pivoting to local yaml files for state

Management/Services/YamlManager.cs

@@ -0,0 +1,46 @@
+using LocalModels;
+using YamlDotNet.Serialization;
+using YamlDotNet.Serialization.NamingConventions;
+
+public class YamlManager
+{
+  public string CourseToYaml(LocalCourse course)
+  {
+    var serializer = new SerializerBuilder()
+      .Build();
+    var yaml = serializer.Serialize(course);
+
+    System.Console.WriteLine(yaml);
+    return yaml;
+  }
+
+  public LocalCourse ParseCourse(string rawCourse)
+  {
+    var deserializer = new DeserializerBuilder()
+      .Build();
+
+    var person = deserializer.Deserialize<LocalCourse>(rawCourse);
+    return person;
+  }
+
+  public async Task SaveCourse(LocalCourse course)
+  {
+    var courseString = CourseToYaml(course);
+
+    await File.WriteAllTextAsync($"../storage/{course.Name}.yml", courseString);
+  }
+
+  public async Task<IEnumerable<LocalCourse>> LoadSavedCourses()
+  {
+    string path = "../storage/";
+    if (!Directory.Exists(path))
+      throw new Exception("storage folder not found");
+
+    var fileNames = Directory.GetFiles(path);
+
+    var courses = await Task.WhenAll(
+      fileNames.Select(async n => ParseCourse(await File.ReadAllTextAsync($"../storage/{n}")))
+    );
+    return courses;
+  }
+}