import apiClient from './apiClient.js';
import errorHelper from './errorHelper.js';
import { createAdvancedLineChart, createCandlestickChart, createVolumeChart } from './tradingview-charts.js';

// Cryptocurrency symbols list
const CRYPTO_SYMBOLS = [
    { symbol: 'BTC', name: 'Bitcoin' },
    { symbol: 'ETH', name: 'Ethereum' },
    { symbol: 'BNB', name: 'Binance Coin' },
    { symbol: 'SOL', name: 'Solana' },
    { symbol: 'XRP', name: 'Ripple' },
    { symbol: 'ADA', name: 'Cardano' },
    { symbol: 'DOGE', name: 'Dogecoin' },
    { symbol: 'DOT', name: 'Polkadot' },
    { symbol: 'MATIC', name: 'Polygon' },
    { symbol: 'AVAX', name: 'Avalanche' },
    { symbol: 'LINK', name: 'Chainlink' },
    { symbol: 'UNI', name: 'Uniswap' },
    { symbol: 'LTC', name: 'Litecoin' },
    { symbol: 'ATOM', name: 'Cosmos' },
    { symbol: 'ALGO', name: 'Algorand' },
    { symbol: 'TRX', name: 'Tron' },
    { symbol: 'XLM', name: 'Stellar' },
    { symbol: 'VET', name: 'VeChain' },
    { symbol: 'FIL', name: 'Filecoin' },
    { symbol: 'ETC', name: 'Ethereum Classic' },
    { symbol: 'AAVE', name: 'Aave' },
    { symbol: 'MKR', name: 'Maker' },
    { symbol: 'COMP', name: 'Compound' },
    { symbol: 'SUSHI', name: 'SushiSwap' },
    { symbol: 'YFI', name: 'Yearn Finance' },
];

class ChartLabView {
    constructor(section) {
        this.section = section;
        this.symbolInput = section.querySelector('[data-chart-symbol-input]');
        this.symbolDropdown = section.querySelector('[data-chart-symbol-dropdown]');
        this.symbolOptions = section.querySelector('[data-chart-symbol-options]');
        this.timeframeButtons = section.querySelectorAll('[data-timeframe]');
        this.indicatorButtons = section.querySelectorAll('[data-indicator]');
        this.loadButton = section.querySelector('[data-load-chart]');
        this.runAnalysisButton = section.querySelector('[data-run-analysis]');
        this.canvas = section.querySelector('#price-chart');
        this.analysisOutput = section.querySelector('[data-analysis-output]');
        this.chartTitle = section.querySelector('[data-chart-title]');
        this.chartLegend = section.querySelector('[data-chart-legend]');
        this.chart = null;
        this.symbol = 'BTC';
        this.timeframe = '7d';
        this.filteredSymbols = [...CRYPTO_SYMBOLS];
    }

    async init() {
        this.setupCombobox();
        this.bindEvents();
        await this.loadChart();
    }

    setupCombobox() {
        if (!this.symbolInput || !this.symbolOptions) return;
        
        // Populate options
        this.renderOptions();
        
        // Set initial value
        this.symbolInput.value = 'BTC - Bitcoin';
        
        // Input event for filtering
        this.symbolInput.addEventListener('input', (e) => {
            const query = e.target.value.trim().toUpperCase();
            this.filterSymbols(query);
        });
        
        // Focus event to show dropdown
        this.symbolInput.addEventListener('focus', () => {
            this.symbolDropdown.style.display = 'block';
            this.filterSymbols(this.symbolInput.value.trim().toUpperCase());
        });
        
