/**
 * Trading Bot v4 - Analytics Dashboard
 * 
 * Comprehensive view of trading performance and statistics
 */

'use client'

import { useState, useEffect } from 'react'

interface Stats {
  period: string
  realTrades: {
    total: number
    winning: number
    losing: number
    winRate: string
    totalPnL: string
    avgWin: string
    avgLoss: string
    profitFactor: string
  }
  testTrades: {
    count: number
    note: string
  }
}

interface LastTrade {
  id: string
  symbol: string
  direction: string
  entryPrice: number
  entryTime: string
  exitPrice?: number
  exitTime?: string
  exitReason?: string
  realizedPnL?: number
  realizedPnLPercent?: number
  positionSizeUSD: number
  leverage: number
  stopLossPrice: number
  takeProfit1Price: number
  takeProfit2Price: number
  isTestTrade: boolean
  signalQualityScore?: number
}

interface NetPosition {
  symbol: string
  longUSD: number
  shortUSD: number
  netUSD: number
  netSOL: number
  netDirection: 'long' | 'short' | 'flat'
  tradeCount: number
}

interface PositionSummary {
  summary: {
    individualTrades: number
    testTrades: number
    totalIndividualExposure: string
    netExposure: string
    explanation: string
  }
  netPositions: NetPosition[]
}

export default function AnalyticsPage() {
  const [stats, setStats] = useState<Stats | null>(null)
  const [positions, setPositions] = useState<PositionSummary | null>(null)
  const [lastTrade, setLastTrade] = useState<LastTrade | null>(null)
  const [loading, setLoading] = useState(true)
  const [selectedDays, setSelectedDays] = useState(30)

  useEffect(() => {
    loadData()
  }, [selectedDays])

  const loadData = async () => {
    setLoading(true)
    try {
      const [statsRes, positionsRes, lastTradeRes] = await Promise.all([
        fetch(`/api/analytics/stats?days=${selectedDays}`),
        fetch('/api/analytics/positions'),
        fetch('/api/analytics/last-trade'),
      ])

      const statsData = await statsRes.json()
      const positionsData = await positionsRes.json()
      const lastTradeData = await lastTradeRes.json()

      setStats(statsData.stats)
      setPositions(positionsData.summary)
      setLastTrade(lastTradeData.trade)
    } catch (error) {
      console.error('Failed to load analytics:', error)
    }
    setLoading(false)
  }

  const clearManuallyClosed = async () => {
    if (!confirm('Clear all open trades from database? Use this if you manually closed positions in Drift UI.')) {
      return
    }

    try {
      const res = await fetch('/api/trading/clear-manual-closes', {
        method: 'POST',
      })

      if (res.ok) {
        alert('✅ Manually closed trades cleared from database')
        loadData() // Reload data
      } else {
        const error = await res.json()
        alert(`❌ Failed to clear: ${error.error}`)
      }
    } catch (error) {
      console.error('Failed to clear trades:', error)
      alert('❌ Failed to clear trades')
    }
  }

  if (loading) {
    return (
      <div className="min-h-screen bg-gradient-to-br from-gray-900 via-gray-800 to-gray-900 flex items-center justify-center">
        <div className="text-center">
          <div className="inline-block animate-spin rounded-full h-12 w-12 border-t-2 border-b-2 border-blue-500 mb-4"></div>
          <p className="text-gray-400">Loading analytics...</p>
        </div>
      </div>
    )
  }

  return (
    <div className="min-h-screen bg-gradient-to-br from-gray-900 via-gray-800 to-gray-900">
      {/* Header */}
      <div className="bg-gray-800/50 backdrop-blur-sm border-b border-gray-700">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-6">
          <div className="flex items-center justify-between">
            <div className="flex items-center space-x-4">
              <a href="/" className="text-gray-400 hover:text-white transition">
                <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10 19l-7-7m0 0l7-7m-7 7h18" />
                </svg>
              </a>
              <div>
                <h1 className="text-2xl font-bold text-white">📊 Analytics Dashboard</h1>
                <p className="text-sm text-gray-400">Trading performance and statistics</p>
              </div>
            </div>
            
            {/* Time Period Selector */}
            <div className="flex items-center space-x-4">
              <a
                href="/analytics/optimization"
                className="px-4 py-2 bg-blue-600 hover:bg-blue-700 rounded-lg text-white font-semibold transition-colors"
              >
                🎯 TP/SL Optimization
              </a>
              
