import { setHeader } from 'h3'
import { prisma } from '../../utils/db'
import { requireUser } from '../../utils/auth'

export default defineEventHandler(async (event) => {
  const user = await requireUser(event)
  const rows = await prisma.transaction.findMany({
    where: { userId: user.id },
    include: { asset: true, category: { include: { parent: true } } },
    orderBy: { occurredAt: 'desc' }
  })

  const escape = (value: unknown) => `"${String(value ?? '').replaceAll('"', '""')}"`
  const lines = [
    ['id', 'type', 'occurredAt', 'asset', 'category', 'amount', 'title', 'memo', 'latitude', 'longitude'].map(escape).join(','),
    ...rows.map(row => [
      row.id,
      row.type,
      row.occurredAt.toISOString(),
      row.asset.name,
      row.category.parent ? `${row.category.parent.name} > ${row.category.name}` : row.category.name,
      row.amount,
      row.title,
      row.memo,
      row.latitude,
      row.longitude
    ].map(escape).join(','))
  ]

  setHeader(event, 'content-type', 'text/csv; charset=utf-8')
  setHeader(event, 'content-disposition', 'attachment; filename="transactions.csv"')
  return lines.join('\n')
})