/**
 * Convert snake_case string to camelCase
 * @param {string} str - String in snake_case
 * @returns {string} String in camelCase
 */
function snakeToCamel(str) {
    return str.replace(/_([a-z])/g, (_, letter) => letter.toUpperCase());
}

/**
 * Convert all keys in an object from snake_case to camelCase
 * @param {Object} obj - Object with snake_case keys
 * @returns {Object} Object with camelCase keys
 */
function convertKeysToCamelCase(obj) {
    if (obj === null || typeof obj !== 'object') {
        return obj;
    }

    if (Array.isArray(obj)) {
        return obj.map(item => convertKeysToCamelCase(item));
    }

    const converted = {};
    for (const key in obj) {
        if (obj.hasOwnProperty(key)) {
            const camelKey = snakeToCamel(key);
            converted[camelKey] = convertKeysToCamelCase(obj[key]);
        }
    }
    return converted;
}

module.exports = {
    snakeToCamel,
    convertKeysToCamelCase
};