages)
+	{
+		_wikiPages = wikiPages;
+	}
+
+	public record SystemPage(string Name, bool Exists);
+	public List<SystemPage> SystemPages { get; set; } = new List<SystemPage>();
+
+	public async Task<IActionResult> OnGet()
+	{
+		foreach (var page in SystemWiki.Pages)
+		{
+			var exists = await _wikiPages.Exists(page);
+			SystemPages.Add(new SystemPage(page, exists));
+		}
+
+		return Page();
+	}
+}