import { INTERVALS, COLORS } from '../core/index.js';

export class TradingDashboard {
    constructor() {
        this.chart = null;
        this.candleSeries = null;
        this.currentInterval = '1d';
        this.intervals = INTERVALS;
        this.allData = new Map();
        this.isLoading = false;
        this.hasInitialLoad = false;
        this.taData = null;
        
        this.init();
    }
    
    init() {
        this.createTimeframeButtons();
        this.initChart();
        this.initEventListeners();
        this.loadInitialData();
        
        setInterval(() => {
            this.loadNewData();
            this.loadStats();
            if (new Date().getSeconds() < 15) this.loadTA();
        }, 10000);
    }

    isAtRightEdge() {
        const timeScale = this.chart.timeScale();
        const visibleRange = timeScale.getVisibleLogicalRange();
        if (!visibleRange) return true;
        
        const data = this.candleSeries.data();
        if (!data || data.length === 0) return true;
        
        return visibleRange.to >= data.length - 5;
    }
    
    createTimeframeButtons() {
        const container = document.getElementById('timeframeContainer');
        container.innerHTML = '';
        this.intervals.forEach(interval => {
            const btn = document.createElement('button');
            btn.className = 'timeframe-btn';
            btn.dataset.interval = interval;
            btn.textContent = interval;
            if (interval === this.currentInterval) {
                btn.classList.add('active');
            }
            btn.addEventListener('click', () => this.switchTimeframe(interval));
            container.appendChild(btn);
        });
    }
    
    initChart() {
        const chartContainer = document.getElementById('chart');
        
        this.chart = LightweightCharts.createChart(chartContainer, {
            layout: {
                background: { color: COLORS.tvBg },
                textColor: COLORS.tvText,
                panes: {
                    background: { color: '#1e222d' },
                    separatorColor: '#2a2e39',
                    separatorHoverColor: '#363c4e',
                    enableResize: true
                }
            },
            grid: {
                vertLines: { color: '#363d4e' },
                horzLines: { color: '#363d4e' },
            },
            rightPriceScale: {
                borderColor: '#363d4e',
                autoScale: true,
            },
            timeScale: {
                borderColor: '#363d4e',
                timeVisible: true,
                secondsVisible: false,
                rightOffset: 12,
                barSpacing: 10,
            },
            handleScroll: {
                vertTouchDrag: false,
            },
        });
        
        this.candleSeries = this.chart.addSeries(LightweightCharts.CandlestickSeries, {
            upColor: '#ff9800',
            downColor: '#ff9800',
            borderUpColor: '#ff9800',
            borderDownColor: '#ff9800',
            wickUpColor: '#ff9800',
            wickDownColor: '#ff9800',
            lastValueVisible: false,
            priceLineVisible: false,
        }, 0);
        
        this.currentPriceLine = this.candleSeries.createPriceLine({
            price: 0,
            color: '#26a69a',
            lineWidth: 1,
            lineStyle: LightweightCharts.LineStyle.Dotted,
            axisLabelVisible: true,
            title: '',
        });
        
        this.initPriceScaleControls();
        this.initNavigationControls();
        
        this.chart.timeScale().subscribeVisibleLogicalRangeChange(this.onVisibleRangeChange.bind(this));
        
        window.addEventListener('resize', () => {
            this.chart.applyOptions({
                width: chartContainer.clientWidth,
                height: chartContainer.clientHeight,
            });
        });

        document.addEventListener('visibilitychange', () => {
            if (document.visibilityState === 'visible') {
                this.loadNewData();
                this.loadTA();
            }
        });
        window.addEventListener('focus', () => {
            this.loadNewData();
            this.loadTA();
        });
    }
    
    initPriceScaleControls() {
        const btnAutoScale = document.getElementById('btnAutoScale');
        const btnLogScale = document.getElementById('btnLogScale');
        
        if (!btnAutoScale || !btnLogScale) return;
        
        this.priceScaleState = {
            autoScale: true,
            logScale: false
        };
        
        btnAutoScale.addEventListener('click', () => {
            this.priceScaleState.autoScale = !this.priceScaleState.autoScale;
            btnAutoScale.classList.toggle('active', this.priceScaleState.autoScale);
            
            this.candleSeries.priceScale().applyOptions({
                autoScale: this.priceScaleState.autoScale
            });
            
