import { IndicatorRegistry } from '../indicators/index.js';

export function calculateSignalMarkers(candles) {
    const activeIndicators = window.getActiveIndicators?.() || [];
    const markers = [];
    
    if (!candles || candles.length < 2) {
        return markers;
    }
    
    for (const indicator of activeIndicators) {
        if (indicator.params.showMarkers === false || indicator.params.showMarkers === 'false') {
            continue;
        }
        
        console.log('[SignalMarkers] Processing indicator:', indicator.type, 'showMarkers:', indicator.params.showMarkers);
        
        // Use cache if available
        let results = indicator.cachedResults;
        if (!results || !Array.isArray(results) || results.length !== candles.length) {
            const IndicatorClass = IndicatorRegistry[indicator.type];
            if (!IndicatorClass) {
                continue;
            }
            const instance = new IndicatorClass(indicator);
            results = instance.calculate(candles);
        }
        
        if (!results || !Array.isArray(results) || results.length === 0) {
            continue;
        }
        
        const indicatorMarkers = findCrossoverMarkers(indicator, candles, results);
        markers.push(...indicatorMarkers);
    }
    
    markers.sort((a, b) => a.time - b.time);
    
    return markers;
}

function findCrossoverMarkers(indicator, candles, results) {
    const markers = [];
    const overbought = indicator.params?.overbought || 70;
    const oversold = indicator.params?.oversold || 30;
    const indicatorType = indicator.type;
    
    const buyColor = indicator.params?.markerBuyColor || '#26a69a';
    const sellColor = indicator.params?.markerSellColor || '#ef5350';
    const buyShape = indicator.params?.markerBuyShape || 'arrowUp';
    const sellShape = indicator.params?.markerSellShape || 'arrowDown';
    const buyCustom = indicator.params?.markerBuyCustom || '◭';
    const sellCustom = indicator.params?.markerSellCustom || '▼';
    
    for (let i = 1; i < results.length; i++) {
        const candle = candles[i];
        const prevCandle = candles[i - 1];
        const result = results[i];
        const prevResult = results[i - 1];
        
        if (!result || !prevResult) continue;
        
        if (indicatorType === 'rsi' || indicatorType === 'stoch') {
            const rsi = result.rsi ?? result;
            const prevRsi = prevResult.rsi ?? prevResult;
            
            if (rsi === undefined || prevRsi === undefined) continue;
            
            if (prevRsi > overbought && rsi <= overbought) {
                markers.push({
                    time: candle.time,
                    position: 'aboveBar',
                    color: sellColor,
                    shape: sellShape === 'custom' ? '' : sellShape,
                    text: sellShape === 'custom' ? sellCustom : ''
                });
            }
            
            if (prevRsi < oversold && rsi >= oversold) {
                markers.push({
                    time: candle.time,
                    position: 'belowBar',
                    color: buyColor,
                    shape: buyShape === 'custom' ? '' : buyShape,
                    text: buyShape === 'custom' ? buyCustom : ''
                });
            }
        } else if (indicatorType === 'macd') {
            const macd = result.macd ?? result.MACD;
            const signal = result.signal ?? result.signalLine;
            const prevMacd = prevResult.macd ?? prevResult.MACD;
            const prevSignal = prevResult.signal ?? prevResult.signalLine;
            
            if (macd === undefined || signal === undefined || prevMacd === undefined || prevSignal === undefined) continue;
            
            const macdAbovePrev = prevMacd > prevSignal;
            const macdAboveNow = macd > signal;
            
            if (macdAbovePrev && !macdAboveNow) {
                markers.push({
                    time: candle.time,
                    position: 'aboveBar',
                    color: sellColor,
                    shape: sellShape === 'custom' ? '' : sellShape,
                    text: sellShape === 'custom' ? sellCustom : ''
                });
            }
            
