/* ============================================================
   Exchange Monitor Dashboard — Frontend Logic v3 (P3)
   ============================================================ */

(function() {
'use strict';

// ---- DOM refs ----
const $ = id => document.getElementById(id);

const els = {
  clock:        $('clock'),
  connStatus:   $('conn-status'),
  connDetail:   $('conn-detail'),
  pricesAge:    $('prices-age'),
  priceBody:    $('price-body'),
  arbBody:      $('arb-body'),
  posBody:      $('positions-body'),
  tradesBody:   $('trades-body'),
  statTotal:    $('stat-total'),
  statConv:     $('stat-converged'),
  statDiv:      $('stat-diverged'),
  statFlat:     $('stat-flat'),
  statPos:      $('stat-positions'),
  statCoins:    $('stat-coins'),
};

// ---- Clock ----
function updateClock() {
  const now = new Date();
  els.clock.textContent = now.toLocaleTimeString('zh-CN', { hour12: false });
}
setInterval(updateClock, 1000);
updateClock();

const EXCHANGES = ['HyperLiquid', 'Bitget'];
const COINS = []; // populated dynamically from SSE data

function formatPrice(p) {
  if (p == null || p <= 0) return '-';
  if (p >= 100) return p.toFixed(2);
  if (p >= 1) return p.toFixed(4);
  return p.toFixed(6);
}

function priceClass(last, cur) {
  if (last == null || cur == null) return '';
  return cur > last ? 'text-green' : cur < last ? 'text-red' : '';
}

function pnlClass(val) {
  if (val == null) return '';
  return val > 0 ? 'text-green' : val < 0 ? 'text-red' : '';
}

const priceCache = {};

// ---- SSE Connection ----
let eventSource = null;

function connectSSE() {
  if (eventSource) eventSource.close();

  eventSource = new EventSource('/events');

  eventSource.addEventListener('connected', () => {
    els.connStatus.textContent = '● 已连接';
    els.connStatus.className = 'status-online';
  });

  eventSource.onerror = () => {
    els.connStatus.textContent = '● 已断开 (重连中...)';
    els.connStatus.className = 'status-offline';
    setTimeout(connectSSE, 3000);
  };

  eventSource.onmessage = (e) => {
    try {
      const msg = JSON.parse(e.data);
      const handler = eventHandlers[msg.event];
      if (handler) handler(msg.data);
    } catch(err) {
      // ignore parse errors
    }
  };
}

// ---- Event Handlers ----
const eventHandlers = {};

eventHandlers.prices = (prices) => {
  if (!prices || prices.length === 0) return;

  // Dynamically populate COINS list on first data
  if (COINS.length === 0) {
    for (const row of prices) {
      COINS.push(row.coin);
    }
  }

  let html = '';
  let coinsOnline = 0;

  for (const coin of COINS) {
    const row = prices.find(p => p.coin === coin);
    if (!row) {
      html += `<tr><td>${coin}</td>${EXCHANGES.map(() => '<td class="text-dim">-</td>').join('')}<td class="text-dim">-</td></tr>`;
      continue;
    }
    coinsOnline++;

    const cells = EXCHANGES.map(ex => {
      const p = row[ex];
      const key = coin + '.' + ex;
      const prev = priceCache[key];
      const curP = p || 0;
      const cls = prev ? priceClass(prev.last, curP) : '';

      if (prev) {
        prev.last = curP;
      } else {
        priceCache[key] = { last: curP };
      }

      let display = formatPrice(p);
      return `<td class="${cls}">${display}</td>`;
    });

    // P3-2: Add spread column
    const spread = row['bg_hl_spread'];
    const spreadCls = spread > 0.2 ? 'text-green' : spread < -0.2 ? 'text-red' : '';
    const spreadStr = spread != null ? spread.toFixed(4) + '%' : '-';

    html += `<tr><td><strong>${coin}</strong></td>${cells.join('')}<td class="${spreadCls}">${spreadStr}</td></tr>`;
  }

  els.priceBody.innerHTML = html;
  els.pricesAge.textContent = new Date().toLocaleTimeString('zh-CN', { hour12: false });
};

eventHandlers.arb = (opps) => {
  if (!opps || opps.length === 0) {
    els.arbBody.innerHTML = '<tr><td colspan="5" class="text-dim">暂无套利机会</td></tr>';
    return;
  }

  const html = opps.slice(0, 10).map(opp => {
    const cls = opp.net_profit > 0.10 ? 'text-green' : opp.net_profit > 0.05 ? 'text-yellow' : '';
    return `<tr>
      <td>${opp.coin}</td>
      <td>${opp.direction}</td>
      <td class="text-right">${formatPrice(opp.buy_price)}</td>
      <td class="text-right">${formatPrice(opp.sell_price)}</td>
      <td class="text-right ${cls}"><strong>${opp.net_profit.toFixed(4)}</strong></td>
    </tr>`;
  }).join('');

  els.arbBody.innerHTML = html;
};

