Update function to load n years of history

Add a function to load participants data from the current year file

src/file_io.py

@@ -1,13 +1,57 @@
 import csv
+from datetime import date
+from env import CSV_PREFIX, CSV_PATH
 
-def open_csv(file_name):
-    """Open the CSV file and return its contents as a list of rows"""
-    with open(file_name, "r", encoding='utf-8') as file:
-        reader = csv.reader(file)
-        return list(reader)
+def load_history(years):
+    """
+    Load participant data from multiple CSV files based on the specified history years.
+    :param years: Number of years of history to load.
+    :return: A list of all historical draw data.
+    """
+    current_year = date.today().year
+    history_data = []
 
-def save_csv(data, file_name):
-    """Save the updated draw results to the CSV file"""
+    # Load data for each of the past specified years
+    for i in range(1, years + 1):
+        
+        try:
+            year = current_year - i
+            file_name = f"{CSV_PATH}/{CSV_PREFIX}_{year}.csv"
+            with open(file_name, "r", encoding='utf-8') as file:
+                reader = csv.reader(file)
+                history_data.extend(list(reader))  # Add each year's data
+        except FileNotFoundError:
+            print(f"No historical file found for year {year}, skipping.")
+            continue           
+
+    return history_data
+
+def load_participants():
+    """
+    Load participant data from the current year CSV file.
+    :return: A list of all historical draw data.
+    """
+    current_year = date.today().year
+    participants_data = []
+    try:
+        file_name = f"{CSV_PATH}/{CSV_PREFIX}_{current_year}.csv"
+        print(file_name)
+        with open(file_name, "r", encoding='utf-8') as file:
+            reader = csv.reader(file)
+            participants_data.extend(list(reader))  # Add each year's data
+    except FileNotFoundError:
+        print(f"No  file found for year {current_year}, skipping.")
+                    
+
+    return participants_data
+
+def save_csv(data, year):
+    """
+    Save the new draw results to a CSV file named with the current year.
+    :param data: New draw data.
+    :param year: The current year for naming the file.
+    """
+    file_name = f"{CSV_PATH}/{CSV_PREFIX}_{year}.csv"
     with open(file_name, 'w', newline='', encoding='utf-8') as file:
         writer = csv.writer(file)
         writer.writerows(data)