Update app.py

app.py

@@ -1,7 +1,68 @@
 from fastapi import FastAPI
+import requests
+import json
+import time
 
 app = FastAPI()
 
-@app.get("/")
-def greet_json():
-    return {"Hello": "World!"}
+import os
+
+# Access the API key from the secret
+API_KEY = os.getenv("apikey")
+
+# Check if the API key is loaded correctly (optional)
+if api_key:
+    print("API key loaded successfully!")
+else:
+    print("API key not found!")
+
+API_URL = f"https://v6.exchangerate-api.com/v6/{API_KEY}/latest/USD"
+CACHE = None
+LAST_FETCH_TIME = None
+CACHE_TTL = 3600  # Time to live for cache in seconds (1 hour)
+
+def fetch_exchange_rates():
+    """Fetch the exchange rates from the API."""
+    response = requests.get(API_URL)
+    if response.status_code == 200:
+        return response.json()
+    else:
+        return None
+
+def get_cached_rates():
+    """Return cached rates if they exist and are not expired."""
+    global CACHE, LAST_FETCH_TIME
+
+    # Check if the cache is expired
+    if CACHE is None or (time.time() - LAST_FETCH_TIME) > CACHE_TTL:
+        # Cache is either not set or expired, fetch new rates
+        rates_data = fetch_exchange_rates()
+        if rates_data:
+            CACHE = rates_data
+            LAST_FETCH_TIME = time.time()  # Update the fetch time
+        else:
+            return {"error": "Failed to fetch exchange rates"}
+    
+    return CACHE
+
+@app.get("/exchange-rates")
+async def get_exchange_rates():
+    """Endpoint to fetch the exchange rates."""
+    rates = get_cached_rates()
+    return rates
+
+@app.get("/convert")
+async def convert_currency(amount: float, from_currency: str, to_currency: str):
+    """Endpoint to convert currency from one to another."""
+    rates = get_cached_rates()
+
+    if "error" in rates:
+        return {"error": "Failed to fetch exchange rates"}
+
+    try:
+        from_rate = rates["conversion_rates"][from_currency]
+        to_rate = rates["conversion_rates"][to_currency]
+        converted_amount = amount * (to_rate / from_rate)
+        return {"converted_amount": converted_amount}
+    except KeyError:
+        return {"error": "Invalid currency code"}