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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 discreteUniform = require( '@stdlib/random/base/discrete-uniform' ).factory;
var uniform = require( '@stdlib/random/base/uniform' ).factory;
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isObject = require( '@stdlib/assert/is-plain-object' );
var isFunction = require( '@stdlib/assert/is-function' );
var format = require( '@stdlib/string/format' );
var FLOAT64_EPS = require( '@stdlib/constants/float64/eps' );
var INT32_MAX = require( '@stdlib/constants/int32/max' );
// MAIN //
/**
* Returns pseudorandom number generators for performing k-means++ initialization.
*
* ## Notes
*
* - The returned array contains the following pseudorandom number generators:
*
* - **0**: a function for generating uniformly distributed pseudorandom integers on a closed interval.
* - **1**: a function for generating uniformly distributed pseudorandom numbers on the half-open interval `[0,1)`.
*
* @private
* @param {boolean} hasOptions - boolean indicating whether to process an options argument
* @param {Options} [options] - function options
* @param {PRNG} [options.prng] - pseudorandom number generator which generates uniformly distributed pseudorandom numbers
* @param {PRNGSeedMT19937} [options.seed] - pseudorandom number generator seed
* @param {PRNGStateMT19937} [options.state] - pseudorandom number generator state
* @param {boolean} [options.copy=true] - boolean indicating whether to copy a provided pseudorandom number generator state
* @throws {TypeError} options argument must be an object
* @throws {TypeError} options.prng must be a pseudorandom number generator function
* @returns {Array<Function>} array of pseudorandom number generators
*/
function prng( hasOptions, options ) {
var randi;
var rand;
if ( hasOptions ) {
if ( !isObject( options ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
if ( hasOwnProp( options, 'prng' ) ) {
if ( !isFunction( options.prng ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be a pseudorandom number generator function. Option: `%s`.', 'prng', options.prng ) );
}
randi = discreteUniform( options );
rand = uniform( 0.0, 1.0-FLOAT64_EPS, {
'prng': options.prng.normalized
});
} else if ( hasOwnProp( options, 'seed' ) ) {
randi = discreteUniform( options );
rand = uniform( 0.0, 1.0-FLOAT64_EPS, {
'seed': randi( 1, INT32_MAX )
});
} else {
randi = discreteUniform( options );
rand = uniform( 0.0, 1.0-FLOAT64_EPS, options );
}
} else {
randi = discreteUniform();
rand = uniform( 0.0, 1.0-FLOAT64_EPS );
}
return [ randi, rand ];
}
// EXPORTS //
module.exports = prng;
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