/**
* @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 isBuffer = require( './../../is-buffer' );
var GlobalBuffer = require( './buffer.js' );


// MAIN //

/**
* Tests for native `Buffer` support.
*
* @returns {boolean} boolean indicating if an environment has `Buffer` support
*
* @example
* var bool = hasNodeBufferSupport();
* // returns <boolean>
*/
function hasNodeBufferSupport() {
	var bool;
	var b;

	if ( typeof GlobalBuffer !== 'function' ) {
		return false;
	}
	// Test basic support...
	try {
		if ( typeof GlobalBuffer.from === 'function' ) {
			b = GlobalBuffer.from( [ 1, 2, 3, 4 ] );
		} else {
			b = new GlobalBuffer( [ 1, 2, 3, 4 ] ); // Note: this is deprecated behavior starting in Node v6 (see https://nodejs.org/api/buffer.html#buffer_new_buffer_array)
		}
		bool = (
			isBuffer( b ) &&
			b[ 0 ] === 1 &&
			b[ 1 ] === 2 &&
			b[ 2 ] === 3 &&
			b[ 3 ] === 4
		);
	} catch ( err ) { // eslint-disable-line no-unused-vars
		bool = false;
	}
	return bool;
}


// EXPORTS //

module.exports = hasNodeBufferSupport;