/**
* @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 abs = require( '@stdlib/math/base/special/abs' );
var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );


// MAIN //

/**
* Computes the sum of absolute values.
*
* @param {PositiveInteger} N - number of values to sum
* @param {Float32Array} x - input array
* @param {integer} stride - `x` stride length
* @param {NonNegativeInteger} offset - starting `x` index
* @returns {number} sum
*
* @example
* var Float32Array = require( '@stdlib/array/float32' );
*
* var x = new Float32Array( [ 1.0, -2.0, 3.0, -4.0, 5.0 ] );
*
* var s = sasum( x.length, x, 1, 0 );
* // returns 15.0
*/
function sasum( N, x, stride, offset ) {
	var sum;
	var ix;
	var i;

	sum = 0.0;
	if ( N <= 0 ) {
		return sum;
	}
	ix = offset;
	for ( i = 0; i < N; i++ ) {
		sum = float64ToFloat32( sum + abs( x[ix] ) );
		ix += stride;
	}
	return sum;
}


// EXPORTS //

module.exports = sasum;