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'use strict';
const hasIncludedChildren = require('./hasIncludedChildren');const isExclusive = require('./isExclusive');const isInclusive = require('./isInclusive');const isPOJO = require('../../utils').isPOJO;
module.exports = function applyProjection(doc, projection, _hasIncludedChildren) {  if (projection == null) {    return doc;  }  if (doc == null) {    return doc;  }
  let exclude = null;  if (isInclusive(projection)) {    exclude = false;  } else if (isExclusive(projection)) {    exclude = true;  }
  if (exclude == null) {    return doc;  } else if (exclude) {    _hasIncludedChildren = _hasIncludedChildren || hasIncludedChildren(projection);    return applyExclusiveProjection(doc, projection, _hasIncludedChildren);  } else {    _hasIncludedChildren = _hasIncludedChildren || hasIncludedChildren(projection);    return applyInclusiveProjection(doc, projection, _hasIncludedChildren);  }};
function applyExclusiveProjection(doc, projection, hasIncludedChildren, projectionLimb, prefix) {  if (doc == null || typeof doc !== 'object') {    return doc;  }  const ret = { ...doc };  projectionLimb = prefix ? (projectionLimb || {}) : projection;
  for (const key of Object.keys(ret)) {    const fullPath = prefix ? prefix + '.' + key : key;    if (projection.hasOwnProperty(fullPath) || projectionLimb.hasOwnProperty(key)) {      if (isPOJO(projection[fullPath]) || isPOJO(projectionLimb[key])) {        ret[key] = applyExclusiveProjection(ret[key], projection, hasIncludedChildren, projectionLimb[key], fullPath);      } else {        delete ret[key];      }    } else if (hasIncludedChildren[fullPath]) {      ret[key] = applyExclusiveProjection(ret[key], projection, hasIncludedChildren, projectionLimb[key], fullPath);    }  }  return ret;}
function applyInclusiveProjection(doc, projection, hasIncludedChildren, projectionLimb, prefix) {  if (doc == null || typeof doc !== 'object') {    return doc;  }  const ret = { ...doc };  projectionLimb = prefix ? (projectionLimb || {}) : projection;
  for (const key of Object.keys(ret)) {    const fullPath = prefix ? prefix + '.' + key : key;    if (projection.hasOwnProperty(fullPath) || projectionLimb.hasOwnProperty(key)) {      if (isPOJO(projection[fullPath]) || isPOJO(projectionLimb[key])) {        ret[key] = applyInclusiveProjection(ret[key], projection, hasIncludedChildren, projectionLimb[key], fullPath);      }      continue;    } else if (hasIncludedChildren[fullPath]) {      ret[key] = applyInclusiveProjection(ret[key], projection, hasIncludedChildren, projectionLimb[key], fullPath);    } else {      delete ret[key];    }  }  return ret;}