// P3-3: Positions with live PnL — sorted by time (oldest first)
eventHandlers.positions = (positions) => {
  if (!positions || positions.length === 0) {
    els.posBody.innerHTML = '<tr><td colspan="8" class="text-dim">无持仓</td></tr>';
    return;
  }

  // Sort by coin name (stable, deterministic)
  const sorted = [...positions].sort((a, b) => a.coin.localeCompare(b.coin));

  const html = sorted.map(p => {
    const pnl = p.pnl_est;
    const pnlStr = pnl != null ? pnl.toFixed(4) + '%' : '-';
    const curSpread = p.current_spread != null ? p.current_spread.toFixed(4) + '%' : '-';
    return `<tr>
      <td><strong>${p.coin}</strong></td>
      <td>${p.direction}</td>
      <td class="text-right">$${p.amount_usd.toFixed(0)}</td>
      <td class="text-right">${p.entry_spread.toFixed(4)}%</td>
      <td class="text-right">${curSpread}</td>
      <td class="text-right ${pnlClass(pnl)}"><strong>${pnlStr}</strong></td>
      <td class="text-right">${p.scales}</td>
      <td>${p.duration}</td>
    </tr>`;
  }).join('');

  els.posBody.innerHTML = html;
};

// P3-5: Connection status in stats
eventHandlers.stats = (stats) => {
  els.statTotal.textContent = stats.total_trades || 0;
  els.statConv.textContent = stats.converged || 0;
  els.statDiv.textContent = stats.diverged || 0;
  els.statFlat.textContent = stats.flat || 0;
  els.statPos.textContent = stats.open_positions || 0;
  els.statCoins.textContent = stats.coins || 0;

  // Detailed PnL stats
  if (stats.detail) {
    const d = stats.detail;
    // Total PnL: show both USD and percentage of capital
    const usdStr = (d.total_pnl_usd != null) ? '$' + d.total_pnl_usd.toFixed(2) : '—';
    const pctStr = (d.capital_pnl != null) ? d.capital_pnl.toFixed(4) + '%' : '—';
    $('stat-total-pnl').textContent = usdStr + ' (' + pctStr + ')';
    $('stat-total-pnl').className = pnlClass(d.capital_pnl);
    $('stat-capital').textContent   = (stats.capital != null) ? '$' + stats.capital.toFixed(0) : '—';
    $('stat-win-rate').textContent = (d.win_rate != null)  ? d.win_rate.toFixed(1) + '%' : '—';
    $('stat-max-profit').textContent = (d.max_profit != null) ? '+' + d.max_profit.toFixed(2) + '%' : '—';
    $('stat-max-loss').textContent = (d.max_loss != null)  ? d.max_loss.toFixed(2) + '%' : '—';
    $('stat-avg-dur').textContent  = d.avg_dur || '—';
  }

  // Connection status dots
  if (stats.connections) {
    const dots = Object.entries(stats.connections).map(([ex, status]) => {
      const color = status === 'online' ? '#3fb950' : status === 'stale' ? '#d29922' : '#f85149';
      return `<span style="color:${color}">●</span> ${ex}`;
    }).join(' ');
    els.connDetail.innerHTML = dots;
  }

  // Blacklist — stale spread coins
  if (stats.blacklist && stats.blacklist.length > 0) {
    const html = stats.blacklist.map(b => {
      const minLeft = Math.floor(b.remaining_sec / 60);
      const secLeft = b.remaining_sec % 60;
      return `<span style="color:#f85149;margin-right:12px;font-size:13px">⛔ ${b.coin} (${b.since} 剩余 ${minLeft}:${secLeft.toString().padStart(2,'0')})</span>`;
    }).join('');
    $('bl-body').innerHTML = html;
  } else {
    $('bl-body').innerHTML = '<span class="text-dim">暂无</span>';
  }
};

// P3-4: Real-time trade events
eventHandlers.trade_open = (trade) => {
  // Flash the positions card to draw attention
  const card = $('positions-card');
  card.style.transition = 'border-color 0.3s';
  card.style.borderColor = '#3fb950';
  setTimeout(() => { card.style.borderColor = ''; }, 2000);
  // Refresh trades table
  setTimeout(loadTrades, 500);
};

eventHandlers.trade_close = (trade) => {
  const card = $('trades-card');
  card.style.transition = 'border-color 0.3s';
  card.style.borderColor = trade.pnl_pct > 0 ? '#3fb950' : '#f85149';
  setTimeout(() => { card.style.borderColor = ''; }, 2000);
  setTimeout(loadTrades, 500);
};

