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* @license Apache-2.0
*
* Copyright (c) 2026 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 min = require( '@stdlib/math/base/special/fast/min' );
var zcopy = require( '@stdlib/blas/base/zcopy' ).ndarray;
// MAIN //
/**
* Performs an in-place copy of elements within a double-precision complex floating-point strided array.
*
* ## Notes
*
* - If the `start` and `target` index ranges do not overlap, the `workspace` array is unused and thus ignored.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {NonNegativeInteger} target - target index
* @param {NonNegativeInteger} start - source start index (inclusive)
* @param {NonNegativeInteger} end - source end index (exclusive)
* @param {Complex128Array} x - input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Complex128Array} workspace - workspace array
* @param {integer} strideW - stride length for `workspace`
* @param {NonNegativeInteger} offsetW - starting index for `workspace`
* @returns {Complex128Array} input array
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
*
* var x = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 ] );
* var w = new Complex128Array( x.length );
*
* zcopyWithin( x.length, 2, 0, 2, x, 1, 0, w, 1, 0 );
* // x => <Complex128Array>[ 1.0, 2.0, 3.0, 4.0, 1.0, 2.0, 3.0, 4.0 ]
*/
function zcopyWithin( N, target, start, end, x, strideX, offsetX, workspace, strideW, offsetW ) { // eslint-disable-line max-len
var ssi;
var tsi;
var cl;
if ( N <= 0 || strideX === 0 || target >= N ) {
return x;
}
// Resolve the number of elements to copy:
cl = min( min( end, N ) - start, N - target );
if ( cl <= 0 ) {
return x;
}
// Resolve the starting source and target indices...
ssi = offsetX + ( start * strideX );
tsi = offsetX + ( target * strideX );
// When the source and target index ranges overlap, copying directly could overwrite source elements before they are read, and, thus, we first copy the source elements to a workspace array:
if ( start < target+cl && target < start+cl ) {
zcopy( cl, x, strideX, ssi, workspace, strideW, offsetW );
zcopy( cl, workspace, strideW, offsetW, x, strideX, tsi );
return x;
}
zcopy( cl, x, strideX, ssi, x, strideX, tsi );
return x;
}
// EXPORTS //
module.exports = zcopyWithin;
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