/**
 * Position Manager Startup Initialization
 * 
 * Ensures Position Manager starts monitoring on bot startup
 * This prevents orphaned trades when the bot restarts
 */

import { getInitializedPositionManager } from '../trading/position-manager'
import { initializeDriftService } from '../drift/client'
import { getPrismaClient } from '../database/trades'
import { getMarketConfig } from '../../config/trading'

let initStarted = false

export async function initializePositionManagerOnStartup() {
  if (initStarted) {
    return
  }
  
  initStarted = true
  
  console.log('🚀 Initializing Position Manager on startup...')
  
  try {
    // CRITICAL: Run database sync validator FIRST to clean up duplicates
    const { validateAllOpenTrades } = await import('../database/sync-validator')
    console.log('🔍 Running database sync validation before Position Manager init...')
    const validationResult = await validateAllOpenTrades()
    
    if (validationResult.ghosts > 0) {
      console.log(`✅ Cleaned up ${validationResult.ghosts} ghost/duplicate trades`)
    }
    
    // Then validate open trades against Drift positions
    await validateOpenTrades()
    
    const manager = await getInitializedPositionManager()
    const status = manager.getStatus()
    
    console.log(`✅ Position Manager ready - ${status.activeTradesCount} active trades`)
    
    if (status.activeTradesCount > 0) {
      console.log(`📊 Monitoring: ${status.symbols.join(', ')}`)
    }
  } catch (error) {
    console.error('❌ Failed to initialize Position Manager on startup:', error)
  }
}

/**
 * Validate that open trades in database match actual Drift positions
 * 
 * CRITICAL FIX (Nov 14, 2025):
 * - Also checks trades marked as "closed" in DB that might still be open on Drift
 * - Happens when close transaction fails but bot marks it as closed anyway
 * - Restores Position Manager tracking for these orphaned positions
 */
async function validateOpenTrades() {
  try {
    const prisma = getPrismaClient()
    
    // Get both truly open trades AND recently "closed" trades (last 24h)
    // Recently closed trades might still be open if close transaction failed
    // TEMPORARILY REDUCED: Check only last 5 closed trades to avoid rate limiting on startup
    const [openTrades, recentlyClosedTrades] = await Promise.all([
      prisma.trade.findMany({
        where: { status: 'open' },
        orderBy: { entryTime: 'asc' }
      }),
      prisma.trade.findMany({
        where: {
          exitReason: { not: null },
          exitTime: { gte: new Date(Date.now() - 6 * 60 * 60 * 1000) } // Last 6 hours (reduced from 24h)
        },
        orderBy: { exitTime: 'desc' },
        take: 5 // Reduced from 20 to avoid rate limiting
      })
    ])
    
    const allTradesToCheck = [...openTrades, ...recentlyClosedTrades]
    
    if (allTradesToCheck.length === 0) {
      console.log('✅ No open trades to validate')
      return
    }
    
    console.log(`🔍 Validating ${openTrades.length} open + ${recentlyClosedTrades.length} recently closed trades against Drift...`)
    
    // CRITICAL: Group trades by symbol to handle multiple DB entries for same Drift position
    // This prevents reopening old closed trades when only the most recent should be restored
    const tradesBySymbol = new Map<string, any[]>()
    for (const trade of allTradesToCheck) {
      const existing = tradesBySymbol.get(trade.symbol) || []
      existing.push(trade)
      tradesBySymbol.set(trade.symbol, existing)
    }
    
    const driftService = await initializeDriftService()
    const driftPositions = await driftService.getAllPositions() // Get all positions once
    
    // Process each symbol's trades (keep only most recent if multiple exist)
    for (const [symbol, trades] of tradesBySymbol) {
      // Sort by creation time, newest first
      trades.sort((a, b) => b.createdAt.getTime() - a.createdAt.getTime())
      const mostRecentTrade = trades[0]
      const olderTrades = trades.slice(1)
      
      // Close any older trades BEFORE validating the most recent
      for (const oldTrade of olderTrades) {
        if (oldTrade.exitReason === null) {
          console.log(`🗑️ Closing duplicate old trade: ${oldTrade.id} (${symbol}, created ${oldTrade.createdAt.toISOString()})`)
          await prisma.trade.update({
            where: { id: oldTrade.id },
            data: {
              status: 'closed',
              exitTime: new Date(),
              exitReason: 'DUPLICATE_CLEANUP',
              exitPrice: oldTrade.entryPrice,
              realizedPnL: 0,
            }
          })
        }
      }
      
      // Now validate only the most recent trade for this symbol
      const trade = mostRecentTrade
      
      try {
        const marketConfig = getMarketConfig(trade.symbol)
        
        // Find matching Drift position by symbol
        const position = driftPositions.find(p => p.symbol === trade.symbol)
        
        if (!position || position.size === 0) {
          // No position on Drift
          if (trade.status === 'open') {
            console.log(`⚠️ PHANTOM TRADE: ${trade.symbol} marked open in DB but not found on Drift`)
            console.log(`   🗑️ Auto-closing phantom trade...`)
            
            await prisma.trade.update({
              where: { id: trade.id },
              data: {
                status: 'closed',
                exitTime: new Date(),
                exitReason: 'PHANTOM_TRADE_CLEANUP',
                exitPrice: trade.entryPrice,
                realizedPnL: 0,
                realizedPnLPercent: 0,
              }
            })
          }
          // If already closed in DB and not on Drift, that's correct - skip
          continue
        }
        
        // Position EXISTS on Drift
        const driftDirection = position.side.toLowerCase() as 'long' | 'short'
        
        if (driftDirection !== trade.direction) {
          console.log(`⚠️ DIRECTION MISMATCH: ${trade.symbol} DB=${trade.direction} Drift=${driftDirection}`)
          continue
        }
        
        // CRITICAL: If DB says closed but Drift shows open, restore tracking!
        if (trade.exitReason !== null) {
          console.log(`🔴 CRITICAL: ${trade.symbol} marked as CLOSED in DB but still OPEN on Drift!`)
          console.log(`   DB entry: $${trade.entryPrice.toFixed(2)} | Drift entry: $${position.entryPrice.toFixed(2)}`)
          console.log(`   DB exit: ${trade.exitReason} at ${trade.exitTime?.toISOString()}`)
          console.log(`   Drift: ${position.size} ${trade.symbol} ${driftDirection} @ $${position.entryPrice.toFixed(2)}`)
          console.log(`   🔄 Reopening trade and correcting entry price to match Drift...`)
          
          // Calculate position size in USD using Drift's entry price
          const currentPrice = await driftService.getOraclePrice(marketConfig.driftMarketIndex)
          const positionSizeUSD = position.size * currentPrice
          
          await prisma.trade.update({
            where: { id: trade.id },
            data: {
              status: 'open',
              exitReason: null,
              exitTime: null,
              exitPrice: null,
              entryPrice: position.entryPrice, // CRITICAL: Use Drift's actual entry price, not DB value
              positionSizeUSD: positionSizeUSD, // Update to current size (may be runner after TP1)
              // Keep original realizedPnL from partial closes if any
            }
          })
          
          console.log(`   ✅ Trade restored with corrected entry: $${position.entryPrice.toFixed(2)} (was $${trade.entryPrice.toFixed(2)})`)
        } else {
          console.log(`✅ ${trade.symbol} ${trade.direction}: Position verified on Drift`)
        }
        
      } catch (posError) {
        console.error(`❌ Error validating trade ${trade.symbol}:`, posError)
      }
    }
    
  } catch (error) {
    console.error('❌ Error in validateOpenTrades:', error)
  }
}