// ---- Trades from API ----
async function loadTrades() {
  try {
    const resp = await fetch('/api/trades');
    const data = await resp.json();
    const trades = data.trades || [];

    if (trades.length === 0) {
      els.tradesBody.innerHTML = '<tr><td colspan="8" class="text-dim">暂无交易记录</td></tr>';
      return;
    }

    const html = trades.slice(0, 20).map(t => {
      const pnlCls = t.NetPnl > 0 ? 'text-green' : t.NetPnl < 0 ? 'text-red' : '';
      const convCls = t.Convergence === '价差收敛' ? 'text-green' :
                      t.Convergence === '价差发散' ? 'text-red' : 'text-yellow';
      return `<tr class="trade-row" data-id="${t.ID}" onclick="openTradeDetail(${t.ID})">
        <td class="text-dim">${t.ClosedAt ? new Date(t.ClosedAt).toLocaleTimeString('zh-CN', { hour12: false }) : '-'}</td>
        <td><strong>${t.Coin}</strong></td>
        <td>${t.Direction}</td>
        <td class="text-right">${t.EntrySpread != null ? t.EntrySpread.toFixed(4) : '-'}</td>
        <td class="text-right">${t.ExitSpread != null ? t.ExitSpread.toFixed(4) : '-'}</td>
        <td class="text-right ${pnlCls}"><strong>${t.NetPnl != null ? t.NetPnl.toFixed(4) : '-'}</strong></td>
        <td class="${convCls}">${t.Convergence || '-'}</td>
        <td>${t.ExitReason || '-'}</td>
      </tr>`;
    }).join('');

    els.tradesBody.innerHTML = html;
  } catch (err) {
    els.tradesBody.innerHTML = '<tr><td colspan="8" class="text-red">加载失败</td></tr>';
  }
}

// ---- Trade Detail Modal ----
function openTradeDetail(id) {
  const modal = document.getElementById('trade-modal');
  const body = document.getElementById('trade-detail-body');
  modal.style.display = 'flex';
  body.innerHTML = '<div class="loading">加载中...</div>';

  fetch('/api/trade/' + id)
    .then(r => r.json())
    .then(data => {
      const t = data.trade;
      if (!t || !t.ID) {
        body.innerHTML = '<div class="loading text-red">交易数据加载失败</div>';
        return;
      }

      const opened = new Date(t.OpenedAt);
      const closed = t.ClosedAt ? new Date(t.ClosedAt) : null;
      const dur = closed ? Math.round((closed - opened) / 1000) + 's' : '-';
      const pnlCls = t.NetPnl > 0 ? 'text-green' : t.NetPnl < 0 ? 'text-red' : '';

      const feeEntry = t.FeeEntry != null ? t.FeeEntry.toFixed(3) + '%' : '-';
      const feeExit = t.FeeExit != null ? t.FeeExit.toFixed(3) + '%' : '-';
      const totalFee = t.FeeEntry != null && t.FeeExit != null
        ? (t.FeeEntry + t.FeeExit).toFixed(3) + '%' : '-';

      const le = t.LongEntry != null ? t.LongEntry.toFixed(6) : '-';
      const lx = t.LongExit != null ? t.LongExit.toFixed(6) : '-';
      const se = t.ShortEntry != null ? t.ShortEntry.toFixed(6) : '-';
      const sx = t.ShortExit != null ? t.ShortExit.toFixed(6) : '-';
      const lpnl = t.LongPnl != null ? t.LongPnl.toFixed(4) + '%' : '-';
      const spnl = t.ShortPnl != null ? t.ShortPnl.toFixed(4) + '%' : '-';

