<?php
namespace App\Support;

class ApiDataTransformer
{
    /**
     * Convert array keys from snake_case to camelCase recursively
     */
    public static function snakeToCamel(array $data): array
    {
        $result = [];

        foreach ($data as $key => $value) {
            $camelKey = self::convertSnakeToCamel($key);

            if (is_array($value)) {
                $result[$camelKey] = self::snakeToCamel($value);
            } elseif (is_object($value)) {
                $result[$camelKey] = self::snakeToCamel((array)$value);
            } else {
                $result[$camelKey] = $value;
            }
        }

        return $result;
    }

    /**
     * Convert array keys from camelCase to snake_case recursively
     */
    public static function camelToSnake(array $data): array
    {
        $result = [];

        foreach ($data as $key => $value) {
            $snakeKey = self::convertCamelToSnake($key);

            if (is_array($value)) {
                $result[$snakeKey] = self::camelToSnake($value);
            } elseif (is_object($value)) {
                $result[$snakeKey] = self::camelToSnake((array)$value);
            } else {
                $result[$snakeKey] = $value;
            }
        }

        return $result;
    }

    /**
     * Convert a single string from snake_case to camelCase
     */
    protected static function convertSnakeToCamel(string $string): string
    {
        return lcfirst(str_replace(' ', '', ucwords(str_replace('_', ' ', $string))));
    }

    /**
     * Convert a single string from camelCase to snake_case
     */
    protected static function convertCamelToSnake(string $string): string
    {
        return strtolower(preg_replace('/(?<!^)[A-Z]/', '_$0', $string));
    }
}