            console.log('Auto Scale:', this.priceScaleState.autoScale ? 'ON' : 'OFF');
        });
        
        btnLogScale.addEventListener('click', () => {
            this.priceScaleState.logScale = !this.priceScaleState.logScale;
            btnLogScale.classList.toggle('active', this.priceScaleState.logScale);
            
            let currentPriceRange = null;
            let currentTimeRange = null;
            if (!this.priceScaleState.autoScale) {
                try {
                    currentPriceRange = this.candleSeries.priceScale().getVisiblePriceRange();
                } catch (e) {
                    console.log('Could not get price range');
                }
            }
            try {
                currentTimeRange = this.chart.timeScale().getVisibleLogicalRange();
            } catch (e) {
                console.log('Could not get time range');
            }
            
            this.candleSeries.priceScale().applyOptions({
                mode: this.priceScaleState.logScale ? LightweightCharts.PriceScaleMode.Logarithmic : LightweightCharts.PriceScaleMode.Normal
            });
            
            this.chart.applyOptions({});
            
            setTimeout(() => {
                if (currentTimeRange) {
                    try {
                        this.chart.timeScale().setVisibleLogicalRange(currentTimeRange);
                    } catch (e) {
                        console.log('Could not restore time range');
                    }
                }
                
                if (!this.priceScaleState.autoScale && currentPriceRange) {
                    try {
                        this.candleSeries.priceScale().setVisiblePriceRange(currentPriceRange);
                    } catch (e) {
                        console.log('Could not restore price range');
                    }
                }
            }, 100);
            
            console.log('Log Scale:', this.priceScaleState.logScale ? 'ON' : 'OFF');
        });
        
        document.addEventListener('keydown', (e) => {
            if (e.key === 'a' || e.key === 'A') {
                if (e.target.tagName !== 'INPUT') {
                    btnAutoScale.click();
                }
            }
        });
    }
    
    initNavigationControls() {
        const chartWrapper = document.getElementById('chartWrapper');
        const navLeft = document.getElementById('navLeft');
        const navRight = document.getElementById('navRight');
        const navRecent = document.getElementById('navRecent');
        
        if (!chartWrapper || !navLeft || !navRight || !navRecent) return;
        
        chartWrapper.addEventListener('mousemove', (e) => {
            const rect = chartWrapper.getBoundingClientRect();
            const distanceFromBottom = rect.bottom - e.clientY;
            chartWrapper.classList.toggle('show-nav', distanceFromBottom < 30);
        });
        
        chartWrapper.addEventListener('mouseleave', () => {
            chartWrapper.classList.remove('show-nav');
        });
        
        navLeft.addEventListener('click', () => this.navigateLeft());
        navRight.addEventListener('click', () => this.navigateRight());
        navRecent.addEventListener('click', () => this.navigateToRecent());
    }
    
    navigateLeft() {
        const visibleRange = this.chart.timeScale().getVisibleLogicalRange();
        if (!visibleRange) return;
        
        const visibleBars = visibleRange.to - visibleRange.from;
        const shift = visibleBars * 0.8;
        const newFrom = visibleRange.from - shift;
        const newTo = visibleRange.to - shift;
        
        this.chart.timeScale().setVisibleLogicalRange({ from: newFrom, to: newTo });
    }
    
    navigateRight() {
        const visibleRange = this.chart.timeScale().getVisibleLogicalRange();
        if (!visibleRange) return;
        
        const visibleBars = visibleRange.to - visibleRange.from;
        const shift = visibleBars * 0.8;
        const newFrom = visibleRange.from + shift;
        const newTo = visibleRange.to + shift;
        
        this.chart.timeScale().setVisibleLogicalRange({ from: newFrom, to: newTo });
    }
    
    navigateToRecent() {
        this.chart.timeScale().scrollToRealTime();
    }
    
    initEventListeners() {
        document.addEventListener('keydown', (e) => {
            if (e.target.tagName === 'INPUT' || e.target.tagName === 'BUTTON') return;
            
            const shortcuts = {
                '1': '1m', '2': '3m', '3': '5m', '4': '15m', '5': '30m', '7': '37m',
                '6': '1h', '8': '4h', '9': '8h', '0': '12h',
                'd': '1d', 'D': '1d', 'w': '1w', 'W': '1w', 'm': '1M', 'M': '1M'
            };
            
