chore: add AGENTS.md with build, lint, test commands and style guidelines

js/indicators/moving_average.js

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+// Self-contained Moving Average indicator with SMA/EMA/RMA/WMA/VWMA support
+// 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;
+    }
+}
+
+// Moving Average math (SMA/EMA/RMA/WMA/VWMA)
+function calculateSMA(candles, period, source = 'close') {
+    const results = new Array(candles.length).fill(null);
+    let sum = 0;
+    for (let i = 0; i < candles.length; i++) {
+        sum += candles[i][source];
+        if (i >= period) sum -= candles[i - period][source];
+        if (i >= period - 1) results[i] = sum / period;
+    }
+    return results;
+}
+
+function calculateEMA(candles, period, source = 'close') {
+    const multiplier = 2 / (period + 1);
+    const results = new Array(candles.length).fill(null);
+    let ema = 0;
+    let sum = 0;
+    for (let i = 0; i < candles.length; i++) {
+        if (i < period) {
+            sum += candles[i][source];
+            if (i === period - 1) {
+                ema = sum / period;
+                results[i] = ema;
+            }
+        } else {
+            ema = (candles[i][source] - ema) * multiplier + ema;
+            results[i] = ema;
+        }
+    }
+    return results;
+}
+
+function calculateRMA(candles, period, source = 'close') {
+    const multiplier = 1 / period;
+    const results = new Array(candles.length).fill(null);
+    let rma = 0;
+    let sum = 0;
+    
+    for (let i = 0; i < candles.length; i++) {
+        if (i < period) {
+            sum += candles[i][source];
+            if (i === period - 1) {
+                rma = sum / period;
+                results[i] = rma;
+            }
+        } else {
+            rma = (candles[i][source] - rma) * multiplier + rma;
+            results[i] = rma;
+        }
+    }
+    return results;
+}
+
+function calculateWMA(candles, period, source = 'close') {
+    const results = new Array(candles.length).fill(null);
+    const weightSum = (period * (period + 1)) / 2;
+    
+    for (let i = period - 1; i < candles.length; i++) {
+        let sum = 0;
+        for (let j = 0; j < period; j++) {
+            sum += candles[i - j][source] * (period - j);
+        }
+        results[i] = sum / weightSum;
+    }
+    return results;
+}
+
+function calculateVWMA(candles, period, source = 'close') {
+    const results = new Array(candles.length).fill(null);
+    
+    for (let i = period - 1; i < candles.length; i++) {
+        let sumPV = 0;
+        let sumV = 0;
+        for (let j = 0; j < period; j++) {
+            sumPV += candles[i - j][source] * candles[i - j].volume;
+            sumV += candles[i - j].volume;
+        }
+        results[i] = sumV !== 0 ? sumPV / sumV : null;
+    }
+    return results;
+}
+
+// Signal calculation for Moving Average
+function calculateMASignal(indicator, lastCandle, prevCandle, values, prevValues) {
+    const close = lastCandle.close;
+    const prevClose = prevCandle?.close;
+    const ma = values?.ma;
+    const prevMa = prevValues?.ma;
+    
+    if (!ma && ma !== 0) return null;
+    if (prevClose === undefined || prevMa === undefined || prevMa === null) return null;
+    
+    // BUY: Price crosses UP through MA
+    if (prevClose <= prevMa && close > ma) {
+        return {
+            type: SIGNAL_TYPES.BUY,
+            strength: 80,
+            value: close,
+            reasoning: `Price crossed UP through MA`
+        };
+    } 
+    // SELL: Price crosses DOWN through MA
+    else if (prevClose >= prevMa && close < ma) {
+        return {
+            type: SIGNAL_TYPES.SELL,
+            strength: 80,
+            value: close,
+            reasoning: `Price crossed DOWN through MA`
+        };
+    }
+    
+    return null;
+}
+
+// MA Indicator class
+export class MAIndicator extends BaseIndicator {
+    constructor(config) {
+        super(config);
+        this.lastSignalTimestamp = null;
+        this.lastSignalType = null;
+    }
+
+    calculate(candles) {
+        const maType = (this.params.maType || 'SMA').toLowerCase();
+        const period = this.params.period || 44;
+        
+let maValues;
+        
+        switch (maType) {
+            case 'sma':
+                maValues = calculateSMA(candles, period, this.params.source || 'close');
+                break;
+            case 'ema':
+                maValues = calculateEMA(candles, period, this.params.source || 'close');
+                break;
+            case 'rma':
+                maValues = calculateRMA(candles, period, this.params.source || 'close');
+                break;
+            case 'wma':
+                maValues = calculateWMA(candles, period, this.params.source || 'close');
+                break;
+            case 'vwma':
+                maValues = calculateVWMA(candles, period, this.params.source || 'close');
+                break;
+            default:
+                maValues = calculateSMA(candles, period, this.params.source || 'close');
+        }
+        
+        return maValues.map(ma => ({ ma }));
+    }
+    
+    getMetadata() {
+        return {
+            name: 'MA',
+            description: 'Moving Average (SMA/EMA/RMA/WMA/VWMA)',
+            inputs: [
+                {
+                    name: 'period',
+                    label: 'Period',
+                    type: 'number',
+                    default: 44,
+                    min: 1,
+                    max: 500
+                },
+                {
+                    name: 'maType',
+                    label: 'MA Type',
+                    type: 'select',
+                    options: ['SMA', 'EMA', 'RMA', 'WMA', 'VWMA'],
+                    default: 'SMA'
+                }
+            ],
+            plots: [
+                {
+                    id: 'ma',
+                    color: '#2962ff',
+                    title: 'MA',
+                    style: 'solid',
+                    width: 1
+                }
+            ],
+            displayMode: 'overlay'
+        };
+    }
+}
+
+// Export signal function for external use
+export { calculateMASignal };