/**
 * Get Active Positions API Endpoint
 * 
 * Returns all currently monitored positions
 * GET /api/trading/positions
 */

import { NextRequest, NextResponse } from 'next/server'
import { getPositionManager } from '@/v4/lib/trading/position-manager'

export interface PositionsResponse {
  success: boolean
  monitoring: {
    isActive: boolean
    tradeCount: number
    symbols: string[]
  }
  positions: Array<{
    id: string
    symbol: string
    direction: 'long' | 'short'
    entryPrice: number
    currentPrice: number
    entryTime: string
    positionSize: number
    currentSize: number
    leverage: number
    stopLoss: number
    takeProfit1: number
    takeProfit2: number
    tp1Hit: boolean
    slMovedToBreakeven: boolean
    realizedPnL: number
    unrealizedPnL: number
    peakPnL: number
    profitPercent: number
    accountPnL: number
    priceChecks: number
    ageMinutes: number
  }>
}

export async function GET(request: NextRequest): Promise<NextResponse<PositionsResponse>> {
  try {
    // Verify authorization
    const authHeader = request.headers.get('authorization')
    const expectedAuth = `Bearer ${process.env.API_SECRET_KEY}`
    
    if (!authHeader || authHeader !== expectedAuth) {
      return NextResponse.json(
        {
          success: false,
          monitoring: { isActive: false, tradeCount: 0, symbols: [] },
          positions: [],
        } as any,
        { status: 401 }
      )
    }

    const positionManager = getPositionManager()
    const status = positionManager.getStatus()
    const trades = positionManager.getActiveTrades()

    const positions = trades.map(trade => {
      const profitPercent = calculateProfitPercent(
        trade.entryPrice,
        trade.lastPrice,
        trade.direction
      )
      
      const accountPnL = profitPercent * trade.leverage
      const ageMinutes = Math.floor((Date.now() - trade.entryTime) / 60000)

      return {
        id: trade.id,
        symbol: trade.symbol,
        direction: trade.direction,
        entryPrice: trade.entryPrice,
        currentPrice: trade.lastPrice,
        entryTime: new Date(trade.entryTime).toISOString(),
        positionSize: trade.positionSize,
        currentSize: trade.currentSize,
        leverage: trade.leverage,
        stopLoss: trade.stopLossPrice,
        takeProfit1: trade.tp1Price,
        takeProfit2: trade.tp2Price,
        tp1Hit: trade.tp1Hit,
        slMovedToBreakeven: trade.slMovedToBreakeven,
        realizedPnL: trade.realizedPnL,
        unrealizedPnL: trade.unrealizedPnL,
        peakPnL: trade.peakPnL,
        profitPercent: profitPercent,
        accountPnL: accountPnL,
        priceChecks: trade.priceCheckCount,
        ageMinutes,
      }
    })

    return NextResponse.json({
      success: true,
      monitoring: {
        isActive: status.isMonitoring,
        tradeCount: status.activeTradesCount,
        symbols: status.symbols,
      },
      positions,
    })

  } catch (error) {
    console.error('❌ Error fetching positions:', error)
    
    return NextResponse.json(
      {
        success: false,
        monitoring: { isActive: false, tradeCount: 0, symbols: [] },
        positions: [],
      } as any,
      { status: 500 }
    )
  }
}

function calculateProfitPercent(
  entryPrice: number,
  currentPrice: number,
  direction: 'long' | 'short'
): number {
  if (direction === 'long') {
    return ((currentPrice - entryPrice) / entryPrice) * 100
  } else {
    return ((entryPrice - currentPrice) / entryPrice) * 100
  }
}