/**
 * Position Manager Health Check
 * 
 * CRITICAL: Verifies Position Manager is actually monitoring positions
 * 
 * Bug History:
 * - $1,000+ losses because Position Manager logged "added" but never monitored
 * - Silent SL placement failures left positions unprotected
 * - Orphan detection cancelled orders on active positions
 * 
 * This health check runs every 30 seconds to detect these critical failures.
 * 
 * Created: Dec 8, 2025
 */

import { getInitializedPositionManager } from '../trading/position-manager'
import { getOpenTrades } from '../database/trades'
import { getDriftService } from '../drift/client'

export interface HealthCheckResult {
  isHealthy: boolean
  issues: string[]
  warnings: string[]
  info: {
    dbOpenTrades: number
    pmActiveTrades: number
    pmMonitoring: boolean
    driftPositions: number
    unprotectedPositions: number
  }
}

/**
 * Check Position Manager health
 * 
 * CRITICAL CHECKS:
 * 1. If DB has open trades, Position Manager MUST be monitoring
 * 2. If Position Manager has trades, monitoring MUST be active
 * 3. All open positions MUST have TP/SL orders on-chain
 * 4. Position Manager trade count MUST match Drift position count
 */
export async function checkPositionManagerHealth(): Promise<HealthCheckResult> {
  const issues: string[] = []
  const warnings: string[] = []
  
  try {
    // Get database open trades
    const dbTrades = await getOpenTrades()
    const dbOpenCount = dbTrades.length
    
    // Get Position Manager state
    const pm = await getInitializedPositionManager()
    const pmState = (pm as any)
    const pmActiveTrades = pmState.activeTrades?.size || 0
    const pmMonitoring = pmState.isMonitoring || false
    
    // Get Drift positions
    const driftService = getDriftService()
    const positions = await driftService.getAllPositions()
    const driftPositions = positions.filter(p => Math.abs(p.size) > 0).length
    
    // CRITICAL CHECK #1: DB has open trades but PM not monitoring
    if (dbOpenCount > 0 && !pmMonitoring) {
      issues.push(`❌ CRITICAL: ${dbOpenCount} open trades in DB but Position Manager NOT monitoring!`)
      issues.push(`   This means NO TP/SL protection, NO monitoring, UNCONTROLLED RISK`)
      issues.push(`   ACTION REQUIRED: Restart container to restore monitoring`)
    }
    
    // CRITICAL CHECK #2: PM has trades but not monitoring
    if (pmActiveTrades > 0 && !pmMonitoring) {
      issues.push(`❌ CRITICAL: Position Manager has ${pmActiveTrades} active trades but monitoring is OFF!`)
      issues.push(`   This is the $1,000 loss bug - trades "added" but never monitored`)
      issues.push(`   ACTION REQUIRED: Fix startMonitoring() function`)
    }
    
    // CRITICAL CHECK #3: DB vs PM mismatch
    if (dbOpenCount !== pmActiveTrades) {
      warnings.push(`⚠️ WARNING: DB has ${dbOpenCount} open trades, PM has ${pmActiveTrades} active trades`)
      warnings.push(`   Possible orphaned position or monitoring not started`)
    }
    
    // CRITICAL CHECK #4: PM vs Drift mismatch
    if (pmActiveTrades !== driftPositions) {
      warnings.push(`⚠️ WARNING: Position Manager has ${pmActiveTrades} trades, Drift has ${driftPositions} positions`)
      warnings.push(`   Possible untracked position or external closure`)
    }
    
    // Check for unprotected positions (no SL/TP orders)
    let unprotectedPositions = 0
    for (const trade of dbTrades) {
      if (!trade.slOrderTx && !trade.softStopOrderTx && !trade.hardStopOrderTx) {
        unprotectedPositions++
        issues.push(`❌ CRITICAL: Position ${trade.symbol} (${trade.id}) has NO STOP LOSS ORDERS!`)
        issues.push(`   Entry: $${trade.entryPrice}, Size: $${trade.positionSizeUSD}`)
        issues.push(`   This is the silent SL placement failure bug`)
      }
      
      if (!trade.tp1OrderTx) {
        warnings.push(`⚠️ Position ${trade.symbol} missing TP1 order`)
      }
      
      if (!trade.tp2OrderTx) {
        warnings.push(`⚠️ Position ${trade.symbol} missing TP2 order`)
      }
    }
    
    const isHealthy = issues.length === 0
    
    return {
      isHealthy,
      issues,
      warnings,
      info: {
        dbOpenTrades: dbOpenCount,
        pmActiveTrades,
        pmMonitoring,
        driftPositions,
        unprotectedPositions
      }
    }
    
  } catch (error) {
    issues.push(`❌ Health check failed: ${error instanceof Error ? error.message : String(error)}`)
    
    return {
      isHealthy: false,
      issues,
      warnings,
      info: {
        dbOpenTrades: 0,
        pmActiveTrades: 0,
        pmMonitoring: false,
        driftPositions: 0,
        unprotectedPositions: 0
      }
    }
  }
}

/**
 * Start periodic health checks
 */
export function startPositionManagerHealthMonitor(): void {
  console.log('🏥 Starting Position Manager health monitor (every 30 seconds)...')
  
  // Initial check
  checkPositionManagerHealth().then(result => {
    logHealthCheckResult(result)
  })
  
  // Periodic checks every 30 seconds
  setInterval(async () => {
    const result = await checkPositionManagerHealth()
    
    // Only log if there are issues or warnings
    if (!result.isHealthy || result.warnings.length > 0) {
      logHealthCheckResult(result)
    }
  }, 30000) // 30 seconds
}

function logHealthCheckResult(result: HealthCheckResult): void {
  if (result.isHealthy && result.warnings.length === 0) {
    console.log('✅ Position Manager health check PASSED')
    console.log(`   DB: ${result.info.dbOpenTrades} open | PM: ${result.info.pmActiveTrades} active | Monitoring: ${result.info.pmMonitoring ? 'YES' : 'NO'} | Drift: ${result.info.driftPositions} positions`)
    return
  }
  
  console.log('\n🏥 POSITION MANAGER HEALTH CHECK REPORT:')
  console.log('━'.repeat(80))
  
  if (result.issues.length > 0) {
    console.log('\n🔴 CRITICAL ISSUES:')
    result.issues.forEach(issue => console.log(issue))
  }
  
  if (result.warnings.length > 0) {
    console.log('\n⚠️  WARNINGS:')
    result.warnings.forEach(warning => console.log(warning))
  }
  
  console.log('\n📊 SYSTEM STATE:')
  console.log(`   Database open trades: ${result.info.dbOpenTrades}`)
  console.log(`   Position Manager active trades: ${result.info.pmActiveTrades}`)
  console.log(`   Position Manager monitoring: ${result.info.pmMonitoring ? '✅ YES' : '❌ NO'}`)
  console.log(`   Drift open positions: ${result.info.driftPositions}`)
  console.log(`   Unprotected positions: ${result.info.unprotectedPositions}`)
  
  console.log('━'.repeat(80))
}