<?php
declare(strict_types=1);

namespace Fendx\Common\Util;

class ArrayHelper
{
    public static function get(array $array, string $key, mixed $default = null): mixed
    {
        if ($key === '') {
            return $default;
        }
        
        $keys = explode('.', $key);
        $value = $array;
        
        foreach ($keys as $k) {
            if (!is_array($value) || !array_key_exists($k, $value)) {
                return $default;
            }
            $value = $value[$k];
        }
        
        return $value;
    }
    
    public static function set(array &$array, string $key, mixed $value): void
    {
        $keys = explode('.', $key);
        $current = &$array;
        
        foreach ($keys as $k) {
            if (!is_array($current)) {
                $current = [];
            }
            if (!array_key_exists($k, $current)) {
                $current[$k] = [];
            }
            $current = &$current[$k];
        }
        
        $current = $value;
    }
    
    public static function merge(array ...$arrays): array
    {
        $result = [];
        
        foreach ($arrays as $array) {
            foreach ($array as $key => $value) {
                if (is_int($key)) {
                    $result[] = $value;
                } elseif (isset($result[$key]) && is_array($result[$key]) && is_array($value)) {
                    $result[$key] = self::merge($result[$key], $value);
                } else {
                    $result[$key] = $value;
                }
            }
        }
        
        return $result;
    }
}