games/convert_price.py

@@ -2,20 +2,28 @@ import requests
 
 from games.models import ExchangeRate, Purchase
 
+# fixme: save preferred currency in user model
+currency_to = "CZK"
+
+
+def save_converted_info(purchase, converted_price, converted_currency):
+    purchase.converted_price = converted_price
+    purchase.converted_currency = converted_currency
+    purchase.save()
+
 
 def update_converted_prices():
-    purchases = Purchase.objects.filter(
+    purchases = (
+        Purchase.objects.filter(
             converted_price__isnull=True, converted_currency__isnull=True
         )
+        .exclude(price_currency__iexact=currency_to)
+        .exclude(price=0)
+    )
 
     for purchase in purchases:
-        if purchase.price == 0:
-            continue
         year = purchase.date_purchased.year
         currency_from = purchase.price_currency
-        # fixme: save preferred currency in user model
-        currency_to = "CZK"
-
         exchange_rate = ExchangeRate.objects.filter(
             currency_from=currency_from, currency_to=currency_to, year=year
         ).first()
@@ -23,12 +31,11 @@ def update_converted_prices():
         if not exchange_rate:
             try:
                 response = requests.get(
-                    f"https://api.exchangeratesapi.io/{year}-01-01",
-                    params={"base": currency_to, "symbols": "currency_from"},
+                    f"https://cdn.jsdelivr.net/npm/@fawazahmed0/currency-api@{year}-01-01/v1/currencies/{currency_from}.json"
                 )
                 response.raise_for_status()
                 data = response.json()
-                rate = data["rates"].get(currency_from)
+                rate = data[currency_from].get(currency_to)
 
                 if rate:
                     exchange_rate = ExchangeRate.objects.create(
@@ -39,10 +46,9 @@ def update_converted_prices():
                     )
             except requests.RequestException as e:
                 print(
-                    f"Failed to fetch exchange rate for {currency_from} in {year}: {e}"
+                    f"Failed to fetch exchange rate for {currency_from}->{currency_to} in {year}: {e}"
                 )
         if exchange_rate:
-            converted_price = purchase.price * exchange_rate.rate
-            purchase.converted_price = converted_price
-            purchase.converted_currency = currency_to
-            purchase.save()
+            save_converted_info(
+                purchase, purchase.price * exchange_rate.rate, currency_to
+            )