/**
* @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.
*/

/* eslint-disable no-new-wrappers */

'use strict';

// MODULES //

var tape = require( 'tape' );
var isEmptyString = require( '@stdlib/assert/is-empty-string' );
var porterStemmer = require( './../lib' );


// FIXTURES //

var words = require( './fixtures/words.json' );


// TESTS //

tape( 'main export is a function', function test( t ) {
	t.ok( true, __filename );
	t.equal( typeof porterStemmer, 'function', 'main export is a function' );
	t.end();
});

tape( 'if the first argument is not a string primitive, the function throws an error', function test( t ) {
	var values;
	var i;

	values = [
		new String( 'beep' ),
		5,
		null,
		true,
		void 0,
		NaN,
		[],
		{},
		function noop() {}
	];

	for ( i = 0; i < values.length; i++ ) {
		t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );
	}
	t.end();

	function badValue( value ) {
		return function badValue() {
			porterStemmer( value );
		};
	}
});

tape( 'the function stems an input string using the Porter stemming algorithm', function test( t ) {
	var expected;
	var actual;
	var i;

	for ( i = 0; i < words.original.length; i++ ) {
		expected = words.stemmed[ i ];
		actual = porterStemmer( words.original[ i ] );
		t.equal( actual, expected, 'returns the expected string' );
	}
	t.end();
});

tape( 'the function returns an empty string if provided an empty string', function test( t ) {
	var out = porterStemmer( '' );
	t.equal( isEmptyString( out ), true, 'returns an empty string' );
	t.end();
});