        // Click outside to close
        document.addEventListener('click', (e) => {
            if (!this.symbolInput.contains(e.target) && !this.symbolDropdown.contains(e.target)) {
                this.symbolDropdown.style.display = 'none';
            }
        });
    }

    filterSymbols(query) {
        if (!query) {
            this.filteredSymbols = [...CRYPTO_SYMBOLS];
        } else {
            this.filteredSymbols = CRYPTO_SYMBOLS.filter(item => 
                item.symbol.includes(query) || 
                item.name.toUpperCase().includes(query)
            );
        }
        this.renderOptions();
    }

    renderOptions() {
        if (!this.symbolOptions) return;
        
        if (this.filteredSymbols.length === 0) {
            this.symbolOptions.innerHTML = '<div class="combobox-option disabled">No results found</div>';
            return;
        }
        
        this.symbolOptions.innerHTML = this.filteredSymbols.map(item => `
            <div class="combobox-option" data-symbol="${item.symbol}">
                <strong>${item.symbol}</strong>
                <span>${item.name}</span>
            </div>
        `).join('');
        
        // Add click handlers
        this.symbolOptions.querySelectorAll('.combobox-option').forEach(option => {
            if (!option.classList.contains('disabled')) {
                option.addEventListener('click', () => {
                    const symbol = option.dataset.symbol;
                    const item = CRYPTO_SYMBOLS.find(i => i.symbol === symbol);
                    if (item) {
                        this.symbol = symbol;
                        this.symbolInput.value = `${item.symbol} - ${item.name}`;
                        this.symbolDropdown.style.display = 'none';
                        this.loadChart();
                    }
                });
            }
        });
    }

    bindEvents() {
        // Timeframe buttons
        this.timeframeButtons.forEach((btn) => {
            btn.addEventListener('click', async () => {
                this.timeframeButtons.forEach((b) => b.classList.remove('active'));
                btn.classList.add('active');
                this.timeframe = btn.dataset.timeframe;
                await this.loadChart();
            });
        });
        
        // Load chart button
        if (this.loadButton) {
            this.loadButton.addEventListener('click', async (e) => {
                e.preventDefault();
                // Extract symbol from input
                const inputValue = this.symbolInput.value.trim();
                if (inputValue) {
                    const match = inputValue.match(/^([A-Z0-9]+)/);
                    if (match) {
                        this.symbol = match[1].toUpperCase();
                    } else {
                        this.symbol = inputValue.toUpperCase();
                    }
                }
                await this.loadChart();
            });
        }
        
        // Indicator buttons
        if (this.indicatorButtons.length > 0) {
            this.indicatorButtons.forEach((btn) => {
                btn.addEventListener('click', () => {
                    btn.classList.toggle('active');
                    // Don't auto-run, wait for Run Analysis button
                });
            });
        }
        
        // Run analysis button
        if (this.runAnalysisButton) {
            this.runAnalysisButton.addEventListener('click', async (e) => {
                e.preventDefault();
                await this.runAnalysis();
            });
        }
    }

    async loadChart() {
        if (!this.canvas) return;
        
        const symbol = this.symbol.trim().toUpperCase() || 'BTC';
        if (!symbol) {
            this.symbol = 'BTC';
            if (this.symbolInput) this.symbolInput.value = 'BTC - Bitcoin';
        }
        
        const container = this.canvas.closest('.chart-wrapper') || this.canvas.parentElement;
        
        // Show loading state
        if (container) {
            let loadingNode = container.querySelector('.chart-loading');
            if (!loadingNode) {
                loadingNode = document.createElement('div');
                loadingNode.className = 'chart-loading';
                container.insertBefore(loadingNode, this.canvas);
            }
            loadingNode.innerHTML = `
                <div class="loading-spinner"></div>
                <p>Loading ${symbol} chart data...</p>
            `;
        }
        
        // Update title
        if (this.chartTitle) {
            this.chartTitle.textContent = `${symbol} Price Chart (${this.timeframe})`;
        }
        
        try {
            const result = await apiClient.getPriceChart(symbol, this.timeframe);
            
            // Remove loading
            if (container) {
                const loadingNode = container.querySelector('.chart-loading');
                if (loadingNode) loadingNode.remove();
            }
            
            if (!result.ok) {
                const errorAnalysis = errorHelper.analyzeError(new Error(result.error), { symbol, timeframe: this.timeframe });
                
                if (container) {
                    let errorNode = container.querySelector('.chart-error');
                    if (!errorNode) {
                        errorNode = document.createElement('div');
                        errorNode.className = 'inline-message inline-error chart-error';
                        container.appendChild(errorNode);
                    }
                    errorNode.innerHTML = `
                        <strong>Error loading chart:</strong>
                        <p>${result.error || 'Failed to load chart data'}</p>
                        <p><small>Symbol: ${symbol} | Timeframe: ${this.timeframe}</small></p>
                    `;
                }
                return;
            }
            
            if (container) {
                const errorNode = container.querySelector('.chart-error');
                if (errorNode) errorNode.remove();
            }
            
