diff --git a/fetcher.py b/fetcher.py
index abaeb88..09edfc9 100644
--- a/fetcher.py
+++ b/fetcher.py
@@ -1,5 +1,4 @@
-import json
-from re import error
+from typing import Any, cast
 import ovh
 
 
@@ -10,13 +9,21 @@ def fetch_api(app_key: str, app_secret: str, consumer_key: str) -> list[str]:
         application_secret=app_secret,
         consumer_key=consumer_key,
     )
-    bills = client.get("/me/bill/")
+    data: Any = client.get("/me/bill/")
+
+    if data is None:
+        return []
+
+    if not isinstance(data, list) or not all(isinstance(x, str) for x in data):
+        raise TypeError("Réponse OVH inattendue pour /me/bill/: liste de str requise")
+
+    bills: list[str] = cast(list[str], data)
     return bills
 
 
 def fetch_invoice_content(
     id: str, app_key: str, app_secret: str, consumer_key: str
-) -> dict:
+) -> dict[str, Any]:
     client = ovh.Client(
         endpoint="ovh-eu",
         application_key=app_key,
@@ -24,4 +31,6 @@ def fetch_invoice_content(
         consumer_key=consumer_key,
     )
     bill = client.get(f"/me/bill/{id}")
+    if bill is None:
+        raise RuntimeError(f"Facture {id} introuvable")
     return bill
diff --git a/main.py b/main.py
index d258dc8..882f4b9 100644
--- a/main.py
+++ b/main.py
@@ -1,14 +1,32 @@
 import os
+from datetime import datetime
 import dotenv
 import ovh
 import fetcher as ft
-import datetime
 from urllib.request import urlretrieve
 
 dotenv.load_dotenv()
-APP_KEY = os.getenv("APP_KEY")
-APP_SECRET = os.getenv("APP_SECRET")
-CONSUMER_KEY = os.getenv("CONSUMER_KEY")
+APP_KEY = os.environ["APP_KEY"]
+APP_SECRET = os.environ["APP_SECRET"]
+CONSUMER_KEY = os.environ["CONSUMER_KEY"]
+PATH_OVH = os.environ["OVH_PATH"]
+YEAR = datetime.now().year
+
+
+def indexer(ids: list[str]) -> list[str]:
+    ids_already_in = os.listdir(f"{PATH_OVH}/{YEAR}")
+    missing = [x for x in ids if f"{x}.pdf" not in ids_already_in]
+    result = []
+    for x in missing:
+        date_str = ft.fetch_invoice_content(
+            x,
+            app_secret=APP_SECRET,
+            app_key=APP_KEY,
+            consumer_key=CONSUMER_KEY,
+        )["date"]
+        if datetime.fromisoformat(date_str).year >= int(YEAR):
+            result.append(x)
+    return result
 
 
 def get_ids() -> list[str]:
@@ -35,15 +53,20 @@ def get_bill(bill_id: str) -> dict:
         raise RuntimeError(f"Échec récupération facture {bill_id}: {e}") from e
 
 
-def get_pdf(bill: dict):
+def save_pdf(bill: dict):
+    date = datetime.fromisoformat(bill["date"]).date()
+    path = f"{PATH_OVH}/{date.year}"
+
+    if not os.path.isdir(path):
+        os.mkdir(path)
     url = bill["pdfUrl"]
-    date = f"{datetime.datetime.fromisoformat(bill['date']).date()}.pdf"
-    urlretrieve(url, date)
+    urlretrieve(url, f"{PATH_OVH}{bill['billId']}.pdf")
 
 
 if __name__ == "__main__":
-    ids = get_ids()
-    print(ids)
+    if not os.path.isdir(PATH_OVH):
+        os.mkdir(PATH_OVH)
+    ids = indexer(get_ids())
     if ids:
-        bill = get_bill(ids[0])
-        get_pdf(bill)
+        for id in ids:
+            save_pdf(get_bill(id))