            if (shortcuts[e.key]) {
                this.switchTimeframe(shortcuts[e.key]);
            }
            
            if (e.key === 'ArrowLeft') {
                this.navigateLeft();
            } else if (e.key === 'ArrowRight') {
                this.navigateRight();
            } else if (e.key === 'ArrowUp') {
                this.navigateToRecent();
            }
        });
    }
    
async loadInitialData() {
        await Promise.all([
            this.loadData(1000, true),
            this.loadStats()
        ]);
        this.hasInitialLoad = true;
        this.loadTA();
    }
    
    async loadData(limit = 1000, fitToContent = false) {
        if (this.isLoading) return;
        this.isLoading = true;
        
        try {
            const visibleRange = this.chart.timeScale().getVisibleLogicalRange();
            
            const response = await fetch(`/api/v1/candles?symbol=BTC&interval=${this.currentInterval}&limit=${limit}`);
            const data = await response.json();
            
            if (data.candles && data.candles.length > 0) {
                const chartData = data.candles.reverse().map(c => ({
                    time: Math.floor(new Date(c.time).getTime() / 1000),
                    open: parseFloat(c.open),
                    high: parseFloat(c.high),
                    low: parseFloat(c.low),
                    close: parseFloat(c.close),
                    volume: parseFloat(c.volume || 0)
                }));
                
                const existingData = this.allData.get(this.currentInterval) || [];
                const mergedData = this.mergeData(existingData, chartData);
                this.allData.set(this.currentInterval, mergedData);
                
                this.candleSeries.setData(mergedData);
                
                if (fitToContent) {
                    this.chart.timeScale().scrollToRealTime();
                } else if (visibleRange) {
                    this.chart.timeScale().setVisibleLogicalRange(visibleRange);
                }
                
                const latest = mergedData[mergedData.length - 1];
                this.updateStats(latest);
            }
        } catch (error) {
            console.error('Error loading data:', error);
        } finally {
            this.isLoading = false;
        }
    }
    
    async loadNewData() {
        if (!this.hasInitialLoad || this.isLoading) return;
        
        try {
            const response = await fetch(`/api/v1/candles?symbol=BTC&interval=${this.currentInterval}&limit=50`);
            const data = await response.json();
            
            if (data.candles && data.candles.length > 0) {
                const atEdge = this.isAtRightEdge();
                
                const currentSeriesData = this.candleSeries.data();
                const lastTimestamp = currentSeriesData.length > 0 
                    ? currentSeriesData[currentSeriesData.length - 1].time 
                    : 0;

                const chartData = data.candles.reverse().map(c => ({
                    time: Math.floor(new Date(c.time).getTime() / 1000),
                    open: parseFloat(c.open),
                    high: parseFloat(c.high),
                    low: parseFloat(c.low),
                    close: parseFloat(c.close),
                    volume: parseFloat(c.volume || 0)
                }));
                
                chartData.forEach(candle => {
                    if (candle.time >= lastTimestamp) {
                        this.candleSeries.update(candle);
                    }
                });
                
                const existingData = this.allData.get(this.currentInterval) || [];
                this.allData.set(this.currentInterval, this.mergeData(existingData, chartData));
                
                if (atEdge) {
                    this.chart.timeScale().scrollToRealTime();
                }
                
                const latest = chartData[chartData.length - 1];
                this.updateStats(latest);
            }
        } catch (error) {
            console.error('Error loading new data:', error);
        }
    }
    
    mergeData(existing, newData) {
        const dataMap = new Map();
        existing.forEach(c => dataMap.set(c.time, c));
        newData.forEach(c => dataMap.set(c.time, c));
        return Array.from(dataMap.values()).sort((a, b) => a.time - b.time);
    }
    
    onVisibleRangeChange() {
        if (!this.hasInitialLoad || this.isLoading) {
            return;
        }
        
        const visibleRange = this.chart.timeScale().getVisibleLogicalRange();
        if (!visibleRange) {
            return;
        }
        
        const data = this.candleSeries.data();
        if (!data || data.length === 0) {
            return;
        }
        
