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(event);
  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 };
});