            // Parse chart data
            const chartData = result.data || {};
            const points = chartData.data || chartData || [];
            
            if (!points || points.length === 0) {
                if (container) {
                    const errorNode = document.createElement('div');
                    errorNode.className = 'inline-message inline-warn';
                    errorNode.innerHTML = '<strong>No data available</strong><p>No price data found for this symbol and timeframe.</p>';
                    container.appendChild(errorNode);
                }
                return;
            }
            
            // Format labels and data
            const labels = points.map((point) => {
                const ts = point.time || point.timestamp || point.date;
                if (!ts) return '';
                const date = new Date(ts);
                if (this.timeframe === '1d') {
                    return date.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit' });
                }
                return date.toLocaleDateString('en-US', { month: 'short', day: 'numeric' });
            });
            
            const prices = points.map((point) => {
                const price = point.price || point.close || point.value || 0;
                return parseFloat(price) || 0;
            });
            
            // Destroy existing chart
            if (this.chart) {
                this.chart.destroy();
            }
            
            // Calculate min/max for better scaling
            const minPrice = Math.min(...prices);
            const maxPrice = Math.max(...prices);
            const priceRange = maxPrice - minPrice;
            const firstPrice = prices[0];
            const lastPrice = prices[prices.length - 1];
            const priceChange = lastPrice - firstPrice;
            const priceChangePercent = ((priceChange / firstPrice) * 100).toFixed(2);
            const isPriceUp = priceChange >= 0;
            
            // Get indicator states
            const showMA20 = this.section.querySelector('[data-indicator="MA20"]')?.checked || false;
            const showMA50 = this.section.querySelector('[data-indicator="MA50"]')?.checked || false;
            const showRSI = this.section.querySelector('[data-indicator="RSI"]')?.checked || false;
            const showVolume = this.section.querySelector('[data-indicator="Volume"]')?.checked || false;

            // Prepare price data for TradingView chart
            const priceData = points.map((point, index) => ({
                time: point.time || point.timestamp || point.date || new Date().getTime() + (index * 60000),
                price: parseFloat(point.price || point.close || point.value || 0),
                volume: parseFloat(point.volume || 0)
            }));

            // Create TradingView-style chart with indicators
            this.chart = createAdvancedLineChart('chart-lab-canvas', priceData, {
                showMA20,
                showMA50,
                showRSI,
                showVolume
            });

            // If volume is enabled, create separate volume chart
            if (showVolume && priceData.some(p => p.volume > 0)) {
                const volumeContainer = this.section.querySelector('[data-volume-chart]');
                if (volumeContainer) {
                    createVolumeChart('volume-chart-canvas', priceData);
                }
            }
            
            // Update legend with TradingView-style info
            if (this.chartLegend && prices.length > 0) {
                const currentPrice = prices[prices.length - 1];
                const firstPrice = prices[0];
                const change = currentPrice - firstPrice;
                const changePercent = ((change / firstPrice) * 100).toFixed(2);
                const isUp = change >= 0;
                