        const visibleBars = Math.ceil(visibleRange.to - visibleRange.from);
        const bufferSize = visibleBars * 2;
        const refillThreshold = bufferSize * 0.8;
        const barsFromLeft = Math.floor(visibleRange.from);
        
        if (barsFromLeft < refillThreshold) {
            console.log(`Buffer low (${barsFromLeft} < ${refillThreshold.toFixed(0)}), silently prefetching ${bufferSize} candles...`);
            const oldestCandle = data[0];
            if (oldestCandle) {
                this.loadHistoricalData(oldestCandle.time, bufferSize);
            }
        }
    }
    
    async loadHistoricalData(beforeTime, limit = 1000) {
        if (this.isLoading) {
            return;
        }
        this.isLoading = true;
        
        try {
            const endTime = new Date((beforeTime - 1) * 1000);
            
            const response = await fetch(
                `/api/v1/candles?symbol=BTC&interval=${this.currentInterval}&end=${endTime.toISOString()}&limit=${limit}`
            );
            
            if (!response.ok) {
                throw new Error(`HTTP error! status: ${response.status}`);
            }
            
            const data = await response.json();
            
            if (data.candles && data.candles.length > 0) {
                const chartData = data.candles.reverse().map(c => ({
                    time: Math.floor(new Date(c.time).getTime() / 1000),
                    open: parseFloat(c.open),
                    high: parseFloat(c.high),
                    low: parseFloat(c.low),
                    close: parseFloat(c.close),
                    volume: parseFloat(c.volume || 0)
                }));
                
                const existingData = this.allData.get(this.currentInterval) || [];
                const mergedData = this.mergeData(existingData, chartData);
                this.allData.set(this.currentInterval, mergedData);
                
                this.candleSeries.setData(mergedData);
                
                // Recalculate indicators with the expanded dataset
                window.drawIndicatorsOnChart?.();
                
                console.log(`Prefetched ${chartData.length} candles, total: ${mergedData.length}`);
            } else {
                console.log('No more historical data available');
            }
        } catch (error) {
            console.error('Error loading historical data:', error);
        } finally {
            this.isLoading = false;
        }
    }
    
async loadTA() {
        if (!this.hasInitialLoad) {
            const time = new Date().toLocaleTimeString();
            document.getElementById('taContent').innerHTML = `<div class="ta-loading">Loading technical analysis... ${time}</div>`;
            return;
        }
        
        try {
            const response = await fetch(`/api/v1/ta?symbol=BTC&interval=${this.currentInterval}`);
            const data = await response.json();
            
            if (data.error) {
                document.getElementById('taContent').innerHTML = `<div class="ta-error">${data.error}</div>`;
                return;
            }
            
            this.taData = data;
            this.renderTA();
        } catch (error) {
            console.error('Error loading TA:', error);
            document.getElementById('taContent').innerHTML = '<div class="ta-error">Failed to load technical analysis. Please check if the database has candle data.</div>';
        }
    }
    
    renderTA() {
        if (!this.taData || this.taData.error) {
            document.getElementById('taContent').innerHTML = `<div class="ta-error">${this.taData?.error || 'No data available'}</div>`;
            return;
        }
        
        const data = this.taData;
        const trendClass = data.trend.direction.toLowerCase();
        const signalClass = data.trend.signal.toLowerCase();
        
        const ma44Change = data.moving_averages.price_vs_ma44;
        const ma125Change = data.moving_averages.price_vs_ma125;
        
        document.getElementById('taInterval').textContent = this.currentInterval.toUpperCase();
        document.getElementById('taLastUpdate').textContent = new Date().toLocaleTimeString();
        
        document.getElementById('taContent').innerHTML = `
            <div class="ta-section">
                <div class="ta-section-title">Trend Analysis</div>
                <div class="ta-trend ${trendClass}">
                    ${data.trend.direction} ${trendClass === 'bullish' ? '↑' : trendClass === 'bearish' ? '↓' : '→'}
                </div>
                <div class="ta-strength">${data.trend.strength}</div>
                <span class="ta-signal ${signalClass}">${data.trend.signal}</span>
            </div>
            
