'use client';
import { useState, useEffect } from 'react';

const GREEN = '#28CC95';
const RED = '#FF6B6B';

export default function Dashboard() {
  const [data, setData] = useState(null);
  const [trades, setTrades] = useState([]);
  const [loading, setLoading] = useState(true);
  const [tab, setTab] = useState('market');

  useEffect(() => {
    const fetchState = async () => {
      try {
        const res = await fetch('/api/state');
        const json = await res.json();
        setData(json);
        setLoading(false);
      } catch (e) {
        console.error('State fetch error:', e);
      }
    };

    const fetchTrades = async () => {
      try {
        const res = await fetch('/api/trades');
        const json = await res.json();
        setTrades(json.trades || []);
      } catch (e) {
        console.error('Trades fetch error:', e);
      }
    };

    fetchState();
    fetchTrades();
    const interval = setInterval(fetchState, 2000);
    const tradesInterval = setInterval(fetchTrades, 10000);

    return () => {
      clearInterval(interval);
      clearInterval(tradesInterval);
    };
  }, []);

  if (loading) {
    return (
      <div className="min-h-screen bg-[#0a0a0a] flex items-center justify-center">
        <div className="text-[#28CC95] text-lg animate-pulse">Loading Kalbot...</div>
      </div>
    );
  }

  const market = data?.market;
  const paper = data?.paper;
  const strategies = data?.strategies || [];

  return (
    <div className="min-h-screen bg-[#0a0a0a] text-white font-sans pb-20">
      {/* Header */}
      <header className="sticky top-0 z-50 bg-[#0a0a0a]/95 backdrop-blur border-b border-white/10 px-4 py-3">
        <div className="flex items-center justify-between max-w-lg mx-auto">
          <h1 className="text-lg font-bold" style={{ color: GREEN }}>Kalbot</h1>
          <div className="flex items-center gap-2">
            <span className={`w-2 h-2 rounded-full ${data?.lastUpdate ? 'bg-green-400 animate-pulse' : 'bg-red-500'}`} />
            <span className="text-xs text-gray-400">
              {data?.lastUpdate ? 'Live' : 'Offline'}
            </span>
          </div>
        </div>
      </header>

      <main className="max-w-lg mx-auto px-4 pt-4 space-y-4">
        {/* Market Card */}
        <MarketCard market={market} />

        {/* Paper Stats */}
        <PaperStats paper={paper} />

        {/* Tab Bar */}
        <div className="flex gap-1 bg-white/5 rounded-lg p-1">
          {['market', 'strategies', 'trades'].map(t => (
            <button
              key={t}
              onClick={() => setTab(t)}
              className={`flex-1 py-2 px-3 rounded-md text-sm font-medium transition-all ${
                tab === t ? 'bg-white/10 text-white' : 'text-gray-500 hover:text-gray-300'
              }`}
            >
              {t.charAt(0).toUpperCase() + t.slice(1)}
            </button>
          ))}
        </div>

        {/* Tab Content */}
        {tab === 'market' && <MarketDetails market={market} />}
        {tab === 'strategies' && <StrategiesView strategies={strategies} />}
        {tab === 'trades' && <TradesView trades={trades} openPositions={paper?.openPositions || []} />}
      </main>

      {/* Worker Uptime */}
      <div className="fixed bottom-0 left-0 right-0 bg-[#0a0a0a]/95 backdrop-blur border-t border-white/5 py-2 px-4">
        <div className="max-w-lg mx-auto flex justify-between text-xs text-gray-600">
          <span>Worker uptime: {formatUptime(data?.workerUptime)}</span>
          <span>Updated: {data?.lastUpdate ? new Date(data.lastUpdate).toLocaleTimeString() : 'never'}</span>
        </div>
      </div>
    </div>
  );
}

function MarketCard({ market }) {
  if (!market) {
    return (
      <div className="bg-white/5 rounded-2xl p-5 border border-white/10">
        <p className="text-gray-500 text-center">No active market — waiting for next 15-min window...</p>
      </div>
    );
  }

  const timeLeft = market.closeTime ? getTimeLeft(market.closeTime) : null;

  return (
    <div className="bg-white/5 rounded-2xl p-5 border border-white/10 space-y-4">
      {/* Title */}
      <div className="flex items-center justify-between">
        <div>
          <h2 className="font-bold text-base">BTC Up or Down</h2>
          <p className="text-xs text-gray-400">15 minutes</p>
        </div>
        <div className="flex items-center gap-2">
          {timeLeft && (
            <span className="text-xs bg-white/10 px-2 py-1 rounded-full text-gray-300">
              ⏱ {timeLeft}
            </span>
          )}
          <span className="text-2xl">₿</span>
        </div>
      </div>