              <div className="flex items-center space-x-2">
                <span className="text-sm text-gray-400">Period:</span>
                <select
                  value={selectedDays}
                  onChange={(e) => setSelectedDays(Number(e.target.value))}
                  className="bg-gray-700 text-white rounded-lg px-4 py-2 border border-gray-600 focus:border-blue-500 focus:outline-none"
                >
                  <option value={7}>7 days</option>
                  <option value={30}>30 days</option>
                  <option value={90}>90 days</option>
                  <option value={365}>1 year</option>
                </select>
              </div>
            </div>
          </div>
        </div>
      </div>

      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
        {/* Position Summary */}
        {positions && (
          <div className="mb-8">
            <div className="flex items-center justify-between mb-4">
              <h2 className="text-xl font-bold text-white">📍 Current Positions</h2>
              <button
                onClick={clearManuallyClosed}
                className="px-4 py-2 bg-red-600 hover:bg-red-700 rounded-lg text-white text-sm font-semibold transition-colors"
                title="Clear open trades from database if you manually closed them in Drift UI"
              >
                🗑️ Clear Manual Closes
              </button>
            </div>
            <div className="grid md:grid-cols-4 gap-4">
              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <div className="text-sm text-gray-400 mb-1">Open Trades</div>
                <div className="text-3xl font-bold text-white">{positions.summary.individualTrades}</div>
              </div>
              
              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <div className="text-sm text-gray-400 mb-1">Test Trades</div>
                <div className="text-3xl font-bold text-yellow-500">{positions.summary.testTrades}</div>
              </div>
              
              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <div className="text-sm text-gray-400 mb-1">Total Exposure</div>
                <div className="text-3xl font-bold text-blue-400">{positions.summary.totalIndividualExposure}</div>
              </div>
              
              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <div className="text-sm text-gray-400 mb-1">Net Exposure</div>
                <div className="text-3xl font-bold text-purple-400">{positions.summary.netExposure}</div>
              </div>
            </div>

            {positions.netPositions.length > 0 && (
              <div className="mt-4 bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <h3 className="text-lg font-semibold text-white mb-4">Net Positions (Drift View)</h3>
                <div className="space-y-3">
                  {positions.netPositions.map((pos, i) => (
                    <div key={i} className="flex items-center justify-between p-4 bg-gray-700/30 rounded-lg">
                      <div className="flex items-center space-x-4">
                        <div className="text-2xl">🎯</div>
                        <div>
                          <div className="text-white font-medium">{pos.symbol}</div>
                          <div className="text-sm text-gray-400">{pos.tradeCount} trade{pos.tradeCount > 1 ? 's' : ''}</div>
                        </div>
                      </div>
                      
                      <div className="text-right">
                        <div className={`text-lg font-bold ${pos.netDirection === 'long' ? 'text-green-400' : pos.netDirection === 'short' ? 'text-red-400' : 'text-gray-400'}`}>
                          {pos.netDirection.toUpperCase()}: {Math.abs(pos.netSOL).toFixed(4)} SOL
                        </div>
                        <div className="text-sm text-gray-400">${Math.abs(pos.netUSD).toFixed(2)}</div>
                      </div>
                    </div>
                  ))}
                </div>
              </div>
            )}

            {positions.summary.individualTrades === 0 && (
              <div className="mt-4 bg-gray-800/30 backdrop-blur-sm rounded-xl p-8 border border-gray-700 text-center">
                <div className="text-4xl mb-2">📭</div>
                <p className="text-gray-400">No open positions</p>
              </div>
            )}
          </div>
        )}

        {/* Last Trade Details */}
        {lastTrade && (
          <div className="mb-8">
            <h2 className="text-xl font-bold text-white mb-4">🔍 Last Trade</h2>
            <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
              <div className="flex items-start justify-between mb-4">
                <div className="flex items-center space-x-4">
                  <div className="text-3xl">
                    {lastTrade.direction === 'long' ? '📈' : '📉'}
                  </div>
                  <div>
                    <div className="text-2xl font-bold text-white">{lastTrade.symbol}</div>
                    <div className="flex items-center space-x-2 mt-1">
                      <span className={`px-3 py-1 rounded-full text-sm font-semibold ${lastTrade.direction === 'long' ? 'bg-green-900/50 text-green-400' : 'bg-red-900/50 text-red-400'}`}>
                        {lastTrade.direction.toUpperCase()}
                      </span>
                      {lastTrade.isTestTrade && (
                        <span className="px-3 py-1 rounded-full text-sm font-semibold bg-yellow-900/50 text-yellow-400">
                          TEST
                        </span>
                      )}
                    </div>
                  </div>
                </div>
                
