/*
 * Wazuh app - Elasticsearch data table raw response parser
 * Copyright (C) 2015-2019 Wazuh, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Find more information about this on the LICENSE file.
 */

/**
 * Aggregation which starts in level 2
 * @param {*} data_set The raw response.
 */
const parse_start_2 = data_set => {
  const tree = {};
  for (const main_bucket of data_set.aggregations['2'].buckets) {
    if (!tree[main_bucket.key]) tree[main_bucket.key] = {};
    if (main_bucket['3'] && main_bucket['3'].buckets) {
      for (const sub_bucket of main_bucket['3'].buckets) {
        if (!tree[main_bucket.key][sub_bucket.key])
          tree[main_bucket.key][sub_bucket.key] = {};

        if (sub_bucket['4'] && sub_bucket['4'].buckets) {
          for (const sub_sub_bucket of sub_bucket['4'].buckets) {
            if (!tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key])
              tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key] = {};

            if (sub_sub_bucket['5'] && sub_sub_bucket['5'].buckets) {
              for (const sub_sub_sub_bucket of sub_sub_bucket['5'].buckets) {
                if (
                  !tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key][
                    sub_sub_sub_bucket.key
                  ]
                ) {
                  tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key][
                    sub_sub_sub_bucket.key
                  ] = {};
                  tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key][
                    sub_sub_sub_bucket.key
                  ][sub_sub_sub_bucket.doc_count] = false;
                }
              }
            } else {
              tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key] = {};
              tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key][
                sub_sub_bucket.doc_count
              ] = false;
            }
          }
        }

        if (sub_bucket['5'] && sub_bucket['5'].buckets) {
          for (const sub_sub_bucket of sub_bucket['5'].buckets) {
            if (!tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key]) {
              tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key] = {};
              tree[main_bucket.key][sub_bucket.key][sub_sub_bucket.key][
                sub_sub_bucket.doc_count
              ] = false;
            }
          }
        }

        if (
          !(sub_bucket['4'] && sub_bucket['4'].buckets) &&
          !(sub_bucket['5'] && sub_bucket['5'].buckets)
        ) {
          tree[main_bucket.key][sub_bucket.key] = {};
          tree[main_bucket.key][sub_bucket.key][sub_bucket.doc_count] = false;
        }
      }
    } else {
      tree[main_bucket.key] = {};
      tree[main_bucket.key][main_bucket.doc_count] = false;
    }
  }
  return tree;
};

/**
 * Aggregation which starts in level 3
 * @param {*} data_set The raw response.
 */
const parse_start_3 = data_set => {
  const tree = {};

  for (const sub_bucket of data_set.aggregations['3'].buckets) {
    if (!tree[sub_bucket.key]) tree[sub_bucket.key] = {};

    if (sub_bucket['4'] && sub_bucket['4'].buckets) {
      for (const sub_sub_bucket of sub_bucket['4'].buckets) {
        if (!tree[sub_bucket.key][sub_sub_bucket.key])
          tree[sub_bucket.key][sub_sub_bucket.key] = {};

        if (sub_sub_bucket['5'] && sub_sub_bucket['5'].buckets) {
          for (const sub_sub_sub_bucket of sub_sub_bucket['5'].buckets) {
            if (
              !tree[sub_bucket.key][sub_sub_bucket.key][sub_sub_sub_bucket.key]
            ) {
              tree[sub_bucket.key][sub_sub_bucket.key][
                sub_sub_sub_bucket.key
              ] = {};
              tree[sub_bucket.key][sub_sub_bucket.key][sub_sub_sub_bucket.key][
                sub_sub_sub_bucket.doc_count
              ] = false;
            }
          }
        } else {
          tree[sub_bucket.key][sub_sub_bucket.key] = {};
          tree[sub_bucket.key][sub_sub_bucket.key][
            sub_sub_bucket.doc_count
          ] = false;
        }
      }
    }

    if (sub_bucket['5'] && sub_bucket['5'].buckets) {
      for (const sub_sub_bucket of sub_bucket['5'].buckets) {
        if (!tree[sub_bucket.key][sub_sub_bucket.key]) {
          tree[sub_bucket.key][sub_sub_bucket.key] = {};
          tree[sub_bucket.key][sub_sub_bucket.key][
            sub_sub_bucket.doc_count
          ] = false;
        }
      }
    }

    if (
      !(sub_bucket['4'] && sub_bucket['4'].buckets) &&
      !(sub_bucket['5'] && sub_bucket['5'].buckets)
    ) {
      tree[sub_bucket.key] = {};
      tree[sub_bucket.key][sub_bucket.doc_count] = false;
    }
  }

  return tree;
};

