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'use strict';const modifiedPaths = require('./common').modifiedPaths;const get = require('./get');
/** * Applies defaults to update and findOneAndUpdate operations. * * @param {Object} filter * @param {Schema} schema * @param {Object} castedDoc * @param {Object} options * @method setDefaultsOnInsert * @api private */
module.exports = function(filter, schema, castedDoc, options) {  options = options || {};
  const shouldSetDefaultsOnInsert =    options.setDefaultsOnInsert != null ?      options.setDefaultsOnInsert :      schema.base.options.setDefaultsOnInsert;
  if (!options.upsert || shouldSetDefaultsOnInsert === false) {    return castedDoc;  }
  const keys = Object.keys(castedDoc || {});  const updatedKeys = {};  const updatedValues = {};  const numKeys = keys.length;  const modified = {};
  let hasDollarUpdate = false;
  for (let i = 0; i < numKeys; ++i) {    if (keys[i].startsWith('$')) {      modifiedPaths(castedDoc[keys[i]], '', modified);      hasDollarUpdate = true;    }  }
  if (!hasDollarUpdate) {    modifiedPaths(castedDoc, '', modified);  }
  const paths = Object.keys(filter);  const numPaths = paths.length;  for (let i = 0; i < numPaths; ++i) {    const path = paths[i];    const condition = filter[path];    if (condition && typeof condition === 'object') {      const conditionKeys = Object.keys(condition);      const numConditionKeys = conditionKeys.length;      let hasDollarKey = false;      for (let j = 0; j < numConditionKeys; ++j) {        if (conditionKeys[j].startsWith('$')) {          hasDollarKey = true;          break;        }      }      if (hasDollarKey) {        continue;      }    }    updatedKeys[path] = true;    modified[path] = true;  }
  if (options && options.overwrite && !hasDollarUpdate) {    // Defaults will be set later, since we're overwriting we'll cast    // the whole update to a document    return castedDoc;  }
  schema.eachPath(function(path, schemaType) {    // Skip single nested paths if underneath a map    if (schemaType.path === '_id' && schemaType.options.auto) {      return;    }    const def = schemaType.getDefault(null, true);    if (isModified(modified, path)) {      return;    }    if (typeof def === 'undefined') {      return;    }    if (schemaType.splitPath().includes('$*')) {      // Skip defaults underneath maps. We should never do `$setOnInsert` on a path with `$*`      return;    }
    castedDoc = castedDoc || {};    castedDoc.$setOnInsert = castedDoc.$setOnInsert || {};    if (get(castedDoc, path) == null) {      castedDoc.$setOnInsert[path] = def;    }    updatedValues[path] = def;  });
  return castedDoc;};
function isModified(modified, path) {  if (modified[path]) {    return true;  }
  // Is any parent path of `path` modified?  const sp = path.split('.');  let cur = sp[0];  for (let i = 1; i < sp.length; ++i) {    if (modified[cur]) {      return true;    }    cur += '.' + sp[i];  }
  // Is any child of `path` modified?  const modifiedKeys = Object.keys(modified);  if (modifiedKeys.length) {    const parentPath = path + '.';
    for (const modifiedPath of modifiedKeys) {      if (modifiedPath.slice(0, path.length + 1) === parentPath) {        return true;      }    }  }
  return false;}