                {lastTrade.exitTime && lastTrade.realizedPnL !== undefined && (
                  <div className="text-right">
                    <div className={`text-3xl font-bold ${lastTrade.realizedPnL >= 0 ? 'text-green-400' : 'text-red-400'}`}>
                      {lastTrade.realizedPnL >= 0 ? '+' : ''}${lastTrade.realizedPnL.toFixed(2)}
                    </div>
                    {lastTrade.realizedPnLPercent !== undefined && (
                      <div className={`text-sm ${lastTrade.realizedPnLPercent >= 0 ? 'text-green-400' : 'text-red-400'}`}>
                        {lastTrade.realizedPnLPercent >= 0 ? '+' : ''}{lastTrade.realizedPnLPercent.toFixed(2)}%
                      </div>
                    )}
                  </div>
                )}
                
                {!lastTrade.exitTime && (
                  <div className="text-right">
                    <div className="text-2xl font-bold text-blue-400">OPEN</div>
                    <div className="text-sm text-gray-400">Currently active</div>
                  </div>
                )}
              </div>
              
              <div className="grid md:grid-cols-3 gap-4 mb-4">
                <div className="bg-gray-700/30 rounded-lg p-4">
                  <div className="text-sm text-gray-400 mb-1">Entry</div>
                  <div className="text-xl font-bold text-white">${lastTrade.entryPrice.toFixed(4)}</div>
                  <div className="text-xs text-gray-500">
                    {new Date(lastTrade.entryTime).toLocaleString()}
                  </div>
                </div>
                
                <div className="bg-gray-700/30 rounded-lg p-4">
                  <div className="text-sm text-gray-400 mb-1">Position Size</div>
                  <div className="text-xl font-bold text-white">${lastTrade.positionSizeUSD.toFixed(2)}</div>
                  <div className="text-xs text-gray-500">
                    {lastTrade.leverage}x leverage
                  </div>
                </div>
                
                <div className="bg-gray-700/30 rounded-lg p-4">
                  <div className="text-sm text-gray-400 mb-1">Signal Quality</div>
                  {lastTrade.signalQualityScore !== undefined ? (
                    <>
                      <div className={`text-xl font-bold ${lastTrade.signalQualityScore >= 80 ? 'text-green-400' : lastTrade.signalQualityScore >= 70 ? 'text-yellow-400' : 'text-orange-400'}`}>
                        {lastTrade.signalQualityScore}/100
                      </div>
                      <div className="text-xs text-gray-500">
                        {lastTrade.signalQualityScore >= 80 ? 'Excellent' : lastTrade.signalQualityScore >= 70 ? 'Good' : 'Marginal'}
                      </div>
                    </>
                  ) : (
                    <>
                      <div className="text-xl font-bold text-gray-500">N/A</div>
                      <div className="text-xs text-gray-500">No score available</div>
                    </>
                  )}
                </div>
              </div>
              
              {lastTrade.exitTime && lastTrade.exitPrice && (
                <div className="grid md:grid-cols-1 gap-4 mb-4">
                  <div className="bg-gray-700/30 rounded-lg p-4">
                    <div className="text-sm text-gray-400 mb-1">Exit</div>
                    <div className="text-xl font-bold text-white">${lastTrade.exitPrice.toFixed(4)}</div>
                    <div className="text-xs text-gray-500">
                      {new Date(lastTrade.exitTime).toLocaleString()}
                    </div>
                  </div>
                </div>
              )}
              
              <div className="grid md:grid-cols-3 gap-4">
                <div className="bg-gray-700/30 rounded-lg p-3">
                  <div className="text-xs text-gray-400 mb-1">Stop Loss</div>
                  <div className="text-lg font-semibold text-red-400">${lastTrade.stopLossPrice.toFixed(4)}</div>
                </div>
                
                <div className="bg-gray-700/30 rounded-lg p-3">
                  <div className="text-xs text-gray-400 mb-1">TP1</div>
                  <div className="text-lg font-semibold text-green-400">${lastTrade.takeProfit1Price.toFixed(4)}</div>
                </div>
                
                <div className="bg-gray-700/30 rounded-lg p-3">
                  <div className="text-xs text-gray-400 mb-1">TP2</div>
                  <div className="text-lg font-semibold text-green-400">${lastTrade.takeProfit2Price.toFixed(4)}</div>
                </div>
              </div>
              