      body.innerHTML = `<div class="detail-grid">
        <div class="detail-section">
          <h3>概览</h3>
          <div class="detail-row"><span class="label">币种</span><span class="value"><strong>${t.Coin}</strong>/USDT</span></div>
          <div class="detail-row"><span class="label">方向</span><span class="value">${t.Direction || '-'}</span></div>
          <div class="detail-row"><span class="label">状态</span><span class="value">${t.Status === 'closed' ? '已平仓' : t.Status}</span></div>
          <div class="detail-row"><span class="label">加仓次数</span><span class="value">${t.ScaleCount || 0} 次</span></div>
          <div class="detail-row"><span class="label">总规模</span><span class="value">$${(t.AmountUSD || 0).toFixed(0)}</span></div>
        </div>
        <div class="detail-section">
          <h3>时间</h3>
          <div class="detail-row"><span class="label">开仓</span><span class="value">${opened.toLocaleString('zh-CN', { hour12: false })}</span></div>
          <div class="detail-row"><span class="label">平仓</span><span class="value">${closed ? closed.toLocaleString('zh-CN', { hour12: false }) : '-'}</span></div>
          <div class="detail-row"><span class="label">持仓时长</span><span class="value">${dur}</span></div>
        </div>
        <div class="detail-section">
          <h3>价差</h3>
          <div class="detail-row"><span class="label">入场价差</span><span class="value">${t.EntrySpread != null ? t.EntrySpread.toFixed(4) + '%' : '-'}</span></div>
          <div class="detail-row"><span class="label">出场价差</span><span class="value">${t.ExitSpread != null ? t.ExitSpread.toFixed(4) + '%' : '-'}</span></div>
          <div class="detail-row"><span class="label">收敛情况</span><span class="value ${t.Convergence === '价差收敛' ? 'text-green' : t.Convergence === '价差发散' ? 'text-red' : ''}">${t.Convergence || '-'}</span></div>
          <div class="detail-row"><span class="label">平仓原因</span><span class="value">${t.ExitReason || '-'}</span></div>
        </div>
        <div class="detail-section">
          <h3>手续费</h3>
          <div class="detail-row"><span class="label">开仓费</span><span class="value">${feeEntry}</span></div>
          <div class="detail-row"><span class="label">平仓费</span><span class="value">${feeExit}</span></div>
          <div class="detail-row"><span class="label">总手续费</span><span class="value">${totalFee}</span></div>
        </div>
        <div class="detail-section">
          <h3>多仓 ${t.LongExchange || '-'}</h3>
          <div class="detail-row"><span class="label">入场价</span><span class="value">$${le}</span></div>
          <div class="detail-row"><span class="label">出场价</span><span class="value">$${lx}</span></div>
          <div class="detail-row"><span class="label">盈亏</span><span class="value ${t.LongPnl > 0 ? 'text-green' : t.LongPnl < 0 ? 'text-red' : ''}">${lpnl}</span></div>
        </div>
        <div class="detail-section">
          <h3>空仓 ${t.ShortExchange || '-'}</h3>
          <div class="detail-row"><span class="label">入场价</span><span class="value">$${se}</span></div>
          <div class="detail-row"><span class="label">出场价</span><span class="value">$${sx}</span></div>
          <div class="detail-row"><span class="label">盈亏</span><span class="value ${t.ShortPnl > 0 ? 'text-green' : t.ShortPnl < 0 ? 'text-red' : ''}">${spnl}</span></div>
        </div>
        <div class="detail-section detail-section-full">
          <h3>净收益</h3>
          <div class="detail-row" style="font-size:16px"><span class="label">总计</span><span class="value ${pnlCls}" style="font-weight:700">${t.NetPnl != null ? t.NetPnl.toFixed(4) + '%' : '-'}</span></div>
        </div>
      </div>`;

      // Append orders table if available
      if (data.orders && data.orders.length > 0) {
        const ordersHtml = data.orders.map(o => {
          const typeLabel = o.Type === 'entry' ? '开仓' : o.Type === 'exit' ? '平仓' : o.Type === 'scale' ? '加仓' : o.Type;
          return `<tr><td>${typeLabel}</td><td>${o.Side === 'buy' ? '买' : '卖'}</td><td>${o.Exchange}</td><td>$${o.Price ? o.Price.toFixed(6) : '-'}</td><td>${o.Size || '-'}</td><td>${o.Fee ? o.Fee.toFixed(4) + '%' : '-'}</td><td>${o.OrderID ? o.OrderID.substring(0, 12) + '...' : '-'}</td></tr>`;
        }).join('');
        body.innerHTML += `<div class="detail-section detail-section-full" style="border-top:1px solid var(--border)">
          <h3>订单明细 (${data.orders.length})</h3>
          <table class="detail-orders">
            <thead><tr><th>类型</th><th>方向</th><th>交易所</th><th>价格</th><th>数量</th><th>手续费</th><th>订单ID</th></tr></thead>
            <tbody>${ordersHtml}</tbody>
          </table>
        </div>`;
      }
    })
    .catch(err => {
      body.innerHTML = '<div class="loading text-red">加载失败: ' + err.message + '</div>';
    });
}

function closeTradeDetail() {
  document.getElementById('trade-modal').style.display = 'none';
}

// Close modal on overlay click
document.addEventListener('click', function(e) {
  const modal = document.getElementById('trade-modal');
  if (e.target === modal) closeTradeDetail();
});

// Close on Escape
document.addEventListener('keydown', function(e) {
  if (e.key === 'Escape') closeTradeDetail();
});

// Expose modal functions to global scope for HTML onclick handlers
window.openTradeDetail = openTradeDetail;
window.closeTradeDetail = closeTradeDetail;

// ---- Init ----
function init() {
  connectSSE();
  loadTrades();
  setInterval(loadTrades, 10000);
}

if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', init);
} else {
  init();
}

})();