import { and, eq } from 'drizzle-orm'
import { useDb } from '~~/server/database/client'
import { expenseParticipants, expenses, participants } from '~~/server/database/schema'

export default defineEventHandler(async (event) => {
  const slug = getRouterParam(event, 'slug')!
  const id = Number(getRouterParam(event, 'id'))
  await getPotOrThrow(slug)

  const db = useDb()
  const [existing] = await db.select().from(participants).where(and(eq(participants.id, id), eq(participants.potSlug, slug)))
  if (!existing) {
    throw createError({ statusCode: 404, statusMessage: 'Participant not found' })
  }

  const [asPayer] = await db.select().from(expenses).where(eq(expenses.payerId, id)).limit(1)
  const [asSplit] = await db.select().from(expenseParticipants).where(eq(expenseParticipants.participantId, id)).limit(1)
  if (asPayer || asSplit) {
    throw createError({ statusCode: 409, statusMessage: 'Cannot remove a participant with expenses or payments' })
  }

  await db.delete(participants).where(eq(participants.id, id))

  return { success: true }
})