gruperly/apps/backend/src/modules/group-waitlist/lib/helpers.ts

import type { Group, PrismaClient } from '@generated/prisma/client';
import type { GroupWaitlistEntryDto, ProblemDetails, Result } from '@gruperly/shared';
import { err, ok } from '@gruperly/shared';
import { noGroupAccessProblem, notFoundResourceProblem } from '@/http/problem-builders';

export type GroupWaitlistEntryRecord = {
  id: string;
  groupId: string;
  fullName: string;
  phone: string;
  email: string | null;
  notes: string | null;
  status: GroupWaitlistEntryDto['status'];
  createdAt: Date;
  updatedAt: Date;
};

export function toGroupWaitlistEntryDto(record: GroupWaitlistEntryRecord): GroupWaitlistEntryDto {
  return {
    id: record.id,
    groupId: record.groupId,
    fullName: record.fullName,
    phone: record.phone,
    email: record.email,
    notes: record.notes,
    status: record.status,
    createdAt: record.createdAt.toISOString(),
    updatedAt: record.updatedAt.toISOString(),
  };
}

export async function findGroupForUser(
  db: Pick<PrismaClient, 'group'>,
  groupId: string,
  userId: string,
): Promise<Result<Group, ProblemDetails>> {
  const group = await db.group.findUnique({
    where: { id: groupId },
    include: { members: { where: { userId } } },
  });
  if (!group) {
    return err(notFoundResourceProblem('Group', groupId));
  }
  const isOwner = group.createdById === userId;
  const isMember = group.members.length > 0;
  if (!isOwner && !isMember) {
    return err(noGroupAccessProblem());
  }
  return ok(group);
}

export async function findGroupOwnedByUser(
  db: Pick<PrismaClient, 'group'>,
  groupId: string,
  userId: string,
): Promise<Result<Group, ProblemDetails>> {
  const group = await db.group.findUnique({ where: { id: groupId } });
  if (!group) {
    return err(notFoundResourceProblem('Group', groupId));
  }
  if (group.createdById !== userId) {
    return err(noGroupAccessProblem());
  }
  return ok(group);
}