feat: add Hurst Bands, strategy panel, signal markers and multiple UI enhancements

src/api/dashboard/static/js/indicators/bb.js

@@ -1,6 +1,79 @@
-import { BaseIndicator } from './base.js';
+// Self-contained Bollinger Bands indicator
+// Includes math, metadata, signal calculation, and base class
 
+// Signal constants (defined in each indicator file)
+const SIGNAL_TYPES = {
+    BUY: 'buy',
+    SELL: 'sell',
+    HOLD: 'hold'
+};
+
+const SIGNAL_COLORS = {
+    buy: '#26a69a',
+    hold: '#787b86',
+    sell: '#ef5350'
+};
+
+// Base class (inline replacement for BaseIndicator)
+class BaseIndicator {
+    constructor(config) {
+        this.id = config.id;
+        this.type = config.type;
+        this.name = config.name;
+        this.params = config.params || {};
+        this.timeframe = config.timeframe || '1m';
+        this.series = [];
+        this.visible = config.visible !== false;
+        this.cachedResults = null;
+        this.cachedMeta = null;
+        this.lastSignalTimestamp = null;
+        this.lastSignalType = null;
+    }
+}
+
+// Signal calculation for Bollinger Bands
+function calculateBollingerBandsSignal(indicator, lastCandle, prevCandle, values, prevValues) {
+    const close = lastCandle.close;
+    const prevClose = prevCandle?.close;
+    const upper = values?.upper;
+    const lower = values?.lower;
+    const prevUpper = prevValues?.upper;
+    const prevLower = prevValues?.lower;
+    
+    if (!upper || !lower || prevUpper === undefined || prevLower === undefined || prevClose === undefined) {
+        return null;
+    }
+    
+    // BUY: Price crosses DOWN through lower band (reversal/bounce play)
+    if (prevClose > prevLower && close <= lower) {
+        return {
+            type: SIGNAL_TYPES.BUY,
+            strength: 70,
+            value: close,
+            reasoning: `Price crossed DOWN through lower Bollinger Band`
+        };
+    } 
+    // SELL: Price crosses UP through upper band (overextended play)
+    else if (prevClose < prevUpper && close >= upper) {
+        return {
+            type: SIGNAL_TYPES.SELL,
+            strength: 70,
+            value: close,
+            reasoning: `Price crossed UP through upper Bollinger Band`
+        };
+    }
+    
+    return null;
+}
+
+// Bollinger Bands Indicator class
 export class BollingerBandsIndicator extends BaseIndicator {
+    constructor(config) {
+        super(config);
+        this.lastSignalTimestamp = null;
+        this.lastSignalType = null;
+    }
+
     calculate(candles) {
         const period = this.params.period || 20;
         const stdDevMult = this.params.stdDev || 2;
@@ -41,3 +114,5 @@ export class BollingerBandsIndicator extends BaseIndicator {
         };
     }
 }
+
+export { calculateBollingerBandsSignal };