            if (!macdAbovePrev && macdAboveNow) {
                markers.push({
                    time: candle.time,
                    position: 'belowBar',
                    color: buyColor,
                    shape: buyShape === 'custom' ? '' : buyShape,
                    text: buyShape === 'custom' ? buyCustom : ''
                });
            }
        } else if (indicatorType === 'bb') {
            const upper = result.upper ?? result.upperBand;
            const lower = result.lower ?? result.lowerBand;
            
            if (upper === undefined || lower === undefined) continue;
            
            const priceAboveUpperPrev = prevCandle.close > (prevResult.upper ?? prevResult.upperBand);
            const priceAboveUpperNow = candle.close > upper;
            
            if (priceAboveUpperPrev && !priceAboveUpperNow) {
                markers.push({
                    time: candle.time,
                    position: 'aboveBar',
                    color: sellColor,
                    shape: sellShape === 'custom' ? '' : sellShape,
                    text: sellShape === 'custom' ? sellCustom : ''
                });
            }
            
            if (!priceAboveUpperPrev && priceAboveUpperNow) {
                markers.push({
                    time: candle.time,
                    position: 'belowBar',
                    color: buyColor,
                    shape: buyShape === 'custom' ? '' : buyShape,
                    text: buyShape === 'custom' ? buyCustom : ''
                });
            }
            
            const priceBelowLowerPrev = prevCandle.close < (prevResult.lower ?? prevResult.lowerBand);
            const priceBelowLowerNow = candle.close < lower;
            
            if (priceBelowLowerPrev && !priceBelowLowerNow) {
                markers.push({
                    time: candle.time,
                    position: 'belowBar',
                    color: buyColor,
                    shape: buyShape === 'custom' ? '' : buyShape,
                    text: buyShape === 'custom' ? buyCustom : ''
                });
            }
            
            if (!priceBelowLowerPrev && priceBelowLowerNow) {
                markers.push({
                    time: candle.time,
                    position: 'aboveBar',
                    color: sellColor,
                    shape: sellShape === 'custom' ? '' : sellShape,
                    text: sellShape === 'custom' ? sellCustom : ''
                });
            }
        } else if (indicatorType === 'hurst') {
            const upper = result.upper;
            const lower = result.lower;
            const prevUpper = prevResult?.upper;
            const prevLower = prevResult?.lower;
            
            if (upper === undefined || lower === undefined || 
                prevUpper === undefined || prevLower === undefined) continue;
            
            // BUY: price crosses down below lower band (was above, now below)
            if (prevCandle.close > prevLower && candle.close < lower) {
                markers.push({
                    time: candle.time,
                    position: 'belowBar',
                    color: buyColor,
                    shape: buyShape === 'custom' ? '' : buyShape,
                    text: buyShape === 'custom' ? buyCustom : ''
                });
            }
            
            // SELL: price crosses down below upper band (was above, now below)
            if (prevCandle.close > prevUpper && candle.close < upper) {
                markers.push({
                    time: candle.time,
                    position: 'aboveBar',
                    color: sellColor,
                    shape: sellShape === 'custom' ? '' : sellShape,
                    text: sellShape === 'custom' ? sellCustom : ''
                });
            }
        } else {
            const ma = result.ma ?? result;
            const prevMa = prevResult.ma ?? prevResult;
            
            if (ma === undefined || prevMa === undefined) continue;
            
            const priceAbovePrev = prevCandle.close > prevMa;
            const priceAboveNow = candle.close > ma;
            
            if (priceAbovePrev && !priceAboveNow) {
                markers.push({
                    time: candle.time,
                    position: 'aboveBar',
                    color: sellColor,
                    shape: sellShape === 'custom' ? '' : sellShape,
                    text: sellShape === 'custom' ? sellCustom : ''
                });
            }
            
            if (!priceAbovePrev && priceAboveNow) {
                markers.push({
                    time: candle.time,
                    position: 'belowBar',
                    color: buyColor,
                    shape: buyShape === 'custom' ? '' : buyShape,
                    text: buyShape === 'custom' ? buyCustom : ''
                });
            }
        }
    }
    
    return markers;
}