import { INestApplicationContext } from '@nestjs/common';
import type { Suggestion } from '../../generated/prisma';
import { PrismaService } from '../../src/prisma/prisma.service';
import { SuggestionsService } from '../../src/suggestions/suggestions.service';
import type { ProposeInput } from '../../src/suggestions/suggestion.types';

/**
 * Proposes a suggestion in its own transaction, as a rule handler would.
 * Throws when nothing was proposed (anchor or intent already taken), so a
 * test never works with a suggestion that does not exist.
 */
export async function proposeForTest(
  app: INestApplicationContext,
  input: ProposeInput,
): Promise<Suggestion> {
  const prisma = app.get(PrismaService);
  const service = app.get(SuggestionsService);
  const created = await prisma.$transaction((tx) =>
    service.proposeIn(tx, input),
  );
  if (created === null) {
    throw new Error(`proposeForTest: nothing proposed for ${input.anchor}`);
  }
  return created;
}