can parse at least some markdown quiz questions

Management/Models/Local/LocalQuizQuestion.cs

@@ -1,3 +1,5 @@
+using System.Text.RegularExpressions;
+
 namespace LocalModels;
 
 public record LocalQuizQuestion
@@ -21,7 +23,7 @@ public record LocalQuizQuestion
 
 
       var questionTypeIndicator = isMultipleChoice
-        ? $"{correctIndicator}{questionLetter}) " 
+        ? $"{correctIndicator}{questionLetter}) "
         : $"[{correctIndicator}] ";
 
       var textWithSpecificNewline = answer.Text.Replace(Environment.NewLine, Environment.NewLine + "   ");
@@ -35,6 +37,67 @@ public record LocalQuizQuestion
 ---
 ";
   }
+
+  private static readonly string[] validFirstAnswerDelimiters = new string[] { "*a)", "a)", "[ ]", "[*]" };
+  public static LocalQuizQuestion ParseMarkdown(string input)
+  {
+    var lines = input.Split(Environment.NewLine);
+    var firstLineIsPoints = lines.First().Contains("points: ", StringComparison.CurrentCultureIgnoreCase);
+    int points = firstLineIsPoints ? int.Parse(lines.First().Split(": ")[1]) : 1;
+
+    var linesWithoutPoints = firstLineIsPoints ? lines[1..] : lines;
+
+    var linesWithoutAnswers = linesWithoutPoints
+      .TakeWhile(line => !validFirstAnswerDelimiters.Any(prefix => line.TrimStart().StartsWith(prefix)))
+      .ToArray();
+    var description = string.Join(Environment.NewLine, linesWithoutAnswers);
+
+    
+    LocalQuizQuestionAnswer[] answers = getAnswers(linesWithoutPoints);
+
+    return new LocalQuizQuestion()
+    {
+      Text = description,
+      Points = points,
+      Answers = answers
+    };
+  }
+
+  private static LocalQuizQuestionAnswer[] getAnswers(string[] linesWithoutPoints)
+  {
+    var indexOfAnswerStart = linesWithoutPoints
+          .ToList()
+          .FindIndex(
+            l => validFirstAnswerDelimiters.Any(prefix => l.TrimStart().StartsWith(prefix))
+          );
+    var answerLinesRaw = linesWithoutPoints[indexOfAnswerStart..];
+
+    var answerStartPattern = @"^(\*?[a-z]\))|\[\s*\]|\[\*\]";
+    var answerLines = answerLinesRaw.Aggregate(new List<string>(), (acc, line) =>
+    {
+      if (!Regex.IsMatch(line, answerStartPattern))
+      {
+        if (acc.Count != 0) // Append to the previous line if there is one
+        {
+          int lastIndex = acc.Count - 1;
+          acc[lastIndex] += Environment.NewLine + line;
+        }
+        else
+        {
+          acc.Add(line);
+        }
+      }
+      else
+      {
+        acc.Add(line); // Add as a new line if it matches the pattern
+      }
+
+      return acc;
+    });
+
+    var answers = answerLines.Select(LocalQuizQuestionAnswer.ParseMarkdown).ToArray();
+    return answers;
+  }
 }
 
 public static class QuestionType