Add .env configuration support

main.py

@@ -2,15 +2,27 @@ import os
 import json
 import requests
 from jdatetime import datetime, timedelta
+from dotenv import load_dotenv
 
-BARGHEMAN_TOKEN = os.getenv("BARGHEMAN_TOKEN")
-EITAAYAR_TOKEN = os.getenv("EITAAYAR_TOKEN")
-CHAT_ID = os.getenv("CHAT_ID")
-BILL_IDS = os.getenv("BILL_IDS", "").split(",")
-BLACKOUTS_FILE = os.getenv("BLACKOUTS_FILE")
+# Load local configuration without overriding variables supplied by the shell or CI.
+load_dotenv()
 
-if not BARGHEMAN_TOKEN or not EITAAYAR_TOKEN or not CHAT_ID or len(BILL_IDS) == 0:
-    raise EnvironmentError("Environment is not ready!")
+BARGHEMAN_TOKEN = os.getenv("BARGHEMAN_TOKEN", "").strip()
+EITAAYAR_TOKEN = os.getenv("EITAAYAR_TOKEN", "").strip()
+CHAT_ID = os.getenv("CHAT_ID", "").strip()
+BILL_IDS = [bill_id.strip() for bill_id in os.getenv("BILL_IDS", "").split(",") if bill_id.strip()]
+BLACKOUTS_FILE = os.getenv("BLACKOUTS_FILE", "").strip()
+
+required_settings = {
+    "BARGHEMAN_TOKEN": BARGHEMAN_TOKEN,
+    "EITAAYAR_TOKEN": EITAAYAR_TOKEN,
+    "CHAT_ID": CHAT_ID,
+    "BILL_IDS": BILL_IDS,
+    "BLACKOUTS_FILE": BLACKOUTS_FILE,
+}
+missing_settings = [name for name, value in required_settings.items() if not value]
+if missing_settings:
+    raise EnvironmentError(f"Missing required environment variables: {', '.join(missing_settings)}")
 
 today = datetime.now()
 to_date = today + timedelta(days=5)