Update app.py

app.py

@@ -1,55 +1,85 @@
 import streamlit as st
 import requests
+import plotly.graph_objects as go
+from datetime import datetime, timedelta
+from dotenv import load_dotenv
 import os
 
-# Streamlit Page Configuration
-st.set_page_config(page_title="Currency Converter", page_icon="💱", layout="centered")
+# Load API Key from .env
+load_dotenv()
+API_KEY = os.getenv("API_KEY")  # Fetch from .env file
 
-# Title & Description
-st.title("💱 Currency Converter")
-st.write("Convert currencies in real-time using the latest exchange rates.")
+# API Endpoints
+BASE_URL = "https://api.apilayer.com/exchangerates_data/latest"
+HISTORICAL_URL = "https://api.apilayer.com/exchangerates_data/timeseries"
 
-# Get API Key Securely
-API_KEY = os.getenv("API_KEY")  # Fetch from Hugging Face Secrets
+# Streamlit Page Configuration
+st.set_page_config(page_title="💱 Currency Converter", page_icon="💰", layout="wide")
 
-# Base API URL
-BASE_URL = "https://api.apilayer.com/exchangerates_data/latest"
+# Title
+st.title("💱 Currency Converter")
 
-# Fetch List of Available Currencies
-@st.cache_data  # Cache to avoid multiple API calls
+# Fetch available currencies
+@st.cache_data
 def get_currencies():
     url = f"{BASE_URL}?apikey={API_KEY}"
     response = requests.get(url).json()
-    
     if "rates" in response:
-        return sorted(response["rates"].keys())  # Sorted list of currencies
-    else:
-        st.error("⚠️ Unable to fetch currency list. Check API key.")
-        return []
+        return sorted(response["rates"].keys())
+    return ["USD", "INR", "EUR", "GBP", "CAD"]  # Default if API fails
 
-# Load Currency Options
 currencies = get_currencies()
 
-# User Inputs
-amount = st.number_input("Enter Amount:", min_value=0.01, step=0.01)
-from_currency = st.selectbox("From Currency", currencies, index=currencies.index("USD"))
-to_currency = st.selectbox("To Currency", currencies, index=currencies.index("INR"))
+# Input Section
+col1, col2 = st.columns(2)
+with col1:
+    amount = st.number_input("Enter Amount:", min_value=0.01, step=0.01)
+with col2:
+    from_currency = st.selectbox("From Currency", currencies, index=currencies.index("USD"))
+    to_currency = st.selectbox("To Currency", currencies, index=currencies.index("INR"))
 
-# Conversion Function
+# Function to Convert Currency
 def convert_currency(amount, from_currency, to_currency):
     url = f"{BASE_URL}?base={from_currency}&apikey={API_KEY}"
     response = requests.get(url).json()
-
     if "rates" in response and to_currency in response["rates"]:
-        converted_amount = amount * response["rates"][to_currency]
-        return f"{amount} {from_currency} = {converted_amount:.2f} {to_currency}"
+        exchange_rate = response["rates"][to_currency]
+        converted_amount = amount * exchange_rate
+        return converted_amount, exchange_rate
     else:
-        return "⚠️ Error: Unable to fetch exchange rates."
+        return None, None
+
+# Fetch Historical Data
+def get_historical_data(from_currency, to_currency):
+    end_date = datetime.today().strftime("%Y-%m-%d")
+    start_date = (datetime.today() - timedelta(days=30)).strftime("%Y-%m-%d")
+    
+    url = f"{HISTORICAL_URL}?apikey={API_KEY}&start_date={start_date}&end_date={end_date}&base={from_currency}&symbols={to_currency}"
+    response = requests.get(url).json()
+
+    if "rates" in response:
+        dates = sorted(response["rates"].keys())  # Sort dates
+        rates = [response["rates"][date][to_currency] for date in dates]
+        return dates, rates
+    return [], []
 
 # Convert Button
-if st.button("Convert"):
+if st.button("Convert Now"):
     if from_currency == to_currency:
-        st.warning("Please select different currencies! 🚀")
+        st.warning("⚠️ Please select different currencies!")
     else:
-        result = convert_currency(amount, from_currency, to_currency)
-        st.success(f"**{result}**")  # Bold Black Output
+        converted_amount, exchange_rate = convert_currency(amount, from_currency, to_currency)
+        if converted_amount:
+            # Black Font Output
+            st.write(f"### 💵 {amount} {from_currency} = **{converted_amount:.2f} {to_currency}**")
+            st.write(f"#### 📈 Exchange Rate: **{exchange_rate:.4f}**")
+
+            # Display Graph
+            dates, rates = get_historical_data(from_currency, to_currency)
+            if dates:
+                fig = go.Figure()
+                fig.add_trace(go.Scatter(x=dates, y=rates, mode="lines+markers", name=f"{from_currency} to {to_currency}"))
+                fig.update_layout(title=f"{from_currency} to {to_currency} Exchange Rate (Last 30 Days)", xaxis_title="Date", yaxis_title="Exchange Rate")
+                st.plotly_chart(fig)
+        else:
+            st.error("❌ Error: Unable to fetch exchange rates.")