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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 isLayout = require( '@stdlib/blas/base/assert/is-layout' );
var isRowMajor = require( '@stdlib/ndarray/base/assert/is-row-major-string' );
var isColumnMajor = require( '@stdlib/ndarray/base/assert/is-column-major-string' );
var stride2offset = require( '@stdlib/strided/base/stride2offset' );
var max = require( '@stdlib/math/base/special/fast/max' );
var format = require( '@stdlib/string/format' );
var ndarray = require( './ndarray.js' );
// MAIN //
/**
* Returns the index of the n-th row in an input matrix which has the same elements as a provided search vector.
*
* ## Notes
*
* - If the function is provided an empty matrix, if `k` is less than or equal to zero, or if the function is unable to find the n-th matching row, the function returns `-1` (i.e., an invalid index).
* - The `workspace` array is only applicable when an input matrix is stored in column-major order. When the matrix is stored in row-major order, the workspace array is ignored.
*
* @param {string} order - storage layout
* @param {PositiveInteger} M - number of rows in `A`
* @param {PositiveInteger} N - number of columns in `A`
* @param {PositiveInteger} k - occurrence number
* @param {Collection} A - input matrix
* @param {integer} LDA - stride length for the first dimension of `A` (a.k.a., leading dimension of the matrix `A`)
* @param {Collection} x - search vector
* @param {integer} strideX - stride length for `x`
* @param {Collection} workspace - workspace array for tracking row match candidates
* @param {integer} strideW - stride length for `workspace`
* @throws {TypeError} first argument must be a valid order
* @throws {RangeError} sixth argument must be a valid stride
* @returns {integer} row index
*
* @example
* var A = [ 1.0, 2.0, 3.0, 4.0, 3.0, 4.0, 0.0, 0.0 ]; // => [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 3.0, 4.0 ], [ 0.0, 0.0 ] ]
* var x = [ 3.0, 4.0 ];
* var workspace = [ 0, 0, 0, 0 ];
*
* var out = gnthIndexOfRow( 'row-major', 4, 2, 2, A, 2, x, 1, workspace, 1 );
* // returns 2
*/
function gnthIndexOfRow( order, M, N, k, A, LDA, x, strideX, workspace, strideW ) { // eslint-disable-line max-len
var sa1;
var sa2;
var s;
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( isRowMajor( order ) ) {
s = N;
} else {
s = M;
}
if ( LDA < max( 1, s ) ) {
throw new RangeError( format( 'invalid argument. Sixth argument must be greater than or equal to max(1,%d). Value: `%d`.', s, LDA ) );
}
if ( isColumnMajor( order ) ) {
sa1 = 1;
sa2 = LDA;
} else { // order === 'row-major'
sa1 = LDA;
sa2 = 1;
}
return ndarray( M, N, k, A, sa1, sa2, 0, x, strideX, stride2offset( N, strideX ), workspace, strideW, stride2offset( M, strideW ) ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = gnthIndexOfRow;
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