Update app.py

app.py

@@ -1,37 +1,62 @@
 import streamlit as st
 import requests
 
-def get_exchange_rate(from_currency, to_currency):
+# Predefined currency mappings for PKR conversions
+PREDEFINED_RATES = {
+    "AED": "United Arab Emirates Dirham",
+    "SAR": "Saudi Riyal",
+    "KWD": "Kuwaiti Dinar",
+    "TRY": "Turkish Lira"
+}
+
+def get_exchange_rate(base_currency, target_currency):
+    """
+    Fetch the exchange rate from an API.
+    """
     try:
-        url = f"https://api.exchangerate-api.com/v4/latest/{from_currency}"
+        url = f"https://api.exchangerate-api.com/v4/latest/{base_currency}"
         response = requests.get(url)
+        response.raise_for_status()
         data = response.json()
-        rate = data["rates"].get(to_currency, None)
-        return rate
+        return data["rates"].get(target_currency, None)
     except Exception as e:
-        st.error(f"An error occurred: {e}")
+        st.error(f"Error fetching exchange rate: {e}")
         return None
 
 def main():
     st.title("Currency Converter App")
-    st.write("Convert amounts between different currencies using real-time exchange rates.")
-
+    st.write("Convert PKR to predefined currencies or any currency pair globally.")
+    
     # Input Section
-    amount = st.number_input("Enter the amount:", min_value=0.0, format="%.2f")
-    from_currency = st.text_input("From Currency (e.g., USD, EUR):").upper()
-    to_currency = st.text_input("To Currency (e.g., USD, EUR):").upper()
+    amount = st.number_input("Enter the amount to convert:", min_value=0.0, format="%.2f")
+    base_currency = st.text_input("Base Currency (e.g., PKR, USD):").upper()
+    
+    predefined_target = st.radio(
+        "Choose a predefined target currency (for PKR):",
+        list(PREDEFINED_RATES.keys()) + ["Custom"],
+        horizontal=True
+    )
+    
+    if predefined_target == "Custom":
+        target_currency = st.text_input("Target Currency (e.g., USD, EUR):").upper()
+    else:
+        target_currency = predefined_target
 
     # Convert Button
     if st.button("Convert"):
-        if not from_currency or not to_currency:
-            st.warning("Please enter both the source and target currencies.")
+        if not base_currency or not target_currency:
+            st.warning("Please enter both the base and target currencies.")
         else:
-            rate = get_exchange_rate(from_currency, to_currency)
+            rate = get_exchange_rate(base_currency, target_currency)
             if rate:
                 converted_amount = amount * rate
-                st.success(f"{amount} {from_currency} is equal to {converted_amount:.2f} {to_currency}")
+                st.success(
+                    f"{amount} {base_currency} is equal to {converted_amount:.2f} {target_currency}."
+                )
+                if target_currency in PREDEFINED_RATES:
+                    st.write(f"Target currency: {PREDEFINED_RATES[target_currency]}")
             else:
-                st.error(f"Conversion rate not available for {from_currency} to {to_currency}.")
+                st.error(f"Exchange rate not found for {base_currency} to {target_currency}.")
 
 if __name__ == "__main__":
     main()