export default defineEventHandler(async () => {
  try {
    const stats = await prisma.notifications.groupBy({
      by: ['status'],
      where: {
        type: 'bulk'
      },
      _count: true
    })

    const formattedStats = {
      pending: 0,
      processing: 0,
      completed: 0,
      failed: 0
    }

    stats.forEach(stat => {
      switch (stat.status) {
        case 'draft':
        case 'scheduled':
          formattedStats.pending += stat._count
          break
        case 'sending':
          formattedStats.processing += stat._count
          break
        case 'sent':
          formattedStats.completed += stat._count
          break
        case 'failed':
          formattedStats.failed += stat._count
          break
      }
    })

    return formattedStats
  } catch (error) {
    console.error('Error fetching batch stats:', error)
    throw createError({
      statusCode: 500,
      statusMessage: 'Failed to fetch batch statistics'
    })
  }
})