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const defaults = require("../config/defaults");

/**
 * Finds documents based on the specified queries.
 *
 * @param {Object} options - Options for the find operation.
 * @param {Object} options.model - The Mongoose model to perform the find operation on.
 * @param {Object} options.queries - Query parameters for the find operation.
 * @param {number} [options.queries.page=1] - The page number for pagination.
 * @param {number} [options.queries.limit=10] - The maximum number of documents to return per page.
 * @param {string} [options.queries.search] - The search query string to filter documents. Search need to be sent "field:value", where "field" is the field to search in and "value" is the regex to search.
 * @param {string} [options.queries.paginate='false'] - Flag to determine if pagination should be applied.
 * @param {Object} [options.queries.filter] - Additional filter criteria for the find operation.
 * @param {string} [options.queries.sortBy] - The field by which to sort the results. A string in the format "field:order", where "field" is the field to sort by and "order" is either "asc" or "desc".
 * @param {string} [options.queries.populate] - The field to populate in the result documents.
 *
 * @returns {Object} - An object containing the results of the find operation.
 * @returns {Array} [Object.docs] - An array of found documents.
 * @returns {number} [Object.page] - The current page number.
 * @returns {boolean} [Object.hasNext] - A flag indicating whether there are more documents beyond the current page.
 * @throws {Error} - Throws an error if the find operation encounters an issue.
 */
module.exports.find = async ({ model, queries }) => {
  try {
    const { page = 1, limit = 10 } = queries;

    if (
      typeof queries.filter === "string" &&
      queries.filter.startsWith('{"') &&
      queries.filter.endsWith("}")
    ) {
      queries.filter = JSON.parse(queries.filter);
    }

    if (queries.search) {
      // Apply search filter if search query is provided
      const search = queries.search;
      const split = search.split(":");
      queries.filter = {
        [split[0]]: { $regex: split[1], $options: "i" },
      };
    }

    queries.sortBy = queries.sortBy && {
      [queries.sortBy.split(":")[0]]: queries.sortBy.endsWith("desc") ? -1 : 1,
    };

    // Perform find operation based on provided queries
    if (queries.paginate === "false" || queries.filter) {
      const docs = await model
        .find(queries.filter && queries.filter)
        .sort({ ...(!queries.sortBy ? { createdAt: -1 } : queries.sortBy) })
        [queries.populate ? "populate" : "then"](queries.populate);
      return docs;
    }

    // Perform paginated find operation and count total documents
    const skip = (page - 1) * limit;
    const [docs, total] = await Promise.all([
      model
        .find(queries.filter && queries.filter)
        .limit(limit)
        .skip(skip)
        .sort({
          ...(!queries.sortBy ? { createdAt: -1 } : queries.sortBy),
        })
        [queries.populate ? "populate" : "then"](queries.populate),
      model.countDocuments(),
    ]);

    // Determine hasNext flag based on pagination
    const hasNext = total > skip + limit;
    const hasPrev = page > 1;
    return {
      docs,
      page: +page,
      limit: +limit,
      totalPage: Math.ceil(total / limit),
      totalDocs: total,
      hasNext,
      hasPrev,
    };
  } catch (err) {
    console.log(err);
  }
};

module.exports.create = async ({ model, key }) => {
  try {
    const elem = await new model(key);
    const res = await elem.save();
    key.populate && (await res.populate(key.populate));
    return res;
  } catch (e) {
    console.log(e);
  }
};

module.exports.getTransformedItems = ({ items = [], selection = [] }) => {
  if (!Array.isArray(items) || !Array.isArray(selection)) {
    throw new Error("Invalid selection");
  }

  if (selection.length === 0) {
    return items.map((item) => ({ ...item }));
  }

  return items.map((item) => {
    const result = {};
    selection.forEach((key) => {
      result[key] = item[key];
    });
    return result;
  });
};

module.exports.getPagination = ({
  totalItems = defaults.totalItems,
  limit = defaults.limit,
  page = defaults.page,
}) => {
  const totalPage = Math.ceil(totalItems / limit);

  const pagination = {
    page,
    limit,
    totalItems,
    totalPage,
  };

  if (page < totalPage) {
    pagination.next = page + 1;
  }

  if (page > 1) {
    pagination.prev = page - 1;
  }

  return pagination;
};
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