[CHANGE] Add account dialog

Manager.YouTube/Parsers/HtmlParser.cs

@@ -1,4 +1,3 @@
-using System.Text.RegularExpressions;
 using DotBased.Monads;
 using HtmlAgilityPack;
 
@@ -6,34 +5,60 @@ namespace Manager.YouTube.Parsers;
 
 public static class HtmlParser
 {
-    public static Result<string> GetJsonFromScriptFunction(string html, string functionName)
+    public static Result<(string, string)> GetStateJson(string html)
     {
         if (string.IsNullOrWhiteSpace(html))
         {
             return ResultError.Fail("html cannot be empty!");
         }
-        
-        if (string.IsNullOrWhiteSpace(functionName))
-        {
-            return ResultError.Fail("No function names provided!");
-        }
 
         var htmlDocument = new HtmlDocument();
         htmlDocument.LoadHtml(html);
-        
-        var scriptNode = htmlDocument.DocumentNode.SelectSingleNode($"//script[contains(., '{functionName}')]");
-        if (string.IsNullOrWhiteSpace(scriptNode.InnerText))
-            return ResultError.Fail($"Could not find {functionName} in html script nodes!");
-        
-        var regexPattern = $@"{Regex.Escape(functionName)}\(([^)]+)\);";
-        var match = Regex.Match(scriptNode.InnerText, regexPattern);
 
-        if (match.Success)
+        const string setFunction = "ytcfg.set({";
+        var scriptNode = htmlDocument.DocumentNode.SelectSingleNode($"//script[contains(., '{setFunction}')]");
+        if (string.IsNullOrWhiteSpace(scriptNode.InnerText))
+            return ResultError.Fail($"Could not find {setFunction} in html script nodes!");
+        
+        var json = ExtractJson(scriptNode.InnerText, "ytcfg.set(");
+        var jsonText = ExtractJson(scriptNode.InnerText, "setMessage(");
+
+        if (string.IsNullOrWhiteSpace(json) || string.IsNullOrWhiteSpace(jsonText))
         {
-            var jsonString = match.Groups[1].Value.Trim();
-            return jsonString;
+            return ResultError.Fail($"Could not find {setFunction} in html script nodes!");
         }
 
-        return ResultError.Fail($"Unable to parse {functionName} JSON!");
+        return (json, jsonText);
+    }
+    
+    static string? ExtractJson(string input, string marker)
+    {
+        var start = input.IndexOf(marker, StringComparison.Ordinal);
+        if (start < 0) return null;
+
+        start += marker.Length;
+
+        // Skip until first '{'
+        while (start < input.Length && input[start] != '{')
+            start++;
+
+        if (start >= input.Length) return null;
+
+        var depth = 0;
+        var i = start;
+
+        for (; i < input.Length; i++)
+        {
+            if (input[i] == '{') depth++;
+            else if (input[i] == '}')
+            {
+                depth--;
+                if (depth != 0) continue;
+                i++;
+                break;
+            }
+        }
+
+        return input[start..i];
     }
 }