/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

// MODULES //

var getOwnPropertyNames = require( './../../property-names' );
var getPrototypeOf = require( './../../get-prototype-of' );


// FUNCTIONS //

/**
* Returns a boolean indicating if an array contains a provided value.
*
* @private
* @param {Array} arr - array
* @param {*} v - search value
* @returns {boolean} boolean indicating if an array contains a search value
*/
function contains( arr, v ) {
	var i;
	for ( i = 0; i < arr.length; i++ ) {
		if ( arr[ i ] === v ) {
			return true;
		}
	}
	return false;
}


// MAIN //

/**
* Returns an array of an object's own and inherited enumerable and non-enumerable property names.
*
* ## Notes
*
* -   In contrast to the built-in `Object.getOwnPropertyNames()`, this function returns an empty array if provided `undefined` or `null`, rather than throwing an error.
*
* @param {*} value - input object
* @returns {Array} a list of own and inherited property names
*
* @example
* var obj = {
*     'beep': 'boop',
*     'foo': 3.14
* };
*
* var keys = propertyNamesIn( obj );
* // e.g., returns [ 'beep', 'foo', ... ]
*/
function propertyNamesIn( value ) {
	var names;
	var obj;
	var tmp;
	var i;

	if ( value === null || value === void 0 ) {
		return [];
	}
	// Cast the value to an object:
	obj = Object( value );

	// Walk the prototype chain collecting all enumerable and non-enumerable property names...
	names = [];
	do {
		tmp = getOwnPropertyNames( obj );
		for ( i = 0; i < tmp.length; i++ ) {
			if ( contains( names, tmp[ i ] ) === false ) {
				names.push( tmp[ i ] );
			}
		}
		obj = getPrototypeOf( obj );
	} while ( obj );

	return names;
}


// EXPORTS //

module.exports = propertyNamesIn;