import { setHeader } from 'h3'
import { format } from 'date-fns'
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 categoryName = (row: typeof rows[number]) => row.category.name
  const parentCategoryName = (row: typeof rows[number]) => row.category.parent?.name || ''
  const lines = [
    ['날짜', '유형', '자산', '상위분류', '분류', '금액', '내용', '메모', '위도', '경도', '거래ID'].map(escape).join(','),
    ...rows.map(row => [
      format(row.occurredAt, 'yyyy-MM-dd'),
      row.type === 'income' ? '수입' : '지출',
      row.asset.name,
      parentCategoryName(row),
      categoryName(row),
      row.amount,
      row.title,
      row.memo,
      row.latitude,
      row.longitude,
      row.id
    ].map(escape).join(','))
  ]

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