import { apiRequest, getPath } from './client.js';

const DEFAULT_LIST_PAGE_LIMIT = 100;

function unwrapListPayload(payload) {
  if (Array.isArray(payload)) {
    return payload;
  }

  return payload?.data || payload?.entries || payload?.items || payload?.categories || [];
}

function hasExplicitPagination(filters = {}) {
  return (
    (filters.limit !== undefined && filters.limit !== null)
    || (filters.offset !== undefined && filters.offset !== null)
  );
}

function buildCategoryQuery(filters = {}) {
  const query = {};
  const searchName = filters.searchName || filters.search_name;
  if (searchName) {
    query.search_name = searchName;
  }

  if (filters.active !== undefined && filters.active !== null && filters.active !== '') {
    query.active = Boolean(filters.active);
  }

  if (filters.orderBy || filters.order_by) {
    query.order_by = filters.orderBy || filters.order_by;
  }

  if (filters.orderDir || filters.order_dir) {
    query.order_dir = filters.orderDir || filters.order_dir;
  }

  if (filters.expanded !== undefined && filters.expanded !== null && filters.expanded !== '') {
    query.expanded = Boolean(filters.expanded);
  }

  return query;
}

async function fetchAllCategoryPages(store, baseQuery = {}) {
  const items = [];
  let offset = 0;

  while (true) {
    const payload = await apiRequest(store, getPath('categories'), {
      query: {
        ...baseQuery,
        limit: DEFAULT_LIST_PAGE_LIMIT,
        offset,
      },
    });
    const pageItems = unwrapListPayload(payload);
    items.push(...pageItems);

    if (pageItems.length < DEFAULT_LIST_PAGE_LIMIT) {
      break;
    }

    offset += DEFAULT_LIST_PAGE_LIMIT;
  }

  return items;
}

export async function listCategories(store, filters = {}) {
  const baseQuery = buildCategoryQuery(filters);

  if (hasExplicitPagination(filters)) {
    const query = { ...baseQuery };
    if (filters.limit !== undefined && filters.limit !== null) {
      query.limit = filters.limit;
    }
    if (filters.offset !== undefined && filters.offset !== null) {
      query.offset = filters.offset;
    }

    const payload = await apiRequest(store, getPath('categories'), {
      query,
    });
    return unwrapListPayload(payload);
  }

  return fetchAllCategoryPages(store, baseQuery);
}