🔧✉️ Refactor Invoice Emailing Utility

- 🌐 Enhanced web interface for invoice emailing config management with GET/POST at '/data'.
- 📝 Refactored Flask app to specialize as an invoice emailing utility.
- 🔍 Improved read_yaml() to return data and error messages.
- 📤 Enhanced write_yaml() for better YAML file handling.
- 🛠️ Updated handle_data() to efficiently handle '/data' route with GET/POST methods.

Note: Excluded changes to imports and requires.

main.py

@@ -1,8 +1,8 @@
 """
-Flask app for YAML file I/O.
+Invoice Emailing Utility.
 
-Provides web interface for reading and updating YAML file content.
-Handles HTTP GET (view) and POST (update) at '/data', and serves index page at '/'.
+Provides a web interface for managing invoice emailing configurations.
+Handles HTTP GET (view) and POST (update) at '/data' for configuration data, and serves the main app page at '/'.
 
 Author: Isaak Buslovich
 Date: 2023-12-21
@@ -15,16 +15,15 @@ import logging
 app = Flask(__name__, static_folder='.', static_url_path='')
 logging.basicConfig(level=logging.INFO)
 
-DATA_FILE = 'config.yaml'  # Ensure this is the correct path to your YAML file
+DATA_FILE = 'config.yaml'
 
 
 def read_yaml():
     """
-    Reads and returns content from the YAML file.
-
-    Returns:
-        dict: A dictionary with the key 'email' and 'email_template' containing their respective contents.
-        None: If an error occurs, along with an error message.
+    Reads data from YAML file specified by DATA_FILE. Returns a tuple containing the data and error message.
+    On success: Returns (data_dict, None), where data_dict contains 'email' and 'email_template'.
+    On file not found: Logs a message and returns ({'email': {}, 'email_template': ''}, None).
+    On error: Logs the specific error and returns (None, error_message), where error_message explains the issue.
     """
     file_path = Path(DATA_FILE)
     try:
@@ -50,15 +49,17 @@ def read_yaml():
 
 def write_yaml(email_data, email_template_data):
     """
-    Writes content to the YAML file.
+    Writes email and template data to the YAML file defined by DATA_FILE.
 
     Args:
-        email_data (dict): The data for the 'email' section.
-        email_template_data (str): The data for the 'email_template' section.
+        email_data (dict): Email configuration settings.
+        email_template_data (str): Email template content.
 
     Returns:
-        bool: True if the operation was successful, False otherwise.
-        None: If successful, or an error message if an error occurs.
+        tuple: (bool, str) indicating success status and an error message if any.
+
+    Raises:
+        Exception: Logs and returns error details upon failure.
     """
     file_path = Path(DATA_FILE)
     try:
@@ -76,13 +77,11 @@ def write_yaml(email_data, email_template_data):
 @app.route('/data', methods=['GET', 'POST'])
 def handle_data():
     """
-    Handles GET and POST requests to '/data'.
-    GET: Returns the content of the YAML file.
-    POST: Updates the content of the YAML file.
-
-    Returns:
-        JSON response for GET requests.
-        JSON response for POST requests indicating success or failure.
+    Flask route handler function for '/data', accepting both GET and POST methods. - GET method: Reads and outputs
+    data from the YAML configuration file. In case of errors, it returns a 500 status code with an error message. -
+    POST method: Gets 'email' and 'email_template' data from the request, writes it to the YAML configuration file.
+    In case of write errors, it returns a 500 status code with an error message. Otherwise, it returns a message
+    stating the file was saved successfully with a 200 status code.
     """
     if request.method == 'GET':
         data, error = read_yaml()