import { NextRequest, NextResponse } from 'next/server'
import { statsCollectionService } from '@/lib/services/stats-collection-service'

/**
 * GET /api/cron/cleanup-stats
 * Delete stats snapshots older than 90 days
 *
 * This endpoint is designed to be called by a daily cron job.
 * It should be protected by a secret token in production.
 *
 * Example cron schedule: Once per day at 3am
 * Vercel cron config in vercel.json:
 * {
 *   "crons": [
 *     { "path": "/api/cron/cleanup-stats", "schedule": "0 3 * * *" }
 *   ]
 * }
 */
export async function GET(request: NextRequest) {
  // Verify cron secret (for security in production)
  const cronSecret = process.env.CRON_SECRET
  const authHeader = request.headers.get('authorization')

  if (cronSecret && authHeader !== `Bearer ${cronSecret}`) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  }

  try {
    const startTime = Date.now()
    const deletedCount = await statsCollectionService.cleanupOldSnapshots()
    const duration = Date.now() - startTime

    return NextResponse.json({
      success: true,
      message: `Cleaned up ${deletedCount} old stats snapshots`,
      deleted: deletedCount,
      duration: `${duration}ms`,
      retentionDays: 90,
      timestamp: new Date().toISOString()
    })
  } catch (error) {
    console.error('Cron job failed - cleanup-stats:', error)
    return NextResponse.json(
      {
        error: 'Stats cleanup failed',
        message: error instanceof Error ? error.message : 'Unknown error'
      },
      { status: 500 }
    )
  }
}

// Also support POST for flexibility
export async function POST(request: NextRequest) {
  return GET(request)
}