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static/indicator-manager.js
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199
static/indicator-manager.js
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/**
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* Creates and manages all indicator-related logic for the chart.
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* @param {Object} chart - The Lightweight Charts instance.
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* @param {Array<Object>} baseCandleData - A reference to the array holding the chart's BASE 1m candle data.
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* @returns {Object} A manager object with public methods to control indicators.
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*/
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function createIndicatorManager(chart, baseCandleData) {
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// This holds the candle data currently displayed on the chart (e.g., 5m, 10m)
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let currentAggregatedData = [];
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// Defines the 4 slots available in the UI for indicators.
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const indicatorSlots = [
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{ id: 1, cellId: 'indicator-cell-1', series: [], definition: null, params: {} },
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{ id: 2, cellId: 'indicator-cell-2', series: [], definition: null, params: {} },
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{ id: 3, cellId: 'indicator-cell-3', series: [], definition: null, params: {} },
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{ id: 4, cellId: 'indicator-cell-4', series: [], definition: null, params: {} },
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];
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// Pre-defined colors for the indicator lines.
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const colors = {
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bb1: { upper: '#FF9800', lower: '#FF9800' }, // Orange
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bb2: { upper: '#2196F3', lower: '#2196F3' }, // Blue
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bb3: { upper: '#9C27B0', lower: '#9C27B0' }, // Purple
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default: ['#FF5722', '#03A9F4', '#8BC34A', '#F44336'] // Fallback colors for other indicators
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};
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/**
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* Populates the dropdown menus in each indicator cell.
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*/
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function populateDropdowns() {
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indicatorSlots.forEach(slot => {
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const cell = document.getElementById(slot.cellId);
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if (!cell) return;
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const select = document.createElement('select');
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select.innerHTML = `<option value="">-- Select Indicator --</option>`;
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AVAILABLE_INDICATORS.forEach(ind => {
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select.innerHTML += `<option value="${ind.name}">${ind.label}</option>`;
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});
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const controlsContainer = document.createElement('div');
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controlsContainer.className = 'indicator-controls';
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cell.innerHTML = ''; // Clear previous content
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cell.appendChild(select);
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cell.appendChild(controlsContainer);
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select.addEventListener('change', (e) => {
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const indicatorName = e.target.value;
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loadIndicator(slot.id, indicatorName);
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});
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});
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}
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/**
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* Loads a new indicator into a specified slot.
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* @param {number} slotId - The ID of the slot (1-4).
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* @param {string} indicatorName - The name of the indicator to load (e.g., 'SMA').
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*/
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function loadIndicator(slotId, indicatorName) {
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const slot = indicatorSlots.find(s => s.id === slotId);
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if (!slot) return;
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// Clean up any previous indicator series in this slot
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slot.series.forEach(s => chart.removeSeries(s));
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slot.series = [];
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slot.definition = null;
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slot.params = {};
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const controlsContainer = document.querySelector(`#${slot.cellId} .indicator-controls`);
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controlsContainer.innerHTML = '';
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if (!indicatorName) return;
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const definition = AVAILABLE_INDICATORS.find(ind => ind.name === indicatorName);
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if (!definition) return;
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slot.definition = definition;
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// Create UI controls for the indicator's parameters
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definition.params.forEach(param => {
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const label = document.createElement('label');
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label.textContent = param.label || param.name;
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label.style.fontSize = '12px';
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const input = document.createElement('input');
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input.type = param.type;
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input.value = param.defaultValue;
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if (param.min !== undefined) input.min = param.min;
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if (param.step !== undefined) input.step = param.step;
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input.className = 'input-field';
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input.placeholder = param.name;
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slot.params[param.name] = input.type === 'number' ? parseFloat(input.value) : input.value;
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let debounceTimer;
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input.addEventListener('input', () => {
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clearTimeout(debounceTimer);
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debounceTimer = setTimeout(() => {
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slot.params[param.name] = input.type === 'number' ? parseFloat(input.value) : input.value;
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updateIndicator(slot.id);
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}, 500);
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});
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const controlGroup = document.createElement('div');
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controlGroup.style.display = 'flex';
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controlGroup.style.flexDirection = 'column';
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controlGroup.appendChild(label);
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controlGroup.appendChild(input);
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controlsContainer.appendChild(controlGroup);
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});
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updateIndicator(slot.id);
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}
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/**
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* Recalculates and redraws the lines for a specific indicator.
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* @param {number} slotId - The ID of the slot to update.
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*/
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function updateIndicator(slotId) {
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const slot = indicatorSlots.find(s => s.id === slotId);
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const candleDataForCalc = (slot.definition.usesBaseData) ? baseCandleData : currentAggregatedData;
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if (!slot || !slot.definition || candleDataForCalc.length === 0) {
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return;
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}
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// Clean up previous series before creating new ones
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slot.series.forEach(s => chart.removeSeries(s));
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slot.series = [];
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console.log(`Recalculating ${slot.definition.name} for slot ${slot.id} on ${candleDataForCalc.length} candles.`);
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const indicatorResult = slot.definition.calculateFull(candleDataForCalc, slot.params);
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// Handle multi-line indicators like Bollinger Bands
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if (typeof indicatorResult === 'object' && !Array.isArray(indicatorResult)) {
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Object.keys(indicatorResult).forEach(key => {
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const seriesData = indicatorResult[key];
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const bandName = key.split('_')[0];
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const bandType = key.split('_')[1];
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const series = chart.addLineSeries({
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color: colors[bandName] ? colors[bandName][bandType] : colors.default[slot.id - 1],
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lineWidth: 2,
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title: `${slot.definition.label} - ${key}`,
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lastValueVisible: false,
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priceLineVisible: false,
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});
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series.setData(seriesData);
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slot.series.push(series);
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});
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} else { // Handle single-line indicators like SMA/EMA
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const series = chart.addLineSeries({
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color: colors.default[slot.id - 1],
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lineWidth: 2,
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title: slot.definition.label,
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});
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series.setData(indicatorResult);
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slot.series.push(series);
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}
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}
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/**
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* Internal function to recalculate all active indicators.
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*/
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function recalculateAllIndicators() {
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indicatorSlots.forEach(slot => {
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if (slot.definition) {
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updateIndicator(slot.id);
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}
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});
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}
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/**
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* Sets the candle data for indicators and triggers a full recalculation.
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* @param {Array<Object>} aggregatedCandleData - The candle data for the currently selected timeframe.
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*/
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function recalculateAllAfterHistory(aggregatedCandleData) {
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currentAggregatedData = aggregatedCandleData;
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recalculateAllIndicators();
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}
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/**
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* Updates all indicators in response to a new candle closing.
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* @param {Array<Object>} aggregatedCandleData - The latest candle data for the currently selected timeframe.
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*/
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function updateIndicatorsOnNewCandle(aggregatedCandleData) {
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currentAggregatedData = aggregatedCandleData;
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recalculateAllIndicators();
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}
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// Public API for the manager
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return {
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populateDropdowns,
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recalculateAllAfterHistory,
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updateIndicatorsOnNewCandle
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};
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}
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