                this.chartLegend.innerHTML = `
                    <div class="legend-item">
                        <span class="legend-label">Price</span>
                        <span class="legend-value">$${currentPrice.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}</span>
                    </div>
                    <div class="legend-item">
                        <span class="legend-label">24h</span>
                        <span class="legend-value ${isUp ? 'positive' : 'negative'}">
                            <span class="legend-arrow">${isUp ? '↑' : '↓'}</span>
                            ${isUp ? '+' : ''}${changePercent}%
                        </span>
                    </div>
                    <div class="legend-item">
                        <span class="legend-label">High</span>
                        <span class="legend-value">$${maxPrice.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}</span>
                    </div>
                    <div class="legend-item">
                        <span class="legend-label">Low</span>
                        <span class="legend-value">$${minPrice.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}</span>
                    </div>
                `;
            }
        } catch (error) {
            console.error('Chart loading error:', error);
            if (container) {
                const errorNode = document.createElement('div');
                errorNode.className = 'inline-message inline-error';
                errorNode.innerHTML = `<strong>Error:</strong><p>${error.message || 'Failed to load chart'}</p>`;
                container.appendChild(errorNode);
            }
        }
    }

    async runAnalysis() {
        if (!this.analysisOutput) return;
        
        const enabledIndicators = Array.from(this.indicatorButtons)
            .filter((btn) => btn.classList.contains('active'))
            .map((btn) => btn.dataset.indicator);
        
        this.analysisOutput.innerHTML = `
            <div class="analysis-loading">
                <div class="loading-spinner"></div>
                <p>Running AI analysis with ${enabledIndicators.length > 0 ? enabledIndicators.join(', ') : 'default'} indicators...</p>
            </div>
        `;
        
        try {
            const result = await apiClient.analyzeChart(this.symbol, this.timeframe, enabledIndicators);
            
            if (!result.ok) {
                this.analysisOutput.innerHTML = `
                    <div class="inline-message inline-error">
                        <strong>Analysis Error:</strong>
                        <p>${result.error || 'Failed to run analysis'}</p>
                    </div>
                `;
                return;
            }
            
            const data = result.data || {};
            const analysis = data.analysis || data;
            
            if (!analysis) {
                this.analysisOutput.innerHTML = '<div class="inline-message inline-warn">No AI insights returned.</div>';
                return;
            }
            
            const summary = analysis.summary || analysis.narrative?.summary || 'No summary available.';
            const signals = analysis.signals || {};
            const direction = analysis.change_direction || 'N/A';
            const changePercent = analysis.change_percent ?? '—';
            const high = analysis.high ?? '—';
            const low = analysis.low ?? '—';
            
            const bullets = Object.entries(signals)
                .map(([key, value]) => {
                    const label = value?.label || value || 'n/a';
                    const score = value?.score ?? value?.value ?? '—';
                    return `<li><strong>${key.toUpperCase()}:</strong> ${label} ${score !== '—' ? `(${score})` : ''}</li>`;
                })
                .join('');
            
            this.analysisOutput.innerHTML = `
                <div class="analysis-results">
                    <div class="analysis-header">
                        <h5>Analysis Results</h5>
                        <span class="analysis-badge ${direction.toLowerCase()}">${direction}</span>
                    </div>
                    <div class="analysis-metrics">
                        <div class="metric-item">
                            <span class="metric-label">Direction</span>
                            <span class="metric-value ${direction.toLowerCase()}">${direction}</span>
                        </div>
                        <div class="metric-item">
                            <span class="metric-label">Change</span>
                            <span class="metric-value ${changePercent >= 0 ? 'positive' : 'negative'}">
                                ${changePercent >= 0 ? '+' : ''}${changePercent}%
                            </span>
                        </div>
                        <div class="metric-item">
                            <span class="metric-label">High</span>
                            <span class="metric-value">$${high}</span>
                        </div>
                        <div class="metric-item">
                            <span class="metric-label">Low</span>
                            <span class="metric-value">$${low}</span>
                        </div>
                    </div>
                    <div class="analysis-summary">
                        <h6>Summary</h6>
                        <p>${summary}</p>
                    </div>
                    ${bullets ? `
                        <div class="analysis-signals">
                            <h6>Signals</h6>
                            <ul>${bullets}</ul>
                        </div>
                    ` : ''}
                </div>
            `;
        } catch (error) {
            console.error('Analysis error:', error);
            this.analysisOutput.innerHTML = `
                <div class="inline-message inline-error">
                    <strong>Error:</strong>
                    <p>${error.message || 'Failed to run analysis'}</p>
                </div>
            `;
        }
    }
}

export default ChartLabView;