// Global variables
let currentMarketData = {};

// Translation helper for JS
const translations = {
    'en': { 'Buy': 'Buy', 'Sell': 'Sell', 'Trade': 'Trade', 'Price': 'Price', 'Amount': 'Amount' },
    'zh': { 'Buy': '买入', 'Sell': '卖出', 'Trade': '交易', 'Price': '价格', 'Amount': '数量' },
    // ... add more as needed or fetch from server
};

function getLang() {
    return document.documentElement.lang || 'en';
}

function tj(key) {
    const lang = getLang();
    return (translations[lang] && translations[lang][key]) || key;
}

// Market Data Fetching
async function fetchMarketData() {
    try {
        const resp = await fetch('api/market_api.php');
        const result = await resp.json();
        if (result.success) {
            currentMarketData = result.data;
            updateUI();
        }
    } catch (e) {
        console.error('Market API error', e);
    }
}

function updateUI() {
    // Update Trade Page if on it
    if (document.getElementById('crypto-list-container')) {
        updateTradePage();
    }
    
    // Update Market Page if on it
    if (document.getElementById('all-market-body')) {
        updateMarketPage();
    }
}

function updateTradePage() {
    const listContainer = document.getElementById('crypto-list-container');
    const search = document.getElementById('market-search')?.value.toLowerCase() || '';
    const currentSymbol = document.getElementById('current-symbol')?.value;
    
    let html = '';
    Object.keys(currentMarketData).forEach(symbol => {
        if (symbol.toLowerCase().includes(search) || currentMarketData[symbol].name.toLowerCase().includes(search)) {
            const coin = currentMarketData[symbol];
            const active = symbol === currentSymbol ? 'active' : '';
            const changeClass = coin.change >= 0 ? 'text-success' : 'text-danger';
            const changeSign = coin.change >= 0 ? '+' : '';
            
            html += `
                <div class="crypto-item ${active}" onclick="window.location.href='trade.php?symbol=${symbol}'">
                    <div class="d-flex justify-content-between align-items-center">
                        <div class="d-flex align-items-center">
                            <img src="${coin.icon}" class="crypto-icon">
                            <div>
                                <div class="fw-bold text-white small">${symbol}</div>
                                <div class="text-muted" style="font-size: 0.7rem;">${coin.name}</div>
                            </div>
                        </div>
                        <div class="text-end">
                            <div class="text-white small fw-bold">$${coin.price.toLocaleString(undefined, {minimumFractionDigits: 2})}</div>
                            <div class="${changeClass}" style="font-size: 0.7rem;">${changeSign}${coin.change.toFixed(2)}%</div>
                        </div>
                    </div>
                </div>
            `;
        }
    });
    listContainer.innerHTML = html;
    
    // Update header info for current symbol
    if (currentSymbol && currentMarketData[currentSymbol]) {
        const coin = currentMarketData[currentSymbol];
        const lastPriceEl = document.getElementById('last-price');
        if (lastPriceEl) {
            const oldPrice = parseFloat(lastPriceEl.innerText.replace(/[$,]/g, '')) || 0;
            lastPriceEl.innerText = '$' + coin.price.toLocaleString(undefined, {minimumFractionDigits: 2});
            lastPriceEl.className = coin.price >= oldPrice ? 'fw-bold text-success fs-5' : 'fw-bold text-danger fs-5';
            
            const bookPriceEl = document.getElementById('book-price');
            if (bookPriceEl) bookPriceEl.innerText = coin.price.toLocaleString(undefined, {minimumFractionDigits: 2});
        }
        
        const changeEl = document.getElementById('24h-change');
        if (changeEl) {
            changeEl.innerText = (coin.change >= 0 ? '+' : '') + coin.change.toFixed(2) + '%';
            changeEl.className = 'fw-bold ' + (coin.change >= 0 ? 'text-success' : 'text-danger');
        }
        
        // Mocking high/low/vol
        if (document.getElementById('24h-high')) document.getElementById('24h-high').innerText = '$' + (coin.price * 1.05).toLocaleString(undefined, {minimumFractionDigits: 2});
        if (document.getElementById('24h-low')) document.getElementById('24h-low').innerText = '$' + (coin.price * 0.95).toLocaleString(undefined, {minimumFractionDigits: 2});
        if (document.getElementById('24h-vol')) document.getElementById('24h-vol').innerText = (Math.random() * 500 + 100).toFixed(2) + 'M';
        if (document.getElementById('price-fiat')) document.getElementById('price-fiat').innerText = '≈ ¥' + (coin.price * 7.15).toLocaleString(undefined, {minimumFractionDigits: 2});
    }
    
    // Update order book simulation
    simulateOrderBook();
}

function simulateOrderBook() {
    const symbol = document.getElementById('current-symbol')?.value;
    if (!symbol || !currentMarketData[symbol]) return;
    
    const basePrice = currentMarketData[symbol].price;
    const askContainer = document.getElementById('order-book-asks');
    const bidContainer = document.getElementById('order-book-bids');
    
    if (!askContainer || !bidContainer) return;
    
    let askHtml = '';
    let bidHtml = '';
    
    // Asks (Red)
    for (let i = 5; i > 0; i--) {
        const price = basePrice * (1 + (i * 0.0002));
        const amount = Math.random() * 2 + 0.1;
        const depth = Math.random() * 80 + 10;
        askHtml += `
            <div class="order-book-row ask" onclick="document.getElementById('order-price').value = ${price.toFixed(2)}">
                <div class="depth-bg ask" style="width: ${depth}%"></div>
                <span class="price">${price.toFixed(2)}</span>
                <span class="amount">${amount.toFixed(4)}</span>
            </div>
        `;
    }
    
    // Bids (Green)
    for (let i = 1; i <= 5; i++) {
        const price = basePrice * (1 - (i * 0.0002));
        const amount = Math.random() * 2 + 0.1;
        const depth = Math.random() * 80 + 10;
        bidHtml += `
            <div class="order-book-row bid" onclick="document.getElementById('order-price').value = ${price.toFixed(2)}">
                <div class="depth-bg bid" style="width: ${depth}%"></div>
                <span class="price">${price.toFixed(2)}</span>
                <span class="amount">${amount.toFixed(4)}</span>
            </div>
        `;
    }
    
    askContainer.innerHTML = askHtml;
    bidContainer.innerHTML = bidHtml;
}

// Initialization
document.addEventListener('DOMContentLoaded', () => {
    fetchMarketData();
    setInterval(fetchMarketData, 3000);
    
    // Search listener
    const searchInput = document.getElementById('market-search');
    if (searchInput) {
        searchInput.addEventListener('input', updateUI);
    }
});