Add the HTML generation for real

Extensions/RenderContentHtml.cs

@@ -0,0 +1,72 @@
+namespace QuestReader.Extensions;
+
+using System.Web;
+using QuestReader.Models;
+using QuestReader.Models.ParsedContent;
+
+public static class RenderContentHtmlExtension
+{
+    public static string RenderContentHtml(this ContentNode node, TemplateModel model)
+    {
+        return node switch
+        {
+            RootNode rootNode => string.Join("", rootNode.Nodes.Select(n => n.RenderContentHtml(model))),
+            TextNode textNode => textNode.Text,
+            NewlineNode => "<br>\n",
+            ReferenceNode refNode => refNode.RenderReferenceHtml(model),
+            ContainerNode container => container.RenderContailerHtml(model),
+            _ => throw new NotImplementedException(),
+        };
+    }
+
+
+    static string RenderContailerHtml(this ContainerNode node, TemplateModel model)
+    {
+        var tag = node switch
+        {
+            QuoteNode => "span",
+            BoldNode => "strong",
+            ItalicsNode => "em",
+            StrikeoutNode => "s",
+            UnderlineNode => "span",
+            SpoilerNode => "span",
+            ExternalLinkNode => "a",
+            null => throw new NullReferenceException("Node is null, something is ver wrong"),
+            _ => throw new NotImplementedException($"Rendering not implemented for {node.GetType().Name}"),
+        };
+
+        string? extra = node switch
+        {
+            QuoteNode quote => " class=\"text-quote\"",
+            UnderlineNode => " class=\"text-underline\"",
+            SpoilerNode => " class=\"text-spoiler\"",
+            ExternalLinkNode externalLink => $" href=\"{HttpUtility.HtmlAttributeEncode(externalLink.Destination)}\"",
+            _ => null,
+        };
+        var content = string.Join("", node.Nodes.Select(n => n.RenderContentHtml(model)));
+
+        // The spaces around this are absolutely stopgap and will NOT work for something like "abso<em>-fucking-</em>lutely"
+        // HTML is... frustrating
+        // Note for future implementation: don't trim, just collapse to single space
+        // Search regex "[^>\s;]<[^>]>". And yes there /are/ hits. Fuck!
+        return $" <{tag}{extra}>{content}</{tag}> ";
+    }
+
+    static string RenderReferenceHtml(this ReferenceNode node, TemplateModel model)
+    {
+        var type = node.ReferenceType switch
+        {
+            ReferenceType.QuestActive => "quest",
+            ReferenceType.QuestArchive => "quest-archived",
+            ReferenceType.QuestDiscussion => "discussion",
+            _ => throw new NotImplementedException(),
+        };
+
+        var included = model.Metadata.Threads.Any(t => t == node.ThreadId) && model.Posts.Any(p => p.Id == node.PostId);
+        var href = "";
+        if (included)
+            href = $"href=\"#post-{node.PostId}\" ";
+
+        return $"<a {href}class=\"post-reference\" data-thread=\"{node.ThreadId}\" data-post=\"{node.PostId}\" data-type=\"{type}\">&gt;&gt;{node.PostId}</a>";
+    }
+}