/**
 * Aggregation which starts in level 3 and continues with level 2 buckets
 * @param {*} data_set The raw response.
 */
const parse_start_3_mix_2 = data_set => {
  const tree = {};

  for (const sub_bucket of data_set.aggregations['3'].buckets) {
    if (!tree[sub_bucket.key]) tree[sub_bucket.key] = {};

    if (sub_bucket['2'] && sub_bucket['2'].buckets) {
      for (const sub_sub_bucket of sub_bucket['2'].buckets) {
        if (!tree[sub_bucket.key][sub_sub_bucket.key])
          tree[sub_bucket.key][sub_sub_bucket.key] = {};

        if (sub_sub_bucket['6'] && sub_sub_bucket['6'].buckets) {
          for (const sub_sub_sub_bucket of sub_sub_bucket['6'].buckets) {
            if (
              !tree[sub_bucket.key][sub_sub_bucket.key][sub_sub_sub_bucket.key]
            ) {
              tree[sub_bucket.key][sub_sub_bucket.key][
                sub_sub_sub_bucket.key
              ] = {};
              tree[sub_bucket.key][sub_sub_bucket.key][sub_sub_sub_bucket.key][
                sub_sub_sub_bucket.doc_count
              ] = false;
            }
          }
        } else {
          tree[sub_bucket.key][sub_sub_bucket.key] = {};
          tree[sub_bucket.key][sub_sub_bucket.key][
            sub_sub_bucket.doc_count
          ] = false;
        }
      }
    }
  }

  return tree;
};

/**
 * Generates a hierarchical tree from the raw response.
 * @param {*} data_set The raw response. Must have aggregations and buckets for level 0.
 */
const generate_tree = data_set => {
  // If we have no aggregations just return empty object
  if (!data_set || !data_set.aggregations) {
    return {};
  }

  // If the aggregation from Elasticsearch starts using level 2
  if (data_set.aggregations['2'] && data_set.aggregations['2'].buckets) {
    return parse_start_2(data_set);
  }

  // If the aggregation from Elasticsearch starts using level 3 and continues using level 2
  if (
    data_set.aggregations['3'] &&
    data_set.aggregations['3'].buckets &&
    data_set.aggregations['3'].buckets[0] &&
    data_set.aggregations['3'].buckets[0]['2'] &&
    data_set.aggregations['3'].buckets[0]['2'].buckets
  ) {
    return parse_start_3_mix_2(data_set);
  }

  // If the aggregation from Elasticsearch starts using level 3
  if (data_set.aggregations['3'] && data_set.aggregations['3'].buckets) {
    return parse_start_3(data_set);
  }

  // If none of the above conditions are true, return empty object
  return {};
};

/**
 * Generates a matrix which includes each parsed row
 * @param {*} item Hierarchical tree generated from a raw response
 */
const generate_rows = item => {
  const iter = (r, p) => {
    const keys = Object.keys(r);
    if (keys.length) {
      return keys.forEach(x => iter(r[x], p.concat(x)));
    }
    result.push(p);
  };
  const result = [];
  iter(item, []);
  return result;
};

/**
 * Public function to enter the module.
 * Always returns an array (could be empty)
 * @param {*} data_set The raw response.
 */
export default (data_set, cols) => {
  try {
    const tree = generate_tree(data_set);

    const min_size = cols.length;

    // Minimum validation for the generated tree
    if (!tree || !Object.keys(tree) || !Object.keys(tree).length) return [];

    // All rows must have same length
    const rows = generate_rows(tree).filter(item => item.length === min_size);

    return rows;
  } catch (error) {
    return [];
  }
};