            <div class="ta-section">
                <div class="ta-section-title">Moving Averages</div>
                <div class="ta-ma-row">
                    <span class="ta-ma-label">MA 44</span>
                    <span class="ta-ma-value">
                        ${data.moving_averages.ma_44 ? data.moving_averages.ma_44.toFixed(2) : 'N/A'}
                        ${ma44Change !== null ? `<span class="ta-ma-change ${ma44Change >= 0 ? 'positive' : 'negative'}">${ma44Change >= 0 ? '+' : ''}${ma44Change.toFixed(1)}%</span>` : ''}
                    </span>
                </div>
                <div class="ta-ma-row">
                    <span class="ta-ma-label">MA 125</span>
                    <span class="ta-ma-value">
                        ${data.moving_averages.ma_125 ? data.moving_averages.ma_125.toFixed(2) : 'N/A'}
                        ${ma125Change !== null ? `<span class="ta-ma-change ${ma125Change >= 0 ? 'positive' : 'negative'}">${ma125Change >= 0 ? '+' : ''}${ma125Change.toFixed(1)}%</span>` : ''}
                    </span>
                </div>
            </div>
            
            <div class="ta-section">
                <div class="ta-section-title">Indicators</div>
                <div id="indicatorList" class="indicator-list"></div>
            </div>
            
            <div class="ta-section" id="indicatorConfigPanel">
                <div class="ta-section-title">Configuration</div>
                <div id="configForm" style="margin-top: 8px;"></div>
                <div style="display: flex; gap: 8px; margin-top: 12px;" id="configButtons">
                    <button class="ta-btn" onclick="applyIndicatorConfig()" style="flex: 1; font-size: 11px; background: var(--tv-blue); color: white; border: none;">Apply</button>
                    <button class="ta-btn" onclick="removeIndicator()" style="flex: 1; font-size: 11px; border-color: var(--tv-red); color: var(--tv-red);">Remove</button>
                </div>
            </div>
        `;
        
        window.renderIndicatorList?.();
    }
    
    async loadStats() {
        try {
            const response = await fetch('/api/v1/stats?symbol=BTC');
            this.statsData = await response.json();
        } catch (error) {
            console.error('Error loading stats:', error);
        }
    }
    
    updateStats(candle) {
        const price = candle.close;
        const isUp = candle.close >= candle.open;
        
        if (this.currentPriceLine) {
            this.currentPriceLine.applyOptions({
                price: price,
                color: isUp ? '#26a69a' : '#ef5350',
            });
        }
        
        document.getElementById('currentPrice').textContent = price.toFixed(2);
        
        if (this.statsData) {
            const change = this.statsData.change_24h;
            document.getElementById('currentPrice').className = 'stat-value ' + (change >= 0 ? 'positive' : 'negative');
            document.getElementById('priceChange').textContent = (change >= 0 ? '+' : '') + change.toFixed(2) + '%';
            document.getElementById('priceChange').className = 'stat-value ' + (change >= 0 ? 'positive' : 'negative');
            document.getElementById('dailyHigh').textContent = this.statsData.high_24h.toFixed(2);
            document.getElementById('dailyLow').textContent = this.statsData.low_24h.toFixed(2);
}
    }
    
    switchTimeframe(interval) {
        if (!this.intervals.includes(interval) || interval === this.currentInterval) return;
        
        this.currentInterval = interval;
        this.hasInitialLoad = false;
        
        document.querySelectorAll('.timeframe-btn').forEach(btn => {
            btn.classList.toggle('active', btn.dataset.interval === interval);
        });
        
        this.allData.delete(interval);
        this.loadInitialData();
        // Don't reload TA on timeframe switch - let user refresh manually
        
        window.clearSimulationResults?.();
        window.updateTimeframeDisplay?.();
    }
}

export function refreshTA() {
    if (window.dashboard) {
        const time = new Date().toLocaleTimeString();
        document.getElementById('taContent').innerHTML = `<div class="ta-loading">Refreshing... ${time}</div>`;
        window.dashboard.loadTA();
    }
}

export function openAIAnalysis() {
    const symbol = 'BTC';
    const interval = window.dashboard?.currentInterval || '1d';
    const prompt = `Analyze Bitcoin (${symbol}) ${interval} chart. Current trend, support/resistance levels, and trading recommendation. Technical indicators: MA44, MA125.`;
    
    const geminiUrl = `https://gemini.google.com/app?prompt=${encodeURIComponent(prompt)}`;
    window.open(geminiUrl, '_blank');
}