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'use strict';
const get = require('../get');const utils = require('../../utils');/** * Given a Mongoose index definition (key + options objects) and a MongoDB server * index definition, determine if the two indexes are equal. * * @param {Object} schemaIndexKeysObject the Mongoose index spec * @param {Object} options the Mongoose index definition's options * @param {Object} dbIndex the index in MongoDB as returned by `listIndexes()` * @api private */
module.exports = function isIndexEqual(schemaIndexKeysObject, options, dbIndex) {  // Special case: text indexes have a special format in the db. For example,  // `{ name: 'text' }` becomes:  // {  //   v: 2,  //   key: { _fts: 'text', _ftsx: 1 },  //   name: 'name_text',  //   ns: 'test.tests',  //   background: true,  //   weights: { name: 1 },  //   default_language: 'english',  //   language_override: 'language',  //   textIndexVersion: 3  // }  if (dbIndex.textIndexVersion != null) {    delete dbIndex.key._fts;    delete dbIndex.key._ftsx;    const weights = { ...dbIndex.weights, ...dbIndex.key };    if (Object.keys(weights).length !== Object.keys(schemaIndexKeysObject).length) {      return false;    }    for (const prop of Object.keys(weights)) {      if (!(prop in schemaIndexKeysObject)) {        return false;      }      const weight = weights[prop];      if (weight !== get(options, 'weights.' + prop) && !(weight === 1 && get(options, 'weights.' + prop) == null)) {        return false;      }    }
    if (options['default_language'] !== dbIndex['default_language']) {      return dbIndex['default_language'] === 'english' && options['default_language'] == null;    }
    return true;  }
  const optionKeys = [    'unique',    'partialFilterExpression',    'sparse',    'expireAfterSeconds',    'collation'  ];  for (const key of optionKeys) {    if (!(key in options) && !(key in dbIndex)) {      continue;    }    if (key === 'collation') {      if (options[key] == null || dbIndex[key] == null) {        return options[key] == null && dbIndex[key] == null;      }      const definedKeys = Object.keys(options.collation);      const schemaCollation = options.collation;      const dbCollation = dbIndex.collation;      for (const opt of definedKeys) {        if (get(schemaCollation, opt) !== get(dbCollation, opt)) {          return false;        }      }    } else if (!utils.deepEqual(options[key], dbIndex[key])) {      return false;    }  }
  const schemaIndexKeys = Object.keys(schemaIndexKeysObject);  const dbIndexKeys = Object.keys(dbIndex.key);  if (schemaIndexKeys.length !== dbIndexKeys.length) {    return false;  }  for (let i = 0; i < schemaIndexKeys.length; ++i) {    if (schemaIndexKeys[i] !== dbIndexKeys[i]) {      return false;    }    if (!utils.deepEqual(schemaIndexKeysObject[schemaIndexKeys[i]], dbIndex.key[dbIndexKeys[i]])) {      return false;    }  }
  return true;};