              {lastTrade.exitReason && (
                <div className="mt-4 p-3 bg-blue-900/20 rounded-lg border border-blue-500/30">
                  <span className="text-sm text-gray-400">Exit Reason: </span>
                  <span className="text-sm font-semibold text-blue-400">{lastTrade.exitReason}</span>
                </div>
              )}
            </div>
          </div>
        )}

        {/* Trading Statistics */}
        {stats && (
          <div>
            <h2 className="text-xl font-bold text-white mb-4">📈 Performance ({stats.period})</h2>
            
            {/* Main Stats Grid */}
            <div className="grid md:grid-cols-2 lg:grid-cols-4 gap-4 mb-6">
              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <div className="text-sm text-gray-400 mb-1">Total Trades</div>
                <div className="text-3xl font-bold text-white">{stats.realTrades.total}</div>
                <div className="text-xs text-gray-500 mt-2">
                  {stats.testTrades.count} test trade{stats.testTrades.count !== 1 ? 's' : ''} excluded
                </div>
              </div>
              
              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <div className="text-sm text-gray-400 mb-1">Win Rate</div>
                <div className="text-3xl font-bold text-green-400">{stats.realTrades.winRate}</div>
                <div className="text-xs text-gray-500 mt-2">
                  {stats.realTrades.winning}W / {stats.realTrades.losing}L
                </div>
              </div>
              
              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <div className="text-sm text-gray-400 mb-1">Total P&L</div>
                <div className={`text-3xl font-bold ${parseFloat(stats.realTrades.totalPnL.replace('$', '')) >= 0 ? 'text-green-400' : 'text-red-400'}`}>
                  {stats.realTrades.totalPnL}
                </div>
              </div>
              
              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <div className="text-sm text-gray-400 mb-1">Profit Factor</div>
                <div className="text-3xl font-bold text-blue-400">{stats.realTrades.profitFactor}</div>
              </div>
            </div>

            {/* Detailed Stats */}
            <div className="grid md:grid-cols-2 gap-6">
              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <h3 className="text-lg font-semibold text-white mb-4 flex items-center">
                  <span className="text-2xl mr-2">✅</span>
                  Winning Trades
                </h3>
                <div className="space-y-3">
                  <div className="flex justify-between">
                    <span className="text-gray-400">Count:</span>
                    <span className="text-white font-medium">{stats.realTrades.winning}</span>
                  </div>
                  <div className="flex justify-between">
                    <span className="text-gray-400">Average Win:</span>
                    <span className="text-green-400 font-medium">{stats.realTrades.avgWin}</span>
                  </div>
                </div>
              </div>

              <div className="bg-gray-800/50 backdrop-blur-sm rounded-xl p-6 border border-gray-700">
                <h3 className="text-lg font-semibold text-white mb-4 flex items-center">
                  <span className="text-2xl mr-2">❌</span>
                  Losing Trades
                </h3>
                <div className="space-y-3">
                  <div className="flex justify-between">
                    <span className="text-gray-400">Count:</span>
                    <span className="text-white font-medium">{stats.realTrades.losing}</span>
                  </div>
                  <div className="flex justify-between">
                    <span className="text-gray-400">Average Loss:</span>
                    <span className="text-red-400 font-medium">{stats.realTrades.avgLoss}</span>
                  </div>
                </div>
              </div>
            </div>

            {stats.realTrades.total === 0 && (
              <div className="mt-6 bg-gray-800/30 backdrop-blur-sm rounded-xl p-8 border border-gray-700 text-center">
                <div className="text-4xl mb-2">📊</div>
                <p className="text-gray-400 mb-2">No trading data yet</p>
                <p className="text-sm text-gray-500">Start trading to see your performance statistics</p>
              </div>
            )}
          </div>
        )}

        {/* Info Note */}
        <div className="mt-8 bg-blue-900/20 backdrop-blur-sm rounded-xl p-6 border border-blue-500/30">
          <div className="flex items-start space-x-3">
            <div className="text-2xl">💡</div>
            <div>
              <h4 className="text-white font-semibold mb-2">Understanding Position Netting</h4>
              <p className="text-gray-300 text-sm leading-relaxed">
                Drift perpetual futures automatically NET opposite positions in the same market. 
                If you have both LONG and SHORT positions in SOL-PERP, Drift shows only the net exposure. 
                The database tracks individual trades for complete history, while this dashboard shows 
                your actual market exposure.
              </p>
            </div>
          </div>
        </div>
      </div>
    </div>
  )
}