let chart, series;

export function initChart() {
    const chartDiv = document.getElementById('chart-container');
    
    chart = LightweightCharts.createChart(chartDiv, {
        layout: { background: { color: '#ffffff' }, textColor: '#000', fontFamily: 'Space Mono' },
        grid: { vertLines: { visible: false }, horzLines: { color: '#f0f0f0', style: 2 } },
        crosshair: { mode: 1, vertLine: { labelBackgroundColor: '#000' }, horzLine: { labelBackgroundColor: '#000' } },
        timeScale: { borderColor: '#000', timeVisible: true },
        rightPriceScale: { borderColor: '#000' },
    });

    series = chart.addCandlestickSeries({
        upColor: '#bef264', downColor: '#fb7185', 
        borderUpColor: '#000', borderDownColor: '#000', 
        wickUpColor: '#000', wickDownColor: '#000',
    });

    new ResizeObserver(e => {
        const r = e[0].contentRect;
        chart.applyOptions({ width: r.width, height: r.height });
    }).observe(chartDiv);

    return { chart, series };
}

export function getSeries() { return series; }

// --- NEW FEATURE: WHALE BUBBLES ON CANDLES ---
export function generateSmartMarkers(candles) {
    // 1. Calculate Volatility (High - Low) to determine what a "Large" order looks like
    // In a real app, we would use Volume, but Range is a good visual proxy for Price Action
    const ranges = candles.map(c => c.high - c.low);
    const avgRange = ranges.reduce((a, b) => a + b, 0) / ranges.length;
    const threshold = avgRange * 1.5; // Show bubble if candle is 1.5x larger than average

    const markers = [];

    candles.forEach(c => {
        const range = c.high - c.low;
        const isBigMove = range > threshold;

        // LOGIC:
        // If Candle is RED (Close < Open) and Big -> Sell Whale (Red Bubble Above)
        // If Candle is GREEN (Close > Open) and Big -> Buy Whale (Green Bubble Below)
        
        if (isBigMove) {
            const isBearish = c.close < c.open;
            
            markers.push({
                time: c.time,
                position: isBearish ? 'aboveBar' : 'belowBar',
                color: isBearish ? '#dc2626' : '#16a34a', // Deep Red or Deep Green
                shape: 'circle',
                text: isBearish ? 'Whale Sell' : 'Whale Buy', // The text inside/near bubble
                size: 2, // Making them noticeable
            });
        }
    });

    series.setMarkers(markers);
}