/**
* @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 isUint16Array = require( './../../is-uint16array' );
var UINT16_MAX = require( '@stdlib/constants/uint16/max' );
var GlobalUint16Array = require( './uint16array.js' );


// MAIN //

/**
* Tests for native `Uint16Array` support.
*
* @returns {boolean} boolean indicating if an environment has `Uint16Array` support
*
* @example
* var bool = hasUint16ArraySupport();
* // returns <boolean>
*/
function hasUint16ArraySupport() {
	var bool;
	var arr;

	if ( typeof GlobalUint16Array !== 'function' ) {
		return false;
	}
	// Test basic support...
	try {
		arr = [ 1, 3.14, -3.14, UINT16_MAX+1, UINT16_MAX+2 ];
		arr = new GlobalUint16Array( arr );
		bool = (
			isUint16Array( arr ) &&
			arr[ 0 ] === 1 &&
			arr[ 1 ] === 3 &&            // truncation
			arr[ 2 ] === UINT16_MAX-2 && // truncation and wrap around
			arr[ 3 ] === 0 &&            // wrap around
			arr[ 4 ] === 1               // wrap around
		);
	} catch ( err ) { // eslint-disable-line no-unused-vars
		bool = false;
	}
	return bool;
}


// EXPORTS //

module.exports = hasUint16ArraySupport;