import { db } from "#server/db";
import * as tables from "#server/db/schema";
import { and, eq, ne } from "drizzle-orm";

const UNIQUE_FIELDS = ["name", "path", "url"] as const;
type UniqueField = (typeof UNIQUE_FIELDS)[number];

export const joinFields = (fields: string[]): string => {
  if (fields.length <= 1) return fields.join("");
  return `${fields.slice(0, -1).join(", ")} and ${fields.at(-1)}`;
};

export const findConflictingFields = async (
  values: Partial<Record<UniqueField, string>>,
  excludeId?: number,
): Promise<UniqueField[]> => {
  const conflicts: UniqueField[] = [];

  for (const field of UNIQUE_FIELDS) {
    const value = values[field];
    if (!value) continue;

    const conflict = await db.query.links.findFirst({
      where: and(
        eq(tables.links[field], value),
        excludeId !== undefined ? ne(tables.links.id, excludeId) : undefined,
      ),
    });

    if (conflict) conflicts.push(field);
  }

  return conflicts;
};