import { PrismaClient, Prisma } from "@linkwarden/prisma/client";

const prisma = new PrismaClient();

/**
 * Fetches the first and last X links from the database based on the provided conditions.
 * @param prisma - Prisma client instance
 * @param params - Prisma query parameters (optional)
 * @returns A list of links
 */
const getLinkBatch = async <T extends Prisma.LinkFindManyArgs>(
  params: T
): Promise<Array<Prisma.LinkGetPayload<T>>> => {
  try {
    const { where = {}, take = 10, orderBy, include } = params;

    let oldToNew: any = [];

    const firstTake = Math.floor(take / 2);
    const secondTake = Math.ceil(take / 2);

    if (firstTake > 0)
      oldToNew = await prisma.link.findMany({
        where,
        take: firstTake,
        orderBy: orderBy ?? { id: "asc" },
        include,
      });

    let newToOld: any = [];

    if (secondTake > 0)
      newToOld = await prisma.link.findMany({
        where,
        take: secondTake,
        orderBy: orderBy ?? { id: "desc" },
        include,
      });

    const links = [...oldToNew, ...newToOld]
      // Make sure we don't process the same link twice
      .filter((value, index, self) => {
        return self.findIndex((item) => item.id === value.id) === index;
      });

    return links as Array<Prisma.LinkGetPayload<T>>;
  } catch (error) {
    console.error("getLinkBatch error, returning empty array instead:", error);
    return [] as Array<Prisma.LinkGetPayload<T>>;
  }
};

export default getLinkBatch;