/**
 * Sync Positions API Endpoint
 * 
 * Re-synchronizes Position Manager with actual Drift positions
 * Useful when:
 * - Partial fills cause tracking issues
 * - Bot restarts and loses in-memory state
 * - Manual interventions on Drift
 * - Database gets out of sync
 * 
 * POST /api/trading/sync-positions
 */

import { NextRequest, NextResponse } from 'next/server'
import { initializeDriftService, getDriftService } from '@/lib/drift/client'
import { getInitializedPositionManager } from '@/lib/trading/position-manager'
import { getPrismaClient } from '@/lib/database/trades'
import { getMergedConfig } from '@/config/trading'

export async function POST(request: NextRequest): Promise<NextResponse> {
  try {
    console.log('🔄 Position sync requested...')

    const config = getMergedConfig()
    const driftService = await initializeDriftService()
    const positionManager = await getInitializedPositionManager()
    const prisma = getPrismaClient()

    // Get all current Drift positions
    const driftPositions = await driftService.getAllPositions()
    console.log(`📊 Found ${driftPositions.length} positions on Drift`)

    // Get all currently tracked positions
    const trackedTrades = Array.from(positionManager.getActiveTrades().values())
    console.log(`📋 Position Manager tracking ${trackedTrades.length} trades`)

    const syncResults = {
      drift_positions: driftPositions.length,
      tracked_positions: trackedTrades.length,
      added: [] as string[],
      removed: [] as string[],
      unchanged: [] as string[],
      errors: [] as string[],
    }

    // Step 1: Remove tracked positions that don't exist on Drift
    for (const trade of trackedTrades) {
      const existsOnDrift = driftPositions.some(p => p.symbol === trade.symbol)
      
      if (!existsOnDrift) {
        console.log(`🗑️ Removing ${trade.symbol} (not on Drift)`)
        await positionManager.removeTrade(trade.id)
        syncResults.removed.push(trade.symbol)
        
        // Mark as closed in database
        try {
          await prisma.trade.update({
            where: { positionId: trade.positionId },
            data: {
              status: 'closed',
              exitReason: 'sync_cleanup',
              exitTime: new Date(),
            },
          })
        } catch (dbError) {
          console.error(`❌ Failed to update database for ${trade.symbol}:`, dbError)
        }
      } else {
        syncResults.unchanged.push(trade.symbol)
      }
    }

    // Step 2: Add Drift positions that aren't being tracked
    for (const driftPos of driftPositions) {
      const isTracked = trackedTrades.some(t => t.symbol === driftPos.symbol)
      
      if (!isTracked) {
        console.log(`➕ Adding ${driftPos.symbol} to Position Manager`)
        
        try {
          // Get current oracle price for this market
          const currentPrice = await driftService.getOraclePrice(driftPos.marketIndex)
          
          // Calculate targets based on current config
          const direction = driftPos.side
          const entryPrice = driftPos.entryPrice
          
          // Calculate TP/SL prices
          const calculatePrice = (entry: number, percent: number, dir: 'long' | 'short') => {
            if (dir === 'long') {
              return entry * (1 + percent / 100)
            } else {
              return entry * (1 - percent / 100)
            }
          }
          
          const stopLossPrice = calculatePrice(entryPrice, config.stopLossPercent, direction)
          const tp1Price = calculatePrice(entryPrice, config.takeProfit1Percent, direction)
          const tp2Price = calculatePrice(entryPrice, config.takeProfit2Percent, direction)
          const emergencyStopPrice = calculatePrice(entryPrice, config.emergencyStopPercent, direction)

          // Calculate position size in USD
          const positionSizeUSD = driftPos.size * currentPrice

          // Create ActiveTrade object
          const activeTrade = {
            id: `sync-${Date.now()}-${driftPos.symbol}`,
            positionId: `manual-${Date.now()}`, // Synthetic ID since we don't have the original
            symbol: driftPos.symbol,
            direction: direction,
            entryPrice: entryPrice,
            entryTime: Date.now() - (60 * 60 * 1000), // Assume 1 hour ago (we don't know actual time)
            positionSize: positionSizeUSD,
            leverage: config.leverage,
            stopLossPrice: stopLossPrice,
            tp1Price: tp1Price,
            tp2Price: tp2Price,
            emergencyStopPrice: emergencyStopPrice,
            currentSize: positionSizeUSD,
            originalPositionSize: positionSizeUSD, // Store original size for P&L
            takeProfitPrice1: tp1Price,
            takeProfitPrice2: tp2Price,
            tp1Hit: false,
            tp2Hit: false,
            slMovedToBreakeven: false,
            slMovedToProfit: false,
            trailingStopActive: false,
            realizedPnL: 0,
            unrealizedPnL: driftPos.unrealizedPnL,
            peakPnL: driftPos.unrealizedPnL,
            peakPrice: currentPrice,
            maxFavorableExcursion: 0,
            maxAdverseExcursion: 0,
            maxFavorablePrice: currentPrice,
            maxAdversePrice: currentPrice,
            originalAdx: undefined,
            timesScaled: 0,
            totalScaleAdded: 0,
            atrAtEntry: undefined,
            runnerTrailingPercent: undefined,
            priceCheckCount: 0,
            lastPrice: currentPrice,
            lastUpdateTime: Date.now(),
          }

          await positionManager.addTrade(activeTrade)
          syncResults.added.push(driftPos.symbol)
          
          console.log(`✅ Added ${driftPos.symbol} to monitoring`)
        } catch (error) {
          console.error(`❌ Failed to add ${driftPos.symbol}:`, error)
          syncResults.errors.push(`${driftPos.symbol}: ${error instanceof Error ? error.message : 'Unknown error'}`)
        }
      }
    }

    const summary = {
      success: true,
      message: 'Position sync complete',
      results: syncResults,
      details: {
        drift_positions: driftPositions.map(p => ({
          symbol: p.symbol,
          direction: p.side,
          size: p.size,
          entry: p.entryPrice,
          pnl: p.unrealizedPnL,
        })),
        now_tracking: Array.from(positionManager.getActiveTrades().values()).map(t => ({
          symbol: t.symbol,
          direction: t.direction,
          entry: t.entryPrice,
        })),
      },
    }

    console.log('✅ Position sync complete')
    console.log(`   Added: ${syncResults.added.length}`)
    console.log(`   Removed: ${syncResults.removed.length}`)
    console.log(`   Unchanged: ${syncResults.unchanged.length}`)
    console.log(`   Errors: ${syncResults.errors.length}`)

    return NextResponse.json(summary)

  } catch (error) {
    console.error('❌ Position sync error:', error)
    return NextResponse.json(
      {
        success: false,
        error: 'Internal server error',
        message: error instanceof Error ? error.message : 'Unknown error',
      },
      { status: 500 }
    )
  }
}