      {/* Up */}
      <div className="space-y-2">
        <div className="flex items-center justify-between">
          <span className="text-sm font-medium">Up</span>
          <div className="flex items-center gap-3">
            <span className="text-sm text-gray-400">{market.yesOdds}x</span>
            <span className="text-sm font-bold px-3 py-1 rounded-full border"
              style={{ borderColor: GREEN, color: GREEN }}>
              {market.yesPct}%
            </span>
          </div>
        </div>
        <div className="w-full bg-white/10 rounded-full h-2">
          <div className="h-2 rounded-full transition-all duration-500"
            style={{ width: `${market.yesPct}%`, backgroundColor: GREEN }} />
        </div>
      </div>

      {/* Down */}
      <div className="space-y-2">
        <div className="flex items-center justify-between">
          <span className="text-sm font-medium">Down</span>
          <div className="flex items-center gap-3">
            <span className="text-sm text-gray-400">{market.noOdds}x</span>
            <span className="text-sm font-bold px-3 py-1 rounded-full border"
              style={{ borderColor: '#4A90D9', color: '#4A90D9' }}>
              {market.noPct}%
            </span>
          </div>
        </div>
        <div className="w-full bg-white/10 rounded-full h-2">
          <div className="h-2 rounded-full transition-all duration-500"
            style={{ width: `${market.noPct}%`, backgroundColor: '#4A90D9' }} />
        </div>
      </div>

      {/* Volume */}
      <div className="flex justify-between text-xs text-gray-500 pt-1">
        <span>${(market.volume || 0).toLocaleString()} vol</span>
        <span className="font-mono text-gray-600">{market.ticker}</span>
      </div>
    </div>
  );
}

function PaperStats({ paper }) {
  if (!paper) return null;

  const pnlColor = paper.totalPnL >= 0 ? GREEN : RED;

  return (
    <div className="grid grid-cols-4 gap-2">
      <StatBox label="Balance" value={`$${paper.balance}`} />
      <StatBox label="PnL" value={`${paper.totalPnL >= 0 ? '+' : ''}$${paper.totalPnL}`} color={pnlColor} />
      <StatBox label="Win Rate" value={`${paper.winRate}%`} color={paper.winRate >= 50 ? GREEN : RED} />
      <StatBox label="Trades" value={paper.totalTrades} />
    </div>
  );
}

function StatBox({ label, value, color }) {
  return (
    <div className="bg-white/5 rounded-xl p-3 border border-white/5 text-center">
      <p className="text-[10px] text-gray-500 uppercase tracking-wider">{label}</p>
      <p className="text-sm font-bold mt-0.5" style={color ? { color } : {}}>{value}</p>
    </div>
  );
}

function MarketDetails({ market }) {
  if (!market) return <p className="text-gray-500 text-sm text-center py-8">No market data</p>;

  const rows = [
    ['Yes Bid / Ask', `${market.yesBid || '-'}¢ / ${market.yesAsk || '-'}¢`],
    ['No Bid / Ask', `${market.noBid || '-'}¢ / ${market.noAsk || '-'}¢`],
    ['Last Price', `${market.lastPrice || '-'}¢`],
    ['Volume 24h', `$${(market.volume24h || 0).toLocaleString()}`],
    ['Open Interest', (market.openInterest || 0).toLocaleString()],
    ['Status', market.status || 'unknown'],
    ['Closes', market.closeTime ? new Date(market.closeTime).toLocaleTimeString() : '-'],
  ];

  return (
    <div className="bg-white/5 rounded-xl border border-white/5 overflow-hidden">
      {rows.map(([k, v], i) => (
        <div key={k} className={`flex justify-between px-4 py-3 ${i < rows.length - 1 ? 'border-b border-white/5' : ''}`}>
          <span className="text-sm text-gray-400">{k}</span>
          <span className="text-sm font-medium">{v}</span>
        </div>
      ))}
    </div>
  );
}

function StrategiesView({ strategies }) {
  if (!strategies.length) {
    return <p className="text-gray-500 text-sm text-center py-8">No strategies loaded</p>;
  }

  return (
    <div className="space-y-3">
      {strategies.map((s, i) => (
        <div key={i} className="bg-white/5 rounded-xl p-4 border border-white/5">
          <div className="flex items-center justify-between mb-2">
            <div className="flex items-center gap-2">
              <span className={`w-2 h-2 rounded-full ${s.enabled && !s.paused ? 'bg-green-400' : 'bg-red-500'}`} />
              <span className="font-bold text-sm capitalize">{s.name}</span>
            </div>
            <span className="text-xs px-2 py-0.5 rounded-full bg-white/10 text-gray-400">{s.mode}</span>
          </div>

