app.py

import streamlit as st
import requests

# Set up your API key (Replace 'YOUR_API_KEY' with your actual API key)
API_KEY = "YOUR_API_KEY"  # Get your free key from ExchangeRate-API or Open Exchange Rates
API_URL = "https://open.er-api.com/v6/latest/"

# Custom CSS for better styling
st.markdown(
    """
    <style>
    .main {
        background-color: #f7f9fc;
        padding: 20px;
        border-radius: 10px;
    }
    .title {
        color: #4a90e2;
        text-align: center;
        font-size: 2.5rem;
        font-weight: bold;
        margin-bottom: 10px;
    }
    .instructions {
        text-align: center;
        font-size: 1.1rem;
        color: #555;
    }
    .convert-btn {
        background-color: #4a90e2;
        color: white;
        padding: 10px 20px;
        border-radius: 5px;
        border: none;
        cursor: pointer;
    }
    .convert-btn:hover {
        background-color: #357ABD;
    }
    </style>
    """,
    unsafe_allow_html=True,
)

# App title
st.markdown('<div class="title">💱 Currency Converter</div>', unsafe_allow_html=True)
st.markdown('<div class="instructions">Convert currencies easily with real-time exchange rates for 50+ currencies.</div>', unsafe_allow_html=True)

# Sidebar for user input
with st.sidebar:
    st.header("Conversion Settings")
    st.markdown("Select your desired options below.")
    
    # Amount input
    amount = st.number_input("Enter the amount to convert:", min_value=0.0, value=1.0, step=0.01)

    # Currency selection
    currencies = [
        "USD", "EUR", "GBP", "INR", "JPY", "CNY", "AUD", "CAD", "CHF", "ZAR",
        "SGD", "NZD", "MXN", "BRL", "RUB", "KRW", "HKD", "SEK", "NOK", "DKK",
        "THB", "IDR", "TRY", "PLN", "MYR", "PHP", "ILS", "CZK", "HUF", "AED",
        "SAR", "NGN", "EGP", "KZT", "CLP", "PKR", "BDT", "VND", "TWD", "COP",
        "ARS", "PEN", "ISK", "BGN", "RON", "HRK", "LKR", "MAD", "OMR", "QAR"
    ]
    base_currency = st.selectbox("From currency:", currencies)
    target_currency = st.selectbox("To currency:", currencies)

# Layout for results
col1, col2 = st.columns(2)

# Fetch and display conversion results
if col1.button("Convert"):
    try:
        # Fetch exchange rates
        response = requests.get(f"{API_URL}{base_currency}", params={"apiKey": API_KEY})
        data = response.json()

        # Check for valid response
        if response.status_code == 200 and "rates" in data:
            exchange_rate = data["rates"].get(target_currency)
            if exchange_rate:
                result = amount * exchange_rate
                col2.success(f"{amount} {base_currency} = {result:.2f} {target_currency}")
            else:
                col2.error("The selected target currency is not supported.")
        else:
            col2.error("Failed to fetch exchange rates. Please try again later.")
    except Exception as e:
        col2.error(f"An error occurred: {e}")

# Footer
st.markdown(
    """
    <div style="text-align: center; margin-top: 20px; color: #aaa;">
        Powered by real-time exchange rates | © 2024 Currency Converter App
    </div>
    """,
    unsafe_allow_html=True,
)