import { createError, readBody } from 'h3'
import { prisma } from '../../utils/db'
import { requireUser } from '../../utils/auth'

const currencies = new Set(['KRW', 'USD', 'JPY'])

export default defineEventHandler(async (event) => {
  const user = await requireUser(event)
  const body = await readBody<{
    primaryCurrency?: string
    monthStartDay?: number
    weekStartDay?: number
  }>(event)

  const primaryCurrency = body.primaryCurrency || 'KRW'
  const monthStartDay = Number(body.monthStartDay || 1)
  const weekStartDay = Number(body.weekStartDay ?? 0)

  if (!currencies.has(primaryCurrency)) {
    throw createError({ statusCode: 400, statusMessage: 'Invalid currency' })
  }
  if (!Number.isInteger(monthStartDay) || monthStartDay < 1 || monthStartDay > 28) {
    throw createError({ statusCode: 400, statusMessage: 'Invalid month start day' })
  }
  if (!Number.isInteger(weekStartDay) || weekStartDay < 0 || weekStartDay > 6) {
    throw createError({ statusCode: 400, statusMessage: 'Invalid week start day' })
  }

  return prisma.userSetting.upsert({
    where: { userId: user.id },
    update: { primaryCurrency, monthStartDay, weekStartDay },
    create: { userId: user.id, primaryCurrency, monthStartDay, weekStartDay }
  })
})