import { Collection } from "@discordjs/collection";
import { connectWiseApi } from "../../../constants";

export interface CWMember {
  id: number;
  identifier: string;
  firstName: string;
  lastName: string;
  officeEmail: string;
  inactiveFlag: boolean;
  _info: Record<string, string>;
}

/**
 * Fetch All CW Members
 *
 * Fetches every member from ConnectWise using pagination and returns them
 * in a Collection keyed by their identifier (e.g. "jroberts").
 *
 * @param opts.conditions - Optional CW conditions string to filter members
 * @returns {Promise<Collection<string, CWMember>>} Collection of CW members keyed by identifier
 */
export const fetchAllCwMembers = async (opts?: {
  conditions?: string;
}): Promise<Collection<string, CWMember>> => {
  const members = new Collection<string, CWMember>();
  const pageSize = 1000;
  const conditionsParam = opts?.conditions
    ? `&conditions=${encodeURIComponent(opts.conditions)}`
    : "";

  const { data: countData } = await connectWiseApi.get(
    `/system/members/count${conditionsParam ? `?${conditionsParam.slice(1)}` : ""}`,
  );
  const totalPages = Math.ceil(countData.count / pageSize);

  for (let page = 0; page < totalPages; page++) {
    const { data } = await connectWiseApi.get<CWMember[]>(
      `/system/members?page=${page + 1}&pageSize=${pageSize}${conditionsParam}`,
    );

    for (const member of data) {
      members.set(member.identifier, member);
    }
  }

  return members;
};

/**
 * Find CW Member Identifier by Email
 *
 * Looks up a ConnectWise member whose `officeEmail` matches the provided
 * email address (case-insensitive) and returns their `identifier` string
 * (e.g. "jroberts"). Returns `null` if no match is found.
 *
 * @param email - The email address to search for
 * @param members - Optional pre-fetched member collection to search against (avoids extra API call)
 * @returns {Promise<string | null>} The CW identifier or null
 */
export const findCwIdentifierByEmail = async (
  email: string,
  members?: Collection<string, CWMember>,
): Promise<string | null> => {
  const allMembers = members ?? (await fetchAllCwMembers());
  const normalised = email.toLowerCase();

  const match = allMembers.find(
    (m) => m.officeEmail?.toLowerCase() === normalised,
  );

  return match?.identifier ?? null;
};