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1<?php
2/**
3 * Pop PHP Framework (http://www.popphp.org/)
4 *
5 * @link       https://github.com/popphp/popphp-framework
6 * @author     Nick Sagona, III <dev@noladev.com>
7 * @copyright  Copyright (c) 2009-2025 NOLA Interactive, LLC.
8 * @license    http://www.popphp.org/license     New BSD License
9 */
10
11/**
12 * @namespace
13 */
14namespace Pop\Validator;
15
16/**
17 * Has one validator class
18 *
19 * @category   Pop
20 * @package    Pop\Validator
21 * @author     Nick Sagona, III <dev@noladev.com>
22 * @copyright  Copyright (c) 2009-2025 NOLA Interactive, LLC.
23 * @license    http://www.popphp.org/license     New BSD License
24 * @version    4.5.0
25 */
26class HasOnlyOne extends AbstractValidator
27{
28
29    /**
30     * Traits
31     */
32    use TraverseTrait;
33
34    /**
35     * Method to evaluate the validator
36     *
37     * @param  mixed $input
38     * @throws Exception
39     * @return bool
40     */
41    public function evaluate(mixed $input = null): bool
42    {
43        // Set the input, if passed
44        if ($input !== null) {
45            $this->input = $input;
46        }
47
48        if (!is_array($input)) {
49            throw new Exception('Error: The evaluated input must be an array.');
50        }
51        if (empty($this->value)) {
52            throw new Exception('Error: The evaluated value cannot be empty.');
53        }
54
55        // Set the default message
56        if ($this->message === null) {
57            $this->message = 'The value must contain only one item' .
58                (($this->value !== null) ? " of '" . $this->value . "'." : '.');
59        }
60
61        if (!str_contains($this->value, '.')) {
62            return (array_key_exists($this->value, $this->input) &&
63                is_array($this->input[$this->value]) && count($this->input[$this->value]) == 1);
64        } else {
65            $value = [];
66            self::traverseData($this->value, $this->input, $value);
67            return (is_array($value) && (count($value) == 1));
68        }
69    }
70
71}