replace the mock RSI calculation with a real one

script.js

@@ -22,17 +22,43 @@ async function fetchCryptoData() {
         return [];
     }
 }
-
-// Calculate RSI (simplified for demo)
-function calculateRSI(prices) {
-    // In a real app, you would calculate RSI properly
-    // This is a simplified version for demo purposes
-    return Math.floor(Math.random() * 100);
+// Calculate RSI (Relative Strength Index)
+function calculateRSI(priceHistory, period = 14) {
+    if (!priceHistory || priceHistory.length < period + 1) return 50; // Default neutral value
+    
+    // Calculate price changes
+    const changes = [];
+    for (let i = 1; i < priceHistory.length; i++) {
+        changes.push(priceHistory[i] - priceHistory[i-1]);
+    }
+    
+    // Separate gains and losses
+    const gains = changes.map(change => change > 0 ? change : 0);
+    const losses = changes.map(change => change < 0 ? Math.abs(change) : 0);
+    
+    // Calculate average gains and losses for the period
+    let avgGain = gains.slice(0, period).reduce((sum, gain) => sum + gain, 0) / period;
+    let avgLoss = losses.slice(0, period).reduce((sum, loss) => sum + loss, 0) / period;
+    
+    // Calculate subsequent average gains/losses using smoothing
+    for (let i = period; i < changes.length; i++) {
+        avgGain = (avgGain * (period - 1) + gains[i]) / period;
+        avgLoss = (avgLoss * (period - 1) + losses[i]) / period;
+    }
+    
+    // Avoid division by zero
+    if (avgLoss === 0) return 100;
+    
+    // Calculate relative strength and RSI
+    const relativeStrength = avgGain / avgLoss;
+    const rsi = 100 - (100 / (1 + relativeStrength));
+    
+    return Math.round(rsi * 100) / 100; // Round to 2 decimal places
 }
 // Create crypto card
 function createCryptoCard(crypto) {
-    const rsi = calculateRSI(crypto.current_price);
-    const isPumping = crypto.price_change_percentage_24h > 0;
+    const rsi = calculateRSI(crypto.sparkline_in_7d.price);
+const isPumping = crypto.price_change_percentage_24h > 0;
     
     let rsiClass = 'rsi-medium';
     if (rsi < 30) rsiClass = 'rsi-low';