import { state } from './state.js';
import { getSeries, generateSmartMarkers } from './chart.js';
import { updatePrice, renderDom, spawnBubble, setStatus, updateDelta } from './ui.js';

// Main Socket Controller
export function startSocket() {
    if (state.isReplay) return;

    // Close existing connection if switching pairs
    stopSocket();

    const symbol = state.symbol.toUpperCase();
    const exchange = state.exchange;
    
    setStatus(`CONNECTING ${exchange}...`, 'warn');

    if (exchange === 'BINANCE') {
        startBinanceStream(symbol);
    } else if (exchange === 'COINBASE') {
        startCoinbaseStream(symbol);
    }
}

export function stopSocket() {
    if (state.socket) {
        state.socket.close();
        state.socket = null;
    }
}

/* ==============================================
   1. BINANCE LOGIC (USDT Pairs)
   ============================================== */
function startBinanceStream(symbol) {
    // Normalize pair (e.g., BTC -> BTCUSDT)
    const pair = `${symbol}USDT`.toLowerCase();
    const url = `wss://stream.binance.com:9443/ws/${pair}@kline_1m/${pair}@aggTrade/${pair}@depth10`;
    
    state.socket = new WebSocket(url);

    state.socket.onopen = () => {
        setStatus('● BINANCE LIVE', 'live');
    };

    state.socket.onmessage = (e) => {
        if (state.isReplay) return;
        const data = JSON.parse(e.data);
        const type = data.e;

        // --- A. KLINE (CANDLES + CHART MARKERS) ---
        if (type === 'kline') {
            handleBinanceKline(data.k);
        }

        // --- B. TRADES (SIDEBAR BUBBLES & FOOTPRINT) ---
        if (type === 'aggTrade') {
            handleBinanceTrade(data);
        }

        // --- C. DEPTH (ORDER BOOK) ---
        if (data.lastUpdateId) {
            renderDom(data.bids, data.asks);
        }
    };

    state.socket.onclose = () => setStatus('DISCONNECTED', 'warn');
}

function handleBinanceKline(k) {
    const c = {
        time: k.t / 1000,
        open: parseFloat(k.o),
        high: parseFloat(k.h),
        low: parseFloat(k.l),
        close: parseFloat(k.c)
    };

    // 1. Update the Chart Series
    getSeries().update(c);
    updatePrice(c.close);

    // 2. Sync Global State (Vital for markers)
    // We replace the last candle in history if timestamps match, or push if new.
    const lastIdx = state.candles.length - 1;
    if (lastIdx >= 0 && state.candles[lastIdx].time === c.time) {
        state.candles[lastIdx] = c;
    } else {
        state.candles.push(c);
    }

    // 3. REAL-TIME MARKER LOGIC (The new Feature)
    // "x": true means this candle just closed. That's the perfect time to check if it was a whale candle.
    if (k.x) {
        // Recalculate markers based on updated history
        generateSmartMarkers(state.candles);
    }
}

function handleBinanceTrade(data) {
    const qty = parseFloat(data.q);
    const isMaker = data.m; // Binance: maker=true implies SELL pressure
    
    // Sidebar Bubbles
    if (qty > 0.02) spawnBubble(qty, isMaker);
    
    // Delta / Footprint strip
    updateDelta(qty, isMaker);
}


/* ==============================================
   2. COINBASE LOGIC (USD Pairs)
   ============================================== */
function startCoinbaseStream(symbol) {
    const pair = `${symbol}-USD`;
    state.socket = new WebSocket('wss://ws-feed.exchange.coinbase.com');

    state.socket.onopen = () => {
        setStatus('● COINBASE LIVE', 'live');
        const msg = {
            type: "subscribe",
            product_ids: [pair],
            channels: ["level2", "matches", "ticker"]
        };
        state.socket.send(JSON.stringify(msg));
    };

    state.socket.onmessage = (e) => {
        if (state.isReplay) return;
        const data = JSON.parse(e.data);

        // Price & Synthetic Candle
        if (data.type === 'ticker') {
            handleCoinbaseTicker(data);
        }

        // Trade Bubbles
        if (data.type === 'match') {
            handleCoinbaseTrade(data);
        }
        
        // DOM (Ignoring detailed L2 updates for this simple prototype)
    };
}

let cbLastCandleTime = 0;

function handleCoinbaseTicker(data) {
    const price = parseFloat(data.price);
    const now = Math.floor(Date.now() / 1000);
    const time = now - (now % 60); // Snap to minute start

    updatePrice(price);

    // Synthesize Candle logic
    const lastIdx = state.candles.length - 1;
    
    if (state.candles.length > 0 && state.candles[lastIdx].time === time) {
        // Update Existing Current Minute
        const c = state.candles[lastIdx];
        c.close = price;
        c.high = Math.max(c.high, price);
        c.low = Math.min(c.low, price);
        getSeries().update(c);
    } else {
        // Create New Minute Candle
        const c = { time: time, open: price, high: price, low: price, close: price };
        state.candles.push(c);
        getSeries().update(c);
        
        // Previous candle definitively "closed" because time shifted. Update markers now.
        if (cbLastCandleTime !== 0 && cbLastCandleTime !== time) {
            generateSmartMarkers(state.candles);
        }
        cbLastCandleTime = time;
    }
}

function handleCoinbaseTrade(data) {
    const qty = parseFloat(data.size);
    const isSell = data.side === 'sell'; // Coinbase is straightforward
    
    if (qty > 0.01) spawnBubble(qty, isSell);
    updateDelta(qty, isSell);
}