diff --git a/lesson_12/io/io_app/src/main/java/com/codedifferently/lesson12/factory/randycastro/CsvDataLoader.java b/lesson_12/io/io_app/src/main/java/com/codedifferently/lesson12/factory/randycastro/CsvDataLoader.java
new file mode 100644
index 00000000..3fbbcbb4
--- /dev/null
+++ b/lesson_12/io/io_app/src/main/java/com/codedifferently/lesson12/factory/randycastro/CsvDataLoader.java
@@ -0,0 +1,104 @@
+package com.codedifferently.lesson12.factory.randycastro;
+
+import com.codedifferently.lesson12.factory.LibraryCsvDataLoader;
+import com.codedifferently.lesson12.models.CheckoutModel;
+import com.codedifferently.lesson12.models.LibraryDataModel;
+import com.codedifferently.lesson12.models.LibraryGuestModel;
+import com.codedifferently.lesson12.models.MediaItemModel;
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.stereotype.Service;
+
+// create a path for each file
+@Service
+public class CsvDataLoader implements LibraryCsvDataLoader {
+  public static void main(String[] args) throws IOException {
+    new CsvDataLoader().loadData();
+  }
+
+  @Override
+  public LibraryDataModel loadData() throws IOException {
+    {
+      var model = new LibraryDataModel();
+      model.mediaItems = new ArrayList<>(); // You load this from the file
+      model.guests = new ArrayList<>(); // You also load this from the file.
+
+      List<MediaItemModel> mediaItems =
+          readMediaItems("lesson_12/io/io_app/src/main/resources/csv/media_items.csv");
+      List<LibraryGuestModel> guests = readGuests("path/to/guests.csv");
+      Map<String, List<CheckoutModel>> checkoutsByGuestEmail =
+          getCheckedOutItems("path/to/checked_out_items.csv");
+
+      for (var guest : guests) {
+        var checkouts = checkoutsByGuestEmail.get(guest.email);
+        if (checkouts != null) {
+          guest.checkedOutItems = checkouts;
+        }
+      }
+
+      return model;
+    }
+  }
+
+  public static List<MediaItemModel> readMediaItems(String Path) {
+    try (BufferedReader reader =
+        new BufferedReader(new FileReader(new ClassPathResource(path).getFile()))) {
+      List<MediaItemModel> items = new ArrayList<>();
+      String line;
+      while ((line = reader.readLine()) != null) {
+        var parts = line.split(",");
+        var item = new MediaItemModel();
+
+        item.type = parts[0];
+        item.id = UUID.fromString(parts[1]);
+        item.title = parts[2];
+        item.isbn = parts[3];
+        item.authors = List.of(parts[4]);
+
+        if (parts[5].equals("")) {
+          item.pages = 0;
+        } else {
+          item.pages = Integer.parseInt(parts[5]);
+        }
+
+        if (parts[6].equals("")) {
+          item.runtime = 0;
+        } else {
+          item.runtime = Integer.parseInt(parts[6]);
+        }
+        item.edition = parts[7];
+
+        items.add(item);
+      }
+      return items;
+    } catch (IOException e) {
+      throw new RuntimeException("Failed to read media items", e);
+    }
+  }
+}
+
+ /*List<MediaItemModel> readMediaItems(String filePath) {
+ List<MediaItemModel> items = new ArrayList<>();
+ try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
+     String line;
+     while ((line = reader.readLine()) != null) {
+         String[] parts = line.split(",");
+          MediaItemModel item = new MediaItemModel();
+                 item.setType(parts[0]);
+                 item.setId(parts[1]);
+                 item.setAuthor(parts[2]);
+                 item.setTitle(parts[3]); // Assuming 'title' instead of 'type' again
+                 items.add(item);
+             }
+         } catch (IOException e) {
+             e.printStackTrace();
+             // Handle the exception appropriately
+         }
+         return items;
+     }
+ }*/