          <div className="space-y-1 text-xs text-gray-400">
            {s.config && Object.entries(s.config).map(([k, v]) => (
              <div key={k} className="flex justify-between">
                <span>{k}</span>
                <span className="text-gray-300">{typeof v === 'number' ? v : String(v)}</span>
              </div>
            ))}
            {s.consecutiveLosses !== undefined && (
              <div className="flex justify-between mt-1 pt-1 border-t border-white/5">
                <span>Consecutive Losses</span>
                <span className={s.consecutiveLosses > 0 ? 'text-red-400' : 'text-gray-300'}>
                  {s.consecutiveLosses}
                </span>
              </div>
            )}
            {s.currentBetSize !== undefined && (
              <div className="flex justify-between">
                <span>Next Bet</span>
                <span className="text-gray-300">${s.currentBetSize}</span>
              </div>
            )}
            {s.paused && (
              <div className="text-red-400 font-medium mt-1">⚠️ PAUSED — max losses reached</div>
            )}
          </div>
        </div>
      ))}
    </div>
  );
}

function TradesView({ trades, openPositions }) {
  return (
    <div className="space-y-3">
      {/* Open Positions */}
      {openPositions.length > 0 && (
        <div>
          <h3 className="text-xs text-gray-500 uppercase tracking-wider mb-2">Open Positions</h3>
          {openPositions.map((t, i) => (
            <TradeRow key={i} trade={t} isOpen />
          ))}
        </div>
      )}

      {/* Trade History */}
      <div>
        <h3 className="text-xs text-gray-500 uppercase tracking-wider mb-2">
          History ({trades.length})
        </h3>
        {trades.length === 0 ? (
          <p className="text-gray-600 text-sm text-center py-6">No trades yet. Strategies are watching...</p>
        ) : (
          trades.map((t, i) => <TradeRow key={i} trade={t} />)
        )}
      </div>
    </div>
  );
}

function TradeRow({ trade, isOpen }) {
  const won = trade.pnl > 0;
  const pnlColor = trade.pnl == null ? 'text-gray-400' : won ? 'text-green-400' : 'text-red-400';

  return (
    <div className="bg-white/5 rounded-lg p-3 border border-white/5 mb-2">
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-2">
          {isOpen ? (
            <span className="w-2 h-2 rounded-full bg-yellow-400 animate-pulse" />
          ) : (
            <span>{won ? '✅' : '❌'}</span>
          )}
          <span className="text-sm font-medium capitalize">{trade.side}</span>
          <span className="text-xs text-gray-500">@ {trade.price}¢</span>
        </div>
        <span className={`text-sm font-bold ${pnlColor}`}>
          {trade.pnl != null ? `${trade.pnl >= 0 ? '+' : ''}$${trade.pnl}` : 'open'}
        </span>
      </div>
      <div className="flex justify-between mt-1">
        <span className="text-[10px] text-gray-600 capitalize">{trade.strategy}</span>
        <span className="text-[10px] text-gray-600">
          {trade.entryTime ? new Date(trade.entryTime).toLocaleTimeString() : ''}
        </span>
      </div>
      {trade.reason && (
        <p className="text-[10px] text-gray-600 mt-1 truncate">{trade.reason}</p>
      )}
    </div>
  );
}

function getTimeLeft(closeTime) {
  const diff = new Date(closeTime).getTime() - Date.now();
  if (diff <= 0) return 'Closing...';
  const mins = Math.floor(diff / 60000);
  const secs = Math.floor((diff % 60000) / 1000);
  return `${mins}:${secs.toString().padStart(2, '0')}`;
}

function formatUptime(seconds) {
  if (!seconds) return '0s';
  const h = Math.floor(seconds / 3600);
  const m = Math.floor((seconds % 3600) / 60);
  const s = Math.floor(seconds % 60);
  if (h > 0) return `${h}h ${m}m`;
  if (m > 0) return `${m}m ${s}s`;
  return `${s}s`;
}